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authorSage Weil <sage@newdream.net>2010-08-24 08:44:16 -0700
committerSage Weil <sage@newdream.net>2010-08-24 16:24:18 -0700
commit7d8cb26d7dcb911f110b7762bd5941e8f009d6c3 (patch)
tree2adf2f6303cc96ff14c951dc6966f68a0fc3cf25 /fs/ceph/super.h
parent07a27e226d1ed210d2d4218bd0642b40f5405c6a (diff)
ceph: maintain i_head_snapc when any caps are dirty, not just for data
We used to use i_head_snapc to keep track of which snapc the current epoch of dirty data was dirtied under. It is used by queue_cap_snap to set up the cap_snap. However, since we queue cap snaps for any dirty caps, not just for dirty file data, we need to keep a valid i_head_snapc anytime we have dirty|flushing caps. This fixes a NULL pointer deref in queue_cap_snap when writing back dirty caps without data (e.g., snaptest-authwb.sh). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/super.h')
-rw-r--r--fs/ceph/super.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index b33929d8f287..c33897ae5725 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -344,7 +344,8 @@ struct ceph_inode_info {
unsigned i_cap_exporting_issued;
struct ceph_cap_reservation i_cap_migration_resv;
struct list_head i_cap_snaps; /* snapped state pending flush to mds */
- struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */
+ struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or
+ dirty|flushing caps */
unsigned i_snap_caps; /* cap bits for snapped files */
int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */