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7343 lines
183 KiB
7343 lines
183 KiB
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/* |
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rbd.c -- Export ceph rados objects as a Linux block device |
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based on drivers/block/osdblk.c: |
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Copyright 2009 Red Hat, Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; see the file COPYING. If not, write to |
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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For usage instructions, please refer to: |
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|
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Documentation/ABI/testing/sysfs-bus-rbd |
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*/ |
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#include <linux/ceph/libceph.h> |
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#include <linux/ceph/osd_client.h> |
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#include <linux/ceph/mon_client.h> |
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#include <linux/ceph/cls_lock_client.h> |
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#include <linux/ceph/striper.h> |
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#include <linux/ceph/decode.h> |
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#include <linux/fs_parser.h> |
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#include <linux/bsearch.h> |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/blk-mq.h> |
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#include <linux/fs.h> |
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#include <linux/blkdev.h> |
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#include <linux/slab.h> |
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#include <linux/idr.h> |
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#include <linux/workqueue.h> |
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#include "rbd_types.h" |
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#define RBD_DEBUG /* Activate rbd_assert() calls */ |
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/* |
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* Increment the given counter and return its updated value. |
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* If the counter is already 0 it will not be incremented. |
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* If the counter is already at its maximum value returns |
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* -EINVAL without updating it. |
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*/ |
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static int atomic_inc_return_safe(atomic_t *v) |
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{ |
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unsigned int counter; |
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counter = (unsigned int)atomic_fetch_add_unless(v, 1, 0); |
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if (counter <= (unsigned int)INT_MAX) |
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return (int)counter; |
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atomic_dec(v); |
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return -EINVAL; |
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} |
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/* Decrement the counter. Return the resulting value, or -EINVAL */ |
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static int atomic_dec_return_safe(atomic_t *v) |
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{ |
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int counter; |
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counter = atomic_dec_return(v); |
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if (counter >= 0) |
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return counter; |
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atomic_inc(v); |
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return -EINVAL; |
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} |
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#define RBD_DRV_NAME "rbd" |
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#define RBD_MINORS_PER_MAJOR 256 |
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#define RBD_SINGLE_MAJOR_PART_SHIFT 4 |
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#define RBD_MAX_PARENT_CHAIN_LEN 16 |
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#define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
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#define RBD_MAX_SNAP_NAME_LEN \ |
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(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) |
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#define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
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#define RBD_SNAP_HEAD_NAME "-" |
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#define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
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/* This allows a single page to hold an image name sent by OSD */ |
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#define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) |
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#define RBD_IMAGE_ID_LEN_MAX 64 |
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#define RBD_OBJ_PREFIX_LEN_MAX 64 |
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#define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
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#define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
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/* Feature bits */ |
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#define RBD_FEATURE_LAYERING (1ULL<<0) |
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#define RBD_FEATURE_STRIPINGV2 (1ULL<<1) |
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#define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) |
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#define RBD_FEATURE_OBJECT_MAP (1ULL<<3) |
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#define RBD_FEATURE_FAST_DIFF (1ULL<<4) |
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#define RBD_FEATURE_DEEP_FLATTEN (1ULL<<5) |
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#define RBD_FEATURE_DATA_POOL (1ULL<<7) |
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#define RBD_FEATURE_OPERATIONS (1ULL<<8) |
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#define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
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RBD_FEATURE_STRIPINGV2 | \ |
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RBD_FEATURE_EXCLUSIVE_LOCK | \ |
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RBD_FEATURE_OBJECT_MAP | \ |
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RBD_FEATURE_FAST_DIFF | \ |
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RBD_FEATURE_DEEP_FLATTEN | \ |
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RBD_FEATURE_DATA_POOL | \ |
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RBD_FEATURE_OPERATIONS) |
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/* Features supported by this (client software) implementation. */ |
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#define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
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/* |
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* An RBD device name will be "rbd#", where the "rbd" comes from |
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* RBD_DRV_NAME above, and # is a unique integer identifier. |
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*/ |
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#define DEV_NAME_LEN 32 |
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/* |
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* block device image metadata (in-memory version) |
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*/ |
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struct rbd_image_header { |
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/* These six fields never change for a given rbd image */ |
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char *object_prefix; |
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__u8 obj_order; |
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u64 stripe_unit; |
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u64 stripe_count; |
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s64 data_pool_id; |
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u64 features; /* Might be changeable someday? */ |
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/* The remaining fields need to be updated occasionally */ |
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u64 image_size; |
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struct ceph_snap_context *snapc; |
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char *snap_names; /* format 1 only */ |
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u64 *snap_sizes; /* format 1 only */ |
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}; |
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/* |
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* An rbd image specification. |
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* |
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* The tuple (pool_id, image_id, snap_id) is sufficient to uniquely |
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* identify an image. Each rbd_dev structure includes a pointer to |
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* an rbd_spec structure that encapsulates this identity. |
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* |
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* Each of the id's in an rbd_spec has an associated name. For a |
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* user-mapped image, the names are supplied and the id's associated |
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* with them are looked up. For a layered image, a parent image is |
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* defined by the tuple, and the names are looked up. |
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* |
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* An rbd_dev structure contains a parent_spec pointer which is |
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* non-null if the image it represents is a child in a layered |
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* image. This pointer will refer to the rbd_spec structure used |
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* by the parent rbd_dev for its own identity (i.e., the structure |
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* is shared between the parent and child). |
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* |
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* Since these structures are populated once, during the discovery |
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* phase of image construction, they are effectively immutable so |
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* we make no effort to synchronize access to them. |
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* |
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* Note that code herein does not assume the image name is known (it |
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* could be a null pointer). |
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*/ |
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struct rbd_spec { |
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u64 pool_id; |
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const char *pool_name; |
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const char *pool_ns; /* NULL if default, never "" */ |
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const char *image_id; |
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const char *image_name; |
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u64 snap_id; |
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const char *snap_name; |
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struct kref kref; |
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}; |
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/* |
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* an instance of the client. multiple devices may share an rbd client. |
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*/ |
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struct rbd_client { |
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struct ceph_client *client; |
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struct kref kref; |
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struct list_head node; |
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}; |
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struct pending_result { |
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int result; /* first nonzero result */ |
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int num_pending; |
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}; |
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struct rbd_img_request; |
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enum obj_request_type { |
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OBJ_REQUEST_NODATA = 1, |
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OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
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OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
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OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
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}; |
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enum obj_operation_type { |
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OBJ_OP_READ = 1, |
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OBJ_OP_WRITE, |
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OBJ_OP_DISCARD, |
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OBJ_OP_ZEROOUT, |
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}; |
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#define RBD_OBJ_FLAG_DELETION (1U << 0) |
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#define RBD_OBJ_FLAG_COPYUP_ENABLED (1U << 1) |
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#define RBD_OBJ_FLAG_COPYUP_ZEROS (1U << 2) |
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#define RBD_OBJ_FLAG_MAY_EXIST (1U << 3) |
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#define RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT (1U << 4) |
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enum rbd_obj_read_state { |
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RBD_OBJ_READ_START = 1, |
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RBD_OBJ_READ_OBJECT, |
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RBD_OBJ_READ_PARENT, |
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}; |
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/* |
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* Writes go through the following state machine to deal with |
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* layering: |
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* |
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* . . . . . RBD_OBJ_WRITE_GUARD. . . . . . . . . . . . . . |
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* . | . |
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* . v . |
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* . RBD_OBJ_WRITE_READ_FROM_PARENT. . . . |
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* . | . . |
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* . v v (deep-copyup . |
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* (image . RBD_OBJ_WRITE_COPYUP_EMPTY_SNAPC . not needed) . |
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* flattened) v | . . |
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* . v . . |
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* . . . .RBD_OBJ_WRITE_COPYUP_OPS. . . . . (copyup . |
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* | not needed) v |
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* v . |
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* done . . . . . . . . . . . . . . . . . . |
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* ^ |
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* | |
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* RBD_OBJ_WRITE_FLAT |
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* |
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* Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether |
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* assert_exists guard is needed or not (in some cases it's not needed |
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* even if there is a parent). |
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*/ |
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enum rbd_obj_write_state { |
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RBD_OBJ_WRITE_START = 1, |
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RBD_OBJ_WRITE_PRE_OBJECT_MAP, |
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RBD_OBJ_WRITE_OBJECT, |
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__RBD_OBJ_WRITE_COPYUP, |
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RBD_OBJ_WRITE_COPYUP, |
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RBD_OBJ_WRITE_POST_OBJECT_MAP, |
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}; |
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enum rbd_obj_copyup_state { |
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RBD_OBJ_COPYUP_START = 1, |
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RBD_OBJ_COPYUP_READ_PARENT, |
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__RBD_OBJ_COPYUP_OBJECT_MAPS, |
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RBD_OBJ_COPYUP_OBJECT_MAPS, |
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__RBD_OBJ_COPYUP_WRITE_OBJECT, |
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RBD_OBJ_COPYUP_WRITE_OBJECT, |
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}; |
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struct rbd_obj_request { |
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struct ceph_object_extent ex; |
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unsigned int flags; /* RBD_OBJ_FLAG_* */ |
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union { |
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enum rbd_obj_read_state read_state; /* for reads */ |
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enum rbd_obj_write_state write_state; /* for writes */ |
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}; |
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struct rbd_img_request *img_request; |
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struct ceph_file_extent *img_extents; |
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u32 num_img_extents; |
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union { |
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struct ceph_bio_iter bio_pos; |
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struct { |
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struct ceph_bvec_iter bvec_pos; |
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u32 bvec_count; |
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u32 bvec_idx; |
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}; |
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}; |
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enum rbd_obj_copyup_state copyup_state; |
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struct bio_vec *copyup_bvecs; |
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u32 copyup_bvec_count; |
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struct list_head osd_reqs; /* w/ r_private_item */ |
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struct mutex state_mutex; |
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struct pending_result pending; |
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struct kref kref; |
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}; |
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enum img_req_flags { |
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IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
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IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
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}; |
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enum rbd_img_state { |
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RBD_IMG_START = 1, |
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RBD_IMG_EXCLUSIVE_LOCK, |
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__RBD_IMG_OBJECT_REQUESTS, |
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RBD_IMG_OBJECT_REQUESTS, |
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}; |
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struct rbd_img_request { |
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struct rbd_device *rbd_dev; |
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enum obj_operation_type op_type; |
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enum obj_request_type data_type; |
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unsigned long flags; |
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enum rbd_img_state state; |
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union { |
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u64 snap_id; /* for reads */ |
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struct ceph_snap_context *snapc; /* for writes */ |
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}; |
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struct rbd_obj_request *obj_request; /* obj req initiator */ |
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struct list_head lock_item; |
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struct list_head object_extents; /* obj_req.ex structs */ |
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struct mutex state_mutex; |
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struct pending_result pending; |
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struct work_struct work; |
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int work_result; |
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}; |
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#define for_each_obj_request(ireq, oreq) \ |
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list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
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#define for_each_obj_request_safe(ireq, oreq, n) \ |
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list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
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enum rbd_watch_state { |
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RBD_WATCH_STATE_UNREGISTERED, |
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RBD_WATCH_STATE_REGISTERED, |
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RBD_WATCH_STATE_ERROR, |
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}; |
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enum rbd_lock_state { |
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RBD_LOCK_STATE_UNLOCKED, |
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RBD_LOCK_STATE_LOCKED, |
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RBD_LOCK_STATE_RELEASING, |
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}; |
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/* WatchNotify::ClientId */ |
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struct rbd_client_id { |
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u64 gid; |
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u64 handle; |
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}; |
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struct rbd_mapping { |
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u64 size; |
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}; |
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/* |
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* a single device |
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*/ |
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struct rbd_device { |
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int dev_id; /* blkdev unique id */ |
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int major; /* blkdev assigned major */ |
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int minor; |
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struct gendisk *disk; /* blkdev's gendisk and rq */ |
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u32 image_format; /* Either 1 or 2 */ |
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struct rbd_client *rbd_client; |
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char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
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spinlock_t lock; /* queue, flags, open_count */ |
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struct rbd_image_header header; |
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unsigned long flags; /* possibly lock protected */ |
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struct rbd_spec *spec; |
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struct rbd_options *opts; |
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char *config_info; /* add{,_single_major} string */ |
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struct ceph_object_id header_oid; |
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struct ceph_object_locator header_oloc; |
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struct ceph_file_layout layout; /* used for all rbd requests */ |
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struct mutex watch_mutex; |
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enum rbd_watch_state watch_state; |
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struct ceph_osd_linger_request *watch_handle; |
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u64 watch_cookie; |
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struct delayed_work watch_dwork; |
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struct rw_semaphore lock_rwsem; |
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enum rbd_lock_state lock_state; |
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char lock_cookie[32]; |
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struct rbd_client_id owner_cid; |
