// SPDX-License-Identifier: GPL-2.0-or-later
|
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* userdlm.c
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*
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* Code which implements the kernel side of a minimal userspace
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* interface to our DLM.
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*
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* Many of the functions here are pared down versions of dlmglue.c
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* functions.
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*/
|
|
#include <linux/signal.h>
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#include <linux/sched/signal.h>
|
|
#include <linux/module.h>
|
#include <linux/fs.h>
|
#include <linux/types.h>
|
#include <linux/crc32.h>
|
|
#include "../ocfs2_lockingver.h"
|
#include "../stackglue.h"
|
#include "userdlm.h"
|
|
#define MLOG_MASK_PREFIX ML_DLMFS
|
#include "../cluster/masklog.h"
|
|
|
static inline struct user_lock_res *user_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb)
|
{
|
return container_of(lksb, struct user_lock_res, l_lksb);
|
}
|
|
static inline int user_check_wait_flag(struct user_lock_res *lockres,
|
int flag)
|
{
|
int ret;
|
|
spin_lock(&lockres->l_lock);
|
ret = lockres->l_flags & flag;
|
spin_unlock(&lockres->l_lock);
|
|
return ret;
|
}
|
|
static inline void user_wait_on_busy_lock(struct user_lock_res *lockres)
|
|
{
|
wait_event(lockres->l_event,
|
!user_check_wait_flag(lockres, USER_LOCK_BUSY));
|
}
|
|
static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres)
|
|
{
|
wait_event(lockres->l_event,
|
!user_check_wait_flag(lockres, USER_LOCK_BLOCKED));
|
}
|
|
/* I heart container_of... */
|
static inline struct ocfs2_cluster_connection *
|
cluster_connection_from_user_lockres(struct user_lock_res *lockres)
|
{
|
struct dlmfs_inode_private *ip;
|
|
ip = container_of(lockres,
|
struct dlmfs_inode_private,
|
ip_lockres);
|
return ip->ip_conn;
|
}
|
|
static struct inode *
|
user_dlm_inode_from_user_lockres(struct user_lock_res *lockres)
|
{
|
struct dlmfs_inode_private *ip;
|
|
ip = container_of(lockres,
|
struct dlmfs_inode_private,
|
ip_lockres);
|
return &ip->ip_vfs_inode;
|
}
|
|
static inline void user_recover_from_dlm_error(struct user_lock_res *lockres)
|
{
|
spin_lock(&lockres->l_lock);
|
lockres->l_flags &= ~USER_LOCK_BUSY;
|
spin_unlock(&lockres->l_lock);
|
}
|
|
#define user_log_dlm_error(_func, _stat, _lockres) do { \
|
mlog(ML_ERROR, "Dlm error %d while calling %s on " \
|
"resource %.*s\n", _stat, _func, \
|
_lockres->l_namelen, _lockres->l_name); \
|
} while (0)
|
|
/* 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 user_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 user_ast(struct ocfs2_dlm_lksb *lksb)
|
{
|
struct user_lock_res *lockres = user_lksb_to_lock_res(lksb);
|
int status;
|
|
mlog(ML_BASTS, "AST fired for lockres %.*s, level %d => %d\n",
|
lockres->l_namelen, lockres->l_name, lockres->l_level,
|
lockres->l_requested);
|
|
spin_lock(&lockres->l_lock);
|
|
status = ocfs2_dlm_lock_status(&lockres->l_lksb);
|
if (status) {
|
mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n",
|
status, lockres->l_namelen, lockres->l_name);
|
spin_unlock(&lockres->l_lock);
|
return;
|
}
|
|
mlog_bug_on_msg(lockres->l_requested == DLM_LOCK_IV,
|
"Lockres %.*s, requested ivmode. flags 0x%x\n",
|
lockres->l_namelen, lockres->l_name, lockres->l_flags);
|
|
/* we're downconverting. */
|
if (lockres->l_requested < lockres->l_level) {
