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4455 lines
125 KiB
4455 lines
125 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* dlmglue.c |
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* |
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* Code which implements an OCFS2 specific interface to our DLM. |
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* |
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* Copyright (C) 2003, 2004 Oracle. All rights reserved. |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/highmem.h> |
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#include <linux/mm.h> |
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#include <linux/kthread.h> |
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#include <linux/pagemap.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/time.h> |
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#include <linux/quotaops.h> |
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#include <linux/sched/signal.h> |
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#define MLOG_MASK_PREFIX ML_DLM_GLUE |
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#include <cluster/masklog.h> |
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#include "ocfs2.h" |
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#include "ocfs2_lockingver.h" |
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#include "alloc.h" |
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#include "dcache.h" |
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#include "dlmglue.h" |
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#include "extent_map.h" |
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#include "file.h" |
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#include "heartbeat.h" |
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#include "inode.h" |
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#include "journal.h" |
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#include "stackglue.h" |
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#include "slot_map.h" |
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#include "super.h" |
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#include "uptodate.h" |
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#include "quota.h" |
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#include "refcounttree.h" |
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#include "acl.h" |
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#include "buffer_head_io.h" |
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struct ocfs2_mask_waiter { |
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struct list_head mw_item; |
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int mw_status; |
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struct completion mw_complete; |
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unsigned long mw_mask; |
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unsigned long mw_goal; |
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#ifdef CONFIG_OCFS2_FS_STATS |
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ktime_t mw_lock_start; |
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#endif |
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}; |
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static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
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static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); |
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static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
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static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
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/* |
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* Return value from ->downconvert_worker functions. |
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* |
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* These control the precise actions of ocfs2_unblock_lock() |
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* and ocfs2_process_blocked_lock() |
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* |
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*/ |
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enum ocfs2_unblock_action { |
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UNBLOCK_CONTINUE = 0, /* Continue downconvert */ |
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UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire |
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* ->post_unlock callback */ |
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UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire |
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* ->post_unlock() callback. */ |
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}; |
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struct ocfs2_unblock_ctl { |
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int requeue; |
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enum ocfs2_unblock_action unblock_action; |
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}; |
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/* Lockdep class keys */ |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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static struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES]; |
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#endif |
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static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
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int new_level); |
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static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); |
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static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
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int blocking); |
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static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
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int blocking); |
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static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres); |
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static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
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static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
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int new_level); |
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static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, |
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int blocking); |
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#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) |
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/* This aids in debugging situations where a bad LVB might be involved. */ |
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static void ocfs2_dump_meta_lvb_info(u64 level, |
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const char *function, |
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unsigned int line, |
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struct ocfs2_lock_res *lockres) |
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{ |
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struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
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mlog(level, "LVB information for %s (called from %s:%u):\n", |
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lockres->l_name, function, line); |
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mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", |
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lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), |
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be32_to_cpu(lvb->lvb_igeneration)); |
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mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", |
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(unsigned long long)be64_to_cpu(lvb->lvb_isize), |
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be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), |
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be16_to_cpu(lvb->lvb_imode)); |
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mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " |
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"mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), |
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(long long)be64_to_cpu(lvb->lvb_iatime_packed), |
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(long long)be64_to_cpu(lvb->lvb_ictime_packed), |
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(long long)be64_to_cpu(lvb->lvb_imtime_packed), |
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be32_to_cpu(lvb->lvb_iattr)); |
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} |
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/* |
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* OCFS2 Lock Resource Operations |
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* |
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* These fine tune the behavior of the generic dlmglue locking infrastructure. |
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* |
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* The most basic of lock types can point ->l_priv to their respective |
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* struct ocfs2_super and allow the default actions to manage things. |
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* |
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* Right now, each lock type also needs to implement an init function, |
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* and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() |
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* should be called when the lock is no longer needed (i.e., object |
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* destruction time). |
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*/ |
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struct ocfs2_lock_res_ops { |
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/* |
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* Translate an ocfs2_lock_res * into an ocfs2_super *. Define |
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* this callback if ->l_priv is not an ocfs2_super pointer |
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*/ |
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struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); |
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/* |
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* Optionally called in the downconvert thread after a |
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* successful downconvert. The lockres will not be referenced |
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* after this callback is called, so it is safe to free |
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* memory, etc. |
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* |
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* The exact semantics of when this is called are controlled |
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* by ->downconvert_worker() |
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*/ |
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void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
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/* |
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* Allow a lock type to add checks to determine whether it is |
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* safe to downconvert a lock. Return 0 to re-queue the |
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* downconvert at a later time, nonzero to continue. |
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* |
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* For most locks, the default checks that there are no |
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* incompatible holders are sufficient. |
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* |
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* Called with the lockres spinlock held. |
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*/ |
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int (*check_downconvert)(struct ocfs2_lock_res *, int); |
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/* |
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* Allows a lock type to populate the lock value block. This |
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* is called on downconvert, and when we drop a lock. |
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* |
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* Locks that want to use this should set LOCK_TYPE_USES_LVB |
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* in the flags field. |
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* |
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* Called with the lockres spinlock held. |
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*/ |
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void (*set_lvb)(struct ocfs2_lock_res *); |
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/* |
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* Called from the downconvert thread when it is determined |
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* that a lock will be downconverted. This is called without |
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* any locks held so the function can do work that might |
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* schedule (syncing out data, etc). |
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* |
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* This should return any one of the ocfs2_unblock_action |
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* values, depending on what it wants the thread to do. |
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*/ |
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int (*downconvert_worker)(struct ocfs2_lock_res *, int); |
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/* |
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* LOCK_TYPE_* flags which describe the specific requirements |
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* of a lock type. Descriptions of each individual flag follow. |
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*/ |
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int flags; |
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}; |
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/* |
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* Some locks want to "refresh" potentially stale data when a |
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* meaningful (PRMODE or EXMODE) lock level is first obtained. If this |
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* flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the |
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* individual lockres l_flags member from the ast function. It is |
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* expected that the locking wrapper will clear the |
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* OCFS2_LOCK_NEEDS_REFRESH flag when done. |
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*/ |
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#define LOCK_TYPE_REQUIRES_REFRESH 0x1 |
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/* |
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* Indicate that a lock type makes use of the lock value block. The |
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* ->set_lvb lock type callback must be defined. |
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*/ |
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#define LOCK_TYPE_USES_LVB 0x2 |
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static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
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.get_osb = ocfs2_get_inode_osb, |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
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.get_osb = ocfs2_get_inode_osb, |
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.check_downconvert = ocfs2_check_meta_downconvert, |
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.set_lvb = ocfs2_set_meta_lvb, |
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.downconvert_worker = ocfs2_data_convert_worker, |
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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
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.flags = LOCK_TYPE_REQUIRES_REFRESH, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_rename_lops = { |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = { |
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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
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.get_osb = ocfs2_get_dentry_osb, |
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.post_unlock = ocfs2_dentry_post_unlock, |
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.downconvert_worker = ocfs2_dentry_convert_worker, |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
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.get_osb = ocfs2_get_inode_osb, |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
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.get_osb = ocfs2_get_file_osb, |
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.flags = 0, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
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.set_lvb = ocfs2_set_qinfo_lvb, |
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.get_osb = ocfs2_get_qinfo_osb, |
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.flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, |
