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Commit 3a87711e authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'md/4.4-rc5-fixes' of git://neil.brown.name/md 

Pull md fixes from Neil Brown:
 "Four fixes for md:

   - two recently introduced regressions fixed.
   - one older bug in RAID10 - tagged for -stable since 4.2
   - one minor sysfs api improvement"

* tag 'md/4.4-rc5-fixes' of git://neil.brown.name/md:
  Fix remove_and_add_spares removes drive added as spare in slot_store
  md: fix bug due to nested suspend
  MD: change journal disk role to disk 0
  md/raid10: fix data corruption and crash during resync
parents 35b3154e cb01c549

drivers/md/md.c

+15 −7
Original line number Diff line number Diff line
@@ -314,8 +314,8 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) 
 */

void mddev_suspend(struct mddev *mddev)

{

	BUG_ON(mddev->suspended);

	mddev->suspended = 1;

	if (mddev->suspended++)

		return;

	synchronize_rcu();

	wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);

	mddev->pers->quiesce(mddev, 1);
@@ -326,7 +326,8 @@ EXPORT_SYMBOL_GPL(mddev_suspend); 


void mddev_resume(struct mddev *mddev)

{

	mddev->suspended = 0;

	if (--mddev->suspended)

		return;

	wake_up(&mddev->sb_wait);

	mddev->pers->quiesce(mddev, 0);
@@ -1652,7 +1653,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 
			rdev->journal_tail = le64_to_cpu(sb->journal_tail);

			if (mddev->recovery_cp == MaxSector)

				set_bit(MD_JOURNAL_CLEAN, &mddev->flags);

			rdev->raid_disk = mddev->raid_disks;

			rdev->raid_disk = 0;

			break;

		default:

			rdev->saved_raid_disk = role;
@@ -2773,6 +2774,7 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len) 
		/* Activating a spare .. or possibly reactivating

		 * if we ever get bitmaps working here.

		 */

		int err;



		if (rdev->raid_disk != -1)

			return -EBUSY;
@@ -2794,9 +2796,15 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len) 
			rdev->saved_raid_disk = -1;

		clear_bit(In_sync, &rdev->flags);

		clear_bit(Bitmap_sync, &rdev->flags);

		remove_and_add_spares(rdev->mddev, rdev);

		if (rdev->raid_disk == -1)

			return -EBUSY;

		err = rdev->mddev->pers->

			hot_add_disk(rdev->mddev, rdev);

		if (err) {

			rdev->raid_disk = -1;

			return err;

		} else

			sysfs_notify_dirent_safe(rdev->sysfs_state);

		if (sysfs_link_rdev(rdev->mddev, rdev))

			/* failure here is OK */;

		/* don't wakeup anyone, leave that to userspace. */

	} else {

		if (slot >= rdev->mddev->raid_disks &&

drivers/md/md.h

+6 −2
Original line number Diff line number Diff line
@@ -566,7 +566,9 @@ static inline char * mdname (struct mddev * mddev) 
static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev)

{

	char nm[20];

	if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) {

	if (!test_bit(Replacement, &rdev->flags) &&

	    !test_bit(Journal, &rdev->flags) &&

	    mddev->kobj.sd) {

		sprintf(nm, "rd%d", rdev->raid_disk);

		return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);

	} else
@@ -576,7 +578,9 @@ static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 
static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev)

{

	char nm[20];

	if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) {

	if (!test_bit(Replacement, &rdev->flags) &&

	    !test_bit(Journal, &rdev->flags) &&

	    mddev->kobj.sd) {

		sprintf(nm, "rd%d", rdev->raid_disk);

		sysfs_remove_link(&mddev->kobj, nm);

	}

drivers/md/raid10.c

+3 −1
Original line number Diff line number Diff line
@@ -1946,6 +1946,8 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) 


	first = i;

	fbio = r10_bio->devs[i].bio;

	fbio->bi_iter.bi_size = r10_bio->sectors << 9;

	fbio->bi_iter.bi_idx = 0;



	vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9);

	/* now find blocks with errors */
@@ -1989,7 +1991,7 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) 
		bio_reset(tbio);



		tbio->bi_vcnt = vcnt;

		tbio->bi_iter.bi_size = r10_bio->sectors << 9;

		tbio->bi_iter.bi_size = fbio->bi_iter.bi_size;

		tbio->bi_rw = WRITE;

		tbio->bi_private = r10_bio;

		tbio->bi_iter.bi_sector = r10_bio->devs[i].addr;