linux-ext4 - Re: [PATCH v4 14/27] fs: new infrastructure for writeback error handling and reporting

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Date:   Wed, 10 May 2017 15:46:36 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jeff Layton <jlayton@...hat.com>
Cc:     Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-cifs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-mm@...ck.org,
        jfs-discussion@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        cluster-devel@...hat.com, linux-f2fs-devel@...ts.sourceforge.net,
        v9fs-developer@...ts.sourceforge.net, linux-nilfs@...r.kernel.org,
        linux-block@...r.kernel.org, dhowells@...hat.com,
        akpm@...ux-foundation.org, hch@...radead.org,
        ross.zwisler@...ux.intel.com, mawilcox@...rosoft.com,
        jack@...e.com, viro@...iv.linux.org.uk, corbet@....net,
        neilb@...e.de, clm@...com, tytso@....edu, axboe@...nel.dk,
        josef@...icpanda.com, hubcap@...ibond.com, rpeterso@...hat.com,
        bo.li.liu@...cle.com
Subject: Re: [PATCH v4 14/27] fs: new infrastructure for writeback error
 handling and reporting

On Wed 10-05-17 08:19:50, Jeff Layton wrote:
> On Wed, 2017-05-10 at 13:48 +0200, Jan Kara wrote:
> > On Tue 09-05-17 11:49:17, Jeff Layton wrote:
> > > diff --git a/fs/file_table.c b/fs/file_table.c
> > > index 954d510b765a..d6138b6411ff 100644
> > > --- a/fs/file_table.c
> > > +++ b/fs/file_table.c
> > > @@ -168,6 +168,7 @@ struct file *alloc_file(const struct path *path, fmode_t mode,
> > >  	file->f_path = *path;
> > >  	file->f_inode = path->dentry->d_inode;
> > >  	file->f_mapping = path->dentry->d_inode->i_mapping;
> > > +	file->f_wb_err = filemap_sample_wb_error(file->f_mapping);
> > 
> > Why do you sample here when you also sample in do_dentry_open()? I didn't
> > find any alloc_file() callers that would possibly care about writeback
> > errors... 
> > 
> > 								Honza
> 
> I basically used the setting of f_mapping as a guideline as to where to
> sample it for initialization. My thinking was that if f_mapping ever
> ended up different then you'd probably also want f_wb_err to be
> resampled anyway.

OK, makes sense.

> I can drop this hunk if you think we don't need it.

I don't really care. I was just wondering whether I'm missing something...

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR