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Commit 3009b303 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 

Pull MD fixes from Shaohua Li:

 - fix a parity calculation bug of raid5 cache by Song

 - fix a potential deadlock issue by me

 - fix two endian issues by Jason

 - fix a disk limitation issue by Neil

 - other small fixes and cleanup

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  md/raid1: fix a trivial typo in comments
  md/r5cache: fix set_syndrome_sources() for data in cache
  md: fix incorrect use of lexx_to_cpu in does_sb_need_changing
  md: fix super_offset endianness in super_1_rdev_size_change
  md/raid1/10: fix potential deadlock
  md: don't impose the MD_SB_DISKS limit on arrays without metadata.
  md: move funcs from pers->resize to update_size
  md-cluster: remove useless memset from gather_all_resync_info
  md-cluster: free md_cluster_info if node leave cluster
  md: delete dead code
  md/raid10: submit bio directly to replacement disk
parents 69eea5a4 11353b9d

drivers/md/md-cluster.c

+1 −1
Original line number Diff line number Diff line
@@ -777,7 +777,6 @@ static int gather_all_resync_info(struct mddev *mddev, int total_slots) 
		bm_lockres->flags |= DLM_LKF_NOQUEUE;

		ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);

		if (ret == -EAGAIN) {

			memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);

			s = read_resync_info(mddev, bm_lockres);

			if (s) {

				pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
@@ -974,6 +973,7 @@ static int leave(struct mddev *mddev) 
	lockres_free(cinfo->bitmap_lockres);

	unlock_all_bitmaps(mddev);

	dlm_release_lockspace(cinfo->lockspace, 2);

	kfree(cinfo);

	return 0;

}

drivers/md/md.c

+11 −16
Original line number Diff line number Diff line
@@ -440,14 +440,6 @@ void md_flush_request(struct mddev *mddev, struct bio *bio) 
}

EXPORT_SYMBOL(md_flush_request);



void md_unplug(struct blk_plug_cb *cb, bool from_schedule)

{

	struct mddev *mddev = cb->data;

	md_wakeup_thread(mddev->thread);

	kfree(cb);

}

EXPORT_SYMBOL(md_unplug);



static inline struct mddev *mddev_get(struct mddev *mddev)

{

	atomic_inc(&mddev->active);
@@ -1887,7 +1879,7 @@ super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 
	}

	sb = page_address(rdev->sb_page);

	sb->data_size = cpu_to_le64(num_sectors);

	sb->super_offset = rdev->sb_start;

	sb->super_offset = cpu_to_le64(rdev->sb_start);

	sb->sb_csum = calc_sb_1_csum(sb);

	do {

		md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
@@ -2295,7 +2287,7 @@ static bool does_sb_need_changing(struct mddev *mddev) 
	/* Check if any mddev parameters have changed */

	if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||

	    (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||

	    (mddev->layout != le64_to_cpu(sb->layout)) ||

	    (mddev->layout != le32_to_cpu(sb->layout)) ||

	    (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||

	    (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))

		return true;
@@ -6458,9 +6450,8 @@ static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) 
	mddev->layout        = info->layout;

	mddev->chunk_sectors = info->chunk_size >> 9;



	mddev->max_disks     = MD_SB_DISKS;



	if (mddev->persistent) {

		mddev->max_disks = MD_SB_DISKS;

		mddev->flags = 0;

		mddev->sb_flags = 0;

	}
@@ -6533,8 +6524,12 @@ static int update_size(struct mddev *mddev, sector_t num_sectors) 
			return -ENOSPC;

	}

	rv = mddev->pers->resize(mddev, num_sectors);

	if (!rv)

	if (!rv) {

		if (mddev->queue) {

			set_capacity(mddev->gendisk, mddev->array_sectors);

			revalidate_disk(mddev->gendisk);

		}

	}

	return rv;

}

drivers/md/md.h

+0 −6
Original line number Diff line number Diff line
@@ -676,16 +676,10 @@ extern void mddev_resume(struct mddev *mddev); 
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,

				   struct mddev *mddev);



extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);

extern void md_reload_sb(struct mddev *mddev, int raid_disk);

extern void md_update_sb(struct mddev *mddev, int force);

extern void md_kick_rdev_from_array(struct md_rdev * rdev);

struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr);

static inline int mddev_check_plugged(struct mddev *mddev)

{

	return !!blk_check_plugged(md_unplug, mddev,

				   sizeof(struct blk_plug_cb));

}



static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)

{

drivers/md/raid1.c

+24 −5
Original line number Diff line number Diff line
@@ -1027,7 +1027,7 @@ static int get_unqueued_pending(struct r1conf *conf) 
static void freeze_array(struct r1conf *conf, int extra)

{

	/* Stop sync I/O and normal I/O and wait for everything to

	 * go quite.

