UBIFS: do not commit twice
VFS calls '->sync_fs()' twice - first time with @wait = 0, second
time with @wait = 1. As a result, we may commit and synchronize
write-buffers twice. Avoid doing this by returning immediatelly if
@wait = 0.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 89556ee..a7fc97f 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -432,18 +432,19 @@
int i, err;
struct ubifs_info *c = sb->s_fs_info;
struct writeback_control wbc = {
- .sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_NONE,
+ .sync_mode = WB_SYNC_ALL,
.range_start = 0,
.range_end = LLONG_MAX,
.nr_to_write = LONG_MAX,
};
/*
- * Note by akpm about WB_SYNC_NONE used above: zero @wait is just an
- * advisory thing to help the file system shove lots of data into the
- * queues. If some gets missed then it'll be picked up on the second
+ * Zero @wait is just an advisory thing to help the file system shove
+ * lots of data into the queues, and there will be the second
* '->sync_fs()' call, with non-zero @wait.
*/
+ if (!wait)
+ return 0;
if (sb->s_flags & MS_RDONLY)
return 0;