linux-ext4 - Re: [PATCH v6 12/20] fs: add a new fstype flag to indicate how writeback errors are tracked

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Message-ID: <20170615145724.GB14028@infradead.org>
Date:   Thu, 15 Jun 2017 07:57:24 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jeff Layton <jlayton@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...IV.linux.org.uk>, Jan Kara <jack@...e.cz>,
        tytso@....edu, axboe@...nel.dk, mawilcox@...rosoft.com,
        ross.zwisler@...ux.intel.com, corbet@....net,
        Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v6 12/20] fs: add a new fstype flag to indicate how
 writeback errors are tracked

On Thu, Jun 15, 2017 at 06:42:12AM -0400, Jeff Layton wrote:
> Correct.
> 
> But if there is a data writeback error, should we report an error on all
> open fds at that time (like we will for fsync)?

We should in theory, but I don't see how to properly do it.  In addition
sync_file_range just can't be used for data integrity to start with, so
I don't think it's worth it.  At some point we should add a proper
fsync_range syscall, though.