1 files changed, 159 insertions, 164 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a467b492d4ad..775f1dde190a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -93,6 +93,18 @@ static int remove_and_add_spares(struct mddev *mddev,
 				 struct md_rdev *this);
 static void mddev_detach(struct mddev *mddev);
 
+enum md_ro_state {
+	MD_RDWR,
+	MD_RDONLY,
+	MD_AUTO_READ,
+	MD_MAX_STATE
+};
+
+static bool md_is_rdwr(struct mddev *mddev)
+{
+	return (mddev->ro == MD_RDWR);
+}
+
 /*
  * Default number of read corrections we'll attempt on an rdev
  * before ejecting it from the array. We divide the read error
@@ -444,7 +456,7 @@ static void md_submit_bio(struct bio *bio)
 
 	bio = bio_split_to_limits(bio);
 
-	if (mddev->ro == 1 && unlikely(rw == WRITE)) {
+	if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) {
 		if (bio_sectors(bio) != 0)
 			bio->bi_status = BLK_STS_IOERR;
 		bio_endio(bio);
@@ -509,13 +521,14 @@ static void md_end_flush(struct bio *bio)
 	struct md_rdev *rdev = bio->bi_private;
 	struct mddev *mddev = rdev->mddev;
 
+	bio_put(bio);
+
 	rdev_dec_pending(rdev, mddev);
 
 	if (atomic_dec_and_test(&mddev->flush_pending)) {
 		/* The pre-request flush has finished */
 		queue_work(md_wq, &mddev->flush_work);
 	}
-	bio_put(bio);
 }
 
 static void md_submit_flush_data(struct work_struct *ws);
@@ -913,10 +926,12 @@ static void super_written(struct bio *bio)
 	} else
 		clear_bit(LastDev, &rdev->flags);
 
+	bio_put(bio);
+
+	rdev_dec_pending(rdev, mddev);
+
 	if (atomic_dec_and_test(&mddev->pending_writes))
 		wake_up(&mddev->sb_wait);
-	rdev_dec_pending(rdev, mddev);
-	bio_put(bio);
 }
 
 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
@@ -2453,7 +2468,22 @@ static void rdev_delayed_delete(struct work_struct *ws)
 	kobject_put(&rdev->kobj);
 }
 
-static void unbind_rdev_from_array(struct md_rdev *rdev)
+void md_autodetect_dev(dev_t dev);
+
+static void export_rdev(struct md_rdev *rdev)
+{
+	pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
+	md_rdev_clear(rdev);
+#ifndef MODULE
+	if (test_bit(AutoDetected, &rdev->flags))
+		md_autodetect_dev(rdev->bdev->bd_dev);
+#endif
+	blkdev_put(rdev->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+	rdev->bdev = NULL;
+	kobject_put(&rdev->kobj);
+}
+
+static void md_kick_rdev_from_array(struct md_rdev *rdev)
 {
 	bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
 	list_del_rcu(&rdev->same_set);
@@ -2476,56 +2506,8 @@ static void unbind_rdev_from_array(struct md_rdev *rdev)
 	INIT_WORK(&rdev->del_work, rdev_delayed_delete);
 	kobject_get(&rdev->kobj);
 	queue_work(md_rdev_misc_wq, &rdev->del_work);
-}
-
-/*
- * prevent the device from being mounted, repartitioned or
- * otherwise reused by a RAID array (or any other kernel
- * subsystem), by bd_claiming the device.
- */
-static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
-{
-	int err = 0;
-	struct block_device *bdev;
-
-	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
-				 shared ? (struct md_rdev *)lock_rdev : rdev);
-	if (IS_ERR(bdev)) {
-		pr_warn("md: could not open device unknown-block(%u,%u).\n",
-			MAJOR(dev), MINOR(dev));
-		return PTR_ERR(bdev);
-	}
-	rdev->bdev = bdev;
-	return err;
-}
-
-static void unlock_rdev(struct md_rdev *rdev)
-{
-	struct block_device *bdev = rdev->bdev;
-	rdev->bdev = NULL;
-	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-}
-
-void md_autodetect_dev(dev_t dev);
-
-static void export_rdev(struct md_rdev *rdev)
-{
-	pr_debug("md: export_rdev(%pg)\n", rdev->bdev);
-	md_rdev_clear(rdev);
-#ifndef MODULE
-	if (test_bit(AutoDetected, &rdev->flags))
-		md_autodetect_dev(rdev->bdev->bd_dev);
-#endif
-	unlock_rdev(rdev);
-	kobject_put(&rdev->kobj);
-}
-
-void md_kick_rdev_from_array(struct md_rdev *rdev)
-{
-	unbind_rdev_from_array(rdev);
 	export_rdev(rdev);
 }
-EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
 
