btrfs-progs: check: introduce function to query tree block level

Introduce function query_tree_block_level() to resolve tree block level
by the following method:
1) tree block backref level
2) tree block header level

And only when header level == backref level, and transid matches, it will
return the tree block level.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/cmds-check.c b/cmds-check.c
index 84890f3..8c2ff3f 100644 (file)
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -8860,6 +8860,82 @@ error:
        return err;
 }
 
+/*
+ * Get real tree block level for the case like shared block
+ * Return >= 0 as tree level
+ * Return <0 for error
+ */
+static int query_tree_block_level(struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+       struct extent_buffer *eb;
+       struct btrfs_path path;
+       struct btrfs_key key;
+       struct btrfs_extent_item *ei;
+       u64 flags;
+       u64 transid;
+       u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
+       u8 backref_level;
+       u8 header_level;
+       int ret;
+
+       /* Search extent tree for extent generation and level */
+       key.objectid = bytenr;
+       key.type = BTRFS_METADATA_ITEM_KEY;
+       key.offset = (u64)-1;
+
+       btrfs_init_path(&path);
+       ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, &path, 0, 0);
+       if (ret < 0)
+               goto release_out;
+       ret = btrfs_previous_extent_item(fs_info->extent_root, &path, bytenr);
+       if (ret < 0)
+               goto release_out;
+       if (ret > 0) {
+               ret = -ENOENT;
+               goto release_out;
+       }
+
+       btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+       ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
+                           struct btrfs_extent_item);
+       flags = btrfs_extent_flags(path.nodes[0], ei);
+       if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
+               ret = -ENOENT;
+               goto release_out;
+       }
+
+       /* Get transid for later read_tree_block() check */
+       transid = btrfs_extent_generation(path.nodes[0], ei);
+
+       /* Get backref level as one source */
+       if (key.type == BTRFS_METADATA_ITEM_KEY) {
+               backref_level = key.offset;
+       } else {
+               struct btrfs_tree_block_info *info;
+
+               info = (struct btrfs_tree_block_info *)(ei + 1);
+               backref_level = btrfs_tree_block_level(path.nodes[0], info);
+       }
+       btrfs_release_path(&path);
+
+       /* Get level from tree block as an alternative source */
+       eb = read_tree_block_fs_info(fs_info, bytenr, nodesize, transid);
+       if (!extent_buffer_uptodate(eb)) {
+               free_extent_buffer(eb);
+               return -EIO;
+       }
+       header_level = btrfs_header_level(eb);
+       free_extent_buffer(eb);
+
+       if (header_level != backref_level)
+               return -EIO;
+       return header_level;
+
+release_out:
+       btrfs_release_path(&path);
+       return ret;
+}
+
 static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root, int overwrite)
 {