// SPDX-License-Identifier: GPL-2.0-or-later
|
/* -*- mode: c; c-basic-offset: 8; -*-
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
*
|
* dlmlock.c
|
*
|
* underlying calls for lock creation
|
*
|
* Copyright (C) 2004 Oracle. All rights reserved.
|
*/
|
|
|
#include <linux/module.h>
|
#include <linux/fs.h>
|
#include <linux/types.h>
|
#include <linux/slab.h>
|
#include <linux/highmem.h>
|
#include <linux/init.h>
|
#include <linux/sysctl.h>
|
#include <linux/random.h>
|
#include <linux/blkdev.h>
|
#include <linux/socket.h>
|
#include <linux/inet.h>
|
#include <linux/spinlock.h>
|
#include <linux/delay.h>
|
|
|
#include "../cluster/heartbeat.h"
|
#include "../cluster/nodemanager.h"
|
#include "../cluster/tcp.h"
|
|
#include "dlmapi.h"
|
#include "dlmcommon.h"
|
|
#include "dlmconvert.h"
|
|
#define MLOG_MASK_PREFIX ML_DLM
|
#include "../cluster/masklog.h"
|
|
static struct kmem_cache *dlm_lock_cache;
|
|
static DEFINE_SPINLOCK(dlm_cookie_lock);
|
static u64 dlm_next_cookie = 1;
|
|
static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
|
struct dlm_lock_resource *res,
|
struct dlm_lock *lock, int flags);
|
static void dlm_init_lock(struct dlm_lock *newlock, int type,
|
u8 node, u64 cookie);
|
static void dlm_lock_release(struct kref *kref);
|
static void dlm_lock_detach_lockres(struct dlm_lock *lock);
|
|
int dlm_init_lock_cache(void)
|
{
|
dlm_lock_cache = kmem_cache_create("o2dlm_lock",
|
sizeof(struct dlm_lock),
|
0, SLAB_HWCACHE_ALIGN, NULL);
|
if (dlm_lock_cache == NULL)
|
return -ENOMEM;
|
return 0;
|
}
|
|
void dlm_destroy_lock_cache(void)
|
{
|
kmem_cache_destroy(dlm_lock_cache);
|
}
|
|
/* Tell us whether we can grant a new lock request.
|
* locking:
|
* caller needs: res->spinlock
|
* taken: none
|
* held on exit: none
|
* returns: 1 if the lock can be granted, 0 otherwise.
|
*/
|
static int dlm_can_grant_new_lock(struct dlm_lock_resource *res,
|
struct dlm_lock *lock)
|
{
|
struct dlm_lock *tmplock;
|
|
list_for_each_entry(tmplock, &res->granted, list) {
|
if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
|
return 0;
|
}
|
|
list_for_each_entry(tmplock, &res->converting, list) {
|
if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
|
return 0;
|
if (!dlm_lock_compatible(tmplock->ml.convert_type,
|
lock->ml.type))
|
return 0;
|
}
|
|
return 1;
|
}
|
|
/* performs lock creation at the lockres master site
|
* locking:
|
* caller needs: none
|
* taken: takes and drops res->spinlock
|
* held on exit: none
|
* returns: DLM_NORMAL, DLM_NOTQUEUED
|
*/
|
static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
|
struct dlm_lock_resource *res,
|
struct dlm_lock *lock, int flags)
|
{
|
int call_ast = 0, kick_thread = 0;
|
enum dlm_status status = DLM_NORMAL;
|
|
mlog(0, "type=%d\n", lock->ml.type);
|
|
spin_lock(&res->spinlock);
|
/* if called from dlm_create_lock_handler, need to
|
* ensure it will not sleep in dlm_wait_on_lockres */
|
status = __dlm_lockres_state_to_status(res);
|
if (status != DLM_NORMAL &&
|
lock->ml.node != dlm->node_num) {
|
/* erf. state changed after lock was dropped. */
|
spin_unlock(&res->spinlock);
|
dlm_error(status);
|
return status;
|
}
|
__dlm_wait_on_lockres(res);
|
