Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (33 commits)
  dm mpath: support discard
  dm stripe: support discards
  dm: split discard requests on target boundaries
  dm stripe: optimize sector division
  dm stripe: move sector translation to a function
  dm: error return error for discards
  dm delay: support discard
  dm: zero silently drop discards
  dm: use dm_target_offset macro
  dm: factor out max_io_len_target_boundary
  dm: use common __issue_target_request for flush and discard support
  dm: linear support discard
  dm crypt: simplify crypt_ctr
  dm crypt: simplify crypt_config destruction logic
  dm: allow autoloading of dm mod
  dm: rename map_info flush_request to target_request_nr
  dm ioctl: refactor dm_table_complete
  dm snapshot: implement merge
  dm: do not initialise full request queue when bio based
  dm ioctl: make bio or request based device type immutable
  ...

16 files changed, 803 insertions, 382 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 3bdbb611570..368e8e98f70 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -107,11 +107,10 @@ struct crypt_config {
 	struct workqueue_struct *io_queue;
 	struct workqueue_struct *crypt_queue;
 
-	/*
-	 * crypto related data
-	 */
+	char *cipher;
+	char *cipher_mode;
+
 	struct crypt_iv_operations *iv_gen_ops;
-	char *iv_mode;
 	union {
 		struct iv_essiv_private essiv;
 		struct iv_benbi_private benbi;
@@ -135,8 +134,6 @@ struct crypt_config {
 	unsigned int dmreq_start;
 	struct ablkcipher_request *req;
 
-	char cipher[CRYPTO_MAX_ALG_NAME];
-	char chainmode[CRYPTO_MAX_ALG_NAME];
 	struct crypto_ablkcipher *tfm;
 	unsigned long flags;
 	unsigned int key_size;
@@ -999,82 +996,135 @@ static int crypt_wipe_key(struct crypt_config *cc)
 	return crypto_ablkcipher_setkey(cc->tfm, cc->key, cc->key_size);
 }
 
-/*
- * Construct an encryption mapping:
- * <cipher> <key> <iv_offset> <dev_path> <start>
- */
-static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
+static void crypt_dtr(struct dm_target *ti)
 {
-	struct crypt_config *cc;
-	struct crypto_ablkcipher *tfm;
-	char *tmp;
-	char *cipher;
-	char *chainmode;
-	char *ivmode;
-	char *ivopts;
-	unsigned int key_size;
-	unsigned long long tmpll;
+	struct crypt_config *cc = ti->private;
 
-	if (argc != 5) {
-		ti->error = "Not enough arguments";
+	ti->private = NULL;
+
+	if (!cc)
+		return;
+
+	if (cc->io_queue)
+		destroy_workqueue(cc->io_queue);
+	if (cc->crypt_queue)
+		destroy_workqueue(cc->crypt_queue);
+
+	if (cc->bs)
+		bioset_free(cc->bs);
+
+	if (cc->page_pool)
+		mempool_destroy(cc->page_pool);
+	if (cc->req_pool)
+		mempool_destroy(cc->req_pool);
+	if (cc->io_pool)
+		mempool_destroy(cc->io_pool);
+
+	if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
+		cc->iv_gen_ops->dtr(cc);
+
+	if (cc->tfm && !IS_ERR(cc->tfm))
+		crypto_free_ablkcipher(cc->tfm);
+
+	if (cc->dev)
+		dm_put_device(ti, cc->dev);
+
+	kzfree(cc->cipher);
+	kzfree(cc->cipher_mode);
+
+	/* Must zero key material before freeing */
+	kzfree(cc);
+}
+
+static int crypt_ctr_cipher(struct dm_target *ti,
+			    char *cipher_in, char *key)
+{
+	struct crypt_config *cc = ti->private;
+	char *tmp, *cipher, *chainmode, *ivmode, *ivopts;
+	char *cipher_api = NULL;
+	int ret = -EINVAL;
+
+	/* Convert to crypto api definition? */
+	if (strchr(cipher_in, '(')) {
+		ti->error = "Bad cipher specification";
 		return -EINVAL;
 	}
 