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struct work_struct acquired_lock_work; |
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struct work_struct released_lock_work; |
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struct delayed_work lock_dwork; |
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struct work_struct unlock_work; |
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spinlock_t lock_lists_lock; |
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struct list_head acquiring_list; |
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struct list_head running_list; |
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struct completion acquire_wait; |
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int acquire_err; |
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struct completion releasing_wait; |
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spinlock_t object_map_lock; |
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u8 *object_map; |
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u64 object_map_size; /* in objects */ |
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u64 object_map_flags; |
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struct workqueue_struct *task_wq; |
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struct rbd_spec *parent_spec; |
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u64 parent_overlap; |
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atomic_t parent_ref; |
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struct rbd_device *parent; |
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/* Block layer tags. */ |
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struct blk_mq_tag_set tag_set; |
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/* protects updating the header */ |
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struct rw_semaphore header_rwsem; |
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struct rbd_mapping mapping; |
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struct list_head node; |
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/* sysfs related */ |
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struct device dev; |
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unsigned long open_count; /* protected by lock */ |
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}; |
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/* |
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* Flag bits for rbd_dev->flags: |
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* - REMOVING (which is coupled with rbd_dev->open_count) is protected |
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* by rbd_dev->lock |
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*/ |
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enum rbd_dev_flags { |
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RBD_DEV_FLAG_EXISTS, /* rbd_dev_device_setup() ran */ |
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RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
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RBD_DEV_FLAG_READONLY, /* -o ro or snapshot */ |
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}; |
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static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
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static LIST_HEAD(rbd_dev_list); /* devices */ |
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static DEFINE_SPINLOCK(rbd_dev_list_lock); |
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static LIST_HEAD(rbd_client_list); /* clients */ |
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static DEFINE_SPINLOCK(rbd_client_list_lock); |
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|
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/* Slab caches for frequently-allocated structures */ |
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static struct kmem_cache *rbd_img_request_cache; |
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static struct kmem_cache *rbd_obj_request_cache; |
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static int rbd_major; |
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static DEFINE_IDA(rbd_dev_id_ida); |
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|
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static struct workqueue_struct *rbd_wq; |
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static struct ceph_snap_context rbd_empty_snapc = { |
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.nref = REFCOUNT_INIT(1), |
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}; |
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|
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/* |
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* single-major requires >= 0.75 version of userspace rbd utility. |
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*/ |
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static bool single_major = true; |
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module_param(single_major, bool, 0444); |
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MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
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|
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static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count); |
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static ssize_t remove_store(struct bus_type *bus, const char *buf, |
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size_t count); |
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static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, |
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size_t count); |
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static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, |
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size_t count); |
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static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
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|
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static int rbd_dev_id_to_minor(int dev_id) |
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{ |
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return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
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} |
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|
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static int minor_to_rbd_dev_id(int minor) |
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{ |
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return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
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} |
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static bool rbd_is_ro(struct rbd_device *rbd_dev) |
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{ |
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return test_bit(RBD_DEV_FLAG_READONLY, &rbd_dev->flags); |
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} |
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|
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static bool rbd_is_snap(struct rbd_device *rbd_dev) |
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{ |
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return rbd_dev->spec->snap_id != CEPH_NOSNAP; |
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} |
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|
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static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
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{ |
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lockdep_assert_held(&rbd_dev->lock_rwsem); |
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|
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return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || |
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rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; |
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} |
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|
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static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) |
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{ |
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bool is_lock_owner; |
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|
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down_read(&rbd_dev->lock_rwsem); |
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is_lock_owner = __rbd_is_lock_owner(rbd_dev); |
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up_read(&rbd_dev->lock_rwsem); |
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return is_lock_owner; |
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} |
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|
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static ssize_t supported_features_show(struct bus_type *bus, char *buf) |
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{ |
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return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); |
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} |
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|
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static BUS_ATTR_WO(add); |
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static BUS_ATTR_WO(remove); |
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static BUS_ATTR_WO(add_single_major); |
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static BUS_ATTR_WO(remove_single_major); |
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static BUS_ATTR_RO(supported_features); |
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|
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static struct attribute *rbd_bus_attrs[] = { |
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&bus_attr_add.attr, |
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&bus_attr_remove.attr, |
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&bus_attr_add_single_major.attr, |
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&bus_attr_remove_single_major.attr, |
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&bus_attr_supported_features.attr, |
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NULL, |
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}; |
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|
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static umode_t rbd_bus_is_visible(struct kobject *kobj, |
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struct attribute *attr, int index) |
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{ |
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if (!single_major && |
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(attr == &bus_attr_add_single_major.attr || |
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attr == &bus_attr_remove_single_major.attr)) |
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return 0; |
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|
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return attr->mode; |
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} |
|
|
|
static const struct attribute_group rbd_bus_group = { |
|
.attrs = rbd_bus_attrs, |
|
.is_visible = rbd_bus_is_visible, |
|
}; |
|
__ATTRIBUTE_GROUPS(rbd_bus); |
|
|
|
static struct bus_type rbd_bus_type = { |
|
.name = "rbd", |
|
.bus_groups = rbd_bus_groups, |
|
}; |
|
|
|
static void rbd_root_dev_release(struct device *dev) |
|
{ |
|
} |
|
|
|
static struct device rbd_root_dev = { |
|
.init_name = "rbd", |
|
.release = rbd_root_dev_release, |
|
}; |
|
|
|
static __printf(2, 3) |
|
void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) |
|
{ |
|
struct va_format vaf; |
|
va_list args; |
|
|
|
va_start(args, fmt); |
|
vaf.fmt = fmt; |
|
vaf.va = &args; |
|
|
|
if (!rbd_dev) |
|
printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); |
|
else if (rbd_dev->disk) |
|
printk(KERN_WARNING "%s: %s: %pV\n", |
|
RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); |
|
else if (rbd_dev->spec && rbd_dev->spec->image_name) |
|
printk(KERN_WARNING "%s: image %s: %pV\n", |
|
RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); |
|
else if (rbd_dev->spec && rbd_dev->spec->image_id) |
|
printk(KERN_WARNING "%s: id %s: %pV\n", |
|
RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); |
|
else /* punt */ |
|
printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", |
|
RBD_DRV_NAME, rbd_dev, &vaf); |
|
va_end(args); |
|
} |
|
|
|
#ifdef RBD_DEBUG |
|
#define rbd_assert(expr) \ |
|
if (unlikely(!(expr))) { \ |
|
printk(KERN_ERR "\nAssertion failure in %s() " \ |
|
"at line %d:\n\n" \ |
|
"\trbd_assert(%s);\n\n", \ |
|
__func__, __LINE__, #expr); \ |
|
BUG(); \ |
|
} |
|
#else /* !RBD_DEBUG */ |
|
# define rbd_assert(expr) ((void) 0) |
|
#endif /* !RBD_DEBUG */ |
|
|
|
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
|
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
|
static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
|
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
|
u64 snap_id); |
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
|
u8 *order, u64 *snap_size); |
|
static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev); |
|
|
|
static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result); |
|
static void rbd_img_handle_request(struct rbd_img_request *img_req, int result); |
|
|
|
/* |
|
* Return true if nothing else is pending. |
|
*/ |
|
static bool pending_result_dec(struct pending_result *pending, int *result) |
|
{ |
|
rbd_assert(pending->num_pending > 0); |
|
|
|
if (*result && !pending->result) |
|
pending->result = *result; |
|
if (--pending->num_pending) |
|
return false; |
|
|
|
*result = pending->result; |
|
return true; |
|
} |
|
|
|
static int rbd_open(struct block_device *bdev, fmode_t mode) |
|
{ |
|
struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
|
bool removing = false; |
|
|
|
spin_lock_irq(&rbd_dev->lock); |
|
if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
|
removing = true; |
|
else |
|
rbd_dev->open_count++; |
|
spin_unlock_irq(&rbd_dev->lock); |
|
if (removing) |
|
return -ENOENT; |
|
|
|
(void) get_device(&rbd_dev->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void rbd_release(struct gendisk *disk, fmode_t mode) |
|
{ |
|
struct rbd_device *rbd_dev = disk->private_data; |
|
unsigned long open_count_before; |
|
|
|
spin_lock_irq(&rbd_dev->lock); |
|
open_count_before = rbd_dev->open_count--; |
|
spin_unlock_irq(&rbd_dev->lock); |
|
rbd_assert(open_count_before > 0); |
|
|
|
put_device(&rbd_dev->dev); |
|
} |
|
|
|
static const struct block_device_operations rbd_bd_ops = { |
|
.owner = THIS_MODULE, |
|
.open = rbd_open, |
|
.release = rbd_release, |
|
}; |
|
|
|
/* |
|
* Initialize an rbd client instance. Success or not, this function |
|
* consumes ceph_opts. Caller holds client_mutex. |
|
*/ |
|
static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
|
{ |
|
struct rbd_client *rbdc; |
|
int ret = -ENOMEM; |
|
|
|
dout("%s:\n", __func__); |
|
rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
|
if (!rbdc) |
|
goto out_opt; |
|
|
|
kref_init(&rbdc->kref); |
|
INIT_LIST_HEAD(&rbdc->node); |
|
|
|
rbdc->client = ceph_create_client(ceph_opts, rbdc); |
|
if (IS_ERR(rbdc->client)) |
|
goto out_rbdc; |
|
ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
|
|
|
ret = ceph_open_session(rbdc->client); |
|
if (ret < 0) |
|
goto out_client; |
|
|
|
spin_lock(&rbd_client_list_lock); |
|
list_add_tail(&rbdc->node, &rbd_client_list); |
|
spin_unlock(&rbd_client_list_lock); |
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc); |
|
|
|
return rbdc; |
|
out_client: |
|
ceph_destroy_client(rbdc->client); |
|
out_rbdc: |
|
kfree(rbdc); |
|
out_opt: |
|
if (ceph_opts) |
|
ceph_destroy_options(ceph_opts); |
|
dout("%s: error %d\n", __func__, ret); |
|
|
|
return ERR_PTR(ret); |
|
} |
|
|
|
static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
|
{ |
|
kref_get(&rbdc->kref); |
|
|
|
return rbdc; |
|
} |
|
|
|
/* |
|
* Find a ceph client with specific addr and configuration. If |
|
* found, bump its reference count. |
|
*/ |
|
static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
|
{ |
|
struct rbd_client *client_node; |
|
bool found = false; |
|
|
|
if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
|
return NULL; |
|
|
|
spin_lock(&rbd_client_list_lock); |
|
list_for_each_entry(client_node, &rbd_client_list, node) { |
|
if (!ceph_compare_options(ceph_opts, client_node->client)) { |
|
__rbd_get_client(client_node); |
|
|
|
found = true; |
|
break; |
|
} |
|
} |
|
spin_unlock(&rbd_client_list_lock); |
|
|
|
return found ? client_node : NULL; |
|
} |
|
|
|
/* |
|
* (Per device) rbd map options |
|
*/ |
|
enum { |
|
Opt_queue_depth, |
|
Opt_alloc_size, |
|
Opt_lock_timeout, |
|
/* int args above */ |
|
Opt_pool_ns, |
|
Opt_compression_hint, |
|
/* string args above */ |
|
Opt_read_only, |
|
Opt_read_write, |
|
Opt_lock_on_read, |
|
Opt_exclusive, |
|
Opt_notrim, |
|
}; |
|
|
|
enum { |
|
Opt_compression_hint_none, |
|
Opt_compression_hint_compressible, |
|
Opt_compression_hint_incompressible, |
|
}; |
|
|
|
static const struct constant_table rbd_param_compression_hint[] = { |
|
{"none", Opt_compression_hint_none}, |
|
{"compressible", Opt_compression_hint_compressible}, |
|
{"incompressible", Opt_compression_hint_incompressible}, |
|
{} |
|
}; |
|
|
|
static const struct fs_parameter_spec rbd_parameters[] = { |
|
fsparam_u32 ("alloc_size", Opt_alloc_size), |
|
fsparam_enum ("compression_hint", Opt_compression_hint, |
|
rbd_param_compression_hint), |
|
fsparam_flag ("exclusive", Opt_exclusive), |
|
fsparam_flag ("lock_on_read", Opt_lock_on_read), |
|
fsparam_u32 ("lock_timeout", Opt_lock_timeout), |
|
fsparam_flag ("notrim", Opt_notrim), |
|
fsparam_string ("_pool_ns", Opt_pool_ns), |
|
fsparam_u32 ("queue_depth", Opt_queue_depth), |
|
fsparam_flag ("read_only", Opt_read_only), |
|
fsparam_flag ("read_write", Opt_read_write), |
|
fsparam_flag ("ro", Opt_read_only), |
|
fsparam_flag ("rw", Opt_read_write), |
|
{} |
|
}; |
|
|
|
struct rbd_options { |
|
int queue_depth; |
|
int alloc_size; |
|
unsigned long lock_timeout; |
|
bool read_only; |
|
bool lock_on_read; |
|
bool exclusive; |
|
bool trim; |
|
|
|
u32 alloc_hint_flags; /* CEPH_OSD_OP_ALLOC_HINT_FLAG_* */ |
|
}; |
|
|
|
#define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
|
#define RBD_ALLOC_SIZE_DEFAULT (64 * 1024) |
|
#define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
|
#define RBD_READ_ONLY_DEFAULT false |
|
#define RBD_LOCK_ON_READ_DEFAULT false |
|
#define RBD_EXCLUSIVE_DEFAULT false |
|
#define RBD_TRIM_DEFAULT true |
|
|
|
struct rbd_parse_opts_ctx { |
|
struct rbd_spec *spec; |
|
struct ceph_options *copts; |
|
struct rbd_options *opts; |
|
}; |
|
|
|
static char* obj_op_name(enum obj_operation_type op_type) |
|
{ |
|
switch (op_type) { |
|
case OBJ_OP_READ: |
|
return "read"; |
|
case OBJ_OP_WRITE: |
|
return "write"; |
|
case OBJ_OP_DISCARD: |
|
return "discard"; |
|
case OBJ_OP_ZEROOUT: |
|
return "zeroout"; |
|
default: |
|
return "???"; |
|
} |
|
} |
|
|
|
/* |
|
* Destroy ceph client |
|
* |
|
* Caller must hold rbd_client_list_lock. |
|
*/ |
|
static void rbd_client_release(struct kref *kref) |
|
{ |
|
struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc); |
|
spin_lock(&rbd_client_list_lock); |
|
list_del(&rbdc->node); |
|
spin_unlock(&rbd_client_list_lock); |
|
|
|
ceph_destroy_client(rbdc->client); |
|
kfree(rbdc); |
|
} |
|
|
|
/* |
|
* Drop reference to ceph client node. If it's not referenced anymore, release |
|
* it. |
|
*/ |
|
static void rbd_put_client(struct rbd_client *rbdc) |
|
{ |
|
if (rbdc) |
|
kref_put(&rbdc->kref, rbd_client_release); |
|
} |
|
|
|
/* |
|
* Get a ceph client with specific addr and configuration, if one does |
|
* not exist create it. Either way, ceph_opts is consumed by this |
|
* function. |
|
*/ |
|
static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
|
{ |
|
struct rbd_client *rbdc; |
|
int ret; |
|
|
|
mutex_lock(&client_mutex); |
|
rbdc = rbd_client_find(ceph_opts); |
|
if (rbdc) { |
|
ceph_destroy_options(ceph_opts); |
|
|
|
/* |
|
* Using an existing client. Make sure ->pg_pools is up to |
|
* date before we look up the pool id in do_rbd_add(). |
|
*/ |
|
ret = ceph_wait_for_latest_osdmap(rbdc->client, |
|
rbdc->client->options->mount_timeout); |
|
if (ret) { |
|
rbd_warn(NULL, "failed to get latest osdmap: %d", ret); |
|
rbd_put_client(rbdc); |
|
rbdc = ERR_PTR(ret); |
|
} |
|
} else { |
|
rbdc = rbd_client_create(ceph_opts); |
|
} |
|
mutex_unlock(&client_mutex); |
|
|
|
return rbdc; |
|
} |
|
|
|
static bool rbd_image_format_valid(u32 image_format) |
|
{ |
|
return image_format == 1 || image_format == 2; |
|
} |
|
|
|
static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
|
{ |
|
size_t size; |
|
u32 snap_count; |
|
|
|
/* The header has to start with the magic rbd header text */ |
|
if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) |
|
return false; |
|
|
|
/* The bio layer requires at least sector-sized I/O */ |
|
|
|
if (ondisk->options.order < SECTOR_SHIFT) |
|
return false; |
|
|
|
/* If we use u64 in a few spots we may be able to loosen this */ |
|
|
|
if (ondisk->options.order > 8 * sizeof (int) - 1) |
|
return false; |
|
|
|
/* |
|
* The size of a snapshot header has to fit in a size_t, and |
|
* that limits the number of snapshots. |
|
*/ |
|
snap_count = le32_to_cpu(ondisk->snap_count); |
|
size = SIZE_MAX - sizeof (struct ceph_snap_context); |
|
if (snap_count > size / sizeof (__le64)) |
|
return false; |
|
|
|
/* |
|
* Not only that, but the size of the entire the snapshot |
|
* header must also be representable in a size_t. |
|
*/ |
|
size -= snap_count * sizeof (__le64); |
|
if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/* |
|
* returns the size of an object in the image |
|
*/ |
|
static u32 rbd_obj_bytes(struct rbd_image_header *header) |
|
{ |
|
return 1U << header->obj_order; |
|
} |
|
|
|
static void rbd_init_layout(struct rbd_device *rbd_dev) |
|
{ |
|
if (rbd_dev->header.stripe_unit == 0 || |
|
rbd_dev->header.stripe_count == 0) { |
|
rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); |
|
rbd_dev->header.stripe_count = 1; |
|
} |
|
|
|
rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; |
|
rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; |
|
rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); |
|
rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
|
rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; |
|
RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
|
} |
|
|
|
/* |
|
* Fill an rbd image header with information from the given format 1 |
|
* on-disk header. |
|
*/ |
|
static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
|
struct rbd_image_header_ondisk *ondisk) |
|
{ |
|
struct rbd_image_header *header = &rbd_dev->header; |
|
bool first_time = header->object_prefix == NULL; |
|
struct ceph_snap_context *snapc; |
|
char *object_prefix = NULL; |
|
char *snap_names = NULL; |
|
u64 *snap_sizes = NULL; |
|
u32 snap_count; |
|
int ret = -ENOMEM; |
|
u32 i; |
|
|
|
/* Allocate this now to avoid having to handle failure below */ |
|
|
|
if (first_time) { |
|
object_prefix = kstrndup(ondisk->object_prefix, |
|
sizeof(ondisk->object_prefix), |
|
GFP_KERNEL); |
|
if (!object_prefix) |
|
return -ENOMEM; |
|
} |
|
|
|
/* Allocate the snapshot context and fill it in */ |
|
|
|
snap_count = le32_to_cpu(ondisk->snap_count); |
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
|
if (!snapc) |
|
goto out_err; |
|
snapc->seq = le64_to_cpu(ondisk->snap_seq); |
|
if (snap_count) { |
|
struct rbd_image_snap_ondisk *snaps; |
|
u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
|
|
|
/* We'll keep a copy of the snapshot names... */ |
|
|
|
if (snap_names_len > (u64)SIZE_MAX) |
|
goto out_2big; |
|
snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
|
if (!snap_names) |
|
goto out_err; |
|
|
|
/* ...as well as the array of their sizes. */ |
|
snap_sizes = kmalloc_array(snap_count, |
|
sizeof(*header->snap_sizes), |
|
GFP_KERNEL); |
|
if (!snap_sizes) |
|
goto out_err; |
|
|
|
/* |
|
* Copy the names, and fill in each snapshot's id |
|
* and size. |
|
* |
|
* Note that rbd_dev_v1_header_info() guarantees the |
|
* ondisk buffer we're working with has |
|
* snap_names_len bytes beyond the end of the |
|
* snapshot id array, this memcpy() is safe. |
|
*/ |
|
memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
|
snaps = ondisk->snaps; |
|
for (i = 0; i < snap_count; i++) { |
|
snapc->snaps[i] = le64_to_cpu(snaps[i].id); |
|
snap_sizes[i] = le64_to_cpu(snaps[i].image_size); |
|
} |
|
} |
|
|
|
/* We won't fail any more, fill in the header */ |
|
|
|
if (first_time) { |
|
header->object_prefix = object_prefix; |
|
header->obj_order = ondisk->options.order; |
|
rbd_init_layout(rbd_dev); |
|
} else { |
|
ceph_put_snap_context(header->snapc); |
|
kfree(header->snap_names); |
|
kfree(header->snap_sizes); |
|
} |
|
|
|
/* The remaining fields always get updated (when we refresh) */ |
|
|
|
header->image_size = le64_to_cpu(ondisk->image_size); |
|
header->snapc = snapc; |
|
header->snap_names = snap_names; |
|
header->snap_sizes = snap_sizes; |
|
|
|
return 0; |
|
out_2big: |
|
ret = -EIO; |
|
out_err: |
|
kfree(snap_sizes); |
|
kfree(snap_names); |
|
ceph_put_snap_context(snapc); |
|
kfree(object_prefix); |
|
|
|
return ret; |
|
} |
|
|
|
static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
|
{ |
|
const char *snap_name; |
|
|
|
rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
|
|
|
/* Skip over names until we find the one we are looking for */ |
|
|
|
snap_name = rbd_dev->header.snap_names; |
|
while (which--) |
|
snap_name += strlen(snap_name) + 1; |
|
|
|
return kstrdup(snap_name, GFP_KERNEL); |
|
} |
|
|
|
/* |
|
* Snapshot id comparison function for use with qsort()/bsearch(). |
|
* Note that result is for snapshots in *descending* order. |
|
*/ |
|
static int snapid_compare_reverse(const void *s1, const void *s2) |
|
{ |
|
u64 snap_id1 = *(u64 *)s1; |
|
u64 snap_id2 = *(u64 *)s2; |
|
|
|
if (snap_id1 < snap_id2) |
|
return 1; |
|
return snap_id1 == snap_id2 ? 0 : -1; |
|
} |
|
|
|
/* |
|
* Search a snapshot context to see if the given snapshot id is |
|
* present. |
|
* |
|
* Returns the position of the snapshot id in the array if it's found, |
|
* or BAD_SNAP_INDEX otherwise. |
|
* |
|
* Note: The snapshot array is in kept sorted (by the osd) in |
|
* reverse order, highest snapshot id first. |
|
*/ |
|
static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
|
{ |
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
|
u64 *found; |
|
|
|
found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
|
sizeof (snap_id), snapid_compare_reverse); |
|
|
|
return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
|
} |
|
|
|
static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
|
u64 snap_id) |
|
{ |
|
u32 which; |
|
const char *snap_name; |
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id); |
|
if (which == BAD_SNAP_INDEX) |
|
return ERR_PTR(-ENOENT); |
|
|
|
snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
|
return snap_name ? snap_name : ERR_PTR(-ENOMEM); |
|
} |
|
|
|
static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
|
{ |
|
if (snap_id == CEPH_NOSNAP) |
|
return RBD_SNAP_HEAD_NAME; |
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
|
if (rbd_dev->image_format == 1) |
|
return rbd_dev_v1_snap_name(rbd_dev, snap_id); |
|
|
|
return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
|
} |
|
|
|
static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
|
u64 *snap_size) |
|
{ |
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
|
if (snap_id == CEPH_NOSNAP) { |
|
*snap_size = rbd_dev->header.image_size; |
|
} else if (rbd_dev->image_format == 1) { |
|
u32 which; |
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id); |
|
if (which == BAD_SNAP_INDEX) |
|
return -ENOENT; |
|
|
|
*snap_size = rbd_dev->header.snap_sizes[which]; |
|
} else { |
|
u64 size = 0; |
|
int ret; |
|
|
|
ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
|
if (ret) |
|
return ret; |
|
|
|
*snap_size = size; |
|
} |
|
return 0; |
|
} |
|
|
|
static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
|
{ |
|
u64 snap_id = rbd_dev->spec->snap_id; |
|
u64 size = 0; |
|
int ret; |
|
|
|
ret = rbd_snap_size(rbd_dev, snap_id, &size); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_dev->mapping.size = size; |
|
return 0; |
|
} |
|
|
|
static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
|
{ |
|
rbd_dev->mapping.size = 0; |
|
} |
|
|
|
static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
|
{ |
|
struct ceph_bio_iter it = *bio_pos; |
|
|
|
ceph_bio_iter_advance(&it, off); |
|
ceph_bio_iter_advance_step(&it, bytes, ({ |
|
memzero_bvec(&bv); |
|
})); |
|
} |
|
|
|
static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
|
{ |
|
struct ceph_bvec_iter it = *bvec_pos; |
|
|
|
ceph_bvec_iter_advance(&it, off); |
|
ceph_bvec_iter_advance_step(&it, bytes, ({ |
|
memzero_bvec(&bv); |
|
})); |
|
} |
|
|
|
/* |
|
* Zero a range in @obj_req data buffer defined by a bio (list) or |
|
* (private) bio_vec array. |
|
* |
|
* @off is relative to the start of the data buffer. |
|
*/ |
|
static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
|
u32 bytes) |
|
{ |
|
dout("%s %p data buf %u~%u\n", __func__, obj_req, off, bytes); |
|
|
|
switch (obj_req->img_request->data_type) { |
|
case OBJ_REQUEST_BIO: |
|
zero_bios(&obj_req->bio_pos, off, bytes); |
|
break; |
|
case OBJ_REQUEST_BVECS: |
|
case OBJ_REQUEST_OWN_BVECS: |
|
zero_bvecs(&obj_req->bvec_pos, off, bytes); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static void rbd_obj_request_destroy(struct kref *kref); |
|
static void rbd_obj_request_put(struct rbd_obj_request *obj_request) |
|
{ |
|
rbd_assert(obj_request != NULL); |
|
dout("%s: obj %p (was %d)\n", __func__, obj_request, |
|
kref_read(&obj_request->kref)); |
|
kref_put(&obj_request->kref, rbd_obj_request_destroy); |
|
} |
|
|
|
static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
|
struct rbd_obj_request *obj_request) |
|
{ |
|
rbd_assert(obj_request->img_request == NULL); |
|
|
|
/* Image request now owns object's original reference */ |
|
obj_request->img_request = img_request; |
|
dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
|
} |
|
|
|
static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, |
|
struct rbd_obj_request *obj_request) |
|
{ |
|
dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
|
list_del(&obj_request->ex.oe_item); |
|
rbd_assert(obj_request->img_request == img_request); |
|
rbd_obj_request_put(obj_request); |
|
} |
|
|
|
static void rbd_osd_submit(struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
|
|
dout("%s osd_req %p for obj_req %p objno %llu %llu~%llu\n", |
|
__func__, osd_req, obj_req, obj_req->ex.oe_objno, |
|
obj_req->ex.oe_off, obj_req->ex.oe_len); |
|
ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
|
} |
|
|
|
/* |
|
* The default/initial value for all image request flags is 0. Each |
|
* is conditionally set to 1 at image request initialization time |
|
* and currently never change thereafter. |
|
*/ |
|
static void img_request_layered_set(struct rbd_img_request *img_request) |
|
{ |
|
set_bit(IMG_REQ_LAYERED, &img_request->flags); |
|
} |
|
|
|
static bool img_request_layered_test(struct rbd_img_request *img_request) |
|
{ |
|
return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; |
|
} |
|
|
|
static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
|
|
return !obj_req->ex.oe_off && |
|
obj_req->ex.oe_len == rbd_dev->layout.object_size; |
|
} |
|
|
|
static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
|
|
return obj_req->ex.oe_off + obj_req->ex.oe_len == |
|
rbd_dev->layout.object_size; |
|
} |
|
|
|
/* |
|
* Must be called after rbd_obj_calc_img_extents(). |
|
*/ |
|
static bool rbd_obj_copyup_enabled(struct rbd_obj_request *obj_req) |
|
{ |
|
if (!obj_req->num_img_extents || |
|
(rbd_obj_is_entire(obj_req) && |
|
!obj_req->img_request->snapc->num_snaps)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
|
{ |
|
return ceph_file_extents_bytes(obj_req->img_extents, |
|
obj_req->num_img_extents); |
|
} |
|
|
|
static bool rbd_img_is_write(struct rbd_img_request *img_req) |
|
{ |
|
switch (img_req->op_type) { |
|
case OBJ_OP_READ: |
|
return false; |
|
case OBJ_OP_WRITE: |
|
case OBJ_OP_DISCARD: |
|
case OBJ_OP_ZEROOUT: |
|
return true; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
int result; |
|
|
|
dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
|
osd_req->r_result, obj_req); |
|
|
|
/* |
|
* Writes aren't allowed to return a data payload. In some |
|
* guarded write cases (e.g. stat + zero on an empty object) |
|
* a stat response makes it through, but we don't care. |
|
*/ |
|
if (osd_req->r_result > 0 && rbd_img_is_write(obj_req->img_request)) |
|
result = 0; |
|
else |
|
result = osd_req->r_result; |
|
|
|
rbd_obj_handle_request(obj_req, result); |
|
} |
|
|
|
static void rbd_osd_format_read(struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_obj_request *obj_request = osd_req->r_priv; |
|
struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
|
struct ceph_options *opt = rbd_dev->rbd_client->client->options; |
|
|
|
osd_req->r_flags = CEPH_OSD_FLAG_READ | opt->read_from_replica; |
|
osd_req->r_snapid = obj_request->img_request->snap_id; |
|
} |
|
|
|
static void rbd_osd_format_write(struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_obj_request *obj_request = osd_req->r_priv; |
|
|
|
osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
|
ktime_get_real_ts64(&osd_req->r_mtime); |
|
osd_req->r_data_offset = obj_request->ex.oe_off; |
|
} |
|
|
|
static struct ceph_osd_request * |
|
__rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, |
|
struct ceph_snap_context *snapc, int num_ops) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct ceph_osd_request *req; |
|
const char *name_format = rbd_dev->image_format == 1 ? |
|
RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; |
|
int ret; |
|
|
|
req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO); |
|
if (!req) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
list_add_tail(&req->r_private_item, &obj_req->osd_reqs); |
|
req->r_callback = rbd_osd_req_callback; |
|
req->r_priv = obj_req; |
|
|
|
/* |
|
* Data objects may be stored in a separate pool, but always in |
|
* the same namespace in that pool as the header in its pool. |
|
*/ |
|
ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); |
|
req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
|
|
|
ret = ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
|
rbd_dev->header.object_prefix, |
|
obj_req->ex.oe_objno); |
|
if (ret) |
|
return ERR_PTR(ret); |
|
|
|
return req; |
|
} |
|
|
|
static struct ceph_osd_request * |
|
rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, int num_ops) |
|
{ |
|
return __rbd_obj_add_osd_request(obj_req, obj_req->img_request->snapc, |
|
num_ops); |
|
} |
|
|
|
static struct rbd_obj_request *rbd_obj_request_create(void) |
|
{ |
|
struct rbd_obj_request *obj_request; |
|
|
|
obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
|
if (!obj_request) |
|
return NULL; |
|
|
|
ceph_object_extent_init(&obj_request->ex); |
|
INIT_LIST_HEAD(&obj_request->osd_reqs); |
|
mutex_init(&obj_request->state_mutex); |
|
kref_init(&obj_request->kref); |
|
|
|
dout("%s %p\n", __func__, obj_request); |
|
return obj_request; |
|
} |
|
|
|
static void rbd_obj_request_destroy(struct kref *kref) |
|
{ |
|
struct rbd_obj_request *obj_request; |
|
struct ceph_osd_request *osd_req; |
|
u32 i; |
|
|
|
obj_request = container_of(kref, struct rbd_obj_request, kref); |
|
|
|
dout("%s: obj %p\n", __func__, obj_request); |
|
|
|
while (!list_empty(&obj_request->osd_reqs)) { |
|
osd_req = list_first_entry(&obj_request->osd_reqs, |
|
struct ceph_osd_request, r_private_item); |
|
list_del_init(&osd_req->r_private_item); |
|
ceph_osdc_put_request(osd_req); |
|
} |
|
|
|
switch (obj_request->img_request->data_type) { |
|
case OBJ_REQUEST_NODATA: |
|
case OBJ_REQUEST_BIO: |
|
case OBJ_REQUEST_BVECS: |
|
break; /* Nothing to do */ |
|
case OBJ_REQUEST_OWN_BVECS: |
|
kfree(obj_request->bvec_pos.bvecs); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
kfree(obj_request->img_extents); |
|
if (obj_request->copyup_bvecs) { |
|
for (i = 0; i < obj_request->copyup_bvec_count; i++) { |
|
if (obj_request->copyup_bvecs[i].bv_page) |
|
__free_page(obj_request->copyup_bvecs[i].bv_page); |
|
} |
|
kfree(obj_request->copyup_bvecs); |
|
} |
|
|
|
kmem_cache_free(rbd_obj_request_cache, obj_request); |
|
} |
|
|
|
/* It's OK to call this for a device with no parent */ |
|
|
|
static void rbd_spec_put(struct rbd_spec *spec); |
|
static void rbd_dev_unparent(struct rbd_device *rbd_dev) |
|
{ |
|
rbd_dev_remove_parent(rbd_dev); |
|
rbd_spec_put(rbd_dev->parent_spec); |
|
rbd_dev->parent_spec = NULL; |
|
rbd_dev->parent_overlap = 0; |
|
} |
|
|
|
/* |
|
* Parent image reference counting is used to determine when an |
|
* image's parent fields can be safely torn down--after there are no |
|
* more in-flight requests to the parent image. When the last |
|
* reference is dropped, cleaning them up is safe. |
|
*/ |
|
static void rbd_dev_parent_put(struct rbd_device *rbd_dev) |
|
{ |
|
int counter; |
|
|
|
if (!rbd_dev->parent_spec) |
|
return; |
|
|
|
counter = atomic_dec_return_safe(&rbd_dev->parent_ref); |
|
if (counter > 0) |
|
return; |
|
|
|
/* Last reference; clean up parent data structures */ |
|
|
|
if (!counter) |
|
rbd_dev_unparent(rbd_dev); |
|
else |
|
rbd_warn(rbd_dev, "parent reference underflow"); |
|
} |
|
|
|
/* |
|
* If an image has a non-zero parent overlap, get a reference to its |
|
* parent. |
|
* |
|
* Returns true if the rbd device has a parent with a non-zero |
|
* overlap and a reference for it was successfully taken, or |
|
* false otherwise. |
|
*/ |
|
static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) |
|
{ |
|
int counter = 0; |
|
|
|
if (!rbd_dev->parent_spec) |
|
return false; |
|
|
|
if (rbd_dev->parent_overlap) |
|
counter = atomic_inc_return_safe(&rbd_dev->parent_ref); |
|
|
|
if (counter < 0) |
|
rbd_warn(rbd_dev, "parent reference overflow"); |
|
|
|
return counter > 0; |
|
} |
|
|
|
static void rbd_img_request_init(struct rbd_img_request *img_request, |
|
struct rbd_device *rbd_dev, |
|
enum obj_operation_type op_type) |
|
{ |
|
memset(img_request, 0, sizeof(*img_request)); |
|
|
|
img_request->rbd_dev = rbd_dev; |
|
img_request->op_type = op_type; |
|
|
|
INIT_LIST_HEAD(&img_request->lock_item); |
|
INIT_LIST_HEAD(&img_request->object_extents); |
|
mutex_init(&img_request->state_mutex); |
|
} |
|
|
|
static void rbd_img_capture_header(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
|
|
lockdep_assert_held(&rbd_dev->header_rwsem); |
|
|
|
if (rbd_img_is_write(img_req)) |
|
img_req->snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
|
else |
|
img_req->snap_id = rbd_dev->spec->snap_id; |
|
|
|
if (rbd_dev_parent_get(rbd_dev)) |
|
img_request_layered_set(img_req); |
|
} |
|
|
|
static void rbd_img_request_destroy(struct rbd_img_request *img_request) |
|
{ |
|
struct rbd_obj_request *obj_request; |
|
struct rbd_obj_request *next_obj_request; |
|
|
|
dout("%s: img %p\n", __func__, img_request); |
|
|
|
WARN_ON(!list_empty(&img_request->lock_item)); |
|
for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
|
rbd_img_obj_request_del(img_request, obj_request); |
|
|
|
if (img_request_layered_test(img_request)) |
|
rbd_dev_parent_put(img_request->rbd_dev); |
|
|
|
if (rbd_img_is_write(img_request)) |
|
ceph_put_snap_context(img_request->snapc); |
|
|
|
if (test_bit(IMG_REQ_CHILD, &img_request->flags)) |
|
kmem_cache_free(rbd_img_request_cache, img_request); |
|
} |
|
|
|
#define BITS_PER_OBJ 2 |
|
#define OBJS_PER_BYTE (BITS_PER_BYTE / BITS_PER_OBJ) |
|
#define OBJ_MASK ((1 << BITS_PER_OBJ) - 1) |
|
|
|
static void __rbd_object_map_index(struct rbd_device *rbd_dev, u64 objno, |
|
u64 *index, u8 *shift) |
|
{ |
|
u32 off; |
|
|
|
rbd_assert(objno < rbd_dev->object_map_size); |
|
*index = div_u64_rem(objno, OBJS_PER_BYTE, &off); |
|
*shift = (OBJS_PER_BYTE - off - 1) * BITS_PER_OBJ; |
|
} |
|
|
|
static u8 __rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
|
{ |
|
u64 index; |
|
u8 shift; |
|
|
|
lockdep_assert_held(&rbd_dev->object_map_lock); |
|
__rbd_object_map_index(rbd_dev, objno, &index, &shift); |
|
return (rbd_dev->object_map[index] >> shift) & OBJ_MASK; |
|
} |
|
|
|
static void __rbd_object_map_set(struct rbd_device *rbd_dev, u64 objno, u8 val) |
|
{ |
|
u64 index; |
|
u8 shift; |
|
u8 *p; |
|
|
|
lockdep_assert_held(&rbd_dev->object_map_lock); |
|
rbd_assert(!(val & ~OBJ_MASK)); |
|
|
|
__rbd_object_map_index(rbd_dev, objno, &index, &shift); |
|
p = &rbd_dev->object_map[index]; |
|
*p = (*p & ~(OBJ_MASK << shift)) | (val << shift); |
|
} |
|
|
|
static u8 rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
|
{ |
|
u8 state; |
|
|
|
spin_lock(&rbd_dev->object_map_lock); |
|
state = __rbd_object_map_get(rbd_dev, objno); |
|
spin_unlock(&rbd_dev->object_map_lock); |
|
return state; |
|
} |
|
|
|
static bool use_object_map(struct rbd_device *rbd_dev) |
|
{ |
|
/* |
|
* An image mapped read-only can't use the object map -- it isn't |
|
* loaded because the header lock isn't acquired. Someone else can |
|
* write to the image and update the object map behind our back. |
|
* |
|
* A snapshot can't be written to, so using the object map is always |
|
* safe. |
|
*/ |
|
if (!rbd_is_snap(rbd_dev) && rbd_is_ro(rbd_dev)) |
|
return false; |
|
|
|
return ((rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) && |
|
!(rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID)); |
|
} |
|
|
|
static bool rbd_object_map_may_exist(struct rbd_device *rbd_dev, u64 objno) |
|
{ |
|
u8 state; |
|
|
|
/* fall back to default logic if object map is disabled or invalid */ |
|
if (!use_object_map(rbd_dev)) |
|
return true; |
|
|
|
state = rbd_object_map_get(rbd_dev, objno); |
|
return state != OBJECT_NONEXISTENT; |
|
} |
|
|
|
static void rbd_object_map_name(struct rbd_device *rbd_dev, u64 snap_id, |
|
struct ceph_object_id *oid) |
|
{ |
|
if (snap_id == CEPH_NOSNAP) |
|
ceph_oid_printf(oid, "%s%s", RBD_OBJECT_MAP_PREFIX, |
|
rbd_dev->spec->image_id); |
|
else |
|
ceph_oid_printf(oid, "%s%s.%016llx", RBD_OBJECT_MAP_PREFIX, |
|
rbd_dev->spec->image_id, snap_id); |
|
} |
|
|
|
static int rbd_object_map_lock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
CEPH_DEFINE_OID_ONSTACK(oid); |
|
u8 lock_type; |
|
char *lock_tag; |
|
struct ceph_locker *lockers; |
|
u32 num_lockers; |
|
bool broke_lock = false; |
|
int ret; |
|
|
|
rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); |
|
|
|
again: |
|
ret = ceph_cls_lock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, |
|
CEPH_CLS_LOCK_EXCLUSIVE, "", "", "", 0); |
|
if (ret != -EBUSY || broke_lock) { |
|
if (ret == -EEXIST) |
|
ret = 0; /* already locked by myself */ |
|
if (ret) |
|
rbd_warn(rbd_dev, "failed to lock object map: %d", ret); |
|
return ret; |
|
} |
|
|
|
ret = ceph_cls_lock_info(osdc, &oid, &rbd_dev->header_oloc, |
|
RBD_LOCK_NAME, &lock_type, &lock_tag, |
|
&lockers, &num_lockers); |
|
if (ret) { |
|
if (ret == -ENOENT) |
|
goto again; |
|
|
|
rbd_warn(rbd_dev, "failed to get object map lockers: %d", ret); |
|
return ret; |
|
} |
|
|
|
kfree(lock_tag); |
|
if (num_lockers == 0) |
|
goto again; |
|
|
|
rbd_warn(rbd_dev, "breaking object map lock owned by %s%llu", |
|
ENTITY_NAME(lockers[0].id.name)); |
|
|
|
ret = ceph_cls_break_lock(osdc, &oid, &rbd_dev->header_oloc, |
|
RBD_LOCK_NAME, lockers[0].id.cookie, |
|
&lockers[0].id.name); |
|
ceph_free_lockers(lockers, num_lockers); |
|
if (ret) { |
|
if (ret == -ENOENT) |
|
goto again; |
|
|
|
rbd_warn(rbd_dev, "failed to break object map lock: %d", ret); |
|
return ret; |
|
} |
|
|
|
broke_lock = true; |
|
goto again; |
|
} |
|
|
|
static void rbd_object_map_unlock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
CEPH_DEFINE_OID_ONSTACK(oid); |
|
int ret; |
|
|
|
rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); |
|
|
|
ret = ceph_cls_unlock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, |
|
""); |
|
if (ret && ret != -ENOENT) |
|
rbd_warn(rbd_dev, "failed to unlock object map: %d", ret); |
|
} |
|
|
|
static int decode_object_map_header(void **p, void *end, u64 *object_map_size) |
|
{ |
|
u8 struct_v; |
|
u32 struct_len; |
|
u32 header_len; |
|
void *header_end; |
|
int ret; |
|
|
|
ceph_decode_32_safe(p, end, header_len, e_inval); |
|
header_end = *p + header_len; |
|
|
|
ret = ceph_start_decoding(p, end, 1, "BitVector header", &struct_v, |
|
&struct_len); |
|
if (ret) |
|
return ret; |
|
|
|
ceph_decode_64_safe(p, end, *object_map_size, e_inval); |
|
|
|
*p = header_end; |
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int __rbd_object_map_load(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
CEPH_DEFINE_OID_ONSTACK(oid); |
|
struct page **pages; |
|
void *p, *end; |
|
size_t reply_len; |
|
u64 num_objects; |
|
u64 object_map_bytes; |
|
u64 object_map_size; |
|
int num_pages; |
|
int ret; |
|
|
|
rbd_assert(!rbd_dev->object_map && !rbd_dev->object_map_size); |
|
|
|
num_objects = ceph_get_num_objects(&rbd_dev->layout, |
|
rbd_dev->mapping.size); |
|
object_map_bytes = DIV_ROUND_UP_ULL(num_objects * BITS_PER_OBJ, |
|
BITS_PER_BYTE); |
|
num_pages = calc_pages_for(0, object_map_bytes) + 1; |
|
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
|
if (IS_ERR(pages)) |
|
return PTR_ERR(pages); |
|
|
|
reply_len = num_pages * PAGE_SIZE; |
|
rbd_object_map_name(rbd_dev, rbd_dev->spec->snap_id, &oid); |
|
ret = ceph_osdc_call(osdc, &oid, &rbd_dev->header_oloc, |
|
"rbd", "object_map_load", CEPH_OSD_FLAG_READ, |
|
NULL, 0, pages, &reply_len); |
|
if (ret) |
|
goto out; |
|
|
|
p = page_address(pages[0]); |
|
end = p + min(reply_len, (size_t)PAGE_SIZE); |
|
ret = decode_object_map_header(&p, end, &object_map_size); |
|
if (ret) |
|
goto out; |
|
|
|
if (object_map_size != num_objects) { |
|
rbd_warn(rbd_dev, "object map size mismatch: %llu vs %llu", |
|
object_map_size, num_objects); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (offset_in_page(p) + object_map_bytes > reply_len) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
rbd_dev->object_map = kvmalloc(object_map_bytes, GFP_KERNEL); |
|
if (!rbd_dev->object_map) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
rbd_dev->object_map_size = object_map_size; |
|
ceph_copy_from_page_vector(pages, rbd_dev->object_map, |
|
offset_in_page(p), object_map_bytes); |
|
|
|
out: |
|
ceph_release_page_vector(pages, num_pages); |
|
return ret; |
|
} |
|
|
|
static void rbd_object_map_free(struct rbd_device *rbd_dev) |
|
{ |
|
kvfree(rbd_dev->object_map); |
|
rbd_dev->object_map = NULL; |
|
rbd_dev->object_map_size = 0; |
|
} |
|
|
|
static int rbd_object_map_load(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
ret = __rbd_object_map_load(rbd_dev); |
|
if (ret) |
|
return ret; |
|
|
|
ret = rbd_dev_v2_get_flags(rbd_dev); |
|
if (ret) { |
|
rbd_object_map_free(rbd_dev); |
|
return ret; |
|
} |
|
|
|
if (rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID) |
|
rbd_warn(rbd_dev, "object map is invalid"); |
|
|
|
return 0; |
|
} |
|
|
|
static int rbd_object_map_open(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
ret = rbd_object_map_lock(rbd_dev); |
|
if (ret) |
|
return ret; |
|
|
|
ret = rbd_object_map_load(rbd_dev); |
|
if (ret) { |
|
rbd_object_map_unlock(rbd_dev); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void rbd_object_map_close(struct rbd_device *rbd_dev) |
|
{ |
|
rbd_object_map_free(rbd_dev); |
|
rbd_object_map_unlock(rbd_dev); |
|
} |
|
|
|
/* |
|
* This function needs snap_id (or more precisely just something to |
|
* distinguish between HEAD and snapshot object maps), new_state and |
|
* current_state that were passed to rbd_object_map_update(). |
|
* |
|
* To avoid allocating and stashing a context we piggyback on the OSD |
|
* request. A HEAD update has two ops (assert_locked). For new_state |
|
* and current_state we decode our own object_map_update op, encoded in |
|
* rbd_cls_object_map_update(). |
|
*/ |
|
static int rbd_object_map_update_finish(struct rbd_obj_request *obj_req, |
|
struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
struct ceph_osd_data *osd_data; |
|
u64 objno; |
|
u8 state, new_state, current_state; |
|
bool has_current_state; |
|
void *p; |
|
|
|
if (osd_req->r_result) |
|
return osd_req->r_result; |
|
|
|
/* |
|
* Nothing to do for a snapshot object map. |
|
*/ |
|
if (osd_req->r_num_ops == 1) |
|
return 0; |
|
|
|
/* |
|
* Update in-memory HEAD object map. |
|
*/ |
|
rbd_assert(osd_req->r_num_ops == 2); |
|
osd_data = osd_req_op_data(osd_req, 1, cls, request_data); |
|
rbd_assert(osd_data->type == CEPH_OSD_DATA_TYPE_PAGES); |
|
|
|
p = page_address(osd_data->pages[0]); |
|
objno = ceph_decode_64(&p); |
|
rbd_assert(objno == obj_req->ex.oe_objno); |
|
rbd_assert(ceph_decode_64(&p) == objno + 1); |
|
new_state = ceph_decode_8(&p); |
|
has_current_state = ceph_decode_8(&p); |
|
if (has_current_state) |
|
current_state = ceph_decode_8(&p); |
|
|
|
spin_lock(&rbd_dev->object_map_lock); |
|
state = __rbd_object_map_get(rbd_dev, objno); |
|
if (!has_current_state || current_state == state || |
|
(current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) |
|
__rbd_object_map_set(rbd_dev, objno, new_state); |
|
spin_unlock(&rbd_dev->object_map_lock); |
|
|
|
return 0; |
|
} |
|
|
|
static void rbd_object_map_callback(struct ceph_osd_request *osd_req) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
int result; |
|
|
|
dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
|
osd_req->r_result, obj_req); |
|
|
|
result = rbd_object_map_update_finish(obj_req, osd_req); |
|
rbd_obj_handle_request(obj_req, result); |
|
} |
|
|
|
static bool update_needed(struct rbd_device *rbd_dev, u64 objno, u8 new_state) |
|
{ |
|
u8 state = rbd_object_map_get(rbd_dev, objno); |
|
|
|
if (state == new_state || |
|
(new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) || |
|
(new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static int rbd_cls_object_map_update(struct ceph_osd_request *req, |
|
int which, u64 objno, u8 new_state, |
|
const u8 *current_state) |
|
{ |
|
struct page **pages; |
|
void *p, *start; |
|
int ret; |
|
|
|
ret = osd_req_op_cls_init(req, which, "rbd", "object_map_update"); |
|
if (ret) |
|
return ret; |
|
|
|
pages = ceph_alloc_page_vector(1, GFP_NOIO); |
|
if (IS_ERR(pages)) |
|
return PTR_ERR(pages); |
|
|
|
p = start = page_address(pages[0]); |
|
ceph_encode_64(&p, objno); |
|
ceph_encode_64(&p, objno + 1); |
|
ceph_encode_8(&p, new_state); |
|
if (current_state) { |
|
ceph_encode_8(&p, 1); |
|
ceph_encode_8(&p, *current_state); |
|
} else { |
|
ceph_encode_8(&p, 0); |
|
} |
|
|
|
osd_req_op_cls_request_data_pages(req, which, pages, p - start, 0, |
|
false, true); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Return: |
|
* 0 - object map update sent |
|
* 1 - object map update isn't needed |
|
* <0 - error |
|
*/ |
|
static int rbd_object_map_update(struct rbd_obj_request *obj_req, u64 snap_id, |
|
u8 new_state, const u8 *current_state) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct ceph_osd_request *req; |
|
int num_ops = 1; |
|
int which = 0; |
|
int ret; |
|
|
|
if (snap_id == CEPH_NOSNAP) { |
|
if (!update_needed(rbd_dev, obj_req->ex.oe_objno, new_state)) |
|
return 1; |
|
|
|
num_ops++; /* assert_locked */ |
|
} |
|
|
|
req = ceph_osdc_alloc_request(osdc, NULL, num_ops, false, GFP_NOIO); |
|
if (!req) |
|
return -ENOMEM; |
|
|
|
list_add_tail(&req->r_private_item, &obj_req->osd_reqs); |
|
req->r_callback = rbd_object_map_callback; |
|
req->r_priv = obj_req; |
|
|
|
rbd_object_map_name(rbd_dev, snap_id, &req->r_base_oid); |
|
ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); |
|
req->r_flags = CEPH_OSD_FLAG_WRITE; |
|
ktime_get_real_ts64(&req->r_mtime); |
|
|
|
if (snap_id == CEPH_NOSNAP) { |
|
/* |
|
* Protect against possible race conditions during lock |
|
* ownership transitions. |
|
*/ |
|
ret = ceph_cls_assert_locked(req, which++, RBD_LOCK_NAME, |
|
CEPH_CLS_LOCK_EXCLUSIVE, "", ""); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = rbd_cls_object_map_update(req, which, obj_req->ex.oe_objno, |
|
new_state, current_state); |
|
if (ret) |
|
return ret; |
|
|
|
ret = ceph_osdc_alloc_messages(req, GFP_NOIO); |
|
if (ret) |
|
return ret; |
|
|
|
ceph_osdc_start_request(osdc, req, false); |
|
return 0; |
|
} |
|
|
|
static void prune_extents(struct ceph_file_extent *img_extents, |
|
u32 *num_img_extents, u64 overlap) |
|
{ |
|
u32 cnt = *num_img_extents; |
|
|
|
/* drop extents completely beyond the overlap */ |
|
while (cnt && img_extents[cnt - 1].fe_off >= overlap) |
|
cnt--; |
|
|
|
if (cnt) { |
|
struct ceph_file_extent *ex = &img_extents[cnt - 1]; |
|
|
|
/* trim final overlapping extent */ |
|
if (ex->fe_off + ex->fe_len > overlap) |
|
ex->fe_len = overlap - ex->fe_off; |
|
} |
|
|
|
*num_img_extents = cnt; |
|
} |
|
|
|
/* |
|
* Determine the byte range(s) covered by either just the object extent |
|
* or the entire object in the parent image. |
|
*/ |
|
static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, |
|
bool entire) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
int ret; |
|
|
|
if (!rbd_dev->parent_overlap) |
|
return 0; |
|
|
|
ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
|
entire ? 0 : obj_req->ex.oe_off, |
|
entire ? rbd_dev->layout.object_size : |
|
obj_req->ex.oe_len, |
|
&obj_req->img_extents, |
|
&obj_req->num_img_extents); |
|
if (ret) |
|
return ret; |
|
|
|
prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
|
rbd_dev->parent_overlap); |
|
return 0; |
|
} |
|
|
|
static void rbd_osd_setup_data(struct ceph_osd_request *osd_req, int which) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
|
|
switch (obj_req->img_request->data_type) { |
|
case OBJ_REQUEST_BIO: |
|
osd_req_op_extent_osd_data_bio(osd_req, which, |
|
&obj_req->bio_pos, |
|
obj_req->ex.oe_len); |
|
break; |
|
case OBJ_REQUEST_BVECS: |
|
case OBJ_REQUEST_OWN_BVECS: |
|
rbd_assert(obj_req->bvec_pos.iter.bi_size == |
|
obj_req->ex.oe_len); |
|
rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
|
osd_req_op_extent_osd_data_bvec_pos(osd_req, which, |
|
&obj_req->bvec_pos); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static int rbd_osd_setup_stat(struct ceph_osd_request *osd_req, int which) |