__dlm_lockres_reserve_ast(res);
|
|
if (dlm_can_grant_new_lock(res, lock)) {
|
mlog(0, "I can grant this lock right away\n");
|
/* got it right away */
|
lock->lksb->status = DLM_NORMAL;
|
status = DLM_NORMAL;
|
dlm_lock_get(lock);
|
list_add_tail(&lock->list, &res->granted);
|
|
/* for the recovery lock, we can't allow the ast
|
* to be queued since the dlmthread is already
|
* frozen. but the recovery lock is always locked
|
* with LKM_NOQUEUE so we do not need the ast in
|
* this special case */
|
if (!dlm_is_recovery_lock(res->lockname.name,
|
res->lockname.len)) {
|
kick_thread = 1;
|
call_ast = 1;
|
} else {
|
mlog(0, "%s: returning DLM_NORMAL to "
|
"node %u for reco lock\n", dlm->name,
|
lock->ml.node);
|
}
|
} else {
|
/* for NOQUEUE request, unless we get the
|
* lock right away, return DLM_NOTQUEUED */
|
if (flags & LKM_NOQUEUE) {
|
status = DLM_NOTQUEUED;
|
if (dlm_is_recovery_lock(res->lockname.name,
|
res->lockname.len)) {
|
mlog(0, "%s: returning NOTQUEUED to "
|
"node %u for reco lock\n", dlm->name,
|
lock->ml.node);
|
}
|
} else {
|
status = DLM_NORMAL;
|
dlm_lock_get(lock);
|
list_add_tail(&lock->list, &res->blocked);
|
kick_thread = 1;
|
}
|
}
|
|
spin_unlock(&res->spinlock);
|
wake_up(&res->wq);
|
|
/* either queue the ast or release it */
|
if (call_ast)
|
dlm_queue_ast(dlm, lock);
|
else
|
dlm_lockres_release_ast(dlm, res);
|
|
dlm_lockres_calc_usage(dlm, res);
|
if (kick_thread)
|
dlm_kick_thread(dlm, res);
|
|
return status;
|
}
|
|
void dlm_revert_pending_lock(struct dlm_lock_resource *res,
|
struct dlm_lock *lock)
|
{
|
/* remove from local queue if it failed */
|
list_del_init(&lock->list);
|
lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
|
}
|
|
|
/*
|
* locking:
|
* caller needs: none
|
* taken: takes and drops res->spinlock
|
* held on exit: none
|
* returns: DLM_DENIED, DLM_RECOVERING, or net status
|
*/
|
static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
|
struct dlm_lock_resource *res,
|
struct dlm_lock *lock, int flags)
|
{
|
enum dlm_status status = DLM_DENIED;
|
int lockres_changed = 1;
|
|
mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n",
|
lock->ml.type, res->lockname.len,
|
res->lockname.name, flags);
|
|
/*
|
* Wait if resource is getting recovered, remastered, etc.
|
* If the resource was remastered and new owner is self, then exit.
|
*/
|
spin_lock(&res->spinlock);
|
__dlm_wait_on_lockres(res);
|
if (res->owner == dlm->node_num) {
|
spin_unlock(&res->spinlock);
|
return DLM_RECOVERING;
|
}
|
res->state |= DLM_LOCK_RES_IN_PROGRESS;
|
|
/* add lock to local (secondary) queue */
|
dlm_lock_get(lock);
|
list_add_tail(&lock->list, &res->blocked);
|
lock->lock_pending = 1;
|
spin_unlock(&res->spinlock);
|
|
/* spec seems to say that you will get DLM_NORMAL when the lock
|
* has been queued, meaning we need to wait for a reply here. */
|
status = dlm_send_remote_lock_request(dlm, res, lock, flags);
|
|
spin_lock(&res->spinlock);
|
res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
|
lock->lock_pending = 0;
|
if (status != DLM_NORMAL) {
|
if (status == DLM_RECOVERING &&
|
dlm_is_recovery_lock(res->lockname.name,
|
res->lockname.len)) {
|
/* recovery lock was mastered by dead node.
