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1602 lines
44 KiB
1602 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2015, SUSE |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kthread.h> |
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#include <linux/dlm.h> |
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#include <linux/sched.h> |
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#include <linux/raid/md_p.h> |
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#include "md.h" |
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#include "md-bitmap.h" |
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#include "md-cluster.h" |
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|
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#define LVB_SIZE 64 |
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#define NEW_DEV_TIMEOUT 5000 |
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|
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struct dlm_lock_resource { |
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dlm_lockspace_t *ls; |
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struct dlm_lksb lksb; |
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char *name; /* lock name. */ |
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uint32_t flags; /* flags to pass to dlm_lock() */ |
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wait_queue_head_t sync_locking; /* wait queue for synchronized locking */ |
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bool sync_locking_done; |
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void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
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struct mddev *mddev; /* pointing back to mddev. */ |
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int mode; |
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}; |
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struct resync_info { |
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__le64 lo; |
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__le64 hi; |
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}; |
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|
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/* md_cluster_info flags */ |
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#define MD_CLUSTER_WAITING_FOR_NEWDISK 1 |
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#define MD_CLUSTER_SUSPEND_READ_BALANCING 2 |
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#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3 |
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/* Lock the send communication. This is done through |
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* bit manipulation as opposed to a mutex in order to |
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* accomodate lock and hold. See next comment. |
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*/ |
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#define MD_CLUSTER_SEND_LOCK 4 |
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/* If cluster operations (such as adding a disk) must lock the |
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* communication channel, so as to perform extra operations |
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* (update metadata) and no other operation is allowed on the |
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* MD. Token needs to be locked and held until the operation |
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* completes witha md_update_sb(), which would eventually release |
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* the lock. |
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*/ |
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#define MD_CLUSTER_SEND_LOCKED_ALREADY 5 |
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/* We should receive message after node joined cluster and |
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* set up all the related infos such as bitmap and personality */ |
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#define MD_CLUSTER_ALREADY_IN_CLUSTER 6 |
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#define MD_CLUSTER_PENDING_RECV_EVENT 7 |
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#define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8 |
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struct md_cluster_info { |
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struct mddev *mddev; /* the md device which md_cluster_info belongs to */ |
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/* dlm lock space and resources for clustered raid. */ |
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dlm_lockspace_t *lockspace; |
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int slot_number; |
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struct completion completion; |
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struct mutex recv_mutex; |
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struct dlm_lock_resource *bitmap_lockres; |
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struct dlm_lock_resource **other_bitmap_lockres; |
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struct dlm_lock_resource *resync_lockres; |
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struct list_head suspend_list; |
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spinlock_t suspend_lock; |
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/* record the region which write should be suspended */ |
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sector_t suspend_lo; |
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sector_t suspend_hi; |
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int suspend_from; /* the slot which broadcast suspend_lo/hi */ |
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struct md_thread *recovery_thread; |
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unsigned long recovery_map; |
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/* communication loc resources */ |
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struct dlm_lock_resource *ack_lockres; |
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struct dlm_lock_resource *message_lockres; |
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struct dlm_lock_resource *token_lockres; |
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struct dlm_lock_resource *no_new_dev_lockres; |
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struct md_thread *recv_thread; |
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struct completion newdisk_completion; |
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wait_queue_head_t wait; |
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unsigned long state; |
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/* record the region in RESYNCING message */ |
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sector_t sync_low; |
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sector_t sync_hi; |
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}; |
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enum msg_type { |
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METADATA_UPDATED = 0, |
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RESYNCING, |
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NEWDISK, |
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REMOVE, |
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RE_ADD, |
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BITMAP_NEEDS_SYNC, |
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CHANGE_CAPACITY, |
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BITMAP_RESIZE, |
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}; |
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struct cluster_msg { |
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__le32 type; |
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__le32 slot; |
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/* TODO: Unionize this for smaller footprint */ |
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__le64 low; |
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__le64 high; |
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char uuid[16]; |
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__le32 raid_slot; |
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}; |
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static void sync_ast(void *arg) |
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{ |
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struct dlm_lock_resource *res; |
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res = arg; |
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res->sync_locking_done = true; |
