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15 Apr 2022 01:16:26 -0700 IronPort-SDR: Y0ZiPxHabn85gfo/aeiShpy3r/UcGQIscqpa2oX4+PVFekI7204Ci07clWaOktW8nsPsfNlVJp /E1MCLltHfQATPpF1Mv5YT1xWvphHN+JTnkKWvg/HXLTnjYh9DUFsfzosR96/nAnOxENaFF19r /W5qpMwhf19OiWDIP0YQVPUB7PaSk1Qq8sDrA5o/Oas2Q51SrMiaZpdULQ1urgfgQ/YL0xlh2s mFXlvLU3m7K5Nsp3DDWBjjhHFV7ElXhkniRecE/ai/ehGc9Q8HU3mdZLoKuXQ7ymX2y9IwNpQF kI0= WDCIronportException: Internal Received: from shindev.dhcp.fujisawa.hgst.com (HELO shindev.fujisawa.hgst.com) ([10.149.52.173]) by uls-op-cesaip02.wdc.com with ESMTP; 15 Apr 2022 01:45:14 -0700 From: Shin'ichiro Kawasaki To: dm-devel@redhat.com, Mike Snitzer Date: Fri, 15 Apr 2022 17:45:13 +0900 Message-Id: <20220415084513.790722-1-shinichiro.kawasaki@wdc.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 X-Mailman-Approved-At: Tue, 19 Apr 2022 06:10:27 +0000 Subject: [dm-devel] [PATCH] dm: fix bio length of empty flush X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Shin'ichiro Kawasaki , Damien Le Moal , Christoph Hellwig Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com The commit 92986f6b4c8a ("dm: use bio_clone_fast in alloc_io/alloc_tio") removed bio_clone_fast() call from alloc_tio() when ci->io->tio is available. In this case, ci->bio is not copied to ci->io->tio.clone. This is fine since init_clone_info() sets same values to ci->bio and ci->io->tio.clone. However, when incoming bios have REQ_PREFLUSH flag, __send_empty_flush() prepares a zero length bio on stack and set it to ci->bio. At this time, ci->io->tio.clone still keeps non-zero length. When alloc_tio() chooses this ci->io->tio.clone as the bio to map, it is passed to targets as non-empty flush bio. It causes bio length check failure in dm-zoned and unexpected operation such as dm_accept_partial_bio() call. To avoid the non-empty flush bio, set zero length to ci->io->tio.clone in __send_empty_flush(). Fixes: 92986f6b4c8a ("dm: use bio_clone_fast in alloc_io/alloc_tio") Signed-off-by: Shin'ichiro Kawasaki --- drivers/md/dm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 3c5fad7c4ee6..f2397546b93f 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1392,6 +1392,7 @@ static void __send_empty_flush(struct clone_info *ci) ci->bio = &flush_bio; ci->sector_count = 0; + ci->io->tio.clone.bi_iter.bi_size = 0; while ((ti = dm_table_get_target(ci->map, target_nr++))) __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL);