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743 lines
19 KiB
743 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* dlmlock.c |
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* |
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* underlying calls for lock creation |
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* |
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* Copyright (C) 2004 Oracle. All rights reserved. |
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*/ |
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#include <linux/module.h> |
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#include <linux/fs.h> |
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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/init.h> |
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#include <linux/sysctl.h> |
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#include <linux/random.h> |
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#include <linux/blkdev.h> |
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#include <linux/socket.h> |
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#include <linux/inet.h> |
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#include <linux/spinlock.h> |
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#include <linux/delay.h> |
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#include "../cluster/heartbeat.h" |
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#include "../cluster/nodemanager.h" |
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#include "../cluster/tcp.h" |
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|
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#include "dlmapi.h" |
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#include "dlmcommon.h" |
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#include "dlmconvert.h" |
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#define MLOG_MASK_PREFIX ML_DLM |
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#include "../cluster/masklog.h" |
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static struct kmem_cache *dlm_lock_cache; |
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|
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static DEFINE_SPINLOCK(dlm_cookie_lock); |
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static u64 dlm_next_cookie = 1; |
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static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, |
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struct dlm_lock_resource *res, |
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struct dlm_lock *lock, int flags); |
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static void dlm_init_lock(struct dlm_lock *newlock, int type, |
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u8 node, u64 cookie); |
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static void dlm_lock_release(struct kref *kref); |
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static void dlm_lock_detach_lockres(struct dlm_lock *lock); |
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|
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int dlm_init_lock_cache(void) |
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{ |
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dlm_lock_cache = kmem_cache_create("o2dlm_lock", |
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sizeof(struct dlm_lock), |
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0, SLAB_HWCACHE_ALIGN, NULL); |
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if (dlm_lock_cache == NULL) |
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return -ENOMEM; |
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return 0; |
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} |
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|
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void dlm_destroy_lock_cache(void) |
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{ |
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kmem_cache_destroy(dlm_lock_cache); |
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} |
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|
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/* Tell us whether we can grant a new lock request. |
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* locking: |
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* caller needs: res->spinlock |
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* taken: none |
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* held on exit: none |
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* returns: 1 if the lock can be granted, 0 otherwise. |
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*/ |
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static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, |
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struct dlm_lock *lock) |
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{ |
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struct dlm_lock *tmplock; |
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|
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list_for_each_entry(tmplock, &res->granted, list) { |
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if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
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return 0; |
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} |
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list_for_each_entry(tmplock, &res->converting, list) { |
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if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
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return 0; |
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if (!dlm_lock_compatible(tmplock->ml.convert_type, |
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lock->ml.type)) |
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return 0; |
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} |
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|
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return 1; |
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} |
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|
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/* performs lock creation at the lockres master site |
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* locking: |
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* caller needs: none |
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* taken: takes and drops res->spinlock |
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* held on exit: none |
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* returns: DLM_NORMAL, DLM_NOTQUEUED |
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*/ |