 static void export_array(struct mddev *mddev)
 {
@@ -2639,7 +2621,7 @@ void md_update_sb(struct mddev *mddev, int force_change)
 	int any_badblocks_changed = 0;
 	int ret = -1;
 
-	if (mddev->ro) {
+	if (!md_is_rdwr(mddev)) {
 		if (force_change)
 			set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
 		return;
@@ -3660,9 +3642,10 @@ EXPORT_SYMBOL_GPL(md_rdev_init);
  */
 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
 {
-	int err;
+	static struct md_rdev *claim_rdev; /* just for claiming the bdev */
 	struct md_rdev *rdev;
 	sector_t size;
+	int err;
 
 	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
 	if (!rdev)
@@ -3670,14 +3653,20 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
 
 	err = md_rdev_init(rdev);
 	if (err)
-		goto abort_free;
+		goto out_free_rdev;
 	err = alloc_disk_sb(rdev);
 	if (err)
-		goto abort_free;
+		goto out_clear_rdev;
 
-	err = lock_rdev(rdev, newdev, super_format == -2);
-	if (err)
-		goto abort_free;
+	rdev->bdev = blkdev_get_by_dev(newdev,
+			FMODE_READ | FMODE_WRITE | FMODE_EXCL,
+			super_format == -2 ? claim_rdev : rdev);
+	if (IS_ERR(rdev->bdev)) {
+		pr_warn("md: could not open device unknown-block(%u,%u).\n",
+			MAJOR(newdev), MINOR(newdev));
+		err = PTR_ERR(rdev->bdev);
+		goto out_clear_rdev;
+	}
 
 	kobject_init(&rdev->kobj, &rdev_ktype);
 
@@ -3686,7 +3675,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
 		pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
 			rdev->bdev);
 		err = -EINVAL;
-		goto abort_free;
+		goto out_blkdev_put;
 	}
 
 	if (super_format >= 0) {
@@ -3696,21 +3685,22 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
 			pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
 				rdev->bdev,
 				super_format, super_minor);
-			goto abort_free;
+			goto out_blkdev_put;
 		}
 		if (err < 0) {
 			pr_warn("md: could not read %pg's sb, not importing!\n",
 				rdev->bdev);
-			goto abort_free;
+			goto out_blkdev_put;
 		}
 	}
 
 	return rdev;
 
-abort_free:
-	if (rdev->bdev)
-		unlock_rdev(rdev);
+out_blkdev_put:
+	blkdev_put(rdev->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+out_clear_rdev:
 	md_rdev_clear(rdev);
+out_free_rdev:
 	kfree(rdev);
 	return ERR_PTR(err);
 }
@@ -3901,7 +3891,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
 		goto out_unlock;
 	}
 	rv = -EROFS;
-	if (mddev->ro)
+	if (!md_is_rdwr(mddev))
 		goto out_unlock;
 
 	/* request to change the personality.  Need to ensure:
@@ -4107,7 +4097,7 @@ layout_store(struct mddev *mddev, const char *buf, size_t len)
 	if (mddev->pers) {
 		if (mddev->pers->check_reshape == NULL)
 			err = -EBUSY;
-		else if (mddev->ro)
+		else if (!md_is_rdwr(mddev))
 			err = -EROFS;
 		else {
 			mddev->new_layout = n;
@@ -4216,7 +4206,7 @@ chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
 	if (mddev->pers) {
 		if (mddev->pers->check_reshape == NULL)
 			err = -EBUSY;
-		else if (mddev->ro)
+		else if (!md_is_rdwr(mddev))
 			err = -EROFS;
 		else {
 			mddev->new_chunk_sectors = n >> 9;
@@ -4339,13 +4329,13 @@ array_state_show(struct mddev *mddev, char *page)
 
 	if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
 		switch(mddev->ro) {
-		case 1:
+		case MD_RDONLY:
 			st = readonly;
 			break;
-		case 2:
+		case MD_AUTO_READ:
 			st = read_auto;
 			break;
-		case 0:
+		case MD_RDWR:
 			spin_lock(&mddev->lock);
 			if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
 				st = write_pending;
@@ -4381,7 +4371,8 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 	int err = 0;
 	enum array_state st = match_word(buf, array_states);
 
-	if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
+	if (mddev->pers && (st == active || st == clean) &&
+	    mddev->ro != MD_RDONLY) {
 		/* don't take reconfig_mutex when toggling between
 		 * clean and active
 		 */
@@ -4425,23 +4416,23 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 		if (mddev->pers)
 			err = md_set_readonly(mddev, NULL);
 		else {
-			mddev->ro = 1;
+			mddev->ro = MD_RDONLY;
 			set_disk_ro(mddev->gendisk, 1);
 			err = do_md_run(mddev);
 		}
 		break;
 	case read_auto:
 		if (mddev->pers) {
-			if (mddev->ro == 0)
+			if (md_is_rdwr(mddev))
 				err = md_set_readonly(mddev, NULL);
-			else if (mddev->ro == 1)
+			else if (mddev->ro == MD_RDONLY)
 				err = restart_array(mddev);
 			if (err == 0) {
-				mddev->ro = 2;
+				mddev->ro = MD_AUTO_READ;
 				set_disk_ro(mddev->gendisk, 0);
 			}
 		} else {
-			mddev->ro = 2;
+			mddev->ro = MD_AUTO_READ;
 			err = do_md_run(mddev);
 		}
 		break;
@@ -4466,7 +4457,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
 			wake_up(&mddev->sb_wait);
 			err = 0;
 		} else {
-			mddev->ro = 0;
+			mddev->ro = MD_RDWR;
 			set_disk_ro(mddev->gendisk, 0);
 			err = do_md_run(mddev);
 		}
@@ -4765,7 +4756,7 @@ action_show(struct mddev *mddev, char *page)
 	if (test_bit(MD_RECOVERY_FROZEN, &recovery))
 		type = "frozen";
 	else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
-	    (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
+	    (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
 		if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
 			type = "reshape";
 		else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
@@ -4851,11 +4842,11 @@ action_store(struct mddev *mddev, const char *page, size_t len)
 		set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
 		set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
 	}
-	if (mddev->ro == 2) {
+	if (mddev->ro == MD_AUTO_READ) {
 		/* A write to sync_action is enough to justify
 		 * canceling read-auto mode
 		 */
-		mddev->ro = 0;
+		mddev->ro = MD_RDWR;
 		md_wakeup_thread(mddev->sync_thread);
 	}
 	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@@ -5083,8 +5074,7 @@ max_sync_store(struct mddev *mddev, const char *buf, size_t len)
 			goto out_unlock;
 
 		err = -EBUSY;
-		if (max < mddev->resync_max &&
-		    mddev->ro == 0 &&
+		if (max < mddev->resync_max && md_is_rdwr(mddev) &&
 		    test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
 			goto out_unlock;
 
@@ -5813,8 +5803,8 @@ int md_run(struct mddev *mddev)
 			continue;
 		sync_blockdev(rdev->bdev);
 		invalidate_bdev(rdev->bdev);
-		if (mddev->ro != 1 && rdev_read_only(rdev)) {
-			mddev->ro = 1;
+		if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) {
+			mddev->ro = MD_RDONLY;
 			if (mddev->gendisk)
 				set_disk_ro(mddev->gendisk, 1);
 		}
@@ -5917,8 +5907,8 @@ int md_run(struct mddev *mddev)
 
 	mddev->ok_start_degraded = start_dirty_degraded;
 
