Commit 819ec6b9 authored Jul 06, 2017 by Jeff Layton

dax: set errors in mapping when writeback fails



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>

parent acbf3c34

fs/dax.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -856,10 +856,12 @@ 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:
		put_dax(dax_dev);
		trace_dax_writeback_range_done(inode, start_index, end_index);

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