From d638108484d186bf97a838d037f165d9b404e6ee Mon Sep 17 00:00:00 2001 From: Jan Schmidt Date: Tue, 23 Oct 2012 14:21:05 +0200 Subject: 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: Jan Schmidt --- fs/btrfs/ctree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index ef68c33eefd..f6739903d07 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -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; -- cgit v1.2.3-70-g09d2