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static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, |
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struct dlm_lock_resource *res, |
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struct dlm_lock *lock, int flags) |
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{ |
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int call_ast = 0, kick_thread = 0; |
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enum dlm_status status = DLM_NORMAL; |
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|
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mlog(0, "type=%d\n", lock->ml.type); |
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|
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spin_lock(&res->spinlock); |
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/* if called from dlm_create_lock_handler, need to |
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* ensure it will not sleep in dlm_wait_on_lockres */ |
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status = __dlm_lockres_state_to_status(res); |
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if (status != DLM_NORMAL && |
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lock->ml.node != dlm->node_num) { |
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/* erf. state changed after lock was dropped. */ |
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spin_unlock(&res->spinlock); |
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dlm_error(status); |
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return status; |
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} |
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__dlm_wait_on_lockres(res); |
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__dlm_lockres_reserve_ast(res); |
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|
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if (dlm_can_grant_new_lock(res, lock)) { |
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mlog(0, "I can grant this lock right away\n"); |
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/* got it right away */ |
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lock->lksb->status = DLM_NORMAL; |
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status = DLM_NORMAL; |
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dlm_lock_get(lock); |
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list_add_tail(&lock->list, &res->granted); |
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|
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/* for the recovery lock, we can't allow the ast |
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* to be queued since the dlmthread is already |
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* frozen. but the recovery lock is always locked |
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* with LKM_NOQUEUE so we do not need the ast in |
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* this special case */ |
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if (!dlm_is_recovery_lock(res->lockname.name, |
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res->lockname.len)) { |
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kick_thread = 1; |
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call_ast = 1; |
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} else { |
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mlog(0, "%s: returning DLM_NORMAL to " |
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"node %u for reco lock\n", dlm->name, |
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lock->ml.node); |
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} |
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} else { |
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/* for NOQUEUE request, unless we get the |
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* lock right away, return DLM_NOTQUEUED */ |
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if (flags & LKM_NOQUEUE) { |
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status = DLM_NOTQUEUED; |
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if (dlm_is_recovery_lock(res->lockname.name, |
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res->lockname.len)) { |
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mlog(0, "%s: returning NOTQUEUED to " |
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"node %u for reco lock\n", dlm->name, |
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lock->ml.node); |
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} |
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} else { |
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status = DLM_NORMAL; |
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dlm_lock_get(lock); |
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list_add_tail(&lock->list, &res->blocked); |
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kick_thread = 1; |
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} |
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} |
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spin_unlock(&res->spinlock); |
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wake_up(&res->wq); |
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|
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/* either queue the ast or release it */ |
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if (call_ast) |
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dlm_queue_ast(dlm, lock); |
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else |
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dlm_lockres_release_ast(dlm, res); |
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|
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dlm_lockres_calc_usage(dlm, res); |
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if (kick_thread) |
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dlm_kick_thread(dlm, res); |
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|
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return status; |
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} |
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|
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void dlm_revert_pending_lock(struct dlm_lock_resource *res, |
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struct dlm_lock *lock) |
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{ |
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/* remove from local queue if it failed */ |
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list_del_init(&lock->list); |
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lock->lksb->flags &= ~DLM_LKSB_GET_LVB; |
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} |
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/* |
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* locking: |
