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ocfs2: handle async EAGAIN from NOQUEUE request 

When using fsdlm, -EAGAIN is returned in the async callback for NOQUEUE
requests. Fix up dlmglue to expect this.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
David Teigland 2008-01-30 16:52:53 -08:00 committed by Mark Fasheh
parent de551246e7
commit 1693a5c011
1 changed files with 23 additions and 4 deletions
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27
fs/ocfs2/dlmglue.c
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@ -880,13 +880,20 @@ static void ocfs2_locking_ast(void *opaque)
struct ocfs2_lock_res *lockres = opaque;
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
unsigned long flags;
int status;
spin_lock_irqsave(&lockres->l_lock, flags);
if (ocfs2_dlm_lock_status(&lockres->l_lksb)) {
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,
ocfs2_dlm_lock_status(&lockres->l_lksb));
lockres->l_name, status);
spin_unlock_irqrestore(&lockres->l_lock, flags);
return;
}
@ -909,7 +916,7 @@ static void ocfs2_locking_ast(void *opaque)
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;
@ -1113,6 +1120,7 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
unsigned long flags;
unsigned int gen;
int noqueue_attempted = 0;
mlog_entry_void();
@ -1157,6 +1165,13 @@ static int ocfs2_cluster_lock(struct ocfs2_super *osb,
}
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);
@ -1621,6 +1636,10 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock)
* to just bubble sucess 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: