linux-kernel - Re: [PATCH] fs-writeback: handle errors in sync_sb

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Message-ID: <20080528082550.GD3819@disturbed>
Date:	Wed, 28 May 2008 18:25:50 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Guillaume Chazarain <guichaz@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs-writeback: handle errors in sync_sb_inodes()

On Tue, May 27, 2008 at 10:38:32PM -0700, Andrew Morton wrote:
> On Fri, 23 May 2008 22:34:29 +0200 Guillaume Chazarain <guichaz@...il.com> wrote:
> > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> > index 495214d..0e6881e 100644
> > --- a/fs/fs-writeback.c
> > +++ b/fs/fs-writeback.c
> > @@ -454,6 +454,7 @@ void generic_sync_sb_inodes(struct super_block *sb,
> >  		struct address_space *mapping = inode->i_mapping;
> >  		struct backing_dev_info *bdi = mapping->backing_dev_info;
> >  		long pages_skipped;
> > +		int err;
> >  
> >  		if (!bdi_cap_writeback_dirty(bdi)) {
> >  			redirty_tail(inode);
> > @@ -498,7 +499,8 @@ void generic_sync_sb_inodes(struct super_block *sb,
> >  		BUG_ON(inode->i_state & I_FREEING);
> >  		__iget(inode);
> >  		pages_skipped = wbc->pages_skipped;
> > -		__writeback_single_inode(inode, wbc);
> > +		err = __writeback_single_inode(inode, wbc);
> > +		mapping_set_error(mapping, err);
> >  		if (wbc->sync_mode == WB_SYNC_HOLD) {
> >  			inode->dirtied_when = jiffies;
> >  			list_move(&inode->i_list, &sb->s_dirty);
> 
> ho hum, I've forgotten why I didn't like this.  Let's give it a run.

IIRC, it'll produce lots of spurious EIO errors under writeback on
XFS as XFS will return EAGAIN if we've been asked for a non-blocking
flush and we would have blocked....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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