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* caller needs: none |
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* taken: takes and drops res->spinlock |
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* held on exit: none |
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* returns: DLM_DENIED, DLM_RECOVERING, or net status |
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*/ |
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static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, |
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struct dlm_lock_resource *res, |
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struct dlm_lock *lock, int flags) |
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{ |
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enum dlm_status status = DLM_DENIED; |
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int lockres_changed = 1; |
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|
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mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n", |
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lock->ml.type, res->lockname.len, |
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res->lockname.name, flags); |
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|
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/* |
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* Wait if resource is getting recovered, remastered, etc. |
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* If the resource was remastered and new owner is self, then exit. |
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*/ |
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spin_lock(&res->spinlock); |
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__dlm_wait_on_lockres(res); |
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if (res->owner == dlm->node_num) { |
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spin_unlock(&res->spinlock); |
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return DLM_RECOVERING; |
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} |
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res->state |= DLM_LOCK_RES_IN_PROGRESS; |
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|
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/* add lock to local (secondary) queue */ |
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dlm_lock_get(lock); |
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list_add_tail(&lock->list, &res->blocked); |
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lock->lock_pending = 1; |
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spin_unlock(&res->spinlock); |
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|
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/* spec seems to say that you will get DLM_NORMAL when the lock |
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* has been queued, meaning we need to wait for a reply here. */ |
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status = dlm_send_remote_lock_request(dlm, res, lock, flags); |
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|
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spin_lock(&res->spinlock); |
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res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
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lock->lock_pending = 0; |
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if (status != DLM_NORMAL) { |
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if (status == DLM_RECOVERING && |
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dlm_is_recovery_lock(res->lockname.name, |
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res->lockname.len)) { |
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/* recovery lock was mastered by dead node. |
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* we need to have calc_usage shoot down this |
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* lockres and completely remaster it. */ |
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mlog(0, "%s: recovery lock was owned by " |
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"dead node %u, remaster it now.\n", |
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dlm->name, res->owner); |
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} else if (status != DLM_NOTQUEUED) { |
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/* |
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* DO NOT call calc_usage, as this would unhash |
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* the remote lockres before we ever get to use |
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* it. treat as if we never made any change to |
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* the lockres. |
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*/ |
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lockres_changed = 0; |
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dlm_error(status); |
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} |
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dlm_revert_pending_lock(res, lock); |
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dlm_lock_put(lock); |
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} else if (dlm_is_recovery_lock(res->lockname.name, |
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res->lockname.len)) { |
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/* special case for the $RECOVERY lock. |
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* there will never be an AST delivered to put |
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* this lock on the proper secondary queue |
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* (granted), so do it manually. */ |
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mlog(0, "%s: $RECOVERY lock for this node (%u) is " |
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"mastered by %u; got lock, manually granting (no ast)\n", |
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dlm->name, dlm->node_num, res->owner); |
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list_move_tail(&lock->list, &res->granted); |
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} |
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spin_unlock(&res->spinlock); |
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|
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if (lockres_changed) |
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dlm_lockres_calc_usage(dlm, res); |
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|
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wake_up(&res->wq); |
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return status; |
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} |
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|