	 * go quiet.

	 * This is called in two situations:

	 * 1) management command handlers (reshape, remove disk, quiesce).

	 * 2) one normal I/O request failed.
@@ -1587,9 +1587,30 @@ static void raid1_make_request(struct mddev *mddev, struct bio *bio) 
			split = bio;

		}



		if (bio_data_dir(split) == READ)

		if (bio_data_dir(split) == READ) {

			raid1_read_request(mddev, split);

		else



			/*

			 * If a bio is splitted, the first part of bio will

			 * pass barrier but the bio is queued in

			 * current->bio_list (see generic_make_request). If

			 * there is a raise_barrier() called here, the second

			 * part of bio can't pass barrier. But since the first

			 * part bio isn't dispatched to underlaying disks yet,

			 * the barrier is never released, hence raise_barrier

			 * will alays wait. We have a deadlock.

			 * Note, this only happens in read path. For write

			 * path, the first part of bio is dispatched in a

			 * schedule() call (because of blk plug) or offloaded

			 * to raid10d.

			 * Quitting from the function immediately can change

			 * the bio order queued in bio_list and avoid the deadlock.

			 */

			if (split != bio) {

				generic_make_request(bio);

				break;

			}

		} else

			raid1_write_request(mddev, split);

	} while (split != bio);

}
@@ -3246,8 +3267,6 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors) 
			return ret;

	}

	md_set_array_sectors(mddev, newsize);

	set_capacity(mddev->gendisk, mddev->array_sectors);

	revalidate_disk(mddev->gendisk);

	if (sectors > mddev->dev_sectors &&

	    mddev->recovery_cp > mddev->dev_sectors) {

		mddev->recovery_cp = mddev->dev_sectors;

drivers/md/raid10.c

+34 −7
Original line number Diff line number Diff line
@@ -1478,11 +1478,24 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, 
			mbio->bi_bdev = (void*)rdev;



			atomic_inc(&r10_bio->remaining);



			cb = blk_check_plugged(raid10_unplug, mddev,

					       sizeof(*plug));

			if (cb)

				plug = container_of(cb, struct raid10_plug_cb,

						    cb);

			else

				plug = NULL;

			spin_lock_irqsave(&conf->device_lock, flags);

			if (plug) {

				bio_list_add(&plug->pending, mbio);

				plug->pending_cnt++;

			} else {

				bio_list_add(&conf->pending_bio_list, mbio);

				conf->pending_count++;

			}

			spin_unlock_irqrestore(&conf->device_lock, flags);

			if (!mddev_check_plugged(mddev))

			if (!plug)

				md_wakeup_thread(mddev->thread);

		}

	}
@@ -1572,7 +1585,25 @@ static void raid10_make_request(struct mddev *mddev, struct bio *bio) 
			split = bio;

		}



		/*

		 * If a bio is splitted, the first part of bio will pass

		 * barrier but the bio is queued in current->bio_list (see

		 * generic_make_request). If there is a raise_barrier() called

		 * here, the second part of bio can't pass barrier. But since

		 * the first part bio isn't dispatched to underlaying disks

		 * yet, the barrier is never released, hence raise_barrier will

		 * alays wait. We have a deadlock.

		 * Note, this only happens in read path. For write path, the

		 * first part of bio is dispatched in a schedule() call

		 * (because of blk plug) or offloaded to raid10d.

		 * Quitting from the function immediately can change the bio

		 * order queued in bio_list and avoid the deadlock.

		 */

		__make_request(mddev, split);

		if (split != bio && bio_data_dir(bio) == READ) {

			generic_make_request(bio);

			break;

		}

	} while (split != bio);



	/* In case raid10d snuck in to freeze_array */
@@ -3944,10 +3975,6 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors) 
			return ret;

	}

	md_set_array_sectors(mddev, size);

	if (mddev->queue) {

		set_capacity(mddev->gendisk, mddev->array_sectors);

		revalidate_disk(mddev->gendisk);

	}

	if (sectors > mddev->dev_sectors &&

	    mddev->recovery_cp > oldsize) {

		mddev->recovery_cp = oldsize;