Staging: dst: remove from the tree

DST is dead, no one is using it and upstream
has abandoned it, so remove it from the tree because
it is not going anywhere.

Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

10 files changed, 0 insertions, 3963 deletions

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index db0de940949..94eb86319ff 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -87,8 +87,6 @@ source "drivers/staging/frontier/Kconfig"
 
 source "drivers/staging/dream/Kconfig"
 
-source "drivers/staging/dst/Kconfig"
-
 source "drivers/staging/pohmelfs/Kconfig"
 
 source "drivers/staging/b3dfg/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 73c6a71155e..b5e67b889f6 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -26,7 +26,6 @@ obj-$(CONFIG_RTL8192E)		+= rtl8192e/
 obj-$(CONFIG_INPUT_MIMIO)	+= mimio/
 obj-$(CONFIG_TRANZPORT)		+= frontier/
 obj-$(CONFIG_DREAM)		+= dream/
-obj-$(CONFIG_DST)		+= dst/
 obj-$(CONFIG_POHMELFS)		+= pohmelfs/
 obj-$(CONFIG_B3DFG)		+= b3dfg/
 obj-$(CONFIG_IDE_PHISON)	+= phison/
diff --git a/drivers/staging/dst/Kconfig b/drivers/staging/dst/Kconfig
deleted file mode 100644
index 448d342ac2a..00000000000
--- a/drivers/staging/dst/Kconfig
+++ /dev/null
@@ -1,67 +0,0 @@
-config DST
-	tristate "Distributed storage"
-	depends on NET && CRYPTO && SYSFS && BLK_DEV
-	select CONNECTOR
-	---help---
-	DST is a network block device storage, which can be used to organize
-	exported storage on the remote nodes into the local block device.
-
-	DST works on top of any network media and protocol; it is just a matter
-	of configuration utility to understand the correct addresses. The most
-	common example is TCP over IP, which allows to pass through firewalls and
-	create remote backup storage in a different datacenter. DST requires
-	single port to be enabled on the exporting node and outgoing connections
-	on the local node.
-
-	DST works with in-kernel client and server, which improves performance by
-	eliminating unneded data copies and by not depending on the version
-	of the external IO components. It requires userspace configuration utility
-	though.
-
-	DST uses transaction model, when each store has to be explicitly acked
-	from the remote node to be considered as successfully written. There
-	may be lots of in-flight transactions. When remote host does not ack
-	the transaction it will be resent predefined number of times with specified
-	timeouts between them. All those parameters are configurable. Transactions
-	are marked as failed after all resends complete unsuccessfully; having
-	long enough resend timeout and/or large number of resends allows not to
-	return error to the higher (FS usually) layer in case of short network
-	problems or remote node outages. In case of network RAID setup this means
-	that storage will not degrade until transactions are marked as failed, and
-	thus will not force checksum recalculation and data rebuild. In case of
-	connection failure DST will try to reconnect to the remote node automatically.
-	DST sends ping commands at idle time to detect if remote node is alive.
-
-	Because of transactional model it is possible to use zero-copy sending
-	without worry of data corruption (which in turn could be detected by the
-	strong checksums though).
-
-	DST may fully encrypt the data channel in case of untrusted channel and implement
-	strong checksum of the transferred data. It is possible to configure algorithms
-	and crypto keys; they should match on both sides of the network channel.
-	Crypto processing does not introduce noticeble performance overhead, since DST
-	uses configurable pool of threads to perform crypto processing.
-
-	DST utilizes memory pool model of all its transaction allocations (it is the
-	only additional allocation on the client) and server allocations (bio pools,
-	while pages are allocated from the slab).
-
-	At startup DST performs a simple negotiation with the export node to determine
-	access permissions and size of the exported storage. It can be extended if
-	new parameters should be autonegotiated.
-
-	DST carries block IO flags in the protocol, which allows to transparently implement
-	barriers and sync/flush operations. Those flags are used in the export node where
-	IO against the local storage is performed, which means that sync write will be sync
-	on the remote node too, which in turn improves data integrity and improved resistance
-	to errors and data corruption during power outages or storage damages.
-
-	Homepage: http://www.ioremap.net/projects/dst
-	Userspace configuration utility and the latest releases: http://www.ioremap.net/archive/dst/
-
-config DST_DEBUG
-	bool "DST debug"
-	depends on DST
-	---help---
-	This option will enable HEAVY debugging of the DST.
-	Turn it on ONLY if you have to debug some really obscure problem.
diff --git a/drivers/staging/dst/Makefile b/drivers/staging/dst/Makefile
deleted file mode 100644
index 3a8b0cf9643..00000000000
--- a/drivers/staging/dst/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-obj-$(CONFIG_DST) += nst.o
-
-nst-y := dcore.o state.o export.o thread_pool.o crypto.o trans.o
diff --git a/drivers/staging/dst/crypto.c b/drivers/staging/dst/crypto.c
deleted file mode 100644
index 351295c97a4..00000000000
--- a/drivers/staging/dst/crypto.c
+++ /dev/null
@@ -1,733 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bio.h>
-#include <linux/crypto.h>
-#include <linux/dst.h>
-#include <linux/kernel.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-/*
- * Tricky bastard, but IV can be more complex with time...
- */
-static inline u64 dst_gen_iv(struct dst_trans *t)
-{
-	return t->gen;
-}
-
-/*
- * Crypto machinery: hash/cipher support for the given crypto controls.
- */
-static struct crypto_hash *dst_init_hash(struct dst_crypto_ctl *ctl, u8 *key)
-{
-	int err;
-	struct crypto_hash *hash;
-
-	hash = crypto_alloc_hash(ctl->hash_algo, 0, CRYPTO_ALG_ASYNC);
-	if (IS_ERR(hash)) {
-		err = PTR_ERR(hash);
-		dprintk("%s: failed to allocate hash '%s', err: %d.\n",
-				__func__, ctl->hash_algo, err);
-		goto err_out_exit;
-	}
-
-	ctl->crypto_attached_size = crypto_hash_digestsize(hash);
-
-	if (!ctl->hash_keysize)
-		return hash;
-
-	err = crypto_hash_setkey(hash, key, ctl->hash_keysize);
-	if (err) {
-		dprintk("%s: failed to set key for hash '%s', err: %d.\n",
-				__func__, ctl->hash_algo, err);
-		goto err_out_free;
-	}
-
-	return hash;
-
-err_out_free:
-	crypto_free_hash(hash);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-static struct crypto_ablkcipher *dst_init_cipher(struct dst_crypto_ctl *ctl,
-		u8 *key)
-{
-	int err = -EINVAL;
-	struct crypto_ablkcipher *cipher;
-
-	if (!ctl->cipher_keysize)
-		goto err_out_exit;
-
-	cipher = crypto_alloc_ablkcipher(ctl->cipher_algo, 0, 0);
-	if (IS_ERR(cipher)) {
-		err = PTR_ERR(cipher);
-		dprintk("%s: failed to allocate cipher '%s', err: %d.\n",
-				__func__, ctl->cipher_algo, err);
-		goto err_out_exit;
-	}
-
-	crypto_ablkcipher_clear_flags(cipher, ~0);
-
-	err = crypto_ablkcipher_setkey(cipher, key, ctl->cipher_keysize);
-	if (err) {
-		dprintk("%s: failed to set key for cipher '%s', err: %d.\n",
-				__func__, ctl->cipher_algo, err);
-		goto err_out_free;
-	}
-
-	return cipher;
-
-err_out_free:
-	crypto_free_ablkcipher(cipher);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-/*
- * Crypto engine has a pool of pages to encrypt data into before sending
- * it over the network. This pool is freed/allocated here.
- */
-static void dst_crypto_pages_free(struct dst_crypto_engine *e)
-{
-	unsigned int i;
-
-	for (i = 0; i < e->page_num; ++i)
-		__free_page(e->pages[i]);
-	kfree(e->pages);
-}
-
-static int dst_crypto_pages_alloc(struct dst_crypto_engine *e, int num)
-{
-	int i;
-
-	e->pages = kmalloc(num * sizeof(struct page **), GFP_KERNEL);
-	if (!e->pages)
-		return -ENOMEM;
-
-	for (i = 0; i < num; ++i) {
-		e->pages[i] = alloc_page(GFP_KERNEL);
-		if (!e->pages[i])
-			goto err_out_free_pages;
-	}
-
-	e->page_num = num;
-	return 0;
-
-err_out_free_pages:
-	while (--i >= 0)
-		__free_page(e->pages[i]);
-
-	kfree(e->pages);
-	return -ENOMEM;
-}
-
-/*
- * Initialize crypto engine for given node.
- * Setup cipher/hash, keys, pool of threads and private data.