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|
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/* for remote lock creation. |
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* locking: |
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* caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS |
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* taken: none |
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* held on exit: none |
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* returns: DLM_NOLOCKMGR, or net status |
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*/ |
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static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, |
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struct dlm_lock_resource *res, |
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struct dlm_lock *lock, int flags) |
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{ |
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struct dlm_create_lock create; |
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int tmpret, status = 0; |
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enum dlm_status ret; |
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|
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memset(&create, 0, sizeof(create)); |
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create.node_idx = dlm->node_num; |
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create.requested_type = lock->ml.type; |
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create.cookie = lock->ml.cookie; |
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create.namelen = res->lockname.len; |
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create.flags = cpu_to_be32(flags); |
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memcpy(create.name, res->lockname.name, create.namelen); |
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|
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tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create, |
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sizeof(create), res->owner, &status); |
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if (tmpret >= 0) { |
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ret = status; |
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if (ret == DLM_REJECTED) { |
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mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer " |
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"owned by node %u. That node is coming back up " |
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"currently.\n", dlm->name, create.namelen, |
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create.name, res->owner); |
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dlm_print_one_lock_resource(res); |
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BUG(); |
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} |
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} else { |
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mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to " |
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"node %u\n", dlm->name, create.namelen, create.name, |
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tmpret, res->owner); |
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if (dlm_is_host_down(tmpret)) |
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ret = DLM_RECOVERING; |
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else |
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ret = dlm_err_to_dlm_status(tmpret); |
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} |
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|
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return ret; |
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} |
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void dlm_lock_get(struct dlm_lock *lock) |
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{ |
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kref_get(&lock->lock_refs); |
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} |
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|
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void dlm_lock_put(struct dlm_lock *lock) |
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{ |
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kref_put(&lock->lock_refs, dlm_lock_release); |
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} |
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|
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static void dlm_lock_release(struct kref *kref) |
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{ |
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struct dlm_lock *lock; |
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|
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lock = container_of(kref, struct dlm_lock, lock_refs); |
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|
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BUG_ON(!list_empty(&lock->list)); |
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BUG_ON(!list_empty(&lock->ast_list)); |
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BUG_ON(!list_empty(&lock->bast_list)); |
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BUG_ON(lock->ast_pending); |
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BUG_ON(lock->bast_pending); |
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dlm_lock_detach_lockres(lock); |
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|
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if (lock->lksb_kernel_allocated) { |
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mlog(0, "freeing kernel-allocated lksb\n"); |
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kfree(lock->lksb); |
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} |
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kmem_cache_free(dlm_lock_cache, lock); |
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} |
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|
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/* associate a lock with it's lockres, getting a ref on the lockres */ |
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void dlm_lock_attach_lockres(struct dlm_lock *lock, |
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struct dlm_lock_resource *res) |
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{ |
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dlm_lockres_get(res); |
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lock->lockres = res; |
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} |
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|
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/* drop ref on lockres, if there is still one associated with lock */ |
