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: (44 commits)
  dm raid1: report fault status
  dm raid1: handle read failures
  dm raid1: fix EIO after log failure
  dm raid1: handle recovery failures
  dm raid1: handle write failures
  dm snapshot: combine consecutive exceptions in memory
  dm: stripe enhanced status return
  dm: stripe trigger event on failure
  dm log: auto load modules
  dm: move deferred bio flushing to workqueue
  dm crypt: use async crypto
  dm crypt: prepare async callback fn
  dm crypt: add completion for async
  dm crypt: add async request mempool
  dm crypt: extract scatterlist processing
  dm crypt: tidy io ref counting
  dm crypt: introduce crypt_write_io_loop
  dm crypt: abstract crypt_write_done
  dm crypt: store sector mapping in dm_crypt_io
  dm crypt: move queue functions
  ...

12 files changed, 1361 insertions, 408 deletions

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 3fa7c77d9bd..610af916891 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -204,7 +204,7 @@ config BLK_DEV_DM
 
 config DM_DEBUG
 	boolean "Device mapper debugging support"
-	depends on BLK_DEV_DM && EXPERIMENTAL
+	depends on BLK_DEV_DM
 	---help---
 	  Enable this for messages that may help debug device-mapper problems.
 
@@ -212,7 +212,7 @@ config DM_DEBUG
 
 config DM_CRYPT
 	tristate "Crypt target support"
-	depends on BLK_DEV_DM && EXPERIMENTAL
+	depends on BLK_DEV_DM
 	select CRYPTO
 	select CRYPTO_CBC
 	---help---
@@ -230,34 +230,34 @@ config DM_CRYPT
 	  If unsure, say N.
 
 config DM_SNAPSHOT
-       tristate "Snapshot target (EXPERIMENTAL)"
-       depends on BLK_DEV_DM && EXPERIMENTAL
+       tristate "Snapshot target"
+       depends on BLK_DEV_DM
        ---help---
          Allow volume managers to take writable snapshots of a device.
 
 config DM_MIRROR
-       tristate "Mirror target (EXPERIMENTAL)"
-       depends on BLK_DEV_DM && EXPERIMENTAL
+       tristate "Mirror target"
+       depends on BLK_DEV_DM
        ---help---
          Allow volume managers to mirror logical volumes, also
          needed for live data migration tools such as 'pvmove'.
 
 config DM_ZERO
-	tristate "Zero target (EXPERIMENTAL)"
-	depends on BLK_DEV_DM && EXPERIMENTAL
+	tristate "Zero target"
+	depends on BLK_DEV_DM
 	---help---
 	  A target that discards writes, and returns all zeroes for
 	  reads.  Useful in some recovery situations.
 
 config DM_MULTIPATH
-	tristate "Multipath target (EXPERIMENTAL)"
-	depends on BLK_DEV_DM && EXPERIMENTAL
+	tristate "Multipath target"
+	depends on BLK_DEV_DM
 	---help---
 	  Allow volume managers to support multipath hardware.
 
 config DM_MULTIPATH_EMC
-	tristate "EMC CX/AX multipath support (EXPERIMENTAL)"
-	depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL
+	tristate "EMC CX/AX multipath support"
+	depends on DM_MULTIPATH && BLK_DEV_DM
 	---help---
 	  Multipath support for EMC CX/AX series hardware.
 
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 6b66ee46b87..b04f98df94e 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1,11 +1,12 @@
 /*
  * Copyright (C) 2003 Christophe Saout <christophe@saout.de>
  * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
  *
  * This file is released under the GPL.
  */
 
+#include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -28,20 +29,10 @@
 #define MESG_STR(x) x, sizeof(x)
 
