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authorLiu Bo <liubo2009@cn.fujitsu.com>2011-11-14 20:48:06 -0500
committerChris Mason <chris.mason@oracle.com>2011-11-15 09:53:28 -0500
commitf1ebcc74d5b2159f44c96b479b6eb8afc7829095 (patch)
tree83d949e151f2f7e4a980396538cc0f2356bacfd4 /fs/btrfs/ctree.h
parent8965593e41dd2d0e2a2f1e6f245336005ea94a2c (diff)
Btrfs: fix tree corruption after multi-thread snapshots and inode_cache flush
The btrfs snapshotting code requires that once a root has been snapshotted, we don't change it during a commit. But there are two cases to lead to tree corruptions: 1) multi-thread snapshots can commit serveral snapshots in a transaction, and this may change the src root when processing the following pending snapshots, which lead to the former snapshots corruptions; 2) the free inode cache was changing the roots when it root the cache, which lead to corruptions. This fixes things by making sure we force COW the block after we create a snapshot during commiting a transaction, then any changes to the roots will result in COW, and we get all the fs roots and snapshot roots to be consistent. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b9ba59ff9292..b1cb3c052484 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1271,6 +1271,8 @@ struct btrfs_root {
1271 * for stat. It may be used for more later 1271 * for stat. It may be used for more later
1272 */ 1272 */
1273 dev_t anon_dev; 1273 dev_t anon_dev;
1274
1275 int force_cow;
1274}; 1276};
1275 1277
1276struct btrfs_ioctl_defrag_range_args { 1278struct btrfs_ioctl_defrag_range_args {