-	if (start_readonly && mddev->ro == 0)
-		mddev->ro = 2; /* read-only, but switch on first write */
+	if (start_readonly && md_is_rdwr(mddev))
+		mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */
 
 	err = pers->run(mddev);
 	if (err)
@@ -5996,8 +5986,8 @@ int md_run(struct mddev *mddev)
 		mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
 		mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
 		mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
-	} else if (mddev->ro == 2) /* auto-readonly not meaningful */
-		mddev->ro = 0;
+	} else if (mddev->ro == MD_AUTO_READ)
+		mddev->ro = MD_RDWR;
 
 	atomic_set(&mddev->max_corr_read_errors,
 		   MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
@@ -6015,7 +6005,7 @@ int md_run(struct mddev *mddev)
 		if (rdev->raid_disk >= 0)
 			sysfs_link_rdev(mddev, rdev); /* failure here is OK */
 
-	if (mddev->degraded && !mddev->ro)
+	if (mddev->degraded && md_is_rdwr(mddev))
 		/* This ensures that recovering status is reported immediately
 		 * via sysfs - until a lack of spares is confirmed.
 		 */
@@ -6105,7 +6095,7 @@ static int restart_array(struct mddev *mddev)
 		return -ENXIO;
 	if (!mddev->pers)
 		return -EINVAL;
-	if (!mddev->ro)
+	if (md_is_rdwr(mddev))
 		return -EBUSY;
 
 	rcu_read_lock();
@@ -6124,7 +6114,7 @@ static int restart_array(struct mddev *mddev)
 		return -EROFS;
 
 	mddev->safemode = 0;
-	mddev->ro = 0;
+	mddev->ro = MD_RDWR;
 	set_disk_ro(disk, 0);
 	pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
 	/* Kick recovery or resync if necessary */
@@ -6151,7 +6141,7 @@ static void md_clean(struct mddev *mddev)
 	mddev->clevel[0] = 0;
 	mddev->flags = 0;
 	mddev->sb_flags = 0;
-	mddev->ro = 0;
+	mddev->ro = MD_RDWR;
 	mddev->metadata_type[0] = 0;
 	mddev->chunk_sectors = 0;
 	mddev->ctime = mddev->utime = 0;
@@ -6203,7 +6193,7 @@ static void __md_stop_writes(struct mddev *mddev)
 	}
 	md_bitmap_flush(mddev);
 
-	if (mddev->ro == 0 &&
+	if (md_is_rdwr(mddev) &&
 	    ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
 	     mddev->sb_flags)) {
 		/* mark array as shutdown cleanly */
@@ -6312,9 +6302,9 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
 		__md_stop_writes(mddev);
 
 		err  = -ENXIO;
-		if (mddev->ro==1)
+		if (mddev->ro == MD_RDONLY)
 			goto out;
-		mddev->ro = 1;
+		mddev->ro = MD_RDONLY;
 		set_disk_ro(mddev->gendisk, 1);
 		clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@@ -6371,7 +6361,7 @@ static int do_md_stop(struct mddev *mddev, int mode,
 		return -EBUSY;
 	}
 	if (mddev->pers) {
-		if (mddev->ro)
+		if (!md_is_rdwr(mddev))
 			set_disk_ro(disk, 0);
 
 		__md_stop_writes(mddev);
@@ -6388,8 +6378,8 @@ static int do_md_stop(struct mddev *mddev, int mode,
 		mutex_unlock(&mddev->open_mutex);
 		mddev->changed = 1;
 
-		if (mddev->ro)
-			mddev->ro = 0;
+		if (!md_is_rdwr(mddev))
+			mddev->ro = MD_RDWR;
 	} else
 		mutex_unlock(&mddev->open_mutex);
 	/*
@@ -7204,7 +7194,7 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
 	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
 	    mddev->sync_thread)
 		return -EBUSY;
-	if (mddev->ro)
+	if (!md_is_rdwr(mddev))
 		return -EROFS;
 
 	rdev_for_each(rdev, mddev) {
@@ -7234,7 +7224,7 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks)
 	/* change the number of raid disks */
 	if (mddev->pers->check_reshape == NULL)
 		return -EINVAL;
-	if (mddev->ro)
+	if (!md_is_rdwr(mddev))
 		return -EROFS;
 	if (raid_disks <= 0 ||
 	    (mddev->max_disks && raid_disks >= mddev->max_disks))
@@ -7464,6 +7454,40 @@ static inline bool md_ioctl_valid(unsigned int cmd)
 	}
 }
 