 /*
- * per bio private data
- */
-struct dm_crypt_io {
-	struct dm_target *target;
-	struct bio *base_bio;
-	struct work_struct work;
-	atomic_t pending;
-	int error;
-};
-
-/*
  * context holding the current state of a multi-part conversion
  */
 struct convert_context {
+	struct completion restart;
 	struct bio *bio_in;
 	struct bio *bio_out;
 	unsigned int offset_in;
@@ -49,7 +40,27 @@ struct convert_context {
 	unsigned int idx_in;
 	unsigned int idx_out;
 	sector_t sector;
-	int write;
+	atomic_t pending;
+};
+
+/*
+ * per bio private data
+ */
+struct dm_crypt_io {
+	struct dm_target *target;
+	struct bio *base_bio;
+	struct work_struct work;
+
+	struct convert_context ctx;
+
+	atomic_t pending;
+	int error;
+	sector_t sector;
+};
+
+struct dm_crypt_request {
+	struct scatterlist sg_in;
+	struct scatterlist sg_out;
 };
 
 struct crypt_config;
@@ -72,10 +83,11 @@ struct crypt_config {
 	sector_t start;
 
 	/*
-	 * pool for per bio private data and
-	 * for encryption buffer pages
+	 * pool for per bio private data, crypto requests and
+	 * encryption requeusts/buffer pages
 	 */
 	mempool_t *io_pool;
+	mempool_t *req_pool;
 	mempool_t *page_pool;
 	struct bio_set *bs;
 
@@ -93,9 +105,25 @@ struct crypt_config {
 	sector_t iv_offset;
 	unsigned int iv_size;
 
+	/*
+	 * Layout of each crypto request:
+	 *
+	 *   struct ablkcipher_request
+	 *      context
+	 *      padding
+	 *   struct dm_crypt_request
+	 *      padding
+	 *   IV
+	 *
+	 * The padding is added so that dm_crypt_request and the IV are
+	 * correctly aligned.
+	 */
+	unsigned int dmreq_start;
+	struct ablkcipher_request *req;
+
 	char cipher[CRYPTO_MAX_ALG_NAME];
 	char chainmode[CRYPTO_MAX_ALG_NAME];
-	struct crypto_blkcipher *tfm;
+	struct crypto_ablkcipher *tfm;
 	unsigned long flags;
 	unsigned int key_size;
 	u8 key[0];
@@ -108,6 +136,7 @@ struct crypt_config {
 static struct kmem_cache *_crypt_io_pool;
 
 static void clone_init(struct dm_crypt_io *, struct bio *);
+static void kcryptd_queue_crypt(struct dm_crypt_io *io);
 
 /*
  * Different IV generation algorithms:
@@ -188,7 +217,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
 		return PTR_ERR(essiv_tfm);
 	}
 	if (crypto_cipher_blocksize(essiv_tfm) !=
-	    crypto_blkcipher_ivsize(cc->tfm)) {
+	    crypto_ablkcipher_ivsize(cc->tfm)) {
 		ti->error = "Block size of ESSIV cipher does "
 			    "not match IV size of block cipher";
 		crypto_free_cipher(essiv_tfm);
@@ -225,7 +254,7 @@ static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
 static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
 			      const char *opts)
 {
-	unsigned int bs = crypto_blkcipher_blocksize(cc->tfm);
+	unsigned bs = crypto_ablkcipher_blocksize(cc->tfm);
 	int log = ilog2(bs);
 
 	/* we need to calculate how far we must shift the sector count
@@ -289,42 +318,10 @@ static struct crypt_iv_operations crypt_iv_null_ops = {
 	.generator = crypt_iv_null_gen
 };
 