|
{ |
|
struct page **pages; |
|
|
|
/* |
|
* The response data for a STAT call consists of: |
|
* le64 length; |
|
* struct { |
|
* le32 tv_sec; |
|
* le32 tv_nsec; |
|
* } mtime; |
|
*/ |
|
pages = ceph_alloc_page_vector(1, GFP_NOIO); |
|
if (IS_ERR(pages)) |
|
return PTR_ERR(pages); |
|
|
|
osd_req_op_init(osd_req, which, CEPH_OSD_OP_STAT, 0); |
|
osd_req_op_raw_data_in_pages(osd_req, which, pages, |
|
8 + sizeof(struct ceph_timespec), |
|
0, false, true); |
|
return 0; |
|
} |
|
|
|
static int rbd_osd_setup_copyup(struct ceph_osd_request *osd_req, int which, |
|
u32 bytes) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
int ret; |
|
|
|
ret = osd_req_op_cls_init(osd_req, which, "rbd", "copyup"); |
|
if (ret) |
|
return ret; |
|
|
|
osd_req_op_cls_request_data_bvecs(osd_req, which, obj_req->copyup_bvecs, |
|
obj_req->copyup_bvec_count, bytes); |
|
return 0; |
|
} |
|
|
|
static int rbd_obj_init_read(struct rbd_obj_request *obj_req) |
|
{ |
|
obj_req->read_state = RBD_OBJ_READ_START; |
|
return 0; |
|
} |
|
|
|
static void __rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
|
int which) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
u16 opcode; |
|
|
|
if (!use_object_map(rbd_dev) || |
|
!(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) { |
|
osd_req_op_alloc_hint_init(osd_req, which++, |
|
rbd_dev->layout.object_size, |
|
rbd_dev->layout.object_size, |
|
rbd_dev->opts->alloc_hint_flags); |
|
} |
|
|
|
if (rbd_obj_is_entire(obj_req)) |
|
opcode = CEPH_OSD_OP_WRITEFULL; |
|
else |
|
opcode = CEPH_OSD_OP_WRITE; |
|
|
|
osd_req_op_extent_init(osd_req, which, opcode, |
|
obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
|
rbd_osd_setup_data(osd_req, which); |
|
} |
|
|
|
static int rbd_obj_init_write(struct rbd_obj_request *obj_req) |
|
{ |
|
int ret; |
|
|
|
/* reverse map the entire object onto the parent */ |
|
ret = rbd_obj_calc_img_extents(obj_req, true); |
|
if (ret) |
|
return ret; |
|
|
|
if (rbd_obj_copyup_enabled(obj_req)) |
|
obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; |
|
|
|
obj_req->write_state = RBD_OBJ_WRITE_START; |
|
return 0; |
|
} |
|
|
|
static u16 truncate_or_zero_opcode(struct rbd_obj_request *obj_req) |
|
{ |
|
return rbd_obj_is_tail(obj_req) ? CEPH_OSD_OP_TRUNCATE : |
|
CEPH_OSD_OP_ZERO; |
|
} |
|
|
|
static void __rbd_osd_setup_discard_ops(struct ceph_osd_request *osd_req, |
|
int which) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
|
|
if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) { |
|
rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); |
|
osd_req_op_init(osd_req, which, CEPH_OSD_OP_DELETE, 0); |
|
} else { |
|
osd_req_op_extent_init(osd_req, which, |
|
truncate_or_zero_opcode(obj_req), |
|
obj_req->ex.oe_off, obj_req->ex.oe_len, |
|
0, 0); |
|
} |
|
} |
|
|
|
static int rbd_obj_init_discard(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
u64 off, next_off; |
|
int ret; |
|
|
|
/* |
|
* Align the range to alloc_size boundary and punt on discards |
|
* that are too small to free up any space. |
|
* |
|
* alloc_size == object_size && is_tail() is a special case for |
|
* filestore with filestore_punch_hole = false, needed to allow |
|
* truncate (in addition to delete). |
|
*/ |
|
if (rbd_dev->opts->alloc_size != rbd_dev->layout.object_size || |
|
!rbd_obj_is_tail(obj_req)) { |
|
off = round_up(obj_req->ex.oe_off, rbd_dev->opts->alloc_size); |
|
next_off = round_down(obj_req->ex.oe_off + obj_req->ex.oe_len, |
|
rbd_dev->opts->alloc_size); |
|
if (off >= next_off) |
|
return 1; |
|
|
|
dout("%s %p %llu~%llu -> %llu~%llu\n", __func__, |
|
obj_req, obj_req->ex.oe_off, obj_req->ex.oe_len, |
|
off, next_off - off); |
|
obj_req->ex.oe_off = off; |
|
obj_req->ex.oe_len = next_off - off; |
|
} |
|
|
|
/* reverse map the entire object onto the parent */ |
|
ret = rbd_obj_calc_img_extents(obj_req, true); |
|
if (ret) |
|
return ret; |
|
|
|
obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
|
if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) |
|
obj_req->flags |= RBD_OBJ_FLAG_DELETION; |
|
|
|
obj_req->write_state = RBD_OBJ_WRITE_START; |
|
return 0; |
|
} |
|
|
|
static void __rbd_osd_setup_zeroout_ops(struct ceph_osd_request *osd_req, |
|
int which) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
u16 opcode; |
|
|
|
if (rbd_obj_is_entire(obj_req)) { |
|
if (obj_req->num_img_extents) { |
|
if (!(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) |
|
osd_req_op_init(osd_req, which++, |
|
CEPH_OSD_OP_CREATE, 0); |
|
opcode = CEPH_OSD_OP_TRUNCATE; |
|
} else { |
|
rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); |
|
osd_req_op_init(osd_req, which++, |
|
CEPH_OSD_OP_DELETE, 0); |
|
opcode = 0; |
|
} |
|
} else { |
|
opcode = truncate_or_zero_opcode(obj_req); |
|
} |
|
|
|
if (opcode) |
|
osd_req_op_extent_init(osd_req, which, opcode, |
|
obj_req->ex.oe_off, obj_req->ex.oe_len, |
|
0, 0); |
|
} |
|
|
|
static int rbd_obj_init_zeroout(struct rbd_obj_request *obj_req) |
|
{ |
|
int ret; |
|
|
|
/* reverse map the entire object onto the parent */ |
|
ret = rbd_obj_calc_img_extents(obj_req, true); |
|
if (ret) |
|
return ret; |
|
|
|
if (rbd_obj_copyup_enabled(obj_req)) |
|
obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; |
|
if (!obj_req->num_img_extents) { |
|
obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
|
if (rbd_obj_is_entire(obj_req)) |
|
obj_req->flags |= RBD_OBJ_FLAG_DELETION; |
|
} |
|
|
|
obj_req->write_state = RBD_OBJ_WRITE_START; |
|
return 0; |
|
} |
|
|
|
static int count_write_ops(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_img_request *img_req = obj_req->img_request; |
|
|
|
switch (img_req->op_type) { |
|
case OBJ_OP_WRITE: |
|
if (!use_object_map(img_req->rbd_dev) || |
|
!(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) |
|
return 2; /* setallochint + write/writefull */ |
|
|
|
return 1; /* write/writefull */ |
|
case OBJ_OP_DISCARD: |
|
return 1; /* delete/truncate/zero */ |
|
case OBJ_OP_ZEROOUT: |
|
if (rbd_obj_is_entire(obj_req) && obj_req->num_img_extents && |
|
!(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) |
|
return 2; /* create + truncate */ |
|
|
|
return 1; /* delete/truncate/zero */ |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static void rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
|
int which) |
|
{ |
|
struct rbd_obj_request *obj_req = osd_req->r_priv; |
|
|
|
switch (obj_req->img_request->op_type) { |
|
case OBJ_OP_WRITE: |
|
__rbd_osd_setup_write_ops(osd_req, which); |
|
break; |
|
case OBJ_OP_DISCARD: |
|
__rbd_osd_setup_discard_ops(osd_req, which); |
|
break; |
|
case OBJ_OP_ZEROOUT: |
|
__rbd_osd_setup_zeroout_ops(osd_req, which); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* |
|
* Prune the list of object requests (adjust offset and/or length, drop |
|
* redundant requests). Prepare object request state machines and image |
|
* request state machine for execution. |
|
*/ |
|
static int __rbd_img_fill_request(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_obj_request *obj_req, *next_obj_req; |
|
int ret; |
|
|
|
for_each_obj_request_safe(img_req, obj_req, next_obj_req) { |
|
switch (img_req->op_type) { |
|
case OBJ_OP_READ: |
|
ret = rbd_obj_init_read(obj_req); |
|
break; |
|
case OBJ_OP_WRITE: |
|
ret = rbd_obj_init_write(obj_req); |
|
break; |
|
case OBJ_OP_DISCARD: |
|
ret = rbd_obj_init_discard(obj_req); |
|
break; |
|
case OBJ_OP_ZEROOUT: |
|
ret = rbd_obj_init_zeroout(obj_req); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
if (ret < 0) |
|
return ret; |
|
if (ret > 0) { |
|
rbd_img_obj_request_del(img_req, obj_req); |
|
continue; |
|
} |
|
} |
|
|
|
img_req->state = RBD_IMG_START; |
|
return 0; |
|
} |
|
|
|
union rbd_img_fill_iter { |
|
struct ceph_bio_iter bio_iter; |
|
struct ceph_bvec_iter bvec_iter; |
|
}; |
|
|
|
struct rbd_img_fill_ctx { |
|
enum obj_request_type pos_type; |
|
union rbd_img_fill_iter *pos; |
|
union rbd_img_fill_iter iter; |
|
ceph_object_extent_fn_t set_pos_fn; |
|
ceph_object_extent_fn_t count_fn; |
|
ceph_object_extent_fn_t copy_fn; |
|
}; |
|
|
|
static struct ceph_object_extent *alloc_object_extent(void *arg) |
|
{ |
|
struct rbd_img_request *img_req = arg; |
|
struct rbd_obj_request *obj_req; |
|
|
|
obj_req = rbd_obj_request_create(); |
|
if (!obj_req) |
|
return NULL; |
|
|
|
rbd_img_obj_request_add(img_req, obj_req); |
|
return &obj_req->ex; |
|
} |
|
|
|
/* |
|
* While su != os && sc == 1 is technically not fancy (it's the same |
|
* layout as su == os && sc == 1), we can't use the nocopy path for it |
|
* because ->set_pos_fn() should be called only once per object. |
|
* ceph_file_to_extents() invokes action_fn once per stripe unit, so |
|
* treat su != os && sc == 1 as fancy. |
|
*/ |
|
static bool rbd_layout_is_fancy(struct ceph_file_layout *l) |
|
{ |
|
return l->stripe_unit != l->object_size; |
|
} |
|
|
|
static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
|
struct ceph_file_extent *img_extents, |
|
u32 num_img_extents, |
|
struct rbd_img_fill_ctx *fctx) |
|
{ |
|
u32 i; |
|
int ret; |
|
|
|
img_req->data_type = fctx->pos_type; |
|
|
|
/* |
|
* Create object requests and set each object request's starting |
|
* position in the provided bio (list) or bio_vec array. |
|
*/ |
|
fctx->iter = *fctx->pos; |
|
for (i = 0; i < num_img_extents; i++) { |
|
ret = ceph_file_to_extents(&img_req->rbd_dev->layout, |
|
img_extents[i].fe_off, |
|
img_extents[i].fe_len, |
|
&img_req->object_extents, |
|
alloc_object_extent, img_req, |
|
fctx->set_pos_fn, &fctx->iter); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return __rbd_img_fill_request(img_req); |
|
} |
|
|
|
/* |
|
* Map a list of image extents to a list of object extents, create the |
|
* corresponding object requests (normally each to a different object, |
|
* but not always) and add them to @img_req. For each object request, |
|
* set up its data descriptor to point to the corresponding chunk(s) of |
|
* @fctx->pos data buffer. |
|
* |
|
* Because ceph_file_to_extents() will merge adjacent object extents |
|
* together, each object request's data descriptor may point to multiple |
|
* different chunks of @fctx->pos data buffer. |
|
* |
|
* @fctx->pos data buffer is assumed to be large enough. |
|
*/ |
|
static int rbd_img_fill_request(struct rbd_img_request *img_req, |
|
struct ceph_file_extent *img_extents, |
|
u32 num_img_extents, |
|
struct rbd_img_fill_ctx *fctx) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
struct rbd_obj_request *obj_req; |
|
u32 i; |
|
int ret; |
|
|
|
if (fctx->pos_type == OBJ_REQUEST_NODATA || |
|
!rbd_layout_is_fancy(&rbd_dev->layout)) |
|
return rbd_img_fill_request_nocopy(img_req, img_extents, |
|
num_img_extents, fctx); |
|
|
|
img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
|
|
|
/* |
|
* Create object requests and determine ->bvec_count for each object |
|
* request. Note that ->bvec_count sum over all object requests may |
|
* be greater than the number of bio_vecs in the provided bio (list) |
|
* or bio_vec array because when mapped, those bio_vecs can straddle |
|
* stripe unit boundaries. |
|
*/ |
|
fctx->iter = *fctx->pos; |
|
for (i = 0; i < num_img_extents; i++) { |
|
ret = ceph_file_to_extents(&rbd_dev->layout, |
|
img_extents[i].fe_off, |
|
img_extents[i].fe_len, |
|
&img_req->object_extents, |
|
alloc_object_extent, img_req, |
|
fctx->count_fn, &fctx->iter); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
for_each_obj_request(img_req, obj_req) { |
|
obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, |
|
sizeof(*obj_req->bvec_pos.bvecs), |
|
GFP_NOIO); |
|
if (!obj_req->bvec_pos.bvecs) |
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* Fill in each object request's private bio_vec array, splitting and |
|
* rearranging the provided bio_vecs in stripe unit chunks as needed. |
|
*/ |
|
fctx->iter = *fctx->pos; |
|
for (i = 0; i < num_img_extents; i++) { |
|
ret = ceph_iterate_extents(&rbd_dev->layout, |
|
img_extents[i].fe_off, |
|
img_extents[i].fe_len, |
|
&img_req->object_extents, |
|
fctx->copy_fn, &fctx->iter); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return __rbd_img_fill_request(img_req); |
|
} |
|
|
|
static int rbd_img_fill_nodata(struct rbd_img_request *img_req, |
|
u64 off, u64 len) |
|
{ |
|
struct ceph_file_extent ex = { off, len }; |
|
union rbd_img_fill_iter dummy = {}; |
|
struct rbd_img_fill_ctx fctx = { |
|
.pos_type = OBJ_REQUEST_NODATA, |
|
.pos = &dummy, |
|
}; |
|
|
|
return rbd_img_fill_request(img_req, &ex, 1, &fctx); |
|
} |
|
|
|
static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bio_iter *it = arg; |
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
|
obj_req->bio_pos = *it; |
|
ceph_bio_iter_advance(it, bytes); |
|
} |
|
|
|
static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bio_iter *it = arg; |
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
|
ceph_bio_iter_advance_step(it, bytes, ({ |
|
obj_req->bvec_count++; |
|
})); |
|
|
|
} |
|
|
|
static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bio_iter *it = arg; |
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
|
ceph_bio_iter_advance_step(it, bytes, ({ |
|
obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; |
|
obj_req->bvec_pos.iter.bi_size += bv.bv_len; |
|
})); |
|
} |
|
|
|
static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
|
struct ceph_file_extent *img_extents, |
|
u32 num_img_extents, |
|
struct ceph_bio_iter *bio_pos) |
|
{ |
|
struct rbd_img_fill_ctx fctx = { |
|
.pos_type = OBJ_REQUEST_BIO, |
|
.pos = (union rbd_img_fill_iter *)bio_pos, |
|
.set_pos_fn = set_bio_pos, |
|
.count_fn = count_bio_bvecs, |
|
.copy_fn = copy_bio_bvecs, |
|
}; |
|
|
|
return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
|
&fctx); |
|
} |
|
|
|
static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
|
u64 off, u64 len, struct bio *bio) |
|
{ |
|
struct ceph_file_extent ex = { off, len }; |
|
struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; |
|
|
|
return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
|
} |
|
|
|
static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bvec_iter *it = arg; |
|
|
|
obj_req->bvec_pos = *it; |
|
ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); |
|
ceph_bvec_iter_advance(it, bytes); |
|
} |
|
|
|
static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bvec_iter *it = arg; |
|
|
|
ceph_bvec_iter_advance_step(it, bytes, ({ |
|
obj_req->bvec_count++; |
|
})); |
|
} |
|
|
|
static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
|
{ |
|
struct rbd_obj_request *obj_req = |
|
container_of(ex, struct rbd_obj_request, ex); |
|
struct ceph_bvec_iter *it = arg; |
|
|
|
ceph_bvec_iter_advance_step(it, bytes, ({ |
|
obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; |
|
obj_req->bvec_pos.iter.bi_size += bv.bv_len; |
|
})); |
|
} |
|
|
|
static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
|
struct ceph_file_extent *img_extents, |
|
u32 num_img_extents, |
|
struct ceph_bvec_iter *bvec_pos) |
|
{ |
|
struct rbd_img_fill_ctx fctx = { |
|
.pos_type = OBJ_REQUEST_BVECS, |
|
.pos = (union rbd_img_fill_iter *)bvec_pos, |
|
.set_pos_fn = set_bvec_pos, |
|
.count_fn = count_bvecs, |
|
.copy_fn = copy_bvecs, |
|
}; |
|
|
|
return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
|
&fctx); |
|
} |
|
|
|
static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
|
struct ceph_file_extent *img_extents, |
|
u32 num_img_extents, |
|
struct bio_vec *bvecs) |
|
{ |
|
struct ceph_bvec_iter it = { |
|
.bvecs = bvecs, |
|
.iter = { .bi_size = ceph_file_extents_bytes(img_extents, |
|
num_img_extents) }, |
|
}; |
|
|
|
return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
|
&it); |
|
} |
|
|
|
static void rbd_img_handle_request_work(struct work_struct *work) |
|
{ |
|
struct rbd_img_request *img_req = |
|
container_of(work, struct rbd_img_request, work); |
|
|
|
rbd_img_handle_request(img_req, img_req->work_result); |
|
} |
|
|
|
static void rbd_img_schedule(struct rbd_img_request *img_req, int result) |
|
{ |
|
INIT_WORK(&img_req->work, rbd_img_handle_request_work); |
|
img_req->work_result = result; |
|
queue_work(rbd_wq, &img_req->work); |
|
} |
|
|
|
static bool rbd_obj_may_exist(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
|
|
if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) { |
|
obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; |
|
return true; |
|
} |
|
|
|
dout("%s %p objno %llu assuming dne\n", __func__, obj_req, |
|
obj_req->ex.oe_objno); |
|
return false; |
|
} |
|
|
|
static int rbd_obj_read_object(struct rbd_obj_request *obj_req) |
|
{ |
|
struct ceph_osd_request *osd_req; |
|
int ret; |
|
|
|
osd_req = __rbd_obj_add_osd_request(obj_req, NULL, 1); |
|
if (IS_ERR(osd_req)) |
|
return PTR_ERR(osd_req); |
|
|
|
osd_req_op_extent_init(osd_req, 0, CEPH_OSD_OP_READ, |
|
obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
|
rbd_osd_setup_data(osd_req, 0); |
|
rbd_osd_format_read(osd_req); |
|
|
|
ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_osd_submit(osd_req); |
|
return 0; |
|
} |
|
|
|
static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_img_request *img_req = obj_req->img_request; |
|
struct rbd_device *parent = img_req->rbd_dev->parent; |
|
struct rbd_img_request *child_img_req; |
|
int ret; |
|
|
|
child_img_req = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
|
if (!child_img_req) |
|
return -ENOMEM; |
|
|
|
rbd_img_request_init(child_img_req, parent, OBJ_OP_READ); |
|
__set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
|
child_img_req->obj_request = obj_req; |
|
|
|
down_read(&parent->header_rwsem); |
|
rbd_img_capture_header(child_img_req); |
|
up_read(&parent->header_rwsem); |
|
|
|
dout("%s child_img_req %p for obj_req %p\n", __func__, child_img_req, |
|
obj_req); |
|
|
|
if (!rbd_img_is_write(img_req)) { |
|
switch (img_req->data_type) { |
|
case OBJ_REQUEST_BIO: |
|
ret = __rbd_img_fill_from_bio(child_img_req, |
|
obj_req->img_extents, |
|
obj_req->num_img_extents, |
|
&obj_req->bio_pos); |
|
break; |
|
case OBJ_REQUEST_BVECS: |
|
case OBJ_REQUEST_OWN_BVECS: |
|
ret = __rbd_img_fill_from_bvecs(child_img_req, |
|
obj_req->img_extents, |
|
obj_req->num_img_extents, |
|
&obj_req->bvec_pos); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} else { |
|
ret = rbd_img_fill_from_bvecs(child_img_req, |
|
obj_req->img_extents, |
|
obj_req->num_img_extents, |
|
obj_req->copyup_bvecs); |
|
} |
|
if (ret) { |
|
rbd_img_request_destroy(child_img_req); |
|
return ret; |
|
} |
|
|
|
/* avoid parent chain recursion */ |
|
rbd_img_schedule(child_img_req, 0); |
|
return 0; |
|
} |
|
|
|
static bool rbd_obj_advance_read(struct rbd_obj_request *obj_req, int *result) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
int ret; |
|
|
|
again: |
|
switch (obj_req->read_state) { |
|
case RBD_OBJ_READ_START: |
|
rbd_assert(!*result); |
|
|
|
if (!rbd_obj_may_exist(obj_req)) { |
|
*result = -ENOENT; |
|
obj_req->read_state = RBD_OBJ_READ_OBJECT; |
|
goto again; |
|
} |
|
|
|
ret = rbd_obj_read_object(obj_req); |
|
if (ret) { |
|
*result = ret; |
|
return true; |
|
} |
|
obj_req->read_state = RBD_OBJ_READ_OBJECT; |
|
return false; |
|
case RBD_OBJ_READ_OBJECT: |
|
if (*result == -ENOENT && rbd_dev->parent_overlap) { |
|
/* reverse map this object extent onto the parent */ |
|
ret = rbd_obj_calc_img_extents(obj_req, false); |
|
if (ret) { |
|
*result = ret; |
|
return true; |
|
} |
|
if (obj_req->num_img_extents) { |
|
ret = rbd_obj_read_from_parent(obj_req); |
|
if (ret) { |
|
*result = ret; |
|
return true; |
|
} |
|
obj_req->read_state = RBD_OBJ_READ_PARENT; |
|
return false; |
|
} |
|
} |
|
|
|
/* |
|
* -ENOENT means a hole in the image -- zero-fill the entire |
|
* length of the request. A short read also implies zero-fill |
|
* to the end of the request. |
|
*/ |
|
if (*result == -ENOENT) { |
|
rbd_obj_zero_range(obj_req, 0, obj_req->ex.oe_len); |
|
*result = 0; |
|
} else if (*result >= 0) { |
|
if (*result < obj_req->ex.oe_len) |
|
rbd_obj_zero_range(obj_req, *result, |
|
obj_req->ex.oe_len - *result); |
|
else |
|
rbd_assert(*result == obj_req->ex.oe_len); |
|
*result = 0; |
|
} |
|
return true; |
|
case RBD_OBJ_READ_PARENT: |
|
/* |
|
* The parent image is read only up to the overlap -- zero-fill |
|
* from the overlap to the end of the request. |
|
*/ |
|
if (!*result) { |
|
u32 obj_overlap = rbd_obj_img_extents_bytes(obj_req); |
|
|
|
if (obj_overlap < obj_req->ex.oe_len) |
|
rbd_obj_zero_range(obj_req, obj_overlap, |
|
obj_req->ex.oe_len - obj_overlap); |
|
} |
|
return true; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static bool rbd_obj_write_is_noop(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
|
|
if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) |
|
obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; |
|
|
|
if (!(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST) && |
|
(obj_req->flags & RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT)) { |
|
dout("%s %p noop for nonexistent\n", __func__, obj_req); |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* Return: |
|
* 0 - object map update sent |
|
* 1 - object map update isn't needed |
|
* <0 - error |
|
*/ |
|
static int rbd_obj_write_pre_object_map(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
u8 new_state; |
|
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
|
return 1; |
|
|
|
if (obj_req->flags & RBD_OBJ_FLAG_DELETION) |
|
new_state = OBJECT_PENDING; |
|
else |
|
new_state = OBJECT_EXISTS; |
|
|
|
return rbd_object_map_update(obj_req, CEPH_NOSNAP, new_state, NULL); |
|
} |
|
|
|
static int rbd_obj_write_object(struct rbd_obj_request *obj_req) |
|
{ |
|
struct ceph_osd_request *osd_req; |
|
int num_ops = count_write_ops(obj_req); |
|
int which = 0; |
|
int ret; |
|
|
|
if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) |
|
num_ops++; /* stat */ |
|
|
|
osd_req = rbd_obj_add_osd_request(obj_req, num_ops); |
|
if (IS_ERR(osd_req)) |
|
return PTR_ERR(osd_req); |
|
|
|
if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { |
|
ret = rbd_osd_setup_stat(osd_req, which++); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
rbd_osd_setup_write_ops(osd_req, which); |
|
rbd_osd_format_write(osd_req); |
|
|
|
ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_osd_submit(osd_req); |
|
return 0; |
|
} |
|
|
|
/* |
|
* copyup_bvecs pages are never highmem pages |
|
*/ |
|
static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) |
|
{ |
|
struct ceph_bvec_iter it = { |
|
.bvecs = bvecs, |
|
.iter = { .bi_size = bytes }, |
|
}; |
|
|
|
ceph_bvec_iter_advance_step(&it, bytes, ({ |
|
if (memchr_inv(bvec_virt(&bv), 0, bv.bv_len)) |
|
return false; |
|
})); |
|
return true; |
|
} |
|
|
|
#define MODS_ONLY U32_MAX |
|
|
|
static int rbd_obj_copyup_empty_snapc(struct rbd_obj_request *obj_req, |
|
u32 bytes) |
|
{ |
|
struct ceph_osd_request *osd_req; |
|
int ret; |
|
|
|
dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
|
rbd_assert(bytes > 0 && bytes != MODS_ONLY); |
|
|
|
osd_req = __rbd_obj_add_osd_request(obj_req, &rbd_empty_snapc, 1); |
|
if (IS_ERR(osd_req)) |
|
return PTR_ERR(osd_req); |
|
|
|
ret = rbd_osd_setup_copyup(osd_req, 0, bytes); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_osd_format_write(osd_req); |
|
|
|
ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_osd_submit(osd_req); |
|
return 0; |
|
} |
|
|
|
static int rbd_obj_copyup_current_snapc(struct rbd_obj_request *obj_req, |
|
u32 bytes) |
|
{ |
|
struct ceph_osd_request *osd_req; |
|
int num_ops = count_write_ops(obj_req); |
|
int which = 0; |
|
int ret; |
|
|
|
dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
|
|
|
if (bytes != MODS_ONLY) |
|
num_ops++; /* copyup */ |
|
|
|
osd_req = rbd_obj_add_osd_request(obj_req, num_ops); |
|
if (IS_ERR(osd_req)) |
|
return PTR_ERR(osd_req); |
|
|
|
if (bytes != MODS_ONLY) { |
|
ret = rbd_osd_setup_copyup(osd_req, which++, bytes); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
rbd_osd_setup_write_ops(osd_req, which); |
|
rbd_osd_format_write(osd_req); |
|
|
|
ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
|
if (ret) |
|
return ret; |
|
|
|
rbd_osd_submit(osd_req); |
|
return 0; |
|
} |
|
|
|
static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
|
{ |
|
u32 i; |
|
|
|
rbd_assert(!obj_req->copyup_bvecs); |
|
obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); |
|
obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, |
|
sizeof(*obj_req->copyup_bvecs), |
|
GFP_NOIO); |
|
if (!obj_req->copyup_bvecs) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
|
unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); |
|
|
|
obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); |
|
if (!obj_req->copyup_bvecs[i].bv_page) |
|
return -ENOMEM; |
|
|
|
obj_req->copyup_bvecs[i].bv_offset = 0; |
|
obj_req->copyup_bvecs[i].bv_len = len; |
|
obj_overlap -= len; |
|
} |
|
|
|
rbd_assert(!obj_overlap); |
|
return 0; |
|
} |
|
|
|
/* |
|
* The target object doesn't exist. Read the data for the entire |
|
* target object up to the overlap point (if any) from the parent, |
|
* so we can use it for a copyup. |
|
*/ |
|
static int rbd_obj_copyup_read_parent(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
int ret; |
|
|
|
rbd_assert(obj_req->num_img_extents); |
|
prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
|
rbd_dev->parent_overlap); |
|
if (!obj_req->num_img_extents) { |
|
/* |
|
* The overlap has become 0 (most likely because the |
|
* image has been flattened). Re-submit the original write |
|
* request -- pass MODS_ONLY since the copyup isn't needed |
|
* anymore. |
|
*/ |
|
return rbd_obj_copyup_current_snapc(obj_req, MODS_ONLY); |
|
} |
|
|
|
ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
|
if (ret) |
|
return ret; |
|
|
|
return rbd_obj_read_from_parent(obj_req); |
|
} |
|
|
|
static void rbd_obj_copyup_object_maps(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
struct ceph_snap_context *snapc = obj_req->img_request->snapc; |
|
u8 new_state; |
|
u32 i; |
|
int ret; |
|
|
|
rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); |
|
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
|
return; |
|
|
|
if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) |
|
return; |
|
|
|
for (i = 0; i < snapc->num_snaps; i++) { |
|
if ((rbd_dev->header.features & RBD_FEATURE_FAST_DIFF) && |
|
i + 1 < snapc->num_snaps) |
|
new_state = OBJECT_EXISTS_CLEAN; |
|
else |
|
new_state = OBJECT_EXISTS; |
|
|
|
ret = rbd_object_map_update(obj_req, snapc->snaps[i], |
|
new_state, NULL); |
|
if (ret < 0) { |
|
obj_req->pending.result = ret; |
|
return; |
|
} |
|
|
|
rbd_assert(!ret); |
|
obj_req->pending.num_pending++; |
|
} |
|
} |
|
|
|
static void rbd_obj_copyup_write_object(struct rbd_obj_request *obj_req) |
|
{ |
|
u32 bytes = rbd_obj_img_extents_bytes(obj_req); |
|
int ret; |
|
|
|
rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); |
|
|
|
/* |
|
* Only send non-zero copyup data to save some I/O and network |
|
* bandwidth -- zero copyup data is equivalent to the object not |
|
* existing. |
|
*/ |
|
if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) |
|
bytes = 0; |
|
|
|
if (obj_req->img_request->snapc->num_snaps && bytes > 0) { |
|
/* |
|
* Send a copyup request with an empty snapshot context to |
|
* deep-copyup the object through all existing snapshots. |
|
* A second request with the current snapshot context will be |
|
