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ceph: add missing locking to protect i_snap_realm_item during split

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All ci->i_snap_realm_item/realm->inodes_with_caps manipulation should be
protected by realm->inodes_with_caps_lock.  This bug would have only bit
us in a rare race with a realm split (during some snap creations).

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-09 12:52:26 -08:00
parent 978097c907
commit 052bb34af3
1 changed files with 2 additions and 0 deletions
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2
fs/ceph/snap.c
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@ -818,7 +818,9 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc,
* queued (again) by ceph_update_snap_trace() * queued (again) by ceph_update_snap_trace()
* below. Queue it _now_, under the old context. * below. Queue it _now_, under the old context.
*/ */
spin_lock(&realm->inodes_with_caps_lock);
list_del_init(&ci->i_snap_realm_item); list_del_init(&ci->i_snap_realm_item);
spin_unlock(&realm->inodes_with_caps_lock);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
ceph_queue_cap_snap(ci, ceph_queue_cap_snap(ci,