-	tmp = argv[0];
+	/*
+	 * Legacy dm-crypt cipher specification
+	 * cipher-mode-iv:ivopts
+	 */
+	tmp = cipher_in;
 	cipher = strsep(&tmp, "-");
+
+	cc->cipher = kstrdup(cipher, GFP_KERNEL);
+	if (!cc->cipher)
+		goto bad_mem;
+
+	if (tmp) {
+		cc->cipher_mode = kstrdup(tmp, GFP_KERNEL);
+		if (!cc->cipher_mode)
+			goto bad_mem;
+	}
+
 	chainmode = strsep(&tmp, "-");
 	ivopts = strsep(&tmp, "-");
 	ivmode = strsep(&ivopts, ":");
 
 	if (tmp)
-		DMWARN("Unexpected additional cipher options");
-
-	key_size = strlen(argv[1]) >> 1;
-
- 	cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
-	if (cc == NULL) {
-		ti->error =
-			"Cannot allocate transparent encryption context";
-		return -ENOMEM;
-	}
+		DMWARN("Ignoring unexpected additional cipher options");
 
-	/* Compatibility mode for old dm-crypt cipher strings */
-	if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) {
+	/* Compatibility mode for old dm-crypt mappings */
+	if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) {
+		kfree(cc->cipher_mode);
+		cc->cipher_mode = kstrdup("cbc-plain", GFP_KERNEL);
 		chainmode = "cbc";
 		ivmode = "plain";
 	}
 
 	if (strcmp(chainmode, "ecb") && !ivmode) {
-		ti->error = "This chaining mode requires an IV mechanism";
-		goto bad_cipher;
+		ti->error = "IV mechanism required";
+		return -EINVAL;
 	}
 
-	if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)",
-		     chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) {
-		ti->error = "Chain mode + cipher name is too long";
-		goto bad_cipher;
+	cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
+	if (!cipher_api)
+		goto bad_mem;
+
+	ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
+		       "%s(%s)", chainmode, cipher);
+	if (ret < 0) {
+		kfree(cipher_api);
+		goto bad_mem;
 	}
 
-	tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0);
-	if (IS_ERR(tfm)) {
+	/* Allocate cipher */
+	cc->tfm = crypto_alloc_ablkcipher(cipher_api, 0, 0);
+	if (IS_ERR(cc->tfm)) {
+		ret = PTR_ERR(cc->tfm);
 		ti->error = "Error allocating crypto tfm";
-		goto bad_cipher;
+		goto bad;
 	}
 
-	strcpy(cc->cipher, cipher);
-	strcpy(cc->chainmode, chainmode);
-	cc->tfm = tfm;
-
-	if (crypt_set_key(cc, argv[1]) < 0) {
+	/* Initialize and set key */
+	ret = crypt_set_key(cc, key);
+	if (ret < 0) {
 		ti->error = "Error decoding and setting key";
-		goto bad_ivmode;
+		goto bad;
 	}
 
-	/*
-	 * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi".
-	 * See comments at iv code
-	 */
+	/* Initialize IV */
+	cc->iv_size = crypto_ablkcipher_ivsize(cc->tfm);
+	if (cc->iv_size)
+		/* at least a 64 bit sector number should fit in our buffer */
+		cc->iv_size = max(cc->iv_size,
+				  (unsigned int)(sizeof(u64) / sizeof(u8)));
+	else if (ivmode) {
+		DMWARN("Selected cipher does not support IVs");
+		ivmode = NULL;
+	}
 
+	/* Choose ivmode, see comments at iv code. */
 	if (ivmode == NULL)
 		cc->iv_gen_ops = NULL;
 	else if (strcmp(ivmode, "plain") == 0)
@@ -1088,159 +1138,138 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	else if (strcmp(ivmode, "null") == 0)
 		cc->iv_gen_ops = &crypt_iv_null_ops;
 	else {
+		ret = -EINVAL;
 		ti->error = "Invalid IV mode";
-		goto bad_ivmode;
+		goto bad;
 	}
 