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wake_up(&res->sync_locking); |
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} |
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static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) |
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{ |
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int ret = 0; |
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ret = dlm_lock(res->ls, mode, &res->lksb, |
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res->flags, res->name, strlen(res->name), |
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0, sync_ast, res, res->bast); |
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if (ret) |
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return ret; |
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wait_event(res->sync_locking, res->sync_locking_done); |
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res->sync_locking_done = false; |
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if (res->lksb.sb_status == 0) |
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res->mode = mode; |
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return res->lksb.sb_status; |
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} |
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static int dlm_unlock_sync(struct dlm_lock_resource *res) |
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{ |
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return dlm_lock_sync(res, DLM_LOCK_NL); |
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} |
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/* |
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* An variation of dlm_lock_sync, which make lock request could |
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* be interrupted |
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*/ |
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static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode, |
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struct mddev *mddev) |
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{ |
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int ret = 0; |
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ret = dlm_lock(res->ls, mode, &res->lksb, |
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res->flags, res->name, strlen(res->name), |
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0, sync_ast, res, res->bast); |
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if (ret) |
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return ret; |
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|
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wait_event(res->sync_locking, res->sync_locking_done |
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|| kthread_should_stop() |
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|| test_bit(MD_CLOSING, &mddev->flags)); |
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if (!res->sync_locking_done) { |
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/* |
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* the convert queue contains the lock request when request is |
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* interrupted, and sync_ast could still be run, so need to |
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* cancel the request and reset completion |
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*/ |
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ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL, |
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&res->lksb, res); |
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res->sync_locking_done = false; |
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if (unlikely(ret != 0)) |
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pr_info("failed to cancel previous lock request " |
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"%s return %d\n", res->name, ret); |
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return -EPERM; |
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} else |
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res->sync_locking_done = false; |
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if (res->lksb.sb_status == 0) |
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res->mode = mode; |
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return res->lksb.sb_status; |
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} |
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static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
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char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
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{ |
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struct dlm_lock_resource *res = NULL; |
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int ret, namelen; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); |
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if (!res) |
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return NULL; |
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init_waitqueue_head(&res->sync_locking); |
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res->sync_locking_done = false; |
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res->ls = cinfo->lockspace; |
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res->mddev = mddev; |
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res->mode = DLM_LOCK_IV; |
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namelen = strlen(name); |
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res->name = kzalloc(namelen + 1, GFP_KERNEL); |
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if (!res->name) { |
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pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); |
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goto out_err; |
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} |
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strlcpy(res->name, name, namelen + 1); |
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if (with_lvb) { |
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res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); |
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if (!res->lksb.sb_lvbptr) { |
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pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); |
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goto out_err; |
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} |
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res->flags = DLM_LKF_VALBLK; |
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} |
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if (bastfn) |
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res->bast = bastfn; |
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res->flags |= DLM_LKF_EXPEDITE; |
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ret = dlm_lock_sync(res, DLM_LOCK_NL); |
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if (ret) { |
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pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); |
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goto out_err; |
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} |
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res->flags &= ~DLM_LKF_EXPEDITE; |
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res->flags |= DLM_LKF_CONVERT; |
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return res; |
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out_err: |
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kfree(res->lksb.sb_lvbptr); |
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kfree(res->name); |
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kfree(res); |
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return NULL; |
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} |
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static void lockres_free(struct dlm_lock_resource *res) |
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{ |
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int ret = 0; |
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if (!res) |
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return; |
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/* |
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* use FORCEUNLOCK flag, so we can unlock even the lock is on the |
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* waiting or convert queue |
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*/ |
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ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK, |
