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SubjectRe: [PATCH] fs-writeback: handle errors in sync_sb_inodes()
On Wed, 28 May 2008 18:43:13 +1000 Dave Chinner <david@fromorbit.com> wrote:

> On Wed, May 28, 2008 at 01:35:49AM -0700, Andrew Morton wrote:
> > On Wed, 28 May 2008 18:25:50 +1000 Dave Chinner <david@fromorbit.com> wrote:
> > > 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@gmail.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....
> >
> > OIC. This, I guess...
> >
> > --- a/fs/fs-writeback.c~fs-writeback-handle-errors-in-sync_sb_inodes-fix
> > +++ a/fs/fs-writeback.c
> > @@ -500,7 +500,8 @@ void generic_sync_sb_inodes(struct super
> > __iget(inode);
> > pages_skipped = wbc->pages_skipped;
> > err = __writeback_single_inode(inode, wbc);
> > - mapping_set_error(mapping, err);
> > + if (err == -EIO || err == -ENOSPC) /* xfs can return -EAGAIN */
> > + mapping_set_error(mapping, err);
>
> Rapidly gets messy. XFS can also return at least EDQUOT and EUCLEAN
> (i.e. EFSCORRUPTED) from here as well, and it's likely that there's
> other real errors I can't think of right now as well.
>

argh. Who said it was allowed to do that :(

Give up. We (ie: I) need to fix this one properly.


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