1 files changed, 130 insertions, 557 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 61aacab424cf..e55e6cf9ec17 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -34,6 +34,7 @@
 
 #include <linux/kthread.h>
 #include <linux/blkdev.h>
+#include <linux/badblocks.h>
 #include <linux/sysctl.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>
@@ -205,15 +206,6 @@ void md_new_event(struct mddev *mddev)
 }
 EXPORT_SYMBOL_GPL(md_new_event);
 
-/* Alternate version that can be called from interrupts
- * when calling sysfs_notify isn't needed.
- */
-static void md_new_event_inintr(struct mddev *mddev)
-{
-	atomic_inc(&md_event_count);
-	wake_up(&md_event_waiters);
-}
-
 /*
  * Enables to iterate over all existing md arrays
  * all_mddevs_lock protects this list.
@@ -259,8 +251,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
 
 	blk_queue_split(q, &bio, q->bio_split);
 
-	if (mddev == NULL || mddev->pers == NULL
-	    || !mddev->ready) {
+	if (mddev == NULL || mddev->pers == NULL) {
 		bio_io_error(bio);
 		return BLK_QC_T_NONE;
 	}
@@ -710,8 +701,7 @@ void md_rdev_clear(struct md_rdev *rdev)
 		put_page(rdev->bb_page);
 		rdev->bb_page = NULL;
 	}
-	kfree(rdev->badblocks.page);
-	rdev->badblocks.page = NULL;
+	badblocks_exit(&rdev->badblocks);
 }
 EXPORT_SYMBOL_GPL(md_rdev_clear);
 
@@ -1026,8 +1016,9 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor
 	 * (not needed for Linear and RAID0 as metadata doesn't
 	 * record this size)
 	 */
-	if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
-		rdev->sectors = (2ULL << 32) - 2;
+	if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
+	    sb->level >= 1)
+		rdev->sectors = (sector_t)(2ULL << 32) - 2;
 
 	if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
 		/* "this cannot possibly happen" ... */
@@ -1199,13 +1190,13 @@ static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
 	memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
 	memcpy(&sb->set_uuid3, mddev->uuid+12,4);
 
-	sb->ctime = mddev->ctime;
+	sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
 	sb->level = mddev->level;
 	sb->size = mddev->dev_sectors / 2;
 	sb->raid_disks = mddev->raid_disks;
 	sb->md_minor = mddev->md_minor;
 	sb->not_persistent = 0;
-	sb->utime = mddev->utime;
+	sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
 	sb->state = 0;
 	sb->events_hi = (mddev->events>>32);
 	sb->events_lo = (u32)mddev->events;
@@ -1320,8 +1311,9 @@ super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
 	/* Limit to 4TB as metadata cannot record more than that.
 	 * 4TB == 2^32 KB, or 2*2^32 sectors.
 	 */
-	if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
-		num_sectors = (2ULL << 32) - 2;
+	if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
+	    rdev->mddev->level >= 1)
+		num_sectors = (sector_t)(2ULL << 32) - 2;
 	md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
 		       rdev->sb_page);
 	md_super_wait(rdev->mddev);
@@ -1361,8 +1353,6 @@ static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
 	return cpu_to_le32(csum);
 }
 
-static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
-			    int acknowledged);
 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
 {
 	struct mdp_superblock_1 *sb;
@@ -1487,8 +1477,7 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 			count <<= sb->bblog_shift;
 			if (bb + 1 == 0)
 				break;
-			if (md_set_badblocks(&rdev->badblocks,
-					     sector, count, 1) == 0)
+			if (badblocks_set(&rdev->badblocks, sector, count, 1))
 				return -EINVAL;
 		}
 	} else if (sb->bblog_offset != 0)
@@ -1545,8 +1534,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 		mddev->patch_version = 0;
 		mddev->external = 0;
 		mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
-		mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
-		mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
+		mddev->ctime = le64_to_cpu(sb->ctime);
+		mddev->utime = le64_to_cpu(sb->utime);
 		mddev->level = le32_to_cpu(sb->level);
 		mddev->clevel[0] = 0;
 		mddev->layout = le32_to_cpu(sb->layout);
@@ -1605,6 +1594,11 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 			mddev->new_chunk_sectors = mddev->chunk_sectors;
 		}
 