-	if (cc->iv_gen_ops && cc->iv_gen_ops->ctr &&
-	    cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
-		goto bad_ivmode;
-
-	if (cc->iv_gen_ops && cc->iv_gen_ops->init &&
-	    cc->iv_gen_ops->init(cc) < 0) {
-		ti->error = "Error initialising IV";
-		goto bad_slab_pool;
+	/* Allocate IV */
+	if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
+		ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
+		if (ret < 0) {
+			ti->error = "Error creating IV";
+			goto bad;
+		}
 	}
 
-	cc->iv_size = crypto_ablkcipher_ivsize(tfm);
-	if (cc->iv_size)
-		/* at least a 64 bit sector number should fit in our buffer */
-		cc->iv_size = max(cc->iv_size,
-				  (unsigned int)(sizeof(u64) / sizeof(u8)));
-	else {
-		if (cc->iv_gen_ops) {
-			DMWARN("Selected cipher does not support IVs");
-			if (cc->iv_gen_ops->dtr)
-				cc->iv_gen_ops->dtr(cc);
-			cc->iv_gen_ops = NULL;
+	/* Initialize IV (set keys for ESSIV etc) */
+	if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
+		ret = cc->iv_gen_ops->init(cc);
+		if (ret < 0) {
+			ti->error = "Error initialising IV";
+			goto bad;
 		}
 	}
 
+	ret = 0;
+bad:
+	kfree(cipher_api);
+	return ret;
+
+bad_mem:
+	ti->error = "Cannot allocate cipher strings";
+	return -ENOMEM;
+}
+
+/*
+ * Construct an encryption mapping:
+ * <cipher> <key> <iv_offset> <dev_path> <start>
+ */
+static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
+{
+	struct crypt_config *cc;
+	unsigned int key_size;
+	unsigned long long tmpll;
+	int ret;
+
+	if (argc != 5) {
+		ti->error = "Not enough arguments";
+		return -EINVAL;
+	}
+
+	key_size = strlen(argv[1]) >> 1;
+
+	cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
+	if (!cc) {
+		ti->error = "Cannot allocate encryption context";
+		return -ENOMEM;
+	}
+
+	ti->private = cc;
+	ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
+	if (ret < 0)
+		goto bad;
+
+	ret = -ENOMEM;
 	cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool);
 	if (!cc->io_pool) {
 		ti->error = "Cannot allocate crypt io mempool";
-		goto bad_slab_pool;
+		goto bad;
 	}
 
 	cc->dmreq_start = sizeof(struct ablkcipher_request);
-	cc->dmreq_start += crypto_ablkcipher_reqsize(tfm);
+	cc->dmreq_start += crypto_ablkcipher_reqsize(cc->tfm);
 	cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
-	cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) &
+	cc->dmreq_start += crypto_ablkcipher_alignmask(cc->tfm) &
 			   ~(crypto_tfm_ctx_alignment() - 1);
 
 	cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
 			sizeof(struct dm_crypt_request) + cc->iv_size);
 	if (!cc->req_pool) {
 		ti->error = "Cannot allocate crypt request mempool";
-		goto bad_req_pool;
+		goto bad;
 	}
 	cc->req = NULL;
 
 	cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
 	if (!cc->page_pool) {
 		ti->error = "Cannot allocate page mempool";
-		goto bad_page_pool;
+		goto bad;
 	}
 
 	cc->bs = bioset_create(MIN_IOS, 0);
 	if (!cc->bs) {
 		ti->error = "Cannot allocate crypt bioset";
-		goto bad_bs;
+		goto bad;
 	}
 
+	ret = -EINVAL;
 	if (sscanf(argv[2], "%llu", &tmpll) != 1) {
 		ti->error = "Invalid iv_offset sector";
-		goto bad_device;
+		goto bad;
 	}
 	cc->iv_offset = tmpll;
 
-	if (sscanf(argv[4], "%llu", &tmpll) != 1) {
-		ti->error = "Invalid device sector";
-		goto bad_device;
-	}
-	cc->start = tmpll;
-
 	if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) {
 		ti->error = "Device lookup failed";
-		goto bad_device;
+		goto bad;
 	}
 