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&res->lksb, res); |
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if (unlikely(ret != 0)) |
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pr_err("failed to unlock %s return %d\n", res->name, ret); |
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else |
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wait_event(res->sync_locking, res->sync_locking_done); |
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kfree(res->name); |
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kfree(res->lksb.sb_lvbptr); |
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kfree(res); |
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} |
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static void add_resync_info(struct dlm_lock_resource *lockres, |
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sector_t lo, sector_t hi) |
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{ |
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struct resync_info *ri; |
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ri = (struct resync_info *)lockres->lksb.sb_lvbptr; |
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ri->lo = cpu_to_le64(lo); |
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ri->hi = cpu_to_le64(hi); |
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} |
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static int read_resync_info(struct mddev *mddev, |
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struct dlm_lock_resource *lockres) |
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{ |
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struct resync_info ri; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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int ret = 0; |
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dlm_lock_sync(lockres, DLM_LOCK_CR); |
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memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); |
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if (le64_to_cpu(ri.hi) > 0) { |
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cinfo->suspend_hi = le64_to_cpu(ri.hi); |
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cinfo->suspend_lo = le64_to_cpu(ri.lo); |
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ret = 1; |
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} |
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dlm_unlock_sync(lockres); |
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return ret; |
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} |
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static void recover_bitmaps(struct md_thread *thread) |
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{ |
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struct mddev *mddev = thread->mddev; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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struct dlm_lock_resource *bm_lockres; |
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char str[64]; |
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int slot, ret; |
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sector_t lo, hi; |
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while (cinfo->recovery_map) { |
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slot = fls64((u64)cinfo->recovery_map) - 1; |
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snprintf(str, 64, "bitmap%04d", slot); |
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bm_lockres = lockres_init(mddev, str, NULL, 1); |
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if (!bm_lockres) { |
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pr_err("md-cluster: Cannot initialize bitmaps\n"); |
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goto clear_bit; |
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} |
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ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev); |
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if (ret) { |
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pr_err("md-cluster: Could not DLM lock %s: %d\n", |
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str, ret); |
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goto clear_bit; |
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} |
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ret = md_bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); |
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if (ret) { |
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pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
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goto clear_bit; |
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} |
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/* Clear suspend_area associated with the bitmap */ |
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spin_lock_irq(&cinfo->suspend_lock); |
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cinfo->suspend_hi = 0; |
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cinfo->suspend_lo = 0; |
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cinfo->suspend_from = -1; |
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spin_unlock_irq(&cinfo->suspend_lock); |
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/* Kick off a reshape if needed */ |
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if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && |
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test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
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mddev->reshape_position != MaxSector) |
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md_wakeup_thread(mddev->sync_thread); |
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if (hi > 0) { |
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if (lo < mddev->recovery_cp) |
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mddev->recovery_cp = lo; |
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/* wake up thread to continue resync in case resync |
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* is not finished */ |
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if (mddev->recovery_cp != MaxSector) { |
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/* |
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* clear the REMOTE flag since we will launch |
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* resync thread in current node. |
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*/ |
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clear_bit(MD_RESYNCING_REMOTE, |
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&mddev->recovery); |
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set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
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md_wakeup_thread(mddev->thread); |
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} |
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} |
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clear_bit: |
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lockres_free(bm_lockres); |
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clear_bit(slot, &cinfo->recovery_map); |
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} |
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} |
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static void recover_prep(void *arg) |
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{ |
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struct mddev *mddev = arg; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); |
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} |
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static void __recover_slot(struct mddev *mddev, int slot) |
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{ |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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set_bit(slot, &cinfo->recovery_map); |
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if (!cinfo->recovery_thread) { |
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cinfo->recovery_thread = md_register_thread(recover_bitmaps, |
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mddev, "recover"); |
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if (!cinfo->recovery_thread) { |
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pr_warn("md-cluster: Could not create recovery thread\n"); |
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return; |
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} |
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} |
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md_wakeup_thread(cinfo->recovery_thread); |