- */
-static int dst_crypto_engine_init(struct dst_crypto_engine *e,
-		struct dst_node *n)
-{
-	int err;
-	struct dst_crypto_ctl *ctl = &n->crypto;
-
-	err = dst_crypto_pages_alloc(e, n->max_pages);
-	if (err)
-		goto err_out_exit;
-
-	e->size = PAGE_SIZE;
-	e->data = kmalloc(e->size, GFP_KERNEL);
-	if (!e->data) {
-		err = -ENOMEM;
-		goto err_out_free_pages;
-	}
-
-	if (ctl->hash_algo[0]) {
-		e->hash = dst_init_hash(ctl, n->hash_key);
-		if (IS_ERR(e->hash)) {
-			err = PTR_ERR(e->hash);
-			e->hash = NULL;
-			goto err_out_free;
-		}
-	}
-
-	if (ctl->cipher_algo[0]) {
-		e->cipher = dst_init_cipher(ctl, n->cipher_key);
-		if (IS_ERR(e->cipher)) {
-			err = PTR_ERR(e->cipher);
-			e->cipher = NULL;
-			goto err_out_free_hash;
-		}
-	}
-
-	return 0;
-
-err_out_free_hash:
-	crypto_free_hash(e->hash);
-err_out_free:
-	kfree(e->data);
-err_out_free_pages:
-	dst_crypto_pages_free(e);
-err_out_exit:
-	return err;
-}
-
-static void dst_crypto_engine_exit(struct dst_crypto_engine *e)
-{
-	if (e->hash)
-		crypto_free_hash(e->hash);
-	if (e->cipher)
-		crypto_free_ablkcipher(e->cipher);
-	dst_crypto_pages_free(e);
-	kfree(e->data);
-}
-
-/*
- * Waiting for cipher processing to be completed.
- */
-struct dst_crypto_completion {
-	struct completion		complete;
-	int				error;
-};
-
-static void dst_crypto_complete(struct crypto_async_request *req, int err)
-{
-	struct dst_crypto_completion *c = req->data;
-
-	if (err == -EINPROGRESS)
-		return;
-
-	dprintk("%s: req: %p, err: %d.\n", __func__, req, err);
-	c->error = err;
-	complete(&c->complete);
-}
-
-static int dst_crypto_process(struct ablkcipher_request *req,
-		struct scatterlist *sg_dst, struct scatterlist *sg_src,
-		void *iv, int enc, unsigned long timeout)
-{
-	struct dst_crypto_completion c;
-	int err;
-
-	init_completion(&c.complete);
-	c.error = -EINPROGRESS;
-
-	ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
-					dst_crypto_complete, &c);
-
-	ablkcipher_request_set_crypt(req, sg_src, sg_dst, sg_src->length, iv);
-
-	if (enc)
-		err = crypto_ablkcipher_encrypt(req);
-	else
-		err = crypto_ablkcipher_decrypt(req);
-
-	switch (err) {
-	case -EINPROGRESS:
-	case -EBUSY:
-		err = wait_for_completion_interruptible_timeout(&c.complete,
-				timeout);
-		if (!err)
-			err = -ETIMEDOUT;
-		else
-			err = c.error;
-		break;
-	default:
-		break;
-	}
-
-	return err;
-}
-
-/*
- * DST uses generic iteration approach for data crypto processing.
- * Single block IO request is switched into array of scatterlists,
- * which are submitted to the crypto processing iterator.
- *
- * Input and output iterator initialization are different, since
- * in output case we can not encrypt data in-place and need a
- * temporary storage, which is then being sent to the remote peer.
- */
-static int dst_trans_iter_out(struct bio *bio, struct dst_crypto_engine *e,
-		int (*iterator) (struct dst_crypto_engine *e,
-				  struct scatterlist *dst,
-				  struct scatterlist *src))
-{
-	struct bio_vec *bv;
-	int err, i;
-
-	sg_init_table(e->src, bio->bi_vcnt);
-	sg_init_table(e->dst, bio->bi_vcnt);
-
-	bio_for_each_segment(bv, bio, i) {
-		sg_set_page(&e->src[i], bv->bv_page, bv->bv_len, bv->bv_offset);
-		sg_set_page(&e->dst[i], e->pages[i], bv->bv_len, bv->bv_offset);
-
-		err = iterator(e, &e->dst[i], &e->src[i]);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
-static int dst_trans_iter_in(struct bio *bio, struct dst_crypto_engine *e,
-		int (*iterator) (struct dst_crypto_engine *e,
-				  struct scatterlist *dst,
-				  struct scatterlist *src))
-{
-	struct bio_vec *bv;
-	int err, i;
-
-	sg_init_table(e->src, bio->bi_vcnt);
-	sg_init_table(e->dst, bio->bi_vcnt);
-
-	bio_for_each_segment(bv, bio, i) {
-		sg_set_page(&e->src[i], bv->bv_page, bv->bv_len, bv->bv_offset);
-		sg_set_page(&e->dst[i], bv->bv_page, bv->bv_len, bv->bv_offset);
-
-		err = iterator(e, &e->dst[i], &e->src[i]);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
-static int dst_crypt_iterator(struct dst_crypto_engine *e,
-		struct scatterlist *sg_dst, struct scatterlist *sg_src)
-{
-	struct ablkcipher_request *req = e->data;
-	u8 iv[32];
-
-	memset(iv, 0, sizeof(iv));
-
-	memcpy(iv, &e->iv, sizeof(e->iv));
-
-	return dst_crypto_process(req, sg_dst, sg_src, iv, e->enc, e->timeout);
-}
-
-static int dst_crypt(struct dst_crypto_engine *e, struct bio *bio)
-{
-	struct ablkcipher_request *req = e->data;
-
-	memset(req, 0, sizeof(struct ablkcipher_request));
-	ablkcipher_request_set_tfm(req, e->cipher);
-
-	if (e->enc)
-		return dst_trans_iter_out(bio, e, dst_crypt_iterator);
-	else
-		return dst_trans_iter_in(bio, e, dst_crypt_iterator);
-}
-
-static int dst_hash_iterator(struct dst_crypto_engine *e,
-		struct scatterlist *sg_dst, struct scatterlist *sg_src)
-{
-	return crypto_hash_update(e->data, sg_src, sg_src->length);
-}
-
-static int dst_hash(struct dst_crypto_engine *e, struct bio *bio, void *dst)
-{
-	struct hash_desc *desc = e->data;
-	int err;
-
-	desc->tfm = e->hash;
-	desc->flags = 0;
-
-	err = crypto_hash_init(desc);
-	if (err)
-		return err;
-
-	err = dst_trans_iter_in(bio, e, dst_hash_iterator);
-	if (err)
-		return err;
-
-	err = crypto_hash_final(desc, dst);
-	if (err)
-		return err;
-
-	return 0;
-}
-
-/*
- * Initialize/cleanup a crypto thread. The only thing it should
- * do is to allocate a pool of pages as temporary storage.
- * And to setup cipher and/or hash.
- */
-static void *dst_crypto_thread_init(void *data)
-{
-	struct dst_node *n = data;
-	struct dst_crypto_engine *e;
-	int err = -ENOMEM;
-
-	e = kzalloc(sizeof(struct dst_crypto_engine), GFP_KERNEL);
-	if (!e)
-		goto err_out_exit;
-	e->src = kcalloc(2 * n->max_pages, sizeof(struct scatterlist),
-			GFP_KERNEL);
-	if (!e->src)
-		goto err_out_free;
-
-	e->dst = e->src + n->max_pages;
-
-	err = dst_crypto_engine_init(e, n);
-	if (err)
-		goto err_out_free_all;
-
-	return e;
-
-err_out_free_all:
-	kfree(e->src);
-err_out_free:
-	kfree(e);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-static void dst_crypto_thread_cleanup(void *private)
-{
-	struct dst_crypto_engine *e = private;
-
-	dst_crypto_engine_exit(e);
-	kfree(e->src);
-	kfree(e);
-}
-
-/*
- * Initialize crypto engine for given node: store keys, create pool
- * of threads, initialize each one.
- *
- * Each thread has unique ID, but 0 and 1 are reserved for receiving and
- * accepting threads (if export node), so IDs could start from 2, but starting
- * them from 10 allows easily understand what this thread is for.
- */
-int dst_node_crypto_init(struct dst_node *n, struct dst_crypto_ctl *ctl)
-{
-	void *key = (ctl + 1);
-	int err = -ENOMEM, i;
-	char name[32];
-
-	if (ctl->hash_keysize) {
-		n->hash_key = kmalloc(ctl->hash_keysize, GFP_KERNEL);
-		if (!n->hash_key)
-			goto err_out_exit;
-		memcpy(n->hash_key, key, ctl->hash_keysize);
-	}
-
-	if (ctl->cipher_keysize) {
-		n->cipher_key = kmalloc(ctl->cipher_keysize, GFP_KERNEL);
-		if (!n->cipher_key)
-			goto err_out_free_hash;
-		memcpy(n->cipher_key, key, ctl->cipher_keysize);
-	}
-	memcpy(&n->crypto, ctl, sizeof(struct dst_crypto_ctl));
-
-	for (i = 0; i < ctl->thread_num; ++i) {
-		snprintf(name, sizeof(name), "%s-crypto-%d", n->name, i);
-		/* Unique ids... */
-		err = thread_pool_add_worker(n->pool, name, i + 10,
-			dst_crypto_thread_init, dst_crypto_thread_cleanup, n);
-		if (err)
-			goto err_out_free_threads;
-	}
-
-	return 0;
-
-err_out_free_threads:
-	while (--i >= 0)
-		thread_pool_del_worker_id(n->pool, i+10);
-
-	if (ctl->cipher_keysize)
-		kfree(n->cipher_key);
-	ctl->cipher_keysize = 0;
-err_out_free_hash:
-	if (ctl->hash_keysize)
-		kfree(n->hash_key);
-	ctl->hash_keysize = 0;
-err_out_exit:
-	return err;
-}
-
-void dst_node_crypto_exit(struct dst_node *n)
-{
-	struct dst_crypto_ctl *ctl = &n->crypto;
-
-	if (ctl->cipher_algo[0] || ctl->hash_algo[0]) {
-		kfree(n->hash_key);
-		kfree(n->cipher_key);
-	}
-}
-
-/*
- * Thrad pool setup callback. Just stores a transaction in private data.
