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| author | Sage Weil <sage@newdream.net> | 2010-03-09 23:52:26 +0300 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2010-03-21 07:33:07 +0300 |
| commit | 052bb34af3bf8ae2001b9f03d884ba0def3e427c (patch) | |
| tree | db8aecde5b43263d9f3a2947663cb55de4414545 | |
| parent | 978097c907b58a2d085bbf7632bee1a5a7e6f6ba (diff) | |
| download | linux-052bb34af3bf8ae2001b9f03d884ba0def3e427c.tar.xz | |
ceph: add missing locking to protect i_snap_realm_item during split
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>
| -rw-r--r-- | fs/ceph/snap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index bf2a5f3846a4..8a43bc8675eb 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -818,7 +818,9 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc, * queued (again) by ceph_update_snap_trace() * below. Queue it _now_, under the old context. */ + spin_lock(&realm->inodes_with_caps_lock); list_del_init(&ci->i_snap_realm_item); + spin_unlock(&realm->inodes_with_caps_lock); spin_unlock(&inode->i_lock); ceph_queue_cap_snap(ci, |