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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>
This commit is contained in:
Jan Schmidt 2012-10-23 14:21:05 +02:00
parent 5b6602e762
commit d638108484
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ctree.c
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@ -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;