- */
-static int dst_trans_crypto_setup(void *crypto_engine, void *trans)
-{
-	struct dst_crypto_engine *e = crypto_engine;
-
-	e->private = trans;
-	return 0;
-}
-
-#if 0
-static void dst_dump_bio(struct bio *bio)
-{
-	u8 *p;
-	struct bio_vec *bv;
-	int i;
-
-	bio_for_each_segment(bv, bio, i) {
-		dprintk("%s: %llu/%u: size: %u, offset: %u, data: ",
-				__func__, bio->bi_sector, bio->bi_size,
-				bv->bv_len, bv->bv_offset);
-
-		p = kmap(bv->bv_page) + bv->bv_offset;
-		for (i = 0; i < bv->bv_len; ++i)
-			printk(KERN_DEBUG "%02x ", p[i]);
-		kunmap(bv->bv_page);
-		printk("\n");
-	}
-}
-#endif
-
-/*
- * Encrypt/hash data and send it to the network.
- */
-static int dst_crypto_process_sending(struct dst_crypto_engine *e,
-		struct bio *bio, u8 *hash)
-{
-	int err;
-
-	if (e->cipher) {
-		err = dst_crypt(e, bio);
-		if (err)
-			goto err_out_exit;
-	}
-
-	if (e->hash) {
-		err = dst_hash(e, bio, hash);
-		if (err)
-			goto err_out_exit;
-
-#ifdef CONFIG_DST_DEBUG
-		{
-			unsigned int i;
-
-			/* dst_dump_bio(bio); */
-
-			printk(KERN_DEBUG "%s: bio: %llu/%u, rw: %lu, hash: ",
-				__func__, (u64)bio->bi_sector,
-				bio->bi_size, bio_data_dir(bio));
-			for (i = 0; i < crypto_hash_digestsize(e->hash); ++i)
-					printk("%02x ", hash[i]);
-			printk("\n");
-		}
-#endif
-	}
-
-	return 0;
-
-err_out_exit:
-	return err;
-}
-
-/*
- * Check if received data is valid. Decipher if it is.
- */
-static int dst_crypto_process_receiving(struct dst_crypto_engine *e,
-		struct bio *bio, u8 *hash, u8 *recv_hash)
-{
-	int err;
-
-	if (e->hash) {
-		int mismatch;
-
-		err = dst_hash(e, bio, hash);
-		if (err)
-			goto err_out_exit;
-
-		mismatch = !!memcmp(recv_hash, hash,
-				crypto_hash_digestsize(e->hash));
-#ifdef CONFIG_DST_DEBUG
-		/* dst_dump_bio(bio); */
-
-		printk(KERN_DEBUG "%s: bio: %llu/%u, rw: %lu, hash mismatch: %d",
-			__func__, (u64)bio->bi_sector, bio->bi_size,
-			bio_data_dir(bio), mismatch);
-		if (mismatch) {
-			unsigned int i;
-
-			printk(", recv/calc: ");
-			for (i = 0; i < crypto_hash_digestsize(e->hash); ++i)
-				printk("%02x/%02x ", recv_hash[i], hash[i]);
-
-		}
-		printk("\n");
-#endif
-		err = -1;
-		if (mismatch)
-			goto err_out_exit;
-	}
-
-	if (e->cipher) {
-		err = dst_crypt(e, bio);
-		if (err)
-			goto err_out_exit;
-	}
-
-	return 0;
-
-err_out_exit:
-	return err;
-}
-
-/*
- * Thread pool callback to encrypt data and send it to the netowork.
- */
-static int dst_trans_crypto_action(void *crypto_engine, void *schedule_data)
-{
-	struct dst_crypto_engine *e = crypto_engine;
-	struct dst_trans *t = schedule_data;
-	struct bio *bio = t->bio;
-	int err;
-
-	dprintk("%s: t: %p, gen: %llu, cipher: %p, hash: %p.\n",
-			__func__, t, t->gen, e->cipher, e->hash);
-
-	e->enc = t->enc;
-	e->iv = dst_gen_iv(t);
-
-	if (bio_data_dir(bio) == WRITE) {
-		err = dst_crypto_process_sending(e, bio, t->cmd.hash);
-		if (err)
-			goto err_out_exit;
-
-		if (e->hash) {
-			t->cmd.csize = crypto_hash_digestsize(e->hash);
-			t->cmd.size += t->cmd.csize;
-		}
-
-		return dst_trans_send(t);
-	} else {
-		u8 *hash = e->data + e->size/2;
-
-		err = dst_crypto_process_receiving(e, bio, hash, t->cmd.hash);
-		if (err)
-			goto err_out_exit;
-
-		dst_trans_remove(t);
-		dst_trans_put(t);
-	}
-
-	return 0;
-
-err_out_exit:
-	t->error = err;
-	dst_trans_put(t);
-	return err;
-}
-
-/*
- * Schedule crypto processing for given transaction.
- */
-int dst_trans_crypto(struct dst_trans *t)
-{
-	struct dst_node *n = t->n;
-	int err;
-
-	err = thread_pool_schedule(n->pool,
-		dst_trans_crypto_setup, dst_trans_crypto_action,
-		t, MAX_SCHEDULE_TIMEOUT);
-	if (err)
-		goto err_out_exit;
-
-	return 0;
-
-err_out_exit:
-	dst_trans_put(t);
-	return err;
-}
-
-/*
- * Crypto machinery for the export node.
- */
-static int dst_export_crypto_setup(void *crypto_engine, void *bio)
-{
-	struct dst_crypto_engine *e = crypto_engine;
-
-	e->private = bio;
-	return 0;
-}
-
-static int dst_export_crypto_action(void *crypto_engine, void *schedule_data)
-{
-	struct dst_crypto_engine *e = crypto_engine;
-	struct bio *bio = schedule_data;
-	struct dst_export_priv *p = bio->bi_private;
-	int err;
-
-	dprintk("%s: e: %p, data: %p, bio: %llu/%u, dir: %lu.\n",
-			__func__, e, e->data, (u64)bio->bi_sector,
-			bio->bi_size, bio_data_dir(bio));
-
-	e->enc = (bio_data_dir(bio) == READ);
-	e->iv = p->cmd.id;
-
-	if (bio_data_dir(bio) == WRITE) {
-		u8 *hash = e->data + e->size/2;
-
-		err = dst_crypto_process_receiving(e, bio, hash, p->cmd.hash);
-		if (err)
-			goto err_out_exit;
-
-		generic_make_request(bio);
-	} else {
-		err = dst_crypto_process_sending(e, bio, p->cmd.hash);
-		if (err)
-			goto err_out_exit;
-
-		if (e->hash) {
-			p->cmd.csize = crypto_hash_digestsize(e->hash);
-			p->cmd.size += p->cmd.csize;
-		}
-
-		err = dst_export_send_bio(bio);
-	}
-	return 0;
-
-err_out_exit:
-	bio_put(bio);
-	return err;
-}
-
-int dst_export_crypto(struct dst_node *n, struct bio *bio)
-{
-	int err;
-
-	err = thread_pool_schedule(n->pool,
-		dst_export_crypto_setup, dst_export_crypto_action,
-		bio, MAX_SCHEDULE_TIMEOUT);
-	if (err)
-		goto err_out_exit;
-
-	return 0;
-
-err_out_exit:
-	bio_put(bio);
-	return err;
-}
diff --git a/drivers/staging/dst/dcore.c b/drivers/staging/dst/dcore.c
deleted file mode 100644
index c83ca7e3d04..00000000000
--- a/drivers/staging/dst/dcore.c
+++ /dev/null
@@ -1,968 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/blkdev.h>
-#include <linux/bio.h>
-#include <linux/buffer_head.h>
-#include <linux/connector.h>
-#include <linux/dst.h>
-#include <linux/device.h>
-#include <linux/jhash.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-#include <linux/socket.h>
-
-#include <linux/in.h>
-#include <linux/in6.h>
-
-#include <net/sock.h>
-
-static int dst_major;
-
-static DEFINE_MUTEX(dst_hash_lock);
-static struct list_head *dst_hashtable;
-static unsigned int dst_hashtable_size = 128;
-module_param(dst_hashtable_size, uint, 0644);
-
-static char dst_name[] = "Dementianting goldfish";
-
-static DEFINE_IDR(dst_index_idr);
-static struct cb_id cn_dst_id = { CN_DST_IDX, CN_DST_VAL };
-
-/*
- * DST sysfs tree for device called 'storage':
- *
- * /sys/bus/dst/devices/storage/
- * /sys/bus/dst/devices/storage/type : 192.168.4.80:1025
- * /sys/bus/dst/devices/storage/size : 800
- * /sys/bus/dst/devices/storage/name : storage
- */
-
-static int dst_dev_match(struct device *dev, struct device_driver *drv)
-{
-	return 1;
-}
-
-static struct bus_type dst_dev_bus_type = {
-	.name 		= "dst",
-	.match 		= &dst_dev_match,
-};
-
-static void dst_node_release(struct device *dev)
-{
-	struct dst_info *info = container_of(dev, struct dst_info, device);
-
-	kfree(info);
-}
-
-static struct device dst_node_dev = {
-	.bus 		= &dst_dev_bus_type,
-	.release 	= &dst_node_release
-};
-
-/*
- * Setting size of the node after it was changed.
