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authorJan Kara <jack@suse.cz>2009-01-12 23:20:32 +0100
committerMark Fasheh <mfasheh@suse.com>2009-02-02 14:20:17 -0800
commitf8afead7169f0f28a4b421bcbdb510e52a2d094d (patch)
tree83245132376808a9a03868b6beb28d66e1f2a8fa /fs
parentea455f8ab68338ba69f5d3362b342c115bea8e13 (diff)
downloadlinux-f8afead7169f0f28a4b421bcbdb510e52a2d094d.tar.gz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ocfs2/quota_global.c4
1 files changed, 3 insertions, 1 deletions
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;
}