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} |
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static void recover_slot(void *arg, struct dlm_slot *slot) |
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{ |
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struct mddev *mddev = arg; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", |
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mddev->bitmap_info.cluster_name, |
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slot->nodeid, slot->slot, |
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cinfo->slot_number); |
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/* deduct one since dlm slot starts from one while the num of |
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* cluster-md begins with 0 */ |
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__recover_slot(mddev, slot->slot - 1); |
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} |
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static void recover_done(void *arg, struct dlm_slot *slots, |
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int num_slots, int our_slot, |
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uint32_t generation) |
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{ |
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struct mddev *mddev = arg; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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cinfo->slot_number = our_slot; |
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/* completion is only need to be complete when node join cluster, |
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* it doesn't need to run during another node's failure */ |
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if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) { |
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complete(&cinfo->completion); |
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clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); |
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} |
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clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); |
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} |
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|
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/* the ops is called when node join the cluster, and do lock recovery |
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* if node failure occurs */ |
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static const struct dlm_lockspace_ops md_ls_ops = { |
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.recover_prep = recover_prep, |
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.recover_slot = recover_slot, |
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.recover_done = recover_done, |
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}; |
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|
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/* |
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* The BAST function for the ack lock resource |
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* This function wakes up the receive thread in |
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* order to receive and process the message. |
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*/ |
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static void ack_bast(void *arg, int mode) |
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{ |
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struct dlm_lock_resource *res = arg; |
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struct md_cluster_info *cinfo = res->mddev->cluster_info; |
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|
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if (mode == DLM_LOCK_EX) { |
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if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state)) |
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md_wakeup_thread(cinfo->recv_thread); |
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else |
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set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state); |
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} |
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} |
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|
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static void remove_suspend_info(struct mddev *mddev, int slot) |
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{ |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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mddev->pers->quiesce(mddev, 1); |
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spin_lock_irq(&cinfo->suspend_lock); |
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cinfo->suspend_hi = 0; |
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cinfo->suspend_lo = 0; |
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spin_unlock_irq(&cinfo->suspend_lock); |
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mddev->pers->quiesce(mddev, 0); |
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} |
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|
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static void process_suspend_info(struct mddev *mddev, |
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int slot, sector_t lo, sector_t hi) |
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{ |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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struct mdp_superblock_1 *sb = NULL; |
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struct md_rdev *rdev; |
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|
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if (!hi) { |
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/* |
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* clear the REMOTE flag since resync or recovery is finished |
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* in remote node. |
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*/ |
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clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
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remove_suspend_info(mddev, slot); |
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set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
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md_wakeup_thread(mddev->thread); |
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return; |
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} |
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|
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rdev_for_each(rdev, mddev) |
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if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { |
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sb = page_address(rdev->sb_page); |
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break; |
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} |
|
|
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/* |
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* The bitmaps are not same for different nodes |
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* if RESYNCING is happening in one node, then |
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* the node which received the RESYNCING message |
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* probably will perform resync with the region |
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* [lo, hi] again, so we could reduce resync time |
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* a lot if we can ensure that the bitmaps among |
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* different nodes are match up well. |
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* |
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* sync_low/hi is used to record the region which |
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* arrived in the previous RESYNCING message, |
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* |
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* Call md_bitmap_sync_with_cluster to clear NEEDED_MASK |
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* and set RESYNC_MASK since resync thread is running |
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* in another node, so we don't need to do the resync |
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* again with the same section. |
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* |
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* Skip md_bitmap_sync_with_cluster in case reshape |
