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OpenCloudOS-Kernel
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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>
This commit is contained in:
Artem Bityutskiy 2009-01-09 21:02:37 +02:00
parent 1de9e8e70f
commit dedb0d48a9
1 changed files with 5 additions and 4 deletions
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9
fs/ubifs/super.c
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@ -432,18 +432,19 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
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;