* sent for the actual modification. |
|
*/ |
|
ret = rbd_obj_copyup_empty_snapc(obj_req, bytes); |
|
if (ret) { |
|
obj_req->pending.result = ret; |
|
return; |
|
} |
|
|
|
obj_req->pending.num_pending++; |
|
bytes = MODS_ONLY; |
|
} |
|
|
|
ret = rbd_obj_copyup_current_snapc(obj_req, bytes); |
|
if (ret) { |
|
obj_req->pending.result = ret; |
|
return; |
|
} |
|
|
|
obj_req->pending.num_pending++; |
|
} |
|
|
|
static bool rbd_obj_advance_copyup(struct rbd_obj_request *obj_req, int *result) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
int ret; |
|
|
|
again: |
|
switch (obj_req->copyup_state) { |
|
case RBD_OBJ_COPYUP_START: |
|
rbd_assert(!*result); |
|
|
|
ret = rbd_obj_copyup_read_parent(obj_req); |
|
if (ret) { |
|
*result = ret; |
|
return true; |
|
} |
|
if (obj_req->num_img_extents) |
|
obj_req->copyup_state = RBD_OBJ_COPYUP_READ_PARENT; |
|
else |
|
obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; |
|
return false; |
|
case RBD_OBJ_COPYUP_READ_PARENT: |
|
if (*result) |
|
return true; |
|
|
|
if (is_zero_bvecs(obj_req->copyup_bvecs, |
|
rbd_obj_img_extents_bytes(obj_req))) { |
|
dout("%s %p detected zeros\n", __func__, obj_req); |
|
obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ZEROS; |
|
} |
|
|
|
rbd_obj_copyup_object_maps(obj_req); |
|
if (!obj_req->pending.num_pending) { |
|
*result = obj_req->pending.result; |
|
obj_req->copyup_state = RBD_OBJ_COPYUP_OBJECT_MAPS; |
|
goto again; |
|
} |
|
obj_req->copyup_state = __RBD_OBJ_COPYUP_OBJECT_MAPS; |
|
return false; |
|
case __RBD_OBJ_COPYUP_OBJECT_MAPS: |
|
if (!pending_result_dec(&obj_req->pending, result)) |
|
return false; |
|
fallthrough; |
|
case RBD_OBJ_COPYUP_OBJECT_MAPS: |
|
if (*result) { |
|
rbd_warn(rbd_dev, "snap object map update failed: %d", |
|
*result); |
|
return true; |
|
} |
|
|
|
rbd_obj_copyup_write_object(obj_req); |
|
if (!obj_req->pending.num_pending) { |
|
*result = obj_req->pending.result; |
|
obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; |
|
goto again; |
|
} |
|
obj_req->copyup_state = __RBD_OBJ_COPYUP_WRITE_OBJECT; |
|
return false; |
|
case __RBD_OBJ_COPYUP_WRITE_OBJECT: |
|
if (!pending_result_dec(&obj_req->pending, result)) |
|
return false; |
|
fallthrough; |
|
case RBD_OBJ_COPYUP_WRITE_OBJECT: |
|
return true; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* |
|
* Return: |
|
* 0 - object map update sent |
|
* 1 - object map update isn't needed |
|
* <0 - error |
|
*/ |
|
static int rbd_obj_write_post_object_map(struct rbd_obj_request *obj_req) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
u8 current_state = OBJECT_PENDING; |
|
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
|
return 1; |
|
|
|
if (!(obj_req->flags & RBD_OBJ_FLAG_DELETION)) |
|
return 1; |
|
|
|
return rbd_object_map_update(obj_req, CEPH_NOSNAP, OBJECT_NONEXISTENT, |
|
¤t_state); |
|
} |
|
|
|
static bool rbd_obj_advance_write(struct rbd_obj_request *obj_req, int *result) |
|
{ |
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
|
int ret; |
|
|
|
again: |
|
switch (obj_req->write_state) { |
|
case RBD_OBJ_WRITE_START: |
|
rbd_assert(!*result); |
|
|
|
if (rbd_obj_write_is_noop(obj_req)) |
|
return true; |
|
|
|
ret = rbd_obj_write_pre_object_map(obj_req); |
|
if (ret < 0) { |
|
*result = ret; |
|
return true; |
|
} |
|
obj_req->write_state = RBD_OBJ_WRITE_PRE_OBJECT_MAP; |
|
if (ret > 0) |
|
goto again; |
|
return false; |
|
case RBD_OBJ_WRITE_PRE_OBJECT_MAP: |
|
if (*result) { |
|
rbd_warn(rbd_dev, "pre object map update failed: %d", |
|
*result); |
|
return true; |
|
} |
|
ret = rbd_obj_write_object(obj_req); |
|
if (ret) { |
|
*result = ret; |
|
return true; |
|
} |
|
obj_req->write_state = RBD_OBJ_WRITE_OBJECT; |
|
return false; |
|
case RBD_OBJ_WRITE_OBJECT: |
|
if (*result == -ENOENT) { |
|
if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { |
|
*result = 0; |
|
obj_req->copyup_state = RBD_OBJ_COPYUP_START; |
|
obj_req->write_state = __RBD_OBJ_WRITE_COPYUP; |
|
goto again; |
|
} |
|
/* |
|
* On a non-existent object: |
|
* delete - -ENOENT, truncate/zero - 0 |
|
*/ |
|
if (obj_req->flags & RBD_OBJ_FLAG_DELETION) |
|
*result = 0; |
|
} |
|
if (*result) |
|
return true; |
|
|
|
obj_req->write_state = RBD_OBJ_WRITE_COPYUP; |
|
goto again; |
|
case __RBD_OBJ_WRITE_COPYUP: |
|
if (!rbd_obj_advance_copyup(obj_req, result)) |
|
return false; |
|
fallthrough; |
|
case RBD_OBJ_WRITE_COPYUP: |
|
if (*result) { |
|
rbd_warn(rbd_dev, "copyup failed: %d", *result); |
|
return true; |
|
} |
|
ret = rbd_obj_write_post_object_map(obj_req); |
|
if (ret < 0) { |
|
*result = ret; |
|
return true; |
|
} |
|
obj_req->write_state = RBD_OBJ_WRITE_POST_OBJECT_MAP; |
|
if (ret > 0) |
|
goto again; |
|
return false; |
|
case RBD_OBJ_WRITE_POST_OBJECT_MAP: |
|
if (*result) |
|
rbd_warn(rbd_dev, "post object map update failed: %d", |
|
*result); |
|
return true; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* |
|
* Return true if @obj_req is completed. |
|
*/ |
|
static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req, |
|
int *result) |
|
{ |
|
struct rbd_img_request *img_req = obj_req->img_request; |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
bool done; |
|
|
|
mutex_lock(&obj_req->state_mutex); |
|
if (!rbd_img_is_write(img_req)) |
|
done = rbd_obj_advance_read(obj_req, result); |
|
else |
|
done = rbd_obj_advance_write(obj_req, result); |
|
mutex_unlock(&obj_req->state_mutex); |
|
|
|
if (done && *result) { |
|
rbd_assert(*result < 0); |
|
rbd_warn(rbd_dev, "%s at objno %llu %llu~%llu result %d", |
|
obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
|
obj_req->ex.oe_off, obj_req->ex.oe_len, *result); |
|
} |
|
return done; |
|
} |
|
|
|
/* |
|
* This is open-coded in rbd_img_handle_request() to avoid parent chain |
|
* recursion. |
|
*/ |
|
static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result) |
|
{ |
|
if (__rbd_obj_handle_request(obj_req, &result)) |
|
rbd_img_handle_request(obj_req->img_request, result); |
|
} |
|
|
|
static bool need_exclusive_lock(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) |
|
return false; |
|
|
|
if (rbd_is_ro(rbd_dev)) |
|
return false; |
|
|
|
rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); |
|
if (rbd_dev->opts->lock_on_read || |
|
(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
|
return true; |
|
|
|
return rbd_img_is_write(img_req); |
|
} |
|
|
|
static bool rbd_lock_add_request(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
bool locked; |
|
|
|
lockdep_assert_held(&rbd_dev->lock_rwsem); |
|
locked = rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED; |
|
spin_lock(&rbd_dev->lock_lists_lock); |
|
rbd_assert(list_empty(&img_req->lock_item)); |
|
if (!locked) |
|
list_add_tail(&img_req->lock_item, &rbd_dev->acquiring_list); |
|
else |
|
list_add_tail(&img_req->lock_item, &rbd_dev->running_list); |
|
spin_unlock(&rbd_dev->lock_lists_lock); |
|
return locked; |
|
} |
|
|
|
static void rbd_lock_del_request(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
bool need_wakeup; |
|
|
|
lockdep_assert_held(&rbd_dev->lock_rwsem); |
|
spin_lock(&rbd_dev->lock_lists_lock); |
|
rbd_assert(!list_empty(&img_req->lock_item)); |
|
list_del_init(&img_req->lock_item); |
|
need_wakeup = (rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING && |
|
list_empty(&rbd_dev->running_list)); |
|
spin_unlock(&rbd_dev->lock_lists_lock); |
|
if (need_wakeup) |
|
complete(&rbd_dev->releasing_wait); |
|
} |
|
|
|
static int rbd_img_exclusive_lock(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
|
|
if (!need_exclusive_lock(img_req)) |
|
return 1; |
|
|
|
if (rbd_lock_add_request(img_req)) |
|
return 1; |
|
|
|
if (rbd_dev->opts->exclusive) { |
|
WARN_ON(1); /* lock got released? */ |
|
return -EROFS; |
|
} |
|
|
|
/* |
|
* Note the use of mod_delayed_work() in rbd_acquire_lock() |
|
* and cancel_delayed_work() in wake_lock_waiters(). |
|
*/ |
|
dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); |
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
|
return 0; |
|
} |
|
|
|
static void rbd_img_object_requests(struct rbd_img_request *img_req) |
|
{ |
|
struct rbd_obj_request *obj_req; |
|
|
|
rbd_assert(!img_req->pending.result && !img_req->pending.num_pending); |
|
|
|
for_each_obj_request(img_req, obj_req) { |
|
int result = 0; |
|
|
|
if (__rbd_obj_handle_request(obj_req, &result)) { |
|
if (result) { |
|
img_req->pending.result = result; |
|
return; |
|
} |
|
} else { |
|
img_req->pending.num_pending++; |
|
} |
|
} |
|
} |
|
|
|
static bool rbd_img_advance(struct rbd_img_request *img_req, int *result) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
int ret; |
|
|
|
again: |
|
switch (img_req->state) { |
|
case RBD_IMG_START: |
|
rbd_assert(!*result); |
|
|
|
ret = rbd_img_exclusive_lock(img_req); |
|
if (ret < 0) { |
|
*result = ret; |
|
return true; |
|
} |
|
img_req->state = RBD_IMG_EXCLUSIVE_LOCK; |
|
if (ret > 0) |
|
goto again; |
|
return false; |
|
case RBD_IMG_EXCLUSIVE_LOCK: |
|
if (*result) |
|
return true; |
|
|
|
rbd_assert(!need_exclusive_lock(img_req) || |
|
__rbd_is_lock_owner(rbd_dev)); |
|
|
|
rbd_img_object_requests(img_req); |
|
if (!img_req->pending.num_pending) { |
|
*result = img_req->pending.result; |
|
img_req->state = RBD_IMG_OBJECT_REQUESTS; |
|
goto again; |
|
} |
|
img_req->state = __RBD_IMG_OBJECT_REQUESTS; |
|
return false; |
|
case __RBD_IMG_OBJECT_REQUESTS: |
|
if (!pending_result_dec(&img_req->pending, result)) |
|
return false; |
|
fallthrough; |
|
case RBD_IMG_OBJECT_REQUESTS: |
|
return true; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* |
|
* Return true if @img_req is completed. |
|
*/ |
|
static bool __rbd_img_handle_request(struct rbd_img_request *img_req, |
|
int *result) |
|
{ |
|
struct rbd_device *rbd_dev = img_req->rbd_dev; |
|
bool done; |
|
|
|
if (need_exclusive_lock(img_req)) { |
|
down_read(&rbd_dev->lock_rwsem); |
|
mutex_lock(&img_req->state_mutex); |
|
done = rbd_img_advance(img_req, result); |
|
if (done) |
|
rbd_lock_del_request(img_req); |
|
mutex_unlock(&img_req->state_mutex); |
|
up_read(&rbd_dev->lock_rwsem); |
|
} else { |
|
mutex_lock(&img_req->state_mutex); |
|
done = rbd_img_advance(img_req, result); |
|
mutex_unlock(&img_req->state_mutex); |
|
} |
|
|
|
if (done && *result) { |
|
rbd_assert(*result < 0); |
|
rbd_warn(rbd_dev, "%s%s result %d", |
|
test_bit(IMG_REQ_CHILD, &img_req->flags) ? "child " : "", |
|
obj_op_name(img_req->op_type), *result); |
|
} |
|
return done; |
|
} |
|
|
|
static void rbd_img_handle_request(struct rbd_img_request *img_req, int result) |
|
{ |
|
again: |
|
if (!__rbd_img_handle_request(img_req, &result)) |
|
return; |
|
|
|
if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { |
|
struct rbd_obj_request *obj_req = img_req->obj_request; |
|
|
|
rbd_img_request_destroy(img_req); |
|
if (__rbd_obj_handle_request(obj_req, &result)) { |
|
img_req = obj_req->img_request; |
|
goto again; |
|
} |
|
} else { |
|
struct request *rq = blk_mq_rq_from_pdu(img_req); |
|
|
|
rbd_img_request_destroy(img_req); |
|
blk_mq_end_request(rq, errno_to_blk_status(result)); |
|
} |
|
} |
|
|
|
static const struct rbd_client_id rbd_empty_cid; |
|
|
|
static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
|
const struct rbd_client_id *rhs) |
|
{ |
|
return lhs->gid == rhs->gid && lhs->handle == rhs->handle; |
|
} |
|
|
|
static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_client_id cid; |
|
|
|
mutex_lock(&rbd_dev->watch_mutex); |
|
cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); |
|
cid.handle = rbd_dev->watch_cookie; |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
return cid; |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static void rbd_set_owner_cid(struct rbd_device *rbd_dev, |
|
const struct rbd_client_id *cid) |
|
{ |
|
dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, |
|
rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, |
|
cid->gid, cid->handle); |
|
rbd_dev->owner_cid = *cid; /* struct */ |
|
} |
|
|
|
static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) |
|
{ |
|
mutex_lock(&rbd_dev->watch_mutex); |
|
sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
} |
|
|
|
static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
|
{ |
|
struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
|
|
|
rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
|
strcpy(rbd_dev->lock_cookie, cookie); |
|
rbd_set_owner_cid(rbd_dev, &cid); |
|
queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static int rbd_lock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
char cookie[32]; |
|
int ret; |
|
|
|
WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
|
rbd_dev->lock_cookie[0] != '\0'); |
|
|
|
format_lock_cookie(rbd_dev, cookie); |
|
ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
|
RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, |
|
RBD_LOCK_TAG, "", 0); |
|
if (ret) |
|
return ret; |
|
|
|
__rbd_lock(rbd_dev, cookie); |
|
return 0; |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static void rbd_unlock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
int ret; |
|
|
|
WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
|
rbd_dev->lock_cookie[0] == '\0'); |
|
|
|
ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
|
RBD_LOCK_NAME, rbd_dev->lock_cookie); |
|
if (ret && ret != -ENOENT) |
|
rbd_warn(rbd_dev, "failed to unlock header: %d", ret); |
|
|
|
/* treat errors as the image is unlocked */ |
|
rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
|
rbd_dev->lock_cookie[0] = '\0'; |
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
|
queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); |
|
} |
|
|
|
static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
|
enum rbd_notify_op notify_op, |
|
struct page ***preply_pages, |
|
size_t *preply_len) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
|
char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
|
int buf_size = sizeof(buf); |
|
void *p = buf; |
|
|
|
dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
|
|
|
/* encode *LockPayload NotifyMessage (op + ClientId) */ |
|
ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); |
|
ceph_encode_32(&p, notify_op); |
|
ceph_encode_64(&p, cid.gid); |
|
ceph_encode_64(&p, cid.handle); |
|
|
|
return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, buf, buf_size, |
|
RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); |
|
} |
|
|
|
static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
|
enum rbd_notify_op notify_op) |
|
{ |
|
__rbd_notify_op_lock(rbd_dev, notify_op, NULL, NULL); |
|
} |
|
|
|
static void rbd_notify_acquired_lock(struct work_struct *work) |
|
{ |
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
|
acquired_lock_work); |
|
|
|
rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
|
} |
|
|
|
static void rbd_notify_released_lock(struct work_struct *work) |
|
{ |
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
|
released_lock_work); |
|
|
|
rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
|
} |
|
|
|
static int rbd_request_lock(struct rbd_device *rbd_dev) |
|
{ |
|
struct page **reply_pages; |
|
size_t reply_len; |
|
bool lock_owner_responded = false; |
|
int ret; |
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
|
&reply_pages, &reply_len); |
|
if (ret && ret != -ETIMEDOUT) { |
|
rbd_warn(rbd_dev, "failed to request lock: %d", ret); |
|
goto out; |
|
} |
|
|
|
if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
|
void *p = page_address(reply_pages[0]); |
|
void *const end = p + reply_len; |
|
u32 n; |
|
|
|
ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
|
while (n--) { |
|
u8 struct_v; |
|
u32 len; |
|
|
|
ceph_decode_need(&p, end, 8 + 8, e_inval); |
|
p += 8 + 8; /* skip gid and cookie */ |
|
|
|
ceph_decode_32_safe(&p, end, len, e_inval); |
|
if (!len) |
|
continue; |
|
|
|
if (lock_owner_responded) { |
|
rbd_warn(rbd_dev, |
|
"duplicate lock owners detected"); |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
lock_owner_responded = true; |
|
ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", |
|
&struct_v, &len); |
|
if (ret) { |
|
rbd_warn(rbd_dev, |
|
"failed to decode ResponseMessage: %d", |
|
ret); |
|
goto e_inval; |
|
} |
|
|
|
ret = ceph_decode_32(&p); |
|
} |
|
} |
|
|
|
if (!lock_owner_responded) { |
|
rbd_warn(rbd_dev, "no lock owners detected"); |
|
ret = -ETIMEDOUT; |
|
} |
|
|
|
out: |
|
ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); |
|
return ret; |
|
|
|
e_inval: |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
/* |
|
* Either image request state machine(s) or rbd_add_acquire_lock() |
|
* (i.e. "rbd map"). |
|
*/ |
|
static void wake_lock_waiters(struct rbd_device *rbd_dev, int result) |
|
{ |
|
struct rbd_img_request *img_req; |
|
|
|
dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); |
|
lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
|
|
|
cancel_delayed_work(&rbd_dev->lock_dwork); |
|
if (!completion_done(&rbd_dev->acquire_wait)) { |
|
rbd_assert(list_empty(&rbd_dev->acquiring_list) && |
|
list_empty(&rbd_dev->running_list)); |
|
rbd_dev->acquire_err = result; |
|
complete_all(&rbd_dev->acquire_wait); |
|
return; |
|
} |
|
|
|
list_for_each_entry(img_req, &rbd_dev->acquiring_list, lock_item) { |
|
mutex_lock(&img_req->state_mutex); |
|
rbd_assert(img_req->state == RBD_IMG_EXCLUSIVE_LOCK); |
|
rbd_img_schedule(img_req, result); |
|
mutex_unlock(&img_req->state_mutex); |
|
} |
|
|
|
list_splice_tail_init(&rbd_dev->acquiring_list, &rbd_dev->running_list); |
|
} |
|
|
|
static int get_lock_owner_info(struct rbd_device *rbd_dev, |
|
struct ceph_locker **lockers, u32 *num_lockers) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
u8 lock_type; |
|
char *lock_tag; |
|
int ret; |
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, RBD_LOCK_NAME, |
|
&lock_type, &lock_tag, lockers, num_lockers); |
|
if (ret) |
|
return ret; |
|
|
|
if (*num_lockers == 0) { |
|
dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); |
|
goto out; |
|
} |
|
|
|
if (strcmp(lock_tag, RBD_LOCK_TAG)) { |
|
rbd_warn(rbd_dev, "locked by external mechanism, tag %s", |
|
lock_tag); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
if (lock_type == CEPH_CLS_LOCK_SHARED) { |
|
rbd_warn(rbd_dev, "shared lock type detected"); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, |
|
strlen(RBD_LOCK_COOKIE_PREFIX))) { |
|
rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", |
|
(*lockers)[0].id.cookie); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
out: |
|
kfree(lock_tag); |
|
return ret; |
|
} |
|
|
|
static int find_watcher(struct rbd_device *rbd_dev, |
|
const struct ceph_locker *locker) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct ceph_watch_item *watchers; |
|
u32 num_watchers; |
|
u64 cookie; |
|
int i; |
|
int ret; |
|
|
|
ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, &watchers, |
|
&num_watchers); |
|
if (ret) |
|
return ret; |
|
|
|
sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); |
|
for (i = 0; i < num_watchers; i++) { |
|
/* |
|
* Ignore addr->type while comparing. This mimics |
|
* entity_addr_t::get_legacy_str() + strcmp(). |
|
*/ |
|
if (ceph_addr_equal_no_type(&watchers[i].addr, |
|
&locker->info.addr) && |
|
watchers[i].cookie == cookie) { |
|
struct rbd_client_id cid = { |
|
.gid = le64_to_cpu(watchers[i].name.num), |
|
.handle = cookie, |
|
}; |
|
|
|
dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, |
|
rbd_dev, cid.gid, cid.handle); |
|
rbd_set_owner_cid(rbd_dev, &cid); |
|
ret = 1; |
|
goto out; |
|
} |
|
} |
|
|
|
dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); |
|
ret = 0; |
|
out: |
|
kfree(watchers); |
|
return ret; |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static int rbd_try_lock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_client *client = rbd_dev->rbd_client->client; |
|
struct ceph_locker *lockers; |
|
u32 num_lockers; |
|
int ret; |
|
|
|
for (;;) { |
|
ret = rbd_lock(rbd_dev); |
|
if (ret != -EBUSY) |
|
return ret; |
|
|
|
/* determine if the current lock holder is still alive */ |
|
ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); |
|
if (ret) |
|
return ret; |
|
|
|
if (num_lockers == 0) |
|
goto again; |
|
|
|
ret = find_watcher(rbd_dev, lockers); |
|
if (ret) |
|
goto out; /* request lock or error */ |
|
|
|
rbd_warn(rbd_dev, "breaking header lock owned by %s%llu", |
|
ENTITY_NAME(lockers[0].id.name)); |
|
|
|
ret = ceph_monc_blocklist_add(&client->monc, |
|
&lockers[0].info.addr); |
|
if (ret) { |
|
rbd_warn(rbd_dev, "blocklist of %s%llu failed: %d", |
|
ENTITY_NAME(lockers[0].id.name), ret); |
|
goto out; |
|
} |
|
|
|
ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, RBD_LOCK_NAME, |
|
lockers[0].id.cookie, |
|
&lockers[0].id.name); |
|
if (ret && ret != -ENOENT) |
|
goto out; |
|
|
|
again: |
|
ceph_free_lockers(lockers, num_lockers); |
|
} |
|
|
|
out: |
|
ceph_free_lockers(lockers, num_lockers); |
|
return ret; |
|
} |
|
|
|
static int rbd_post_acquire_action(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) { |
|
ret = rbd_object_map_open(rbd_dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Return: |
|
* 0 - lock acquired |
|
* 1 - caller should call rbd_request_lock() |
|
* <0 - error |
|
*/ |
|
static int rbd_try_acquire_lock(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
down_read(&rbd_dev->lock_rwsem); |
|
dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, |
|
rbd_dev->lock_state); |
|
if (__rbd_is_lock_owner(rbd_dev)) { |
|
up_read(&rbd_dev->lock_rwsem); |
|
return 0; |
|
} |
|
|
|
up_read(&rbd_dev->lock_rwsem); |
|
down_write(&rbd_dev->lock_rwsem); |
|
dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, |
|
rbd_dev->lock_state); |
|
if (__rbd_is_lock_owner(rbd_dev)) { |
|
up_write(&rbd_dev->lock_rwsem); |
|
return 0; |
|
} |
|
|
|
ret = rbd_try_lock(rbd_dev); |
|
if (ret < 0) { |
|
rbd_warn(rbd_dev, "failed to lock header: %d", ret); |
|
if (ret == -EBLOCKLISTED) |
|
goto out; |
|
|
|
ret = 1; /* request lock anyway */ |
|
} |
|
if (ret > 0) { |
|
up_write(&rbd_dev->lock_rwsem); |
|
return ret; |
|
} |
|
|
|
rbd_assert(rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED); |
|
rbd_assert(list_empty(&rbd_dev->running_list)); |
|
|
|
ret = rbd_post_acquire_action(rbd_dev); |
|
if (ret) { |
|
rbd_warn(rbd_dev, "post-acquire action failed: %d", ret); |
|
/* |
|
* Can't stay in RBD_LOCK_STATE_LOCKED because |
|
* rbd_lock_add_request() would let the request through, |
|
* assuming that e.g. object map is locked and loaded. |
|
*/ |
|
rbd_unlock(rbd_dev); |
|
} |
|
|
|
out: |
|
wake_lock_waiters(rbd_dev, ret); |
|
up_write(&rbd_dev->lock_rwsem); |
|
return ret; |
|
} |
|
|
|
static void rbd_acquire_lock(struct work_struct *work) |
|
{ |
|
struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
|
struct rbd_device, lock_dwork); |
|
int ret; |
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
again: |
|
ret = rbd_try_acquire_lock(rbd_dev); |
|
if (ret <= 0) { |
|
dout("%s rbd_dev %p ret %d - done\n", __func__, rbd_dev, ret); |
|
return; |
|
} |
|
|
|
ret = rbd_request_lock(rbd_dev); |
|
if (ret == -ETIMEDOUT) { |
|
goto again; /* treat this as a dead client */ |
|
} else if (ret == -EROFS) { |
|
rbd_warn(rbd_dev, "peer will not release lock"); |
|
down_write(&rbd_dev->lock_rwsem); |
|
wake_lock_waiters(rbd_dev, ret); |
|
up_write(&rbd_dev->lock_rwsem); |
|
} else if (ret < 0) { |
|
rbd_warn(rbd_dev, "error requesting lock: %d", ret); |
|
mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
|
RBD_RETRY_DELAY); |
|
} else { |
|
/* |
|
* lock owner acked, but resend if we don't see them |
|
* release the lock |
|
*/ |
|
dout("%s rbd_dev %p requeuing lock_dwork\n", __func__, |
|
rbd_dev); |
|
mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
|
msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); |
|
} |
|
} |
|
|
|
static bool rbd_quiesce_lock(struct rbd_device *rbd_dev) |
|
{ |
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
|
|
|
if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) |
|
return false; |
|
|
|
/* |
|
* Ensure that all in-flight IO is flushed. |
|
*/ |
|
rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; |
|
rbd_assert(!completion_done(&rbd_dev->releasing_wait)); |
|
if (list_empty(&rbd_dev->running_list)) |
|
return true; |
|
|
|
up_write(&rbd_dev->lock_rwsem); |
|
wait_for_completion(&rbd_dev->releasing_wait); |
|
|
|
down_write(&rbd_dev->lock_rwsem); |
|
if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) |
|
return false; |
|
|
|
rbd_assert(list_empty(&rbd_dev->running_list)); |
|
return true; |
|
} |
|
|
|
static void rbd_pre_release_action(struct rbd_device *rbd_dev) |
|
{ |
|
if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) |
|
rbd_object_map_close(rbd_dev); |
|
} |
|
|
|
static void __rbd_release_lock(struct rbd_device *rbd_dev) |
|
{ |
|
rbd_assert(list_empty(&rbd_dev->running_list)); |
|
|
|
rbd_pre_release_action(rbd_dev); |
|
rbd_unlock(rbd_dev); |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static void rbd_release_lock(struct rbd_device *rbd_dev) |
|
{ |
|
if (!rbd_quiesce_lock(rbd_dev)) |
|
return; |
|
|
|
__rbd_release_lock(rbd_dev); |
|
|
|
/* |
|
* Give others a chance to grab the lock - we would re-acquire |
|
* almost immediately if we got new IO while draining the running |
|
* list otherwise. We need to ack our own notifications, so this |
|
* lock_dwork will be requeued from rbd_handle_released_lock() by |
|
* way of maybe_kick_acquire(). |
|
*/ |
|
cancel_delayed_work(&rbd_dev->lock_dwork); |
|
} |
|
|
|
static void rbd_release_lock_work(struct work_struct *work) |
|
{ |
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
|
unlock_work); |
|
|
|
down_write(&rbd_dev->lock_rwsem); |
|
rbd_release_lock(rbd_dev); |
|
up_write(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
static void maybe_kick_acquire(struct rbd_device *rbd_dev) |
|
{ |
|
bool have_requests; |
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
if (__rbd_is_lock_owner(rbd_dev)) |
|
return; |
|
|
|
spin_lock(&rbd_dev->lock_lists_lock); |
|
have_requests = !list_empty(&rbd_dev->acquiring_list); |
|
spin_unlock(&rbd_dev->lock_lists_lock); |
|
if (have_requests || delayed_work_pending(&rbd_dev->lock_dwork)) { |
|
dout("%s rbd_dev %p kicking lock_dwork\n", __func__, rbd_dev); |
|
mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
|
} |
|
} |
|
|
|
static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, |
|
void **p) |
|
{ |
|
struct rbd_client_id cid = { 0 }; |
|
|
|
if (struct_v >= 2) { |
|
cid.gid = ceph_decode_64(p); |
|
cid.handle = ceph_decode_64(p); |
|
} |
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
|
cid.handle); |
|
if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
|
down_write(&rbd_dev->lock_rwsem); |
|
if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
|
dout("%s rbd_dev %p cid %llu-%llu == owner_cid\n", |
|
__func__, rbd_dev, cid.gid, cid.handle); |
|
} else { |
|
rbd_set_owner_cid(rbd_dev, &cid); |
|
} |
|
downgrade_write(&rbd_dev->lock_rwsem); |
|
} else { |
|
down_read(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
maybe_kick_acquire(rbd_dev); |
|
up_read(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, |
|
void **p) |
|
{ |
|
struct rbd_client_id cid = { 0 }; |
|
|
|
if (struct_v >= 2) { |
|
cid.gid = ceph_decode_64(p); |
|
cid.handle = ceph_decode_64(p); |
|
} |
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
|
cid.handle); |
|
if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
|
down_write(&rbd_dev->lock_rwsem); |
|
if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
|
dout("%s rbd_dev %p cid %llu-%llu != owner_cid %llu-%llu\n", |
|
__func__, rbd_dev, cid.gid, cid.handle, |
|
rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); |
|
} else { |
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
|
} |
|
downgrade_write(&rbd_dev->lock_rwsem); |
|
} else { |
|
down_read(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
maybe_kick_acquire(rbd_dev); |
|
up_read(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
/* |
|
* Returns result for ResponseMessage to be encoded (<= 0), or 1 if no |
|
* ResponseMessage is needed. |
|
*/ |
|
static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, |
|
void **p) |
|
{ |
|
struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); |
|
struct rbd_client_id cid = { 0 }; |
|
int result = 1; |
|
|
|
if (struct_v >= 2) { |
|
cid.gid = ceph_decode_64(p); |
|
cid.handle = ceph_decode_64(p); |
|
} |
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
|
cid.handle); |
|
if (rbd_cid_equal(&cid, &my_cid)) |
|
return result; |
|
|
|
down_read(&rbd_dev->lock_rwsem); |
|
if (__rbd_is_lock_owner(rbd_dev)) { |
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && |
|
rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) |
|
goto out_unlock; |
|
|
|
/* |
|
* encode ResponseMessage(0) so the peer can detect |
|
* a missing owner |
|
*/ |
|
result = 0; |
|
|
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { |
|
if (!rbd_dev->opts->exclusive) { |
|
dout("%s rbd_dev %p queueing unlock_work\n", |
|
__func__, rbd_dev); |
|
queue_work(rbd_dev->task_wq, |
|
&rbd_dev->unlock_work); |
|
} else { |
|
/* refuse to release the lock */ |
|
result = -EROFS; |
|
} |
|
} |
|
} |
|
|
|
out_unlock: |
|
up_read(&rbd_dev->lock_rwsem); |
|
return result; |
|
} |
|
|
|
static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, |
|
u64 notify_id, u64 cookie, s32 *result) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
|
int buf_size = sizeof(buf); |
|
int ret; |
|
|
|
if (result) { |
|
void *p = buf; |
|
|
|
/* encode ResponseMessage */ |
|
ceph_start_encoding(&p, 1, 1, |
|
buf_size - CEPH_ENCODING_START_BLK_LEN); |
|
ceph_encode_32(&p, *result); |
|
} else { |
|
buf_size = 0; |
|
} |
|
|
|
ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, notify_id, cookie, |
|
buf, buf_size); |
|
if (ret) |
|
rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
|
} |
|
|
|
static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, |
|
u64 cookie) |
|
{ |
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); |
|
} |
|
|
|
static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, |
|
u64 notify_id, u64 cookie, s32 result) |
|
{ |
|
dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); |
|
__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); |
|
} |
|
|
|
static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, |
|
u64 notifier_id, void *data, size_t data_len) |
|
{ |
|
struct rbd_device *rbd_dev = arg; |
|
void *p = data; |
|
void *const end = p + data_len; |
|
u8 struct_v = 0; |
|
u32 len; |
|
u32 notify_op; |
|
int ret; |
|
|
|
dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", |
|
__func__, rbd_dev, cookie, notify_id, data_len); |
|
if (data_len) { |
|
ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", |
|
&struct_v, &len); |
|
if (ret) { |
|
rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", |
|
ret); |
|
return; |
|
} |
|
|
|
notify_op = ceph_decode_32(&p); |
|
} else { |
|
/* legacy notification for header updates */ |
|
notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; |
|
len = 0; |
|
} |
|
|
|
dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); |
|
switch (notify_op) { |
|
case RBD_NOTIFY_OP_ACQUIRED_LOCK: |
|
rbd_handle_acquired_lock(rbd_dev, struct_v, &p); |
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
|
break; |
|
case RBD_NOTIFY_OP_RELEASED_LOCK: |
|
rbd_handle_released_lock(rbd_dev, struct_v, &p); |
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
|
break; |
|
case RBD_NOTIFY_OP_REQUEST_LOCK: |
|
ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
|
if (ret <= 0) |
|
rbd_acknowledge_notify_result(rbd_dev, notify_id, |
|
cookie, ret); |
|
else |
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
|
break; |
|
case RBD_NOTIFY_OP_HEADER_UPDATE: |
|
ret = rbd_dev_refresh(rbd_dev); |
|
if (ret) |
|
rbd_warn(rbd_dev, "refresh failed: %d", ret); |
|
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
|
break; |
|
default: |
|
if (rbd_is_lock_owner(rbd_dev)) |
|
rbd_acknowledge_notify_result(rbd_dev, notify_id, |
|
cookie, -EOPNOTSUPP); |
|
else |
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
|
break; |
|
} |
|
} |
|
|
|
static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
|
|
|
static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
|
{ |
|
struct rbd_device *rbd_dev = arg; |
|
|
|
rbd_warn(rbd_dev, "encountered watch error: %d", err); |
|
|
|
down_write(&rbd_dev->lock_rwsem); |
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
|
up_write(&rbd_dev->lock_rwsem); |
|
|
|
mutex_lock(&rbd_dev->watch_mutex); |
|
if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { |
|
__rbd_unregister_watch(rbd_dev); |
|
rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; |
|
|
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
|
} |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
} |
|
|
|
/* |
|
* watch_mutex must be locked |
|
*/ |
|
static int __rbd_register_watch(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct ceph_osd_linger_request *handle; |
|
|
|
rbd_assert(!rbd_dev->watch_handle); |
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, rbd_watch_cb, |
|
rbd_watch_errcb, rbd_dev); |
|
if (IS_ERR(handle)) |
|
return PTR_ERR(handle); |
|
|
|
rbd_dev->watch_handle = handle; |
|
return 0; |
|
} |
|
|
|
/* |
|
* watch_mutex must be locked |
|
*/ |
|
static void __rbd_unregister_watch(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
int ret; |
|
|
|
rbd_assert(rbd_dev->watch_handle); |
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
|
if (ret) |
|
rbd_warn(rbd_dev, "failed to unwatch: %d", ret); |
|
|
|
rbd_dev->watch_handle = NULL; |
|
} |
|
|
|
static int rbd_register_watch(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&rbd_dev->watch_mutex); |
|
rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); |
|
ret = __rbd_register_watch(rbd_dev); |
|
if (ret) |
|
goto out; |
|
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
|
rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
|
|
|
out: |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
return ret; |
|
} |
|
|
|
static void cancel_tasks_sync(struct rbd_device *rbd_dev) |
|
{ |
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
cancel_work_sync(&rbd_dev->acquired_lock_work); |
|
cancel_work_sync(&rbd_dev->released_lock_work); |
|
cancel_delayed_work_sync(&rbd_dev->lock_dwork); |
|
cancel_work_sync(&rbd_dev->unlock_work); |
|
} |
|
|
|
/* |
|
* header_rwsem must not be held to avoid a deadlock with |
|
* rbd_dev_refresh() when flushing notifies. |
|
*/ |
|
static void rbd_unregister_watch(struct rbd_device *rbd_dev) |
|
{ |
|
cancel_tasks_sync(rbd_dev); |
|
|
|
mutex_lock(&rbd_dev->watch_mutex); |
|
if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) |
|
__rbd_unregister_watch(rbd_dev); |
|
rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
|
|
cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
|
ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
|
} |
|
|
|
/* |
|
* lock_rwsem must be held for write |
|
*/ |
|
static void rbd_reacquire_lock(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
char cookie[32]; |
|
int ret; |
|
|
|
if (!rbd_quiesce_lock(rbd_dev)) |
|
return; |
|
|
|
format_lock_cookie(rbd_dev, cookie); |
|
ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, RBD_LOCK_NAME, |
|
CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, |
|
RBD_LOCK_TAG, cookie); |
|
if (ret) { |
|
if (ret != -EOPNOTSUPP) |
|
rbd_warn(rbd_dev, "failed to update lock cookie: %d", |
|
ret); |
|
|
|
/* |
|
* Lock cookie cannot be updated on older OSDs, so do |
|
* a manual release and queue an acquire. |
|
*/ |
|
__rbd_release_lock(rbd_dev); |
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
|
} else { |
|
__rbd_lock(rbd_dev, cookie); |
|
wake_lock_waiters(rbd_dev, 0); |
|
} |
|
} |
|
|
|
static void rbd_reregister_watch(struct work_struct *work) |
|
{ |
|
struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
|
struct rbd_device, watch_dwork); |
|
int ret; |
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev); |
|
|
|
mutex_lock(&rbd_dev->watch_mutex); |
|
if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
return; |
|
} |
|
|
|
ret = __rbd_register_watch(rbd_dev); |
|
if (ret) { |
|
rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); |
|
if (ret != -EBLOCKLISTED && ret != -ENOENT) { |
|
queue_delayed_work(rbd_dev->task_wq, |
|
&rbd_dev->watch_dwork, |
|
RBD_RETRY_DELAY); |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
return; |
|
} |
|
|
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
down_write(&rbd_dev->lock_rwsem); |
|
wake_lock_waiters(rbd_dev, ret); |
|
up_write(&rbd_dev->lock_rwsem); |
|
return; |
|
} |
|
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
|
rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
|
mutex_unlock(&rbd_dev->watch_mutex); |
|
|
|
down_write(&rbd_dev->lock_rwsem); |
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) |
|
rbd_reacquire_lock(rbd_dev); |
|
up_write(&rbd_dev->lock_rwsem); |
|
|
|
ret = rbd_dev_refresh(rbd_dev); |
|
if (ret) |
|
rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
|
} |
|
|
|
/* |
|
* Synchronous osd object method call. Returns the number of bytes |
|
* returned in the outbound buffer, or a negative error code. |
|
*/ |
|
static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
|
struct ceph_object_id *oid, |
|
struct ceph_object_locator *oloc, |
|
const char *method_name, |
|
const void *outbound, |
|
size_t outbound_size, |
|
void *inbound, |
|
size_t inbound_size) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct page *req_page = NULL; |
|
struct page *reply_page; |
|
int ret; |
|
|
|
/* |
|
* Method calls are ultimately read operations. The result |
|
* should placed into the inbound buffer provided. They |
|
* also supply outbound data--parameters for the object |
|
* method. Currently if this is present it will be a |
|
* snapshot id. |
|
*/ |
|
if (outbound) { |
|
if (outbound_size > PAGE_SIZE) |
|
return -E2BIG; |
|
|
|
req_page = alloc_page(GFP_KERNEL); |
|
if (!req_page) |
|
return -ENOMEM; |
|
|
|
memcpy(page_address(req_page), outbound, outbound_size); |
|
} |
|
|
|
reply_page = alloc_page(GFP_KERNEL); |
|
if (!reply_page) { |
|
if (req_page) |
|
__free_page(req_page); |
|
return -ENOMEM; |
|
} |
|
|
|
ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
|
CEPH_OSD_FLAG_READ, req_page, outbound_size, |
|
&reply_page, &inbound_size); |
|
if (!ret) { |
|
memcpy(inbound, page_address(reply_page), inbound_size); |
|
ret = inbound_size; |
|
} |
|
|
|
if (req_page) |
|
__free_page(req_page); |
|
__free_page(reply_page); |
|
return ret; |
|
} |
|
|
|
static void rbd_queue_workfn(struct work_struct *work) |
|
{ |
|
struct rbd_img_request *img_request = |
|
container_of(work, struct rbd_img_request, work); |
|
struct rbd_device *rbd_dev = img_request->rbd_dev; |
|
enum obj_operation_type op_type = img_request->op_type; |
|
struct request *rq = blk_mq_rq_from_pdu(img_request); |
|
u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
|
u64 length = blk_rq_bytes(rq); |
|
u64 mapping_size; |
|
int result; |
|
|
|
/* Ignore/skip any zero-length requests */ |
|
if (!length) { |
|
dout("%s: zero-length request\n", __func__); |
|
result = 0; |
|
goto err_img_request; |
|
} |
|
|
|
blk_mq_start_request(rq); |
|
|
|
down_read(&rbd_dev->header_rwsem); |
|
mapping_size = rbd_dev->mapping.size; |
|
rbd_img_capture_header(img_request); |
|
up_read(&rbd_dev->header_rwsem); |
|
|
|
if (offset + length > mapping_size) { |
|
rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
|
length, mapping_size); |
|
result = -EIO; |
|
goto err_img_request; |
|
} |
|
|
|
dout("%s rbd_dev %p img_req %p %s %llu~%llu\n", __func__, rbd_dev, |
|
img_request, obj_op_name(op_type), offset, length); |
|
|
|
if (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_ZEROOUT) |
|
result = rbd_img_fill_nodata(img_request, offset, length); |
|
else |
|
result = rbd_img_fill_from_bio(img_request, offset, length, |
|
rq->bio); |
|
if (result) |
|
goto err_img_request; |
|
|
|
rbd_img_handle_request(img_request, 0); |
|
return; |
|
|
|
err_img_request: |
|
rbd_img_request_destroy(img_request); |
|
if (result) |
|
rbd_warn(rbd_dev, "%s %llx at %llx result %d", |
|
obj_op_name(op_type), length, offset, result); |
|
blk_mq_end_request(rq, errno_to_blk_status(result)); |
|
} |
|
|
|
static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
|
const struct blk_mq_queue_data *bd) |
|
{ |
|
struct rbd_device *rbd_dev = hctx->queue->queuedata; |
|
struct rbd_img_request *img_req = blk_mq_rq_to_pdu(bd->rq); |
|
enum obj_operation_type op_type; |
|
|
|
switch (req_op(bd->rq)) { |
|
case REQ_OP_DISCARD: |
|
op_type = OBJ_OP_DISCARD; |
|
break; |
|
case REQ_OP_WRITE_ZEROES: |
|
op_type = OBJ_OP_ZEROOUT; |
|
break; |
|
case REQ_OP_WRITE: |
|
op_type = OBJ_OP_WRITE; |
|
break; |
|
case REQ_OP_READ: |
|
op_type = OBJ_OP_READ; |
|
break; |
|
default: |
|
rbd_warn(rbd_dev, "unknown req_op %d", req_op(bd->rq)); |
|
return BLK_STS_IOERR; |
|
} |
|
|
|
rbd_img_request_init(img_req, rbd_dev, op_type); |
|
|
|
if (rbd_img_is_write(img_req)) { |
|
if (rbd_is_ro(rbd_dev)) { |
|
rbd_warn(rbd_dev, "%s on read-only mapping", |
|
obj_op_name(img_req->op_type)); |
|
return BLK_STS_IOERR; |
|
} |
|
rbd_assert(!rbd_is_snap(rbd_dev)); |
|
} |
|
|
|
INIT_WORK(&img_req->work, rbd_queue_workfn); |
|
queue_work(rbd_wq, &img_req->work); |
|
return BLK_STS_OK; |
|
} |
|
|
|
static void rbd_free_disk(struct rbd_device *rbd_dev) |
|
{ |
|
blk_cleanup_disk(rbd_dev->disk); |
|
blk_mq_free_tag_set(&rbd_dev->tag_set); |
|
rbd_dev->disk = NULL; |
|
} |
|
|
|
static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
|
struct ceph_object_id *oid, |
|
struct ceph_object_locator *oloc, |
|
void *buf, int buf_len) |
|
|
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct ceph_osd_request *req; |
|
struct page **pages; |
|
int num_pages = calc_pages_for(0, buf_len); |
|
int ret; |
|
|
|
req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
|
if (!req) |
|
return -ENOMEM; |
|
|
|
ceph_oid_copy(&req->r_base_oid, oid); |
|
ceph_oloc_copy(&req->r_base_oloc, oloc); |
|
req->r_flags = CEPH_OSD_FLAG_READ; |
|
|
|
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
|
if (IS_ERR(pages)) { |
|
ret = PTR_ERR(pages); |
|
goto out_req; |
|
} |
|
|
|
osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
|
osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, |
|
true); |
|
|
|
ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
|
if (ret) |
|
goto out_req; |
|
|
|
ceph_osdc_start_request(osdc, req, false); |
|
ret = ceph_osdc_wait_request(osdc, req); |
|
if (ret >= 0) |
|
ceph_copy_from_page_vector(pages, buf, 0, ret); |
|
|
|
out_req: |
|
ceph_osdc_put_request(req); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Read the complete header for the given rbd device. On successful |
|
* return, the rbd_dev->header field will contain up-to-date |
|
* information about the image. |
|
*/ |
|
static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_image_header_ondisk *ondisk = NULL; |
|
u32 snap_count = 0; |
|
u64 names_size = 0; |
|
u32 want_count; |
|
int ret; |
|
|
|
/* |
|
* The complete header will include an array of its 64-bit |
|
* snapshot ids, followed by the names of those snapshots as |
|
* a contiguous block of NUL-terminated strings. Note that |
|
* the number of snapshots could change by the time we read |
|
* it in, in which case we re-read it. |
|
*/ |
|
do { |
|
size_t size; |
|
|
|
kfree(ondisk); |
|
|
|
size = sizeof (*ondisk); |
|
size += snap_count * sizeof (struct rbd_image_snap_ondisk); |
|
size += names_size; |
|
ondisk = kmalloc(size, GFP_KERNEL); |
|
if (!ondisk) |
|
return -ENOMEM; |
|
|
|
ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, ondisk, size); |
|
if (ret < 0) |
|
goto out; |
|
if ((size_t)ret < size) { |
|
ret = -ENXIO; |
|
rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
|
size, ret); |
|
goto out; |
|
} |
|
if (!rbd_dev_ondisk_valid(ondisk)) { |
|
ret = -ENXIO; |
|
rbd_warn(rbd_dev, "invalid header"); |
|
goto out; |
|
} |
|
|
|
names_size = le64_to_cpu(ondisk->snap_names_len); |
|
want_count = snap_count; |
|
snap_count = le32_to_cpu(ondisk->snap_count); |
|
} while (snap_count != want_count); |
|
|
|
ret = rbd_header_from_disk(rbd_dev, ondisk); |
|
out: |
|
kfree(ondisk); |
|
|
|
return ret; |
|
} |
|
|
|
static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
|
{ |
|
sector_t size; |
|
|
|
/* |
|
* If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
|
* try to update its size. If REMOVING is set, updating size |
|
* is just useless work since the device can't be opened. |
|
*/ |
|
if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
|
!test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { |
|
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
|
dout("setting size to %llu sectors", (unsigned long long)size); |
|
set_capacity_and_notify(rbd_dev->disk, size); |
|
} |
|
} |
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
|
{ |
|
u64 mapping_size; |
|
int ret; |
|
|
|
down_write(&rbd_dev->header_rwsem); |
|
mapping_size = rbd_dev->mapping.size; |
|
|
|
ret = rbd_dev_header_info(rbd_dev); |
|
if (ret) |
|
goto out; |
|
|
|
/* |
|
* If there is a parent, see if it has disappeared due to the |
|
* mapped image getting flattened. |
|
*/ |
|
if (rbd_dev->parent) { |
|
ret = rbd_dev_v2_parent_info(rbd_dev); |
|
if (ret) |
|
goto out; |
|
} |
|
|
|
rbd_assert(!rbd_is_snap(rbd_dev)); |
|
rbd_dev->mapping.size = rbd_dev->header.image_size; |
|
|
|
out: |
|
up_write(&rbd_dev->header_rwsem); |
|
if (!ret && mapping_size != rbd_dev->mapping.size) |
|
rbd_dev_update_size(rbd_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static const struct blk_mq_ops rbd_mq_ops = { |
|
.queue_rq = rbd_queue_rq, |
|
}; |
|
|
|
static int rbd_init_disk(struct rbd_device *rbd_dev) |
|
{ |
|
struct gendisk *disk; |
|
struct request_queue *q; |
|
unsigned int objset_bytes = |
|
rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; |
|
int err; |
|
|
|
memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
|
rbd_dev->tag_set.ops = &rbd_mq_ops; |
|
rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
|
rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
|
rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
|
rbd_dev->tag_set.nr_hw_queues = num_present_cpus(); |
|
rbd_dev->tag_set.cmd_size = sizeof(struct rbd_img_request); |
|
|
|
err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); |
|
if (err) |
|
return err; |
|
|
|
disk = blk_mq_alloc_disk(&rbd_dev->tag_set, rbd_dev); |
|
if (IS_ERR(disk)) { |
|
err = PTR_ERR(disk); |
|
goto out_tag_set; |
|
} |
|
q = disk->queue; |
|
|
|
snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
|
rbd_dev->dev_id); |
|
disk->major = rbd_dev->major; |
|
disk->first_minor = rbd_dev->minor; |
|
if (single_major) { |
|
disk->minors = (1 << RBD_SINGLE_MAJOR_PART_SHIFT); |
|
disk->flags |= GENHD_FL_EXT_DEVT; |
|
} else { |
|
disk->minors = RBD_MINORS_PER_MAJOR; |
|
} |
|
disk->fops = &rbd_bd_ops; |
|
disk->private_data = rbd_dev; |
|
|
|
blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
|
/* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
|
|
|
blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
|
q->limits.max_sectors = queue_max_hw_sectors(q); |
|
blk_queue_max_segments(q, USHRT_MAX); |
|
blk_queue_max_segment_size(q, UINT_MAX); |
|
blk_queue_io_min(q, rbd_dev->opts->alloc_size); |
|
blk_queue_io_opt(q, rbd_dev->opts->alloc_size); |
|
|
|
if (rbd_dev->opts->trim) { |
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); |
|
q->limits.discard_granularity = rbd_dev->opts->alloc_size; |
|
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); |
|
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); |
|
} |
|
|
|
if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
|
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q); |
|
|
|
rbd_dev->disk = disk; |
|
|
|
return 0; |
|
out_tag_set: |
|
blk_mq_free_tag_set(&rbd_dev->tag_set); |
|
return err; |
|
} |
|
|
|
/* |
|
sysfs |
|
*/ |
|
|
|
static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
|
{ |
|
return container_of(dev, struct rbd_device, dev); |
|
} |
|
|
|
static ssize_t rbd_size_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%llu\n", |
|
(unsigned long long)rbd_dev->mapping.size); |
|
} |
|
|
|
static ssize_t rbd_features_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "0x%016llx\n", rbd_dev->header.features); |
|
} |
|
|
|
static ssize_t rbd_major_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
if (rbd_dev->major) |
|
return sprintf(buf, "%d\n", rbd_dev->major); |
|
|
|
return sprintf(buf, "(none)\n"); |
|
} |
|
|
|
static ssize_t rbd_minor_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%d\n", rbd_dev->minor); |
|
} |
|
|
|
static ssize_t rbd_client_addr_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
struct ceph_entity_addr *client_addr = |
|
ceph_client_addr(rbd_dev->rbd_client->client); |
|
|
|
return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, |
|
le32_to_cpu(client_addr->nonce)); |
|
} |
|
|
|
static ssize_t rbd_client_id_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "client%lld\n", |
|
ceph_client_gid(rbd_dev->rbd_client->client)); |
|
} |
|
|
|
static ssize_t rbd_cluster_fsid_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); |
|
} |
|
|
|
static ssize_t rbd_config_info_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
return sprintf(buf, "%s\n", rbd_dev->config_info); |
|
} |
|
|
|
static ssize_t rbd_pool_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
|
} |
|
|
|
static ssize_t rbd_pool_id_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%llu\n", |
|
(unsigned long long) rbd_dev->spec->pool_id); |
|
} |
|
|
|
static ssize_t rbd_pool_ns_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->pool_ns ?: ""); |
|
} |
|
|
|
static ssize_t rbd_name_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
if (rbd_dev->spec->image_name) |
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_name); |
|
|
|
return sprintf(buf, "(unknown)\n"); |
|
} |
|
|
|
static ssize_t rbd_image_id_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
|
} |
|
|
|
/* |
|
* Shows the name of the currently-mapped snapshot (or |
|
* RBD_SNAP_HEAD_NAME for the base image). |
|
*/ |
|
static ssize_t rbd_snap_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
|
} |
|
|
|
static ssize_t rbd_snap_id_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
|
|
return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); |
|
} |
|
|
|
/* |
|
* For a v2 image, shows the chain of parent images, separated by empty |
|
* lines. For v1 images or if there is no parent, shows "(no parent |
|
* image)". |
|
*/ |
|
static ssize_t rbd_parent_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
ssize_t count = 0; |
|
|
|
if (!rbd_dev->parent) |
|
return sprintf(buf, "(no parent image)\n"); |
|
|
|
for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
|
struct rbd_spec *spec = rbd_dev->parent_spec; |
|
|
|
count += sprintf(&buf[count], "%s" |
|
"pool_id %llu\npool_name %s\n" |
|
"pool_ns %s\n" |
|
"image_id %s\nimage_name %s\n" |
|
"snap_id %llu\nsnap_name %s\n" |
|
"overlap %llu\n", |
|
!count ? "" : "\n", /* first? */ |
|
spec->pool_id, spec->pool_name, |
|
spec->pool_ns ?: "", |
|
spec->image_id, spec->image_name ?: "(unknown)", |
|
spec->snap_id, spec->snap_name, |
|
rbd_dev->parent_overlap); |
|
} |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t rbd_image_refresh(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, |
|
size_t size) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
int ret; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
ret = rbd_dev_refresh(rbd_dev); |
|
if (ret) |
|
return ret; |
|
|
|
return size; |
|
} |
|
|
|
static DEVICE_ATTR(size, 0444, rbd_size_show, NULL); |
|
static DEVICE_ATTR(features, 0444, rbd_features_show, NULL); |
|
static DEVICE_ATTR(major, 0444, rbd_major_show, NULL); |
|
static DEVICE_ATTR(minor, 0444, rbd_minor_show, NULL); |
|
static DEVICE_ATTR(client_addr, 0444, rbd_client_addr_show, NULL); |
|
static DEVICE_ATTR(client_id, 0444, rbd_client_id_show, NULL); |
|
static DEVICE_ATTR(cluster_fsid, 0444, rbd_cluster_fsid_show, NULL); |
|
static DEVICE_ATTR(config_info, 0400, rbd_config_info_show, NULL); |
|
static DEVICE_ATTR(pool, 0444, rbd_pool_show, NULL); |
|
static DEVICE_ATTR(pool_id, 0444, rbd_pool_id_show, NULL); |
|
static DEVICE_ATTR(pool_ns, 0444, rbd_pool_ns_show, NULL); |
|
static DEVICE_ATTR(name, 0444, rbd_name_show, NULL); |
|
static DEVICE_ATTR(image_id, 0444, rbd_image_id_show, NULL); |
|
static DEVICE_ATTR(refresh, 0200, NULL, rbd_image_refresh); |
|
static DEVICE_ATTR(current_snap, 0444, rbd_snap_show, NULL); |
|
static DEVICE_ATTR(snap_id, 0444, rbd_snap_id_show, NULL); |
|
static DEVICE_ATTR(parent, 0444, rbd_parent_show, NULL); |
|
|
|
static struct attribute *rbd_attrs[] = { |
|
&dev_attr_size.attr, |
|
&dev_attr_features.attr, |
|
&dev_attr_major.attr, |
|
&dev_attr_minor.attr, |
|
&dev_attr_client_addr.attr, |
|
&dev_attr_client_id.attr, |
|
&dev_attr_cluster_fsid.attr, |
|
&dev_attr_config_info.attr, |
|
&dev_attr_pool.attr, |
|
&dev_attr_pool_id.attr, |
|
&dev_attr_pool_ns.attr, |
|
&dev_attr_name.attr, |
|
&dev_attr_image_id.attr, |
|
&dev_attr_current_snap.attr, |
|
&dev_attr_snap_id.attr, |
|
&dev_attr_parent.attr, |
|
&dev_attr_refresh.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute_group rbd_attr_group = { |
|
.attrs = rbd_attrs, |
|
}; |
|
|
|
static const struct attribute_group *rbd_attr_groups[] = { |
|
&rbd_attr_group, |
|
NULL |
|
}; |
|
|
|
static void rbd_dev_release(struct device *dev); |
|
|
|
static const struct device_type rbd_device_type = { |
|
.name = "rbd", |
|
.groups = rbd_attr_groups, |
|
.release = rbd_dev_release, |
|
}; |
|
|
|
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
|
{ |
|
kref_get(&spec->kref); |
|
|
|
return spec; |
|
} |
|
|
|
static void rbd_spec_free(struct kref *kref); |
|
static void rbd_spec_put(struct rbd_spec *spec) |
|
{ |
|
if (spec) |
|
kref_put(&spec->kref, rbd_spec_free); |
|
} |
|
|
|
static struct rbd_spec *rbd_spec_alloc(void) |
|
{ |
|
struct rbd_spec *spec; |
|
|
|
spec = kzalloc(sizeof (*spec), GFP_KERNEL); |
|
if (!spec) |
|
return NULL; |
|
|
|
spec->pool_id = CEPH_NOPOOL; |
|
spec->snap_id = CEPH_NOSNAP; |
|
kref_init(&spec->kref); |
|
|
|
return spec; |
|
} |
|
|
|
static void rbd_spec_free(struct kref *kref) |
|
{ |
|
struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); |
|
|
|
kfree(spec->pool_name); |
|
kfree(spec->pool_ns); |
|
kfree(spec->image_id); |
|
kfree(spec->image_name); |
|
kfree(spec->snap_name); |
|
kfree(spec); |
|
} |
|
|
|
static void rbd_dev_free(struct rbd_device *rbd_dev) |
|
{ |
|
WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
|
WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
|
|
|
