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Check duplicate backrefs for both data and metadata 

lookup_inline_extent_backref only checks for duplicate backref for data extent.
It assumes backrefs for tree block never conflict.  This patch makes
lookup_inline_extent_backref check duplicate backrefs for both data and tree
block, so that we can detect potential bug earlier.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
master
Yan Zheng 2009-06-11 09:27:31 -04:00 committed by Chris Mason
parent 0030f1d3ae
commit 0e3c5d410f
1 changed files with 2 additions and 8 deletions
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10
extent-tree.c
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@ -1061,12 +1061,6 @@ static int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
#endif
BUG_ON(item_size < sizeof(*ei));
if (owner < BTRFS_FIRST_FREE_OBJECTID && insert &&
item_size + extra_size >= BTRFS_MAX_EXTENT_ITEM_SIZE(root)) {
err = -EAGAIN;
goto out;
}
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
flags = btrfs_extent_flags(leaf, ei);
@ -1139,8 +1133,8 @@ static int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
* For simplicity, we just do not add new inline back
* ref if there is any back ref item.
*/
if (owner >= BTRFS_FIRST_FREE_OBJECTID &&
find_next_key(path, &key) == 0 && key.objectid == bytenr) {
if (find_next_key(path, &key) == 0 && key.objectid == bytenr &&
key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) {
err = -EAGAIN;
goto out;
}