-static int
-crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
-                          struct scatterlist *in, unsigned int length,
-                          int write, sector_t sector)
-{
-	u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64))));
-	struct blkcipher_desc desc = {
-		.tfm = cc->tfm,
-		.info = iv,
-		.flags = CRYPTO_TFM_REQ_MAY_SLEEP,
-	};
-	int r;
-
-	if (cc->iv_gen_ops) {
-		r = cc->iv_gen_ops->generator(cc, iv, sector);
-		if (r < 0)
-			return r;
-
-		if (write)
-			r = crypto_blkcipher_encrypt_iv(&desc, out, in, length);
-		else
-			r = crypto_blkcipher_decrypt_iv(&desc, out, in, length);
-	} else {
-		if (write)
-			r = crypto_blkcipher_encrypt(&desc, out, in, length);
-		else
-			r = crypto_blkcipher_decrypt(&desc, out, in, length);
-	}
-
-	return r;
-}
-
 static void crypt_convert_init(struct crypt_config *cc,
 			       struct convert_context *ctx,
 			       struct bio *bio_out, struct bio *bio_in,
-			       sector_t sector, int write)
+			       sector_t sector)
 {
 	ctx->bio_in = bio_in;
 	ctx->bio_out = bio_out;
@@ -333,7 +330,79 @@ static void crypt_convert_init(struct crypt_config *cc,
 	ctx->idx_in = bio_in ? bio_in->bi_idx : 0;
 	ctx->idx_out = bio_out ? bio_out->bi_idx : 0;
 	ctx->sector = sector + cc->iv_offset;
-	ctx->write = write;
+	init_completion(&ctx->restart);
+	/*
+	 * Crypto operation can be asynchronous,
+	 * ctx->pending is increased after request submission.
+	 * We need to ensure that we don't call the crypt finish
+	 * operation before pending got incremented
+	 * (dependent on crypt submission return code).
+	 */
+	atomic_set(&ctx->pending, 2);
+}
+
+static int crypt_convert_block(struct crypt_config *cc,
+			       struct convert_context *ctx,
+			       struct ablkcipher_request *req)
+{
+	struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
+	struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
+	struct dm_crypt_request *dmreq;
+	u8 *iv;
+	int r = 0;
+
+	dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+	iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
+			 crypto_ablkcipher_alignmask(cc->tfm) + 1);
+
+	sg_init_table(&dmreq->sg_in, 1);
+	sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
+		    bv_in->bv_offset + ctx->offset_in);
+
+	sg_init_table(&dmreq->sg_out, 1);
+	sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
+		    bv_out->bv_offset + ctx->offset_out);
+
+	ctx->offset_in += 1 << SECTOR_SHIFT;
+	if (ctx->offset_in >= bv_in->bv_len) {
+		ctx->offset_in = 0;
+		ctx->idx_in++;
+	}
+
+	ctx->offset_out += 1 << SECTOR_SHIFT;
+	if (ctx->offset_out >= bv_out->bv_len) {
+		ctx->offset_out = 0;
+		ctx->idx_out++;
+	}
+
+	if (cc->iv_gen_ops) {
+		r = cc->iv_gen_ops->generator(cc, iv, ctx->sector);
+		if (r < 0)
+			return r;
+	}
+
+	ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
+				     1 << SECTOR_SHIFT, iv);
+
+	if (bio_data_dir(ctx->bio_in) == WRITE)
+		r = crypto_ablkcipher_encrypt(req);
+	else
+		r = crypto_ablkcipher_decrypt(req);
+
+	return r;
+}
+
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+			       int error);
+static void crypt_alloc_req(struct crypt_config *cc,
+			    struct convert_context *ctx)
+{
+	if (!cc->req)
+		cc->req = mempool_alloc(cc->req_pool, GFP_NOIO);
+	ablkcipher_request_set_tfm(cc->req, cc->tfm);
+	ablkcipher_request_set_callback(cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+					     CRYPTO_TFM_REQ_MAY_SLEEP,
+					     kcryptd_async_done, ctx);
 }
 
 /*
@@ -346,36 +415,38 @@ static int crypt_convert(struct crypt_config *cc,
 
 	while(ctx->idx_in < ctx->bio_in->bi_vcnt &&
 	      ctx->idx_out < ctx->bio_out->bi_vcnt) {
-		struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
-		struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
-		struct scatterlist sg_in, sg_out;
-
-		sg_init_table(&sg_in, 1);
-		sg_set_page(&sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, bv_in->bv_offset + ctx->offset_in);
-
-		sg_init_table(&sg_out, 1);
-		sg_set_page(&sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, bv_out->bv_offset + ctx->offset_out);
 