- */
-static void dst_node_set_size(struct dst_node *n)
-{
-	struct block_device *bdev;
-
-	set_capacity(n->disk, n->size >> 9);
-
-	bdev = bdget_disk(n->disk, 0);
-	if (bdev) {
-		mutex_lock(&bdev->bd_inode->i_mutex);
-		i_size_write(bdev->bd_inode, n->size);
-		mutex_unlock(&bdev->bd_inode->i_mutex);
-		bdput(bdev);
-	}
-}
-
-/*
- * Distributed storage request processing function.
- */
-static int dst_request(struct request_queue *q, struct bio *bio)
-{
-	struct dst_node *n = q->queuedata;
-	int err = -EIO;
-
-	if (bio_empty_barrier(bio) && !blk_queue_discard(q)) {
-		/*
-		 * This is a dirty^Wnice hack, but if we complete this
-		 * operation with -EOPNOTSUPP like intended, XFS
-		 * will stuck and freeze the machine. This may be
-		 * not particulary XFS problem though, but it is the
-		 * only FS which sends empty barrier at umount time
-		 * I worked with.
-		 *
-		 * Empty barriers are not allowed anyway, see 51fd77bd9f512
-		 * for example, although later it was changed to
-		 * bio_rw_flagged(bio, BIO_RW_DISCARD) only, which does not
-		 * work in this case.
-		 */
-		/* err = -EOPNOTSUPP; */
-		err = 0;
-		goto end_io;
-	}
-
-	bio_get(bio);
-
-	return dst_process_bio(n, bio);
-
-end_io:
-	bio_endio(bio, err);
-	return err;
-}
-
-/*
- * Open/close callbacks for appropriate block device.
- */
-static int dst_bdev_open(struct block_device *bdev, fmode_t mode)
-{
-	struct dst_node *n = bdev->bd_disk->private_data;
-
-	dst_node_get(n);
-	return 0;
-}
-
-static int dst_bdev_release(struct gendisk *disk, fmode_t mode)
-{
-	struct dst_node *n = disk->private_data;
-
-	dst_node_put(n);
-	return 0;
-}
-
-static struct block_device_operations dst_blk_ops = {
-	.open		= dst_bdev_open,
-	.release	= dst_bdev_release,
-	.owner		= THIS_MODULE,
-};
-
-/*
- * Block layer binding - disk is created when array is fully configured
- * by userspace request.
- */
-static int dst_node_create_disk(struct dst_node *n)
-{
-	int err = -ENOMEM;
-	u32 index = 0;
-
-	n->queue = blk_init_queue(NULL, NULL);
-	if (!n->queue)
-		goto err_out_exit;
-
-	n->queue->queuedata = n;
-	blk_queue_make_request(n->queue, dst_request);
-	blk_queue_max_phys_segments(n->queue, n->max_pages);
-	blk_queue_max_hw_segments(n->queue, n->max_pages);
-
-	err = -ENOMEM;
-	n->disk = alloc_disk(1);
-	if (!n->disk)
-		goto err_out_free_queue;
-
-	if (!(n->state->permissions & DST_PERM_WRITE)) {
-		printk(KERN_INFO "DST node %s attached read-only.\n", n->name);
-		set_disk_ro(n->disk, 1);
-	}
-
-	if (!idr_pre_get(&dst_index_idr, GFP_KERNEL))
-		goto err_out_put;
-
-	mutex_lock(&dst_hash_lock);
-	err = idr_get_new(&dst_index_idr, NULL, &index);
-	mutex_unlock(&dst_hash_lock);
-	if (err)
-		goto err_out_put;
-
-	n->disk->major = dst_major;
-	n->disk->first_minor = index;
-	n->disk->fops = &dst_blk_ops;
-	n->disk->queue = n->queue;
-	n->disk->private_data = n;
-	snprintf(n->disk->disk_name, sizeof(n->disk->disk_name),
-			"dst-%s", n->name);
-
-	return 0;
-
-err_out_put:
-	put_disk(n->disk);
-err_out_free_queue:
-	blk_cleanup_queue(n->queue);
-err_out_exit:
-	return err;
-}
-
-/*
- * Sysfs machinery: show device's size.
- */
-static ssize_t dst_show_size(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct dst_info *info = container_of(dev, struct dst_info, device);
-
-	return sprintf(buf, "%llu\n", info->size);
-}
-
-/*
- * Show local exported device.
- */
-static ssize_t dst_show_local(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct dst_info *info = container_of(dev, struct dst_info, device);
-
-	return sprintf(buf, "%s\n", info->local);
-}
-
-/*
- * Shows type of the remote node - device major/minor number
- * for local nodes and address (af_inet ipv4/ipv6 only) for remote nodes.
- */
-static ssize_t dst_show_type(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct dst_info *info = container_of(dev, struct dst_info, device);
-	int family = info->net.addr.sa_family;
-
-	if (family == AF_INET) {
-		struct sockaddr_in *sin = (struct sockaddr_in *)&info->net.addr;
-		return sprintf(buf, "%u.%u.%u.%u:%d\n",
-			NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port));
-	} else if (family == AF_INET6) {
-		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)
-				&info->net.addr;
-		return sprintf(buf,
-			"%pi6:%d\n",
-			&sin->sin6_addr, ntohs(sin->sin6_port));
-	} else {
-		int i, sz = PAGE_SIZE - 2; /* 0 symbol and '\n' below */
-		int size, addrlen = info->net.addr.sa_data_len;
-		unsigned char *a = (unsigned char *)&info->net.addr.sa_data;
-		char *buf_orig = buf;
-
-		size = snprintf(buf, sz, "family: %d, addrlen: %u, addr: ",
-				family, addrlen);
-		sz -= size;
-		buf += size;
-
-		for (i = 0; i < addrlen; ++i) {
-			if (sz < 3)
-				break;
-
-			size = snprintf(buf, sz, "%02x ", a[i]);
-			sz -= size;
-			buf += size;
-		}
-		buf += sprintf(buf, "\n");
-
-		return buf - buf_orig;
-	}
-	return 0;
-}
-
-static struct device_attribute dst_node_attrs[] = {
-	__ATTR(size, 0444, dst_show_size, NULL),
-	__ATTR(type, 0444, dst_show_type, NULL),
-	__ATTR(local, 0444, dst_show_local, NULL),
-};
-
-static int dst_create_node_attributes(struct dst_node *n)
-{
-	int err, i;
-
-	for (i = 0; i < ARRAY_SIZE(dst_node_attrs); ++i) {
-		err = device_create_file(&n->info->device,
-				&dst_node_attrs[i]);
-		if (err)
-			goto err_out_remove_all;
-	}
-	return 0;
-
-err_out_remove_all:
-	while (--i >= 0)
-		device_remove_file(&n->info->device,
-				&dst_node_attrs[i]);
-
-	return err;
-}
-
-static void dst_remove_node_attributes(struct dst_node *n)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(dst_node_attrs); ++i)
-		device_remove_file(&n->info->device,
-				&dst_node_attrs[i]);
-}
-
-/*
- * Sysfs cleanup and initialization.
- * Shows number of useful parameters.
- */
-static void dst_node_sysfs_exit(struct dst_node *n)
-{
-	if (n->info) {
-		dst_remove_node_attributes(n);
-		device_unregister(&n->info->device);
-		n->info = NULL;
-	}
-}
-
-static int dst_node_sysfs_init(struct dst_node *n)
-{
-	int err;
-
-	n->info = kzalloc(sizeof(struct dst_info), GFP_KERNEL);
-	if (!n->info)
-		return -ENOMEM;
-
-	memcpy(&n->info->device, &dst_node_dev, sizeof(struct device));
-	n->info->size = n->size;
-
-	dev_set_name(&n->info->device, "dst-%s", n->name);
-	err = device_register(&n->info->device);
-	if (err) {
-		dprintk(KERN_ERR "Failed to register node '%s', err: %d.\n",
-				n->name, err);
-		goto err_out_exit;
-	}
-
-	dst_create_node_attributes(n);
-
-	return 0;
-
-err_out_exit:
-	kfree(n->info);
-	n->info = NULL;
-	return err;
-}
-
-/*
- * DST node hash tables machinery.
- */
-static inline unsigned int dst_hash(char *str, unsigned int size)
-{
-	return jhash(str, size, 0) % dst_hashtable_size;
-}
-
-static void dst_node_remove(struct dst_node *n)
-{
-	mutex_lock(&dst_hash_lock);
-	list_del_init(&n->node_entry);
-	mutex_unlock(&dst_hash_lock);
-}
-
-static void dst_node_add(struct dst_node *n)
-{
-	unsigned hash = dst_hash(n->name, sizeof(n->name));
-
-	mutex_lock(&dst_hash_lock);
-	list_add_tail(&n->node_entry, &dst_hashtable[hash]);
-	mutex_unlock(&dst_hash_lock);
-}
-
-/*
- * Cleaning node when it is about to be freed.
- * There are still users of the socket though,
- * so connection cleanup should be protected.