ceph_oid_destroy(&rbd_dev->header_oid); |
|
ceph_oloc_destroy(&rbd_dev->header_oloc); |
|
kfree(rbd_dev->config_info); |
|
|
|
rbd_put_client(rbd_dev->rbd_client); |
|
rbd_spec_put(rbd_dev->spec); |
|
kfree(rbd_dev->opts); |
|
kfree(rbd_dev); |
|
} |
|
|
|
static void rbd_dev_release(struct device *dev) |
|
{ |
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
|
bool need_put = !!rbd_dev->opts; |
|
|
|
if (need_put) { |
|
destroy_workqueue(rbd_dev->task_wq); |
|
ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
|
} |
|
|
|
rbd_dev_free(rbd_dev); |
|
|
|
/* |
|
* This is racy, but way better than putting module outside of |
|
* the release callback. The race window is pretty small, so |
|
* doing something similar to dm (dm-builtin.c) is overkill. |
|
*/ |
|
if (need_put) |
|
module_put(THIS_MODULE); |
|
} |
|
|
|
static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
|
struct rbd_spec *spec) |
|
{ |
|
struct rbd_device *rbd_dev; |
|
|
|
rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
|
if (!rbd_dev) |
|
return NULL; |
|
|
|
spin_lock_init(&rbd_dev->lock); |
|
INIT_LIST_HEAD(&rbd_dev->node); |
|
init_rwsem(&rbd_dev->header_rwsem); |
|
|
|
rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
|
ceph_oid_init(&rbd_dev->header_oid); |
|
rbd_dev->header_oloc.pool = spec->pool_id; |
|
if (spec->pool_ns) { |
|
WARN_ON(!*spec->pool_ns); |
|
rbd_dev->header_oloc.pool_ns = |
|
ceph_find_or_create_string(spec->pool_ns, |
|
strlen(spec->pool_ns)); |
|
} |
|
|
|
mutex_init(&rbd_dev->watch_mutex); |
|
rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
|
INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); |
|
|
|
init_rwsem(&rbd_dev->lock_rwsem); |
|
rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
|
INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); |
|
INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); |
|
INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); |
|
INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); |
|
spin_lock_init(&rbd_dev->lock_lists_lock); |
|
INIT_LIST_HEAD(&rbd_dev->acquiring_list); |
|
INIT_LIST_HEAD(&rbd_dev->running_list); |
|
init_completion(&rbd_dev->acquire_wait); |
|
init_completion(&rbd_dev->releasing_wait); |
|
|
|
spin_lock_init(&rbd_dev->object_map_lock); |
|
|
|
rbd_dev->dev.bus = &rbd_bus_type; |
|
rbd_dev->dev.type = &rbd_device_type; |
|
rbd_dev->dev.parent = &rbd_root_dev; |
|
device_initialize(&rbd_dev->dev); |
|
|
|
rbd_dev->rbd_client = rbdc; |
|
rbd_dev->spec = spec; |
|
|
|
return rbd_dev; |
|
} |
|
|
|
/* |
|
* Create a mapping rbd_dev. |
|
*/ |
|
static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
|
struct rbd_spec *spec, |
|
struct rbd_options *opts) |
|
{ |
|
struct rbd_device *rbd_dev; |
|
|
|
rbd_dev = __rbd_dev_create(rbdc, spec); |
|
if (!rbd_dev) |
|
return NULL; |
|
|
|
rbd_dev->opts = opts; |
|
|
|
/* get an id and fill in device name */ |
|
rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, |
|
minor_to_rbd_dev_id(1 << MINORBITS), |
|
GFP_KERNEL); |
|
if (rbd_dev->dev_id < 0) |
|
goto fail_rbd_dev; |
|
|
|
sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); |
|
rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, |
|
rbd_dev->name); |
|
if (!rbd_dev->task_wq) |
|
goto fail_dev_id; |
|
|
|
/* we have a ref from do_rbd_add() */ |
|
__module_get(THIS_MODULE); |
|
|
|
dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
|
return rbd_dev; |
|
|
|
fail_dev_id: |
|
ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
|
fail_rbd_dev: |
|
rbd_dev_free(rbd_dev); |
|
return NULL; |
|
} |
|
|
|
static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
|
{ |
|
if (rbd_dev) |
|
put_device(&rbd_dev->dev); |
|
} |
|
|
|
/* |
|
* Get the size and object order for an image snapshot, or if |
|
* snap_id is CEPH_NOSNAP, gets this information for the base |
|
* image. |
|
*/ |
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
|
u8 *order, u64 *snap_size) |
|
{ |
|
__le64 snapid = cpu_to_le64(snap_id); |
|
int ret; |
|
struct { |
|
u8 order; |
|
__le64 size; |
|
} __attribute__ ((packed)) size_buf = { 0 }; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_size", |
|
&snapid, sizeof(snapid), |
|
&size_buf, sizeof(size_buf)); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) |
|
return ret; |
|
if (ret < sizeof (size_buf)) |
|
return -ERANGE; |
|
|
|
if (order) { |
|
*order = size_buf.order; |
|
dout(" order %u", (unsigned int)*order); |
|
} |
|
*snap_size = le64_to_cpu(size_buf.size); |
|
|
|
dout(" snap_id 0x%016llx snap_size = %llu\n", |
|
(unsigned long long)snap_id, |
|
(unsigned long long)*snap_size); |
|
|
|
return 0; |
|
} |
|
|
|
static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) |
|
{ |
|
return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, |
|
&rbd_dev->header.obj_order, |
|
&rbd_dev->header.image_size); |
|
} |
|
|
|
static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
|
{ |
|
size_t size; |
|
void *reply_buf; |
|
int ret; |
|
void *p; |
|
|
|
/* Response will be an encoded string, which includes a length */ |
|
size = sizeof(__le32) + RBD_OBJ_PREFIX_LEN_MAX; |
|
reply_buf = kzalloc(size, GFP_KERNEL); |
|
if (!reply_buf) |
|
return -ENOMEM; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_object_prefix", |
|
NULL, 0, reply_buf, size); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) |
|
goto out; |
|
|
|
p = reply_buf; |
|
rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
|
p + ret, NULL, GFP_NOIO); |
|
ret = 0; |
|
|
|
if (IS_ERR(rbd_dev->header.object_prefix)) { |
|
ret = PTR_ERR(rbd_dev->header.object_prefix); |
|
rbd_dev->header.object_prefix = NULL; |
|
} else { |
|
dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); |
|
} |
|
out: |
|
kfree(reply_buf); |
|
|
|
return ret; |
|
} |
|
|
|
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
|
bool read_only, u64 *snap_features) |
|
{ |
|
struct { |
|
__le64 snap_id; |
|
u8 read_only; |
|
} features_in; |
|
struct { |
|
__le64 features; |
|
__le64 incompat; |
|
} __attribute__ ((packed)) features_buf = { 0 }; |
|
u64 unsup; |
|
int ret; |
|
|
|
features_in.snap_id = cpu_to_le64(snap_id); |
|
features_in.read_only = read_only; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_features", |
|
&features_in, sizeof(features_in), |
|
&features_buf, sizeof(features_buf)); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) |
|
return ret; |
|
if (ret < sizeof (features_buf)) |
|
return -ERANGE; |
|
|
|
unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
|
if (unsup) { |
|
rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", |
|
unsup); |
|
return -ENXIO; |
|
} |
|
|
|
*snap_features = le64_to_cpu(features_buf.features); |
|
|
|
dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", |
|
(unsigned long long)snap_id, |
|
(unsigned long long)*snap_features, |
|
(unsigned long long)le64_to_cpu(features_buf.incompat)); |
|
|
|
return 0; |
|
} |
|
|
|
static int rbd_dev_v2_features(struct rbd_device *rbd_dev) |
|
{ |
|
return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, |
|
rbd_is_ro(rbd_dev), |
|
&rbd_dev->header.features); |
|
} |
|
|
|
/* |
|
* These are generic image flags, but since they are used only for |
|
* object map, store them in rbd_dev->object_map_flags. |
|
* |
|
* For the same reason, this function is called only on object map |
|
* (re)load and not on header refresh. |
|
*/ |
|
static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev) |
|
{ |
|
__le64 snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
|
__le64 flags; |
|
int ret; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_flags", |
|
&snapid, sizeof(snapid), |
|
&flags, sizeof(flags)); |
|
if (ret < 0) |
|
return ret; |
|
if (ret < sizeof(flags)) |
|
return -EBADMSG; |
|
|
|
rbd_dev->object_map_flags = le64_to_cpu(flags); |
|
return 0; |
|
} |
|
|
|
struct parent_image_info { |
|
u64 pool_id; |
|
const char *pool_ns; |
|
const char *image_id; |
|
u64 snap_id; |
|
|
|
bool has_overlap; |
|
u64 overlap; |
|
}; |
|
|
|
/* |
|
* The caller is responsible for @pii. |
|
*/ |
|
static int decode_parent_image_spec(void **p, void *end, |
|
struct parent_image_info *pii) |
|
{ |
|
u8 struct_v; |
|
u32 struct_len; |
|
int ret; |
|
|
|
ret = ceph_start_decoding(p, end, 1, "ParentImageSpec", |
|
&struct_v, &struct_len); |
|
if (ret) |
|
return ret; |
|
|
|
ceph_decode_64_safe(p, end, pii->pool_id, e_inval); |
|
pii->pool_ns = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); |
|
if (IS_ERR(pii->pool_ns)) { |
|
ret = PTR_ERR(pii->pool_ns); |
|
pii->pool_ns = NULL; |
|
return ret; |
|
} |
|
pii->image_id = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); |
|
if (IS_ERR(pii->image_id)) { |
|
ret = PTR_ERR(pii->image_id); |
|
pii->image_id = NULL; |
|
return ret; |
|
} |
|
ceph_decode_64_safe(p, end, pii->snap_id, e_inval); |
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int __get_parent_info(struct rbd_device *rbd_dev, |
|
struct page *req_page, |
|
struct page *reply_page, |
|
struct parent_image_info *pii) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
size_t reply_len = PAGE_SIZE; |
|
void *p, *end; |
|
int ret; |
|
|
|
ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
|
"rbd", "parent_get", CEPH_OSD_FLAG_READ, |
|
req_page, sizeof(u64), &reply_page, &reply_len); |
|
if (ret) |
|
return ret == -EOPNOTSUPP ? 1 : ret; |
|
|
|
p = page_address(reply_page); |
|
end = p + reply_len; |
|
ret = decode_parent_image_spec(&p, end, pii); |
|
if (ret) |
|
return ret; |
|
|
|
ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
|
"rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ, |
|
req_page, sizeof(u64), &reply_page, &reply_len); |
|
if (ret) |
|
return ret; |
|
|
|
p = page_address(reply_page); |
|
end = p + reply_len; |
|
ceph_decode_8_safe(&p, end, pii->has_overlap, e_inval); |
|
if (pii->has_overlap) |
|
ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
|
|
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* The caller is responsible for @pii. |
|
*/ |
|
static int __get_parent_info_legacy(struct rbd_device *rbd_dev, |
|
struct page *req_page, |
|
struct page *reply_page, |
|
struct parent_image_info *pii) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
size_t reply_len = PAGE_SIZE; |
|
void *p, *end; |
|
int ret; |
|
|
|
ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
|
"rbd", "get_parent", CEPH_OSD_FLAG_READ, |
|
req_page, sizeof(u64), &reply_page, &reply_len); |
|
if (ret) |
|
return ret; |
|
|
|
p = page_address(reply_page); |
|
end = p + reply_len; |
|
ceph_decode_64_safe(&p, end, pii->pool_id, e_inval); |
|
pii->image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
|
if (IS_ERR(pii->image_id)) { |
|
ret = PTR_ERR(pii->image_id); |
|
pii->image_id = NULL; |
|
return ret; |
|
} |
|
ceph_decode_64_safe(&p, end, pii->snap_id, e_inval); |
|
pii->has_overlap = true; |
|
ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
|
|
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int get_parent_info(struct rbd_device *rbd_dev, |
|
struct parent_image_info *pii) |
|
{ |
|
struct page *req_page, *reply_page; |
|
void *p; |
|
int ret; |
|
|
|
req_page = alloc_page(GFP_KERNEL); |
|
if (!req_page) |
|
return -ENOMEM; |
|
|
|
reply_page = alloc_page(GFP_KERNEL); |
|
if (!reply_page) { |
|
__free_page(req_page); |
|
return -ENOMEM; |
|
} |
|
|
|
p = page_address(req_page); |
|
ceph_encode_64(&p, rbd_dev->spec->snap_id); |
|
ret = __get_parent_info(rbd_dev, req_page, reply_page, pii); |
|
if (ret > 0) |
|
ret = __get_parent_info_legacy(rbd_dev, req_page, reply_page, |
|
pii); |
|
|
|
__free_page(req_page); |
|
__free_page(reply_page); |
|
return ret; |
|
} |
|
|
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_spec *parent_spec; |
|
struct parent_image_info pii = { 0 }; |
|
int ret; |
|
|
|
parent_spec = rbd_spec_alloc(); |
|
if (!parent_spec) |
|
return -ENOMEM; |
|
|
|
ret = get_parent_info(rbd_dev, &pii); |
|
if (ret) |
|
goto out_err; |
|
|
|
dout("%s pool_id %llu pool_ns %s image_id %s snap_id %llu has_overlap %d overlap %llu\n", |
|
__func__, pii.pool_id, pii.pool_ns, pii.image_id, pii.snap_id, |
|
pii.has_overlap, pii.overlap); |
|
|
|
if (pii.pool_id == CEPH_NOPOOL || !pii.has_overlap) { |
|
/* |
|
* Either the parent never existed, or we have |
|
* record of it but the image got flattened so it no |
|
* longer has a parent. When the parent of a |
|
* layered image disappears we immediately set the |
|
* overlap to 0. The effect of this is that all new |
|
* requests will be treated as if the image had no |
|
* parent. |
|
* |
|
* If !pii.has_overlap, the parent image spec is not |
|
* applicable. It's there to avoid duplication in each |
|
* snapshot record. |
|
*/ |
|
if (rbd_dev->parent_overlap) { |
|
rbd_dev->parent_overlap = 0; |
|
rbd_dev_parent_put(rbd_dev); |
|
pr_info("%s: clone image has been flattened\n", |
|
rbd_dev->disk->disk_name); |
|
} |
|
|
|
goto out; /* No parent? No problem. */ |
|
} |
|
|
|
/* The ceph file layout needs to fit pool id in 32 bits */ |
|
|
|
ret = -EIO; |
|
if (pii.pool_id > (u64)U32_MAX) { |
|
rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
|
(unsigned long long)pii.pool_id, U32_MAX); |
|
goto out_err; |
|
} |
|
|
|
/* |
|
* The parent won't change (except when the clone is |
|
* flattened, already handled that). So we only need to |
|
* record the parent spec we have not already done so. |
|
*/ |
|
if (!rbd_dev->parent_spec) { |
|
parent_spec->pool_id = pii.pool_id; |
|
if (pii.pool_ns && *pii.pool_ns) { |
|
parent_spec->pool_ns = pii.pool_ns; |
|
pii.pool_ns = NULL; |
|
} |
|
parent_spec->image_id = pii.image_id; |
|
pii.image_id = NULL; |
|
parent_spec->snap_id = pii.snap_id; |
|
|
|
rbd_dev->parent_spec = parent_spec; |
|
parent_spec = NULL; /* rbd_dev now owns this */ |
|
} |
|
|
|
/* |
|
* We always update the parent overlap. If it's zero we issue |
|
* a warning, as we will proceed as if there was no parent. |
|
*/ |
|
if (!pii.overlap) { |
|
if (parent_spec) { |
|
/* refresh, careful to warn just once */ |
|
if (rbd_dev->parent_overlap) |
|
rbd_warn(rbd_dev, |
|
"clone now standalone (overlap became 0)"); |
|
} else { |
|
/* initial probe */ |
|
rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); |
|
} |
|
} |
|
rbd_dev->parent_overlap = pii.overlap; |
|
|
|
out: |
|
ret = 0; |
|
out_err: |
|
kfree(pii.pool_ns); |
|
kfree(pii.image_id); |
|
rbd_spec_put(parent_spec); |
|
return ret; |
|
} |
|
|
|
static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
|
{ |
|
struct { |
|
__le64 stripe_unit; |
|
__le64 stripe_count; |
|
} __attribute__ ((packed)) striping_info_buf = { 0 }; |
|
size_t size = sizeof (striping_info_buf); |
|
void *p; |
|
int ret; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_stripe_unit_count", |
|
NULL, 0, &striping_info_buf, size); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) |
|
return ret; |
|
if (ret < size) |
|
return -ERANGE; |
|
|
|
p = &striping_info_buf; |
|
rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
|
rbd_dev->header.stripe_count = ceph_decode_64(&p); |
|
return 0; |
|
} |
|
|
|
static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
|
{ |
|
__le64 data_pool_id; |
|
int ret; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_data_pool", |
|
NULL, 0, &data_pool_id, sizeof(data_pool_id)); |
|
if (ret < 0) |
|
return ret; |
|
if (ret < sizeof(data_pool_id)) |
|
return -EBADMSG; |
|
|
|
rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); |
|
WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); |
|
return 0; |
|
} |
|
|
|
static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
|
{ |
|
CEPH_DEFINE_OID_ONSTACK(oid); |
|
size_t image_id_size; |
|
char *image_id; |
|
void *p; |
|
void *end; |
|
size_t size; |
|
void *reply_buf = NULL; |
|
size_t len = 0; |
|
char *image_name = NULL; |
|
int ret; |
|
|
|
rbd_assert(!rbd_dev->spec->image_name); |
|
|
|
len = strlen(rbd_dev->spec->image_id); |
|
image_id_size = sizeof (__le32) + len; |
|
image_id = kmalloc(image_id_size, GFP_KERNEL); |
|
if (!image_id) |
|
return NULL; |
|
|
|
p = image_id; |
|
end = image_id + image_id_size; |
|
ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
|
|
|
size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; |
|
reply_buf = kmalloc(size, GFP_KERNEL); |
|
if (!reply_buf) |
|
goto out; |
|
|
|
ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
|
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
|
"dir_get_name", image_id, image_id_size, |
|
reply_buf, size); |
|
if (ret < 0) |
|
goto out; |
|
p = reply_buf; |
|
end = reply_buf + ret; |
|
|
|
image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
|
if (IS_ERR(image_name)) |
|
image_name = NULL; |
|
else |
|
dout("%s: name is %s len is %zd\n", __func__, image_name, len); |
|
out: |
|
kfree(reply_buf); |
|
kfree(image_id); |
|
|
|
return image_name; |
|
} |
|
|
|
static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
|
{ |
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
|
const char *snap_name; |
|
u32 which = 0; |
|
|
|
/* Skip over names until we find the one we are looking for */ |
|
|
|
snap_name = rbd_dev->header.snap_names; |
|
while (which < snapc->num_snaps) { |
|
if (!strcmp(name, snap_name)) |
|
return snapc->snaps[which]; |
|
snap_name += strlen(snap_name) + 1; |
|
which++; |
|
} |
|
return CEPH_NOSNAP; |
|
} |
|
|
|
static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
|
{ |
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
|
u32 which; |
|
bool found = false; |
|
u64 snap_id; |
|
|
|
for (which = 0; !found && which < snapc->num_snaps; which++) { |
|
const char *snap_name; |
|
|
|
snap_id = snapc->snaps[which]; |
|
snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); |
|
if (IS_ERR(snap_name)) { |
|
/* ignore no-longer existing snapshots */ |
|
if (PTR_ERR(snap_name) == -ENOENT) |
|
continue; |
|
else |
|
break; |
|
} |
|
found = !strcmp(name, snap_name); |
|
kfree(snap_name); |
|
} |
|
return found ? snap_id : CEPH_NOSNAP; |
|
} |
|
|
|
/* |
|
* Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if |
|
* no snapshot by that name is found, or if an error occurs. |
|
*/ |
|
static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
|
{ |
|
if (rbd_dev->image_format == 1) |
|
return rbd_v1_snap_id_by_name(rbd_dev, name); |
|
|
|
return rbd_v2_snap_id_by_name(rbd_dev, name); |
|
} |
|
|
|
/* |
|
* An image being mapped will have everything but the snap id. |
|
*/ |
|
static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_spec *spec = rbd_dev->spec; |
|
|
|
rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); |
|
rbd_assert(spec->image_id && spec->image_name); |
|
rbd_assert(spec->snap_name); |
|
|
|
if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { |
|
u64 snap_id; |
|
|
|
snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
|
if (snap_id == CEPH_NOSNAP) |
|
return -ENOENT; |
|
|
|
spec->snap_id = snap_id; |
|
} else { |
|
spec->snap_id = CEPH_NOSNAP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* A parent image will have all ids but none of the names. |
|
* |
|
* All names in an rbd spec are dynamically allocated. It's OK if we |
|
* can't figure out the name for an image id. |
|
*/ |
|
static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
|
{ |
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
|
struct rbd_spec *spec = rbd_dev->spec; |
|
const char *pool_name; |
|
const char *image_name; |
|
const char *snap_name; |
|
int ret; |
|
|
|
rbd_assert(spec->pool_id != CEPH_NOPOOL); |
|
rbd_assert(spec->image_id); |
|
rbd_assert(spec->snap_id != CEPH_NOSNAP); |
|
|
|
/* Get the pool name; we have to make our own copy of this */ |
|
|
|
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
|
if (!pool_name) { |
|
rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); |
|
return -EIO; |
|
} |
|
pool_name = kstrdup(pool_name, GFP_KERNEL); |
|
if (!pool_name) |
|
return -ENOMEM; |
|
|
|
/* Fetch the image name; tolerate failure here */ |
|
|
|
image_name = rbd_dev_image_name(rbd_dev); |
|
if (!image_name) |
|
rbd_warn(rbd_dev, "unable to get image name"); |
|
|
|
/* Fetch the snapshot name */ |
|
|
|
snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
|
if (IS_ERR(snap_name)) { |
|
ret = PTR_ERR(snap_name); |
|
goto out_err; |
|
} |
|
|
|
spec->pool_name = pool_name; |
|
spec->image_name = image_name; |
|
spec->snap_name = snap_name; |
|
|
|
return 0; |
|
|
|
out_err: |
|
kfree(image_name); |
|
kfree(pool_name); |
|
return ret; |
|
} |
|
|
|
static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
|
{ |
|
size_t size; |
|
int ret; |
|
void *reply_buf; |
|
void *p; |
|
void *end; |
|
u64 seq; |
|
u32 snap_count; |
|
struct ceph_snap_context *snapc; |
|
u32 i; |
|
|
|
/* |
|
* We'll need room for the seq value (maximum snapshot id), |
|
* snapshot count, and array of that many snapshot ids. |
|
* For now we have a fixed upper limit on the number we're |
|
* prepared to receive. |
|
*/ |
|
size = sizeof (__le64) + sizeof (__le32) + |
|
RBD_MAX_SNAP_COUNT * sizeof (__le64); |
|
reply_buf = kzalloc(size, GFP_KERNEL); |
|
if (!reply_buf) |
|
return -ENOMEM; |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_snapcontext", |
|
NULL, 0, reply_buf, size); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) |
|
goto out; |
|
|
|
p = reply_buf; |
|
end = reply_buf + ret; |
|
ret = -ERANGE; |
|
ceph_decode_64_safe(&p, end, seq, out); |
|
ceph_decode_32_safe(&p, end, snap_count, out); |
|
|
|
/* |
|
* Make sure the reported number of snapshot ids wouldn't go |
|
* beyond the end of our buffer. But before checking that, |
|
* make sure the computed size of the snapshot context we |
|
* allocate is representable in a size_t. |
|
*/ |
|
if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) |
|
/ sizeof (u64)) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) |
|
goto out; |
|
ret = 0; |
|
|
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
|
if (!snapc) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
snapc->seq = seq; |
|
for (i = 0; i < snap_count; i++) |
|
snapc->snaps[i] = ceph_decode_64(&p); |
|
|
|
ceph_put_snap_context(rbd_dev->header.snapc); |
|
rbd_dev->header.snapc = snapc; |
|
|
|
dout(" snap context seq = %llu, snap_count = %u\n", |
|
(unsigned long long)seq, (unsigned int)snap_count); |
|
out: |
|
kfree(reply_buf); |
|
|
|
return ret; |
|
} |
|
|
|
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
|
u64 snap_id) |
|
{ |
|
size_t size; |
|
void *reply_buf; |
|
__le64 snapid; |
|
int ret; |
|
void *p; |
|
void *end; |
|
char *snap_name; |
|
|
|
size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; |
|
reply_buf = kmalloc(size, GFP_KERNEL); |
|
if (!reply_buf) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
snapid = cpu_to_le64(snap_id); |
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
|
&rbd_dev->header_oloc, "get_snapshot_name", |
|
&snapid, sizeof(snapid), reply_buf, size); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret < 0) { |
|
snap_name = ERR_PTR(ret); |
|
goto out; |
|
} |
|
|
|
p = reply_buf; |
|
end = reply_buf + ret; |
|
snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
|
if (IS_ERR(snap_name)) |
|
goto out; |
|
|
|
dout(" snap_id 0x%016llx snap_name = %s\n", |
|
(unsigned long long)snap_id, snap_name); |
|
out: |
|
kfree(reply_buf); |
|
|
|
return snap_name; |
|
} |
|
|
|
static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
|
{ |
|
bool first_time = rbd_dev->header.object_prefix == NULL; |
|
int ret; |
|
|
|
ret = rbd_dev_v2_image_size(rbd_dev); |
|
if (ret) |
|
return ret; |
|
|
|
if (first_time) { |
|
ret = rbd_dev_v2_header_onetime(rbd_dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = rbd_dev_v2_snap_context(rbd_dev); |
|
if (ret && first_time) { |
|
kfree(rbd_dev->header.object_prefix); |
|
rbd_dev->header.object_prefix = NULL; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
|
{ |
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
|
|
|
if (rbd_dev->image_format == 1) |
|
return rbd_dev_v1_header_info(rbd_dev); |
|
|
|
return rbd_dev_v2_header_info(rbd_dev); |
|
} |
|
|
|
/* |
|
* Skips over white space at *buf, and updates *buf to point to the |
|
* first found non-space character (if any). Returns the length of |
|
* the token (string of non-white space characters) found. Note |
|
* that *buf must be terminated with '\0'. |
|
*/ |
|
static inline size_t next_token(const char **buf) |
|
{ |
|
/* |
|
* These are the characters that produce nonzero for |
|
* isspace() in the "C" and "POSIX" locales. |
|
*/ |
|
const char *spaces = " \f\n\r\t\v"; |
|
|
|
*buf += strspn(*buf, spaces); /* Find start of token */ |
|
|
|
return strcspn(*buf, spaces); /* Return token length */ |
|
} |
|
|
|
/* |
|
* Finds the next token in *buf, dynamically allocates a buffer big |
|
* enough to hold a copy of it, and copies the token into the new |
|
* buffer. The copy is guaranteed to be terminated with '\0'. Note |
|
* that a duplicate buffer is created even for a zero-length token. |
|
* |
|
* Returns a pointer to the newly-allocated duplicate, or a null |
|
* pointer if memory for the duplicate was not available. If |
|
* the lenp argument is a non-null pointer, the length of the token |
|
* (not including the '\0') is returned in *lenp. |
|
* |
|
* If successful, the *buf pointer will be updated to point beyond |
|
* the end of the found token. |
|
* |
|
* Note: uses GFP_KERNEL for allocation. |
|
*/ |
|
static inline char *dup_token(const char **buf, size_t *lenp) |
|
{ |
|
char *dup; |
|
size_t len; |
|
|
|
len = next_token(buf); |
|
dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
|
if (!dup) |
|
return NULL; |
|
*(dup + len) = '\0'; |
|
*buf += len; |
|
|
|
if (lenp) |
|
*lenp = len; |
|
|
|
return dup; |
|
} |
|
|
|
static int rbd_parse_param(struct fs_parameter *param, |
|
struct rbd_parse_opts_ctx *pctx) |
|
{ |
|
struct rbd_options *opt = pctx->opts; |
|
struct fs_parse_result result; |
|
struct p_log log = {.prefix = "rbd"}; |
|
int token, ret; |
|
|
|
ret = ceph_parse_param(param, pctx->copts, NULL); |
|
if (ret != -ENOPARAM) |
|
return ret; |
|
|
|
token = __fs_parse(&log, rbd_parameters, param, &result); |
|
dout("%s fs_parse '%s' token %d\n", __func__, param->key, token); |
|
if (token < 0) { |
|
if (token == -ENOPARAM) |
|
return inval_plog(&log, "Unknown parameter '%s'", |
|
param->key); |
|
return token; |
|
} |
|
|
|
switch (token) { |
|
case Opt_queue_depth: |
|
if (result.uint_32 < 1) |
|
goto out_of_range; |
|
opt->queue_depth = result.uint_32; |
|
break; |
|
case Opt_alloc_size: |
|
if (result.uint_32 < SECTOR_SIZE) |
|
goto out_of_range; |
|
if (!is_power_of_2(result.uint_32)) |
|
return inval_plog(&log, "alloc_size must be a power of 2"); |
|
opt->alloc_size = result.uint_32; |
|
break; |
|
case Opt_lock_timeout: |
|
/* 0 is "wait forever" (i.e. infinite timeout) */ |
|
if (result.uint_32 > INT_MAX / 1000) |
|
goto out_of_range; |
|
opt->lock_timeout = msecs_to_jiffies(result.uint_32 * 1000); |
|
break; |
|
case Opt_pool_ns: |
|
kfree(pctx->spec->pool_ns); |
|
pctx->spec->pool_ns = param->string; |
|
param->string = NULL; |
|
break; |
|
case Opt_compression_hint: |
|
switch (result.uint_32) { |
|
case Opt_compression_hint_none: |
|
opt->alloc_hint_flags &= |
|
~(CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE | |
|
CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE); |
|
break; |
|
case Opt_compression_hint_compressible: |
|
opt->alloc_hint_flags |= |
|
CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE; |
|
opt->alloc_hint_flags &= |