-		ctx->offset_in += sg_in.length;
-		if (ctx->offset_in >= bv_in->bv_len) {
-			ctx->offset_in = 0;
-			ctx->idx_in++;
+		crypt_alloc_req(cc, ctx);
+
+		r = crypt_convert_block(cc, ctx, cc->req);
+
+		switch (r) {
+		case -EBUSY:
+			wait_for_completion(&ctx->restart);
+			INIT_COMPLETION(ctx->restart);
+			/* fall through*/
+		case -EINPROGRESS:
+			atomic_inc(&ctx->pending);
+			cc->req = NULL;
+			r = 0;
+			/* fall through*/
+		case 0:
+			ctx->sector++;
+			continue;
 		}
 
-		ctx->offset_out += sg_out.length;
-		if (ctx->offset_out >= bv_out->bv_len) {
-			ctx->offset_out = 0;
-			ctx->idx_out++;
-		}
-
-		r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
-					      ctx->write, ctx->sector);
-		if (r < 0)
-			break;
-
-		ctx->sector++;
+		break;
 	}
 
+	/*
+	 * If there are pending crypto operation run async
+	 * code. Otherwise process return code synchronously.
+	 * The step of 2 ensures that async finish doesn't
+	 * call crypto finish too early.
+	 */
+	if (atomic_sub_return(2, &ctx->pending))
+		return -EINPROGRESS;
+
 	return r;
 }
 
@@ -455,18 +526,14 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
  * One of the bios was finished. Check for completion of
  * the whole request and correctly clean up the buffer.
  */
-static void crypt_dec_pending(struct dm_crypt_io *io, int error)
+static void crypt_dec_pending(struct dm_crypt_io *io)
 {
-	struct crypt_config *cc = (struct crypt_config *) io->target->private;
-
-	if (error < 0)
-		io->error = error;
+	struct crypt_config *cc = io->target->private;
 
 	if (!atomic_dec_and_test(&io->pending))
 		return;
 
 	bio_endio(io->base_bio, io->error);
-
 	mempool_free(io, cc->io_pool);
 }
 
@@ -484,30 +551,11 @@ static void crypt_dec_pending(struct dm_crypt_io *io, int error)
  * starved by new requests which can block in the first stages due
  * to memory allocation.
  */
-static void kcryptd_do_work(struct work_struct *work);
-static void kcryptd_do_crypt(struct work_struct *work);
-
-static void kcryptd_queue_io(struct dm_crypt_io *io)
-{
-	struct crypt_config *cc = io->target->private;
-
-	INIT_WORK(&io->work, kcryptd_do_work);
-	queue_work(cc->io_queue, &io->work);
-}
-
-static void kcryptd_queue_crypt(struct dm_crypt_io *io)
-{
-	struct crypt_config *cc = io->target->private;
-
-	INIT_WORK(&io->work, kcryptd_do_crypt);
-	queue_work(cc->crypt_queue, &io->work);
-}
-
 static void crypt_endio(struct bio *clone, int error)
 {
 	struct dm_crypt_io *io = clone->bi_private;
 	struct crypt_config *cc = io->target->private;
-	unsigned read_io = bio_data_dir(clone) == READ;
+	unsigned rw = bio_data_dir(clone);
 
 	if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error))
 		error = -EIO;
@@ -515,21 +563,20 @@ static void crypt_endio(struct bio *clone, int error)
 	/*
 	 * free the processed pages
 	 */
-	if (!read_io) {
+	if (rw == WRITE)
 		crypt_free_buffer_pages(cc, clone);
-		goto out;
+
+	bio_put(clone);
+
+	if (rw == READ && !error) {
+		kcryptd_queue_crypt(io);
+		return;
 	}
 
 	if (unlikely(error))
-		goto out;
-
-	bio_put(clone);
-	kcryptd_queue_crypt(io);
-	return;
+		io->error = error;
 