- */
-static void dst_node_cleanup(struct dst_node *n)
-{
-	struct dst_state *st = n->state;
-
-	if (!st)
-		return;
-
-	if (n->queue) {
-		blk_cleanup_queue(n->queue);
-
-		mutex_lock(&dst_hash_lock);
-		idr_remove(&dst_index_idr, n->disk->first_minor);
-		mutex_unlock(&dst_hash_lock);
-
-		put_disk(n->disk);
-	}
-
-	if (n->bdev) {
-		sync_blockdev(n->bdev);
-		close_bdev_exclusive(n->bdev, FMODE_READ|FMODE_WRITE);
-	}
-
-	dst_state_lock(st);
-	st->need_exit = 1;
-	dst_state_exit_connected(st);
-	dst_state_unlock(st);
-
-	wake_up(&st->thread_wait);
-
-	dst_state_put(st);
-	n->state = NULL;
-}
-
-/*
- * Free security attributes attached to given node.
- */
-static void dst_security_exit(struct dst_node *n)
-{
-	struct dst_secure *s, *tmp;
-
-	list_for_each_entry_safe(s, tmp, &n->security_list, sec_entry) {
-		list_del(&s->sec_entry);
-		kfree(s);
-	}
-}
-
-/*
- * Free node when there are no more users.
- * Actually node has to be freed on behalf od userspace process,
- * since there are number of threads, which are embedded in the
- * node, so they can not exit and free node from there, that is
- * why there is a wakeup if reference counter is not equal to zero.
- */
-void dst_node_put(struct dst_node *n)
-{
-	if (unlikely(!n))
-		return;
-
-	dprintk("%s: n: %p, refcnt: %d.\n",
-			__func__, n, atomic_read(&n->refcnt));
-
-	if (atomic_dec_and_test(&n->refcnt)) {
-		dst_node_remove(n);
-		n->trans_scan_timeout = 0;
-		dst_node_cleanup(n);
-		thread_pool_destroy(n->pool);
-		dst_node_sysfs_exit(n);
-		dst_node_crypto_exit(n);
-		dst_security_exit(n);
-		dst_node_trans_exit(n);
-
-		kfree(n);
-
-		dprintk("%s: freed n: %p.\n", __func__, n);
-	} else {
-		wake_up(&n->wait);
-	}
-}
-
-/*
- * Setting up export device: lookup by the name, get its size
- * and setup listening socket, which will accept clients, which
- * will submit IO for given storage.
- */
-static int dst_setup_export(struct dst_node *n, struct dst_ctl *ctl,
-		struct dst_export_ctl *le)
-{
-	int err;
-
-	snprintf(n->info->local, sizeof(n->info->local), "%s", le->device);
-
-	n->bdev = open_bdev_exclusive(le->device, FMODE_READ|FMODE_WRITE, NULL);
-	if (IS_ERR(n->bdev))
-		return PTR_ERR(n->bdev);
-
-	if (n->size != 0)
-		n->size = min_t(loff_t, n->bdev->bd_inode->i_size, n->size);
-	else
-		n->size = n->bdev->bd_inode->i_size;
-
-	n->info->size = n->size;
-	err = dst_node_init_listened(n, le);
-	if (err)
-		goto err_out_cleanup;
-
-	return 0;
-
-err_out_cleanup:
-	close_bdev_exclusive(n->bdev, FMODE_READ|FMODE_WRITE);
-	n->bdev = NULL;
-
-	return err;
-}
-
-/* Empty thread pool callbacks for the network processing threads. */
-static inline void *dst_thread_network_init(void *data)
-{
-	dprintk("%s: data: %p.\n", __func__, data);
-	return data;
-}
-
-static inline void dst_thread_network_cleanup(void *data)
-{
-	dprintk("%s: data: %p.\n", __func__, data);
-}
-
-/*
- * Allocate DST node and initialize some of its parameters.
- */
-static struct dst_node *dst_alloc_node(struct dst_ctl *ctl,
-		int (*start)(struct dst_node *),
-		int num)
-{
-	struct dst_node *n;
-	int err;
-
-	n = kzalloc(sizeof(struct dst_node), GFP_KERNEL);
-	if (!n)
-		return NULL;
-
-	INIT_LIST_HEAD(&n->node_entry);
-
-	INIT_LIST_HEAD(&n->security_list);
-	mutex_init(&n->security_lock);
-
-	init_waitqueue_head(&n->wait);
-
-	n->trans_scan_timeout = msecs_to_jiffies(ctl->trans_scan_timeout);
-	if (!n->trans_scan_timeout)
-		n->trans_scan_timeout = HZ;
-
-	n->trans_max_retries = ctl->trans_max_retries;
-	if (!n->trans_max_retries)
-		n->trans_max_retries = 10;
-
-	/*
-	 * Pretty much arbitrary default numbers.
-	 * 32 matches maximum number of pages in bio originated from ext3 (31).
-	 */
-	n->max_pages = ctl->max_pages;
-	if (!n->max_pages)
-		n->max_pages = 32;
-
-	if (n->max_pages > 1024)
-		n->max_pages = 1024;
-
-	n->start = start;
-	n->size = ctl->size;
-
-	atomic_set(&n->refcnt, 1);
-	atomic_long_set(&n->gen, 0);
-	snprintf(n->name, sizeof(n->name), "%s", ctl->name);
-
-	err = dst_node_sysfs_init(n);
-	if (err)
-		goto err_out_free;
-
-	n->pool = thread_pool_create(num, n->name, dst_thread_network_init,
-			dst_thread_network_cleanup, n);
-	if (IS_ERR(n->pool)) {
-		err = PTR_ERR(n->pool);
-		goto err_out_sysfs_exit;
-	}
-
-	dprintk("%s: n: %p, name: %s.\n", __func__, n, n->name);
-
-	return n;
-
-err_out_sysfs_exit:
-	dst_node_sysfs_exit(n);
-err_out_free:
-	kfree(n);
-	return NULL;
-}
-
-/*
- * Starting a node, connected to the remote server:
- * register block device and initialize transaction mechanism.
- * In revers order though.
- *
- * It will autonegotiate some parameters with the remote node
- * and update local if needed.
- *
- * Transaction initialization should be the last thing before
- * starting the node, since transaction should include not only
- * block IO, but also crypto related data (if any), which are
- * initialized separately.
- */
-static int dst_start_remote(struct dst_node *n)
-{
-	int err;
-
-	err = dst_node_trans_init(n, sizeof(struct dst_trans));
-	if (err)
-		return err;
-
-	err = dst_node_create_disk(n);
-	if (err)
-		return err;
-
-	dst_node_set_size(n);
-	add_disk(n->disk);
-
-	dprintk("DST: started remote node '%s', minor: %d.\n",
-			n->name, n->disk->first_minor);
-
-	return 0;
-}
-
-/*
- * Adding remote node and initialize connection.
- */
-static int dst_add_remote(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	int err;
-	struct dst_network_ctl *rctl = data;
-
-	if (n)
-		return -EEXIST;
-
-	if (size != sizeof(struct dst_network_ctl))
-		return -EINVAL;
-
-	n = dst_alloc_node(ctl, dst_start_remote, 1);
-	if (!n)
-		return -ENOMEM;
-
-	memcpy(&n->info->net, rctl, sizeof(struct dst_network_ctl));
-	err = dst_node_init_connected(n, rctl);
-	if (err)
-		goto err_out_free;
-
-	dst_node_add(n);
-
-	return 0;
-
-err_out_free:
-	dst_node_put(n);
-	return err;
-}
-
-/*
- * Adding export node: initializing block device and listening socket.
- */
-static int dst_add_export(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	int err;
-	struct dst_export_ctl *le = data;
-
-	if (n)
-		return -EEXIST;
-
-	if (size != sizeof(struct dst_export_ctl))
-		return -EINVAL;
-
-	n = dst_alloc_node(ctl, dst_start_export, 2);
-	if (!n)
-		return -EINVAL;
-
-	err = dst_setup_export(n, ctl, le);
-	if (err)
-		goto err_out_free;
-
-	dst_node_add(n);
-
-	return 0;
-
-err_out_free:
-	dst_node_put(n);
-	return err;
-}
-
-static int dst_node_remove_unload(struct dst_node *n)
-{
-	printk(KERN_INFO "STOPPED name: '%s', size: %llu.\n",
-			n->name, n->size);
-
-	if (n->disk)
-		del_gendisk(n->disk);
-
-	dst_node_remove(n);
-	dst_node_sysfs_exit(n);
-
-	/*
-	 * This is not a hack. Really.
-	 * Node's reference counter allows to implement fine grained
-	 * node freeing, but since all transactions (which hold node's
-	 * reference counter) are processed in the dedicated thread,
-	 * it is possible that reference will hit zero in that thread,
-	 * so we will not be able to exit thread and cleanup the node.
-	 *
-	 * So, we remove disk, so no new activity is possible, and
-	 * wait until all pending transaction are completed (either
-	 * in receiving thread or by timeout in workqueue), in this
-	 * case reference counter will be less or equal to 2 (once set in
-	 * dst_alloc_node() and then in connector message parser;
-	 * or when we force module unloading, and connector message
-	 * parser does not hold a reference, in this case reference
-	 * counter will be equal to 1),
-	 * and subsequent dst_node_put() calls will free the node.
