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Wed, 03 Aug 2016 17:30:50 -0700 (PDT) X-Received: by 10.37.208.74 with SMTP id h71mr6092000ybg.146.1470270650131; Wed, 03 Aug 2016 17:30:50 -0700 (PDT) MIME-Version: 1.0 Received: by 10.129.132.199 with HTTP; Wed, 3 Aug 2016 17:30:29 -0700 (PDT) In-Reply-To: <87fbe31f-27b3-ff7a-e381-34fc1aad337e@redhat.com> References: <1465155145-10812-1-git-send-email-mchristi@redhat.com> <1465155145-10812-38-git-send-email-mchristi@redhat.com> <87fbe31f-27b3-ff7a-e381-34fc1aad337e@redhat.com> From: Shaun Tancheff Date: Wed, 3 Aug 2016 19:30:29 -0500 Message-ID: Subject: Re: [PATCH 37/45] drivers: use req op accessor To: Mike Christie Cc: Ross Zwisler , Ross Zwisler , Dave Chinner , Jens Axboe , linux-f2fs-devel@lists.sourceforge.net, linux-ext4 , konrad.wilk@oracle.com, drbd-dev@lists.linbit.com, philipp.reisner@linbit.com, lars.ellenberg@linbit.com, linux-raid@vger.kernel.org, dm-devel@redhat.com, linux-fsdevel , linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, LKML , linux-scsi@vger.kernel.org, linux-mtd@lists.infradead.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, osd-dev@open-osd.org, XFS Developers , ocfs2-devel@oss.oracle.com X-Proofpoint-PolicyRoute: Outbound X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-08-03_16:, , signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1608040003 X-Proofpoint-Spam-Policy: Default Domain Policy Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Wed, Aug 3, 2016 at 6:47 PM, Mike Christie wrote: > On 08/03/2016 05:33 PM, Ross Zwisler wrote: >> On Sun, Jun 5, 2016 at 1:32 PM, wrote: >>> From: Mike Christie >>> >>> The req operation REQ_OP is separated from the rq_flag_bits >>> definition. This converts the block layer drivers to >>> use req_op to get the op from the request struct. >>> >>> Signed-off-by: Mike Christie >>> --- >>> drivers/block/loop.c | 6 +++--- >>> drivers/block/mtip32xx/mtip32xx.c | 2 +- >>> drivers/block/nbd.c | 2 +- >>> drivers/block/rbd.c | 4 ++-- >>> drivers/block/xen-blkfront.c | 8 +++++--- >>> drivers/ide/ide-floppy.c | 2 +- >>> drivers/md/dm.c | 2 +- >>> drivers/mmc/card/block.c | 7 +++---- >>> drivers/mmc/card/queue.c | 6 ++---- >> >> Dave Chinner reported a deadlock with XFS + DAX, which I reproduced >> and bisected to this commit: >> >> commit c2df40dfb8c015211ec55f4b1dd0587f875c7b34 >> Author: Mike Christie >> Date: Sun Jun 5 14:32:17 2016 -0500 >> drivers: use req op accessor >> >> Here are the steps to reproduce the deadlock with a BRD ramdisk: >> >> mkfs.xfs -f /dev/ram0 >> mount -o dax /dev/ram0 /mnt/scratch > > When using ramdisks, we need the attached patch like in your other bug > report. I think it will fix some hangs people are seeing. > > I do not think that it should cause the failure to run issue you saw > when doing generic/008 and ext2. > I think the translation in loop.c is suspicious here: "if use DIO && not (a flush_flag or discard_flag)" should translate to: "if use DIO && not ((a flush_flag) || op == discard)" But in the patch I read: "if use DIO && ((not a flush_flag) || op == discard) Which would have DIO && discards follow the AIO path? So I would humbly suggest something like the following (on top of commit c2df40dfb8c015211ec55f4b1dd0587f875c7b34): [Please excuse the messed up patch format ... gmail eats tabs] diff --git a/drivers/block/loop.c b/drivers/block/loop.c index b9b737c..0754d83 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1659,8 +1659,9 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx, if (lo->lo_state != Lo_bound) return -EIO; - if (lo->use_dio && (!(cmd->rq->cmd_flags & REQ_FLUSH) || - req_op(cmd->rq) == REQ_OP_DISCARD)) + if (lo->use_dio && !( + (cmd->rq->cmd_flags & REQ_FLUSH) || + req_op(cmd->rq) == REQ_OP_DISCARD)) cmd->use_aio = true; else cmd->use_aio = false;