@@ -2227,6 +2227,13 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
return ret;
+ if (ret == 0) {
+ /*
+ * Key with offset -1 found, there would have to exist an extent
+ * item with such offset, but this is out of the valid range.
+ */
+ return -EUCLEAN;
+ }
ret = btrfs_previous_extent_item(extent_root, path, 0);
if (ret) {
@@ -2870,6 +2877,10 @@ int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr)
if (ret < 0)
return ret;
if (ret == 0) {
+ /*
+ * Key with offset -1 found, there would have to exist an extent
+ * item with such offset, but this is out of the valid range.
+ */
ret = -EUCLEAN;
goto release;
}
The extent_from_logical() helper looks up an extent item by a key, allowing to do an inexact search when key->offset is -1. It's never expected to find such item, as it would break the allowed range of a extent item offset. The same error is already handled in btrfs_backref_iter_start() so add a comment for consistency. Signed-off-by: David Sterba <dsterba@suse.com> --- fs/btrfs/backref.c | 11 +++++++++++ 1 file changed, 11 insertions(+)