|
if (lockres->l_requested <=
|
user_highest_compat_lock_level(lockres->l_blocking)) {
|
lockres->l_blocking = DLM_LOCK_NL;
|
lockres->l_flags &= ~USER_LOCK_BLOCKED;
|
}
|
}
|
|
lockres->l_level = lockres->l_requested;
|
lockres->l_requested = DLM_LOCK_IV;
|
lockres->l_flags |= USER_LOCK_ATTACHED;
|
lockres->l_flags &= ~USER_LOCK_BUSY;
|
|
spin_unlock(&lockres->l_lock);
|
|
wake_up(&lockres->l_event);
|
}
|
|
static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
|
{
|
struct inode *inode;
|
inode = user_dlm_inode_from_user_lockres(lockres);
|
if (!igrab(inode))
|
BUG();
|
}
|
|
static void user_dlm_unblock_lock(struct work_struct *work);
|
|
static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
|
{
|
if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
|
user_dlm_grab_inode_ref(lockres);
|
|
INIT_WORK(&lockres->l_work, user_dlm_unblock_lock);
|
|
queue_work(user_dlm_worker, &lockres->l_work);
|
lockres->l_flags |= USER_LOCK_QUEUED;
|
}
|
}
|
|
static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres)
|
{
|
int queue = 0;
|
|
if (!(lockres->l_flags & USER_LOCK_BLOCKED))
|
return;
|
|
switch (lockres->l_blocking) {
|
case DLM_LOCK_EX:
|
if (!lockres->l_ex_holders && !lockres->l_ro_holders)
|
queue = 1;
|
break;
|
case DLM_LOCK_PR:
|
if (!lockres->l_ex_holders)
|
queue = 1;
|
break;
|
default:
|
BUG();
|
}
|
|
if (queue)
|
__user_dlm_queue_lockres(lockres);
|
}
|
|
static void user_bast(struct ocfs2_dlm_lksb *lksb, int level)
|
{
|
struct user_lock_res *lockres = user_lksb_to_lock_res(lksb);
|
|
mlog(ML_BASTS, "BAST fired for lockres %.*s, blocking %d, level %d\n",
|
lockres->l_namelen, lockres->l_name, level, lockres->l_level);
|
|
spin_lock(&lockres->l_lock);
|
lockres->l_flags |= USER_LOCK_BLOCKED;
|
if (level > lockres->l_blocking)
|
lockres->l_blocking = level;
|
|
__user_dlm_queue_lockres(lockres);
|
spin_unlock(&lockres->l_lock);
|
|
wake_up(&lockres->l_event);
|
}
|
|
static void user_unlock_ast(struct ocfs2_dlm_lksb *lksb, int status)
|
{
|
struct user_lock_res *lockres = user_lksb_to_lock_res(lksb);
|
|
mlog(ML_BASTS, "UNLOCK AST fired for lockres %.*s, flags 0x%x\n",
|
lockres->l_namelen, lockres->l_name, lockres->l_flags);
|
|
if (status)
|
mlog(ML_ERROR, "dlm returns status %d\n", status);
|
|
spin_lock(&lockres->l_lock);
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/* The teardown flag gets set early during the unlock process,
|
* so test the cancel flag to make sure that this ast isn't
|
* for a concurrent cancel. */
|
if (lockres->l_flags & USER_LOCK_IN_TEARDOWN
|
&& !(lockres->l_flags & USER_LOCK_IN_CANCEL)) {
|
lockres->l_level = DLM_LOCK_IV;
|
} else if (status == DLM_CANCELGRANT) {
|
/* We tried to cancel a convert request, but it was
|
* already granted. Don't clear the busy flag - the
|
* ast should've done this already. */
|
BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
|
lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
|
goto out_noclear;
|
} else {
|
BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
|
/* Cancel succeeded, we want to re-queue */
|
lockres->l_requested = DLM_LOCK_IV; /* cancel an
|
* upconvert
|
* request. */
|
lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
|
/* we want the unblock thread to look at it again
|
* now. */
|
if (lockres->l_flags & USER_LOCK_BLOCKED)
|
__user_dlm_queue_lockres(lockres);
|
}
|
|
lockres->l_flags &= ~USER_LOCK_BUSY;
|
out_noclear:
|
spin_unlock(&lockres->l_lock);
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|
wake_up(&lockres->l_event);
|
}
|
|
/*
|
* This is the userdlmfs locking protocol version.