-	 */
-	dprintk("%s: going to sleep with %d refcnt.\n",
-			__func__, atomic_read(&n->refcnt));
-	wait_event(n->wait, atomic_read(&n->refcnt) <= 2);
-
-	dst_node_put(n);
-	return 0;
-}
-
-/*
- * Remove node from the hash table.
- */
-static int dst_del_node(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	if (!n)
-		return -ENODEV;
-
-	return dst_node_remove_unload(n);
-}
-
-/*
- * Initialize crypto processing for given node.
- */
-static int dst_crypto_init(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	struct dst_crypto_ctl *crypto = data;
-
-	if (!n)
-		return -ENODEV;
-
-	if (size != sizeof(struct dst_crypto_ctl) + crypto->hash_keysize +
-			crypto->cipher_keysize)
-		return -EINVAL;
-
-	if (n->trans_cache)
-		return -EEXIST;
-
-	return dst_node_crypto_init(n, crypto);
-}
-
-/*
- * Security attributes for given node.
- */
-static int dst_security_init(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	struct dst_secure *s;
-
-	if (!n)
-		return -ENODEV;
-
-	if (size != sizeof(struct dst_secure_user))
-		return -EINVAL;
-
-	s = kmalloc(sizeof(struct dst_secure), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-
-	memcpy(&s->sec, data, size);
-
-	mutex_lock(&n->security_lock);
-	list_add_tail(&s->sec_entry, &n->security_list);
-	mutex_unlock(&n->security_lock);
-
-	return 0;
-}
-
-/*
- * Kill'em all!
- */
-static int dst_start_node(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size)
-{
-	int err;
-
-	if (!n)
-		return -ENODEV;
-
-	if (n->trans_cache)
-		return 0;
-
-	err = n->start(n);
-	if (err)
-		return err;
-
-	printk(KERN_INFO "STARTED name: '%s', size: %llu.\n", n->name, n->size);
-	return 0;
-}
-
-typedef int (*dst_command_func)(struct dst_node *n, struct dst_ctl *ctl,
-		void *data, unsigned int size);
-
-/*
- * List of userspace commands.
- */
-static dst_command_func dst_commands[] = {
-	[DST_ADD_REMOTE] = &dst_add_remote,
-	[DST_ADD_EXPORT] = &dst_add_export,
-	[DST_DEL_NODE] = &dst_del_node,
-	[DST_CRYPTO] = &dst_crypto_init,
-	[DST_SECURITY] = &dst_security_init,
-	[DST_START] = &dst_start_node,
-};
-
-/*
- * Configuration parser.
- */
-static void cn_dst_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
-{
-	struct dst_ctl *ctl;
-	int err;
-	struct dst_ctl_ack ack;
-	struct dst_node *n = NULL, *tmp;
-	unsigned int hash;
-
-	if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
-		err = -EPERM;
-		goto out;
-	}
-
-	if (msg->len < sizeof(struct dst_ctl)) {
-		err = -EBADMSG;
-		goto out;
-	}
-
-	ctl = (struct dst_ctl *)msg->data;
-
-	if (ctl->cmd >= DST_CMD_MAX) {
-		err = -EINVAL;
-		goto out;
-	}
-	hash = dst_hash(ctl->name, sizeof(ctl->name));
-
-	mutex_lock(&dst_hash_lock);
-	list_for_each_entry(tmp, &dst_hashtable[hash], node_entry) {
-		if (!memcmp(tmp->name, ctl->name, sizeof(tmp->name))) {
-			n = tmp;
-			dst_node_get(n);
-			break;
-		}
-	}
-	mutex_unlock(&dst_hash_lock);
-
-	err = dst_commands[ctl->cmd](n, ctl, msg->data + sizeof(struct dst_ctl),
-			msg->len - sizeof(struct dst_ctl));
-
-	dst_node_put(n);
-out:
-	memcpy(&ack.msg, msg, sizeof(struct cn_msg));
-
-	ack.msg.ack = msg->ack + 1;
-	ack.msg.len = sizeof(struct dst_ctl_ack) - sizeof(struct cn_msg);
-
-	ack.error = err;
-
-	cn_netlink_send(&ack.msg, 0, GFP_KERNEL);
-}
-
-/*
- * Global initialization: sysfs, hash table, block device registration,
- * connector and various caches.
- */
-static int __init dst_sysfs_init(void)
-{
-	return bus_register(&dst_dev_bus_type);
-}
-
-static void dst_sysfs_exit(void)
-{
-	bus_unregister(&dst_dev_bus_type);
-}
-
-static int __init dst_hashtable_init(void)
-{
-	unsigned int i;
-
-	dst_hashtable = kcalloc(dst_hashtable_size, sizeof(struct list_head),
-			GFP_KERNEL);
-	if (!dst_hashtable)
-		return -ENOMEM;
-
-	for (i = 0; i < dst_hashtable_size; ++i)
-		INIT_LIST_HEAD(&dst_hashtable[i]);
-
-	return 0;
-}
-
-static void dst_hashtable_exit(void)
-{
-	unsigned int i;
-	struct dst_node *n, *tmp;
-
-	for (i = 0; i < dst_hashtable_size; ++i) {
-		list_for_each_entry_safe(n, tmp, &dst_hashtable[i], node_entry) {
-			dst_node_remove_unload(n);
-		}
-	}
-
-	kfree(dst_hashtable);
-}
-
-static int __init dst_sys_init(void)
-{
-	int err = -ENOMEM;
-
-	err = dst_hashtable_init();
-	if (err)
-		goto err_out_exit;
-
-	err = dst_export_init();
-	if (err)
-		goto err_out_hashtable_exit;
-
-	err = register_blkdev(dst_major, DST_NAME);
-	if (err < 0)
-		goto err_out_export_exit;
-	if (err)
-		dst_major = err;
-
-	err = dst_sysfs_init();
-	if (err)
-		goto err_out_unregister;
-
-	err = cn_add_callback(&cn_dst_id, "DST", cn_dst_callback);
-	if (err)
-		goto err_out_sysfs_exit;
-
-	printk(KERN_INFO "Distributed storage, '%s' release.\n", dst_name);
-
-	return 0;
-
-err_out_sysfs_exit:
-	dst_sysfs_exit();
-err_out_unregister:
-	unregister_blkdev(dst_major, DST_NAME);
-err_out_export_exit:
-	dst_export_exit();
-err_out_hashtable_exit:
-	dst_hashtable_exit();
-err_out_exit:
-	return err;
-}
-
-static void __exit dst_sys_exit(void)
-{
-	cn_del_callback(&cn_dst_id);
-	unregister_blkdev(dst_major, DST_NAME);
-	dst_hashtable_exit();
-	dst_sysfs_exit();
-	dst_export_exit();
-}
-
-module_init(dst_sys_init);
-module_exit(dst_sys_exit);
-
-MODULE_DESCRIPTION("Distributed storage");
-MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
-MODULE_LICENSE("GPL");
diff --git a/drivers/staging/dst/export.c b/drivers/staging/dst/export.c
deleted file mode 100644
index c324230e8b6..00000000000
--- a/drivers/staging/dst/export.c
+++ /dev/null
@@ -1,660 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/blkdev.h>
-#include <linux/bio.h>
-#include <linux/dst.h>
-#include <linux/in.h>
-#include <linux/in6.h>
-#include <linux/poll.h>
-#include <linux/slab.h>
-#include <linux/socket.h>
-
-#include <net/sock.h>
-
-/*
- * Export bioset is used for server block IO requests.
- */
-static struct bio_set *dst_bio_set;
-
-int __init dst_export_init(void)
-{
-	int err = -ENOMEM;
-
-	dst_bio_set = bioset_create(32, sizeof(struct dst_export_priv));
-	if (!dst_bio_set)
-		goto err_out_exit;
-
-	return 0;
-
-err_out_exit:
-	return err;
-}
-
-void dst_export_exit(void)
-{
-	bioset_free(dst_bio_set);
-}
-
-/*
- * When client connects and autonegotiates with the server node,
- * its permissions are checked in a security attributes and sent
- * back.
- */
-static unsigned int dst_check_permissions(struct dst_state *main,
-		struct dst_state *st)
-{
-	struct dst_node *n = main->node;
-	struct dst_secure *sentry;
-	struct dst_secure_user *s;
-	struct saddr *sa = &st->ctl.addr;
-	unsigned int perm = 0;
-
-	mutex_lock(&n->security_lock);
-	list_for_each_entry(sentry, &n->security_list, sec_entry) {
-		s = &sentry->sec;
-
-		if (s->addr.sa_family != sa->sa_family)
-			continue;
-
-		if (s->addr.sa_data_len != sa->sa_data_len)
-			continue;
-
-		/*
-		 * This '2' below is a port field. This may be very wrong to do
-		 * in atalk for example though. If there will be any need
-		 * to extent protocol to something else, I can create
-		 * per-family helpers and use them instead of this memcmp.
-		 */
-		if (memcmp(s->addr.sa_data + 2, sa->sa_data + 2,
-					sa->sa_data_len - 2))
-			continue;
-
-		perm = s->permissions;
-	}
-	mutex_unlock(&n->security_lock);
-
-	return perm;
-}
-
-/*
- * Accept new client: allocate appropriate network state and check permissions.
