From f8afead7169f0f28a4b421bcbdb510e52a2d094d Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Mon, 12 Jan 2009 23:20:32 +0100
Subject: [PATCH] ocfs2: Fix possible deadlock in ocfs2_write_dquot()
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@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/quota_global.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index f4efa89baee..1ed0f7c8686 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;
spin_unlock(&dq_data_lock);
- 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;
}
--
2.41.3