ocfs2: Push out dropping of dentry lock to ocfs2_wq

Dropping of last reference to dentry lock is a complicated operation involving
dropping of reference to inode. This can get complicated and quota code in
particular needs to obtain some quota locks which leads to potential deadlock.
Thus we defer dropping of inode reference to ocfs2_wq.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 43ed11345b59..b1cb38fbe807 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1887,6 +1887,9 @@ static int ocfs2_initialize_super(struct super_block *sb,
         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
         journal->j_state = OCFS2_JOURNAL_FREE;
 
+        INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
+        osb->dentry_lock_list = NULL;
+
         /* get some pseudo constants for clustersize bits */
         osb->s_clustersize_bits =
                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);