- */
-static struct dst_state *dst_accept_client(struct dst_state *st)
-{
-	unsigned int revents = 0;
-	unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP;
-	unsigned int mask = err_mask | POLLIN;
-	struct dst_node *n = st->node;
-	int err = 0;
-	struct socket *sock = NULL;
-	struct dst_state *new;
-
-	while (!err && !sock) {
-		revents = dst_state_poll(st);
-
-		if (!(revents & mask)) {
-			DEFINE_WAIT(wait);
-
-			for (;;) {
-				prepare_to_wait(&st->thread_wait,
-						&wait, TASK_INTERRUPTIBLE);
-				if (!n->trans_scan_timeout || st->need_exit)
-					break;
-
-				revents = dst_state_poll(st);
-
-				if (revents & mask)
-					break;
-
-				if (signal_pending(current))
-					break;
-
-				/*
-				 * Magic HZ? Polling check above is not safe in
-				 * all cases (like socket reset in BH context),
-				 * so it is simpler just to postpone it to the
-				 * process context instead of implementing
-				 * special locking there.
-				 */
-				schedule_timeout(HZ);
-			}
-			finish_wait(&st->thread_wait, &wait);
-		}
-
-		err = -ECONNRESET;
-		dst_state_lock(st);
-
-		dprintk("%s: st: %p, revents: %x [err: %d, in: %d].\n",
-			__func__, st, revents, revents & err_mask,
-			revents & POLLIN);
-
-		if (revents & err_mask) {
-			dprintk("%s: revents: %x, socket: %p, err: %d.\n",
-					__func__, revents, st->socket, err);
-			err = -ECONNRESET;
-		}
-
-		if (!n->trans_scan_timeout || st->need_exit)
-			err = -ENODEV;
-
-		if (st->socket && (revents & POLLIN))
-			err = kernel_accept(st->socket, &sock, 0);
-
-		dst_state_unlock(st);
-	}
-
-	if (err)
-		goto err_out_exit;
-
-	new = dst_state_alloc(st->node);
-	if (IS_ERR(new)) {
-		err = -ENOMEM;
-		goto err_out_release;
-	}
-	new->socket = sock;
-
-	new->ctl.addr.sa_data_len = sizeof(struct sockaddr);
-	err = kernel_getpeername(sock, (struct sockaddr *)&new->ctl.addr,
-			(int *)&new->ctl.addr.sa_data_len);
-	if (err)
-		goto err_out_put;
-
-	new->permissions = dst_check_permissions(st, new);
-	if (new->permissions == 0) {
-		err = -EPERM;
-		dst_dump_addr(sock, (struct sockaddr *)&new->ctl.addr,
-				"Client is not allowed to connect");
-		goto err_out_put;
-	}
-
-	err = dst_poll_init(new);
-	if (err)
-		goto err_out_put;
-
-	dst_dump_addr(sock, (struct sockaddr *)&new->ctl.addr,
-			"Connected client");
-
-	return new;
-
-err_out_put:
-	dst_state_put(new);
-err_out_release:
-	sock_release(sock);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-/*
- * Each server's block request sometime finishes.
- * Usually it happens in hard irq context of the appropriate controller,
- * so to play good with all cases we just queue BIO into the queue
- * and wake up processing thread, which gets completed request and
- * send (encrypting if needed) it back to the client (if it was a read
- * request), or sends back reply that writing successfully completed.
- */
-static int dst_export_process_request_queue(struct dst_state *st)
-{
-	unsigned long flags;
-	struct dst_export_priv *p = NULL;
-	struct bio *bio;
-	int err = 0;
-
-	while (!list_empty(&st->request_list)) {
-		spin_lock_irqsave(&st->request_lock, flags);
-		if (!list_empty(&st->request_list)) {
-			p = list_first_entry(&st->request_list,
-				struct dst_export_priv, request_entry);
-			list_del(&p->request_entry);
-		}
-		spin_unlock_irqrestore(&st->request_lock, flags);
-
-		if (!p)
-			break;
-
-		bio = p->bio;
-
-		if (dst_need_crypto(st->node) && (bio_data_dir(bio) == READ))
-			err = dst_export_crypto(st->node, bio);
-		else
-			err = dst_export_send_bio(bio);
-
-		if (err)
-			break;
-	}
-
-	return err;
-}
-
-/*
- * Cleanup export state.
- * It has to wait until all requests are finished,
- * and then free them all.
- */
-static void dst_state_cleanup_export(struct dst_state *st)
-{
-	struct dst_export_priv *p;
-	unsigned long flags;
-
-	/*
-	 * This loop waits for all pending bios to be completed and freed.
-	 */
-	while (atomic_read(&st->refcnt) > 1) {
-		dprintk("%s: st: %p, refcnt: %d, list_empty: %d.\n",
-				__func__, st, atomic_read(&st->refcnt),
-				list_empty(&st->request_list));
-		wait_event_timeout(st->thread_wait,
-				(atomic_read(&st->refcnt) == 1) ||
-				!list_empty(&st->request_list),
-				HZ/2);
-
-		while (!list_empty(&st->request_list)) {
-			p = NULL;
-			spin_lock_irqsave(&st->request_lock, flags);
-			if (!list_empty(&st->request_list)) {
-				p = list_first_entry(&st->request_list,
-					struct dst_export_priv, request_entry);
-				list_del(&p->request_entry);
-			}
-			spin_unlock_irqrestore(&st->request_lock, flags);
-
-			if (p)
-				bio_put(p->bio);
-
-			dprintk("%s: st: %p, refcnt: %d, list_empty: %d, p: "
-				"%p.\n", __func__, st, atomic_read(&st->refcnt),
-				list_empty(&st->request_list), p);
-		}
-	}
-
-	dst_state_put(st);
-}
-
-/*
- * Client accepting thread.
- * Not only accepts new connection, but also schedules receiving thread
- * and performs request completion described above.
- */
-static int dst_accept(void *init_data, void *schedule_data)
-{
-	struct dst_state *main_st = schedule_data;
-	struct dst_node *n = init_data;
-	struct dst_state *st;
-	int err;
-
-	while (n->trans_scan_timeout && !main_st->need_exit) {
-		dprintk("%s: main_st: %p, n: %p.\n", __func__, main_st, n);
-		st = dst_accept_client(main_st);
-		if (IS_ERR(st))
-			continue;
-
-		err = dst_state_schedule_receiver(st);
-		if (!err) {
-			while (n->trans_scan_timeout) {
-				err = wait_event_interruptible_timeout(st->thread_wait,
-					!list_empty(&st->request_list) ||
-					!n->trans_scan_timeout ||
-					st->need_exit,
-					HZ);
-
-				if (!n->trans_scan_timeout || st->need_exit)
-					break;
-
-				if (list_empty(&st->request_list))
-					continue;
-
-				err = dst_export_process_request_queue(st);
-				if (err)
-					break;
-			}
-
-			st->need_exit = 1;
-			wake_up(&st->thread_wait);
-		}
-
-		dst_state_cleanup_export(st);
-	}
-
-	dprintk("%s: freeing listening socket st: %p.\n", __func__, main_st);
-
-	dst_state_lock(main_st);
-	dst_poll_exit(main_st);
-	dst_state_socket_release(main_st);
-	dst_state_unlock(main_st);
-	dst_state_put(main_st);
-	dprintk("%s: freed listening socket st: %p.\n", __func__, main_st);
-
-	return 0;
-}
-
-int dst_start_export(struct dst_node *n)
-{
-	if (list_empty(&n->security_list)) {
-		printk(KERN_ERR "You are trying to export node '%s' "
-				"without security attributes.\nNo clients will "
-				"be allowed to connect. Exiting.\n", n->name);
-		return -EINVAL;
-	}
-	return dst_node_trans_init(n, sizeof(struct dst_export_priv));
-}
-
-/*
- * Initialize listening state and schedule accepting thread.
- */
-int dst_node_init_listened(struct dst_node *n, struct dst_export_ctl *le)
-{
-	struct dst_state *st;
-	int err = -ENOMEM;
-	struct dst_network_ctl *ctl = &le->ctl;
-
-	memcpy(&n->info->net, ctl, sizeof(struct dst_network_ctl));
-
-	st = dst_state_alloc(n);
-	if (IS_ERR(st)) {
-		err = PTR_ERR(st);
-		goto err_out_exit;
-	}
-	memcpy(&st->ctl, ctl, sizeof(struct dst_network_ctl));
-
-	err = dst_state_socket_create(st);
-	if (err)
-		goto err_out_put;
-
-	st->socket->sk->sk_reuse = 1;
-
-	err = kernel_bind(st->socket, (struct sockaddr *)&ctl->addr,
-			ctl->addr.sa_data_len);
-	if (err)
-		goto err_out_socket_release;
-
-	err = kernel_listen(st->socket, 1024);
-	if (err)
-		goto err_out_socket_release;
-	n->state = st;
-
-	err = dst_poll_init(st);
-	if (err)
-		goto err_out_socket_release;
-
-	dst_state_get(st);
-
-	err = thread_pool_schedule(n->pool, dst_thread_setup,
-			dst_accept, st, MAX_SCHEDULE_TIMEOUT);
-	if (err)
-		goto err_out_poll_exit;
-
-	return 0;
-
-err_out_poll_exit:
-	dst_poll_exit(st);
-err_out_socket_release:
-	dst_state_socket_release(st);
-err_out_put:
-	dst_state_put(st);
-err_out_exit:
-	n->state = NULL;
-	return err;
-}
-
-/*
- * Free bio and related private data.
- * Also drop a reference counter for appropriate state,
- * which waits when there are no more block IOs in-flight.