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* happening, because reshaping region is small and |
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* we don't want to trigger lots of WARN. |
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*/ |
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if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) |
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md_bitmap_sync_with_cluster(mddev, cinfo->sync_low, |
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cinfo->sync_hi, lo, hi); |
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cinfo->sync_low = lo; |
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cinfo->sync_hi = hi; |
|
|
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mddev->pers->quiesce(mddev, 1); |
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spin_lock_irq(&cinfo->suspend_lock); |
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cinfo->suspend_from = slot; |
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cinfo->suspend_lo = lo; |
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cinfo->suspend_hi = hi; |
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spin_unlock_irq(&cinfo->suspend_lock); |
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mddev->pers->quiesce(mddev, 0); |
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} |
|
|
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static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) |
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{ |
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char disk_uuid[64]; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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char event_name[] = "EVENT=ADD_DEVICE"; |
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char raid_slot[16]; |
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char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; |
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int len; |
|
|
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len = snprintf(disk_uuid, 64, "DEVICE_UUID="); |
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sprintf(disk_uuid + len, "%pU", cmsg->uuid); |
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snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot)); |
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pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); |
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init_completion(&cinfo->newdisk_completion); |
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set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
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kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); |
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wait_for_completion_timeout(&cinfo->newdisk_completion, |
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NEW_DEV_TIMEOUT); |
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clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
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} |
|
|
|
|
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static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) |
|
{ |
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int got_lock = 0; |
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struct md_cluster_info *cinfo = mddev->cluster_info; |
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mddev->good_device_nr = le32_to_cpu(msg->raid_slot); |
|
|
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dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
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wait_event(mddev->thread->wqueue, |
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(got_lock = mddev_trylock(mddev)) || |
|
test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state)); |
|
md_reload_sb(mddev, mddev->good_device_nr); |
|
if (got_lock) |
|
mddev_unlock(mddev); |
|
} |
|
|
|
static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) |
|
{ |
|
struct md_rdev *rdev; |
|
|
|
rcu_read_lock(); |
|
rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); |
|
if (rdev) { |
|
set_bit(ClusterRemove, &rdev->flags); |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
md_wakeup_thread(mddev->thread); |
|
} |
|
else |
|
pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", |
|
__func__, __LINE__, le32_to_cpu(msg->raid_slot)); |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
|
{ |
|
struct md_rdev *rdev; |
|
|
|
rcu_read_lock(); |
|
rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); |
|
if (rdev && test_bit(Faulty, &rdev->flags)) |
|
clear_bit(Faulty, &rdev->flags); |
|
else |
|
pr_warn("%s: %d Could not find disk(%d) which is faulty", |
|
__func__, __LINE__, le32_to_cpu(msg->raid_slot)); |
|
rcu_read_unlock(); |
|
} |
|
|
|
static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
|
{ |
|
int ret = 0; |
|
|
|
if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot), |
|
"node %d received it's own msg\n", le32_to_cpu(msg->slot))) |
|
return -1; |
|
switch (le32_to_cpu(msg->type)) { |
|
case METADATA_UPDATED: |
|
process_metadata_update(mddev, msg); |
|
break; |
|
case CHANGE_CAPACITY: |
|
set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); |
|
break; |
|
case RESYNCING: |
|
set_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
|
process_suspend_info(mddev, le32_to_cpu(msg->slot), |
|
le64_to_cpu(msg->low), |
|
le64_to_cpu(msg->high)); |
|
break; |
|
case NEWDISK: |
|
process_add_new_disk(mddev, msg); |
|
break; |
|
case REMOVE: |
|
process_remove_disk(mddev, msg); |
|
break; |
|
case RE_ADD: |
|
process_readd_disk(mddev, msg); |
|
break; |
|
case BITMAP_NEEDS_SYNC: |
|
__recover_slot(mddev, le32_to_cpu(msg->slot)); |
|
break; |
|
case BITMAP_RESIZE: |
|
if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0)) |
|
ret = md_bitmap_resize(mddev->bitmap, |
|
le64_to_cpu(msg->high), 0, 0); |
|
break; |
|
default: |
|
ret = -1; |
|
pr_warn("%s:%d Received unknown message from %d\n", |
|
__func__, __LINE__, msg->slot); |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* thread for receiving message |
|
*/ |
|
static void recv_daemon(struct md_thread *thread) |
|
{ |
|
struct md_cluster_info *cinfo = thread->mddev->cluster_info; |
|
struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; |
|
struct dlm_lock_resource *message_lockres = cinfo->message_lockres; |
|
struct cluster_msg msg; |
|
int ret; |
|
|
|
mutex_lock(&cinfo->recv_mutex); |
|
/*get CR on Message*/ |
|
if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { |
|
pr_err("md/raid1:failed to get CR on MESSAGE\n"); |
|
mutex_unlock(&cinfo->recv_mutex); |
|
return; |
|
} |
|
|
|
/* read lvb and wake up thread to process this message_lockres */ |
|
memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); |
|
ret = process_recvd_msg(thread->mddev, &msg); |
|
if (ret) |
|
goto out; |
|
|
|
/*release CR on ack_lockres*/ |
|
ret = dlm_unlock_sync(ack_lockres); |
|
if (unlikely(ret != 0)) |
|
pr_info("unlock ack failed return %d\n", ret); |
|
/*up-convert to PR on message_lockres*/ |
|
ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR); |
|
if (unlikely(ret != 0)) |
|
pr_info("lock PR on msg failed return %d\n", ret); |
|
/*get CR on ack_lockres again*/ |
|
ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR); |
|
if (unlikely(ret != 0)) |
|
pr_info("lock CR on ack failed return %d\n", ret); |
|
out: |
|
/*release CR on message_lockres*/ |
|
ret = dlm_unlock_sync(message_lockres); |
|
if (unlikely(ret != 0)) |
|
pr_info("unlock msg failed return %d\n", ret); |
|
mutex_unlock(&cinfo->recv_mutex); |
|
} |
|
|
|
/* lock_token() |
|
* Takes the lock on the TOKEN lock resource so no other |
|
* node can communicate while the operation is underway. |
|
*/ |
|
static int lock_token(struct md_cluster_info *cinfo) |
|
{ |
|
int error; |
|
|
|
error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); |
|
if (error) { |
|
pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", |
|
__func__, __LINE__, error); |
|
} else { |
|
/* Lock the receive sequence */ |
|
mutex_lock(&cinfo->recv_mutex); |
|
} |
|
return error; |
|
} |
|
|
|
/* lock_comm() |
|
* Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel. |
|
*/ |
|
static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked) |
|
{ |
|
int rv, set_bit = 0; |
|
struct mddev *mddev = cinfo->mddev; |
|
|
|
/* |
|
* If resync thread run after raid1d thread, then process_metadata_update |
|
* could not continue if raid1d held reconfig_mutex (and raid1d is blocked |
|
* since another node already got EX on Token and waitting the EX of Ack), |
|
* so let resync wake up thread in case flag is set. |
|
*/ |
|
if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
|
&cinfo->state)) { |
|
rv = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
|
&cinfo->state); |
|
WARN_ON_ONCE(rv); |
|