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}; |
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static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = { |
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.check_downconvert = ocfs2_check_refcount_downconvert, |
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.downconvert_worker = ocfs2_refcount_convert_worker, |
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.flags = 0, |
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}; |
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static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
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{ |
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return lockres->l_type == OCFS2_LOCK_TYPE_META || |
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lockres->l_type == OCFS2_LOCK_TYPE_RW || |
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lockres->l_type == OCFS2_LOCK_TYPE_OPEN; |
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} |
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static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb) |
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{ |
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return container_of(lksb, struct ocfs2_lock_res, l_lksb); |
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} |
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static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
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{ |
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BUG_ON(!ocfs2_is_inode_lock(lockres)); |
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return (struct inode *) lockres->l_priv; |
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} |
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static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
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{ |
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BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); |
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return (struct ocfs2_dentry_lock *)lockres->l_priv; |
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} |
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static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
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{ |
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BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); |
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return (struct ocfs2_mem_dqinfo *)lockres->l_priv; |
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} |
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static inline struct ocfs2_refcount_tree * |
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ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res) |
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{ |
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return container_of(res, struct ocfs2_refcount_tree, rf_lockres); |
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} |
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static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
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{ |
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if (lockres->l_ops->get_osb) |
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return lockres->l_ops->get_osb(lockres); |
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return (struct ocfs2_super *)lockres->l_priv; |
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} |
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static int ocfs2_lock_create(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres, |
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int level, |
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u32 dlm_flags); |
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static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
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int wanted); |
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static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres, |
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int level, unsigned long caller_ip); |
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static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres, |
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int level) |
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{ |
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__ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_); |
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} |
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static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
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static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); |
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static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); |
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static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); |
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static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres); |
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static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
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int convert); |
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#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
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if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ |
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mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ |
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_err, _func, _lockres->l_name); \ |
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else \ |
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mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ |
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_err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ |
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(unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ |
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} while (0) |
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static int ocfs2_downconvert_thread(void *arg); |
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static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres); |
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static int ocfs2_inode_lock_update(struct inode *inode, |
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struct buffer_head **bh); |
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static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); |
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static inline int ocfs2_highest_compat_lock_level(int level); |
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static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
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int new_level); |
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static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres, |
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int new_level, |
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int lvb, |
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unsigned int generation); |
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static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres); |
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static int ocfs2_cancel_convert(struct ocfs2_super *osb, |
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struct ocfs2_lock_res *lockres); |
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static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
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u64 blkno, |
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u32 generation, |
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char *name) |
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{ |
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int len; |
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BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
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len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
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ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, |
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(long long)blkno, generation); |
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BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); |
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mlog(0, "built lock resource with name: %s\n", name); |
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} |
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|
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static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
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static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, |
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struct ocfs2_dlm_debug *dlm_debug) |
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{ |
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mlog(0, "Add tracking for lockres %s\n", res->l_name); |
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|
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spin_lock(&ocfs2_dlm_tracking_lock); |
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list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); |
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spin_unlock(&ocfs2_dlm_tracking_lock); |
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} |
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|
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static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) |
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{ |
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spin_lock(&ocfs2_dlm_tracking_lock); |
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if (!list_empty(&res->l_debug_list)) |
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list_del_init(&res->l_debug_list); |
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spin_unlock(&ocfs2_dlm_tracking_lock); |
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} |
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|
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#ifdef CONFIG_OCFS2_FS_STATS |
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static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) |
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{ |
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res->l_lock_refresh = 0; |
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res->l_lock_wait = 0; |
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memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats)); |
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memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats)); |
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} |
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|
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static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, |
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struct ocfs2_mask_waiter *mw, int ret) |
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{ |
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u32 usec; |
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ktime_t kt; |
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struct ocfs2_lock_stats *stats; |
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|
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if (level == LKM_PRMODE) |
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stats = &res->l_lock_prmode; |
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else if (level == LKM_EXMODE) |
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stats = &res->l_lock_exmode; |
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else |
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return; |
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|
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kt = ktime_sub(ktime_get(), mw->mw_lock_start); |
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usec = ktime_to_us(kt); |
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|
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stats->ls_gets++; |
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stats->ls_total += ktime_to_ns(kt); |
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/* overflow */ |
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if (unlikely(stats->ls_gets == 0)) { |
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stats->ls_gets++; |
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stats->ls_total = ktime_to_ns(kt); |
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} |
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|
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if (stats->ls_max < usec) |
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stats->ls_max = usec; |
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|
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if (ret) |
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stats->ls_fail++; |
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|
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stats->ls_last = ktime_to_us(ktime_get_real()); |
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} |
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|
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static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) |
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{ |
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lockres->l_lock_refresh++; |
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} |
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|
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static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
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{ |
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struct ocfs2_mask_waiter *mw; |
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|
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if (list_empty(&lockres->l_mask_waiters)) { |
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lockres->l_lock_wait = 0; |
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return; |
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} |
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|
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mw = list_first_entry(&lockres->l_mask_waiters, |
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struct ocfs2_mask_waiter, mw_item); |
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lockres->l_lock_wait = |
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ktime_to_us(ktime_mono_to_real(mw->mw_lock_start)); |
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} |
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|
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static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
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{ |
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mw->mw_lock_start = ktime_get(); |
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} |
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#else |
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static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) |
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{ |
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} |
|
static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, |
|
int level, struct ocfs2_mask_waiter *mw, int ret) |
|
{ |
|
} |
|
static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) |
|
{ |
|
} |
|
static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
|
{ |
|
} |
|
static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
|
{ |
|
} |
|
#endif |
|
|
|
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *res, |
|
enum ocfs2_lock_type type, |
|
struct ocfs2_lock_res_ops *ops, |
|
void *priv) |
|
{ |
|
res->l_type = type; |
|
res->l_ops = ops; |
|
res->l_priv = priv; |
|
|
|
res->l_level = DLM_LOCK_IV; |
|
res->l_requested = DLM_LOCK_IV; |
|
res->l_blocking = DLM_LOCK_IV; |
|
res->l_action = OCFS2_AST_INVALID; |
|
res->l_unlock_action = OCFS2_UNLOCK_INVALID; |
|
|
|
res->l_flags = OCFS2_LOCK_INITIALIZED; |
|
|
|
ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); |
|
|
|
ocfs2_init_lock_stats(res); |
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
|
if (type != OCFS2_LOCK_TYPE_OPEN) |
|
lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type], |
|
&lockdep_keys[type], 0); |
|
else |
|
res->l_lockdep_map.key = NULL; |
|
#endif |
|
} |
|
|
|
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) |
|
{ |
|
/* This also clears out the lock status block */ |
|
memset(res, 0, sizeof(struct ocfs2_lock_res)); |
|
spin_lock_init(&res->l_lock); |
|
init_waitqueue_head(&res->l_event); |
|
INIT_LIST_HEAD(&res->l_blocked_list); |
|
INIT_LIST_HEAD(&res->l_mask_waiters); |
|
INIT_LIST_HEAD(&res->l_holders); |
|
} |
|
|
|
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, |
|
enum ocfs2_lock_type type, |
|
unsigned int generation, |
|
struct inode *inode) |
|
{ |
|
struct ocfs2_lock_res_ops *ops; |
|
|
|
switch(type) { |
|
case OCFS2_LOCK_TYPE_RW: |
|
ops = &ocfs2_inode_rw_lops; |
|
break; |
|
case OCFS2_LOCK_TYPE_META: |
|
ops = &ocfs2_inode_inode_lops; |
|
break; |
|
case OCFS2_LOCK_TYPE_OPEN: |
|
ops = &ocfs2_inode_open_lops; |
|
break; |
|
default: |
|
mlog_bug_on_msg(1, "type: %d\n", type); |
|
ops = NULL; /* thanks, gcc */ |
|
break; |
|
} |
|
|
|
ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
|
generation, res->l_name); |
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
|
} |
|
|
|
static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct inode *inode = ocfs2_lock_res_inode(lockres); |
|
|
|
return OCFS2_SB(inode->i_sb); |