|
~CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE; |
|
break; |
|
case Opt_compression_hint_incompressible: |
|
opt->alloc_hint_flags |= |
|
CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE; |
|
opt->alloc_hint_flags &= |
|
~CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
break; |
|
case Opt_read_only: |
|
opt->read_only = true; |
|
break; |
|
case Opt_read_write: |
|
opt->read_only = false; |
|
break; |
|
case Opt_lock_on_read: |
|
opt->lock_on_read = true; |
|
break; |
|
case Opt_exclusive: |
|
opt->exclusive = true; |
|
break; |
|
case Opt_notrim: |
|
opt->trim = false; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
return 0; |
|
|
|
out_of_range: |
|
return inval_plog(&log, "%s out of range", param->key); |
|
} |
|
|
|
/* |
|
* This duplicates most of generic_parse_monolithic(), untying it from |
|
* fs_context and skipping standard superblock and security options. |
|
*/ |
|
static int rbd_parse_options(char *options, struct rbd_parse_opts_ctx *pctx) |
|
{ |
|
char *key; |
|
int ret = 0; |
|
|
|
dout("%s '%s'\n", __func__, options); |
|
while ((key = strsep(&options, ",")) != NULL) { |
|
if (*key) { |
|
struct fs_parameter param = { |
|
.key = key, |
|
.type = fs_value_is_flag, |
|
}; |
|
char *value = strchr(key, '='); |
|
size_t v_len = 0; |
|
|
|
if (value) { |
|
if (value == key) |
|
continue; |
|
*value++ = 0; |
|
v_len = strlen(value); |
|
param.string = kmemdup_nul(value, v_len, |
|
GFP_KERNEL); |
|
if (!param.string) |
|
return -ENOMEM; |
|
param.type = fs_value_is_string; |
|
} |
|
param.size = v_len; |
|
|
|
ret = rbd_parse_param(¶m, pctx); |
|
kfree(param.string); |
|
if (ret) |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Parse the options provided for an "rbd add" (i.e., rbd image |
|
* mapping) request. These arrive via a write to /sys/bus/rbd/add, |
|
* and the data written is passed here via a NUL-terminated buffer. |
|
* Returns 0 if successful or an error code otherwise. |
|
* |
|
* The information extracted from these options is recorded in |
|
* the other parameters which return dynamically-allocated |
|
* structures: |
|
* ceph_opts |
|
* The address of a pointer that will refer to a ceph options |
|
* structure. Caller must release the returned pointer using |
|
* ceph_destroy_options() when it is no longer needed. |
|
* rbd_opts |
|
* Address of an rbd options pointer. Fully initialized by |
|
* this function; caller must release with kfree(). |
|
* spec |
|
* Address of an rbd image specification pointer. Fully |
|
* initialized by this function based on parsed options. |
|
* Caller must release with rbd_spec_put(). |
|
* |
|
* The options passed take this form: |
|
* <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] |
|
* where: |
|
* <mon_addrs> |
|
* A comma-separated list of one or more monitor addresses. |
|
* A monitor address is an ip address, optionally followed |
|
* by a port number (separated by a colon). |
|
* I.e.: ip1[:port1][,ip2[:port2]...] |
|
* <options> |
|
* A comma-separated list of ceph and/or rbd options. |
|
* <pool_name> |
|
* The name of the rados pool containing the rbd image. |
|
* <image_name> |
|
* The name of the image in that pool to map. |
|
* <snap_id> |
|
* An optional snapshot id. If provided, the mapping will |
|
* present data from the image at the time that snapshot was |
|
* created. The image head is used if no snapshot id is |
|
* provided. Snapshot mappings are always read-only. |
|
*/ |
|
static int rbd_add_parse_args(const char *buf, |
|
struct ceph_options **ceph_opts, |
|
struct rbd_options **opts, |
|
struct rbd_spec **rbd_spec) |
|
{ |
|
size_t len; |
|
char *options; |
|
const char *mon_addrs; |
|
char *snap_name; |
|
size_t mon_addrs_size; |
|
struct rbd_parse_opts_ctx pctx = { 0 }; |
|
int ret; |
|
|
|
/* The first four tokens are required */ |
|
|
|
len = next_token(&buf); |
|
if (!len) { |
|
rbd_warn(NULL, "no monitor address(es) provided"); |
|
return -EINVAL; |
|
} |
|
mon_addrs = buf; |
|
mon_addrs_size = len; |
|
buf += len; |
|
|
|
ret = -EINVAL; |
|
options = dup_token(&buf, NULL); |
|
if (!options) |
|
return -ENOMEM; |
|
if (!*options) { |
|
rbd_warn(NULL, "no options provided"); |
|
goto out_err; |
|
} |
|
|
|
pctx.spec = rbd_spec_alloc(); |
|
if (!pctx.spec) |
|
goto out_mem; |
|
|
|
pctx.spec->pool_name = dup_token(&buf, NULL); |
|
if (!pctx.spec->pool_name) |
|
goto out_mem; |
|
if (!*pctx.spec->pool_name) { |
|
rbd_warn(NULL, "no pool name provided"); |
|
goto out_err; |
|
} |
|
|
|
pctx.spec->image_name = dup_token(&buf, NULL); |
|
if (!pctx.spec->image_name) |
|
goto out_mem; |
|
if (!*pctx.spec->image_name) { |
|
rbd_warn(NULL, "no image name provided"); |
|
goto out_err; |
|
} |
|
|
|
/* |
|
* Snapshot name is optional; default is to use "-" |
|
* (indicating the head/no snapshot). |
|
*/ |
|
len = next_token(&buf); |
|
if (!len) { |
|
buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
|
len = sizeof (RBD_SNAP_HEAD_NAME) - 1; |
|
} else if (len > RBD_MAX_SNAP_NAME_LEN) { |
|
ret = -ENAMETOOLONG; |
|
goto out_err; |
|
} |
|
snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
|
if (!snap_name) |
|
goto out_mem; |
|
*(snap_name + len) = '\0'; |
|
pctx.spec->snap_name = snap_name; |
|
|
|
pctx.copts = ceph_alloc_options(); |
|
if (!pctx.copts) |
|
goto out_mem; |
|
|
|
/* Initialize all rbd options to the defaults */ |
|
|
|
pctx.opts = kzalloc(sizeof(*pctx.opts), GFP_KERNEL); |
|
if (!pctx.opts) |
|
goto out_mem; |
|
|
|
pctx.opts->read_only = RBD_READ_ONLY_DEFAULT; |
|
pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
|
pctx.opts->alloc_size = RBD_ALLOC_SIZE_DEFAULT; |
|
pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; |
|
pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
|
pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
|
pctx.opts->trim = RBD_TRIM_DEFAULT; |
|
|
|
ret = ceph_parse_mon_ips(mon_addrs, mon_addrs_size, pctx.copts, NULL); |
|
if (ret) |
|
goto out_err; |
|
|
|
ret = rbd_parse_options(options, &pctx); |
|
if (ret) |
|
goto out_err; |
|
|
|
*ceph_opts = pctx.copts; |
|
*opts = pctx.opts; |
|
*rbd_spec = pctx.spec; |
|
kfree(options); |
|
return 0; |
|
|
|
out_mem: |
|
ret = -ENOMEM; |
|
out_err: |
|
kfree(pctx.opts); |
|
ceph_destroy_options(pctx.copts); |
|
rbd_spec_put(pctx.spec); |
|
kfree(options); |
|
return ret; |
|
} |
|
|
|
static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
|
{ |
|
down_write(&rbd_dev->lock_rwsem); |
|
if (__rbd_is_lock_owner(rbd_dev)) |
|
__rbd_release_lock(rbd_dev); |
|
up_write(&rbd_dev->lock_rwsem); |
|
} |
|
|
|
/* |
|
* If the wait is interrupted, an error is returned even if the lock |
|
* was successfully acquired. rbd_dev_image_unlock() will release it |
|
* if needed. |
|
*/ |
|
static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) |
|
{ |
|
long ret; |
|
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
|
if (!rbd_dev->opts->exclusive && !rbd_dev->opts->lock_on_read) |
|
return 0; |
|
|
|
rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); |
|
return -EINVAL; |
|
} |
|
|
|
if (rbd_is_ro(rbd_dev)) |
|
return 0; |
|
|
|
rbd_assert(!rbd_is_lock_owner(rbd_dev)); |
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
|
ret = wait_for_completion_killable_timeout(&rbd_dev->acquire_wait, |
|
ceph_timeout_jiffies(rbd_dev->opts->lock_timeout)); |
|
if (ret > 0) { |
|
ret = rbd_dev->acquire_err; |
|
} else { |
|
cancel_delayed_work_sync(&rbd_dev->lock_dwork); |
|
if (!ret) |
|
ret = -ETIMEDOUT; |
|
} |
|
|
|
if (ret) { |
|
rbd_warn(rbd_dev, "failed to acquire exclusive lock: %ld", ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* The lock may have been released by now, unless automatic lock |
|
* transitions are disabled. |
|
*/ |
|
rbd_assert(!rbd_dev->opts->exclusive || rbd_is_lock_owner(rbd_dev)); |
|
return 0; |
|
} |
|
|
|
/* |
|
* An rbd format 2 image has a unique identifier, distinct from the |
|
* name given to it by the user. Internally, that identifier is |
|
* what's used to specify the names of objects related to the image. |
|
* |
|
* A special "rbd id" object is used to map an rbd image name to its |
|
* id. If that object doesn't exist, then there is no v2 rbd image |
|
* with the supplied name. |
|
* |
|
* This function will record the given rbd_dev's image_id field if |
|
* it can be determined, and in that case will return 0. If any |
|
* errors occur a negative errno will be returned and the rbd_dev's |
|
* image_id field will be unchanged (and should be NULL). |
|
*/ |
|
static int rbd_dev_image_id(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
size_t size; |
|
CEPH_DEFINE_OID_ONSTACK(oid); |
|
void *response; |
|
char *image_id; |
|
|
|
/* |
|
* When probing a parent image, the image id is already |
|
* known (and the image name likely is not). There's no |
|
* need to fetch the image id again in this case. We |
|
* do still need to set the image format though. |
|
*/ |
|
if (rbd_dev->spec->image_id) { |
|
rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* First, see if the format 2 image id file exists, and if |
|
* so, get the image's persistent id from it. |
|
*/ |
|
ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
|
rbd_dev->spec->image_name); |
|
if (ret) |
|
return ret; |
|
|
|
dout("rbd id object name is %s\n", oid.name); |
|
|
|
/* Response will be an encoded string, which includes a length */ |
|
size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
|
response = kzalloc(size, GFP_NOIO); |
|
if (!response) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
/* If it doesn't exist we'll assume it's a format 1 image */ |
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
|
"get_id", NULL, 0, |
|
response, size); |
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
|
if (ret == -ENOENT) { |
|
image_id = kstrdup("", GFP_KERNEL); |
|
ret = image_id ? 0 : -ENOMEM; |
|
if (!ret) |
|
rbd_dev->image_format = 1; |
|
} else if (ret >= 0) { |
|
void *p = response; |
|
|
|
image_id = ceph_extract_encoded_string(&p, p + ret, |
|
NULL, GFP_NOIO); |
|
ret = PTR_ERR_OR_ZERO(image_id); |
|
if (!ret) |
|
rbd_dev->image_format = 2; |
|
} |
|
|
|
if (!ret) { |
|
rbd_dev->spec->image_id = image_id; |
|
dout("image_id is %s\n", image_id); |
|
} |
|
out: |
|
kfree(response); |
|
ceph_oid_destroy(&oid); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Undo whatever state changes are made by v1 or v2 header info |
|
* call. |
|
*/ |
|
static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_image_header *header; |
|
|
|
rbd_dev_parent_put(rbd_dev); |
|
rbd_object_map_free(rbd_dev); |
|
rbd_dev_mapping_clear(rbd_dev); |
|
|
|
/* Free dynamic fields from the header, then zero it out */ |
|
|
|
header = &rbd_dev->header; |
|
ceph_put_snap_context(header->snapc); |
|
kfree(header->snap_sizes); |
|
kfree(header->snap_names); |
|
kfree(header->object_prefix); |
|
memset(header, 0, sizeof (*header)); |
|
} |
|
|
|
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
ret = rbd_dev_v2_object_prefix(rbd_dev); |
|
if (ret) |
|
goto out_err; |
|
|
|
/* |
|
* Get the and check features for the image. Currently the |
|
* features are assumed to never change. |
|
*/ |
|
ret = rbd_dev_v2_features(rbd_dev); |
|
if (ret) |
|
goto out_err; |
|
|
|
/* If the image supports fancy striping, get its parameters */ |
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { |
|
ret = rbd_dev_v2_striping_info(rbd_dev); |
|
if (ret < 0) |
|
goto out_err; |
|
} |
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
|
ret = rbd_dev_v2_data_pool(rbd_dev); |
|
if (ret) |
|
goto out_err; |
|
} |
|
|
|
rbd_init_layout(rbd_dev); |
|
return 0; |
|
|
|
out_err: |
|
rbd_dev->header.features = 0; |
|
kfree(rbd_dev->header.object_prefix); |
|
rbd_dev->header.object_prefix = NULL; |
|
return ret; |
|
} |
|
|
|
/* |
|
* @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> |
|
* rbd_dev_image_probe() recursion depth, which means it's also the |
|
* length of the already discovered part of the parent chain. |
|
*/ |
|
static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) |
|
{ |
|
struct rbd_device *parent = NULL; |
|
int ret; |
|
|
|
if (!rbd_dev->parent_spec) |
|
return 0; |
|
|
|
if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
|
pr_info("parent chain is too long (%d)\n", depth); |
|
ret = -EINVAL; |
|
goto out_err; |
|
} |
|
|
|
parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
|
if (!parent) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
/* |
|
* Images related by parent/child relationships always share |
|
* rbd_client and spec/parent_spec, so bump their refcounts. |
|
*/ |
|
__rbd_get_client(rbd_dev->rbd_client); |
|
rbd_spec_get(rbd_dev->parent_spec); |
|
|
|
__set_bit(RBD_DEV_FLAG_READONLY, &parent->flags); |
|
|
|
ret = rbd_dev_image_probe(parent, depth); |
|
if (ret < 0) |
|
goto out_err; |
|
|
|
rbd_dev->parent = parent; |
|
atomic_set(&rbd_dev->parent_ref, 1); |
|
return 0; |
|
|
|
out_err: |
|
rbd_dev_unparent(rbd_dev); |
|
rbd_dev_destroy(parent); |
|
return ret; |
|
} |
|
|
|
static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
|
{ |
|
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
|
rbd_free_disk(rbd_dev); |
|
if (!single_major) |
|
unregister_blkdev(rbd_dev->major, rbd_dev->name); |
|
} |
|
|
|
/* |
|
* rbd_dev->header_rwsem must be locked for write and will be unlocked |
|
* upon return. |
|
*/ |
|
static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
|
{ |
|
int ret; |
|
|
|
/* Record our major and minor device numbers. */ |
|
|
|
if (!single_major) { |
|
ret = register_blkdev(0, rbd_dev->name); |
|
if (ret < 0) |
|
goto err_out_unlock; |
|
|
|
rbd_dev->major = ret; |
|
rbd_dev->minor = 0; |
|
} else { |
|
rbd_dev->major = rbd_major; |
|
rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); |
|
} |
|
|
|
/* Set up the blkdev mapping. */ |
|
|
|
ret = rbd_init_disk(rbd_dev); |
|
if (ret) |
|
goto err_out_blkdev; |
|
|
|
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
|
set_disk_ro(rbd_dev->disk, rbd_is_ro(rbd_dev)); |
|
|
|
ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
|
if (ret) |
|
goto err_out_disk; |
|
|
|
set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
|
up_write(&rbd_dev->header_rwsem); |
|
return 0; |
|
|
|
err_out_disk: |
|
rbd_free_disk(rbd_dev); |
|
err_out_blkdev: |
|
if (!single_major) |
|
unregister_blkdev(rbd_dev->major, rbd_dev->name); |
|
err_out_unlock: |
|
up_write(&rbd_dev->header_rwsem); |
|
return ret; |
|
} |
|
|
|
static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
|
{ |
|
struct rbd_spec *spec = rbd_dev->spec; |
|
int ret; |
|
|
|
/* Record the header object name for this rbd image. */ |
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
|
if (rbd_dev->image_format == 1) |
|
ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
|
spec->image_name, RBD_SUFFIX); |
|
else |
|
ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
|
RBD_HEADER_PREFIX, spec->image_id); |
|
|
|
return ret; |
|
} |
|
|
|
static void rbd_print_dne(struct rbd_device *rbd_dev, bool is_snap) |
|
{ |
|
if (!is_snap) { |
|
pr_info("image %s/%s%s%s does not exist\n", |
|
rbd_dev->spec->pool_name, |
|
rbd_dev->spec->pool_ns ?: "", |
|
rbd_dev->spec->pool_ns ? "/" : "", |
|
rbd_dev->spec->image_name); |
|
} else { |
|
pr_info("snap %s/%s%s%s@%s does not exist\n", |
|
rbd_dev->spec->pool_name, |
|
rbd_dev->spec->pool_ns ?: "", |
|
rbd_dev->spec->pool_ns ? "/" : "", |
|
rbd_dev->spec->image_name, |
|
rbd_dev->spec->snap_name); |
|
} |
|
} |
|
|
|
static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
|
{ |
|
if (!rbd_is_ro(rbd_dev)) |
|
rbd_unregister_watch(rbd_dev); |
|
|
|
rbd_dev_unprobe(rbd_dev); |
|
rbd_dev->image_format = 0; |
|
kfree(rbd_dev->spec->image_id); |
|
rbd_dev->spec->image_id = NULL; |
|
} |
|
|
|
/* |
|
* Probe for the existence of the header object for the given rbd |
|
* device. If this image is the one being mapped (i.e., not a |
|
* parent), initiate a watch on its header object before using that |
|
* object to get detailed information about the rbd image. |
|
* |
|
* On success, returns with header_rwsem held for write if called |
|
* with @depth == 0. |
|
*/ |
|
static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
|
{ |
|
bool need_watch = !rbd_is_ro(rbd_dev); |
|
int ret; |
|
|
|
/* |
|
* Get the id from the image id object. Unless there's an |
|
* error, rbd_dev->spec->image_id will be filled in with |
|
* a dynamically-allocated string, and rbd_dev->image_format |
|
* will be set to either 1 or 2. |
|
*/ |
|
ret = rbd_dev_image_id(rbd_dev); |
|
if (ret) |
|
return ret; |
|
|
|
ret = rbd_dev_header_name(rbd_dev); |
|
if (ret) |
|
goto err_out_format; |
|
|
|
if (need_watch) { |
|
ret = rbd_register_watch(rbd_dev); |
|
if (ret) { |
|
if (ret == -ENOENT) |
|
rbd_print_dne(rbd_dev, false); |
|
goto err_out_format; |
|
} |
|
} |
|
|
|
if (!depth) |
|
down_write(&rbd_dev->header_rwsem); |
|
|
|
ret = rbd_dev_header_info(rbd_dev); |
|
if (ret) { |
|
if (ret == -ENOENT && !need_watch) |
|
rbd_print_dne(rbd_dev, false); |
|
goto err_out_probe; |
|
} |
|
|
|
/* |
|
* If this image is the one being mapped, we have pool name and |
|
* id, image name and id, and snap name - need to fill snap id. |
|
* Otherwise this is a parent image, identified by pool, image |
|
* and snap ids - need to fill in names for those ids. |
|
*/ |
|
if (!depth) |
|
ret = rbd_spec_fill_snap_id(rbd_dev); |
|
else |
|
ret = rbd_spec_fill_names(rbd_dev); |
|
if (ret) { |
|
if (ret == -ENOENT) |
|
rbd_print_dne(rbd_dev, true); |
|
goto err_out_probe; |
|
} |
|
|
|
ret = rbd_dev_mapping_set(rbd_dev); |
|
if (ret) |
|
goto err_out_probe; |
|
|
|
if (rbd_is_snap(rbd_dev) && |
|
(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) { |
|
ret = rbd_object_map_load(rbd_dev); |
|
if (ret) |
|
goto err_out_probe; |
|
} |
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
|
ret = rbd_dev_v2_parent_info(rbd_dev); |
|
if (ret) |
|
goto err_out_probe; |
|
} |
|
|
|
ret = rbd_dev_probe_parent(rbd_dev, depth); |
|
if (ret) |
|
goto err_out_probe; |
|
|
|
dout("discovered format %u image, header name is %s\n", |
|
rbd_dev->image_format, rbd_dev->header_oid.name); |
|
return 0; |
|
|
|
err_out_probe: |
|
if (!depth) |
|
up_write(&rbd_dev->header_rwsem); |
|
if (need_watch) |
|
rbd_unregister_watch(rbd_dev); |
|
rbd_dev_unprobe(rbd_dev); |
|
err_out_format: |
|
rbd_dev->image_format = 0; |
|
kfree(rbd_dev->spec->image_id); |
|
rbd_dev->spec->image_id = NULL; |
|
return ret; |
|
} |
|
|
|
static ssize_t do_rbd_add(struct bus_type *bus, |
|
const char *buf, |
|
size_t count) |
|
{ |
|
struct rbd_device *rbd_dev = NULL; |
|
struct ceph_options *ceph_opts = NULL; |
|
struct rbd_options *rbd_opts = NULL; |
|
struct rbd_spec *spec = NULL; |
|
struct rbd_client *rbdc; |
|
int rc; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
if (!try_module_get(THIS_MODULE)) |
|
return -ENODEV; |
|
|
|
/* parse add command */ |
|
rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
|
if (rc < 0) |
|
goto out; |
|
|
|
rbdc = rbd_get_client(ceph_opts); |
|
if (IS_ERR(rbdc)) { |
|
rc = PTR_ERR(rbdc); |
|
goto err_out_args; |
|
} |
|
|
|
/* pick the pool */ |
|
rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
|
if (rc < 0) { |
|
if (rc == -ENOENT) |
|
pr_info("pool %s does not exist\n", spec->pool_name); |
|
goto err_out_client; |
|
} |
|
spec->pool_id = (u64)rc; |
|
|
|
rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
|
if (!rbd_dev) { |
|
rc = -ENOMEM; |
|
goto err_out_client; |
|
} |
|
rbdc = NULL; /* rbd_dev now owns this */ |
|
spec = NULL; /* rbd_dev now owns this */ |
|
rbd_opts = NULL; /* rbd_dev now owns this */ |
|
|
|
/* if we are mapping a snapshot it will be a read-only mapping */ |
|
if (rbd_dev->opts->read_only || |
|
strcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME)) |
|
__set_bit(RBD_DEV_FLAG_READONLY, &rbd_dev->flags); |
|
|
|
rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
|
if (!rbd_dev->config_info) { |
|
rc = -ENOMEM; |
|
goto err_out_rbd_dev; |
|
} |
|
|
|
rc = rbd_dev_image_probe(rbd_dev, 0); |
|
if (rc < 0) |
|
goto err_out_rbd_dev; |
|
|
|
if (rbd_dev->opts->alloc_size > rbd_dev->layout.object_size) { |
|
rbd_warn(rbd_dev, "alloc_size adjusted to %u", |
|
rbd_dev->layout.object_size); |
|
rbd_dev->opts->alloc_size = rbd_dev->layout.object_size; |
|
} |
|
|
|
rc = rbd_dev_device_setup(rbd_dev); |
|
if (rc) |
|
goto err_out_image_probe; |
|
|
|
rc = rbd_add_acquire_lock(rbd_dev); |
|
if (rc) |
|
goto err_out_image_lock; |
|
|
|
/* Everything's ready. Announce the disk to the world. */ |
|
|
|
rc = device_add(&rbd_dev->dev); |
|
if (rc) |
|
goto err_out_image_lock; |
|
|
|
device_add_disk(&rbd_dev->dev, rbd_dev->disk, NULL); |
|
|
|
spin_lock(&rbd_dev_list_lock); |
|
list_add_tail(&rbd_dev->node, &rbd_dev_list); |
|
spin_unlock(&rbd_dev_list_lock); |
|
|
|
pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, |
|
(unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, |
|
rbd_dev->header.features); |
|
rc = count; |
|
out: |
|
module_put(THIS_MODULE); |
|
return rc; |
|
|
|
err_out_image_lock: |
|
rbd_dev_image_unlock(rbd_dev); |
|
rbd_dev_device_release(rbd_dev); |
|
err_out_image_probe: |
|
rbd_dev_image_release(rbd_dev); |
|
err_out_rbd_dev: |
|
rbd_dev_destroy(rbd_dev); |
|
err_out_client: |
|
rbd_put_client(rbdc); |
|
err_out_args: |
|
rbd_spec_put(spec); |
|
kfree(rbd_opts); |
|
goto out; |
|
} |
|
|
|
static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count) |
|
{ |
|
if (single_major) |
|
return -EINVAL; |
|
|
|
return do_rbd_add(bus, buf, count); |
|
} |
|
|
|
static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, |
|
size_t count) |
|
{ |
|
return do_rbd_add(bus, buf, count); |
|
} |
|
|
|
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
|
{ |
|
while (rbd_dev->parent) { |
|
struct rbd_device *first = rbd_dev; |
|
struct rbd_device *second = first->parent; |
|
struct rbd_device *third; |
|
|
|
/* |
|
* Follow to the parent with no grandparent and |
|
* remove it. |
|
*/ |
|
while (second && (third = second->parent)) { |
|
first = second; |
|
second = third; |
|
} |
|
rbd_assert(second); |
|
rbd_dev_image_release(second); |
|
rbd_dev_destroy(second); |
|
first->parent = NULL; |
|
first->parent_overlap = 0; |
|
|
|
rbd_assert(first->parent_spec); |
|
rbd_spec_put(first->parent_spec); |
|
first->parent_spec = NULL; |
|
} |
|
} |
|
|
|
static ssize_t do_rbd_remove(struct bus_type *bus, |
|
const char *buf, |
|
size_t count) |
|
{ |
|
struct rbd_device *rbd_dev = NULL; |
|
struct list_head *tmp; |
|
int dev_id; |
|
char opt_buf[6]; |
|
bool force = false; |
|
int ret; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
dev_id = -1; |
|
opt_buf[0] = '\0'; |
|
sscanf(buf, "%d %5s", &dev_id, opt_buf); |
|
if (dev_id < 0) { |
|
pr_err("dev_id out of range\n"); |
|
return -EINVAL; |
|
} |
|
if (opt_buf[0] != '\0') { |
|
if (!strcmp(opt_buf, "force")) { |
|
force = true; |
|
} else { |
|
pr_err("bad remove option at '%s'\n", opt_buf); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
ret = -ENOENT; |
|
spin_lock(&rbd_dev_list_lock); |
|
list_for_each(tmp, &rbd_dev_list) { |
|
rbd_dev = list_entry(tmp, struct rbd_device, node); |
|
if (rbd_dev->dev_id == dev_id) { |
|
ret = 0; |
|
break; |
|
} |
|
} |
|
if (!ret) { |
|
spin_lock_irq(&rbd_dev->lock); |
|
if (rbd_dev->open_count && !force) |
|
ret = -EBUSY; |
|
else if (test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
|
&rbd_dev->flags)) |
|
ret = -EINPROGRESS; |
|
spin_unlock_irq(&rbd_dev->lock); |
|
} |
|
spin_unlock(&rbd_dev_list_lock); |
|
if (ret) |
|
return ret; |
|
|
|
if (force) { |
|
/* |
|
* Prevent new IO from being queued and wait for existing |
|
* IO to complete/fail. |
|
*/ |
|
blk_mq_freeze_queue(rbd_dev->disk->queue); |
|
blk_set_queue_dying(rbd_dev->disk->queue); |
|
} |
|
|
|
del_gendisk(rbd_dev->disk); |
|
spin_lock(&rbd_dev_list_lock); |
|
list_del_init(&rbd_dev->node); |
|
spin_unlock(&rbd_dev_list_lock); |
|
device_del(&rbd_dev->dev); |
|
|
|
rbd_dev_image_unlock(rbd_dev); |
|
rbd_dev_device_release(rbd_dev); |
|
rbd_dev_image_release(rbd_dev); |
|
rbd_dev_destroy(rbd_dev); |
|
return count; |
|
} |
|
|
|
static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count) |
|
{ |
|
if (single_major) |
|
return -EINVAL; |
|
|
|
return do_rbd_remove(bus, buf, count); |
|
} |
|
|
|
static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, |
|
size_t count) |
|
{ |
|
return do_rbd_remove(bus, buf, count); |
|
} |
|
|
|
/* |
|
* create control files in sysfs |
|
* /sys/bus/rbd/... |
|
*/ |
|
static int __init rbd_sysfs_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = device_register(&rbd_root_dev); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = bus_register(&rbd_bus_type); |
|
if (ret < 0) |
|
device_unregister(&rbd_root_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static void __exit rbd_sysfs_cleanup(void) |
|
{ |
|
bus_unregister(&rbd_bus_type); |
|
device_unregister(&rbd_root_dev); |
|
} |
|
|
|
static int __init rbd_slab_init(void) |
|
{ |
|
rbd_assert(!rbd_img_request_cache); |
|
rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
|
if (!rbd_img_request_cache) |
|
return -ENOMEM; |
|
|
|
rbd_assert(!rbd_obj_request_cache); |
|
rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
|
if (!rbd_obj_request_cache) |
|
goto out_err; |
|
|
|
return 0; |
|
|
|
out_err: |
|
kmem_cache_destroy(rbd_img_request_cache); |
|
rbd_img_request_cache = NULL; |
|
return -ENOMEM; |
|
} |
|
|
|
static void rbd_slab_exit(void) |
|
{ |
|
rbd_assert(rbd_obj_request_cache); |
|
kmem_cache_destroy(rbd_obj_request_cache); |
|
rbd_obj_request_cache = NULL; |
|
|
|
rbd_assert(rbd_img_request_cache); |
|
kmem_cache_destroy(rbd_img_request_cache); |
|
rbd_img_request_cache = NULL; |
|
} |
|
|
|
static int __init rbd_init(void) |
|
{ |
|
int rc; |
|
|
|
if (!libceph_compatible(NULL)) { |
|
rbd_warn(NULL, "libceph incompatibility (quitting)"); |
|
return -EINVAL; |
|
} |
|
|
|
rc = rbd_slab_init(); |
|
if (rc) |
|
return rc; |
|
|
|
/* |
|
* The number of active work items is limited by the number of |
|
* rbd devices * queue depth, so leave @max_active at default. |
|
*/ |
|
rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); |
|
if (!rbd_wq) { |
|
rc = -ENOMEM; |
|
goto err_out_slab; |
|
} |
|
|
|
if (single_major) { |
|
rbd_major = register_blkdev(0, RBD_DRV_NAME); |
|
if (rbd_major < 0) { |
|
rc = rbd_major; |
|
goto err_out_wq; |
|
} |
|
} |
|
|
|
rc = rbd_sysfs_init(); |
|
if (rc) |
|
goto err_out_blkdev; |
|
|
|
if (single_major) |
|
pr_info("loaded (major %d)\n", rbd_major); |
|
else |
|
pr_info("loaded\n"); |
|
|
|
return 0; |
|
|
|
err_out_blkdev: |
|
if (single_major) |
|
unregister_blkdev(rbd_major, RBD_DRV_NAME); |
|
err_out_wq: |
|
destroy_workqueue(rbd_wq); |
|
err_out_slab: |
|
rbd_slab_exit(); |
|
return rc; |
|
} |
|
|
|
static void __exit rbd_exit(void) |
|
{ |
|
ida_destroy(&rbd_dev_id_ida); |
|
rbd_sysfs_cleanup(); |
|
if (single_major) |
|
unregister_blkdev(rbd_major, RBD_DRV_NAME); |
|
destroy_workqueue(rbd_wq); |
|
rbd_slab_exit(); |
|
} |
|
|
|
module_init(rbd_init); |
|
module_exit(rbd_exit); |
|
|
|
MODULE_AUTHOR("Alex Elder <[email protected]>"); |
|
MODULE_AUTHOR("Sage Weil <[email protected]>"); |
|
MODULE_AUTHOR("Yehuda Sadeh <[email protected]>"); |
|
/* following authorship retained from original osdblk.c */ |
|
MODULE_AUTHOR("Jeff Garzik <[email protected]>"); |
|
|
|
MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
|
MODULE_LICENSE("GPL");
|
|
|