-	if (ivmode && cc->iv_gen_ops) {
-		if (ivopts)
-			*(ivopts - 1) = ':';
-		cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL);
-		if (!cc->iv_mode) {
-			ti->error = "Error kmallocing iv_mode string";
-			goto bad_ivmode_string;
-		}
-		strcpy(cc->iv_mode, ivmode);
-	} else
-		cc->iv_mode = NULL;
+	if (sscanf(argv[4], "%llu", &tmpll) != 1) {
+		ti->error = "Invalid device sector";
+		goto bad;
+	}
+	cc->start = tmpll;
 
+	ret = -ENOMEM;
 	cc->io_queue = create_singlethread_workqueue("kcryptd_io");
 	if (!cc->io_queue) {
 		ti->error = "Couldn't create kcryptd io queue";
-		goto bad_io_queue;
+		goto bad;
 	}
 
 	cc->crypt_queue = create_singlethread_workqueue("kcryptd");
 	if (!cc->crypt_queue) {
 		ti->error = "Couldn't create kcryptd queue";
-		goto bad_crypt_queue;
+		goto bad;
 	}
 
 	ti->num_flush_requests = 1;
-	ti->private = cc;
 	return 0;
 
-bad_crypt_queue:
-	destroy_workqueue(cc->io_queue);
-bad_io_queue:
-	kfree(cc->iv_mode);
-bad_ivmode_string:
-	dm_put_device(ti, cc->dev);
-bad_device:
-	bioset_free(cc->bs);
-bad_bs:
-	mempool_destroy(cc->page_pool);
-bad_page_pool:
-	mempool_destroy(cc->req_pool);
-bad_req_pool:
-	mempool_destroy(cc->io_pool);
-bad_slab_pool:
-	if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
-		cc->iv_gen_ops->dtr(cc);
-bad_ivmode:
-	crypto_free_ablkcipher(tfm);
-bad_cipher:
-	/* Must zero key material before freeing */
-	kzfree(cc);
-	return -EINVAL;
-}
-
-static void crypt_dtr(struct dm_target *ti)
-{
-	struct crypt_config *cc = (struct crypt_config *) ti->private;
-
-	destroy_workqueue(cc->io_queue);
-	destroy_workqueue(cc->crypt_queue);
-
-	if (cc->req)
-		mempool_free(cc->req, cc->req_pool);
-
-	bioset_free(cc->bs);
-	mempool_destroy(cc->page_pool);
-	mempool_destroy(cc->req_pool);
-	mempool_destroy(cc->io_pool);
-
-	kfree(cc->iv_mode);
-	if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
-		cc->iv_gen_ops->dtr(cc);
-	crypto_free_ablkcipher(cc->tfm);
-	dm_put_device(ti, cc->dev);
-
-	/* Must zero key material before freeing */
-	kzfree(cc);
+bad:
+	crypt_dtr(ti);
+	return ret;
 }
 
 static int crypt_map(struct dm_target *ti, struct bio *bio,
@@ -1255,7 +1284,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
 		return DM_MAPIO_REMAPPED;
 	}
 
-	io = crypt_io_alloc(ti, bio, bio->bi_sector - ti->begin);
+	io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector));
 
 	if (bio_data_dir(io->base_bio) == READ)
 		kcryptd_queue_io(io);
@@ -1268,7 +1297,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
 static int crypt_status(struct dm_target *ti, status_type_t type,
 			char *result, unsigned int maxlen)
 {
-	struct crypt_config *cc = (struct crypt_config *) ti->private;
+	struct crypt_config *cc = ti->private;
 	unsigned int sz = 0;
 
 	switch (type) {
@@ -1277,11 +1306,10 @@ static int crypt_status(struct dm_target *ti, status_type_t type,
 		break;
 
 	case STATUSTYPE_TABLE:
-		if (cc->iv_mode)
-			DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode,
-			       cc->iv_mode);
+		if (cc->cipher_mode)
+			DMEMIT("%s-%s ", cc->cipher, cc->cipher_mode);
 		else
-			DMEMIT("%s-%s ", cc->cipher, cc->chainmode);
+			DMEMIT("%s ", cc->cipher);
 
 		if (cc->key_size > 0) {
 			if ((maxlen - sz) < ((cc->key_size << 1) + 1))
@@ -1378,7 +1406,7 @@ static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
 		return max_size;
 
 	bvm->bi_bdev = cc->dev->bdev;
-	bvm->bi_sector = cc->start + bvm->bi_sector - ti->begin;
+	bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector);
 
 	return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
 }
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 852052880d7..baa11912cc9 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -198,6 +198,7 @@ out:
 	atomic_set(&dc->may_delay, 1);
 
 	ti->num_flush_requests = 1;
+	ti->num_discard_requests = 1;
 	ti->private = dc;
 	return 0;
 
