From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ross Zwisler Subject: [PATCH] dax: fix regression in dax_writeback_mapping_range() Date: Tue, 14 Mar 2017 15:53:58 -0600 Message-ID: <20170314215358.31451-1-ross.zwisler@linux.intel.com> References: <20170314025642.nwpf7zxbc6655gum@XZHOUW.usersys.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170314025642.nwpf7zxbc6655gum-E9dkjZ7ERC1QcClZ3XN9yxcY2uh10dtjAL8bYrjMMd8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Andrew Morton , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Jan Kara , "Darrick J. Wong" , Matthew Wilcox , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-next-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alexander Viro , linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Christoph Hellwig List-Id: linux-next.vger.kernel.org commit 354ae7432ee8 ("dax: add tracepoints to dax_writeback_mapping_range()") in the -next tree, which appears in next-20170310, inadvertently changed dax_writeback_mapping_range() so that it could end up returning a positive value: the number of bytes flushed, as returned by dax_writeback_one(). This was incorrect. This function either needs to return a negative error value, or zero on success. This change was causing xfstest failures, as reported by Xiong: https://lkml.org/lkml/2017/3/13/1220 With this fix applied to next-20170310, all the test failures reported by Xiong (generic/075 generic/112 generic/127 generic/231 generic/263) are resolved. Reported-by: Xiong Zhou Signed-off-by: Ross Zwisler --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 1861ef0..60688c7 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -907,7 +907,7 @@ int dax_writeback_mapping_range(struct address_space *mapping, } out: trace_dax_writeback_range_done(inode, start_index, end_index); - return ret; + return (ret < 0 ? ret : 0); } EXPORT_SYMBOL_GPL(dax_writeback_mapping_range); -- 2.9.3