-out:
-	bio_put(clone);
-	crypt_dec_pending(io, error);
+	crypt_dec_pending(io);
 }
 
 static void clone_init(struct dm_crypt_io *io, struct bio *clone)
@@ -543,12 +590,11 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
 	clone->bi_destructor = dm_crypt_bio_destructor;
 }
 
-static void process_read(struct dm_crypt_io *io)
+static void kcryptd_io_read(struct dm_crypt_io *io)
 {
 	struct crypt_config *cc = io->target->private;
 	struct bio *base_bio = io->base_bio;
 	struct bio *clone;
-	sector_t sector = base_bio->bi_sector - io->target->begin;
 
 	atomic_inc(&io->pending);
 
@@ -559,7 +605,8 @@ static void process_read(struct dm_crypt_io *io)
 	 */
 	clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs);
 	if (unlikely(!clone)) {
-		crypt_dec_pending(io, -ENOMEM);
+		io->error = -ENOMEM;
+		crypt_dec_pending(io);
 		return;
 	}
 
@@ -567,25 +614,71 @@ static void process_read(struct dm_crypt_io *io)
 	clone->bi_idx = 0;
 	clone->bi_vcnt = bio_segments(base_bio);
 	clone->bi_size = base_bio->bi_size;
-	clone->bi_sector = cc->start + sector;
+	clone->bi_sector = cc->start + io->sector;
 	memcpy(clone->bi_io_vec, bio_iovec(base_bio),
 	       sizeof(struct bio_vec) * clone->bi_vcnt);
 
 	generic_make_request(clone);
 }
 
-static void process_write(struct dm_crypt_io *io)
+static void kcryptd_io_write(struct dm_crypt_io *io)
+{
+	struct bio *clone = io->ctx.bio_out;
+
+	generic_make_request(clone);
+}
+
+static void kcryptd_io(struct work_struct *work)
+{
+	struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
+
+	if (bio_data_dir(io->base_bio) == READ)
+		kcryptd_io_read(io);
+	else
+		kcryptd_io_write(io);
+}
+
+static void kcryptd_queue_io(struct dm_crypt_io *io)
 {
 	struct crypt_config *cc = io->target->private;
-	struct bio *base_bio = io->base_bio;
-	struct bio *clone;
-	struct convert_context ctx;
-	unsigned remaining = base_bio->bi_size;
-	sector_t sector = base_bio->bi_sector - io->target->begin;
 
-	atomic_inc(&io->pending);
+	INIT_WORK(&io->work, kcryptd_io);
+	queue_work(cc->io_queue, &io->work);
+}
 
-	crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1);
+static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io,
+					  int error, int async)
+{
+	struct bio *clone = io->ctx.bio_out;
+	struct crypt_config *cc = io->target->private;
+
+	if (unlikely(error < 0)) {
+		crypt_free_buffer_pages(cc, clone);
+		bio_put(clone);
+		io->error = -EIO;
+		return;
+	}
+
+	/* crypt_convert should have filled the clone bio */
+	BUG_ON(io->ctx.idx_out < clone->bi_vcnt);
+
+	clone->bi_sector = cc->start + io->sector;
+	io->sector += bio_sectors(clone);
+
+	if (async)
+		kcryptd_queue_io(io);
+	else {
+		atomic_inc(&io->pending);
+		generic_make_request(clone);
+	}
+}
+
+static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io)
+{
+	struct crypt_config *cc = io->target->private;
+	struct bio *clone;
+	unsigned remaining = io->base_bio->bi_size;
+	int r;
 
 	/*
 	 * The allocated buffers can be smaller than the whole bio,
@@ -594,70 +687,110 @@ static void process_write(struct dm_crypt_io *io)
 	while (remaining) {
 		clone = crypt_alloc_buffer(io, remaining);
 		if (unlikely(!clone)) {
-			crypt_dec_pending(io, -ENOMEM);
+			io->error = -ENOMEM;
 			return;
 		}
 