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static void dlm_lock_detach_lockres(struct dlm_lock *lock) |
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{ |
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struct dlm_lock_resource *res; |
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|
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res = lock->lockres; |
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if (res) { |
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lock->lockres = NULL; |
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mlog(0, "removing lock's lockres reference\n"); |
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dlm_lockres_put(res); |
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} |
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} |
|
|
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static void dlm_init_lock(struct dlm_lock *newlock, int type, |
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u8 node, u64 cookie) |
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{ |
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INIT_LIST_HEAD(&newlock->list); |
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INIT_LIST_HEAD(&newlock->ast_list); |
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INIT_LIST_HEAD(&newlock->bast_list); |
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spin_lock_init(&newlock->spinlock); |
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newlock->ml.type = type; |
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newlock->ml.convert_type = LKM_IVMODE; |
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newlock->ml.highest_blocked = LKM_IVMODE; |
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newlock->ml.node = node; |
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newlock->ml.pad1 = 0; |
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newlock->ml.list = 0; |
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newlock->ml.flags = 0; |
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newlock->ast = NULL; |
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newlock->bast = NULL; |
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newlock->astdata = NULL; |
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newlock->ml.cookie = cpu_to_be64(cookie); |
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newlock->ast_pending = 0; |
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newlock->bast_pending = 0; |
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newlock->convert_pending = 0; |
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newlock->lock_pending = 0; |
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newlock->unlock_pending = 0; |
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newlock->cancel_pending = 0; |
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newlock->lksb_kernel_allocated = 0; |
|
|
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kref_init(&newlock->lock_refs); |
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} |
|
|
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struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, |
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struct dlm_lockstatus *lksb) |
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{ |
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struct dlm_lock *lock; |
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int kernel_allocated = 0; |
|
|
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lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS); |
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if (!lock) |
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return NULL; |
|
|
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if (!lksb) { |
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/* zero memory only if kernel-allocated */ |
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lksb = kzalloc(sizeof(*lksb), GFP_NOFS); |
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if (!lksb) { |
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kmem_cache_free(dlm_lock_cache, lock); |
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return NULL; |
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} |
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kernel_allocated = 1; |
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} |
|
|
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dlm_init_lock(lock, type, node, cookie); |
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if (kernel_allocated) |
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lock->lksb_kernel_allocated = 1; |
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lock->lksb = lksb; |
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lksb->lockid = lock; |
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return lock; |
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} |
|
|
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/* handler for lock creation net message |
|
* locking: |
|
* caller needs: none |
|
* taken: takes and drops res->spinlock |
|
* held on exit: none |
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* returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED |
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*/ |
|
int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
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void **ret_data) |
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{ |
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struct dlm_ctxt *dlm = data; |
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struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; |
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struct dlm_lock_resource *res = NULL; |
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struct dlm_lock *newlock = NULL; |
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struct dlm_lockstatus *lksb = NULL; |
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enum dlm_status status = DLM_NORMAL; |
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char *name; |
|
unsigned int namelen; |
|
|
|
BUG_ON(!dlm); |
|
|
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if (!dlm_grab(dlm)) |
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return DLM_REJECTED; |
|
|
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name = create->name; |
|
namelen = create->namelen; |
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status = DLM_REJECTED; |
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if (!dlm_domain_fully_joined(dlm)) { |
|
mlog(ML_ERROR, "Domain %s not fully joined, but node %u is " |
|
"sending a create_lock message for lock %.*s!\n", |
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dlm->name, create->node_idx, namelen, name); |
|
dlm_error(status); |
|
goto leave; |
|
} |
|
|
|
status = DLM_IVBUFLEN; |
|
if (namelen > DLM_LOCKID_NAME_MAX) { |