+static int __md_set_array_info(struct mddev *mddev, void __user *argp)
+{
+	mdu_array_info_t info;
+	int err;
+
+	if (!argp)
+		memset(&info, 0, sizeof(info));
+	else if (copy_from_user(&info, argp, sizeof(info)))
+		return -EFAULT;
+
+	if (mddev->pers) {
+		err = update_array_info(mddev, &info);
+		if (err)
+			pr_warn("md: couldn't update array info. %d\n", err);
+		return err;
+	}
+
+	if (!list_empty(&mddev->disks)) {
+		pr_warn("md: array %s already has disks!\n", mdname(mddev));
+		return -EBUSY;
+	}
+
+	if (mddev->raid_disks) {
+		pr_warn("md: array %s already initialised!\n", mdname(mddev));
+		return -EBUSY;
+	}
+
+	err = md_set_array_info(mddev, &info);
+	if (err)
+		pr_warn("md: couldn't set array info. %d\n", err);
+
+	return err;
+}
+
 static int md_ioctl(struct block_device *bdev, fmode_t mode,
 			unsigned int cmd, unsigned long arg)
 {
@@ -7569,36 +7593,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
 	}
 
 	if (cmd == SET_ARRAY_INFO) {
-		mdu_array_info_t info;
-		if (!arg)
-			memset(&info, 0, sizeof(info));
-		else if (copy_from_user(&info, argp, sizeof(info))) {
-			err = -EFAULT;
-			goto unlock;
-		}
-		if (mddev->pers) {
-			err = update_array_info(mddev, &info);
-			if (err) {
-				pr_warn("md: couldn't update array info. %d\n", err);
-				goto unlock;
-			}
-			goto unlock;
-		}
-		if (!list_empty(&mddev->disks)) {
-			pr_warn("md: array %s already has disks!\n", mdname(mddev));
-			err = -EBUSY;
-			goto unlock;
-		}
-		if (mddev->raid_disks) {
-			pr_warn("md: array %s already initialised!\n", mdname(mddev));
-			err = -EBUSY;
-			goto unlock;
-		}
-		err = md_set_array_info(mddev, &info);
-		if (err) {
-			pr_warn("md: couldn't set array info. %d\n", err);
-			goto unlock;
-		}
+		err = __md_set_array_info(mddev, argp);
 		goto unlock;
 	}
 
@@ -7658,26 +7653,25 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
 	 * The remaining ioctls are changing the state of the
 	 * superblock, so we do not allow them on read-only arrays.
 	 */
-	if (mddev->ro && mddev->pers) {
-		if (mddev->ro == 2) {
-			mddev->ro = 0;
-			sysfs_notify_dirent_safe(mddev->sysfs_state);
-			set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-			/* mddev_unlock will wake thread */
-			/* If a device failed while we were read-only, we
-			 * need to make sure the metadata is updated now.
-			 */
-			if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
-				mddev_unlock(mddev);
-				wait_event(mddev->sb_wait,
-					   !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
-					   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
-				mddev_lock_nointr(mddev);
-			}
-		} else {
+	if (!md_is_rdwr(mddev) && mddev->pers) {
+		if (mddev->ro != MD_AUTO_READ) {
 			err = -EROFS;
 			goto unlock;
 		}
+		mddev->ro = MD_RDWR;
+		sysfs_notify_dirent_safe(mddev->sysfs_state);
+		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+		/* mddev_unlock will wake thread */
+		/* If a device failed while we were read-only, we
+		 * need to make sure the metadata is updated now.
+		 */
+		if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
+			mddev_unlock(mddev);
+			wait_event(mddev->sb_wait,
+				   !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
+				   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
+			mddev_lock_nointr(mddev);
+		}
 	}
 
