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Commit d268675c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'dm-4.8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm 

Pull device mapper fixes from Mike Snitzer:

 - a stable dm-flakey fix to error read IO during the 'down_interval'

 - a DM core suspend fix to establish the SUSPENDED flag before dropping
   the SUSPENDING flag

 - a blk-mq request-based DM (dm-mq) dm_stop_queue() fix to properly
   stop the blk-mq hw_queues (and cancel pending requeue work); also
   set/clear QUEUE_FLAG_STOPPED when stopping/starting the dm-mq
   request_queue.

 - a DM multipath fix to harden locking of in-core state flags in the
   face of concurrent access while handling path failures under heavy
   IO.

 - a few small DM raid fixes to edge cases caught with further testing.

* tag 'dm-4.8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm raid: fix use of wrong status char during resynchronization
  dm raid: constructor fails on non-zero incompat_features
  dm raid: fix processing of max_recovery_rate constructor flag
  dm: set DMF_SUSPENDED* _before_ clearing DMF_NOFLUSH_SUSPENDING
  dm rq: fix the starting and stopping of blk-mq queues
  dm mpath: add locking to multipath_resume and must_push_back
  dm flakey: error READ bios during the down_interval
parents fff648da 2a034ec1

drivers/md/dm-flakey.c

+15 −8
Original line number Diff line number Diff line
@@ -289,10 +289,16 @@ static int flakey_map(struct dm_target *ti, struct bio *bio) 
		pb->bio_submitted = true;



		/*

		 * Map reads as normal.

		 * Map reads as normal only if corrupt_bio_byte set.

		 */

		if (bio_data_dir(bio) == READ)

		if (bio_data_dir(bio) == READ) {

			/* If flags were specified, only corrupt those that match. */

			if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&

			    all_corrupt_bio_flags_match(bio, fc))

				goto map_bio;

			else

				return -EIO;

		}



		/*

		 * Drop writes?
@@ -330,12 +336,13 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio, int error) 


	/*

	 * Corrupt successful READs while in down state.

	 * If flags were specified, only corrupt those that match.

	 */

	if (fc->corrupt_bio_byte && !error && pb->bio_submitted &&

	    (bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&

	    all_corrupt_bio_flags_match(bio, fc))

	if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {

		if (fc->corrupt_bio_byte)

			corrupt_bio_data(bio, fc);

		else

			return -EIO;

	}



	return error;

}

drivers/md/dm-mpath.c

+20 −4
Original line number Diff line number Diff line
@@ -507,13 +507,27 @@ static bool __must_push_back(struct multipath *m) 


static bool must_push_back_rq(struct multipath *m)

{

	return (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) ||

	bool r;

	unsigned long flags;



	spin_lock_irqsave(&m->lock, flags);

	r = (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) ||

	     __must_push_back(m));

	spin_unlock_irqrestore(&m->lock, flags);



	return r;

}



static bool must_push_back_bio(struct multipath *m)

{

	return __must_push_back(m);

	bool r;

	unsigned long flags;



	spin_lock_irqsave(&m->lock, flags);

	r = __must_push_back(m);

	spin_unlock_irqrestore(&m->lock, flags);



	return r;

}



/*
@@ -1680,12 +1694,14 @@ static void multipath_postsuspend(struct dm_target *ti) 
static void multipath_resume(struct dm_target *ti)

{

	struct multipath *m = ti->private;

	unsigned long flags;



	spin_lock_irqsave(&m->lock, flags);

	if (test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags))

		set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	else

		clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	smp_mb__after_atomic();

	spin_unlock_irqrestore(&m->lock, flags);

}



/*

drivers/md/dm-raid.c

+2 −2
Original line number Diff line number Diff line
@@ -1270,7 +1270,7 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, 
			}

			rs->md.sync_speed_min = (int)value;

		} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {

			if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {

			if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {

				rs->ti->error = "Only one max_recovery_rate argument pair allowed";

				return -EINVAL;

			}
@@ -1960,6 +1960,7 @@ static void super_sync(struct mddev *mddev, struct md_rdev *rdev) 
	sb->data_offset = cpu_to_le64(rdev->data_offset);

	sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);

	sb->sectors = cpu_to_le64(rdev->sectors);

	sb->incompat_features = cpu_to_le32(0);



	/* Zero out the rest of the payload after the size of the superblock */

	memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
@@ -3577,7 +3578,6 @@ static int raid_preresume(struct dm_target *ti) 
	/* Be prepared for mddev_resume() in raid_resume() */

	set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);

	if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {

		set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);

		set_bit(MD_RECOVERY_SYNC, &mddev->recovery);

		mddev->resync_min = mddev->recovery_cp;

	}

drivers/md/dm-rq.c

+19 −1
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ void dm_start_queue(struct request_queue *q) 
	if (!q->mq_ops)

		dm_old_start_queue(q);

	else {

		queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, q);

		blk_mq_start_stopped_hw_queues(q, true);

		blk_mq_kick_requeue_list(q);

	}
@@ -101,9 +102,15 @@ void dm_stop_queue(struct request_queue *q) 
{

	if (!q->mq_ops)

		dm_old_stop_queue(q);

	else

	else {

		spin_lock_irq(q->queue_lock);

		queue_flag_set(QUEUE_FLAG_STOPPED, q);

		spin_unlock_irq(q->queue_lock);



		blk_mq_cancel_requeue_work(q);

		blk_mq_stop_hw_queues(q);

	}

}



static struct dm_rq_target_io *alloc_old_rq_tio(struct mapped_device *md,

						gfp_t gfp_mask)
@@ -864,6 +871,17 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, 
		dm_put_live_table(md, srcu_idx);

	}



	/*

	 * On suspend dm_stop_queue() handles stopping the blk-mq

	 * request_queue BUT: even though the hw_queues are marked

	 * BLK_MQ_S_STOPPED at that point there is still a race that

	 * is allowing block/blk-mq.c to call ->queue_rq against a

	 * hctx that it really shouldn't.  The following check guards

	 * against this rarity (albeit _not_ race-free).

	 */

	if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state)))

		return BLK_MQ_RQ_QUEUE_BUSY;



	if (ti->type->busy && ti->type->busy(ti))

		return BLK_MQ_RQ_QUEUE_BUSY;

drivers/md/dm.c

+7 −7
Original line number Diff line number Diff line
@@ -2082,7 +2082,8 @@ static void unlock_fs(struct mapped_device *md) 
 * Caller must hold md->suspend_lock

 */

static int __dm_suspend(struct mapped_device *md, struct dm_table *map,

			unsigned suspend_flags, int interruptible)

			unsigned suspend_flags, int interruptible,

			int dmf_suspended_flag)

{

	bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG;

	bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG;
@@ -2149,6 +2150,8 @@ static int __dm_suspend(struct mapped_device *md, struct dm_table *map, 
	 * to finish.

	 */

	r = dm_wait_for_completion(md, interruptible);

	if (!r)

		set_bit(dmf_suspended_flag, &md->flags);



	if (noflush)

		clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
@@ -2210,12 +2213,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) 


	map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));



	r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE);

	r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED);

	if (r)

		goto out_unlock;



	set_bit(DMF_SUSPENDED, &md->flags);



	dm_table_postsuspend_targets(map);



out_unlock:
@@ -2309,9 +2310,8 @@ static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_fla 
	 * would require changing .presuspend to return an error -- avoid this

	 * until there is a need for more elaborate variants of internal suspend.

	 */

	(void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE);



	set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);

	(void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE,

			    DMF_SUSPENDED_INTERNALLY);



	dm_table_postsuspend_targets(map);

}