|
} |
|
|
|
static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_mem_dqinfo *info = lockres->l_priv; |
|
|
|
return OCFS2_SB(info->dqi_gi.dqi_sb); |
|
} |
|
|
|
static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_file_private *fp = lockres->l_priv; |
|
|
|
return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); |
|
} |
|
|
|
static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
|
{ |
|
__be64 inode_blkno_be; |
|
|
|
memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], |
|
sizeof(__be64)); |
|
|
|
return be64_to_cpu(inode_blkno_be); |
|
} |
|
|
|
static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_dentry_lock *dl = lockres->l_priv; |
|
|
|
return OCFS2_SB(dl->dl_inode->i_sb); |
|
} |
|
|
|
void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
|
u64 parent, struct inode *inode) |
|
{ |
|
int len; |
|
u64 inode_blkno = OCFS2_I(inode)->ip_blkno; |
|
__be64 inode_blkno_be = cpu_to_be64(inode_blkno); |
|
struct ocfs2_lock_res *lockres = &dl->dl_lockres; |
|
|
|
ocfs2_lock_res_init_once(lockres); |
|
|
|
/* |
|
* Unfortunately, the standard lock naming scheme won't work |
|
* here because we have two 16 byte values to use. Instead, |
|
* we'll stuff the inode number as a binary value. We still |
|
* want error prints to show something without garbling the |
|
* display, so drop a null byte in there before the inode |
|
* number. A future version of OCFS2 will likely use all |
|
* binary lock names. The stringified names have been a |
|
* tremendous aid in debugging, but now that the debugfs |
|
* interface exists, we can mangle things there if need be. |
|
* |
|
* NOTE: We also drop the standard "pad" value (the total lock |
|
* name size stays the same though - the last part is all |
|
* zeros due to the memset in ocfs2_lock_res_init_once() |
|
*/ |
|
len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, |
|
"%c%016llx", |
|
ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), |
|
(long long)parent); |
|
|
|
BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); |
|
|
|
memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, |
|
sizeof(__be64)); |
|
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, |
|
OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, |
|
dl); |
|
} |
|
|
|
static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, |
|
struct ocfs2_super *osb) |
|
{ |
|
/* Superblock lockres doesn't come from a slab so we call init |
|
* once on it manually. */ |
|
ocfs2_lock_res_init_once(res); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
|
0, res->l_name); |
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
|
&ocfs2_super_lops, osb); |
|
} |
|
|
|
static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, |
|
struct ocfs2_super *osb) |
|
{ |
|
/* Rename lockres doesn't come from a slab so we call init |
|
* once on it manually. */ |
|
ocfs2_lock_res_init_once(res); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, |
|
&ocfs2_rename_lops, osb); |
|
} |
|
|
|
static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
|
struct ocfs2_super *osb) |
|
{ |
|
/* nfs_sync lockres doesn't come from a slab so we call init |
|
* once on it manually. */ |
|
ocfs2_lock_res_init_once(res); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); |
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, |
|
&ocfs2_nfs_sync_lops, osb); |
|
} |
|
|
|
static void ocfs2_nfs_sync_lock_init(struct ocfs2_super *osb) |
|
{ |
|
ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); |
|
init_rwsem(&osb->nfs_sync_rwlock); |
|
} |
|
|
|
void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb) |
|
{ |
|
struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; |
|
|
|
/* Only one trimfs thread are allowed to work at the same time. */ |
|
mutex_lock(&osb->obs_trim_fs_mutex); |
|
|
|
ocfs2_lock_res_init_once(lockres); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name); |
|
ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS, |
|
&ocfs2_trim_fs_lops, osb); |
|
} |
|
|
|
void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb) |
|
{ |
|
struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; |
|
|
|
ocfs2_simple_drop_lockres(osb, lockres); |
|
ocfs2_lock_res_free(lockres); |
|
|
|
mutex_unlock(&osb->obs_trim_fs_mutex); |
|
} |
|
|
|
static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
|
struct ocfs2_super *osb) |
|
{ |
|
ocfs2_lock_res_init_once(res); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); |
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, |
|
&ocfs2_orphan_scan_lops, osb); |
|
} |
|
|
|
void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_file_private *fp) |
|
{ |
|
struct inode *inode = fp->fp_file->f_mapping->host; |
|
struct ocfs2_inode_info *oi = OCFS2_I(inode); |
|
|
|
ocfs2_lock_res_init_once(lockres); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, |
|
inode->i_generation, lockres->l_name); |
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, |
|
OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, |
|
fp); |
|
lockres->l_flags |= OCFS2_LOCK_NOCACHE; |
|
} |
|
|
|
void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_mem_dqinfo *info) |
|
{ |
|
ocfs2_lock_res_init_once(lockres); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, |
|
0, lockres->l_name); |
|
ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, |
|
OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, |
|
info); |
|
} |
|
|
|
void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_super *osb, u64 ref_blkno, |
|
unsigned int generation) |
|
{ |
|
ocfs2_lock_res_init_once(lockres); |
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, |
|
generation, lockres->l_name); |
|
ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, |
|
&ocfs2_refcount_block_lops, osb); |
|
} |
|
|
|
void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
|
{ |
|
if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
|
return; |
|
|
|
ocfs2_remove_lockres_tracking(res); |
|
|
|
mlog_bug_on_msg(!list_empty(&res->l_blocked_list), |
|
"Lockres %s is on the blocked list\n", |
|
res->l_name); |
|
mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), |
|
"Lockres %s has mask waiters pending\n", |
|
res->l_name); |
|
mlog_bug_on_msg(spin_is_locked(&res->l_lock), |
|
"Lockres %s is locked\n", |
|
res->l_name); |
|
mlog_bug_on_msg(res->l_ro_holders, |
|
"Lockres %s has %u ro holders\n", |
|
res->l_name, res->l_ro_holders); |
|
mlog_bug_on_msg(res->l_ex_holders, |
|
"Lockres %s has %u ex holders\n", |
|
res->l_name, res->l_ex_holders); |
|
|
|
/* Need to clear out the lock status block for the dlm */ |
|
memset(&res->l_lksb, 0, sizeof(res->l_lksb)); |
|
|
|
res->l_flags = 0UL; |
|
} |
|
|
|
/* |
|
* Keep a list of processes who have interest in a lockres. |
|
* Note: this is now only uesed for check recursive cluster locking. |
|
*/ |
|
static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_lock_holder *oh) |
|
{ |
|
INIT_LIST_HEAD(&oh->oh_list); |
|
oh->oh_owner_pid = get_pid(task_pid(current)); |
|
|
|
spin_lock(&lockres->l_lock); |
|
list_add_tail(&oh->oh_list, &lockres->l_holders); |
|
spin_unlock(&lockres->l_lock); |
|
} |
|
|
|
static struct ocfs2_lock_holder * |
|
ocfs2_pid_holder(struct ocfs2_lock_res *lockres, |
|
struct pid *pid) |
|
{ |
|
struct ocfs2_lock_holder *oh; |
|
|
|
spin_lock(&lockres->l_lock); |
|
list_for_each_entry(oh, &lockres->l_holders, oh_list) { |
|
if (oh->oh_owner_pid == pid) { |
|
spin_unlock(&lockres->l_lock); |
|
return oh; |
|
} |
|
} |
|
spin_unlock(&lockres->l_lock); |
|
return NULL; |
|
} |
|
|
|
static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_lock_holder *oh) |
|
{ |
|
spin_lock(&lockres->l_lock); |
|
list_del(&oh->oh_list); |
|
spin_unlock(&lockres->l_lock); |
|
|
|
put_pid(oh->oh_owner_pid); |
|
} |
|
|
|
|
|
static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
|
int level) |
|
{ |
|
BUG_ON(!lockres); |
|
|
|
switch(level) { |
|
case DLM_LOCK_EX: |
|
lockres->l_ex_holders++; |
|
break; |
|
case DLM_LOCK_PR: |
|
lockres->l_ro_holders++; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, |
|
int level) |
|
{ |
|
BUG_ON(!lockres); |
|
|
|
switch(level) { |
|
case DLM_LOCK_EX: |
|
BUG_ON(!lockres->l_ex_holders); |
|
lockres->l_ex_holders--; |
|
break; |
|
case DLM_LOCK_PR: |
|
BUG_ON(!lockres->l_ro_holders); |
|
lockres->l_ro_holders--; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* WARNING: This function lives in a world where the only three lock |
|
* levels are EX, PR, and NL. It *will* have to be adjusted when more |
|
* lock types are added. */ |
|
static inline int ocfs2_highest_compat_lock_level(int level) |
|
{ |
|
int new_level = DLM_LOCK_EX; |
|
|
|
if (level == DLM_LOCK_EX) |
|
new_level = DLM_LOCK_NL; |
|
else if (level == DLM_LOCK_PR) |
|
new_level = DLM_LOCK_PR; |
|
return new_level; |
|
} |
|
|
|
static void lockres_set_flags(struct ocfs2_lock_res *lockres, |
|
unsigned long newflags) |
|
{ |
|
struct ocfs2_mask_waiter *mw, *tmp; |
|
|
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
lockres->l_flags = newflags; |
|
|
|
list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
|
continue; |
|
|
|
list_del_init(&mw->mw_item); |
|
mw->mw_status = 0; |
|
complete(&mw->mw_complete); |
|
ocfs2_track_lock_wait(lockres); |
|
} |
|
} |
|
static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) |
|
{ |
|
lockres_set_flags(lockres, lockres->l_flags | or); |
|
} |
|
static void lockres_clear_flags(struct ocfs2_lock_res *lockres, |
|
unsigned long clear) |
|
{ |
|
lockres_set_flags(lockres, lockres->l_flags & ~clear); |
|
} |
|
|
|
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) |
|
{ |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
|
BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
|
|
|
lockres->l_level = lockres->l_requested; |
|
if (lockres->l_level <= |
|
ocfs2_highest_compat_lock_level(lockres->l_blocking)) { |
|
lockres->l_blocking = DLM_LOCK_NL; |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
|
} |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
} |
|
|
|
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) |
|
{ |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
|
|
|
/* Convert from RO to EX doesn't really need anything as our |
|
* information is already up to data. Convert from NL to |
|
* *anything* however should mark ourselves as needing an |
|
* update */ |
|
if (lockres->l_level == DLM_LOCK_NL && |
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
|
|
|
lockres->l_level = lockres->l_requested; |
|
|
|
/* |
|
* We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing |
|
* the OCFS2_LOCK_BUSY flag to prevent the dc thread from |
|
* downconverting the lock before the upconvert has fully completed. |
|
* Do not prevent the dc thread from downconverting if NONBLOCK lock |
|
* had already returned. |
|
*/ |
|
if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
|
lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
|
else |
|
lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); |
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
} |
|
|
|
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) |
|
{ |
|
BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
|
|
|
if (lockres->l_requested > DLM_LOCK_NL && |
|
!(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
|
|
|
lockres->l_level = lockres->l_requested; |
|
lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
} |
|
|
|
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
|
int level) |
|
{ |
|
int needs_downconvert = 0; |
|
|
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
if (level > lockres->l_blocking) { |
|
/* only schedule a downconvert if we haven't already scheduled |
|
* one that goes low enough to satisfy the level we're |
|
* blocking. this also catches the case where we get |
|
* duplicate BASTs */ |
|
if (ocfs2_highest_compat_lock_level(level) < |
|
ocfs2_highest_compat_lock_level(lockres->l_blocking)) |
|
needs_downconvert = 1; |
|
|
|
lockres->l_blocking = level; |
|
} |
|
|
|
mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
|
lockres->l_name, level, lockres->l_level, lockres->l_blocking, |
|
needs_downconvert); |
|
|
|
if (needs_downconvert) |
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); |
|
mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
|
return needs_downconvert; |
|
} |
|
|
|
/* |
|
* OCFS2_LOCK_PENDING and l_pending_gen. |
|
* |
|
* Why does OCFS2_LOCK_PENDING exist? To close a race between setting |
|
* OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() |
|
* for more details on the race. |
|
* |
|
* OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces |
|
* a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() |
|
* returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear |
|
* OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, |
|
* the caller is going to try to clear PENDING again. If nothing else is |
|
* happening, __lockres_clear_pending() sees PENDING is unset and does |
|
* nothing. |
|
* |
|
* But what if another path (eg downconvert thread) has just started a |
|
* new locking action? The other path has re-set PENDING. Our path |
|
* cannot clear PENDING, because that will re-open the original race |
|
* window. |
|
* |
|
* [Example] |
|
* |
|
* ocfs2_meta_lock() |
|
* ocfs2_cluster_lock() |
|
* set BUSY |
|
* set PENDING |
|
* drop l_lock |
|
* ocfs2_dlm_lock() |
|
* ocfs2_locking_ast() ocfs2_downconvert_thread() |
|
* clear PENDING ocfs2_unblock_lock() |
|
* take_l_lock |
|
* !BUSY |
|
* ocfs2_prepare_downconvert() |
|
* set BUSY |
|
* set PENDING |
|
* drop l_lock |
|
* take l_lock |
|
* clear PENDING |
|
* drop l_lock |
|
* <window> |
|
* ocfs2_dlm_lock() |
|
* |
|
* So as you can see, we now have a window where l_lock is not held, |
|
* PENDING is not set, and ocfs2_dlm_lock() has not been called. |
|
* |
|
* The core problem is that ocfs2_cluster_lock() has cleared the PENDING |
|
* set by ocfs2_prepare_downconvert(). That wasn't nice. |
|
* |
|
* To solve this we introduce l_pending_gen. A call to |
|
* lockres_clear_pending() will only do so when it is passed a generation |
|
* number that matches the lockres. lockres_set_pending() will return the |
|
* current generation number. When ocfs2_cluster_lock() goes to clear |
|
* PENDING, it passes the generation it got from set_pending(). In our |
|
* example above, the generation numbers will *not* match. Thus, |
|
* ocfs2_cluster_lock() will not clear the PENDING set by |
|
* ocfs2_prepare_downconvert(). |
|
*/ |
|
|
|
/* Unlocked version for ocfs2_locking_ast() */ |
|
static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, |
|
unsigned int generation, |
|
struct ocfs2_super *osb) |
|
{ |
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
/* |
|
* The ast and locking functions can race us here. The winner |
|
* will clear pending, the loser will not. |
|
*/ |
|
if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || |
|
(lockres->l_pending_gen != generation)) |
|
return; |
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); |
|
lockres->l_pending_gen++; |
|
|
|
/* |
|
* The downconvert thread may have skipped us because we |
|
* were PENDING. Wake it up. |
|
*/ |
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) |
|
ocfs2_wake_downconvert_thread(osb); |
|
} |
|
|
|
/* Locked version for callers of ocfs2_dlm_lock() */ |
|
static void lockres_clear_pending(struct ocfs2_lock_res *lockres, |
|
unsigned int generation, |
|
struct ocfs2_super *osb) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
__lockres_clear_pending(lockres, generation, osb); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
} |
|
|
|
static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) |
|
{ |
|
assert_spin_locked(&lockres->l_lock); |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_PENDING); |
|
|
|
return lockres->l_pending_gen; |
|
} |
|
|
|
static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
|
{ |
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
|
int needs_downconvert; |
|
unsigned long flags; |
|
|
|
BUG_ON(level <= DLM_LOCK_NL); |
|
|
|
mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
|
"type %s\n", lockres->l_name, level, lockres->l_level, |
|
ocfs2_lock_type_string(lockres->l_type)); |
|
|
|
/* |
|
* We can skip the bast for locks which don't enable caching - |
|
* they'll be dropped at the earliest possible time anyway. |
|
*/ |
|
if (lockres->l_flags & OCFS2_LOCK_NOCACHE) |
|
return; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
needs_downconvert = ocfs2_generic_handle_bast(lockres, level); |
|
if (needs_downconvert) |
|
ocfs2_schedule_blocked_lock(osb, lockres); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
wake_up(&lockres->l_event); |
|
|
|
ocfs2_wake_downconvert_thread(osb); |
|
} |
|
|
|
static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
|
{ |
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
|
unsigned long flags; |
|
int status; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
|
|
status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
|
|
|
if (status == -EAGAIN) { |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
goto out; |
|
} |
|
|
|
if (status) { |
|
mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
|
lockres->l_name, status); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
return; |
|
} |
|
|
|
mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
|
"level %d => %d\n", lockres->l_name, lockres->l_action, |
|
lockres->l_unlock_action, lockres->l_level, lockres->l_requested); |
|
|
|
switch(lockres->l_action) { |
|
case OCFS2_AST_ATTACH: |
|
ocfs2_generic_handle_attach_action(lockres); |
|
lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
|
break; |
|
case OCFS2_AST_CONVERT: |
|
ocfs2_generic_handle_convert_action(lockres); |
|
break; |
|
case OCFS2_AST_DOWNCONVERT: |
|
ocfs2_generic_handle_downconvert_action(lockres); |
|
break; |
|
default: |
|
mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
|
"flags 0x%lx, unlock: %u\n", |
|
lockres->l_name, lockres->l_action, lockres->l_flags, |
|
lockres->l_unlock_action); |
|
BUG(); |
|
} |
|
out: |
|
/* set it to something invalid so if we get called again we |
|
* can catch it. */ |
|
lockres->l_action = OCFS2_AST_INVALID; |
|
|
|
/* Did we try to cancel this lock? Clear that state */ |
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) |
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
|
|
|
/* |
|
* We may have beaten the locking functions here. We certainly |
|
* know that dlm_lock() has been called :-) |
|
* Because we can't have two lock calls in flight at once, we |
|
* can use lockres->l_pending_gen. |
|
*/ |
|
__lockres_clear_pending(lockres, lockres->l_pending_gen, osb); |
|
|
|
wake_up(&lockres->l_event); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
} |
|
|
|
static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
|
{ |
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
|
unsigned long flags; |
|
|
|
mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
|
lockres->l_name, lockres->l_unlock_action); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (error) { |
|
mlog(ML_ERROR, "Dlm passes error %d for lock %s, " |
|
"unlock_action %d\n", error, lockres->l_name, |
|
lockres->l_unlock_action); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
return; |
|
} |
|
|
|
switch(lockres->l_unlock_action) { |
|
case OCFS2_UNLOCK_CANCEL_CONVERT: |
|
mlog(0, "Cancel convert success for %s\n", lockres->l_name); |
|
lockres->l_action = OCFS2_AST_INVALID; |
|
/* Downconvert thread may have requeued this lock, we |
|
* need to wake it. */ |
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) |
|
ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); |
|
break; |
|
case OCFS2_UNLOCK_DROP_LOCK: |
|
lockres->l_level = DLM_LOCK_IV; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
|
wake_up(&lockres->l_event); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
} |
|
|
|
/* |
|
* This is the filesystem locking protocol. It provides the lock handling |
|
* hooks for the underlying DLM. It has a maximum version number. |
|
* The version number allows interoperability with systems running at |
|
* the same major number and an equal or smaller minor number. |
|
* |
|
* Whenever the filesystem does new things with locks (adds or removes a |
|
* lock, orders them differently, does different things underneath a lock), |
|
* the version must be changed. The protocol is negotiated when joining |
|
* the dlm domain. A node may join the domain if its major version is |
|
* identical to all other nodes and its minor version is greater than |
|
* or equal to all other nodes. When its minor version is greater than |
|
* the other nodes, it will run at the minor version specified by the |
|
* other nodes. |
|
* |
|
* If a locking change is made that will not be compatible with older |
|
* versions, the major number must be increased and the minor version set |
|
* to zero. If a change merely adds a behavior that can be disabled when |
|
* speaking to older versions, the minor version must be increased. If a |
|
* change adds a fully backwards compatible change (eg, LVB changes that |
|
* are just ignored by older versions), the version does not need to be |
|
* updated. |
|
*/ |
|
static struct ocfs2_locking_protocol lproto = { |
|
.lp_max_version = { |
|
.pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, |
|
.pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, |
|
}, |
|
.lp_lock_ast = ocfs2_locking_ast, |
|
.lp_blocking_ast = ocfs2_blocking_ast, |
|
.lp_unlock_ast = ocfs2_unlock_ast, |
|
}; |
|
|
|
void ocfs2_set_locking_protocol(void) |
|
{ |
|
ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); |
|
} |
|
|
|
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
|
int convert) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
|
lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
|
if (convert) |
|
lockres->l_action = OCFS2_AST_INVALID; |
|
else |
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
wake_up(&lockres->l_event); |
|
} |
|
|
|
/* Note: If we detect another process working on the lock (i.e., |
|
* OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller |
|
* to do the right thing in that case. |
|
*/ |
|
static int ocfs2_lock_create(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int level, |
|
u32 dlm_flags) |
|
{ |
|
int ret = 0; |
|
unsigned long flags; |
|
unsigned int gen; |
|
|
|
mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
|
dlm_flags); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || |
|
(lockres->l_flags & OCFS2_LOCK_BUSY)) { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
goto bail; |
|
} |
|
|
|
lockres->l_action = OCFS2_AST_ATTACH; |
|
lockres->l_requested = level; |
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
|
gen = lockres_set_pending(lockres); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ret = ocfs2_dlm_lock(osb->cconn, |
|
level, |
|
&lockres->l_lksb, |
|
dlm_flags, |
|
lockres->l_name, |
|
OCFS2_LOCK_ID_MAX_LEN - 1); |
|
lockres_clear_pending(lockres, gen, osb); |
|
if (ret) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
|
ocfs2_recover_from_dlm_error(lockres, 1); |
|
} |
|
|
|
mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
|
|
|
bail: |
|
return ret; |
|
} |
|
|
|
static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, |
|
int flag) |
|
{ |
|
unsigned long flags; |
|
int ret; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
ret = lockres->l_flags & flag; |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
return ret; |
|
} |
|
|
|
static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) |
|
|
|
{ |
|
wait_event(lockres->l_event, |
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); |
|
} |
|
|
|
static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) |
|
|
|
{ |
|
wait_event(lockres->l_event, |
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); |
|
} |
|
|
|
/* predict what lock level we'll be dropping down to on behalf |
|
* of another node, and return true if the currently wanted |
|
* level will be compatible with it. */ |
|
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
|
int wanted) |
|
{ |
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
|
|
|
return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); |
|
} |
|
|
|
static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) |
|
{ |
|
INIT_LIST_HEAD(&mw->mw_item); |
|
init_completion(&mw->mw_complete); |
|
ocfs2_init_start_time(mw); |
|
} |
|
|
|
static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) |
|
{ |
|
wait_for_completion(&mw->mw_complete); |
|
/* Re-arm the completion in case we want to wait on it again */ |
|
reinit_completion(&mw->mw_complete); |
|
return mw->mw_status; |
|
} |
|
|
|
static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_mask_waiter *mw, |
|
unsigned long mask, |
|
unsigned long goal) |
|
{ |
|
BUG_ON(!list_empty(&mw->mw_item)); |
|
|
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); |
|
mw->mw_mask = mask; |
|
mw->mw_goal = goal; |
|
ocfs2_track_lock_wait(lockres); |
|
} |
|
|
|
/* returns 0 if the mw that was removed was already satisfied, -EBUSY |
|
* if the mask still hadn't reached its goal */ |
|
static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_mask_waiter *mw) |
|
{ |
|
int ret = 0; |
|
|
|
assert_spin_locked(&lockres->l_lock); |
|
if (!list_empty(&mw->mw_item)) { |
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
|
ret = -EBUSY; |
|
|
|
list_del_init(&mw->mw_item); |
|
init_completion(&mw->mw_complete); |
|
ocfs2_track_lock_wait(lockres); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
|
struct ocfs2_mask_waiter *mw) |
|
{ |
|
unsigned long flags; |
|
int ret = 0; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
ret = __lockres_remove_mask_waiter(lockres, mw); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
return ret; |
|
|
|
} |
|
|
|
static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int ret; |
|
|
|
ret = wait_for_completion_interruptible(&mw->mw_complete); |
|
if (ret) |
|
lockres_remove_mask_waiter(lockres, mw); |
|
else |
|
ret = mw->mw_status; |
|
/* Re-arm the completion in case we want to wait on it again */ |
|
reinit_completion(&mw->mw_complete); |
|
return ret; |
|
} |
|
|
|
static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int level, |
|
u32 lkm_flags, |
|
int arg_flags, |
|
int l_subclass, |
|
unsigned long caller_ip) |
|
{ |
|
struct ocfs2_mask_waiter mw; |
|
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
|
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ |
|
unsigned long flags; |
|
unsigned int gen; |
|
int noqueue_attempted = 0; |
|
int dlm_locked = 0; |
|
int kick_dc = 0; |
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
|
mlog_errno(-EINVAL); |
|
return -EINVAL; |
|
} |
|
|
|
ocfs2_init_mask_waiter(&mw); |
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
|
lkm_flags |= DLM_LKF_VALBLK; |
|
|
|
again: |
|
wait = 0; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
|
|
if (catch_signals && signal_pending(current)) { |
|
ret = -ERESTARTSYS; |
|
goto unlock; |
|
} |
|
|
|
mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
|
"Cluster lock called on freeing lockres %s! flags " |
|
"0x%lx\n", lockres->l_name, lockres->l_flags); |
|
|
|
/* We only compare against the currently granted level |
|
* here. If the lock is blocked waiting on a downconvert, |
|
* we'll get caught below. */ |
|
if (lockres->l_flags & OCFS2_LOCK_BUSY && |
|
level > lockres->l_level) { |
|
/* is someone sitting in dlm_lock? If so, wait on |
|
* them. */ |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
|
wait = 1; |
|
goto unlock; |
|
} |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
|
/* |
|
* We've upconverted. If the lock now has a level we can |
|
* work with, we take it. If, however, the lock is not at the |
|
* required level, we go thru the full cycle. One way this could |
|
* happen is if a process requesting an upconvert to PR is |
|
* closely followed by another requesting upconvert to an EX. |
|
* If the process requesting EX lands here, we want it to |
|
* continue attempting to upconvert and let the process |
|
* requesting PR take the lock. |
|
* If multiple processes request upconvert to PR, the first one |
|
* here will take the lock. The others will have to go thru the |
|
* OCFS2_LOCK_BLOCKED check to ensure that there is no pending |
|
* downconvert request. |
|
*/ |
|
if (level <= lockres->l_level) |
|
goto update_holders; |
|
} |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
|
!ocfs2_may_continue_on_blocked_lock(lockres, level)) { |
|
/* is the lock is currently blocked on behalf of |
|
* another node */ |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); |
|
wait = 1; |
|
goto unlock; |
|
} |
|
|
|
if (level > lockres->l_level) { |
|
if (noqueue_attempted > 0) { |
|
ret = -EAGAIN; |
|
goto unlock; |
|
} |
|
if (lkm_flags & DLM_LKF_NOQUEUE) |
|
noqueue_attempted = 1; |
|
|
|
if (lockres->l_action != OCFS2_AST_INVALID) |
|
mlog(ML_ERROR, "lockres %s has action %u pending\n", |
|
lockres->l_name, lockres->l_action); |
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
|
lockres->l_action = OCFS2_AST_ATTACH; |
|
lkm_flags &= ~DLM_LKF_CONVERT; |
|
} else { |
|
lockres->l_action = OCFS2_AST_CONVERT; |
|
lkm_flags |= DLM_LKF_CONVERT; |
|
} |
|
|
|
lockres->l_requested = level; |
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
|
gen = lockres_set_pending(lockres); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
BUG_ON(level == DLM_LOCK_IV); |
|
BUG_ON(level == DLM_LOCK_NL); |
|
|
|
mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
|
lockres->l_name, lockres->l_level, level); |
|
|
|
/* call dlm_lock to upgrade lock now */ |
|
ret = ocfs2_dlm_lock(osb->cconn, |
|
level, |
|
&lockres->l_lksb, |
|
lkm_flags, |
|
lockres->l_name, |
|
OCFS2_LOCK_ID_MAX_LEN - 1); |
|
lockres_clear_pending(lockres, gen, osb); |
|
if (ret) { |
|
if (!(lkm_flags & DLM_LKF_NOQUEUE) || |
|
(ret != -EAGAIN)) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", |
|
ret, lockres); |
|
} |
|
ocfs2_recover_from_dlm_error(lockres, 1); |
|
goto out; |
|
} |
|
dlm_locked = 1; |
|
|
|
mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
|
lockres->l_name); |
|
|
|
/* At this point we've gone inside the dlm and need to |
|
* complete our work regardless. */ |
|
catch_signals = 0; |
|
|
|
/* wait for busy to clear and carry on */ |
|
goto again; |
|
} |
|
|
|
update_holders: |
|
/* Ok, if we get here then we're good to go. */ |
|
ocfs2_inc_holders(lockres, level); |
|
|
|
ret = 0; |
|
unlock: |
|
lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
|
|
|
/* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
|
kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); |
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
if (kick_dc) |
|
ocfs2_wake_downconvert_thread(osb); |
|
out: |
|
/* |
|
* This is helping work around a lock inversion between the page lock |
|
* and dlm locks. One path holds the page lock while calling aops |
|
* which block acquiring dlm locks. The voting thread holds dlm |
|
* locks while acquiring page locks while down converting data locks. |
|
* This block is helping an aop path notice the inversion and back |
|
* off to unlock its page lock before trying the dlm lock again. |
|
*/ |
|
if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && |
|
mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { |
|
wait = 0; |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (__lockres_remove_mask_waiter(lockres, &mw)) { |
|
if (dlm_locked) |
|
lockres_or_flags(lockres, |
|
OCFS2_LOCK_NONBLOCK_FINISHED); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
ret = -EAGAIN; |
|
} else { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
goto again; |
|
} |
|
} |
|
if (wait) { |
|
ret = ocfs2_wait_for_mask(&mw); |
|
if (ret == 0) |
|
goto again; |
|
mlog_errno(ret); |
|
} |
|
ocfs2_update_lock_stats(lockres, level, &mw, ret); |
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
|
if (!ret && lockres->l_lockdep_map.key != NULL) { |
|
if (level == DLM_LOCK_PR) |
|
rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, |
|
!!(arg_flags & OCFS2_META_LOCK_NOQUEUE), |
|
caller_ip); |
|
else |
|
rwsem_acquire(&lockres->l_lockdep_map, l_subclass, |
|
!!(arg_flags & OCFS2_META_LOCK_NOQUEUE), |
|
caller_ip); |
|
} |
|
#endif |
|
return ret; |
|
} |
|
|
|
static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int level, |
|
u32 lkm_flags, |
|
int arg_flags) |
|
{ |
|
return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, |
|
0, _RET_IP_); |
|
} |
|
|
|
|
|
static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int level, |
|
unsigned long caller_ip) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
ocfs2_dec_holders(lockres, level); |
|
ocfs2_downconvert_on_unlock(osb, lockres); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
|
if (lockres->l_lockdep_map.key != NULL) |
|
rwsem_release(&lockres->l_lockdep_map, caller_ip); |
|
#endif |
|
} |
|
|
|
static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int ex, |
|
int local) |
|
{ |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
unsigned long flags; |
|
u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
|
lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
|
} |
|
|
|
/* Grants us an EX lock on the data and metadata resources, skipping |
|
* the normal cluster directory lookup. Use this ONLY on newly created |
|
* inodes which other nodes can't possibly see, and which haven't been |
|
* hashed in the inode hash yet. This can give us a good performance |
|
* increase as it'll skip the network broadcast normally associated |
|
* with creating a new lock resource. */ |
|
int ocfs2_create_new_inode_locks(struct inode *inode) |
|
{ |
|
int ret; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
BUG_ON(!ocfs2_inode_is_new(inode)); |
|
|
|
mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
|
|
|
/* NOTE: That we don't increment any of the holder counts, nor |
|
* do we add anything to a journal handle. Since this is |
|
* supposed to be a new inode which the cluster doesn't know |
|
* about yet, there is no need to. As far as the LVB handling |
|
* is concerned, this is basically like acquiring an EX lock |
|
* on a resource which has an invalid one -- we'll set it |
|
* valid when we release the EX. */ |
|
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
|
if (ret) { |
|
mlog_errno(ret); |
|
goto bail; |
|
} |
|
|
|
/* |
|
* We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
|
* don't use a generation in their lock names. |
|
*/ |
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
|
if (ret) { |
|
mlog_errno(ret); |
|
goto bail; |
|
} |
|
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
|
if (ret) |
|
mlog_errno(ret); |
|
|
|
bail: |
|
return ret; |
|
} |
|
|
|
int ocfs2_rw_lock(struct inode *inode, int write) |
|
{ |
|
int status, level; |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu take %s RW lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
write ? "EXMODE" : "PRMODE"); |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
lockres = &OCFS2_I(inode)->ip_rw_lockres; |
|
|
|
level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
return status; |
|
} |
|
|
|
int ocfs2_try_rw_lock(struct inode *inode, int write) |
|
{ |
|
int status, level; |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu try to take %s RW lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
write ? "EXMODE" : "PRMODE"); |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
lockres = &OCFS2_I(inode)->ip_rw_lockres; |
|
|
|
level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
|
return status; |
|
} |
|
|
|
void ocfs2_rw_unlock(struct inode *inode, int write) |
|
{ |
|
int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu drop %s RW lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
write ? "EXMODE" : "PRMODE"); |
|
|
|
if (!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
} |
|
|
|
/* |
|
* ocfs2_open_lock always get PR mode lock. |
|
*/ |
|
int ocfs2_open_lock(struct inode *inode) |
|
{ |
|
int status = 0; |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu take PRMODE open lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno); |
|
|
|
if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
|
goto out; |
|
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_PR, 0, 0); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
out: |
|
return status; |
|
} |
|
|
|
int ocfs2_try_open_lock(struct inode *inode, int write) |
|
{ |
|
int status = 0, level; |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu try to take %s open lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
write ? "EXMODE" : "PRMODE"); |
|
|
|
if (ocfs2_is_hard_readonly(osb)) { |
|
if (write) |
|
status = -EROFS; |
|
goto out; |
|
} |
|
|
|
if (ocfs2_mount_local(osb)) |
