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authorMiao Xie <miaox@cn.fujitsu.com>2011-11-10 20:45:04 -0500
committerChris Mason <chris.mason@oracle.com>2011-11-10 20:45:04 -0500
commit924cd8fbe41851eda2b68bf2ed501b2777fd77b4 (patch)
treec31afbc9ba7dbc27eea43a0319a64732d180a3d2
parentf7d572188b7b2a6d07081688f8602dc407186e64 (diff)
Btrfs: fix nocow when deleting the item
btrfs_previous_item() just search the b+ tree, do not COW the nodes or leaves, if we modify the result of it, the meta-data will be broken. fix it. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/volumes.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f8e2943101a1..c37433d3cd82 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -999,7 +999,7 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
key.objectid = device->devid;
key.offset = start;
key.type = BTRFS_DEV_EXTENT_KEY;
-
+again:
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0) {
ret = btrfs_previous_item(root, path, key.objectid,
@@ -1012,6 +1012,9 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_dev_extent);
BUG_ON(found_key.offset > start || found_key.offset +
btrfs_dev_extent_length(leaf, extent) < start);
+ key = found_key;
+ btrfs_release_path(path);
+ goto again;
} else if (ret == 0) {
leaf = path->nodes[0];
extent = btrfs_item_ptr(leaf, path->slots[0],