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btrfs: set the correct lockdep class for new nodes 

commit ad24466588 upstream.

When flipping over to the rw_semaphore I noticed I'd get a lockdep splat
in replace_path(), which is weird because we're swapping the reloc root
with the actual target root.  Turns out this is because we're using the
root->root_key.objectid as the root id for the newly allocated tree
block when setting the lockdep class, however we need to be using the
actual owner of this new block, which is saved in owner.

The affected path is through btrfs_copy_root as all other callers of
btrfs_alloc_tree_block (which calls init_new_buffer) have root_objectid
== root->root_key.objectid .

CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josef Bacik 2020-08-10 11:42:30 -04:00 committed by Greg Kroah-Hartman
parent c37cc199da
commit 7e0ffb0d9d
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent-tree.c
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@ -4446,7 +4446,7 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
return ERR_PTR(-EUCLEAN);
}
btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
btrfs_set_buffer_lockdep_class(owner, buf, level);
btrfs_tree_lock(buf);
btrfs_clean_tree_block(buf);
clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);