[Ocfs2-devel] [PATCH] ocfs2/dlm: Wait on lockres instead of erroring cancel requests
Goldwyn Rodrigues
rgoldwyn at gmail.com
Thu Aug 20 11:43:19 PDT 2009
In case a downconvert is queued, and a flock receives a signal,
BUG_ON(lockres->l_action != OCFS2_AST_INVALID) is triggered
because a lock cancel triggers a dlmunlock while an AST is
scheduled.
To avoid this, allow a LKM_CANCEL to pass through, and let it
wait on __dlm_wait_on_lockres().
Signed-off-by: Goldwyn Rodrigues <rgoldwyn at suse.de>
Signed-off-by: Mark Fasheh <mfasheh at suse.com>
---
diff --git a/fs/ocfs2/dlm/dlmunlock.c b/fs/ocfs2/dlm/dlmunlock.c
index fcf879e..756f5b0 100644
--- a/fs/ocfs2/dlm/dlmunlock.c
+++ b/fs/ocfs2/dlm/dlmunlock.c
@@ -122,7 +122,7 @@ static enum dlm_status dlmunlock_common(struct
dlm_ctxt *dlm,
* that still has AST's pending... */
in_use = !list_empty(&lock->ast_list);
spin_unlock(&dlm->ast_lock);
- if (in_use) {
+ if (in_use && !(flags & LKM_CANCEL)) {
mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
"while waiting for an ast!", res->lockname.len,
res->lockname.name);
@@ -131,7 +131,7 @@ static enum dlm_status dlmunlock_common(struct
dlm_ctxt *dlm,
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_IN_PROGRESS) {
- if (master_node) {
+ if (master_node && !(flags & LKM_CANCEL)) {
mlog(ML_ERROR, "lockres in progress!\n");
spin_unlock(&res->spinlock);
return DLM_FORWARD;
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