+		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) {
+			set_bit(MD_HAS_JOURNAL, &mddev->flags);
+			if (mddev->recovery_cp == MaxSector)
+				set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
+		}
 	} else if (mddev->pers == NULL) {
 		/* Insist of good event counter while assembling, except for
 		 * spares (which don't need an event count) */
@@ -1651,8 +1645,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 			}
 			set_bit(Journal, &rdev->flags);
 			rdev->journal_tail = le64_to_cpu(sb->journal_tail);
-			if (mddev->recovery_cp == MaxSector)
-				set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
 			rdev->raid_disk = 0;
 			break;
 		default:
@@ -1672,8 +1664,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 			set_bit(WriteMostly, &rdev->flags);
 		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
 			set_bit(Replacement, &rdev->flags);
-		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
-			set_bit(MD_HAS_JOURNAL, &mddev->flags);
 	} else /* MULTIPATH are always insync */
 		set_bit(In_sync, &rdev->flags);
 
@@ -2017,28 +2007,32 @@ int md_integrity_register(struct mddev *mddev)
 }
 EXPORT_SYMBOL(md_integrity_register);
 
-/* Disable data integrity if non-capable/non-matching disk is being added */
-void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
+/*
+ * Attempt to add an rdev, but only if it is consistent with the current
+ * integrity profile
+ */
+int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
 {
 	struct blk_integrity *bi_rdev;
 	struct blk_integrity *bi_mddev;
+	char name[BDEVNAME_SIZE];
 
 	if (!mddev->gendisk)
-		return;
+		return 0;
 
 	bi_rdev = bdev_get_integrity(rdev->bdev);
 	bi_mddev = blk_get_integrity(mddev->gendisk);
 
 	if (!bi_mddev) /* nothing to do */
-		return;
-	if (rdev->raid_disk < 0) /* skip spares */
-		return;
-	if (bi_rdev && blk_integrity_compare(mddev->gendisk,
-					     rdev->bdev->bd_disk) >= 0)
-		return;
-	WARN_ON_ONCE(!mddev->suspended);
-	printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
-	blk_integrity_unregister(mddev->gendisk);
+		return 0;
+
+	if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
+		printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n",
+				mdname(mddev), bdevname(rdev->bdev, name));
+		return -ENXIO;
+	}
+
+	return 0;
 }
 EXPORT_SYMBOL(md_integrity_add_rdev);
 
@@ -2053,8 +2047,9 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
 		return -EEXIST;
 
 	/* make sure rdev->sectors exceeds mddev->dev_sectors */
-	if (rdev->sectors && (mddev->dev_sectors == 0 ||
-			rdev->sectors < mddev->dev_sectors)) {
+	if (!test_bit(Journal, &rdev->flags) &&
+	    rdev->sectors &&
+	    (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
 		if (mddev->pers) {
 			/* Cannot change size, so fail
 			 * If mddev->level <= 0, then we don't care
@@ -2085,7 +2080,8 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
 		}
 	}
 	rcu_read_unlock();
-	if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
+	if (!test_bit(Journal, &rdev->flags) &&
+	    mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
 		printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
 		       mdname(mddev), mddev->max_disks);
 		return -EBUSY;
@@ -2320,7 +2316,7 @@ repeat:
 			rdev_for_each(rdev, mddev) {
 				if (rdev->badblocks.changed) {
 					rdev->badblocks.changed = 0;
-					md_ack_all_badblocks(&rdev->badblocks);
+					ack_all_badblocks(&rdev->badblocks);
 					md_error(mddev, rdev);
 				}
 				clear_bit(Blocked, &rdev->flags);
@@ -2334,7 +2330,7 @@ repeat:
 
 	spin_lock(&mddev->lock);
 
-	mddev->utime = get_seconds();
+	mddev->utime = ktime_get_real_seconds();
 
 	if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
 		force_change = 1;
@@ -2446,7 +2442,7 @@ repeat:
 			clear_bit(Blocked, &rdev->flags);
 
 		if (any_badblocks_changed)
-			md_ack_all_badblocks(&rdev->badblocks);
+			ack_all_badblocks(&rdev->badblocks);
 		clear_bit(BlockedBadBlocks, &rdev->flags);
 		wake_up(&rdev->blocked_wait);
 	}
@@ -2460,15 +2456,20 @@ static int add_bound_rdev(struct md_rdev *rdev)
 {
 	struct mddev *mddev = rdev->mddev;
 	int err = 0;
+	bool add_journal = test_bit(Journal, &rdev->flags);
 