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*
|
* See fs/ocfs2/dlmglue.c for more details on locking versions.
|
*/
|
static struct ocfs2_locking_protocol user_dlm_lproto = {
|
.lp_max_version = {
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.pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
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.pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
|
},
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.lp_lock_ast = user_ast,
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.lp_blocking_ast = user_bast,
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.lp_unlock_ast = user_unlock_ast,
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};
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static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres)
|
{
|
struct inode *inode;
|
inode = user_dlm_inode_from_user_lockres(lockres);
|
iput(inode);
|
}
|
|
static void user_dlm_unblock_lock(struct work_struct *work)
|
{
|
int new_level, status;
|
struct user_lock_res *lockres =
|
container_of(work, struct user_lock_res, l_work);
|
struct ocfs2_cluster_connection *conn =
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cluster_connection_from_user_lockres(lockres);
|
|
mlog(0, "lockres %.*s\n", lockres->l_namelen, lockres->l_name);
|
|
spin_lock(&lockres->l_lock);
|
|
mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED),
|
"Lockres %.*s, flags 0x%x\n",
|
lockres->l_namelen, lockres->l_name, lockres->l_flags);
|
|
/* notice that we don't clear USER_LOCK_BLOCKED here. If it's
|
* set, we want user_ast clear it. */
|
lockres->l_flags &= ~USER_LOCK_QUEUED;
|
|
/* It's valid to get here and no longer be blocked - if we get
|
* several basts in a row, we might be queued by the first
|
* one, the unblock thread might run and clear the queued
|
* flag, and finally we might get another bast which re-queues
|
* us before our ast for the downconvert is called. */
|
if (!(lockres->l_flags & USER_LOCK_BLOCKED)) {
|
mlog(ML_BASTS, "lockres %.*s USER_LOCK_BLOCKED\n",
|
lockres->l_namelen, lockres->l_name);
|
spin_unlock(&lockres->l_lock);
|
goto drop_ref;
|
}
|
|
if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
|
mlog(ML_BASTS, "lockres %.*s USER_LOCK_IN_TEARDOWN\n",
|
lockres->l_namelen, lockres->l_name);
|
spin_unlock(&lockres->l_lock);
|
goto drop_ref;
|
}
|
|
if (lockres->l_flags & USER_LOCK_BUSY) {
|
if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
|
mlog(ML_BASTS, "lockres %.*s USER_LOCK_IN_CANCEL\n",
|
lockres->l_namelen, lockres->l_name);
|
spin_unlock(&lockres->l_lock);
|
goto drop_ref;
|
}
|
|
lockres->l_flags |= USER_LOCK_IN_CANCEL;
|
spin_unlock(&lockres->l_lock);
|
|
status = ocfs2_dlm_unlock(conn, &lockres->l_lksb,
|
DLM_LKF_CANCEL);
|
if (status)
|
user_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
|
goto drop_ref;
|
}
|
|
/* If there are still incompat holders, we can exit safely
|
* without worrying about re-queueing this lock as that will
|
* happen on the last call to user_cluster_unlock. */
|
if ((lockres->l_blocking == DLM_LOCK_EX)
|
&& (lockres->l_ex_holders || lockres->l_ro_holders)) {
|
spin_unlock(&lockres->l_lock);
|
mlog(ML_BASTS, "lockres %.*s, EX/PR Holders %u,%u\n",
|
lockres->l_namelen, lockres->l_name,
|
lockres->l_ex_holders, lockres->l_ro_holders);
|
goto drop_ref;
|
}
|
|
if ((lockres->l_blocking == DLM_LOCK_PR)
|
&& lockres->l_ex_holders) {
|
spin_unlock(&lockres->l_lock);
|
mlog(ML_BASTS, "lockres %.*s, EX Holders %u\n",
|
lockres->l_namelen, lockres->l_name,
|
lockres->l_ex_holders);
|
goto drop_ref;
|
}
|
|
/* yay, we can downconvert now. */
|
new_level = user_highest_compat_lock_level(lockres->l_blocking);
|