|
dlm_error(status); |
|
goto leave; |
|
} |
|
|
|
status = DLM_SYSERR; |
|
newlock = dlm_new_lock(create->requested_type, |
|
create->node_idx, |
|
be64_to_cpu(create->cookie), NULL); |
|
if (!newlock) { |
|
dlm_error(status); |
|
goto leave; |
|
} |
|
|
|
lksb = newlock->lksb; |
|
|
|
if (be32_to_cpu(create->flags) & LKM_GET_LVB) { |
|
lksb->flags |= DLM_LKSB_GET_LVB; |
|
mlog(0, "set DLM_LKSB_GET_LVB flag\n"); |
|
} |
|
|
|
status = DLM_IVLOCKID; |
|
res = dlm_lookup_lockres(dlm, name, namelen); |
|
if (!res) { |
|
dlm_error(status); |
|
goto leave; |
|
} |
|
|
|
spin_lock(&res->spinlock); |
|
status = __dlm_lockres_state_to_status(res); |
|
spin_unlock(&res->spinlock); |
|
|
|
if (status != DLM_NORMAL) { |
|
mlog(0, "lockres recovering/migrating/in-progress\n"); |
|
goto leave; |
|
} |
|
|
|
dlm_lock_attach_lockres(newlock, res); |
|
|
|
status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); |
|
leave: |
|
if (status != DLM_NORMAL) |
|
if (newlock) |
|
dlm_lock_put(newlock); |
|
|
|
if (res) |
|
dlm_lockres_put(res); |
|
|
|
dlm_put(dlm); |
|
|
|
return status; |
|
} |
|
|
|
|
|
/* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ |
|
static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) |
|
{ |
|
u64 tmpnode = node_num; |
|
|
|
/* shift single byte of node num into top 8 bits */ |
|
tmpnode <<= 56; |
|
|
|
spin_lock(&dlm_cookie_lock); |
|
*cookie = (dlm_next_cookie | tmpnode); |
|
if (++dlm_next_cookie & 0xff00000000000000ull) { |
|
mlog(0, "This node's cookie will now wrap!\n"); |
|
dlm_next_cookie = 1; |
|
} |
|
spin_unlock(&dlm_cookie_lock); |
|
} |
|
|
|
enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, |
|
struct dlm_lockstatus *lksb, int flags, |
|
const char *name, int namelen, dlm_astlockfunc_t *ast, |
|
void *data, dlm_bastlockfunc_t *bast) |
|
{ |
|
enum dlm_status status; |
|
struct dlm_lock_resource *res = NULL; |
|
struct dlm_lock *lock = NULL; |
|
int convert = 0, recovery = 0; |
|
|
|
/* yes this function is a mess. |
|
* TODO: clean this up. lots of common code in the |
|
* lock and convert paths, especially in the retry blocks */ |
|
if (!lksb) { |
|
dlm_error(DLM_BADARGS); |
|
return DLM_BADARGS; |
|
} |
|
|
|
status = DLM_BADPARAM; |
|
if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
if (flags & ~LKM_VALID_FLAGS) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
convert = (flags & LKM_CONVERT); |
|
recovery = (flags & LKM_RECOVERY); |
|
|
|
if (recovery && |
|
(!dlm_is_recovery_lock(name, namelen) || convert) ) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
if (convert && (flags & LKM_LOCAL)) { |
|
mlog(ML_ERROR, "strange LOCAL convert request!\n"); |
|
goto error; |
|
} |
|
|
|
if (convert) { |
|
/* CONVERT request */ |
|
|
|
/* if converting, must pass in a valid dlm_lock */ |
|
lock = lksb->lockid; |
|
if (!lock) { |
|
mlog(ML_ERROR, "NULL lock pointer in convert " |
|
"request\n"); |
|
goto error; |
|
} |
|
|
|
res = lock->lockres; |
|
if (!res) { |
|
mlog(ML_ERROR, "NULL lockres pointer in convert " |
|
"request\n"); |
|
goto error; |
|
} |
|
dlm_lockres_get(res); |
|
|
|
/* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are |
|
* static after the original lock call. convert requests will |
|
* ensure that everything is the same, or return DLM_BADARGS. |
|
* this means that DLM_DENIED_NOASTS will never be returned. |
|
*/ |
|
if (lock->lksb != lksb || lock->ast != ast || |
|
lock->bast != bast || lock->astdata != data) { |
|
status = DLM_BADARGS; |
|
mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " |
|
"astdata=%p\n", lksb, ast, bast, data); |
|
mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " |
|
"astdata=%p\n", lock->lksb, lock->ast, |
|
lock->bast, lock->astdata); |
|
goto error; |
|
} |
|
retry_convert: |
|
dlm_wait_for_recovery(dlm); |
|
|
|
if (res->owner == dlm->node_num) |
|
status = dlmconvert_master(dlm, res, lock, flags, mode); |
|
else |
|
status = dlmconvert_remote(dlm, res, lock, flags, mode); |
|
if (status == DLM_RECOVERING || status == DLM_MIGRATING || |
|
status == DLM_FORWARD) { |
|
/* for now, see how this works without sleeping |
|
* and just retry right away. I suspect the reco |
|
* or migration will complete fast enough that |
|
* no waiting will be necessary */ |
|
mlog(0, "retrying convert with migration/recovery/" |
|
"in-progress\n"); |
|
msleep(100); |
|
goto retry_convert; |
|
} |
|
} else { |
|
u64 tmpcookie; |
|
|
|
/* LOCK request */ |
|
status = DLM_BADARGS; |
|
if (!name) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
status = DLM_IVBUFLEN; |
|
if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
dlm_get_next_cookie(dlm->node_num, &tmpcookie); |
|
lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb); |
|
if (!lock) { |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
if (!recovery) |
|
dlm_wait_for_recovery(dlm); |
|
|
|
/* find or create the lock resource */ |
|
res = dlm_get_lock_resource(dlm, name, namelen, flags); |
|
if (!res) { |
|
status = DLM_IVLOCKID; |
|
dlm_error(status); |
|
goto error; |
|
} |
|
|
|
mlog(0, "type=%d, flags = 0x%x\n", mode, flags); |
|
mlog(0, "creating lock: lock=%p res=%p\n", lock, res); |
|
|
|
dlm_lock_attach_lockres(lock, res); |
|
lock->ast = ast; |
|
lock->bast = bast; |
|
lock->astdata = data; |
|
|
|
retry_lock: |
|
if (flags & LKM_VALBLK) { |
|
mlog(0, "LKM_VALBLK passed by caller\n"); |
|
|
|
/* LVB requests for non PR, PW or EX locks are |
|
* ignored. */ |
|
if (mode < LKM_PRMODE) |
|
flags &= ~LKM_VALBLK; |
|
else { |
|
flags |= LKM_GET_LVB; |
|
lock->lksb->flags |= DLM_LKSB_GET_LVB; |
|
} |
|
} |
|
|
|
if (res->owner == dlm->node_num) |
|
status = dlmlock_master(dlm, res, lock, flags); |
|
else |
|
status = dlmlock_remote(dlm, res, lock, flags); |
|
|
|
if (status == DLM_RECOVERING || status == DLM_MIGRATING || |
|
status == DLM_FORWARD) { |
|
msleep(100); |
|
if (recovery) { |
|
if (status != DLM_RECOVERING) |
|
goto retry_lock; |
|
/* wait to see the node go down, then |
|
* drop down and allow the lockres to |
|
* get cleaned up. need to remaster. */ |
|
dlm_wait_for_node_death(dlm, res->owner, |
|
DLM_NODE_DEATH_WAIT_MAX); |
|
} else { |
|
dlm_wait_for_recovery(dlm); |
|
goto retry_lock; |
|
} |
|
} |
|
|
|
/* Inflight taken in dlm_get_lock_resource() is dropped here */ |
|
spin_lock(&res->spinlock); |
|
dlm_lockres_drop_inflight_ref(dlm, res); |
|
spin_unlock(&res->spinlock); |
|
|
|
dlm_lockres_calc_usage(dlm, res); |
|
dlm_kick_thread(dlm, res); |
|
|
|
if (status != DLM_NORMAL) { |
|
lock->lksb->flags &= ~DLM_LKSB_GET_LVB; |
|
if (status != DLM_NOTQUEUED) |
|
dlm_error(status); |
|
goto error; |
|
} |
|
} |
|
|
|
error: |
|
if (status != DLM_NORMAL) { |
|
if (lock && !convert) |
|
dlm_lock_put(lock); |
|
// this is kind of unnecessary |
|
lksb->status = status; |
|
} |
|
|
|
/* put lockres ref from the convert path |
|
* or from dlm_get_lock_resource */ |
|
if (res) |
|
dlm_lockres_put(res); |
|
|
|
return status; |
|
} |
|
EXPORT_SYMBOL_GPL(dlmlock);
|
|
|