-	if (!mddev->pers->hot_remove_disk) {
+	if (!mddev->pers->hot_remove_disk || add_journal) {
 		/* If there is hot_add_disk but no hot_remove_disk
 		 * then added disks for geometry changes,
 		 * and should be added immediately.
 		 */
 		super_types[mddev->major_version].
 			validate_super(mddev, rdev);
+		if (add_journal)
+			mddev_suspend(mddev);
 		err = mddev->pers->hot_add_disk(mddev, rdev);
+		if (add_journal)
+			mddev_resume(mddev);
 		if (err) {
 			unbind_rdev_from_array(rdev);
 			export_rdev(rdev);
@@ -3054,11 +3055,17 @@ static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_
 static struct rdev_sysfs_entry rdev_recovery_start =
 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
 
-static ssize_t
-badblocks_show(struct badblocks *bb, char *page, int unack);
-static ssize_t
-badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
-
+/* sysfs access to bad-blocks list.
+ * We present two files.
+ * 'bad-blocks' lists sector numbers and lengths of ranges that
+ *    are recorded as bad.  The list is truncated to fit within
+ *    the one-page limit of sysfs.
+ *    Writing "sector length" to this file adds an acknowledged
+ *    bad block list.
+ * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
+ *    been acknowledged.  Writing to this file adds bad blocks
+ *    without acknowledging them.  This is largely for testing.
+ */
 static ssize_t bb_show(struct md_rdev *rdev, char *page)
 {
 	return badblocks_show(&rdev->badblocks, page, 0);
@@ -3173,14 +3180,7 @@ int md_rdev_init(struct md_rdev *rdev)
 	 * This reserves the space even on arrays where it cannot
 	 * be used - I wonder if that matters
 	 */
-	rdev->badblocks.count = 0;
-	rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
-	rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	seqlock_init(&rdev->badblocks.lock);
-	if (rdev->badblocks.page == NULL)
-		return -ENOMEM;
-
-	return 0;
+	return badblocks_init(&rdev->badblocks, 0);
 }
 EXPORT_SYMBOL_GPL(md_rdev_init);
 /*
@@ -5303,7 +5303,6 @@ int md_run(struct mddev *mddev)
 	smp_wmb();
 	spin_lock(&mddev->lock);
 	mddev->pers = pers;
-	mddev->ready = 1;
 	spin_unlock(&mddev->lock);
 	rdev_for_each(rdev, mddev)
 		if (rdev->raid_disk >= 0)
@@ -5503,7 +5502,6 @@ static void __md_stop(struct mddev *mddev)
 	/* Ensure ->event_work is done */
 	flush_workqueue(md_misc_wq);
 	spin_lock(&mddev->lock);
-	mddev->ready = 0;
 	mddev->pers = NULL;
 	spin_unlock(&mddev->lock);
 	pers->free(mddev, mddev->private);
@@ -5841,7 +5839,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
 	info.major_version = mddev->major_version;
 	info.minor_version = mddev->minor_version;
 	info.patch_version = MD_PATCHLEVEL_VERSION;
-	info.ctime         = mddev->ctime;
+	info.ctime         = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
 	info.level         = mddev->level;
 	info.size          = mddev->dev_sectors / 2;
 	if (info.size != mddev->dev_sectors / 2) /* overflow */
@@ -5851,7 +5849,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
 	info.md_minor      = mddev->md_minor;
 	info.not_persistent= !mddev->persistent;
 
-	info.utime         = mddev->utime;
+	info.utime         = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
 	info.state         = 0;
 	if (mddev->in_sync)
 		info.state = (1<<MD_SB_CLEAN);
@@ -6042,8 +6040,23 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
 		else
 			clear_bit(WriteMostly, &rdev->flags);
 
