From: Pavel Machek pavel@ucw.cz
[ Upstream commit 57c720d4144a9c2b88105c3e8f7b0e97e4b5cc93 ]
Based on what fails, function can return with nfs_sync_rwlock either locked or unlocked. That can not be right.
Always return with lock unlocked on error.
Fixes: 4cd9973f9ff6 ("ocfs2: avoid inode removal while nfsd is accessing it") Signed-off-by: Pavel Machek (CIP) pavel@denx.de Signed-off-by: Andrew Morton akpm@linux-foundation.org Reviewed-by: Joseph Qi joseph.qi@linux.alibaba.com Reviewed-by: Andrew Morton akpm@linux-foundation.org Cc: Mark Fasheh mark@fasheh.com Cc: Joel Becker jlbec@evilplan.org Cc: Junxiao Bi junxiao.bi@oracle.com Cc: Changwei Ge gechangwei@live.cn Cc: Gang He ghe@suse.com Cc: Jun Piao piaojun@huawei.com Link: http://lkml.kernel.org/r/20200724124443.GA28164@duo.ucw.cz Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ocfs2/dlmglue.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index e2c34c704185d..50a863fc17792 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2871,9 +2871,15 @@ int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, 0, 0); - if (status < 0) + if (status < 0) { mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
+ if (ex) + up_write(&osb->nfs_sync_rwlock); + else + up_read(&osb->nfs_sync_rwlock); + } + return status; }