lockres->l_requested = new_level;
|
lockres->l_flags |= USER_LOCK_BUSY;
|
mlog(ML_BASTS, "lockres %.*s, downconvert %d => %d\n",
|
lockres->l_namelen, lockres->l_name, lockres->l_level, new_level);
|
spin_unlock(&lockres->l_lock);
|
|
/* need lock downconvert request now... */
|
status = ocfs2_dlm_lock(conn, new_level, &lockres->l_lksb,
|
DLM_LKF_CONVERT|DLM_LKF_VALBLK,
|
lockres->l_name,
|
lockres->l_namelen);
|
if (status) {
|
user_log_dlm_error("ocfs2_dlm_lock", status, lockres);
|
user_recover_from_dlm_error(lockres);
|
}
|
|
drop_ref:
|
user_dlm_drop_inode_ref(lockres);
|
}
|
|
static inline void user_dlm_inc_holders(struct user_lock_res *lockres,
|
int level)
|
{
|
switch(level) {
|
case DLM_LOCK_EX:
|
lockres->l_ex_holders++;
|
break;
|
case DLM_LOCK_PR:
|
lockres->l_ro_holders++;
|
break;
|
default:
|
BUG();
|
}
|
}
|
|
/* 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
|
user_may_continue_on_blocked_lock(struct user_lock_res *lockres,
|
int wanted)
|
{
|
BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
|
|
return wanted <= user_highest_compat_lock_level(lockres->l_blocking);
|
}
|
|
int user_dlm_cluster_lock(struct user_lock_res *lockres,
|
int level,
|
int lkm_flags)
|
{
|
int status, local_flags;
|
struct ocfs2_cluster_connection *conn =
|
cluster_connection_from_user_lockres(lockres);
|
|
if (level != DLM_LOCK_EX &&
|
level != DLM_LOCK_PR) {
|
mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
|
lockres->l_namelen, lockres->l_name);
|
status = -EINVAL;
|
goto bail;
|
}
|
|
mlog(ML_BASTS, "lockres %.*s, level %d, flags = 0x%x\n",
|
lockres->l_namelen, lockres->l_name, level, lkm_flags);
|
|
again:
|
if (signal_pending(current)) {
|
status = -ERESTARTSYS;
|
goto bail;
|
}
|
|
spin_lock(&lockres->l_lock);
|
if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
|
spin_unlock(&lockres->l_lock);
|
status = -EAGAIN;
|
goto bail;
|
}
|
|
/* 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 & USER_LOCK_BUSY) &&
|
(level > lockres->l_level)) {
|
/* is someone sitting in dlm_lock? If so, wait on
|
* them. */
|
spin_unlock(&lockres->l_lock);
|
|
user_wait_on_busy_lock(lockres);
|
goto again;
|
}
|
|
if ((lockres->l_flags & USER_LOCK_BLOCKED) &&
|
(!user_may_continue_on_blocked_lock(lockres, level))) {
|
/* is the lock is currently blocked on behalf of
|
* another node */
|
spin_unlock(&lockres->l_lock);
|
|
user_wait_on_blocked_lock(lockres);
|
goto again;
|
}
|
|
if (level > lockres->l_level) {
|
local_flags = lkm_flags | DLM_LKF_VALBLK;
|
if (lockres->l_level != DLM_LOCK_IV)
|
local_flags |= DLM_LKF_CONVERT;
|
|
lockres->l_requested = level;
|
lockres->l_flags |= USER_LOCK_BUSY;
|
spin_unlock(&lockres->l_lock);
|
|
BUG_ON(level == DLM_LOCK_IV);
|
BUG_ON(level == DLM_LOCK_NL);
|
|
/* call dlm_lock to upgrade lock now */
|
status = ocfs2_dlm_lock(conn, level, &lockres->l_lksb,
|
local_flags, lockres->l_name,
|
lockres->l_namelen);
|
if (status) {
|
if ((lkm_flags & DLM_LKF_NOQUEUE) &&
|
(status != -EAGAIN))
|
user_log_dlm_error("ocfs2_dlm_lock",
|
status, lockres);
|
user_recover_from_dlm_error(lockres);
|
goto bail;
|
}
|
|
user_wait_on_busy_lock(lockres);
|
goto again;
|
}
|
|
user_dlm_inc_holders(lockres, level);
|
spin_unlock(&lockres->l_lock);
|
|
status = 0;
|
bail:
|
return status;
|
}
|
|
static inline void user_dlm_dec_holders(struct user_lock_res *lockres,
|
int level)
|
{
|
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();
|
}
|
}
|
|
void user_dlm_cluster_unlock(struct user_lock_res *lockres,
|
int level)
|
{
|
if (level != DLM_LOCK_EX &&
|
level != DLM_LOCK_PR) {
|
mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
|
lockres->l_namelen, lockres->l_name);
|
return;
|
}
|
|
spin_lock(&lockres->l_lock);
|