@@ -281,14 +282,13 @@ static int delay_map(struct dm_target *ti, struct bio *bio,
 		bio->bi_bdev = dc->dev_write->bdev;
 		if (bio_sectors(bio))
 			bio->bi_sector = dc->start_write +
-					 (bio->bi_sector - ti->begin);
+					 dm_target_offset(ti, bio->bi_sector);
 
 		return delay_bio(dc, dc->write_delay, bio);
 	}
 
 	bio->bi_bdev = dc->dev_read->bdev;
-	bio->bi_sector = dc->start_read +
-			 (bio->bi_sector - ti->begin);
+	bio->bi_sector = dc->start_read + dm_target_offset(ti, bio->bi_sector);
 
 	return delay_bio(dc, dc->read_delay, bio);
 }
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 2b7907b6dd0..0bdb201c2c2 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -173,7 +173,9 @@ int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
 
 	/* Validate the chunk size against the device block size */
 	if (chunk_size %
-	    (bdev_logical_block_size(dm_snap_cow(store->snap)->bdev) >> 9)) {
+	    (bdev_logical_block_size(dm_snap_cow(store->snap)->bdev) >> 9) ||
+	    chunk_size %
+	    (bdev_logical_block_size(dm_snap_origin(store->snap)->bdev) >> 9)) {
 		*error = "Chunk size is not a multiple of device blocksize";
 		return -EINVAL;
 	}
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index e8dfa06af3b..0b2536247cf 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -126,8 +126,9 @@ struct dm_exception_store {
 };
 
 /*
- * Obtain the cow device used by a given snapshot.
+ * Obtain the origin or cow device used by a given snapshot.
  */
+struct dm_dev *dm_snap_origin(struct dm_snapshot *snap);
 struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);
 
 /*
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index d7500e1c26f..3e39193e503 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -249,55 +249,66 @@ static void __hash_remove(struct hash_cell *hc)
 
 static void dm_hash_remove_all(int keep_open_devices)
 {
-	int i, dev_skipped, dev_removed;
+	int i, dev_skipped;
 	struct hash_cell *hc;
-	struct list_head *tmp, *n;
+	struct mapped_device *md;
+
+retry:
+	dev_skipped = 0;
 
 	down_write(&_hash_lock);
 
-retry:
-	dev_skipped = dev_removed = 0;
 	for (i = 0; i < NUM_BUCKETS; i++) {
-		list_for_each_safe (tmp, n, _name_buckets + i) {
-			hc = list_entry(tmp, struct hash_cell, name_list);
+		list_for_each_entry(hc, _name_buckets + i, name_list) {
+			md = hc->md;
+			dm_get(md);
 
-			if (keep_open_devices &&
-			    dm_lock_for_deletion(hc->md)) {
+			if (keep_open_devices && dm_lock_for_deletion(md)) {
+				dm_put(md);
 				dev_skipped++;
 				continue;
 			}
+
 			__hash_remove(hc);
-			dev_removed = 1;
-		}
-	}
 
-	/*
-	 * Some mapped devices may be using other mapped devices, so if any
-	 * still exist, repeat until we make no further progress.
-	 */
-	if (dev_skipped) {
-		if (dev_removed)
-			goto retry;
+			up_write(&_hash_lock);
 
-		DMWARN("remove_all left %d open device(s)", dev_skipped);
+			dm_put(md);
+			if (likely(keep_open_devices))
+				dm_destroy(md);
+			else
+				dm_destroy_immediate(md);
+
+			/*
+			 * Some mapped devices may be using other mapped
+			 * devices, so repeat until we make no further
+			 * progress.  If a new mapped device is created
+			 * here it will also get removed.
+			 */
+			goto retry;
+		}
 	}
 
 	up_write(&_hash_lock);
+
+	if (dev_skipped)
+		DMWARN("remove_all left %d open device(s)", dev_skipped);
 }
 