|
* we need to have calc_usage shoot down this
|
* lockres and completely remaster it. */
|
mlog(0, "%s: recovery lock was owned by "
|
"dead node %u, remaster it now.\n",
|
dlm->name, res->owner);
|
} else if (status != DLM_NOTQUEUED) {
|
/*
|
* DO NOT call calc_usage, as this would unhash
|
* the remote lockres before we ever get to use
|
* it. treat as if we never made any change to
|
* the lockres.
|
*/
|
lockres_changed = 0;
|
dlm_error(status);
|
}
|
dlm_revert_pending_lock(res, lock);
|
dlm_lock_put(lock);
|
} else if (dlm_is_recovery_lock(res->lockname.name,
|
res->lockname.len)) {
|
/* special case for the $RECOVERY lock.
|
* there will never be an AST delivered to put
|
* this lock on the proper secondary queue
|
* (granted), so do it manually. */
|
mlog(0, "%s: $RECOVERY lock for this node (%u) is "
|
"mastered by %u; got lock, manually granting (no ast)\n",
|
dlm->name, dlm->node_num, res->owner);
|
list_move_tail(&lock->list, &res->granted);
|
}
|
spin_unlock(&res->spinlock);
|
|
if (lockres_changed)
|
dlm_lockres_calc_usage(dlm, res);
|
|
wake_up(&res->wq);
|
return status;
|
}
|
|
|
/* for remote lock creation.
|
* locking:
|
* caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS
|
* taken: none
|
* held on exit: none
|
* returns: DLM_NOLOCKMGR, or net status
|
*/
|
static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
|
struct dlm_lock_resource *res,
|
struct dlm_lock *lock, int flags)
|
{
|
struct dlm_create_lock create;
|
int tmpret, status = 0;
|
enum dlm_status ret;
|
|
memset(&create, 0, sizeof(create));
|
create.node_idx = dlm->node_num;
|
create.requested_type = lock->ml.type;
|
create.cookie = lock->ml.cookie;
|
create.namelen = res->lockname.len;
|
create.flags = cpu_to_be32(flags);
|
memcpy(create.name, res->lockname.name, create.namelen);
|
|
tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create,
|
sizeof(create), res->owner, &status);
|
if (tmpret >= 0) {
|
ret = status;
|
if (ret == DLM_REJECTED) {
|
mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer "
|
"owned by node %u. That node is coming back up "
|
"currently.\n", dlm->name, create.namelen,
|
create.name, res->owner);
|
dlm_print_one_lock_resource(res);
|
BUG();
|
}
|
} else {
|
mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to "
|
"node %u\n", dlm->name, create.namelen, create.name,
|
tmpret, res->owner);
|
if (dlm_is_host_down(tmpret))
|
ret = DLM_RECOVERING;
|
else
|
ret = dlm_err_to_dlm_status(tmpret);
|
}
|
|
return ret;
|
}
|
|
void dlm_lock_get(struct dlm_lock *lock)
|
{
|
kref_get(&lock->lock_refs);
|
}
|
|
void dlm_lock_put(struct dlm_lock *lock)
|
{
|
kref_put(&lock->lock_refs, dlm_lock_release);
|
}
|
|
static void dlm_lock_release(struct kref *kref)
|
{
|
struct dlm_lock *lock;
|
|
lock = container_of(kref, struct dlm_lock, lock_refs);
|
|
BUG_ON(!list_empty(&lock->list));
|
BUG_ON(!list_empty(&lock->ast_list));
|
BUG_ON(!list_empty(&lock->bast_list));
|
BUG_ON(lock->ast_pending);
|
BUG_ON(lock->bast_pending);
|
|
