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Diffstat (limited to 'fs/btrfs/inode.c')
-rw-r--r--fs/btrfs/inode.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0fd7647c8932..c72033ee6017 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2166,16 +2166,23 @@ static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id,
if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr)
continue;
- extent_offset = btrfs_file_extent_offset(leaf, extent);
- if (key.offset - extent_offset != offset)
+ /*
+ * 'offset' refers to the exact key.offset,
+ * NOT the 'offset' field in btrfs_extent_data_ref, ie.
+ * (key.offset - extent_offset).
+ */
+ if (key.offset != offset)
continue;
+ extent_offset = btrfs_file_extent_offset(leaf, extent);
num_bytes = btrfs_file_extent_num_bytes(leaf, extent);
+
if (extent_offset >= old->extent_offset + old->offset +
old->len || extent_offset + num_bytes <=
old->extent_offset + old->offset)
continue;
+ ret = 0;
break;
}
@@ -2187,7 +2194,7 @@ static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id,
backref->root_id = root_id;
backref->inum = inum;
- backref->file_pos = offset + extent_offset;
+ backref->file_pos = offset;
backref->num_bytes = num_bytes;
backref->extent_offset = extent_offset;
backref->generation = btrfs_file_extent_generation(leaf, extent);
@@ -2210,7 +2217,8 @@ static noinline bool record_extent_backrefs(struct btrfs_path *path,
new->path = path;
list_for_each_entry_safe(old, tmp, &new->head, list) {
- ret = iterate_inodes_from_logical(old->bytenr, fs_info,
+ ret = iterate_inodes_from_logical(old->bytenr +
+ old->extent_offset, fs_info,
path, record_one_backref,
old);
BUG_ON(ret < 0 && ret != -ENOENT);