-		if (info->state & (1<<MD_DISK_JOURNAL))
+		if (info->state & (1<<MD_DISK_JOURNAL)) {
+			struct md_rdev *rdev2;
+			bool has_journal = false;
+
+			/* make sure no existing journal disk */
+			rdev_for_each(rdev2, mddev) {
+				if (test_bit(Journal, &rdev2->flags)) {
+					has_journal = true;
+					break;
+				}
+			}
+			if (has_journal) {
+				export_rdev(rdev);
+				return -EBUSY;
+			}
 			set_bit(Journal, &rdev->flags);
+		}
 		/*
 		 * check whether the device shows up in other nodes
 		 */
@@ -6134,15 +6147,11 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
 {
 	char b[BDEVNAME_SIZE];
 	struct md_rdev *rdev;
-	int ret = -1;
 
 	rdev = find_rdev(mddev, dev);
 	if (!rdev)
 		return -ENXIO;
 
-	if (mddev_is_clustered(mddev))
-		ret = md_cluster_ops->metadata_update_start(mddev);
-
 	if (rdev->raid_disk < 0)
 		goto kick_rdev;
 
@@ -6153,7 +6162,7 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
 		goto busy;
 
 kick_rdev:
-	if (mddev_is_clustered(mddev) && ret == 0)
+	if (mddev_is_clustered(mddev))
 		md_cluster_ops->remove_disk(mddev, rdev);
 
 	md_kick_rdev_from_array(rdev);
@@ -6162,9 +6171,6 @@ kick_rdev:
 
 	return 0;
 busy:
-	if (mddev_is_clustered(mddev) && ret == 0)
-		md_cluster_ops->metadata_update_cancel(mddev);
-
 	printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
 		bdevname(rdev->bdev,b), mdname(mddev));
 	return -EBUSY;
@@ -6358,13 +6364,13 @@ static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
 		/* ensure mddev_put doesn't delete this now that there
 		 * is some minimal configuration.
 		 */
-		mddev->ctime         = get_seconds();
+		mddev->ctime         = ktime_get_real_seconds();
 		return 0;
 	}
 	mddev->major_version = MD_MAJOR_VERSION;
 	mddev->minor_version = MD_MINOR_VERSION;
 	mddev->patch_version = MD_PATCHLEVEL_VERSION;
-	mddev->ctime         = get_seconds();
+	mddev->ctime         = ktime_get_real_seconds();
 
 	mddev->level         = info->level;
 	mddev->clevel[0]     = 0;
@@ -6606,6 +6612,19 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				rv = -EINVAL;
 				goto err;
 			}
+			if (mddev->bitmap_info.nodes) {
+				/* hold PW on all the bitmap lock */
+				if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
+					printk("md: can't change bitmap to none since the"
+					       " array is in use by more than one node\n");
+					rv = -EPERM;
+					md_cluster_ops->unlock_all_bitmaps(mddev);
+					goto err;
+				}
+
+				mddev->bitmap_info.nodes = 0;
+				md_cluster_ops->leave(mddev);
+			}
 			mddev->pers->quiesce(mddev, 1);
 			bitmap_destroy(mddev);
 			mddev->pers->quiesce(mddev, 0);
@@ -7184,7 +7203,7 @@ void md_error(struct mddev *mddev, struct md_rdev *rdev)
 	md_wakeup_thread(mddev->thread);
 	if (mddev->event_work.func)
 		queue_work(md_misc_wq, &mddev->event_work);
-	md_new_event_inintr(mddev);
+	md_new_event(mddev);
 }
 EXPORT_SYMBOL(md_error);
 
@@ -7708,7 +7727,7 @@ EXPORT_SYMBOL(md_write_end);
  * attempting a GFP_KERNEL allocation while holding the mddev lock.
  * Must be called with mddev_lock held.
  *
- * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
+ * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
  * is dropped, so return -EAGAIN after notifying userspace.
  */
 int md_allow_write(struct mddev *mddev)
@@ -8173,19 +8192,20 @@ static int remove_and_add_spares(struct mddev *mddev,
 			continue;
 		if (test_bit(Faulty, &rdev->flags))
 			continue;
-		if (test_bit(Journal, &rdev->flags))
-			continue;
-		if (mddev->ro &&
-		    ! (rdev->saved_raid_disk >= 0 &&
-		       !test_bit(Bitmap_sync, &rdev->flags)))
-			continue;
+		if (!test_bit(Journal, &rdev->flags)) {
+			if (mddev->ro &&
+			    ! (rdev->saved_raid_disk >= 0 &&
+			       !test_bit(Bitmap_sync, &rdev->flags)))
+				continue;
 
