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Subject[PATCH 17/62] ocfs2: handle async EAGAIN from NOQUEUE request
Date
From: David Teigland <teigland@redhat.com>

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>
---
fs/ocfs2/dlmglue.c | 27 +++++++++++++++++++++++----
1 files changed, 23 insertions(+), 4 deletions(-)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 295c47f..b640423 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -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 @@ again:
}

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:
--
1.5.4.1


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