-		ctx.bio_out = clone;
-		ctx.idx_out = 0;
+		io->ctx.bio_out = clone;
+		io->ctx.idx_out = 0;
 
-		if (unlikely(crypt_convert(cc, &ctx) < 0)) {
-			crypt_free_buffer_pages(cc, clone);
-			bio_put(clone);
-			crypt_dec_pending(io, -EIO);
-			return;
-		}
-
-		/* crypt_convert should have filled the clone bio */
-		BUG_ON(ctx.idx_out < clone->bi_vcnt);
-
-		clone->bi_sector = cc->start + sector;
 		remaining -= clone->bi_size;
-		sector += bio_sectors(clone);
 
-		/* Grab another reference to the io struct
-		 * before we kick off the request */
-		if (remaining)
-			atomic_inc(&io->pending);
+		r = crypt_convert(cc, &io->ctx);
 
-		generic_make_request(clone);
-
-		/* Do not reference clone after this - it
-		 * may be gone already. */
+		if (r != -EINPROGRESS) {
+			kcryptd_crypt_write_io_submit(io, r, 0);
+			if (unlikely(r < 0))
+				return;
+		} else
+			atomic_inc(&io->pending);
 
 		/* out of memory -> run queues */
-		if (remaining)
+		if (unlikely(remaining))
 			congestion_wait(WRITE, HZ/100);
 	}
 }
 
-static void process_read_endio(struct dm_crypt_io *io)
+static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
 {
 	struct crypt_config *cc = io->target->private;
-	struct convert_context ctx;
 
-	crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio,
-			   io->base_bio->bi_sector - io->target->begin, 0);
+	/*
+	 * Prevent io from disappearing until this function completes.
+	 */
+	atomic_inc(&io->pending);
+
+	crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, io->sector);
+	kcryptd_crypt_write_convert_loop(io);
 
-	crypt_dec_pending(io, crypt_convert(cc, &ctx));
+	crypt_dec_pending(io);
 }
 
-static void kcryptd_do_work(struct work_struct *work)
+static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error)
 {
-	struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
+	if (unlikely(error < 0))
+		io->error = -EIO;
+
+	crypt_dec_pending(io);
+}
+
+static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
+{
+	struct crypt_config *cc = io->target->private;
+	int r = 0;
+
+	atomic_inc(&io->pending);
+
+	crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
+			   io->sector);
+
+	r = crypt_convert(cc, &io->ctx);
+
+	if (r != -EINPROGRESS)
+		kcryptd_crypt_read_done(io, r);
+
+	crypt_dec_pending(io);
+}
+
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+			       int error)
+{
+	struct convert_context *ctx = async_req->data;
+	struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
+	struct crypt_config *cc = io->target->private;
+
+	if (error == -EINPROGRESS) {
+		complete(&ctx->restart);
+		return;
+	}
+
+	mempool_free(ablkcipher_request_cast(async_req), cc->req_pool);
+
+	if (!atomic_dec_and_test(&ctx->pending))
+		return;
 
 	if (bio_data_dir(io->base_bio) == READ)
-		process_read(io);
+		kcryptd_crypt_read_done(io, error);
+	else
+		kcryptd_crypt_write_io_submit(io, error, 1);
 }
 
-static void kcryptd_do_crypt(struct work_struct *work)
+static void kcryptd_crypt(struct work_struct *work)
 {
 	struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
 
 	if (bio_data_dir(io->base_bio) == READ)
-		process_read_endio(io);
+		kcryptd_crypt_read_convert(io);
 	else
-		process_write(io);
+		kcryptd_crypt_write_convert(io);
+}
+
+static void kcryptd_queue_crypt(struct dm_crypt_io *io)
+{
+	struct crypt_config *cc = io->target->private;
+
+	INIT_WORK(&io->work, kcryptd_crypt);
+	queue_work(cc->crypt_queue, &io->work);
 }
 