-static int dm_hash_rename(uint32_t cookie, uint32_t *flags, const char *old,
-			  const char *new)
+static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
+					    const char *new)
 {
 	char *new_name, *old_name;
 	struct hash_cell *hc;
 	struct dm_table *table;
+	struct mapped_device *md;
 
 	/*
 	 * duplicate new.
 	 */
 	new_name = kstrdup(new, GFP_KERNEL);
 	if (!new_name)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	down_write(&_hash_lock);
 
@@ -306,24 +317,24 @@ static int dm_hash_rename(uint32_t cookie, uint32_t *flags, const char *old,
 	 */
 	hc = __get_name_cell(new);
 	if (hc) {
-		DMWARN("asked to rename to an already existing name %s -> %s",
-		       old, new);
+		DMWARN("asked to rename to an already-existing name %s -> %s",
+		       param->name, new);
 		dm_put(hc->md);
 		up_write(&_hash_lock);
 		kfree(new_name);
-		return -EBUSY;
+		return ERR_PTR(-EBUSY);
 	}
 
 	/*
 	 * Is there such a device as 'old' ?
 	 */
-	hc = __get_name_cell(old);
+	hc = __get_name_cell(param->name);
 	if (!hc) {
-		DMWARN("asked to rename a non existent device %s -> %s",
-		       old, new);
+		DMWARN("asked to rename a non-existent device %s -> %s",
+		       param->name, new);
 		up_write(&_hash_lock);
 		kfree(new_name);
-		return -ENXIO;
+		return ERR_PTR(-ENXIO);
 	}
 
 	/*
@@ -345,13 +356,14 @@ static int dm_hash_rename(uint32_t cookie, uint32_t *flags, const char *old,
 		dm_table_put(table);
 	}
 
-	if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie))
-		*flags |= DM_UEVENT_GENERATED_FLAG;
+	if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr))
+		param->flags |= DM_UEVENT_GENERATED_FLAG;
 
-	dm_put(hc->md);
+	md = hc->md;
 	up_write(&_hash_lock);
 	kfree(old_name);
-	return 0;
+
+	return md;
 }
 
 /*-----------------------------------------------------------------
@@ -573,7 +585,7 @@ static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md,
  * Fills in a dm_ioctl structure, ready for sending back to
  * userland.
  */
-static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
+static void __dev_status(struct mapped_device *md, struct dm_ioctl *param)
 {
 	struct gendisk *disk = dm_disk(md);
 	struct dm_table *table;
@@ -617,8 +629,6 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
 			dm_table_put(table);
 		}
 	}
-
-	return 0;
 }
 
 static int dev_create(struct dm_ioctl *param, size_t param_size)
@@ -640,15 +650,17 @@ static int dev_create(struct dm_ioctl *param, size_t param_size)
 	r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md);
 	if (r) {
 		dm_put(md);
+		dm_destroy(md);
 		return r;
 	}
 
 	param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
 
-	r = __dev_status(md, param);
+	__dev_status(md, param);
+
 	dm_put(md);
 
-	return r;
+	return 0;
 }
 
 /*
@@ -742,6 +754,7 @@ static int dev_remove(struct dm_ioctl *param, size_t param_size)
 		param->flags |= DM_UEVENT_GENERATED_FLAG;
 
 	dm_put(md);
+	dm_destroy(md);
 	return 0;
 }
 
@@ -762,6 +775,7 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
 {
 	int r;
 	char *new_name = (char *) param + param->data_start;
+	struct mapped_device *md;
 
 	if (new_name < param->data ||
 	    invalid_str(new_name, (void *) param + param_size) ||
@@ -774,10 +788,14 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
 	if (r)
 		return r;
 
-	param->data_size = 0;
+	md = dm_hash_rename(param, new_name);
+	if (IS_ERR(md))
+		return PTR_ERR(md);
+
+	__dev_status(md, param);
+	dm_put(md);
 
-	return dm_hash_rename(param->event_nr, &param->flags, param->name,
-			      new_name);
+	return 0;
 }
 
 static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
@@ -818,8 +836,6 @@ static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
 	geometry.start = indata[3];
 
 	r = dm_set_geometry(md, &geometry);
-	if (!r)
-		r = __dev_status(md, param);
 
 	param->data_size = 0;
 