-		rdev->recovery_offset = 0;
+			rdev->recovery_offset = 0;
+		}
 		if (mddev->pers->
 		    hot_add_disk(mddev, rdev) == 0) {
 			if (sysfs_link_rdev(mddev, rdev))
 				/* failure here is OK */;
-			spares++;
+			if (!test_bit(Journal, &rdev->flags))
+				spares++;
 			md_new_event(mddev);
 			set_bit(MD_CHANGE_DEVS, &mddev->flags);
 		}
@@ -8280,6 +8300,7 @@ void md_check_recovery(struct mddev *mddev)
 		(mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
 		test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
 		test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
+		test_bit(MD_RELOAD_SB, &mddev->flags) ||
 		(mddev->external == 0 && mddev->safemode == 1) ||
 		(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
 		 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
@@ -8318,6 +8339,21 @@ void md_check_recovery(struct mddev *mddev)
 			goto unlock;
 		}
 
+		if (mddev_is_clustered(mddev)) {
+			struct md_rdev *rdev;
+			/* kick the device if another node issued a
+			 * remove disk.
+			 */
+			rdev_for_each(rdev, mddev) {
+				if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
+						rdev->raid_disk < 0)
+					md_kick_rdev_from_array(rdev);
+			}
+
+			if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
+				md_reload_sb(mddev, mddev->good_device_nr);
+		}
+
 		if (!mddev->external) {
 			int did_change = 0;
 			spin_lock(&mddev->lock);
@@ -8489,254 +8525,9 @@ void md_finish_reshape(struct mddev *mddev)
 }
 EXPORT_SYMBOL(md_finish_reshape);
 