 /*
@@ -733,7 +866,7 @@ static int crypt_wipe_key(struct crypt_config *cc)
 static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 {
 	struct crypt_config *cc;
-	struct crypto_blkcipher *tfm;
+	struct crypto_ablkcipher *tfm;
 	char *tmp;
 	char *cipher;
 	char *chainmode;
@@ -787,7 +920,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		goto bad_cipher;
 	}
 
-	tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
+	tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0);
 	if (IS_ERR(tfm)) {
 		ti->error = "Error allocating crypto tfm";
 		goto bad_cipher;
@@ -821,7 +954,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	    cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
 		goto bad_ivmode;
 
-	cc->iv_size = crypto_blkcipher_ivsize(tfm);
+	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,
@@ -841,6 +974,20 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		goto bad_slab_pool;
 	}
 
+	cc->dmreq_start = sizeof(struct ablkcipher_request);
+	cc->dmreq_start += crypto_ablkcipher_reqsize(tfm);
+	cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
+	cc->dmreq_start += crypto_ablkcipher_alignmask(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;
+	}
+	cc->req = NULL;
+
 	cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
 	if (!cc->page_pool) {
 		ti->error = "Cannot allocate page mempool";
@@ -853,7 +1000,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		goto bad_bs;
 	}
 
-	if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
+	if (crypto_ablkcipher_setkey(tfm, cc->key, key_size) < 0) {
 		ti->error = "Error setting key";
 		goto bad_device;
 	}
@@ -914,12 +1061,14 @@ bad_device:
 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_blkcipher(tfm);
+	crypto_free_ablkcipher(tfm);
 bad_cipher:
 	/* Must zero key material before freeing */
 	memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
@@ -934,14 +1083,18 @@ static void crypt_dtr(struct dm_target *ti)
 	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_blkcipher(cc->tfm);
+	crypto_free_ablkcipher(cc->tfm);
 	dm_put_device(ti, cc->dev);
 
 	/* Must zero key material before freeing */
@@ -958,6 +1111,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
 	io = mempool_alloc(cc->io_pool, GFP_NOIO);
 	io->target = ti;
 	io->base_bio = bio;
+	io->sector = bio->bi_sector - ti->begin;
 	io->error = 0;
 	atomic_set(&io->pending, 0);
 
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 8fe81e1807e..5bbce29f143 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -449,7 +449,7 @@ static void persistent_destroy(struct exception_store *store)
 
 static int persistent_read_metadata(struct exception_store *store)
 {
-	int r, new_snapshot;
+	int r, uninitialized_var(new_snapshot);
 	struct pstore *ps = get_info(store);
 
 	/*
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 9627fa0f947..b262c0042de 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/dm-ioctl.h>
 #include <linux/hdreg.h>
+#include <linux/compat.h>
 
 #include <asm/uaccess.h>
 
@@ -702,7 +703,7 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
 	int r;
 	char *new_name = (char *) param + param->data_start;
 
-	if (new_name < (char *) param->data ||
+	if (new_name < param->data ||
 	    invalid_str(new_name, (void *) param + param_size)) {
 		DMWARN("Invalid new logical volume name supplied.");
 		return -EINVAL;
@@ -728,7 +729,7 @@ static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
 	if (!md)
 		return -ENXIO;
 
-	if (geostr < (char *) param->data ||
+	if (geostr < param->data ||
 	    invalid_str(geostr, (void *) param + param_size)) {
 		DMWARN("Invalid geometry supplied.");
 		goto out;
@@ -1350,10 +1351,10 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
 {
 	struct dm_ioctl tmp, *dmi;
 
-	if (copy_from_user(&tmp, user, sizeof(tmp)))
+	if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data)))
 		return -EFAULT;
 