@@ -843,13 +859,17 @@ static int do_suspend(struct dm_ioctl *param)
 	if (param->flags & DM_NOFLUSH_FLAG)
 		suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG;
 
-	if (!dm_suspended_md(md))
+	if (!dm_suspended_md(md)) {
 		r = dm_suspend(md, suspend_flags);
+		if (r)
+			goto out;
+	}
 
-	if (!r)
-		r = __dev_status(md, param);
+	__dev_status(md, param);
 
+out:
 	dm_put(md);
+
 	return r;
 }
 
@@ -911,7 +931,7 @@ static int do_resume(struct dm_ioctl *param)
 		dm_table_destroy(old_map);
 
 	if (!r)
-		r = __dev_status(md, param);
+		__dev_status(md, param);
 
 	dm_put(md);
 	return r;
@@ -935,16 +955,16 @@ static int dev_suspend(struct dm_ioctl *param, size_t param_size)
  */
 static int dev_status(struct dm_ioctl *param, size_t param_size)
 {
-	int r;
 	struct mapped_device *md;
 
 	md = find_device(param);
 	if (!md)
 		return -ENXIO;
 
-	r = __dev_status(md, param);
+	__dev_status(md, param);
 	dm_put(md);
-	return r;
+
+	return 0;
 }
 
 /*
@@ -1019,7 +1039,7 @@ static void retrieve_status(struct dm_table *table,
  */
 static int dev_wait(struct dm_ioctl *param, size_t param_size)
 {
-	int r;
+	int r = 0;
 	struct mapped_device *md;
 	struct dm_table *table;
 
@@ -1040,9 +1060,7 @@ static int dev_wait(struct dm_ioctl *param, size_t param_size)
 	 * changed to trigger the event, so we may as well tell
 	 * him and save an ioctl.
 	 */
-	r = __dev_status(md, param);
-	if (r)
-		goto out;
+	__dev_status(md, param);
 
 	table = dm_get_live_or_inactive_table(md, param);
 	if (table) {
@@ -1050,8 +1068,9 @@ static int dev_wait(struct dm_ioctl *param, size_t param_size)
 		dm_table_put(table);
 	}
 
- out:
+out:
 	dm_put(md);
+
 	return r;
 }
 
@@ -1112,28 +1131,9 @@ static int populate_table(struct dm_table *table,
 		next = spec->next;
 	}
 
-	r = dm_table_set_type(table);
-	if (r) {
-		DMWARN("unable to set table type");
-		return r;
-	}
-
 	return dm_table_complete(table);
 }
 
-static int table_prealloc_integrity(struct dm_table *t,
-				    struct mapped_device *md)
-{
-	struct list_head *devices = dm_table_get_devices(t);
-	struct dm_dev_internal *dd;
-
-	list_for_each_entry(dd, devices, list)
-		if (bdev_get_integrity(dd->dm_dev.bdev))
-			return blk_integrity_register(dm_disk(md), NULL);
-
-	return 0;
-}
-
 static int table_load(struct dm_ioctl *param, size_t param_size)
 {
 	int r;
@@ -1155,21 +1155,30 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
 		goto out;
 	}
 
-	r = table_prealloc_integrity(t, md);
-	if (r) {
-		DMERR("%s: could not register integrity profile.",
-		      dm_device_name(md));
+	/* Protect md->type and md->queue against concurrent table loads. */
+	dm_lock_md_type(md);
+	if (dm_get_md_type(md) == DM_TYPE_NONE)
+		/* Initial table load: acquire type of table. */
+		dm_set_md_type(md, dm_table_get_type(t));
+	else if (dm_get_md_type(md) != dm_table_get_type(t)) {
+		DMWARN("can't change device type after initial table load.");
 		dm_table_destroy(t);
+		dm_unlock_md_type(md);
+		r = -EINVAL;
 		goto out;
 	}
 