-/* Bad block management.
- * We can record which blocks on each device are 'bad' and so just
- * fail those blocks, or that stripe, rather than the whole device.
- * Entries in the bad-block table are 64bits wide.  This comprises:
- * Length of bad-range, in sectors: 0-511 for lengths 1-512
- * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
- *  A 'shift' can be set so that larger blocks are tracked and
- *  consequently larger devices can be covered.
- * 'Acknowledged' flag - 1 bit. - the most significant bit.
- *
- * Locking of the bad-block table uses a seqlock so md_is_badblock
- * might need to retry if it is very unlucky.
- * We will sometimes want to check for bad blocks in a bi_end_io function,
- * so we use the write_seqlock_irq variant.
- *
- * When looking for a bad block we specify a range and want to
- * know if any block in the range is bad.  So we binary-search
- * to the last range that starts at-or-before the given endpoint,
- * (or "before the sector after the target range")
- * then see if it ends after the given start.
- * We return
- *  0 if there are no known bad blocks in the range
- *  1 if there are known bad block which are all acknowledged
- * -1 if there are bad blocks which have not yet been acknowledged in metadata.
- * plus the start/length of the first bad section we overlap.
- */
-int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
-		   sector_t *first_bad, int *bad_sectors)
-{
-	int hi;
-	int lo;
-	u64 *p = bb->page;
-	int rv;
-	sector_t target = s + sectors;
-	unsigned seq;
-
-	if (bb->shift > 0) {
-		/* round the start down, and the end up */
-		s >>= bb->shift;
-		target += (1<<bb->shift) - 1;
-		target >>= bb->shift;
-		sectors = target - s;
-	}
-	/* 'target' is now the first block after the bad range */
-
-retry:
-	seq = read_seqbegin(&bb->lock);
-	lo = 0;
-	rv = 0;
-	hi = bb->count;
-
-	/* Binary search between lo and hi for 'target'
-	 * i.e. for the last range that starts before 'target'
-	 */
-	/* INVARIANT: ranges before 'lo' and at-or-after 'hi'
-	 * are known not to be the last range before target.
-	 * VARIANT: hi-lo is the number of possible
-	 * ranges, and decreases until it reaches 1
-	 */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a < target)
-			/* This could still be the one, earlier ranges
-			 * could not. */
-			lo = mid;
-		else
-			/* This and later ranges are definitely out. */
-			hi = mid;
-	}
-	/* 'lo' might be the last that started before target, but 'hi' isn't */
-	if (hi > lo) {
-		/* need to check all range that end after 's' to see if
-		 * any are unacknowledged.
-		 */
-		while (lo >= 0 &&
-		       BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
-			if (BB_OFFSET(p[lo]) < target) {
-				/* starts before the end, and finishes after
-				 * the start, so they must overlap
-				 */
-				if (rv != -1 && BB_ACK(p[lo]))
-					rv = 1;
-				else
-					rv = -1;
-				*first_bad = BB_OFFSET(p[lo]);
-				*bad_sectors = BB_LEN(p[lo]);
-			}
-			lo--;
-		}
-	}
-
-	if (read_seqretry(&bb->lock, seq))
-		goto retry;
-
-	return rv;
-}
-EXPORT_SYMBOL_GPL(md_is_badblock);
-
-/*
- * Add a range of bad blocks to the table.
- * This might extend the table, or might contract it
- * if two adjacent ranges can be merged.
- * We binary-search to find the 'insertion' point, then
- * decide how best to handle it.
- */
-static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
-			    int acknowledged)
-{
-	u64 *p;
-	int lo, hi;
-	int rv = 1;
-	unsigned long flags;
-
-	if (bb->shift < 0)
-		/* badblocks are disabled */
-		return 0;
-
-	if (bb->shift) {
-		/* round the start down, and the end up */
-		sector_t next = s + sectors;
-		s >>= bb->shift;
-		next += (1<<bb->shift) - 1;
-		next >>= bb->shift;
-		sectors = next - s;
-	}
-
-	write_seqlock_irqsave(&bb->lock, flags);
-
-	p = bb->page;
-	lo = 0;
-	hi = bb->count;
-	/* Find the last range that starts at-or-before 's' */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a <= s)
-			lo = mid;
-		else
-			hi = mid;
-	}
-	if (hi > lo && BB_OFFSET(p[lo]) > s)
-		hi = lo;
-
-	if (hi > lo) {
-		/* we found a range that might merge with the start
-		 * of our new range
-		 */
-		sector_t a = BB_OFFSET(p[lo]);
-		sector_t e = a + BB_LEN(p[lo]);
-		int ack = BB_ACK(p[lo]);
-		if (e >= s) {
-			/* Yes, we can merge with a previous range */
-			if (s == a && s + sectors >= e)
-				/* new range covers old */
-				ack = acknowledged;
-			else
-				ack = ack && acknowledged;
-
-			if (e < s + sectors)
-				e = s + sectors;
-			if (e - a <= BB_MAX_LEN) {
-				p[lo] = BB_MAKE(a, e-a, ack);
-				s = e;
-			} else {
-				/* does not all fit in one range,
-				 * make p[lo] maximal
-				 */
-				if (BB_LEN(p[lo]) != BB_MAX_LEN)
-					p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
-				s = a + BB_MAX_LEN;
-			}
-			sectors = e - s;
-		}
-	}
-	if (sectors && hi < bb->count) {
-		/* 'hi' points to the first range that starts after 's'.
-		 * Maybe we can merge with the start of that range */
-		sector_t a = BB_OFFSET(p[hi]);
-		sector_t e = a + BB_LEN(p[hi]);
-		int ack = BB_ACK(p[hi]);
-		if (a <= s + sectors) {
-			/* merging is possible */
-			if (e <= s + sectors) {
-				/* full overlap */
-				e = s + sectors;
-				ack = acknowledged;
-			} else
-				ack = ack && acknowledged;
-
-			a = s;
-			if (e - a <= BB_MAX_LEN) {
-				p[hi] = BB_MAKE(a, e-a, ack);
-				s = e;
-			} else {
-				p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
-				s = a + BB_MAX_LEN;
-			}
-			sectors = e - s;
-			lo = hi;
-			hi++;
-		}
-	}
-	if (sectors == 0 && hi < bb->count) {
-		/* we might be able to combine lo and hi */
-		/* Note: 's' is at the end of 'lo' */
-		sector_t a = BB_OFFSET(p[hi]);
-		int lolen = BB_LEN(p[lo]);
-		int hilen = BB_LEN(p[hi]);
-		int newlen = lolen + hilen - (s - a);
-		if (s >= a && newlen < BB_MAX_LEN) {
-			/* yes, we can combine them */
-			int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
-			p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
-			memmove(p + hi, p + hi + 1,
-				(bb->count - hi - 1) * 8);
-			bb->count--;
-		}
-	}
-	while (sectors) {
-		/* didn't merge (it all).
-		 * Need to add a range just before 'hi' */
-		if (bb->count >= MD_MAX_BADBLOCKS) {
-			/* No room for more */
-			rv = 0;
-			break;
-		} else {
-			int this_sectors = sectors;
-			memmove(p + hi + 1, p + hi,
-				(bb->count - hi) * 8);
-			bb->count++;
-
-			if (this_sectors > BB_MAX_LEN)
-				this_sectors = BB_MAX_LEN;
-			p[hi] = BB_MAKE(s, this_sectors, acknowledged);
-			sectors -= this_sectors;
-			s += this_sectors;
-		}
-	}
-
-	bb->changed = 1;
-	if (!acknowledged)
-		bb->unacked_exist = 1;
-	write_sequnlock_irqrestore(&bb->lock, flags);
-
-	return rv;
-}
+/* Bad block management */
 