md_wakeup_thread(mddev->thread); |
|
set_bit = 1; |
|
} |
|
|
|
wait_event(cinfo->wait, |
|
!test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state)); |
|
rv = lock_token(cinfo); |
|
if (set_bit) |
|
clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
|
return rv; |
|
} |
|
|
|
static void unlock_comm(struct md_cluster_info *cinfo) |
|
{ |
|
WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); |
|
mutex_unlock(&cinfo->recv_mutex); |
|
dlm_unlock_sync(cinfo->token_lockres); |
|
clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state); |
|
wake_up(&cinfo->wait); |
|
} |
|
|
|
/* __sendmsg() |
|
* This function performs the actual sending of the message. This function is |
|
* usually called after performing the encompassing operation |
|
* The function: |
|
* 1. Grabs the message lockresource in EX mode |
|
* 2. Copies the message to the message LVB |
|
* 3. Downconverts message lockresource to CW |
|
* 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes |
|
* and the other nodes read the message. The thread will wait here until all other |
|
* nodes have released ack lock resource. |
|
* 5. Downconvert ack lockresource to CR |
|
*/ |
|
static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) |
|
{ |
|
int error; |
|
int slot = cinfo->slot_number - 1; |
|
|
|
cmsg->slot = cpu_to_le32(slot); |
|
/*get EX on Message*/ |
|
error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); |
|
if (error) { |
|
pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); |
|
goto failed_message; |
|
} |
|
|
|
memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, |
|
sizeof(struct cluster_msg)); |
|
/*down-convert EX to CW on Message*/ |
|
error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW); |
|
if (error) { |
|
pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n", |
|
error); |
|
goto failed_ack; |
|
} |
|
|
|
/*up-convert CR to EX on Ack*/ |
|
error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); |
|
if (error) { |
|
pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", |
|
error); |
|
goto failed_ack; |
|
} |
|
|
|
/*down-convert EX to CR on Ack*/ |
|
error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); |
|
if (error) { |
|
pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", |
|
error); |
|
goto failed_ack; |
|
} |
|
|
|
failed_ack: |
|
error = dlm_unlock_sync(cinfo->message_lockres); |
|
if (unlikely(error != 0)) { |
|
pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n", |
|
error); |
|
/* in case the message can't be released due to some reason */ |
|
goto failed_ack; |
|
} |
|
failed_message: |
|
return error; |
|
} |
|
|
|
static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg, |
|
bool mddev_locked) |
|
{ |
|
int ret; |
|
|
|
ret = lock_comm(cinfo, mddev_locked); |
|
if (!ret) { |
|
ret = __sendmsg(cinfo, cmsg); |
|
unlock_comm(cinfo); |
|
} |
|
return ret; |
|
} |
|
|
|
static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
int i, ret = 0; |
|
struct dlm_lock_resource *bm_lockres; |
|
char str[64]; |
|
sector_t lo, hi; |
|
|
|
|
|
for (i = 0; i < total_slots; i++) { |
|
memset(str, '\0', 64); |
|
snprintf(str, 64, "bitmap%04d", i); |
|
bm_lockres = lockres_init(mddev, str, NULL, 1); |
|
if (!bm_lockres) |
|
return -ENOMEM; |
|
if (i == (cinfo->slot_number - 1)) { |
|
lockres_free(bm_lockres); |
|
continue; |
|
} |
|
|
|
bm_lockres->flags |= DLM_LKF_NOQUEUE; |
|
ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
|
if (ret == -EAGAIN) { |
|
if (read_resync_info(mddev, bm_lockres)) { |
|
pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", |
|
__func__, __LINE__, |
|
(unsigned long long) cinfo->suspend_lo, |
|
(unsigned long long) cinfo->suspend_hi, |
|
i); |
|
cinfo->suspend_from = i; |
|
} |
|
ret = 0; |
|
lockres_free(bm_lockres); |
|
continue; |
|
} |
|
if (ret) { |
|
lockres_free(bm_lockres); |
|
goto out; |
|
} |
|
|
|
/* Read the disk bitmap sb and check if it needs recovery */ |
|
ret = md_bitmap_copy_from_slot(mddev, i, &lo, &hi, false); |
|
if (ret) { |
|
pr_warn("md-cluster: Could not gather bitmaps from slot %d", i); |
|
lockres_free(bm_lockres); |
|
continue; |
|
} |
|
if ((hi > 0) && (lo < mddev->recovery_cp)) { |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
mddev->recovery_cp = lo; |
|
md_check_recovery(mddev); |
|
} |
|
|
|
lockres_free(bm_lockres); |
|
} |
|
out: |
|
return ret; |
|
} |
|
|
|
static int join(struct mddev *mddev, int nodes) |
|
{ |
|
struct md_cluster_info *cinfo; |
|
int ret, ops_rv; |
|
char str[64]; |
|
|
|
cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); |
|
if (!cinfo) |
|
return -ENOMEM; |
|
|
|
INIT_LIST_HEAD(&cinfo->suspend_list); |
|
spin_lock_init(&cinfo->suspend_lock); |
|
init_completion(&cinfo->completion); |
|
set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); |
|
init_waitqueue_head(&cinfo->wait); |
|
mutex_init(&cinfo->recv_mutex); |
|
|
|
mddev->cluster_info = cinfo; |
|
cinfo->mddev = mddev; |
|
|
|
memset(str, 0, 64); |
|
sprintf(str, "%pU", mddev->uuid); |
|
ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, |
|
DLM_LSFL_FS, LVB_SIZE, |
|
&md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); |
|
if (ret) |
|
goto err; |
|
wait_for_completion(&cinfo->completion); |
|
if (nodes < cinfo->slot_number) { |
|
pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", |
|
cinfo->slot_number, nodes); |
|
ret = -ERANGE; |
|
goto err; |
|
} |
|
/* Initiate the communication resources */ |
|
ret = -ENOMEM; |
|
cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); |
|
if (!cinfo->recv_thread) { |
|
pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); |
|
goto err; |
|
} |
|
cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); |
|
if (!cinfo->message_lockres) |
|
goto err; |
|
cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); |
|
if (!cinfo->token_lockres) |
|
goto err; |
|
cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
|
if (!cinfo->no_new_dev_lockres) |
|
goto err; |
|
|
|
ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); |
|
if (ret) { |
|
ret = -EAGAIN; |
|
pr_err("md-cluster: can't join cluster to avoid lock issue\n"); |
|
goto err; |
|
} |
|
cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); |
|
if (!cinfo->ack_lockres) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
/* get sync CR lock on ACK. */ |
|
if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) |
|
pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", |
|
ret); |
|
dlm_unlock_sync(cinfo->token_lockres); |
|
/* get sync CR lock on no-new-dev. */ |
|
if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) |
|
pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); |
|
|
|
|
|
pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); |
|
snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); |
|
cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); |
|
if (!cinfo->bitmap_lockres) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { |
|
pr_err("Failed to get bitmap lock\n"); |
|
ret = -EINVAL; |
|
goto err; |
|
} |
|
|
|
cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0); |
|
if (!cinfo->resync_lockres) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
return 0; |
|
err: |
|
set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
|
md_unregister_thread(&cinfo->recovery_thread); |
|
md_unregister_thread(&cinfo->recv_thread); |
|
lockres_free(cinfo->message_lockres); |
|
lockres_free(cinfo->token_lockres); |
|
lockres_free(cinfo->ack_lockres); |
|
lockres_free(cinfo->no_new_dev_lockres); |
|
lockres_free(cinfo->resync_lockres); |
|
lockres_free(cinfo->bitmap_lockres); |
|
if (cinfo->lockspace) |
|
dlm_release_lockspace(cinfo->lockspace, 2); |
|
mddev->cluster_info = NULL; |
|
kfree(cinfo); |
|
return ret; |
|
} |
|
|
|
static void load_bitmaps(struct mddev *mddev, int total_slots) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
/* load all the node's bitmap info for resync */ |
|
if (gather_all_resync_info(mddev, total_slots)) |
|
pr_err("md-cluster: failed to gather all resyn infos\n"); |
|
set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state); |
|
/* wake up recv thread in case something need to be handled */ |
|
if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state)) |
|
md_wakeup_thread(cinfo->recv_thread); |
|
} |
|
|
|
static void resync_bitmap(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct cluster_msg cmsg = {0}; |
|
int err; |
|
|
|
cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); |
|
err = sendmsg(cinfo, &cmsg, 1); |
|
if (err) |
|
pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n", |
|
__func__, __LINE__, err); |
|
} |
|
|
|
static void unlock_all_bitmaps(struct mddev *mddev); |
|
static int leave(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
if (!cinfo) |
|
return 0; |
|
|
|
/* |
|
* BITMAP_NEEDS_SYNC message should be sent when node |
|
* is leaving the cluster with dirty bitmap, also we |
|
