diff mbox

[4/4] change sb_writers to use percpu_rw_semaphore

Message ID 20150807195401.GA28529@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Oleg Nesterov Aug. 7, 2015, 7:54 p.m. UTC 
On 07/22, Oleg Nesterov wrote:
>
> +static void sb_freeze_unlock(struct super_block *sb)
> +{
> +	int level;
> +
> +	for (level = 0; level < SB_FREEZE_LEVELS; ++level)
> +		percpu_up_write(sb->s_writers.rw_sem + level);
>  }

OK, this is not exactly right, see the fix below.

Otherwise seems to work, but see another email I'll send in reply to 0/4.

Oleg.


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diff mbox

Patch

--- a/fs/super.c
+++ b/fs/super.c
@@ -1237,7 +1237,7 @@  static void sb_freeze_unlock(struct super_block *sb)
 {
 	int level;
 
-	for (level = 0; level < SB_FREEZE_LEVELS; ++level)
+	for (level = SB_FREEZE_LEVELS; --level >= 0; )
 		percpu_up_write(sb->s_writers.rw_sem + level);
 }