+/* Returns 1 on success, 0 on failure */
 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
 		       int is_new)
 {
@@ -8745,114 +8536,19 @@ int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
 		s += rdev->new_data_offset;
 	else
 		s += rdev->data_offset;
-	rv = md_set_badblocks(&rdev->badblocks,
-			      s, sectors, 0);
-	if (rv) {
+	rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
+	if (rv == 0) {
 		/* Make sure they get written out promptly */
 		sysfs_notify_dirent_safe(rdev->sysfs_state);
 		set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
 		set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
 		md_wakeup_thread(rdev->mddev->thread);
-	}
-	return rv;
+		return 1;
+	} else
+		return 0;
 }
 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
 
-/*
- * Remove a range of bad blocks from the table.
- * This may involve extending the table if we spilt a region,
- * but it must not fail.  So if the table becomes full, we just
- * drop the remove request.
- */
-static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
-{
-	u64 *p;
-	int lo, hi;
-	sector_t target = s + sectors;
-	int rv = 0;
-
-	if (bb->shift > 0) {
-		/* When clearing we round the start up and the end down.
-		 * This should not matter as the shift should align with
-		 * the block size and no rounding should ever be needed.
-		 * However it is better the think a block is bad when it
-		 * isn't than to think a block is not bad when it is.
-		 */
-		s += (1<<bb->shift) - 1;
-		s >>= bb->shift;
-		target >>= bb->shift;
-		sectors = target - s;
-	}
-
-	write_seqlock_irq(&bb->lock);
-
-	p = bb->page;
-	lo = 0;
-	hi = bb->count;
-	/* Find the last range that starts before 'target' */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a < target)
-			lo = mid;
-		else
-			hi = mid;
-	}
-	if (hi > lo) {
-		/* p[lo] is the last range that could overlap the
-		 * current range.  Earlier ranges could also overlap,
-		 * but only this one can overlap the end of the range.
-		 */
-		if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
-			/* Partial overlap, leave the tail of this range */
-			int ack = BB_ACK(p[lo]);
-			sector_t a = BB_OFFSET(p[lo]);
-			sector_t end = a + BB_LEN(p[lo]);
-
-			if (a < s) {
-				/* we need to split this range */
-				if (bb->count >= MD_MAX_BADBLOCKS) {
-					rv = -ENOSPC;
-					goto out;
-				}
-				memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
-				bb->count++;
-				p[lo] = BB_MAKE(a, s-a, ack);
-				lo++;
-			}
-			p[lo] = BB_MAKE(target, end - target, ack);
-			/* there is no longer an overlap */
-			hi = lo;
-			lo--;
-		}
-		while (lo >= 0 &&
-		       BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
-			/* This range does overlap */
-			if (BB_OFFSET(p[lo]) < s) {
-				/* Keep the early parts of this range. */
-				int ack = BB_ACK(p[lo]);
-				sector_t start = BB_OFFSET(p[lo]);
-				p[lo] = BB_MAKE(start, s - start, ack);
-				/* now low doesn't overlap, so.. */
-				break;
-			}
-			lo--;
-		}
-		/* 'lo' is strictly before, 'hi' is strictly after,
-		 * anything between needs to be discarded
-		 */
-		if (hi - lo > 1) {
-			memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
-			bb->count -= (hi - lo - 1);
-		}
-	}
-
-	bb->changed = 1;
-out:
-	write_sequnlock_irq(&bb->lock);
-	return rv;
-}
-
 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
 			 int is_new)
 {
@@ -8860,133 +8556,11 @@ int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
 		s += rdev->new_data_offset;
 	else
 		s += rdev->data_offset;
-	return md_clear_badblocks(&rdev->badblocks,
+	return badblocks_clear(&rdev->badblocks,
 				  s, sectors);
 }
 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
 