|
goto out; |
|
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres; |
|
|
|
level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
|
|
/* |
|
* The file system may already holding a PRMODE/EXMODE open lock. |
|
* Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
|
* other nodes and the -EAGAIN will indicate to the caller that |
|
* this inode is still in use. |
|
*/ |
|
status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
|
|
|
out: |
|
return status; |
|
} |
|
|
|
/* |
|
* ocfs2_open_unlock unlock PR and EX mode open locks. |
|
*/ |
|
void ocfs2_open_unlock(struct inode *inode) |
|
{ |
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu drop open lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno); |
|
|
|
if (ocfs2_mount_local(osb)) |
|
goto out; |
|
|
|
if(lockres->l_ro_holders) |
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_PR); |
|
if(lockres->l_ex_holders) |
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
|
|
|
out: |
|
return; |
|
} |
|
|
|
static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
|
int level) |
|
{ |
|
int ret; |
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
|
unsigned long flags; |
|
struct ocfs2_mask_waiter mw; |
|
|
|
ocfs2_init_mask_waiter(&mw); |
|
|
|
retry_cancel: |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
|
ret = ocfs2_prepare_cancel_convert(osb, lockres); |
|
if (ret) { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
ret = ocfs2_cancel_convert(osb, lockres); |
|
if (ret < 0) { |
|
mlog_errno(ret); |
|
goto out; |
|
} |
|
goto retry_cancel; |
|
} |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ocfs2_wait_for_mask(&mw); |
|
goto retry_cancel; |
|
} |
|
|
|
ret = -ERESTARTSYS; |
|
/* |
|
* We may still have gotten the lock, in which case there's no |
|
* point to restarting the syscall. |
|
*/ |
|
if (lockres->l_level == level) |
|
ret = 0; |
|
|
|
mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, |
|
lockres->l_flags, lockres->l_level, lockres->l_action); |
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* |
|
* ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of |
|
* flock() calls. The locking approach this requires is sufficiently |
|
* different from all other cluster lock types that we implement a |
|
* separate path to the "low-level" dlm calls. In particular: |
|
* |
|
* - No optimization of lock levels is done - we take at exactly |
|
* what's been requested. |
|
* |
|
* - No lock caching is employed. We immediately downconvert to |
|
* no-lock at unlock time. This also means flock locks never go on |
|
* the blocking list). |
|
* |
|
* - Since userspace can trivially deadlock itself with flock, we make |
|
* sure to allow cancellation of a misbehaving applications flock() |
|
* request. |
|
* |
|
* - Access to any flock lockres doesn't require concurrency, so we |
|
* can simplify the code by requiring the caller to guarantee |
|
* serialization of dlmglue flock calls. |
|
*/ |
|
int ocfs2_file_lock(struct file *file, int ex, int trylock) |
|
{ |
|
int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; |
|
unsigned long flags; |
|
struct ocfs2_file_private *fp = file->private_data; |
|
struct ocfs2_lock_res *lockres = &fp->fp_flock; |
|
struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); |
|
struct ocfs2_mask_waiter mw; |
|
|
|
ocfs2_init_mask_waiter(&mw); |
|
|
|
if ((lockres->l_flags & OCFS2_LOCK_BUSY) || |
|
(lockres->l_level > DLM_LOCK_NL)) { |
|
mlog(ML_ERROR, |
|
"File lock \"%s\" has busy or locked state: flags: 0x%lx, " |
|
"level: %u\n", lockres->l_name, lockres->l_flags, |
|
lockres->l_level); |
|
return -EINVAL; |
|
} |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
/* |
|
* Get the lock at NLMODE to start - that way we |
|
* can cancel the upconvert request if need be. |
|
*/ |
|
ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
|
if (ret < 0) { |
|
mlog_errno(ret); |
|
goto out; |
|
} |
|
|
|
ret = ocfs2_wait_for_mask(&mw); |
|
if (ret) { |
|
mlog_errno(ret); |
|
goto out; |
|
} |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
} |
|
|
|
lockres->l_action = OCFS2_AST_CONVERT; |
|
lkm_flags |= DLM_LKF_CONVERT; |
|
lockres->l_requested = level; |
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
|
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
|
lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
|
if (ret) { |
|
if (!trylock || (ret != -EAGAIN)) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
|
ret = -EINVAL; |
|
} |
|
|
|
ocfs2_recover_from_dlm_error(lockres, 1); |
|
lockres_remove_mask_waiter(lockres, &mw); |
|
goto out; |
|
} |
|
|
|
ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); |
|
if (ret == -ERESTARTSYS) { |
|
/* |
|
* Userspace can cause deadlock itself with |
|
* flock(). Current behavior locally is to allow the |
|
* deadlock, but abort the system call if a signal is |
|
* received. We follow this example, otherwise a |
|
* poorly written program could sit in kernel until |
|
* reboot. |
|
* |
|
* Handling this is a bit more complicated for Ocfs2 |
|
* though. We can't exit this function with an |
|
* outstanding lock request, so a cancel convert is |
|
* required. We intentionally overwrite 'ret' - if the |
|
* cancel fails and the lock was granted, it's easier |
|
* to just bubble success back up to the user. |
|
*/ |
|
ret = ocfs2_flock_handle_signal(lockres, level); |
|
} else if (!ret && (level > lockres->l_level)) { |
|
/* Trylock failed asynchronously */ |
|
BUG_ON(!trylock); |
|
ret = -EAGAIN; |
|
} |
|
|
|
out: |
|
|
|
mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", |
|
lockres->l_name, ex, trylock, ret); |
|
return ret; |
|
} |
|
|
|
void ocfs2_file_unlock(struct file *file) |
|
{ |
|
int ret; |
|
unsigned int gen; |
|
unsigned long flags; |
|
struct ocfs2_file_private *fp = file->private_data; |
|
struct ocfs2_lock_res *lockres = &fp->fp_flock; |
|
struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); |
|
struct ocfs2_mask_waiter mw; |
|
|
|
ocfs2_init_mask_waiter(&mw); |
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) |
|
return; |
|
|
|
if (lockres->l_level == DLM_LOCK_NL) |
|
return; |
|
|
|
mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", |
|
lockres->l_name, lockres->l_flags, lockres->l_level, |
|
lockres->l_action); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
/* |
|
* Fake a blocking ast for the downconvert code. |
|
*/ |
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); |
|
lockres->l_blocking = DLM_LOCK_EX; |
|
|
|
gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
|
if (ret) { |
|
mlog_errno(ret); |
|
return; |
|
} |
|
|
|
ret = ocfs2_wait_for_mask(&mw); |
|
if (ret) |
|
mlog_errno(ret); |
|
} |
|
|
|
static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int kick = 0; |
|
|
|
/* If we know that another node is waiting on our lock, kick |
|
* the downconvert thread * pre-emptively when we reach a release |
|
* condition. */ |
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { |
|
switch(lockres->l_blocking) { |
|
case DLM_LOCK_EX: |
|
if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
|
kick = 1; |
|
break; |
|
case DLM_LOCK_PR: |
|
if (!lockres->l_ex_holders) |
|
kick = 1; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
if (kick) |
|
ocfs2_wake_downconvert_thread(osb); |
|
} |
|
|
|
#define OCFS2_SEC_BITS 34 |
|
#define OCFS2_SEC_SHIFT (64 - OCFS2_SEC_BITS) |
|
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) |
|
|
|
/* LVB only has room for 64 bits of time here so we pack it for |
|
* now. */ |
|
static u64 ocfs2_pack_timespec(struct timespec64 *spec) |
|
{ |
|
u64 res; |
|
u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); |
|
u32 nsec = spec->tv_nsec; |
|
|
|
res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); |
|
|
|
return res; |
|
} |
|
|
|
/* Call this with the lockres locked. I am reasonably sure we don't |
|
* need ip_lock in this function as anyone who would be changing those |
|
* values is supposed to be blocked in ocfs2_inode_lock right now. */ |
|
static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
|
{ |
|
struct ocfs2_inode_info *oi = OCFS2_I(inode); |
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
|
struct ocfs2_meta_lvb *lvb; |
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
|
|
/* |
|
* Invalidate the LVB of a deleted inode - this way other |
|
* nodes are forced to go to disk and discover the new inode |
|
* status. |
|
*/ |
|
if (oi->ip_flags & OCFS2_INODE_DELETED) { |
|
lvb->lvb_version = 0; |
|
goto out; |
|
} |
|
|
|
lvb->lvb_version = OCFS2_LVB_VERSION; |
|
lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
|
lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); |
|
lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
|
lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); |
|
lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
|
lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); |
|
lvb->lvb_iatime_packed = |
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); |
|
lvb->lvb_ictime_packed = |
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); |
|
lvb->lvb_imtime_packed = |
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); |
|
lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
|
lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
|
lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
|
|
|
out: |
|
mlog_meta_lvb(0, lockres); |
|
} |
|
|
|
static void ocfs2_unpack_timespec(struct timespec64 *spec, |
|
u64 packed_time) |
|
{ |
|
spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; |
|
spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; |
|
} |
|
|
|
static int ocfs2_refresh_inode_from_lvb(struct inode *inode) |
|
{ |
|
struct ocfs2_inode_info *oi = OCFS2_I(inode); |
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
|
struct ocfs2_meta_lvb *lvb; |
|
|
|
mlog_meta_lvb(0, lockres); |
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
if (inode_wrong_type(inode, be16_to_cpu(lvb->lvb_imode))) |
|
return -ESTALE; |
|
|
|
/* We're safe here without the lockres lock... */ |
|
spin_lock(&oi->ip_lock); |
|
oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); |
|
i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); |
|
|
|
oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
|
oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
|
ocfs2_set_inode_flags(inode); |
|
|
|
/* fast-symlinks are a special case */ |
|
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) |
|
inode->i_blocks = 0; |
|
else |
|
inode->i_blocks = ocfs2_inode_sector_count(inode); |
|
|
|
i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid)); |
|
i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); |
|
inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
|
set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); |
|
ocfs2_unpack_timespec(&inode->i_atime, |
|
be64_to_cpu(lvb->lvb_iatime_packed)); |
|
ocfs2_unpack_timespec(&inode->i_mtime, |
|
be64_to_cpu(lvb->lvb_imtime_packed)); |
|
ocfs2_unpack_timespec(&inode->i_ctime, |
|
be64_to_cpu(lvb->lvb_ictime_packed)); |
|
spin_unlock(&oi->ip_lock); |
|
return 0; |
|
} |
|
|
|
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
|
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
|
&& lvb->lvb_version == OCFS2_LVB_VERSION |
|
&& be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
|
return 1; |
|
return 0; |
|
} |
|
|
|
/* Determine whether a lock resource needs to be refreshed, and |
|
* arbitrate who gets to refresh it. |
|
* |
|
* 0 means no refresh needed. |
|
* |
|
* > 0 means you need to refresh this and you MUST call |
|
* ocfs2_complete_lock_res_refresh afterwards. */ |
|
static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) |
|
{ |
|
unsigned long flags; |
|
int status = 0; |
|
|
|
refresh_check: |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
goto bail; |
|
} |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ocfs2_wait_on_refreshing_lock(lockres); |
|
goto refresh_check; |
|
} |
|
|
|
/* Ok, I'll be the one to refresh this lock. */ |
|
lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
status = 1; |
|
bail: |
|
mlog(0, "status %d\n", status); |
|
return status; |
|
} |
|
|
|
/* If status is non zero, I'll mark it as not being in refresh |
|
* anymroe, but i won't clear the needs refresh flag. */ |
|
static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, |
|
int status) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); |
|
if (!status) |
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
wake_up(&lockres->l_event); |
|
} |
|
|
|
/* may or may not return a bh if it went to disk. */ |
|
static int ocfs2_inode_lock_update(struct inode *inode, |
|
struct buffer_head **bh) |
|
{ |
|
int status = 0; |
|
struct ocfs2_inode_info *oi = OCFS2_I(inode); |
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
|
struct ocfs2_dinode *fe; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
if (ocfs2_mount_local(osb)) |
|
goto bail; |
|
|
|
spin_lock(&oi->ip_lock); |
|
if (oi->ip_flags & OCFS2_INODE_DELETED) { |
|
mlog(0, "Orphaned inode %llu was deleted while we " |
|
"were waiting on a lock. ip_flags = 0x%x\n", |
|
(unsigned long long)oi->ip_blkno, oi->ip_flags); |
|
spin_unlock(&oi->ip_lock); |
|
status = -ENOENT; |
|
goto bail; |
|
} |
|
spin_unlock(&oi->ip_lock); |
|
|
|
if (!ocfs2_should_refresh_lock_res(lockres)) |
|
goto bail; |
|
|
|
/* This will discard any caching information we might have had |
|
* for the inode metadata. */ |
|
ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
|
|
|
ocfs2_extent_map_trunc(inode, 0); |
|
|
|
if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
|
mlog(0, "Trusting LVB on inode %llu\n", |
|
(unsigned long long)oi->ip_blkno); |
|
status = ocfs2_refresh_inode_from_lvb(inode); |
|
goto bail_refresh; |
|
} else { |
|
/* Boo, we have to go to disk. */ |
|
/* read bh, cast, ocfs2_refresh_inode */ |
|
status = ocfs2_read_inode_block(inode, bh); |
|
if (status < 0) { |
|
mlog_errno(status); |
|
goto bail_refresh; |
|
} |
|
fe = (struct ocfs2_dinode *) (*bh)->b_data; |
|
if (inode_wrong_type(inode, le16_to_cpu(fe->i_mode))) { |
|
status = -ESTALE; |
|
goto bail_refresh; |
|
} |
|
|
|
/* This is a good chance to make sure we're not |
|
* locking an invalid object. ocfs2_read_inode_block() |
|
* already checked that the inode block is sane. |
|
* |
|
* We bug on a stale inode here because we checked |
|
* above whether it was wiped from disk. The wiping |
|
* node provides a guarantee that we receive that |
|
* message and can mark the inode before dropping any |
|
* locks associated with it. */ |
|
mlog_bug_on_msg(inode->i_generation != |
|
le32_to_cpu(fe->i_generation), |
|
"Invalid dinode %llu disk generation: %u " |
|
"inode->i_generation: %u\n", |
|
(unsigned long long)oi->ip_blkno, |
|
le32_to_cpu(fe->i_generation), |
|
inode->i_generation); |
|
mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || |
|
!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), |
|
"Stale dinode %llu dtime: %llu flags: 0x%x\n", |
|
(unsigned long long)oi->ip_blkno, |
|
(unsigned long long)le64_to_cpu(fe->i_dtime), |
|
le32_to_cpu(fe->i_flags)); |
|
|
|
ocfs2_refresh_inode(inode, fe); |
|
ocfs2_track_lock_refresh(lockres); |
|
} |
|
|
|
status = 0; |
|
bail_refresh: |
|
ocfs2_complete_lock_res_refresh(lockres, status); |
|
bail: |
|
return status; |
|
} |
|
|
|
static int ocfs2_assign_bh(struct inode *inode, |
|
struct buffer_head **ret_bh, |
|
struct buffer_head *passed_bh) |
|
{ |
|
int status; |
|
|
|
if (passed_bh) { |
|
/* Ok, the update went to disk for us, use the |
|
* returned bh. */ |
|
*ret_bh = passed_bh; |
|
get_bh(*ret_bh); |
|
|
|
return 0; |
|
} |
|
|
|
status = ocfs2_read_inode_block(inode, ret_bh); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
return status; |
|
} |
|
|
|
/* |
|
* returns < 0 error if the callback will never be called, otherwise |
|
* the result of the lock will be communicated via the callback. |
|
*/ |
|
int ocfs2_inode_lock_full_nested(struct inode *inode, |
|
struct buffer_head **ret_bh, |
|
int ex, |
|
int arg_flags, |
|
int subclass) |
|
{ |
|
int status, level, acquired; |
|
u32 dlm_flags; |
|
struct ocfs2_lock_res *lockres = NULL; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
struct buffer_head *local_bh = NULL; |
|
|
|
mlog(0, "inode %llu, take %s META lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
ex ? "EXMODE" : "PRMODE"); |
|
|
|
status = 0; |
|
acquired = 0; |
|
/* We'll allow faking a readonly metadata lock for |
|
* rodevices. */ |
|
if (ocfs2_is_hard_readonly(osb)) { |
|
if (ex) |
|
status = -EROFS; |
|
goto getbh; |
|
} |
|
|
|
if ((arg_flags & OCFS2_META_LOCK_GETBH) || |
|
ocfs2_mount_local(osb)) |
|
goto update; |
|
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
|
ocfs2_wait_for_recovery(osb); |
|
|
|
lockres = &OCFS2_I(inode)->ip_inode_lockres; |
|
level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
dlm_flags = 0; |
|
if (arg_flags & OCFS2_META_LOCK_NOQUEUE) |
|
dlm_flags |= DLM_LKF_NOQUEUE; |
|
|
|
status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
|
arg_flags, subclass, _RET_IP_); |
|
if (status < 0) { |
|
if (status != -EAGAIN) |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
|
|
/* Notify the error cleanup path to drop the cluster lock. */ |
|
acquired = 1; |
|
|
|
/* We wait twice because a node may have died while we were in |
|
* the lower dlm layers. The second time though, we've |
|
* committed to owning this lock so we don't allow signals to |
|
* abort the operation. */ |
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
|
ocfs2_wait_for_recovery(osb); |
|
|
|
update: |
|
/* |
|
* We only see this flag if we're being called from |
|
* ocfs2_read_locked_inode(). It means we're locking an inode |
|
* which hasn't been populated yet, so clear the refresh flag |
|
* and let the caller handle it. |
|
*/ |
|
if (inode->i_state & I_NEW) { |
|
status = 0; |
|
if (lockres) |
|
ocfs2_complete_lock_res_refresh(lockres, 0); |
|
goto bail; |
|
} |
|
|
|
/* This is fun. The caller may want a bh back, or it may |
|
* not. ocfs2_inode_lock_update definitely wants one in, but |
|
* may or may not read one, depending on what's in the |
|
* LVB. The result of all of this is that we've *only* gone to |
|
* disk if we have to, so the complexity is worthwhile. */ |
|
status = ocfs2_inode_lock_update(inode, &local_bh); |
|
if (status < 0) { |
|
if (status != -ENOENT) |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
getbh: |
|
if (ret_bh) { |
|
status = ocfs2_assign_bh(inode, ret_bh, local_bh); |
|
if (status < 0) { |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
} |
|
|
|
bail: |
|
if (status < 0) { |
|
if (ret_bh && (*ret_bh)) { |
|
brelse(*ret_bh); |
|
*ret_bh = NULL; |
|
} |
|
if (acquired) |
|
ocfs2_inode_unlock(inode, ex); |
|
} |
|
|
|
brelse(local_bh); |
|
return status; |
|
} |
|
|
|
/* |
|
* This is working around a lock inversion between tasks acquiring DLM |
|
* locks while holding a page lock and the downconvert thread which |
|
* blocks dlm lock acquiry while acquiring page locks. |
|
* |
|
* ** These _with_page variantes are only intended to be called from aop |
|
* methods that hold page locks and return a very specific *positive* error |
|
* code that aop methods pass up to the VFS -- test for errors with != 0. ** |
|
* |
|
* The DLM is called such that it returns -EAGAIN if it would have |
|
* blocked waiting for the downconvert thread. In that case we unlock |
|
* our page so the downconvert thread can make progress. Once we've |
|
* done this we have to return AOP_TRUNCATED_PAGE so the aop method |
|
* that called us can bubble that back up into the VFS who will then |
|
* immediately retry the aop call. |
|
*/ |
|
int ocfs2_inode_lock_with_page(struct inode *inode, |
|
struct buffer_head **ret_bh, |
|
int ex, |
|
struct page *page) |
|
{ |
|
int ret; |
|
|
|
ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
|
if (ret == -EAGAIN) { |
|
unlock_page(page); |
|
/* |
|
* If we can't get inode lock immediately, we should not return |
|
* directly here, since this will lead to a softlockup problem. |
|
* The method is to get a blocking lock and immediately unlock |
|
* before returning, this can avoid CPU resource waste due to |
|
* lots of retries, and benefits fairness in getting lock. |
|
*/ |
|
if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) |
|
ocfs2_inode_unlock(inode, ex); |
|
ret = AOP_TRUNCATED_PAGE; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int ocfs2_inode_lock_atime(struct inode *inode, |
|
struct vfsmount *vfsmnt, |
|
int *level, int wait) |
|
{ |
|
int ret; |
|
|
|
if (wait) |
|
ret = ocfs2_inode_lock(inode, NULL, 0); |
|
else |
|
ret = ocfs2_try_inode_lock(inode, NULL, 0); |
|
|
|
if (ret < 0) { |
|
if (ret != -EAGAIN) |
|
mlog_errno(ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* If we should update atime, we will get EX lock, |
|
* otherwise we just get PR lock. |
|
*/ |
|
if (ocfs2_should_update_atime(inode, vfsmnt)) { |
|
struct buffer_head *bh = NULL; |
|
|
|
ocfs2_inode_unlock(inode, 0); |
|
if (wait) |
|
ret = ocfs2_inode_lock(inode, &bh, 1); |
|
else |
|
ret = ocfs2_try_inode_lock(inode, &bh, 1); |
|
|
|
if (ret < 0) { |
|
if (ret != -EAGAIN) |
|
mlog_errno(ret); |
|
return ret; |
|
} |
|
*level = 1; |
|
if (ocfs2_should_update_atime(inode, vfsmnt)) |
|
ocfs2_update_inode_atime(inode, bh); |
|
brelse(bh); |
|
} else |
|
*level = 0; |
|
|
|
return ret; |
|
} |
|
|
|
void ocfs2_inode_unlock(struct inode *inode, |
|
int ex) |
|
{ |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
|
|
|
mlog(0, "inode %llu drop %s META lock\n", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, |
|
ex ? "EXMODE" : "PRMODE"); |
|
|
|
if (!ocfs2_is_hard_readonly(osb) && |
|
!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
} |
|
|
|
/* |
|
* This _tracker variantes are introduced to deal with the recursive cluster |
|
* locking issue. The idea is to keep track of a lock holder on the stack of |
|
* the current process. If there's a lock holder on the stack, we know the |
|
* task context is already protected by cluster locking. Currently, they're |
|
* used in some VFS entry routines. |
|
* |
|
* return < 0 on error, return == 0 if there's no lock holder on the stack |
|
* before this call, return == 1 if this call would be a recursive locking. |
|
* return == -1 if this lock attempt will cause an upgrade which is forbidden. |
|
* |
|
* When taking lock levels into account,we face some different situations. |
|
* |
|
* 1. no lock is held |
|
* In this case, just lock the inode as requested and return 0 |
|
* |
|
* 2. We are holding a lock |
|
* For this situation, things diverges into several cases |
|
* |
|
* wanted holding what to do |
|
* ex ex see 2.1 below |
|
* ex pr see 2.2 below |
|
* pr ex see 2.1 below |
|
* pr pr see 2.1 below |
|
* |
|
* 2.1 lock level that is been held is compatible |
|
* with the wanted level, so no lock action will be tacken. |
|
* |
|
* 2.2 Otherwise, an upgrade is needed, but it is forbidden. |
|
* |
|
* Reason why upgrade within a process is forbidden is that |
|
* lock upgrade may cause dead lock. The following illustrates |
|
* how it happens. |
|
* |
|
* thread on node1 thread on node2 |
|
* ocfs2_inode_lock_tracker(ex=0) |
|
* |
|
* <====== ocfs2_inode_lock_tracker(ex=1) |
|
* |
|
* ocfs2_inode_lock_tracker(ex=1) |
|
*/ |
|
int ocfs2_inode_lock_tracker(struct inode *inode, |
|
struct buffer_head **ret_bh, |
|
int ex, |
|
struct ocfs2_lock_holder *oh) |
|
{ |
|
int status = 0; |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_lock_holder *tmp_oh; |
|
struct pid *pid = task_pid(current); |
|
|
|
|
|
lockres = &OCFS2_I(inode)->ip_inode_lockres; |
|
tmp_oh = ocfs2_pid_holder(lockres, pid); |
|
|
|
if (!tmp_oh) { |
|
/* |
|
* This corresponds to the case 1. |
|
* We haven't got any lock before. |
|
*/ |
|
status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0); |
|
if (status < 0) { |
|
if (status != -ENOENT) |
|
mlog_errno(status); |
|
return status; |
|
} |
|
|
|
oh->oh_ex = ex; |
|
ocfs2_add_holder(lockres, oh); |
|
return 0; |
|
} |
|
|
|
if (unlikely(ex && !tmp_oh->oh_ex)) { |
|
/* |
|
* case 2.2 upgrade may cause dead lock, forbid it. |
|
*/ |
|
mlog(ML_ERROR, "Recursive locking is not permitted to " |
|
"upgrade to EX level from PR level.\n"); |
|
dump_stack(); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full. |
|
* ignore the lock level and just update it. |
|
*/ |
|
if (ret_bh) { |
|
status = ocfs2_inode_lock_full(inode, ret_bh, ex, |
|
OCFS2_META_LOCK_GETBH); |
|
if (status < 0) { |
|
if (status != -ENOENT) |
|
mlog_errno(status); |
|
return status; |
|
} |
|
} |
|
return tmp_oh ? 1 : 0; |
|
} |
|
|
|
void ocfs2_inode_unlock_tracker(struct inode *inode, |
|
int ex, |
|
struct ocfs2_lock_holder *oh, |
|
int had_lock) |
|
{ |
|
struct ocfs2_lock_res *lockres; |
|
|
|
lockres = &OCFS2_I(inode)->ip_inode_lockres; |
|
/* had_lock means that the currect process already takes the cluster |
|
* lock previously. |
|
* If had_lock is 1, we have nothing to do here. |
|
* If had_lock is 0, we will release the lock. |
|
*/ |
|
if (!had_lock) { |
|
ocfs2_inode_unlock(inode, oh->oh_ex); |
|
ocfs2_remove_holder(lockres, oh); |
|
} |
|
} |
|
|
|
int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
|
{ |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_orphan_scan_lvb *lvb; |
|
int status = 0; |
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
lockres = &osb->osb_orphan_scan.os_lockres; |
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
|
if (status < 0) |
|
return status; |
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
|
lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) |
|
*seqno = be32_to_cpu(lvb->lvb_os_seqno); |
|
else |
|
*seqno = osb->osb_orphan_scan.os_seqno + 1; |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
|
{ |
|
struct ocfs2_lock_res *lockres; |
|
struct ocfs2_orphan_scan_lvb *lvb; |
|
|
|
if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
|
lockres = &osb->osb_orphan_scan.os_lockres; |
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; |
|
lvb->lvb_os_seqno = cpu_to_be32(seqno); |
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
|
} |
|
} |
|
|
|
int ocfs2_super_lock(struct ocfs2_super *osb, |
|
int ex) |
|
{ |
|
int status = 0; |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
goto bail; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
|
if (status < 0) { |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
|
|
/* The super block lock path is really in the best position to |
|
* know when resources covered by the lock need to be |
|
* refreshed, so we do it here. Of course, making sense of |
|
* everything is up to the caller :) */ |
|
status = ocfs2_should_refresh_lock_res(lockres); |
|
if (status) { |
|
status = ocfs2_refresh_slot_info(osb); |
|
|
|
ocfs2_complete_lock_res_refresh(lockres, status); |
|
|
|
if (status < 0) { |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
mlog_errno(status); |
|
} |
|
ocfs2_track_lock_refresh(lockres); |
|
} |
|
bail: |
|
return status; |
|
} |
|
|
|
void ocfs2_super_unlock(struct ocfs2_super *osb, |
|
int ex) |
|
{ |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
|
|
|
if (!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
} |
|
|
|
int ocfs2_rename_lock(struct ocfs2_super *osb) |
|
{ |
|
int status; |
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_rename_unlock(struct ocfs2_super *osb) |
|
{ |
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
|
|
|
if (!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
|
} |
|
|
|
int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
|
{ |
|
int status; |
|
struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; |
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ex) |
|
down_write(&osb->nfs_sync_rwlock); |
|
else |
|
down_read(&osb->nfs_sync_rwlock); |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, |
|
0, 0); |
|
if (status < 0) { |
|
mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); |
|
|
|
if (ex) |
|
up_write(&osb->nfs_sync_rwlock); |
|
else |
|
up_read(&osb->nfs_sync_rwlock); |
|
} |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) |
|
{ |
|
struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; |
|
|
|
if (!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, |
|
ex ? LKM_EXMODE : LKM_PRMODE); |
|
if (ex) |
|
up_write(&osb->nfs_sync_rwlock); |
|
else |
|
up_read(&osb->nfs_sync_rwlock); |
|
} |
|
|
|
int ocfs2_trim_fs_lock(struct ocfs2_super *osb, |
|
struct ocfs2_trim_fs_info *info, int trylock) |
|
{ |
|
int status; |
|
struct ocfs2_trim_fs_lvb *lvb; |
|
struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; |
|
|
|
if (info) |
|
info->tf_valid = 0; |
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, |
|
trylock ? DLM_LKF_NOQUEUE : 0, 0); |
|
if (status < 0) { |
|
if (status != -EAGAIN) |
|
mlog_errno(status); |
|
return status; |
|
} |
|
|
|
if (info) { |
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
|
lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) { |
|
info->tf_valid = 1; |
|
info->tf_success = lvb->lvb_success; |
|
info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum); |
|
info->tf_start = be64_to_cpu(lvb->lvb_start); |
|
info->tf_len = be64_to_cpu(lvb->lvb_len); |
|
info->tf_minlen = be64_to_cpu(lvb->lvb_minlen); |
|
info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen); |
|
} |
|
} |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_trim_fs_unlock(struct ocfs2_super *osb, |
|
struct ocfs2_trim_fs_info *info) |
|
{ |
|
struct ocfs2_trim_fs_lvb *lvb; |
|
struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return; |
|
|
|
if (info) { |
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION; |
|
lvb->lvb_success = info->tf_success; |
|
lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum); |
|
lvb->lvb_start = cpu_to_be64(info->tf_start); |
|
lvb->lvb_len = cpu_to_be64(info->tf_len); |
|
lvb->lvb_minlen = cpu_to_be64(info->tf_minlen); |
|
lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen); |
|
} |
|
|
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
|
} |
|
|
|
int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
|
{ |
|
int ret; |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
|
|
|
BUG_ON(!dl); |
|
|
|
if (ocfs2_is_hard_readonly(osb)) { |
|
if (ex) |
|
return -EROFS; |
|
return 0; |
|
} |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
|
if (ret < 0) |
|
mlog_errno(ret); |
|
|
|
return ret; |
|
} |
|
|
|
void ocfs2_dentry_unlock(struct dentry *dentry, int ex) |
|
{ |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
|
|
|
if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
|
} |
|
|
|
/* Reference counting of the dlm debug structure. We want this because |
|
* open references on the debug inodes can live on after a mount, so |
|
* we can't rely on the ocfs2_super to always exist. */ |
|
static void ocfs2_dlm_debug_free(struct kref *kref) |
|
{ |
|
struct ocfs2_dlm_debug *dlm_debug; |
|
|
|
dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); |
|
|
|
kfree(dlm_debug); |
|
} |
|
|
|
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) |
|
{ |
|
if (dlm_debug) |
|
kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); |
|
} |
|
|
|
static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) |
|
{ |
|
kref_get(&debug->d_refcnt); |
|
} |
|
|
|
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) |
|
{ |
|
struct ocfs2_dlm_debug *dlm_debug; |
|
|
|
dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); |
|
if (!dlm_debug) { |
|
mlog_errno(-ENOMEM); |
|
goto out; |
|
} |
|
|
|
kref_init(&dlm_debug->d_refcnt); |
|
INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); |
|
dlm_debug->d_filter_secs = 0; |
|
out: |
|
return dlm_debug; |
|
} |
|
|
|
/* Access to this is arbitrated for us via seq_file->sem. */ |
|
struct ocfs2_dlm_seq_priv { |
|
struct ocfs2_dlm_debug *p_dlm_debug; |
|
struct ocfs2_lock_res p_iter_res; |
|
struct ocfs2_lock_res p_tmp_res; |
|
}; |
|
|
|
static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, |
|
struct ocfs2_dlm_seq_priv *priv) |
|
{ |
|
struct ocfs2_lock_res *iter, *ret = NULL; |
|
struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; |
|
|
|
assert_spin_locked(&ocfs2_dlm_tracking_lock); |
|
|
|
list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { |
|
/* discover the head of the list */ |
|
if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { |
|
mlog(0, "End of list found, %p\n", ret); |
|
break; |
|
} |
|
|
|
/* We track our "dummy" iteration lockres' by a NULL |
|
* l_ops field. */ |
|
if (iter->l_ops != NULL) { |
|
ret = iter; |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) |
|
{ |
|
struct ocfs2_dlm_seq_priv *priv = m->private; |
|
struct ocfs2_lock_res *iter; |
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock); |
|
iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); |
|
if (iter) { |
|
/* Since lockres' have the lifetime of their container |
|
* (which can be inodes, ocfs2_supers, etc) we want to |
|
* copy this out to a temporary lockres while still |
|
* under the spinlock. Obviously after this we can't |
|
* trust any pointers on the copy returned, but that's |
|
* ok as the information we want isn't typically held |
|
* in them. */ |
|
priv->p_tmp_res = *iter; |
|
iter = &priv->p_tmp_res; |
|
} |
|
spin_unlock(&ocfs2_dlm_tracking_lock); |
|
|
|
return iter; |
|
} |
|
|
|
static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) |
|
{ |
|
} |
|
|
|
static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) |
|
{ |
|
struct ocfs2_dlm_seq_priv *priv = m->private; |
|
struct ocfs2_lock_res *iter = v; |
|
struct ocfs2_lock_res *dummy = &priv->p_iter_res; |
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock); |
|
iter = ocfs2_dlm_next_res(iter, priv); |
|
list_del_init(&dummy->l_debug_list); |
|
if (iter) { |
|
list_add(&dummy->l_debug_list, &iter->l_debug_list); |
|
priv->p_tmp_res = *iter; |
|
iter = &priv->p_tmp_res; |
|
} |
|
spin_unlock(&ocfs2_dlm_tracking_lock); |
|
|
|
return iter; |
|
} |
|
|
|
/* |
|
* Version is used by debugfs.ocfs2 to determine the format being used |
|
* |
|
* New in version 2 |
|
* - Lock stats printed |
|
* New in version 3 |
|
* - Max time in lock stats is in usecs (instead of nsecs) |
|
* New in version 4 |
|
* - Add last pr/ex unlock times and first lock wait time in usecs |
|
*/ |
|
#define OCFS2_DLM_DEBUG_STR_VERSION 4 |
|
static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
|
{ |
|
int i; |
|
char *lvb; |
|
struct ocfs2_lock_res *lockres = v; |
|
#ifdef CONFIG_OCFS2_FS_STATS |
|
u64 now, last; |
|
struct ocfs2_dlm_debug *dlm_debug = |
|
((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug; |
|
#endif |
|
|
|
if (!lockres) |
|
return -EINVAL; |
|
|
|
#ifdef CONFIG_OCFS2_FS_STATS |
|
if (!lockres->l_lock_wait && dlm_debug->d_filter_secs) { |
|
now = ktime_to_us(ktime_get_real()); |
|
if (lockres->l_lock_prmode.ls_last > |
|
lockres->l_lock_exmode.ls_last) |
|
last = lockres->l_lock_prmode.ls_last; |
|
else |
|
last = lockres->l_lock_exmode.ls_last; |
|
/* |
|
* Use d_filter_secs field to filter lock resources dump, |
|
* the default d_filter_secs(0) value filters nothing, |
|
* otherwise, only dump the last N seconds active lock |
|
* resources. |
|
*/ |
|
if (div_u64(now - last, 1000000) > dlm_debug->d_filter_secs) |
|
return 0; |
|
} |
|
#endif |
|
|
|
seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
|
|
|
if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) |
|
seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, |
|
lockres->l_name, |
|
(unsigned int)ocfs2_get_dentry_lock_ino(lockres)); |
|
else |
|
seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); |
|
|
|
seq_printf(m, "%d\t" |
|
"0x%lx\t" |
|
"0x%x\t" |
|
"0x%x\t" |
|
"%u\t" |
|
"%u\t" |
|
"%d\t" |
|
"%d\t", |
|
lockres->l_level, |
|
lockres->l_flags, |
|
lockres->l_action, |
|
lockres->l_unlock_action, |
|
lockres->l_ro_holders, |
|
lockres->l_ex_holders, |
|
lockres->l_requested, |
|
lockres->l_blocking); |
|
|
|
/* Dump the raw LVB */ |
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
for(i = 0; i < DLM_LVB_LEN; i++) |
|
seq_printf(m, "0x%x\t", lvb[i]); |
|
|
|
#ifdef CONFIG_OCFS2_FS_STATS |
|
# define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
|
# define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) |
|
# define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) |
|
# define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) |
|
# define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) |
|
# define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) |
|
# define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) |
|
# define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) |
|
# define lock_refresh(_l) ((_l)->l_lock_refresh) |
|
# define lock_last_prmode(_l) ((_l)->l_lock_prmode.ls_last) |
|
