Commit d6381084 authored by Jan Schmidt's avatar Jan Schmidt
Browse files

Btrfs: fix extent buffer reference for tree mod log roots 



In get_old_root we grab a lock on the extent buffer before we obtain a
reference on that buffer. That order is changed now.

Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
parent 5b6602e7

fs/btrfs/ctree.c

+1 −1
Original line number Diff line number Diff line
@@ -1279,6 +1279,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq) 


	if (!eb)

		return NULL;

	extent_buffer_get(eb);

	btrfs_tree_read_lock(eb);

	if (old_root) {

		btrfs_set_header_bytenr(eb, eb->start);
@@ -1291,7 +1292,6 @@ get_old_root(struct btrfs_root *root, u64 time_seq) 
		__tree_mod_log_rewind(eb, time_seq, tm);

	else

		WARN_ON(btrfs_header_level(eb) != 0);

	extent_buffer_get(eb);

	WARN_ON(btrfs_header_nritems(eb) > BTRFS_NODEPTRS_PER_BLOCK(root));



	return eb;