Merge tag 'for-5.19/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix DM core's bioset initialization so that blk integrity pool is
   properly setup. Remove now unused bioset_init_from_src.

 - Fix DM zoned hang from locking imbalance due to needless check in
   clone_endio().

* tag 'for-5.19/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: fix zoned locking imbalance due to needless check in clone_endio
  block: remove bioset_init_from_src
  dm: fix bio_set allocation

Author: torvalds

block/bio.c

@@ -1747,26 +1747,6 @@ int bioset_init(struct bio_set *bs,
 }
 EXPORT_SYMBOL(bioset_init);
 
-/*
- * Initialize and setup a new bio_set, based on the settings from
- * another bio_set.
- */
-int bioset_init_from_src(struct bio_set *bs, struct bio_set *src)
-{
-	int flags;
-
-	flags = 0;
-	if (src->bvec_pool.min_nr)
-		flags |= BIOSET_NEED_BVECS;
-	if (src->rescue_workqueue)
-		flags |= BIOSET_NEED_RESCUER;
-	if (src->cache)
-		flags |= BIOSET_PERCPU_CACHE;
-
-	return bioset_init(bs, src->bio_pool.min_nr, src->front_pad, flags);
-}
-EXPORT_SYMBOL(bioset_init_from_src);
-
 static int __init init_bio(void)
 {
 	int i;

drivers/md/dm-core.h

@@ -33,6 +33,14 @@ struct dm_kobject_holder {
  * access their members!
  */
 
+/*
+ * For mempools pre-allocation at the table loading time.
+ */
+struct dm_md_mempools {
+	struct bio_set bs;
+	struct bio_set io_bs;
+};
+
 struct mapped_device {
 	struct mutex suspend_lock;
 
@@ -110,8 +118,7 @@ struct mapped_device {
 	/*
 	 * io objects are allocated from here.
 	 */
-	struct bio_set io_bs;
-	struct bio_set bs;
+	struct dm_md_mempools *mempools;
 
 	/* kobject and completion */
 	struct dm_kobject_holder kobj_holder;

drivers/md/dm-rq.c

@@ -319,7 +319,7 @@ static int setup_clone(struct request *clone, struct request *rq,
 {
 	int r;
 
-	r = blk_rq_prep_clone(clone, rq, &tio->md->bs, gfp_mask,
+	r = blk_rq_prep_clone(clone, rq, &tio->md->mempools->bs, gfp_mask,
 			      dm_rq_bio_constructor, tio);
 	if (r)
 		return r;

drivers/md/dm-table.c

@@ -1038,17 +1038,6 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
 	return 0;
 }
 
-void dm_table_free_md_mempools(struct dm_table *t)
-{
-	dm_free_md_mempools(t->mempools);
-	t->mempools = NULL;
-}
-
-struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t)
-{
-	return t->mempools;
-}
-
 static int setup_indexes(struct dm_table *t)
 {
 	int i;

drivers/md/dm.c

@@ -136,14 +136,6 @@ static int get_swap_bios(void)
 	return latch;
 }
 
-/*
- * For mempools pre-allocation at the table loading time.
- */
-struct dm_md_mempools {
-	struct bio_set bs;
-	struct bio_set io_bs;
-};
-
 struct table_device {
 	struct list_head list;
 	refcount_t count;
@@ -581,7 +573,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
 	struct dm_target_io *tio;
 	struct bio *clone;
 
-	clone = bio_alloc_clone(NULL, bio, GFP_NOIO, &md->io_bs);
+	clone = bio_alloc_clone(NULL, bio, GFP_NOIO, &md->mempools->io_bs);
 	/* Set default bdev, but target must bio_set_dev() before issuing IO */
 	clone->bi_bdev = md->disk->part0;
 
@@ -628,7 +620,8 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
 	} else {
 		struct mapped_device *md = ci->io->md;
 
-		clone = bio_alloc_clone(NULL, ci->bio, gfp_mask, &md->bs);
+		clone = bio_alloc_clone(NULL, ci->bio, gfp_mask,
+					&md->mempools->bs);
 		if (!clone)
 			return NULL;
 		/* Set default bdev, but target must bio_set_dev() before issuing IO */
@@ -1023,23 +1016,19 @@ static void clone_endio(struct bio *bio)
 	struct dm_io *io = tio->io;
 	struct mapped_device *md = io->md;
 