# define lock_last_exmode(_l) ((_l)->l_lock_exmode.ls_last) |
|
# define lock_wait(_l) ((_l)->l_lock_wait) |
|
#else |
|
# define lock_num_prmode(_l) (0) |
|
# define lock_num_exmode(_l) (0) |
|
# define lock_num_prmode_failed(_l) (0) |
|
# define lock_num_exmode_failed(_l) (0) |
|
# define lock_total_prmode(_l) (0ULL) |
|
# define lock_total_exmode(_l) (0ULL) |
|
# define lock_max_prmode(_l) (0) |
|
# define lock_max_exmode(_l) (0) |
|
# define lock_refresh(_l) (0) |
|
# define lock_last_prmode(_l) (0ULL) |
|
# define lock_last_exmode(_l) (0ULL) |
|
# define lock_wait(_l) (0ULL) |
|
#endif |
|
/* The following seq_print was added in version 2 of this output */ |
|
seq_printf(m, "%u\t" |
|
"%u\t" |
|
"%u\t" |
|
"%u\t" |
|
"%llu\t" |
|
"%llu\t" |
|
"%u\t" |
|
"%u\t" |
|
"%u\t" |
|
"%llu\t" |
|
"%llu\t" |
|
"%llu\t", |
|
lock_num_prmode(lockres), |
|
lock_num_exmode(lockres), |
|
lock_num_prmode_failed(lockres), |
|
lock_num_exmode_failed(lockres), |
|
lock_total_prmode(lockres), |
|
lock_total_exmode(lockres), |
|
lock_max_prmode(lockres), |
|
lock_max_exmode(lockres), |
|
lock_refresh(lockres), |
|
lock_last_prmode(lockres), |
|
lock_last_exmode(lockres), |
|
lock_wait(lockres)); |
|
|
|
/* End the line */ |
|
seq_printf(m, "\n"); |
|
return 0; |
|
} |
|
|
|
static const struct seq_operations ocfs2_dlm_seq_ops = { |
|
.start = ocfs2_dlm_seq_start, |
|
.stop = ocfs2_dlm_seq_stop, |
|
.next = ocfs2_dlm_seq_next, |
|
.show = ocfs2_dlm_seq_show, |
|
}; |
|
|
|
static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) |
|
{ |
|
struct seq_file *seq = file->private_data; |
|
struct ocfs2_dlm_seq_priv *priv = seq->private; |
|
struct ocfs2_lock_res *res = &priv->p_iter_res; |
|
|
|
ocfs2_remove_lockres_tracking(res); |
|
ocfs2_put_dlm_debug(priv->p_dlm_debug); |
|
return seq_release_private(inode, file); |
|
} |
|
|
|
static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) |
|
{ |
|
struct ocfs2_dlm_seq_priv *priv; |
|
struct ocfs2_super *osb; |
|
|
|
priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
|
if (!priv) { |
|
mlog_errno(-ENOMEM); |
|
return -ENOMEM; |
|
} |
|
|
|
osb = inode->i_private; |
|
ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
|
priv->p_dlm_debug = osb->osb_dlm_debug; |
|
INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); |
|
|
|
ocfs2_add_lockres_tracking(&priv->p_iter_res, |
|
priv->p_dlm_debug); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct file_operations ocfs2_dlm_debug_fops = { |
|
.open = ocfs2_dlm_debug_open, |
|
.release = ocfs2_dlm_debug_release, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
}; |
|
|
|
static void ocfs2_dlm_init_debug(struct ocfs2_super *osb) |
|
{ |
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
|
|
|
debugfs_create_file("locking_state", S_IFREG|S_IRUSR, |
|
osb->osb_debug_root, osb, &ocfs2_dlm_debug_fops); |
|
|
|
debugfs_create_u32("locking_filter", 0600, osb->osb_debug_root, |
|
&dlm_debug->d_filter_secs); |
|
ocfs2_get_dlm_debug(dlm_debug); |
|
} |
|
|
|
static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) |
|
{ |
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
|
|
|
if (dlm_debug) |
|
ocfs2_put_dlm_debug(dlm_debug); |
|
} |
|
|
|
int ocfs2_dlm_init(struct ocfs2_super *osb) |
|
{ |
|
int status = 0; |
|
struct ocfs2_cluster_connection *conn = NULL; |
|
|
|
if (ocfs2_mount_local(osb)) { |
|
osb->node_num = 0; |
|
goto local; |
|
} |
|
|
|
ocfs2_dlm_init_debug(osb); |
|
|
|
/* launch downconvert thread */ |
|
osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
|
osb->uuid_str); |
|
if (IS_ERR(osb->dc_task)) { |
|
status = PTR_ERR(osb->dc_task); |
|
osb->dc_task = NULL; |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
|
|
/* for now, uuid == domain */ |
|
status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
|
osb->osb_cluster_name, |
|
strlen(osb->osb_cluster_name), |
|
osb->uuid_str, |
|
strlen(osb->uuid_str), |
|
&lproto, ocfs2_do_node_down, osb, |
|
&conn); |
|
if (status) { |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
|
|
status = ocfs2_cluster_this_node(conn, &osb->node_num); |
|
if (status < 0) { |
|
mlog_errno(status); |
|
mlog(ML_ERROR, |
|
"could not find this host's node number\n"); |
|
ocfs2_cluster_disconnect(conn, 0); |
|
goto bail; |
|
} |
|
|
|
local: |
|
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
|
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); |
|
ocfs2_nfs_sync_lock_init(osb); |
|
ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
|
|
|
osb->cconn = conn; |
|
bail: |
|
if (status < 0) { |
|
ocfs2_dlm_shutdown_debug(osb); |
|
if (osb->dc_task) |
|
kthread_stop(osb->dc_task); |
|
} |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
|
int hangup_pending) |
|
{ |
|
ocfs2_drop_osb_locks(osb); |
|
|
|
/* |
|
* Now that we have dropped all locks and ocfs2_dismount_volume() |
|
* has disabled recovery, the DLM won't be talking to us. It's |
|
* safe to tear things down before disconnecting the cluster. |
|
*/ |
|
|
|
if (osb->dc_task) { |
|
kthread_stop(osb->dc_task); |
|
osb->dc_task = NULL; |
|
} |
|
|
|
ocfs2_lock_res_free(&osb->osb_super_lockres); |
|
ocfs2_lock_res_free(&osb->osb_rename_lockres); |
|
ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
|
ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
|
|
|
ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
|
osb->cconn = NULL; |
|
|
|
ocfs2_dlm_shutdown_debug(osb); |
|
} |
|
|
|
static int ocfs2_drop_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int ret; |
|
unsigned long flags; |
|
u32 lkm_flags = 0; |
|
|
|
/* We didn't get anywhere near actually using this lockres. */ |
|
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) |
|
goto out; |
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
|
lkm_flags |= DLM_LKF_VALBLK; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), |
|
"lockres %s, flags 0x%lx\n", |
|
lockres->l_name, lockres->l_flags); |
|
|
|
while (lockres->l_flags & OCFS2_LOCK_BUSY) { |
|
mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " |
|
"%u, unlock_action = %u\n", |
|
lockres->l_name, lockres->l_flags, lockres->l_action, |
|
lockres->l_unlock_action); |
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
/* XXX: Today we just wait on any busy |
|
* locks... Perhaps we need to cancel converts in the |
|
* future? */ |
|
ocfs2_wait_on_busy_lock(lockres); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
} |
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
|
if (lockres->l_flags & OCFS2_LOCK_ATTACHED && |
|
lockres->l_level == DLM_LOCK_EX && |
|
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
|
lockres->l_ops->set_lvb(lockres); |
|
} |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) |
|
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", |
|
lockres->l_name); |
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) |
|
mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); |
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
goto out; |
|
} |
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); |
|
|
|
/* make sure we never get here while waiting for an ast to |
|
* fire. */ |
|
BUG_ON(lockres->l_action != OCFS2_AST_INVALID); |
|
|
|
/* is this necessary? */ |
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
|
lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
mlog(0, "lock %s\n", lockres->l_name); |
|
|
|
ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
|
if (ret) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); |
|
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
|
ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
|
BUG(); |
|
} |
|
mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
|
lockres->l_name); |
|
|
|
ocfs2_wait_on_busy_lock(lockres); |
|
out: |
|
return 0; |
|
} |
|
|
|
static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres); |
|
|
|
/* Mark the lockres as being dropped. It will no longer be |
|
* queued if blocking, but we still may have to wait on it |
|
* being dequeued from the downconvert thread before we can consider |
|
* it safe to drop. |
|
* |
|
* You can *not* attempt to call cluster_lock on this lockres anymore. */ |
|
void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int status; |
|
struct ocfs2_mask_waiter mw; |
|
unsigned long flags, flags2; |
|
|
|
ocfs2_init_mask_waiter(&mw); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
lockres->l_flags |= OCFS2_LOCK_FREEING; |
|
if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
|
/* |
|
* We know the downconvert is queued but not in progress |
|
* because we are the downconvert thread and processing |
|
* different lock. So we can just remove the lock from the |
|
* queue. This is not only an optimization but also a way |
|
* to avoid the following deadlock: |
|
* ocfs2_dentry_post_unlock() |
|
* ocfs2_dentry_lock_put() |
|
* ocfs2_drop_dentry_lock() |
|
* iput() |
|
* ocfs2_evict_inode() |
|
* ocfs2_clear_inode() |
|
* ocfs2_mark_lockres_freeing() |
|
* ... blocks waiting for OCFS2_LOCK_QUEUED |
|
* since we are the downconvert thread which |
|
* should clear the flag. |
|
*/ |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
spin_lock_irqsave(&osb->dc_task_lock, flags2); |
|
list_del_init(&lockres->l_blocked_list); |
|
osb->blocked_lock_count--; |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags2); |
|
/* |
|
* Warn if we recurse into another post_unlock call. Strictly |
|
* speaking it isn't a problem but we need to be careful if |
|
* that happens (stack overflow, deadlocks, ...) so warn if |
|
* ocfs2 grows a path for which this can happen. |
|
*/ |
|
WARN_ON_ONCE(lockres->l_ops->post_unlock); |
|
/* Since the lock is freeing we don't do much in the fn below */ |
|
ocfs2_process_blocked_lock(osb, lockres); |
|
return; |
|
} |
|
while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
mlog(0, "Waiting on lockres %s\n", lockres->l_name); |
|
|
|
status = ocfs2_wait_for_mask(&mw); |
|
if (status) |
|
mlog_errno(status); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
} |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
} |
|
|
|
void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int ret; |
|
|
|
ocfs2_mark_lockres_freeing(osb, lockres); |
|
ret = ocfs2_drop_lock(osb, lockres); |
|
if (ret) |
|
mlog_errno(ret); |
|
} |
|
|
|
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
|
{ |
|
ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); |
|
ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); |
|
ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
|
ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
|
} |
|
|
|
int ocfs2_drop_inode_locks(struct inode *inode) |
|
{ |
|
int status, err; |
|
|
|
/* No need to call ocfs2_mark_lockres_freeing here - |
|
* ocfs2_clear_inode has done it for us. */ |
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
|
&OCFS2_I(inode)->ip_open_lockres); |
|
if (err < 0) |
|
mlog_errno(err); |
|
|
|
status = err; |
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
|
&OCFS2_I(inode)->ip_inode_lockres); |
|
if (err < 0) |
|
mlog_errno(err); |
|
if (err < 0 && !status) |
|
status = err; |
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
|
&OCFS2_I(inode)->ip_rw_lockres); |
|
if (err < 0) |
|
mlog_errno(err); |
|
if (err < 0 && !status) |
|
status = err; |
|
|
|
return status; |
|
} |
|
|
|
static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
|
int new_level) |
|
{ |
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
|
|
|
if (lockres->l_level <= new_level) { |
|
mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
|
"type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " |
|
"block %d, pgen %d\n", lockres->l_name, lockres->l_level, |
|
new_level, list_empty(&lockres->l_blocked_list), |
|
list_empty(&lockres->l_mask_waiters), lockres->l_type, |
|
lockres->l_flags, lockres->l_ro_holders, |
|
lockres->l_ex_holders, lockres->l_action, |
|
lockres->l_unlock_action, lockres->l_requested, |
|
lockres->l_blocking, lockres->l_pending_gen); |
|
BUG(); |
|
} |
|
|
|
mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
|
lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); |
|
|
|
lockres->l_action = OCFS2_AST_DOWNCONVERT; |
|
lockres->l_requested = new_level; |
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
|
return lockres_set_pending(lockres); |
|
} |
|
|
|
static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
int new_level, |
|
int lvb, |
|
unsigned int generation) |
|
{ |
|
int ret; |
|
u32 dlm_flags = DLM_LKF_CONVERT; |
|
|
|
mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
|
lockres->l_level, new_level); |
|
|
|
/* |
|
* On DLM_LKF_VALBLK, fsdlm behaves differently with o2cb. It always |
|
* expects DLM_LKF_VALBLK being set if the LKB has LVB, so that |
|
* we can recover correctly from node failure. Otherwise, we may get |
|
* invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set. |
|
*/ |
|
if (ocfs2_userspace_stack(osb) && |
|
lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
|
lvb = 1; |
|
|
|
if (lvb) |
|
dlm_flags |= DLM_LKF_VALBLK; |
|
|
|
ret = ocfs2_dlm_lock(osb->cconn, |
|
new_level, |
|
&lockres->l_lksb, |
|
dlm_flags, |
|
lockres->l_name, |
|
OCFS2_LOCK_ID_MAX_LEN - 1); |
|
lockres_clear_pending(lockres, generation, osb); |
|
if (ret) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
|
ocfs2_recover_from_dlm_error(lockres, 1); |
|
goto bail; |
|
} |
|
|
|
ret = 0; |
|
bail: |
|
return ret; |
|
} |
|
|
|
/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
|
static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
|
/* If we're already trying to cancel a lock conversion |
|
* then just drop the spinlock and allow the caller to |
|
* requeue this lock. */ |
|
mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
|
return 0; |
|
} |
|
|
|
/* were we in a convert when we got the bast fire? */ |
|
BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && |
|
lockres->l_action != OCFS2_AST_DOWNCONVERT); |
|
/* set things up for the unlockast to know to just |
|
* clear out the ast_action and unset busy, etc. */ |
|
lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; |
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), |
|
"lock %s, invalid flags: 0x%lx\n", |
|
lockres->l_name, lockres->l_flags); |
|
|
|
mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
|
|
|
return 1; |
|
} |
|
|
|
static int ocfs2_cancel_convert(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int ret; |
|
|
|
ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
|
DLM_LKF_CANCEL); |
|
if (ret) { |
|
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); |
|
ocfs2_recover_from_dlm_error(lockres, 0); |
|
} |
|
|
|
mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
|
|
|
return ret; |
|
} |
|
|
|
static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres, |
|
struct ocfs2_unblock_ctl *ctl) |
|
{ |
|
unsigned long flags; |
|
int blocking; |
|
int new_level; |
|
int level; |
|
int ret = 0; |
|
int set_lvb = 0; |
|
unsigned int gen; |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
|
|
recheck: |
|
/* |
|
* Is it still blocking? If not, we have no more work to do. |
|
*/ |
|
if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { |
|
BUG_ON(lockres->l_blocking != DLM_LOCK_NL); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
ret = 0; |
|
goto leave; |
|
} |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
|
/* XXX |
|
* This is a *big* race. The OCFS2_LOCK_PENDING flag |
|
* exists entirely for one reason - another thread has set |
|
* OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). |
|
* |
|
* If we do ocfs2_cancel_convert() before the other thread |
|
* calls dlm_lock(), our cancel will do nothing. We will |
|
* get no ast, and we will have no way of knowing the |
|
* cancel failed. Meanwhile, the other thread will call |
|
* into dlm_lock() and wait...forever. |
|
* |
|
* Why forever? Because another node has asked for the |
|
* lock first; that's why we're here in unblock_lock(). |
|
* |
|
* The solution is OCFS2_LOCK_PENDING. When PENDING is |
|
* set, we just requeue the unblock. Only when the other |
|
* thread has called dlm_lock() and cleared PENDING will |
|
* we then cancel their request. |
|
* |
|
* All callers of dlm_lock() must set OCFS2_DLM_PENDING |
|
* at the same time they set OCFS2_DLM_BUSY. They must |
|
* clear OCFS2_DLM_PENDING after dlm_lock() returns. |
|
*/ |
|
if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
|
mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", |
|
lockres->l_name); |
|
goto leave_requeue; |
|
} |
|
|
|
ctl->requeue = 1; |
|
ret = ocfs2_prepare_cancel_convert(osb, lockres); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
if (ret) { |
|
ret = ocfs2_cancel_convert(osb, lockres); |
|
if (ret < 0) |
|
mlog_errno(ret); |
|
} |
|
goto leave; |
|
} |
|
|
|
/* |
|
* This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is |
|
* set when the ast is received for an upconvert just before the |
|
* OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast |
|
* on the heels of the ast, we want to delay the downconvert just |
|
* enough to allow the up requestor to do its task. Because this |
|
* lock is in the blocked queue, the lock will be downconverted |
|
* as soon as the requestor is done with the lock. |
|
*/ |
|
if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) |
|
goto leave_requeue; |
|
|
|
/* |
|
* How can we block and yet be at NL? We were trying to upconvert |
|
* from NL and got canceled. The code comes back here, and now |
|
* we notice and clear BLOCKING. |
|
*/ |
|
if (lockres->l_level == DLM_LOCK_NL) { |
|
BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); |
|
mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
|
lockres->l_blocking = DLM_LOCK_NL; |
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
goto leave; |
|
} |
|
|
|
/* if we're blocking an exclusive and we have *any* holders, |
|
* then requeue. */ |
|
if ((lockres->l_blocking == DLM_LOCK_EX) |
|
&& (lockres->l_ex_holders || lockres->l_ro_holders)) { |
|
mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", |
|
lockres->l_name, lockres->l_ex_holders, |
|
lockres->l_ro_holders); |
|
goto leave_requeue; |
|
} |
|
|
|
/* If it's a PR we're blocking, then only |
|
* requeue if we've got any EX holders */ |
|
if (lockres->l_blocking == DLM_LOCK_PR && |
|
lockres->l_ex_holders) { |
|
mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", |
|
lockres->l_name, lockres->l_ex_holders); |
|
goto leave_requeue; |
