From: Andrew Morton <akpm@linux-foundation.org>
To: Jeff Layton <jlayton@redhat.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>, Jan Kara <jack@suse.cz>,
tytso@mit.edu, axboe@kernel.dk, mawilcox@microsoft.com,
ross.zwisler@linux.intel.com, corbet@lwn.net,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v5 00/17] fs: introduce new writeback error reporting and convert ext2 and ext4 to use it
Date: Wed, 31 May 2017 14:37:13 -0700 [thread overview]
Message-ID: <20170531143713.95796a8bce699d263b764763@linux-foundation.org> (raw)
In-Reply-To: <1496266309.2984.13.camel@redhat.com>
On Wed, 31 May 2017 17:31:49 -0400 Jeff Layton <jlayton@redhat.com> wrote:
> On Wed, 2017-05-31 at 13:27 -0700, Andrew Morton wrote:
> > On Wed, 31 May 2017 08:45:23 -0400 Jeff Layton <jlayton@redhat.com> wrote:
> >
> > > This is v5 of the patchset to improve how we're tracking and reporting
> > > errors that occur during pagecache writeback.
> >
> > I'm curious to know how you've been testing this?
>
> > Is that testing
> > strong enough for us to be confident that all nature of I/O errors
> > will be reported to userspace?
> >
>
> That's a tall order. This is a difficult thing to test as these sorts of
> errors are pretty rare by nature.
>
> I have an xfstest that I posted just after this set that demonstrates
> that it works correctly, at least on ext2/3/4 when run by the ext4
> driver (ext2 legacy driver reports too many errors currently). I had
> btrfs and xfs working on that test too in an earlier incarnation of this
> set, so I think we can fix this in them as well without too much
> difficulty.
>
> I'm happy to run other tests if someone wants to suggest them.
>
> Now, all that said, I don't think this will make things any worse than
> they are today as far as reporting errors properly to userland goes.
> It's rather easy for an incidental synchronous writeback request from an
> internal caller to clear the AS_* flags today. This will at least ensure
> that we're reporting errors since a well-defined point in time when you
> call fsync.
Were you using error injection of some form? If so, how was that all
set up?
next prev parent reply other threads:[~2017-05-31 21:37 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-31 12:45 [PATCH v5 00/17] fs: introduce new writeback error reporting and convert ext2 and ext4 to use it Jeff Layton
2017-05-31 12:45 ` [PATCH v5 01/17] lib: add errseq_t type and infrastructure for handling it Jeff Layton
2017-05-31 12:45 ` [PATCH v5 02/17] fs: new infrastructure for writeback error handling and reporting Jeff Layton
2017-05-31 12:45 ` [PATCH v5 03/17] mm: tracepoints for writeback error events Jeff Layton
2017-05-31 12:45 ` [PATCH v5 04/17] fs: add a new fstype flag to indicate how writeback errors are tracked Jeff Layton
2017-05-31 12:45 ` [PATCH v5 05/17] Documentation: flesh out the section in vfs.txt on storing and reporting writeback errors Jeff Layton
2017-05-31 12:45 ` [PATCH v5 06/17] fs: adapt sync_file_range to new reporting infrastructure Jeff Layton
2017-05-31 12:45 ` [PATCH v5 07/17] mm: add filemap_fdatawait_range_since and filemap_write_and_wait_range_since Jeff Layton
2017-05-31 12:45 ` [PATCH v5 08/17] dax: set errors in mapping when writeback fails Jeff Layton
2017-06-06 1:01 ` Ross Zwisler
2017-06-06 1:08 ` Jeff Layton
2017-05-31 12:45 ` [PATCH v5 09/17] block: convert to errseq_t based writeback error tracking Jeff Layton
2017-05-31 12:45 ` [PATCH v5 10/17] block: add sync_blockdev_since and sync_filesystem_since Jeff Layton
2017-05-31 12:45 ` [PATCH v5 11/17] fs: add f_md_wb_err field to struct file for tracking metadata errors Jeff Layton
2017-05-31 12:45 ` [PATCH v5 12/17] fs: allow __generic_file_fsync to support both flavors of error reporting Jeff Layton
2017-05-31 12:45 ` [PATCH v5 13/17] jbd2: conditionally handle errors using errseq_t based on FS_WB_ERRSEQ flag Jeff Layton
2017-05-31 12:45 ` [PATCH v5 14/17] ext4: convert to errseq_t based error tracking Jeff Layton
2017-05-31 12:45 ` [PATCH v5 15/17] fs: add a write_one_page_since Jeff Layton
2017-05-31 12:45 ` [PATCH v5 16/17] ext2: convert to errseq_t based writeback error tracking Jeff Layton
2017-05-31 12:45 ` [PATCH v5 17/17] fs: convert ext2 to use write_one_page_since Jeff Layton
2017-05-31 20:27 ` [PATCH v5 00/17] fs: introduce new writeback error reporting and convert ext2 and ext4 to use it Andrew Morton
2017-05-31 21:31 ` Jeff Layton
2017-05-31 21:37 ` Andrew Morton [this message]
2017-05-31 22:01 ` Jeff Layton
2017-06-02 5:25 ` Ross Zwisler
2017-06-02 10:07 ` Jeff Layton
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