-	if (tmp.data_size < sizeof(tmp))
+	if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data)))
 		return -EINVAL;
 
 	dmi = vmalloc(tmp.data_size);
@@ -1397,13 +1398,11 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
 	return 0;
 }
 
-static int ctl_ioctl(struct inode *inode, struct file *file,
-		     uint command, ulong u)
+static int ctl_ioctl(uint command, struct dm_ioctl __user *user)
 {
 	int r = 0;
 	unsigned int cmd;
-	struct dm_ioctl *param;
-	struct dm_ioctl __user *user = (struct dm_ioctl __user *) u;
+	struct dm_ioctl *uninitialized_var(param);
 	ioctl_fn fn = NULL;
 	size_t param_size;
 
@@ -1471,8 +1470,23 @@ static int ctl_ioctl(struct inode *inode, struct file *file,
 	return r;
 }
 
+static long dm_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+	return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u);
+}
+
+#ifdef CONFIG_COMPAT
+static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+	return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u));
+}
+#else
+#define dm_compat_ctl_ioctl NULL
+#endif
+
 static const struct file_operations _ctl_fops = {
-	.ioctl	 = ctl_ioctl,
+	.unlocked_ioctl	 = dm_ctl_ioctl,
+	.compat_ioctl = dm_compat_ctl_ioctl,
 	.owner	 = THIS_MODULE,
 };
 
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 072ee4353ea..2a74b2142f5 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -41,7 +41,7 @@ int dm_unregister_dirty_log_type(struct dirty_log_type *type)
 	return 0;
 }
 
-static struct dirty_log_type *get_type(const char *type_name)
+static struct dirty_log_type *_get_type(const char *type_name)
 {
 	struct dirty_log_type *type;
 
@@ -61,6 +61,55 @@ static struct dirty_log_type *get_type(const char *type_name)
 	return NULL;
 }
 
+/*
+ * get_type
+ * @type_name
+ *
+ * Attempt to retrieve the dirty_log_type by name.  If not already
+ * available, attempt to load the appropriate module.
+ *
+ * Log modules are named "dm-log-" followed by the 'type_name'.
+ * Modules may contain multiple types.
+ * This function will first try the module "dm-log-<type_name>",
+ * then truncate 'type_name' on the last '-' and try again.
+ *
+ * For example, if type_name was "clustered-disk", it would search
+ * 'dm-log-clustered-disk' then 'dm-log-clustered'.
+ *
+ * Returns: dirty_log_type* on success, NULL on failure
+ */
+static struct dirty_log_type *get_type(const char *type_name)
+{
+	char *p, *type_name_dup;
+	struct dirty_log_type *type;
+
+	type = _get_type(type_name);
+	if (type)
+		return type;
+
+	type_name_dup = kstrdup(type_name, GFP_KERNEL);
+	if (!type_name_dup) {
+		DMWARN("No memory left to attempt log module load for \"%s\"",
+		       type_name);
+		return NULL;
+	}
+
+	while (request_module("dm-log-%s", type_name_dup) ||
+	       !(type = _get_type(type_name))) {
+		p = strrchr(type_name_dup, '-');
+		if (!p)
+			break;
+		p[0] = '\0';
+	}
+
+	if (!type)
+		DMWARN("Module for logging type \"%s\" not found.", type_name);
+
+	kfree(type_name_dup);
+
+	return type;
+}
+
 static void put_type(struct dirty_log_type *type)
 {
 	spin_lock(&_lock);
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 24b2b1e32fa..e7ee59e655d 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -106,7 +106,7 @@ typedef int (*action_fn) (struct pgpath *pgpath);
 
 static struct kmem_cache *_mpio_cache;
 
-struct workqueue_struct *kmultipathd;
+static struct workqueue_struct *kmultipathd;
 static void process_queued_ios(struct work_struct *work);
 static void trigger_event(struct work_struct *work);
 
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 31123d4a6b9..edc057f5cdc 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -6,6 +6,7 @@
 
 #include "dm.h"
 #include "dm-bio-list.h"
+#include "dm-bi