ceph: avoid iput() while holding spinlock in ceph_dir_fsync

ceph_mdsc_put_request() can call iput(), which can sleep.  Don't do that.

Fixes: #1812
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index a421555b229d..974ef1e4d268 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1218,6 +1218,7 @@ static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
         do {
                 ceph_mdsc_get_request(req);
                 spin_unlock(&ci->i_unsafe_lock);
+
                 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
                      inode, req->r_tid, last_tid);
                 if (req->r_timeout) {
@@ -1230,9 +1231,9 @@ static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
                 } else {
                         wait_for_completion(&req->r_safe_completion);
                 }
-                spin_lock(&ci->i_unsafe_lock);
                 ceph_mdsc_put_request(req);
 
+                spin_lock(&ci->i_unsafe_lock);
                 if (ret || list_empty(head))
                         break;
                 req = list_entry(head->next,