-/*
- * Acknowledge all bad blocks in a list.
- * This only succeeds if ->changed is clear.  It is used by
- * in-kernel metadata updates
- */
-void md_ack_all_badblocks(struct badblocks *bb)
-{
-	if (bb->page == NULL || bb->changed)
-		/* no point even trying */
-		return;
-	write_seqlock_irq(&bb->lock);
-
-	if (bb->changed == 0 && bb->unacked_exist) {
-		u64 *p = bb->page;
-		int i;
-		for (i = 0; i < bb->count ; i++) {
-			if (!BB_ACK(p[i])) {
-				sector_t start = BB_OFFSET(p[i]);
-				int len = BB_LEN(p[i]);
-				p[i] = BB_MAKE(start, len, 1);
-			}
-		}
-		bb->unacked_exist = 0;
-	}
-	write_sequnlock_irq(&bb->lock);
-}
-EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
-
-/* sysfs access to bad-blocks list.
- * We present two files.
- * 'bad-blocks' lists sector numbers and lengths of ranges that
- *    are recorded as bad.  The list is truncated to fit within
- *    the one-page limit of sysfs.
- *    Writing "sector length" to this file adds an acknowledged
- *    bad block list.
- * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
- *    been acknowledged.  Writing to this file adds bad blocks
- *    without acknowledging them.  This is largely for testing.
- */
-
-static ssize_t
-badblocks_show(struct badblocks *bb, char *page, int unack)
-{
-	size_t len;
-	int i;
-	u64 *p = bb->page;
-	unsigned seq;
-
-	if (bb->shift < 0)
-		return 0;
-
-retry:
-	seq = read_seqbegin(&bb->lock);
-
-	len = 0;
-	i = 0;
-
-	while (len < PAGE_SIZE && i < bb->count) {
-		sector_t s = BB_OFFSET(p[i]);
-		unsigned int length = BB_LEN(p[i]);
-		int ack = BB_ACK(p[i]);
-		i++;
-
-		if (unack && ack)
-			continue;
-
-		len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
-				(unsigned long long)s << bb->shift,
-				length << bb->shift);
-	}
-	if (unack && len == 0)
-		bb->unacked_exist = 0;
-
-	if (read_seqretry(&bb->lock, seq))
-		goto retry;
-
-	return len;
-}
-
-#define DO_DEBUG 1
-
-static ssize_t
-badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
-{
-	unsigned long long sector;
-	int length;
-	char newline;
-#ifdef DO_DEBUG
-	/* Allow clearing via sysfs *only* for testing/debugging.
-	 * Normally only a successful write may clear a badblock
-	 */
-	int clear = 0;
-	if (page[0] == '-') {
-		clear = 1;
-		page++;
-	}
-#endif /* DO_DEBUG */
-
-	switch (sscanf(page, "%llu %d%c", &sector, &length, &newline)) {
-	case 3:
-		if (newline != '\n')
-			return -EINVAL;
-	case 2:
-		if (length <= 0)
-			return -EINVAL;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-#ifdef DO_DEBUG
-	if (clear) {
-		md_clear_badblocks(bb, sector, length);
-		return len;
-	}
-#endif /* DO_DEBUG */
-	if (md_set_badblocks(bb, sector, length, !unack))
-		return len;
-	else
-		return -ENOSPC;
-}
-
 static int md_notify_reboot(struct notifier_block *this,
 			    unsigned long code, void *x)
 {
@@ -9101,7 +8675,6 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 				ret = remove_and_add_spares(mddev, rdev2);
 				pr_info("Activated spare: %s\n",
 						bdevname(rdev2->bdev,b));
-				continue;
 			}
 			/* device faulty
 			 * We just want to do the minimum to mark the disk