Btrfs: return value of btrfs_read_buffer is checked correctly
btrfs_read_buffer() has the possibility of returning the error.
Therefore, I add the code in which the return value of btrfs_read_buffer()
is checked.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index eb1ae90..6f22a4f 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1628,7 +1628,9 @@
int i;
int ret;
- btrfs_read_buffer(eb, gen);
+ ret = btrfs_read_buffer(eb, gen);
+ if (ret)
+ return ret;
level = btrfs_header_level(eb);
@@ -1749,7 +1751,11 @@
path->slots[*level]++;
if (wc->free) {
- btrfs_read_buffer(next, ptr_gen);
+ ret = btrfs_read_buffer(next, ptr_gen);
+ if (ret) {
+ free_extent_buffer(next);
+ return ret;
+ }
btrfs_tree_lock(next);
btrfs_set_lock_blocking(next);
@@ -1766,7 +1772,11 @@
free_extent_buffer(next);
continue;
}
- btrfs_read_buffer(next, ptr_gen);
+ ret = btrfs_read_buffer(next, ptr_gen);
+ if (ret) {
+ free_extent_buffer(next);
+ return ret;
+ }
WARN_ON(*level <= 0);
if (path->nodes[*level-1])