* can only deliver it when dlm connection is available. |
|
* |
|
* Also, we should send BITMAP_NEEDS_SYNC message in |
|
* case reshaping is interrupted. |
|
*/ |
|
if ((cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) || |
|
(mddev->reshape_position != MaxSector && |
|
test_bit(MD_CLOSING, &mddev->flags))) |
|
resync_bitmap(mddev); |
|
|
|
set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
|
md_unregister_thread(&cinfo->recovery_thread); |
|
md_unregister_thread(&cinfo->recv_thread); |
|
lockres_free(cinfo->message_lockres); |
|
lockres_free(cinfo->token_lockres); |
|
lockres_free(cinfo->ack_lockres); |
|
lockres_free(cinfo->no_new_dev_lockres); |
|
lockres_free(cinfo->resync_lockres); |
|
lockres_free(cinfo->bitmap_lockres); |
|
unlock_all_bitmaps(mddev); |
|
dlm_release_lockspace(cinfo->lockspace, 2); |
|
kfree(cinfo); |
|
return 0; |
|
} |
|
|
|
/* slot_number(): Returns the MD slot number to use |
|
* DLM starts the slot numbers from 1, wheras cluster-md |
|
* wants the number to be from zero, so we deduct one |
|
*/ |
|
static int slot_number(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
return cinfo->slot_number - 1; |
|
} |
|
|
|
/* |
|
* Check if the communication is already locked, else lock the communication |
|
* channel. |
|
* If it is already locked, token is in EX mode, and hence lock_token() |
|
* should not be called. |
|
*/ |
|
static int metadata_update_start(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
int ret; |
|
|
|
/* |
|
* metadata_update_start is always called with the protection of |
|
* reconfig_mutex, so set WAITING_FOR_TOKEN here. |
|
*/ |
|
ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, |
|
&cinfo->state); |
|
WARN_ON_ONCE(ret); |
|
md_wakeup_thread(mddev->thread); |
|
|
|
wait_event(cinfo->wait, |
|
!test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) || |
|
test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state)); |
|
|
|
/* If token is already locked, return 0 */ |
|
if (cinfo->token_lockres->mode == DLM_LOCK_EX) { |
|
clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
|
return 0; |
|
} |
|
|
|
ret = lock_token(cinfo); |
|
clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
|
return ret; |
|
} |
|
|
|
static int metadata_update_finish(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct cluster_msg cmsg; |
|
struct md_rdev *rdev; |
|
int ret = 0; |
|
int raid_slot = -1; |
|
|
|
memset(&cmsg, 0, sizeof(cmsg)); |
|
cmsg.type = cpu_to_le32(METADATA_UPDATED); |
|
/* Pick up a good active device number to send. |
|
*/ |
|
rdev_for_each(rdev, mddev) |
|
if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { |
|
raid_slot = rdev->desc_nr; |
|
break; |
|
} |
|
if (raid_slot >= 0) { |
|
cmsg.raid_slot = cpu_to_le32(raid_slot); |
|
ret = __sendmsg(cinfo, &cmsg); |
|
} else |
|
pr_warn("md-cluster: No good device id found to send\n"); |
|
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
|
unlock_comm(cinfo); |
|
return ret; |
|
} |
|
|
|
static void metadata_update_cancel(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
|
unlock_comm(cinfo); |
|
} |
|
|
|
static int update_bitmap_size(struct mddev *mddev, sector_t size) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct cluster_msg cmsg = {0}; |
|
int ret; |
|
|
|
cmsg.type = cpu_to_le32(BITMAP_RESIZE); |
|
cmsg.high = cpu_to_le64(size); |
|
ret = sendmsg(cinfo, &cmsg, 0); |
|
if (ret) |
|
pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n", |
|
__func__, __LINE__, ret); |
|
return ret; |
|
} |
|
|
|
static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize) |
|
{ |
|
struct bitmap_counts *counts; |
|
char str[64]; |
|
struct dlm_lock_resource *bm_lockres; |
|
struct bitmap *bitmap = mddev->bitmap; |
|
unsigned long my_pages = bitmap->counts.pages; |
|
int i, rv; |
|
|
|
/* |
|
* We need to ensure all the nodes can grow to a larger |
|
* bitmap size before make the reshaping. |
|
*/ |
|
rv = update_bitmap_size(mddev, newsize); |
|
if (rv) |
|
return rv; |
|
|
|
for (i = 0; i < mddev->bitmap_info.nodes; i++) { |
|
if (i == md_cluster_ops->slot_number(mddev)) |
|
continue; |
|
|
|
bitmap = get_bitmap_from_slot(mddev, i); |
|
if (IS_ERR(bitmap)) { |
|
pr_err("can't get bitmap from slot %d\n", i); |
|
bitmap = NULL; |
|
goto out; |
|
} |
|
counts = &bitmap->counts; |
|
|
|
/* |
|
* If we can hold the bitmap lock of one node then |
|
* the slot is not occupied, update the pages. |
|
*/ |
|
snprintf(str, 64, "bitmap%04d", i); |
|
bm_lockres = lockres_init(mddev, str, NULL, 1); |
|
if (!bm_lockres) { |
|
pr_err("Cannot initialize %s lock\n", str); |
|
goto out; |
|
} |
|
bm_lockres->flags |= DLM_LKF_NOQUEUE; |
|
rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
|
if (!rv) |
|
counts->pages = my_pages; |
|
lockres_free(bm_lockres); |
|
|
|
if (my_pages != counts->pages) |
|
/* |
|
* Let's revert the bitmap size if one node |
|
* can't resize bitmap |
|
*/ |
|
goto out; |
|
md_bitmap_free(bitmap); |
|
} |
|
|
|
return 0; |
|
out: |
|
md_bitmap_free(bitmap); |
|
update_bitmap_size(mddev, oldsize); |
|
return -1; |
|
} |
|
|
|
/* |
|
* return 0 if all the bitmaps have the same sync_size |
|
*/ |
|
static int cluster_check_sync_size(struct mddev *mddev) |
|
{ |
|
int i, rv; |
|
bitmap_super_t *sb; |
|
unsigned long my_sync_size, sync_size = 0; |
|
int node_num = mddev->bitmap_info.nodes; |
|
int current_slot = md_cluster_ops->slot_number(mddev); |
|
struct bitmap *bitmap = mddev->bitmap; |
|
char str[64]; |
|
struct dlm_lock_resource *bm_lockres; |
|
|
|
sb = kmap_atomic(bitmap->storage.sb_page); |
|
my_sync_size = sb->sync_size; |
|
kunmap_atomic(sb); |
|
|
|
for (i = 0; i < node_num; i++) { |
|
if (i == current_slot) |
|
continue; |
|
|
|
bitmap = get_bitmap_from_slot(mddev, i); |
|
if (IS_ERR(bitmap)) { |
|
pr_err("can't get bitmap from slot %d\n", i); |
|
return -1; |
|
} |
|
|
|
/* |
|
* If we can hold the bitmap lock of one node then |
|
* the slot is not occupied, update the sb. |
|
*/ |
|
snprintf(str, 64, "bitmap%04d", i); |
|
bm_lockres = lockres_init(mddev, str, NULL, 1); |
|
if (!bm_lockres) { |
|
pr_err("md-cluster: Cannot initialize %s\n", str); |
|
md_bitmap_free(bitmap); |
|
return -1; |
|
} |
|
bm_lockres->flags |= DLM_LKF_NOQUEUE; |
|
rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); |
|
if (!rv) |
|
md_bitmap_update_sb(bitmap); |
|
lockres_free(bm_lockres); |
|
|
|
sb = kmap_atomic(bitmap->storage.sb_page); |
|
if (sync_size == 0) |
|
sync_size = sb->sync_size; |
|
else if (sync_size != sb->sync_size) { |
|
kunmap_atomic(sb); |
|
md_bitmap_free(bitmap); |
|
return -1; |
|
} |
|
kunmap_atomic(sb); |
|
md_bitmap_free(bitmap); |
|
} |
|
|
|
return (my_sync_size == sync_size) ? 0 : -1; |
|
} |
|
|
|
/* |
|
* Update the size for cluster raid is a little more complex, we perform it |
|
* by the steps: |
|
* 1. hold token lock and update superblock in initiator node. |
|
* 2. send METADATA_UPDATED msg to other nodes. |
|
* 3. The initiator node continues to check each bitmap's sync_size, if all |
|
* bitmaps have the same value of sync_size, then we can set capacity and |
|
* let other nodes to perform it. If one node can't update sync_size |
|
* accordingly, we need to revert to previous value. |
|
*/ |
|
static void update_size(struct mddev *mddev, sector_t old_dev_sectors) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct cluster_msg cmsg; |
|
struct md_rdev *rdev; |
|
int ret = 0; |
|
int raid_slot = -1; |
|
|
|
md_update_sb(mddev, 1); |
|
if (lock_comm(cinfo, 1)) { |
|
pr_err("%s: lock_comm failed\n", __func__); |
|
return; |
|
} |
|
|
|
memset(&cmsg, 0, sizeof(cmsg)); |
|
cmsg.type = cpu_to_le32(METADATA_UPDATED); |
|
rdev_for_each(rdev, mddev) |
|
if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) { |
|
raid_slot = rdev->desc_nr; |
|
break; |
|
} |
|
if (raid_slot >= 0) { |
|
cmsg.raid_slot = cpu_to_le32(raid_slot); |
|
/* |
|
* We can only change capiticy after all the nodes can do it, |
|
* so need to wait after other nodes already received the msg |
|
* and handled the change |
|
*/ |
|
ret = __sendmsg(cinfo, &cmsg); |
|
if (ret) { |
|
pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", |
|
__func__, __LINE__); |
|
unlock_comm(cinfo); |
|
return; |
|
} |
|
} else { |
|
pr_err("md-cluster: No good device id found to send\n"); |
|
unlock_comm(cinfo); |
|
return; |
|
} |
|
|
|
/* |
|
* check the sync_size from other node's bitmap, if sync_size |
|
* have already updated in other nodes as expected, send an |
|
* empty metadata msg to permit the change of capacity |
|
*/ |
|
if (cluster_check_sync_size(mddev) == 0) { |
|
memset(&cmsg, 0, sizeof(cmsg)); |
|
cmsg.type = cpu_to_le32(CHANGE_CAPACITY); |
|
ret = __sendmsg(cinfo, &cmsg); |
|
if (ret) |
|
pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n", |
|
__func__, __LINE__); |
|
set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); |
|
} else { |
|
/* revert to previous sectors */ |
|
ret = mddev->pers->resize(mddev, old_dev_sectors); |
|
ret = __sendmsg(cinfo, &cmsg); |
|
if (ret) |
|
pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", |
|
__func__, __LINE__); |
|
} |
|
unlock_comm(cinfo); |
|
} |
|
|
|
static int resync_start(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev); |
|
} |
|
|
|
static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
spin_lock_irq(&cinfo->suspend_lock); |
|
*lo = cinfo->suspend_lo; |
|
*hi = cinfo->suspend_hi; |
|
spin_unlock_irq(&cinfo->suspend_lock); |
|
} |
|
|
|
static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct resync_info ri; |
|
struct cluster_msg cmsg = {0}; |
|
|
|
/* do not send zero again, if we have sent before */ |
|
if (hi == 0) { |
|
memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); |
|
if (le64_to_cpu(ri.hi) == 0) |
|
return 0; |
|
} |
|
|
|
add_resync_info(cinfo->bitmap_lockres, lo, hi); |
|
/* Re-acquire the lock to refresh LVB */ |
|
dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); |
|
cmsg.type = cpu_to_le32(RESYNCING); |
|
cmsg.low = cpu_to_le64(lo); |
|
cmsg.high = cpu_to_le64(hi); |
|
|
|
/* |
|
* mddev_lock is held if resync_info_update is called from |
|
* resync_finish (md_reap_sync_thread -> resync_finish) |
|
*/ |
|
if (lo == 0 && hi == 0) |
|
return sendmsg(cinfo, &cmsg, 1); |
|
else |
|
return sendmsg(cinfo, &cmsg, 0); |
|
} |
|
|
|
static int resync_finish(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
int ret = 0; |
|
|
|
clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); |
|
|
|
/* |
|
* If resync thread is interrupted so we can't say resync is finished, |
|
* another node will launch resync thread to continue. |
|
*/ |
|
if (!test_bit(MD_CLOSING, &mddev->flags)) |
|
ret = resync_info_update(mddev, 0, 0); |
|
dlm_unlock_sync(cinfo->resync_lockres); |
|
return ret; |
|
} |
|
|
|
static int area_resyncing(struct mddev *mddev, int direction, |
|
sector_t lo, sector_t hi) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
int ret = 0; |
|
|
|
if ((direction == READ) && |
|
test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) |
|
return 1; |
|
|
|
spin_lock_irq(&cinfo->suspend_lock); |
|
if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi) |
|
ret = 1; |
|
spin_unlock_irq(&cinfo->suspend_lock); |
|
return ret; |
|
} |
|
|
|
/* add_new_disk() - initiates a disk add |
|
* However, if this fails before writing md_update_sb(), |
|
* add_new_disk_cancel() must be called to release token lock |
|
*/ |
|
static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
struct cluster_msg cmsg; |
|
int ret = 0; |
|
struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
|
char *uuid = sb->device_uuid; |
|
|
|
memset(&cmsg, 0, sizeof(cmsg)); |
|
cmsg.type = cpu_to_le32(NEWDISK); |
|
memcpy(cmsg.uuid, uuid, 16); |
|
cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
|
if (lock_comm(cinfo, 1)) |
|
return -EAGAIN; |
|
ret = __sendmsg(cinfo, &cmsg); |
|
if (ret) { |
|
unlock_comm(cinfo); |
|
return ret; |
|
} |
|
cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; |
|
ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); |
|
cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; |
|
/* Some node does not "see" the device */ |
|
if (ret == -EAGAIN) |
|
ret = -ENOENT; |
|
if (ret) |
|
unlock_comm(cinfo); |
|
else { |
|
dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
|
/* Since MD_CHANGE_DEVS will be set in add_bound_rdev which |
|
* will run soon after add_new_disk, the below path will be |
|
* invoked: |
|
* md_wakeup_thread(mddev->thread) |
|
* -> conf->thread (raid1d) |
|
* -> md_check_recovery -> md_update_sb |
|
* -> metadata_update_start/finish |
|
* MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually. |
|
* |
|
* For other failure cases, metadata_update_cancel and |
|
* add_new_disk_cancel also clear below bit as well. |
|
* */ |
|
set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
|
wake_up(&cinfo->wait); |
|
} |
|
return ret; |
|
} |
|
|
|
static void add_new_disk_cancel(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
|
unlock_comm(cinfo); |
|
} |
|
|
|
static int new_disk_ack(struct mddev *mddev, bool ack) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { |
|
pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); |
|
return -EINVAL; |
|
} |
|
|
|
if (ack) |
|
dlm_unlock_sync(cinfo->no_new_dev_lockres); |
|
complete(&cinfo->newdisk_completion); |
|
return 0; |
|
} |
|
|
|
static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct cluster_msg cmsg = {0}; |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
cmsg.type = cpu_to_le32(REMOVE); |
|
cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
|
return sendmsg(cinfo, &cmsg, 1); |
|
} |
|
|
|
static int lock_all_bitmaps(struct mddev *mddev) |
|
{ |
|
int slot, my_slot, ret, held = 1, i = 0; |
|
char str[64]; |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
cinfo->other_bitmap_lockres = |
|
kcalloc(mddev->bitmap_info.nodes - 1, |
|
sizeof(struct dlm_lock_resource *), GFP_KERNEL); |
|
if (!cinfo->other_bitmap_lockres) { |
|
pr_err("md: can't alloc mem for other bitmap locks\n"); |
|
return 0; |
|
} |
|
|
|
my_slot = slot_number(mddev); |
|
for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) { |
|
if (slot == my_slot) |
|
continue; |
|
|
|
memset(str, '\0', 64); |
|
snprintf(str, 64, "bitmap%04d", slot); |
|
cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1); |
|
if (!cinfo->other_bitmap_lockres[i]) |
|
return -ENOMEM; |
|
|
|
cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE; |
|
ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW); |
|
if (ret) |
|
held = -1; |
|
i++; |
|
} |
|
|
|
return held; |
|
} |
|
|
|
static void unlock_all_bitmaps(struct mddev *mddev) |
|
{ |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
int i; |
|
|
|
/* release other node's bitmap lock if they are existed */ |
|
if (cinfo->other_bitmap_lockres) { |
|
for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) { |
|
if (cinfo->other_bitmap_lockres[i]) { |
|
lockres_free(cinfo->other_bitmap_lockres[i]); |
|
} |
|
} |
|
kfree(cinfo->other_bitmap_lockres); |
|
cinfo->other_bitmap_lockres = NULL; |
|
} |
|
} |
|
|
|
static int gather_bitmaps(struct md_rdev *rdev) |
|
{ |
|
int sn, err; |
|
sector_t lo, hi; |
|
struct cluster_msg cmsg = {0}; |
|
struct mddev *mddev = rdev->mddev; |
|
struct md_cluster_info *cinfo = mddev->cluster_info; |
|
|
|
cmsg.type = cpu_to_le32(RE_ADD); |
|
cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
|
err = sendmsg(cinfo, &cmsg, 1); |
|
if (err) |
|
goto out; |
|
|
|
for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { |
|
if (sn == (cinfo->slot_number - 1)) |
|
continue; |
|
err = md_bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); |
|
if (err) { |
|
pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); |
|
goto out; |
|
} |
|
if ((hi > 0) && (lo < mddev->recovery_cp)) |
|
mddev->recovery_cp = lo; |
|
} |
|
out: |
|
return err; |
|
} |
|
|
|
static struct md_cluster_operations cluster_ops = { |
|
.join = join, |
|
.leave = leave, |
|
.slot_number = slot_number, |
|
.resync_start = resync_start, |
|
.resync_finish = resync_finish, |
|
.resync_info_update = resync_info_update, |
|
.resync_info_get = resync_info_get, |
|
.metadata_update_start = metadata_update_start, |
|
.metadata_update_finish = metadata_update_finish, |
|
.metadata_update_cancel = metadata_update_cancel, |
|
.area_resyncing = area_resyncing, |
|
.add_new_disk = add_new_disk, |
|
.add_new_disk_cancel = add_new_disk_cancel, |
|
.new_disk_ack = new_disk_ack, |
|
.remove_disk = remove_disk, |
|
.load_bitmaps = load_bitmaps, |
|
.gather_bitmaps = gather_bitmaps, |
|
.resize_bitmaps = resize_bitmaps, |
|
.lock_all_bitmaps = lock_all_bitmaps, |
|
.unlock_all_bitmaps = unlock_all_bitmaps, |
|
.update_size = update_size, |
|
}; |
|
|
|
static int __init cluster_init(void) |
|
{ |
|
pr_warn("md-cluster: support raid1 and raid10 (limited support)\n"); |
|
pr_info("Registering Cluster MD functions\n"); |
|
register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
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return 0; |
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} |
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|
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static void cluster_exit(void) |
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{ |
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unregister_md_cluster_operations(); |
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} |
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|
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module_init(cluster_init); |
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module_exit(cluster_exit); |
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MODULE_AUTHOR("SUSE"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Clustering support for MD");
|
|
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