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authorJan Schmidt <list.btrfs@jan-o-sch.net>2012-10-23 14:21:05 +0200
committerJan Schmidt <list.btrfs@jan-o-sch.net>2012-10-24 12:36:39 +0200
commitd638108484d186bf97a838d037f165d9b404e6ee (patch)
tree4fb20d045666fc7228fe8a149172eec07595b240
parent5b6602e762cae17c8891d19698afea451e9c1d95 (diff)
downloadlinux-d638108484d186bf97a838d037f165d9b404e6ee.tar.bz2
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 <list.btrfs@jan-o-sch.net>
-rw-r--r--fs/btrfs/ctree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index ef68c33eefd9..f6739903d072 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;