From: Joseph Qi <joseph.qi@xxxxxxxxxx>
Subject: ocfs2/dlm: fix race between convert and migration
Commit ac7cf246dfdb ("ocfs2/dlm: fix race between convert and recovery")
checks if lockres master has changed to identify whether new master has
finished recovery or not. This will introduce a race that right after old
master does umount ( means master will change), a new convert request
comes.
In this case, it will reset lockres state to DLM_RECOVERING and then retry
convert, and then fail with lockres->l_action being set to
OCFS2_AST_INVALID, which will cause inconsistent lock level between ocfs2
and dlm, and then finally BUG.
Since dlm recovery will clear lock->convert_pending in
dlm_move_lockres_to_recovery_list, we can use it to correctly identify the
race case between convert and recovery. So fix it.
Fixes: ac7cf246dfdb ("ocfs2/dlm: fix race between convert and recovery")
Link: http://lkml.kernel.org/r/57CE1569.8010704@xxxxxxxxxx
Signed-off-by: Joseph Qi <joseph.qi@xxxxxxxxxx>
Signed-off-by: Jun Piao <piaojun@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/dlm/dlmconvert.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff -puN fs/ocfs2/dlm/dlmconvert.c~ocfs2-dlm-fix-race-between-convert-and-migration fs/ocfs2/dlm/dlmconvert.c
--- a/fs/ocfs2/dlm/dlmconvert.c~ocfs2-dlm-fix-race-between-convert-and-migration
+++ a/fs/ocfs2/dlm/dlmconvert.c
@@ -268,7 +268,6 @@ enum dlm_status dlmconvert_remote(struct
struct dlm_lock *lock, int flags, int type)
{
enum dlm_status status;
- u8 old_owner = res->owner;
mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);
@@ -335,7 +334,6 @@ enum dlm_status dlmconvert_remote(struct
spin_lock(&res->spinlock);
res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
- lock->convert_pending = 0;
/* if it failed, move it back to granted queue.
* if master returns DLM_NORMAL and then down before sending ast,
* it may have already been moved to granted queue, reset to
@@ -344,12 +342,14 @@ enum dlm_status dlmconvert_remote(struct
if (status != DLM_NOTQUEUED)
dlm_error(status);
dlm_revert_pending_convert(res, lock);
- } else if ((res->state & DLM_LOCK_RES_RECOVERING) ||
- (old_owner != res->owner)) {
- mlog(0, "res %.*s is in recovering or has been recovered.\n",
- res->lockname.len, res->lockname.name);
+ } else if (!lock->convert_pending) {
+ mlog(0, "%s: res %.*s, owner died and lock has been moved back "
+ "to granted list, retry convert.\n",
+ dlm->name, res->lockname.len, res->lockname.name);
status = DLM_RECOVERING;
}
+
+ lock->convert_pending = 0;
bail:
spin_unlock(&res->spinlock);
_
--
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