[PATCH 04/11] ocfs2: Fix possible deadlock in ocfs2_write_dquot()

From: Jan Kara
Date: Fri Jan 16 2009 - 13:09:50 EST

It could happen that some limit has been set via quotactl() and in parallel
->mark_dirty() is called from another thread doing e.g. dquot_alloc_space(). In
such case ocfs2_write_dquot() must not try to sync the dquot because that needs
global quota lock but that ranks above transaction start.

Signed-off-by: Jan Kara <jack@xxxxxxx>
Acked-by: Mark Fasheh <mfasheh@xxxxxxx>
fs/ocfs2/quota_global.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index f4efa89..1ed0f7c 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -754,7 +754,9 @@ static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
if (dquot->dq_flags & mask)
sync = 1;
- if (!sync) {
+ /* This is a slight hack but we can't afford getting global quota
+ * lock if we already have a transaction started. */
+ if (!sync || journal_current_handle()) {
status = ocfs2_write_dquot(dquot);
goto out;

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