user_dlm_dec_holders(lockres, level);
|
__user_dlm_cond_queue_lockres(lockres);
|
spin_unlock(&lockres->l_lock);
|
}
|
|
void user_dlm_write_lvb(struct inode *inode,
|
const char *val,
|
unsigned int len)
|
{
|
struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
|
char *lvb;
|
|
BUG_ON(len > DLM_LVB_LEN);
|
|
spin_lock(&lockres->l_lock);
|
|
BUG_ON(lockres->l_level < DLM_LOCK_EX);
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
memcpy(lvb, val, len);
|
|
spin_unlock(&lockres->l_lock);
|
}
|
|
bool user_dlm_read_lvb(struct inode *inode, char *val)
|
{
|
struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
|
char *lvb;
|
bool ret = true;
|
|
spin_lock(&lockres->l_lock);
|
|
BUG_ON(lockres->l_level < DLM_LOCK_PR);
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)) {
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
memcpy(val, lvb, DLM_LVB_LEN);
|
} else
|
ret = false;
|
|
spin_unlock(&lockres->l_lock);
|
return ret;
|
}
|
|
void user_dlm_lock_res_init(struct user_lock_res *lockres,
|
struct dentry *dentry)
|
{
|
memset(lockres, 0, sizeof(*lockres));
|
|
spin_lock_init(&lockres->l_lock);
|
init_waitqueue_head(&lockres->l_event);
|
lockres->l_level = DLM_LOCK_IV;
|
lockres->l_requested = DLM_LOCK_IV;
|
lockres->l_blocking = DLM_LOCK_IV;
|
|
/* should have been checked before getting here. */
|
BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN);
|
|
memcpy(lockres->l_name,
|
dentry->d_name.name,
|
dentry->d_name.len);
|
lockres->l_namelen = dentry->d_name.len;
|
}
|
|
int user_dlm_destroy_lock(struct user_lock_res *lockres)
|
{
|
int status = -EBUSY;
|
struct ocfs2_cluster_connection *conn =
|
cluster_connection_from_user_lockres(lockres);
|
|
mlog(ML_BASTS, "lockres %.*s\n", lockres->l_namelen, lockres->l_name);
|
|
spin_lock(&lockres->l_lock);
|
if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
|
spin_unlock(&lockres->l_lock);
|
goto bail;
|
}
|
|
lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
|
|
while (lockres->l_flags & USER_LOCK_BUSY) {
|
spin_unlock(&lockres->l_lock);
|
|
user_wait_on_busy_lock(lockres);
|
|
spin_lock(&lockres->l_lock);
|
}
|
|
if (lockres->l_ro_holders || lockres->l_ex_holders) {
|
lockres->l_flags &= ~USER_LOCK_IN_TEARDOWN;
|
spin_unlock(&lockres->l_lock);
|
goto bail;
|
}
|
|
status = 0;
|
if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
|
/*
|
* lock is never requested, leave USER_LOCK_IN_TEARDOWN set
|
* to avoid new lock request coming in.
|
*/
|
spin_unlock(&lockres->l_lock);
|
goto bail;
|
}
|
|
lockres->l_flags &= ~USER_LOCK_ATTACHED;
|
lockres->l_flags |= USER_LOCK_BUSY;
|
spin_unlock(&lockres->l_lock);
|
|
status = ocfs2_dlm_unlock(conn, &lockres->l_lksb, DLM_LKF_VALBLK);
|
if (status) {
|
spin_lock(&lockres->l_lock);
|
lockres->l_flags &= ~USER_LOCK_IN_TEARDOWN;
|
lockres->l_flags &= ~USER_LOCK_BUSY;
|
spin_unlock(&lockres->l_lock);
|
user_log_dlm_error("ocfs2_dlm_unlock", status, lockres);
|
goto bail;
|
}
|
|
user_wait_on_busy_lock(lockres);
|
|
status = 0;
|
bail:
|
return status;
|
}
|
|
static void user_dlm_recovery_handler_noop(int node_num,
|
void *recovery_data)
|
{
|
/* We ignore recovery events */
|
return;
|
}
|
|
void user_dlm_set_locking_protocol(void)
|
{
|
ocfs2_stack_glue_set_max_proto_version(&user_dlm_lproto.lp_max_version);
|
}
|
|
struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name)
|
{
|
int rc;
|
struct ocfs2_cluster_connection *conn;
|
|
rc = ocfs2_cluster_connect_agnostic(name->name, name->len,
|
&user_dlm_lproto,
|
user_dlm_recovery_handler_noop,
|
NULL, &conn);
|
if (rc)
|
mlog_errno(rc);
|
|
return rc ? ERR_PTR(rc) : conn;
|
}
|
|
void user_dlm_unregister(struct ocfs2_cluster_connection *conn)
|
{
|
ocfs2_cluster_disconnect(conn, 0);
|
}
|