-	r = dm_table_alloc_md_mempools(t);
+	/* setup md->queue to reflect md's type (may block) */
+	r = dm_setup_md_queue(md);
 	if (r) {
-		DMWARN("unable to allocate mempools for this table");
+		DMWARN("unable to set up device queue for new table.");
 		dm_table_destroy(t);
+		dm_unlock_md_type(md);
 		goto out;
 	}
+	dm_unlock_md_type(md);
 
+	/* stage inactive table */
 	down_write(&_hash_lock);
 	hc = dm_get_mdptr(md);
 	if (!hc || hc->md != md) {
@@ -1186,7 +1195,7 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
 	up_write(&_hash_lock);
 
 	param->flags |= DM_INACTIVE_PRESENT_FLAG;
-	r = __dev_status(md, param);
+	__dev_status(md, param);
 
 out:
 	dm_put(md);
@@ -1196,7 +1205,6 @@ out:
 
 static int table_clear(struct dm_ioctl *param, size_t param_size)
 {
-	int r;
 	struct hash_cell *hc;
 	struct mapped_device *md;
 
@@ -1216,11 +1224,12 @@ static int table_clear(struct dm_ioctl *param, size_t param_size)
 
 	param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
 
-	r = __dev_status(hc->md, param);
+	__dev_status(hc->md, param);
 	md = hc->md;
 	up_write(&_hash_lock);
 	dm_put(md);
-	return r;
+
+	return 0;
 }
 
 /*
@@ -1265,7 +1274,6 @@ static void retrieve_deps(struct dm_table *table,
 
 static int table_deps(struct dm_ioctl *param, size_t param_size)
 {
-	int r = 0;
 	struct mapped_device *md;
 	struct dm_table *table;
 
@@ -1273,9 +1281,7 @@ static int table_deps(struct dm_ioctl *param, size_t param_size)
 	if (!md)
 		return -ENXIO;
 
-	r = __dev_status(md, param);
-	if (r)
-		goto out;
+	__dev_status(md, param);
 
 	table = dm_get_live_or_inactive_table(md, param);
 	if (table) {
@@ -1283,9 +1289,9 @@ static int table_deps(struct dm_ioctl *param, size_t param_size)
 		dm_table_put(table);
 	}
 
- out:
 	dm_put(md);
-	return r;
+
+	return 0;
 }
 
 /*
@@ -1294,7 +1300,6 @@ static int table_deps(struct dm_ioctl *param, size_t param_size)
  */
 static int table_status(struct dm_ioctl *param, size_t param_size)
 {
-	int r;
 	struct mapped_device *md;
 	struct dm_table *table;
 
@@ -1302,9 +1307,7 @@ static int table_status(struct dm_ioctl *param, size_t param_size)
 	if (!md)
 		return -ENXIO;
 
-	r = __dev_status(md, param);
-	if (r)
-		goto out;
+	__dev_status(md, param);
 
 	table = dm_get_live_or_inactive_table(md, param);
 	if (table) {
@@ -1312,9 +1315,9 @@ static int table_status(struct dm_ioctl *param, size_t param_size)
 		dm_table_put(table);
 	}
 
-out:
 	dm_put(md);
-	return r;
+
+	return 0;
 }
 
 /*
@@ -1333,10 +1336,6 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
 	if (!md)
 		return -ENXIO;
 
-	r = __dev_status(md, param);
-	if (r)
-		goto out;
-
 	if (tmsg < (struct dm_target_msg *) param->data ||
 	    invalid_str(tmsg->message, (void *) param + param_size)) {
 		DMWARN("Invalid target message parameters.");
@@ -1593,18 +1592,22 @@ static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u)
 #endif
 
 static const struct file_operations _ctl_fops = {
+	.open = nonseekable_open,
 	.unlocked_ioctl	 = dm_ctl_ioctl,
 	.compat_ioctl = dm_compat_ctl_ioctl,
 	.owner	 = THIS_MODULE,
 };
 
 static struct miscdevice _dm_misc = {
-	.minor 		= MISC_DYNAMIC_MINOR,
+	.minor		= MAPPER_CTRL_MINOR,
 	.name  		= DM_NAME,
-	.nodename	= "mapper/control",
+	.nodename	= DM_DIR "/" DM_CONTROL_NODE,
 	.fops  		= &_ctl_fops