linux-kernel - Re: [PATCH] ext3: wait on all pending commits in ext3_sync

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Message-ID: <20081103201428.GB30565@ajones-laptop.nbttech.com>
Date:	Mon, 3 Nov 2008 12:14:28 -0800
From:	Arthur Jones <ajones@...erbed.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"sandeen@...hat.com" <sandeen@...hat.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"sct@...hat.com" <sct@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ext3: wait on all pending commits in ext3_sync_fs

Hi Andrew, ...

On Mon, Nov 03, 2008 at 11:33:18AM -0800, Andrew Morton wrote:
> [...]
> > --- a/fs/ext3/super.c
> > +++ b/fs/ext3/super.c
> > @@ -2392,7 +2392,13 @@ static int ext3_sync_fs(struct super_block *sb, int wait)
> >       if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
> >               if (wait)
> >                       log_wait_commit(EXT3_SB(sb)->s_journal, target);
> > -     }
> > +     } else if (wait)
> > +             /*
> > +              * We may have a commit in progress, clear it out
> > +              * before we go on...
> > +              */
> > +             ext3_force_commit(sb);
> > +
> >       return 0;
> >  }
> 
> Can we do
> 
>         sb->s_dirt = 0;
>         if (wait)
>                 ext3_force_commit(...);
>         else
>                 journal_start_commit(...);

I think this is what you had in mind:


diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 18eaa78..2b48b85 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2386,13 +2386,12 @@ static void ext3_write_super (struct super_block * sb)
 
 static int ext3_sync_fs(struct super_block *sb, int wait)
 {
-	tid_t target;
-
 	sb->s_dirt = 0;
-	if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
-		if (wait)
-			log_wait_commit(EXT3_SB(sb)->s_journal, target);
-	}
+	if (wait)
+		ext3_force_commit(sb);
+	else
+		journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
+
 	return 0;
 }
 
I tried this and it too fixes the problem.  FWIW I agree it
looks better...

Tested-by: Arthur Jones <ajones@...erbed.com>

Arthur
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