-	if (likely(bio->bi_bdev != md->disk->part0)) {
-		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
-
-		if (unlikely(error == BLK_STS_TARGET)) {
-			if (bio_op(bio) == REQ_OP_DISCARD &&
-			    !bdev_max_discard_sectors(bio->bi_bdev))
-				disable_discard(md);
-			else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
-				 !q->limits.max_write_zeroes_sectors)
-				disable_write_zeroes(md);
-		}
-
-		if (static_branch_unlikely(&zoned_enabled) &&
-		    unlikely(blk_queue_is_zoned(q)))
-			dm_zone_endio(io, bio);
+	if (unlikely(error == BLK_STS_TARGET)) {
+		if (bio_op(bio) == REQ_OP_DISCARD &&
+		    !bdev_max_discard_sectors(bio->bi_bdev))
+			disable_discard(md);
+		else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
+			 !bdev_write_zeroes_sectors(bio->bi_bdev))
+			disable_write_zeroes(md);
 	}
 
+	if (static_branch_unlikely(&zoned_enabled) &&
+	    unlikely(blk_queue_is_zoned(bdev_get_queue(bio->bi_bdev))))
+		dm_zone_endio(io, bio);
+
 	if (endio) {
 		int r = endio(ti, bio, &error);
 		switch (r) {
@@ -1876,8 +1865,7 @@ static void cleanup_mapped_device(struct mapped_device *md)
 {
 	if (md->wq)
 		destroy_workqueue(md->wq);
-	bioset_exit(&md->bs);
-	bioset_exit(&md->io_bs);
+	dm_free_md_mempools(md->mempools);
 
 	if (md->dax_dev) {
 		dax_remove_host(md->disk);
@@ -2049,48 +2037,6 @@ static void free_dev(struct mapped_device *md)
 	kvfree(md);
 }
 
-static int __bind_mempools(struct mapped_device *md, struct dm_table *t)
-{
-	struct dm_md_mempools *p = dm_table_get_md_mempools(t);
-	int ret = 0;
-
-	if (dm_table_bio_based(t)) {
-		/*
-		 * The md may already have mempools that need changing.
-		 * If so, reload bioset because front_pad may have changed
-		 * because a different table was loaded.
-		 */
-		bioset_exit(&md->bs);
-		bioset_exit(&md->io_bs);
-
-	} else if (bioset_initialized(&md->bs)) {
-		/*
-		 * There's no need to reload with request-based dm
-		 * because the size of front_pad doesn't change.
-		 * Note for future: If you are to reload bioset,
-		 * prep-ed requests in the queue may refer
-		 * to bio from the old bioset, so you must walk
-		 * through the queue to unprep.
-		 */
-		goto out;
-	}
-
-	BUG_ON(!p ||
-	       bioset_initialized(&md->bs) ||
-	       bioset_initialized(&md->io_bs));
-
-	ret = bioset_init_from_src(&md->bs, &p->bs);
-	if (ret)
-		goto out;
-	ret = bioset_init_from_src(&md->io_bs, &p->io_bs);
-	if (ret)
-		bioset_exit(&md->bs);
-out:
-	/* mempool bind completed, no longer need any mempools in the table */
-	dm_table_free_md_mempools(t);
-	return ret;
-}
-
 /*
  * Bind a table to the device.
  */
@@ -2144,12 +2090,28 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
 		 * immutable singletons - used to optimize dm_mq_queue_rq.
 		 */
 		md->immutable_target = dm_table_get_immutable_target(t);
-	}
 
-	ret = __bind_mempools(md, t);
-	if (ret) {
-		old_map = ERR_PTR(ret);
-		goto out;
+		/*
+		 * There is no need to reload with request-based dm because the
+		 * size of front_pad doesn't change.
+		 *
+		 * Note for future: If you are to reload bioset, prep-ed
+		 * requests in the queue may refer to bio from the old bioset,
+		 * so you must walk through the queue to unprep.
+		 */
+		if (!md->mempools) {
+			md->mempools = t->mempools;
+			t->mempools = NULL;
+		}
+	} else {
+		/*
+		 * The md may already have mempools that need changing.
+		 * If so, reload bioset because front_pad may have changed
+		 * because a different table was loaded.
+		 */
+		dm_free_md_mempools(md->mempools);
+		md->mempools = t->mempools;
+		t->mempools = NULL;
 	}
 
 	ret = dm_table_set_restrictions(t, md->queue, limits);

drivers/md/dm.h

@@ -71,8 +71,6 @@ struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
 bool dm_table_bio_based(struct dm_table *t);
 bool dm_table_request_based(struct dm_table *t);
-void dm_table_free_md_mempools(struct dm_table *t);
-struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
 
 void dm_lock_md_type(struct mapped_device *md);
 void dm_unlock_md_type(struct mapped_device *md);

include/linux/bio.h

@@ -403,7 +403,6 @@ enum {
 extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags);
 extern void bioset_exit(struct bio_set *);
 extern int biovec_init_pool(mempool_t *pool, int pool_entries);
-extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
 
 struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs,
 			     unsigned int opf, gfp_t gfp_mask,