dlm_lock_detach_lockres(lock);
|
|
if (lock->lksb_kernel_allocated) {
|
mlog(0, "freeing kernel-allocated lksb\n");
|
kfree(lock->lksb);
|
}
|
kmem_cache_free(dlm_lock_cache, lock);
|
}
|
|
/* associate a lock with it's lockres, getting a ref on the lockres */
|
void dlm_lock_attach_lockres(struct dlm_lock *lock,
|
struct dlm_lock_resource *res)
|
{
|
dlm_lockres_get(res);
|
lock->lockres = res;
|
}
|
|
/* drop ref on lockres, if there is still one associated with lock */
|
static void dlm_lock_detach_lockres(struct dlm_lock *lock)
|
{
|
struct dlm_lock_resource *res;
|
|
res = lock->lockres;
|
if (res) {
|
lock->lockres = NULL;
|
mlog(0, "removing lock's lockres reference\n");
|
dlm_lockres_put(res);
|
}
|
}
|
|
static void dlm_init_lock(struct dlm_lock *newlock, int type,
|
u8 node, u64 cookie)
|
{
|
INIT_LIST_HEAD(&newlock->list);
|
INIT_LIST_HEAD(&newlock->ast_list);
|
INIT_LIST_HEAD(&newlock->bast_list);
|
spin_lock_init(&newlock->spinlock);
|
newlock->ml.type = type;
|
newlock->ml.convert_type = LKM_IVMODE;
|
newlock->ml.highest_blocked = LKM_IVMODE;
|
newlock->ml.node = node;
|
newlock->ml.pad1 = 0;
|
newlock->ml.list = 0;
|
newlock->ml.flags = 0;
|
newlock->ast = NULL;
|
newlock->bast = NULL;
|
newlock->astdata = NULL;
|
newlock->ml.cookie = cpu_to_be64(cookie);
|
newlock->ast_pending = 0;
|
newlock->bast_pending = 0;
|
newlock->convert_pending = 0;
|
newlock->lock_pending = 0;
|
newlock->unlock_pending = 0;
|
newlock->cancel_pending = 0;
|
newlock->lksb_kernel_allocated = 0;
|
|
kref_init(&newlock->lock_refs);
|
}
|
|
struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
|
struct dlm_lockstatus *lksb)
|
{
|
struct dlm_lock *lock;
|
int kernel_allocated = 0;
|
|
lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS);
|
if (!lock)
|
return NULL;
|
|
if (!lksb) {
|
/* zero memory only if kernel-allocated */
|
lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
|
if (!lksb) {
|
kmem_cache_free(dlm_lock_cache, lock);
|
return NULL;
|
}
|
kernel_allocated = 1;
|
}
|
|
dlm_init_lock(lock, type, node, cookie);
|
if (kernel_allocated)
|
lock->lksb_kernel_allocated = 1;
|
lock->lksb = lksb;
|
lksb->lockid = lock;
|
return lock;
|
}
|
|
/* handler for lock creation net message
|
* locking:
|
* caller needs: none
|
* taken: takes and drops res->spinlock
|
* held on exit: none
|
* returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
|
*/
|
int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
|
void **ret_data)
|
{
|
struct dlm_ctxt *dlm = data;
|
struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf;
|
struct dlm_lock_resource *res = NULL;
|
struct dlm_lock *newlock = NULL;
|
struct dlm_lockstatus *lksb = NULL;
|
enum dlm_status status = DLM_NORMAL;
|
char *name;
|
unsigned int namelen;
|
|
BUG_ON(!dlm);
|
|
if (!dlm_grab(dlm))
|
return DLM_REJECTED;
|
|
name = create->name;
|
namelen = create->namelen;
|
status = DLM_REJECTED;
|
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",
|
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);
|