 	switch (cmd) {
@@ -7763,11 +7757,11 @@ static int md_set_read_only(struct block_device *bdev, bool ro)
 	 * Transitioning to read-auto need only happen for arrays that call
 	 * md_write_start and which are not ready for writes yet.
 	 */
-	if (!ro && mddev->ro == 1 && mddev->pers) {
+	if (!ro && mddev->ro == MD_RDONLY && mddev->pers) {
 		err = restart_array(mddev);
 		if (err)
 			goto out_unlock;
-		mddev->ro = 2;
+		mddev->ro = MD_AUTO_READ;
 	}
 
 out_unlock:
@@ -8241,9 +8235,9 @@ static int md_seq_show(struct seq_file *seq, void *v)
 		seq_printf(seq, "%s : %sactive", mdname(mddev),
 						mddev->pers ? "" : "in");
 		if (mddev->pers) {
-			if (mddev->ro==1)
+			if (mddev->ro == MD_RDONLY)
 				seq_printf(seq, " (read-only)");
-			if (mddev->ro==2)
+			if (mddev->ro == MD_AUTO_READ)
 				seq_printf(seq, " (auto-read-only)");
 			seq_printf(seq, " %s", mddev->pers->name);
 		}
@@ -8502,10 +8496,10 @@ bool md_write_start(struct mddev *mddev, struct bio *bi)
 	if (bio_data_dir(bi) != WRITE)
 		return true;
 
-	BUG_ON(mddev->ro == 1);
-	if (mddev->ro == 2) {
+	BUG_ON(mddev->ro == MD_RDONLY);
+	if (mddev->ro == MD_AUTO_READ) {
 		/* need to switch to read/write */
-		mddev->ro = 0;
+		mddev->ro = MD_RDWR;
 		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
 		md_wakeup_thread(mddev->thread);
 		md_wakeup_thread(mddev->sync_thread);
@@ -8556,7 +8550,7 @@ void md_write_inc(struct mddev *mddev, struct bio *bi)
 {
 	if (bio_data_dir(bi) != WRITE)
 		return;
-	WARN_ON_ONCE(mddev->in_sync || mddev->ro);
+	WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev));
 	percpu_ref_get(&mddev->writes_pending);
 }
 EXPORT_SYMBOL(md_write_inc);
@@ -8661,7 +8655,7 @@ void md_allow_write(struct mddev *mddev)
 {
 	if (!mddev->pers)
 		return;
-	if (mddev->ro)
+	if (!md_is_rdwr(mddev))
 		return;
 	if (!mddev->pers->sync_request)
 		return;
@@ -8709,7 +8703,7 @@ void md_do_sync(struct md_thread *thread)
 	if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
 	    test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
 		return;
-	if (mddev->ro) {/* never try to sync a read-only array */
+	if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
 		set_bit(MD_RECOVERY_INTR, &mddev->recovery);
 		return;
 	}
@@ -9178,9 +9172,9 @@ static int remove_and_add_spares(struct mddev *mddev,
 		if (test_bit(Faulty, &rdev->flags))
 			continue;
 		if (!test_bit(Journal, &rdev->flags)) {
-			if (mddev->ro &&
-			    ! (rdev->saved_raid_disk >= 0 &&
-			       !test_bit(Bitmap_sync, &rdev->flags)))
+			if (!md_is_rdwr(mddev) &&
+			    !(rdev->saved_raid_disk >= 0 &&
+			      !test_bit(Bitmap_sync, &rdev->flags)))
 				continue;
 
 			rdev->recovery_offset = 0;
@@ -9278,7 +9272,8 @@ void md_check_recovery(struct mddev *mddev)
 		flush_signals(current);
 	}
 
-	if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
+	if (!md_is_rdwr(mddev) &&
+	    !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
 		return;
 	if ( ! (
 		(mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
@@ -9297,7 +9292,7 @@ void md_check_recovery(struct mddev *mddev)
 		if (!mddev->external && mddev->safemode == 1)
 			mddev->safemode = 0;
 
-		if (mddev->ro) {
+		if (!md_is_rdwr(mddev)) {
 			struct md_rdev *rdev;
 			if (!mddev->external && mddev->in_sync)
 				/* 'Blocked' flag not needed as failed devices