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From: jlayton@kernel.org
To: Andrew Morton <akpm@linux-foundation.org>,
	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,
	Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>,
	David Sterba <dsterba@suse.com>,
	"Darrick J . Wong" <darrick.wong@oracle.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>,
	Eryu Guan <eguan@redhat.com>, David Howells <dhowells@redhat.com>,
	Christoph Hellwig <hch@infradead.org>,
	Liu Bo <bo.li.liu@oracle.com>,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-btrfs@vger.kernel.org, linux-block@vger.kernel.org
Subject: [PATCH v8 13/18] dax: set errors in mapping when writeback fails
Date: Thu, 29 Jun 2017 09:19:49 -0400
Message-ID: <20170629131954.28733-14-jlayton@kernel.org> (raw)
In-Reply-To: <20170629131954.28733-1-jlayton@kernel.org>

From: Jeff Layton <jlayton@redhat.com>

Jan Kara's description for this patch is much better than mine, so I'm
quoting it verbatim here:

DAX currently doesn't set errors in the mapping when cache flushing
fails in dax_writeback_mapping_range(). Since this function can get
called only from fsync(2) or sync(2), this is actually as good as it can
currently get since we correctly propagate the error up from
dax_writeback_mapping_range() to filemap_fdatawrite()

However, in the future better writeback error handling will enable us to
properly report these errors on fsync(2) even if there are multiple file
descriptors open against the file or if sync(2) gets called before
fsync(2). So convert DAX to using standard error reporting through the
mapping.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-and-tested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---
 fs/dax.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index c22eaf162f95..441280e15d5b 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -856,8 +856,10 @@ int dax_writeback_mapping_range(struct address_space *mapping,
 
 			ret = dax_writeback_one(bdev, dax_dev, mapping,
 					indices[i], pvec.pages[i]);
-			if (ret < 0)
+			if (ret < 0) {
+				mapping_set_error(mapping, ret);
 				goto out;
+			}
 		}
 	}
 out:
-- 
2.13.0

  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-29 13:19 [PATCH v8 00/18] fs: enhanced writeback error reporting with errseq_t (pile #1) jlayton
2017-06-29 13:19 ` [PATCH v8 01/18] fs: remove call_fsync helper function jlayton
2017-06-29 13:19 ` [PATCH v8 02/18] buffer: use mapping_set_error instead of setting the flag jlayton
2017-06-29 13:19 ` [PATCH v8 03/18] fs: check for writeback errors after syncing out buffers in generic_file_fsync jlayton
2017-06-29 14:19   ` Christoph Hellwig
2017-06-29 20:17     ` Jeff Layton
2017-06-29 13:19 ` [PATCH v8 04/18] buffer: set errors in mapping at the time that the error occurs jlayton
2017-06-29 13:19 ` [PATCH v8 05/18] jbd2: don't clear and reset errors after waiting on writeback jlayton
2017-06-29 13:19 ` [PATCH v8 06/18] mm: clear AS_EIO/AS_ENOSPC when writeback initiation fails jlayton
2017-06-29 13:19 ` [PATCH v8 07/18] mm: don't TestClearPageError in __filemap_fdatawait_range jlayton
2017-06-29 13:19 ` [PATCH v8 08/18] mm: clean up error handling in write_one_page jlayton
2017-06-29 13:19 ` [PATCH v8 09/18] lib: add errseq_t type and infrastructure for handling it jlayton
2017-06-29 13:19 ` [PATCH v8 10/18] fs: new infrastructure for writeback error handling and reporting jlayton
2017-06-29 13:45   ` Jeff Layton
2017-06-29 17:52   ` Jeff Layton
2017-06-29 13:19 ` [PATCH v8 11/18] mm: set both AS_EIO/AS_ENOSPC and errseq_t in mapping_set_error jlayton
2017-06-29 13:19 ` [PATCH v8 12/18] Documentation: flesh out the section in vfs.txt on storing and reporting writeback errors jlayton
2017-06-29 17:11   ` Darrick J. Wong
2017-06-29 18:13     ` Jeff Layton
2017-06-29 18:21       ` Matthew Wilcox
2017-06-29 20:42         ` Jeff Layton
2017-06-29 13:19 ` jlayton [this message]
2017-06-29 13:19 ` [PATCH v8 14/18] block: convert to errseq_t based writeback error tracking jlayton
2017-06-29 14:18   ` Christoph Hellwig
2017-06-29 13:19 ` [PATCH v8 15/18] fs: convert __generic_file_fsync to use errseq_t based reporting jlayton
2017-06-29 13:19 ` [PATCH v8 16/18] ext4: use errseq_t based error handling for reporting data writeback errors jlayton
2017-06-29 14:12   ` Christoph Hellwig
2017-06-29 20:26     ` Jeff Layton
2017-06-29 13:19 ` [PATCH v8 17/18] xfs: minimal conversion to errseq_t writeback error reporting jlayton
2017-06-29 14:12   ` Christoph Hellwig
2017-06-30 16:45     ` Jeff Layton
2017-06-30 16:49       ` Christoph Hellwig
2017-06-29 17:13   ` Darrick J. Wong
2017-06-29 13:19 ` [PATCH v8 18/18] btrfs: minimal conversion to errseq_t writeback error reporting on fsync jlayton
2017-06-29 14:17   ` Christoph Hellwig
2017-06-29 20:32     ` Jeff Layton

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