|
} |
|
|
|
/* |
|
* Can we get a lock in this state if the holder counts are |
|
* zero? The meta data unblock code used to check this. |
|
*/ |
|
if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
|
&& (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
|
mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", |
|
lockres->l_name); |
|
goto leave_requeue; |
|
} |
|
|
|
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
|
|
|
if (lockres->l_ops->check_downconvert |
|
&& !lockres->l_ops->check_downconvert(lockres, new_level)) { |
|
mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", |
|
lockres->l_name); |
|
goto leave_requeue; |
|
} |
|
|
|
/* If we get here, then we know that there are no more |
|
* incompatible holders (and anyone asking for an incompatible |
|
* lock is blocked). We can now downconvert the lock */ |
|
if (!lockres->l_ops->downconvert_worker) |
|
goto downconvert; |
|
|
|
/* Some lockres types want to do a bit of work before |
|
* downconverting a lock. Allow that here. The worker function |
|
* may sleep, so we save off a copy of what we're blocking as |
|
* it may change while we're not holding the spin lock. */ |
|
blocking = lockres->l_blocking; |
|
level = lockres->l_level; |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
|
|
|
if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
|
mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", |
|
lockres->l_name); |
|
goto leave; |
|
} |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
|
/* If this changed underneath us, then we can't drop |
|
* it just yet. */ |
|
mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
|
"Recheck\n", lockres->l_name, blocking, |
|
lockres->l_blocking, level, lockres->l_level); |
|
goto recheck; |
|
} |
|
|
|
downconvert: |
|
ctl->requeue = 0; |
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
|
if (lockres->l_level == DLM_LOCK_EX) |
|
set_lvb = 1; |
|
|
|
/* |
|
* We only set the lvb if the lock has been fully |
|
* refreshed - otherwise we risk setting stale |
|
* data. Otherwise, there's no need to actually clear |
|
* out the lvb here as it's value is still valid. |
|
*/ |
|
if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
|
lockres->l_ops->set_lvb(lockres); |
|
} |
|
|
|
gen = ocfs2_prepare_downconvert(lockres, new_level); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
|
gen); |
|
|
|
leave: |
|
if (ret) |
|
mlog_errno(ret); |
|
return ret; |
|
|
|
leave_requeue: |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
ctl->requeue = 1; |
|
|
|
return 0; |
|
} |
|
|
|
static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
|
int blocking) |
|
{ |
|
struct inode *inode; |
|
struct address_space *mapping; |
|
struct ocfs2_inode_info *oi; |
|
|
|
inode = ocfs2_lock_res_inode(lockres); |
|
mapping = inode->i_mapping; |
|
|
|
if (S_ISDIR(inode->i_mode)) { |
|
oi = OCFS2_I(inode); |
|
oi->ip_dir_lock_gen++; |
|
mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); |
|
goto out; |
|
} |
|
|
|
if (!S_ISREG(inode->i_mode)) |
|
goto out; |
|
|
|
/* |
|
* We need this before the filemap_fdatawrite() so that it can |
|
* transfer the dirty bit from the PTE to the |
|
* page. Unfortunately this means that even for EX->PR |
|
* downconverts, we'll lose our mappings and have to build |
|
* them up again. |
|
*/ |
|
unmap_mapping_range(mapping, 0, 0, 0); |
|
|
|
if (filemap_fdatawrite(mapping)) { |
|
mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
|
(unsigned long long)OCFS2_I(inode)->ip_blkno); |
|
} |
|
sync_mapping_buffers(mapping); |
|
if (blocking == DLM_LOCK_EX) { |
|
truncate_inode_pages(mapping, 0); |
|
} else { |
|
/* We only need to wait on the I/O if we're not also |
|
* truncating pages because truncate_inode_pages waits |
|
* for us above. We don't truncate pages if we're |
|
* blocking anything < EXMODE because we want to keep |
|
* them around in that case. */ |
|
filemap_fdatawait(mapping); |
|
} |
|
|
|
forget_all_cached_acls(inode); |
|
|
|
out: |
|
return UNBLOCK_CONTINUE; |
|
} |
|
|
|
static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
|
struct ocfs2_lock_res *lockres, |
|
int new_level) |
|
{ |
|
int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
|
|
|
BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
|
BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); |
|
|
|
if (checkpointed) |
|
return 1; |
|
|
|
ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
|
return 0; |
|
} |
|
|
|
static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
|
int new_level) |
|
{ |
|
struct inode *inode = ocfs2_lock_res_inode(lockres); |
|
|
|
return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); |
|
} |
|
|
|
static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct inode *inode = ocfs2_lock_res_inode(lockres); |
|
|
|
__ocfs2_stuff_meta_lvb(inode); |
|
} |
|
|
|
/* |
|
* Does the final reference drop on our dentry lock. Right now this |
|
* happens in the downconvert thread, but we could choose to simplify the |
|
* dlmglue API and push these off to the ocfs2_wq in the future. |
|
*/ |
|
static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); |
|
ocfs2_dentry_lock_put(osb, dl); |
|
} |
|
|
|
/* |
|
* d_delete() matching dentries before the lock downconvert. |
|
* |
|
* At this point, any process waiting to destroy the |
|
* dentry_lock due to last ref count is stopped by the |
|
* OCFS2_LOCK_QUEUED flag. |
|
* |
|
* We have two potential problems |
|
* |
|
* 1) If we do the last reference drop on our dentry_lock (via dput) |
|
* we'll wind up in ocfs2_release_dentry_lock(), waiting on |
|
* the downconvert to finish. Instead we take an elevated |
|
* reference and push the drop until after we've completed our |
|
* unblock processing. |
|
* |
|
* 2) There might be another process with a final reference, |
|
* waiting on us to finish processing. If this is the case, we |
|
* detect it and exit out - there's no more dentries anyway. |
|
*/ |
|
static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
|
int blocking) |
|
{ |
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); |
|
struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); |
|
struct dentry *dentry; |
|
unsigned long flags; |
|
int extra_ref = 0; |
|
|
|
/* |
|
* This node is blocking another node from getting a read |
|
* lock. This happens when we've renamed within a |
|
* directory. We've forced the other nodes to d_delete(), but |
|
* we never actually dropped our lock because it's still |
|
* valid. The downconvert code will retain a PR for this node, |
|
* so there's no further work to do. |
|
*/ |
|
if (blocking == DLM_LOCK_PR) |
|
return UNBLOCK_CONTINUE; |
|
|
|
/* |
|
* Mark this inode as potentially orphaned. The code in |
|
* ocfs2_delete_inode() will figure out whether it actually |
|
* needs to be freed or not. |
|
*/ |
|
spin_lock(&oi->ip_lock); |
|
oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; |
|
spin_unlock(&oi->ip_lock); |
|
|
|
/* |
|
* Yuck. We need to make sure however that the check of |
|
* OCFS2_LOCK_FREEING and the extra reference are atomic with |
|
* respect to a reference decrement or the setting of that |
|
* flag. |
|
*/ |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
spin_lock(&dentry_attach_lock); |
|
if (!(lockres->l_flags & OCFS2_LOCK_FREEING) |
|
&& dl->dl_count) { |
|
dl->dl_count++; |
|
extra_ref = 1; |
|
} |
|
spin_unlock(&dentry_attach_lock); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
mlog(0, "extra_ref = %d\n", extra_ref); |
|
|
|
/* |
|
* We have a process waiting on us in ocfs2_dentry_iput(), |
|
* which means we can't have any more outstanding |
|
* aliases. There's no need to do any more work. |
|
*/ |
|
if (!extra_ref) |
|
return UNBLOCK_CONTINUE; |
|
|
|
spin_lock(&dentry_attach_lock); |
|
while (1) { |
|
dentry = ocfs2_find_local_alias(dl->dl_inode, |
|
dl->dl_parent_blkno, 1); |
|
if (!dentry) |
|
break; |
|
spin_unlock(&dentry_attach_lock); |
|
|
|
if (S_ISDIR(dl->dl_inode->i_mode)) |
|
shrink_dcache_parent(dentry); |
|
|
|
mlog(0, "d_delete(%pd);\n", dentry); |
|
|
|
/* |
|
* The following dcache calls may do an |
|
* iput(). Normally we don't want that from the |
|
* downconverting thread, but in this case it's ok |
|
* because the requesting node already has an |
|
* exclusive lock on the inode, so it can't be queued |
|
* for a downconvert. |
|
*/ |
|
d_delete(dentry); |
|
dput(dentry); |
|
|
|
spin_lock(&dentry_attach_lock); |
|
} |
|
spin_unlock(&dentry_attach_lock); |
|
|
|
/* |
|
* If we are the last holder of this dentry lock, there is no |
|
* reason to downconvert so skip straight to the unlock. |
|
*/ |
|
if (dl->dl_count == 1) |
|
return UNBLOCK_STOP_POST; |
|
|
|
return UNBLOCK_CONTINUE_POST; |
|
} |
|
|
|
static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
|
int new_level) |
|
{ |
|
struct ocfs2_refcount_tree *tree = |
|
ocfs2_lock_res_refcount_tree(lockres); |
|
|
|
return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); |
|
} |
|
|
|
static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, |
|
int blocking) |
|
{ |
|
struct ocfs2_refcount_tree *tree = |
|
ocfs2_lock_res_refcount_tree(lockres); |
|
|
|
ocfs2_metadata_cache_purge(&tree->rf_ci); |
|
|
|
return UNBLOCK_CONTINUE; |
|
} |
|
|
|
static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
|
{ |
|
struct ocfs2_qinfo_lvb *lvb; |
|
struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); |
|
struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, |
|
oinfo->dqi_gi.dqi_type); |
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
|
lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); |
|
lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); |
|
lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); |
|
lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); |
|
lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); |
|
lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); |
|
} |
|
|
|
void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) |
|
{ |
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; |
|
struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
|
|
if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
} |
|
|
|
static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) |
|
{ |
|
struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, |
|
oinfo->dqi_gi.dqi_type); |
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; |
|
struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
|
struct buffer_head *bh = NULL; |
|
struct ocfs2_global_disk_dqinfo *gdinfo; |
|
int status = 0; |
|
|
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
|
lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { |
|
info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
|
info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); |
|
oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); |
|
oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); |
|
oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); |
|
oinfo->dqi_gi.dqi_free_entry = |
|
be32_to_cpu(lvb->lvb_free_entry); |
|
} else { |
|
status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
|
oinfo->dqi_giblk, &bh); |
|
if (status) { |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
gdinfo = (struct ocfs2_global_disk_dqinfo *) |
|
(bh->b_data + OCFS2_GLOBAL_INFO_OFF); |
|
info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); |
|
info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); |
|
oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); |
|
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); |
|
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); |
|
oinfo->dqi_gi.dqi_free_entry = |
|
le32_to_cpu(gdinfo->dqi_free_entry); |
|
brelse(bh); |
|
ocfs2_track_lock_refresh(lockres); |
|
} |
|
|
|
bail: |
|
return status; |
|
} |
|
|
|
/* Lock quota info, this function expects at least shared lock on the quota file |
|
* so that we can safely refresh quota info from disk. */ |
|
int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) |
|
{ |
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; |
|
struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
int status = 0; |
|
|
|
/* On RO devices, locking really isn't needed... */ |
|
if (ocfs2_is_hard_readonly(osb)) { |
|
if (ex) |
|
status = -EROFS; |
|
goto bail; |
|
} |
|
if (ocfs2_mount_local(osb)) |
|
goto bail; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
|
if (status < 0) { |
|
mlog_errno(status); |
|
goto bail; |
|
} |
|
if (!ocfs2_should_refresh_lock_res(lockres)) |
|
goto bail; |
|
/* OK, we have the lock but we need to refresh the quota info */ |
|
status = ocfs2_refresh_qinfo(oinfo); |
|
if (status) |
|
ocfs2_qinfo_unlock(oinfo, ex); |
|
ocfs2_complete_lock_res_refresh(lockres, status); |
|
bail: |
|
return status; |
|
} |
|
|
|
int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
|
{ |
|
int status; |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; |
|
struct ocfs2_super *osb = lockres->l_priv; |
|
|
|
|
|
if (ocfs2_is_hard_readonly(osb)) |
|
return -EROFS; |
|
|
|
if (ocfs2_mount_local(osb)) |
|
return 0; |
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
return status; |
|
} |
|
|
|
void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) |
|
{ |
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
|
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; |
|
struct ocfs2_super *osb = lockres->l_priv; |
|
|
|
if (!ocfs2_mount_local(osb)) |
|
ocfs2_cluster_unlock(osb, lockres, level); |
|
} |
|
|
|
static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
int status; |
|
struct ocfs2_unblock_ctl ctl = {0, 0,}; |
|
unsigned long flags; |
|
|
|
/* Our reference to the lockres in this function can be |
|
* considered valid until we remove the OCFS2_LOCK_QUEUED |
|
* flag. */ |
|
|
|
BUG_ON(!lockres); |
|
BUG_ON(!lockres->l_ops); |
|
|
|
mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
|
|
|
/* Detect whether a lock has been marked as going away while |
|
* the downconvert thread was processing other things. A lock can |
|
* still be marked with OCFS2_LOCK_FREEING after this check, |
|
* but short circuiting here will still save us some |
|
* performance. */ |
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
if (lockres->l_flags & OCFS2_LOCK_FREEING) |
|
goto unqueue; |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
status = ocfs2_unblock_lock(osb, lockres, &ctl); |
|
if (status < 0) |
|
mlog_errno(status); |
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags); |
|
unqueue: |
|
if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
|
lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
|
} else |
|
ocfs2_schedule_blocked_lock(osb, lockres); |
|
|
|
mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
|
ctl.requeue ? "yes" : "no"); |
|
spin_unlock_irqrestore(&lockres->l_lock, flags); |
|
|
|
if (ctl.unblock_action != UNBLOCK_CONTINUE |
|
&& lockres->l_ops->post_unlock) |
|
lockres->l_ops->post_unlock(osb, lockres); |
|
} |
|
|
|
static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
|
struct ocfs2_lock_res *lockres) |
|
{ |
|
unsigned long flags; |
|
|
|
assert_spin_locked(&lockres->l_lock); |
|
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING) { |
|
/* Do not schedule a lock for downconvert when it's on |
|
* the way to destruction - any nodes wanting access |
|
* to the resource will get it soon. */ |
|
mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
|
lockres->l_name, lockres->l_flags); |
|
return; |
|
} |
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
if (list_empty(&lockres->l_blocked_list)) { |
|
list_add_tail(&lockres->l_blocked_list, |
|
&osb->blocked_lock_list); |
|
osb->blocked_lock_count++; |
|
} |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
} |
|
|
|
static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) |
|
{ |
|
unsigned long processed; |
|
unsigned long flags; |
|
struct ocfs2_lock_res *lockres; |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
/* grab this early so we know to try again if a state change and |
|
* wake happens part-way through our work */ |
|
osb->dc_work_sequence = osb->dc_wake_sequence; |
|
|
|
processed = osb->blocked_lock_count; |
|
/* |
|
* blocked lock processing in this loop might call iput which can |
|
* remove items off osb->blocked_lock_list. Downconvert up to |
|
* 'processed' number of locks, but stop short if we had some |
|
* removed in ocfs2_mark_lockres_freeing when downconverting. |
|
*/ |
|
while (processed && !list_empty(&osb->blocked_lock_list)) { |
|
lockres = list_entry(osb->blocked_lock_list.next, |
|
struct ocfs2_lock_res, l_blocked_list); |
|
list_del_init(&lockres->l_blocked_list); |
|
osb->blocked_lock_count--; |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
|
|
BUG_ON(!processed); |
|
processed--; |
|
|
|
ocfs2_process_blocked_lock(osb, lockres); |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
} |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
} |
|
|
|
static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) |
|
{ |
|
int empty = 0; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
if (list_empty(&osb->blocked_lock_list)) |
|
empty = 1; |
|
|
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
return empty; |
|
} |
|
|
|
static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) |
|
{ |
|
int should_wake = 0; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
if (osb->dc_work_sequence != osb->dc_wake_sequence) |
|
should_wake = 1; |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
|
|
return should_wake; |
|
} |
|
|
|
static int ocfs2_downconvert_thread(void *arg) |
|
{ |
|
struct ocfs2_super *osb = arg; |
|
|
|
/* only quit once we've been asked to stop and there is no more |
|
* work available */ |
|
while (!(kthread_should_stop() && |
|
ocfs2_downconvert_thread_lists_empty(osb))) { |
|
|
|
wait_event_interruptible(osb->dc_event, |
|
ocfs2_downconvert_thread_should_wake(osb) || |
|
kthread_should_stop()); |
|
|
|
mlog(0, "downconvert_thread: awoken\n"); |
|
|
|
ocfs2_downconvert_thread_do_work(osb); |
|
} |
|
|
|
osb->dc_task = NULL; |
|
return 0; |
|
} |
|
|
|
void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&osb->dc_task_lock, flags); |
|
/* make sure the voting thread gets a swipe at whatever changes |
|
* the caller may have made to the voting state */ |
|
osb->dc_wake_sequence++; |
|
spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
|
wake_up(&osb->dc_event); |
|
}
|
|
|