- */
-static void dst_bio_destructor(struct bio *bio)
-{
-	struct bio_vec *bv;
-	struct dst_export_priv *priv = bio->bi_private;
-	int i;
-
-	bio_for_each_segment(bv, bio, i) {
-		if (!bv->bv_page)
-			break;
-
-		__free_page(bv->bv_page);
-	}
-
-	if (priv)
-		dst_state_put(priv->state);
-	bio_free(bio, dst_bio_set);
-}
-
-/*
- * Block IO completion. Queue request to be sent back to
- * the client (or just confirmation).
- */
-static void dst_bio_end_io(struct bio *bio, int err)
-{
-	struct dst_export_priv *p = bio->bi_private;
-	struct dst_state *st = p->state;
-	unsigned long flags;
-
-	spin_lock_irqsave(&st->request_lock, flags);
-	list_add_tail(&p->request_entry, &st->request_list);
-	spin_unlock_irqrestore(&st->request_lock, flags);
-
-	wake_up(&st->thread_wait);
-}
-
-/*
- * Allocate read request for the server.
- */
-static int dst_export_read_request(struct bio *bio, unsigned int total_size)
-{
-	unsigned int size;
-	struct page *page;
-	int err;
-
-	while (total_size) {
-		err = -ENOMEM;
-		page = alloc_page(GFP_KERNEL);
-		if (!page)
-			goto err_out_exit;
-
-		size = min_t(unsigned int, PAGE_SIZE, total_size);
-
-		err = bio_add_page(bio, page, size, 0);
-		dprintk("%s: bio: %llu/%u, size: %u, err: %d.\n",
-				__func__, (u64)bio->bi_sector, bio->bi_size,
-				size, err);
-		if (err <= 0)
-			goto err_out_free_page;
-
-		total_size -= size;
-	}
-
-	return 0;
-
-err_out_free_page:
-	__free_page(page);
-err_out_exit:
-	return err;
-}
-
-/*
- * Allocate write request for the server.
- * Should not only get pages, but also read data from the network.
- */
-static int dst_export_write_request(struct dst_state *st,
-		struct bio *bio, unsigned int total_size)
-{
-	unsigned int size;
-	struct page *page;
-	void *data;
-	int err;
-
-	while (total_size) {
-		err = -ENOMEM;
-		page = alloc_page(GFP_KERNEL);
-		if (!page)
-			goto err_out_exit;
-
-		data = kmap(page);
-		if (!data)
-			goto err_out_free_page;
-
-		size = min_t(unsigned int, PAGE_SIZE, total_size);
-
-		err = dst_data_recv(st, data, size);
-		if (err)
-			goto err_out_unmap_page;
-
-		err = bio_add_page(bio, page, size, 0);
-		if (err <= 0)
-			goto err_out_unmap_page;
-
-		kunmap(page);
-
-		total_size -= size;
-	}
-
-	return 0;
-
-err_out_unmap_page:
-	kunmap(page);
-err_out_free_page:
-	__free_page(page);
-err_out_exit:
-	return err;
-}
-
-/*
- * Groovy, we've gotten an IO request from the client.
- * Allocate BIO from the bioset, private data from the mempool
- * and lots of pages for IO.
- */
-int dst_process_io(struct dst_state *st)
-{
-	struct dst_node *n = st->node;
-	struct dst_cmd *cmd = st->data;
-	struct bio *bio;
-	struct dst_export_priv *priv;
-	int err = -ENOMEM;
-
-	if (unlikely(!n->bdev)) {
-		err = -EINVAL;
-		goto err_out_exit;
-	}
-
-	bio = bio_alloc_bioset(GFP_KERNEL,
-			PAGE_ALIGN(cmd->size) >> PAGE_SHIFT,
-			dst_bio_set);
-	if (!bio)
-		goto err_out_exit;
-
-	priv = (struct dst_export_priv *)(((void *)bio) -
-			sizeof (struct dst_export_priv));
-
-	priv->state = dst_state_get(st);
-	priv->bio = bio;
-
-	bio->bi_private = priv;
-	bio->bi_end_io = dst_bio_end_io;
-	bio->bi_destructor = dst_bio_destructor;
-	bio->bi_bdev = n->bdev;
-
-	/*
-	 * Server side is only interested in two low bits:
-	 * uptodate (set by itself actually) and rw block
-	 */
-	bio->bi_flags |= cmd->flags & 3;
-
-	bio->bi_rw = cmd->rw;
-	bio->bi_size = 0;
-	bio->bi_sector = cmd->sector;
-
-	dst_bio_to_cmd(bio, &priv->cmd, DST_IO_RESPONSE, cmd->id);
-
-	priv->cmd.flags = 0;
-	priv->cmd.size = cmd->size;
-
-	if (bio_data_dir(bio) == WRITE) {
-		err = dst_recv_cdata(st, priv->cmd.hash);
-		if (err)
-			goto err_out_free;
-
-		err = dst_export_write_request(st, bio, cmd->size);
-		if (err)
-			goto err_out_free;
-
-		if (dst_need_crypto(n))
-			return dst_export_crypto(n, bio);
-	} else {
-		err = dst_export_read_request(bio, cmd->size);
-		if (err)
-			goto err_out_free;
-	}
-
-	dprintk("%s: bio: %llu/%u, rw: %lu, dir: %lu, flags: %lx, phys: %d.\n",
-			__func__, (u64)bio->bi_sector, bio->bi_size,
-			bio->bi_rw, bio_data_dir(bio),
-			bio->bi_flags, bio->bi_phys_segments);
-
-	generic_make_request(bio);
-
-	return 0;
-
-err_out_free:
-	bio_put(bio);
-err_out_exit:
-	return err;
-}
-
-/*
- * Ok, block IO is ready, let's send it back to the client...
- */
-int dst_export_send_bio(struct bio *bio)
-{
-	struct dst_export_priv *p = bio->bi_private;
-	struct dst_state *st = p->state;
-	struct dst_cmd *cmd = &p->cmd;
-	int err;
-
-	dprintk("%s: id: %llu, bio: %llu/%u, csize: %u, flags: %lu, rw: %lu.\n",
-			__func__, cmd->id, (u64)bio->bi_sector, bio->bi_size,
-			cmd->csize, bio->bi_flags, bio->bi_rw);
-
-	dst_convert_cmd(cmd);
-
-	dst_state_lock(st);
-	if (!st->socket) {
-		err = -ECONNRESET;
-		goto err_out_unlock;
-	}
-
-	if (bio_data_dir(bio) == WRITE) {
-		/* ... or just confirmation that writing has completed. */
-		cmd->size = cmd->csize = 0;
-		err = dst_data_send_header(st->socket, cmd,
-				sizeof(struct dst_cmd), 0);
-		if (err)
-			goto err_out_unlock;
-	} else {
-		err = dst_send_bio(st, cmd, bio);
-		if (err)
-			goto err_out_unlock;
-	}
-
-	dst_state_unlock(st);
-
-	bio_put(bio);
-	return 0;
-
-err_out_unlock:
-	dst_state_unlock(st);
-
-	bio_put(bio);
-	return err;
-}
diff --git a/drivers/staging/dst/state.c b/drivers/staging/dst/state.c
deleted file mode 100644
index 02a05e6c48c..00000000000
--- a/drivers/staging/dst/state.c
+++ /dev/null
@@ -1,844 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/buffer_head.h>
-#include <linux/blkdev.h>
-#include <linux/bio.h>
-#include <linux/connector.h>
-#include <linux/dst.h>
-#include <linux/device.h>
-#include <linux/in.h>
-#include <linux/in6.h>
-#include <linux/socket.h>
-#include <linux/slab.h>
-
-#include <net/sock.h>
-
-/*
- * Polling machinery.
- */
-
-struct dst_poll_helper {
-	poll_table		pt;
-	struct dst_state	*st;
-};
-
-static int dst_queue_wake(wait_queue_t *wait, unsigned mode,
-		int sync, void *key)
-{
-	struct dst_state *st = container_of(wait, struct dst_state, wait);
-
-	wake_up(&st->thread_wait);
-	return 1;
-}
-
-static void dst_queue_func(struct file *file, wait_queue_head_t *whead,
-				 poll_table *pt)
-{
-	struct dst_state *st = container_of(pt, struct dst_poll_helper, pt)->st;
-
-	st->whead = whead;
-	init_waitqueue_func_entry(&st->wait, dst_queue_wake);
-	add_wait_queue(whead, &st->wait);
-}
-
-void dst_poll_exit(struct dst_state *st)
-{
-	if (st->whead) {
-		remove_wait_queue(st->whead, &st->wait);
-		st->whead = NULL;
-	}
-}
-
-int dst_poll_init(struct dst_state *st)
-{
-	struct dst_poll_helper ph;
-
-	ph.st = st;
-	init_poll_funcptr(&ph.pt, &dst_queue_func);
-
-	st->socket->ops->poll(NULL, st->socket, &ph.pt);
-	return 0;
-}
-
-/*
- * Header receiving function - may block.
- */
-static int dst_data_recv_header(struct socket *sock,
-		void *data, unsigned int size, int block)
-{
-	struct msghdr msg;
-	struct kvec iov;
-	int err;
-
-	iov.iov_base = data;
-	iov.iov_len = size;
-
-	msg.msg_iov = (struct iovec *)&iov;
-	msg.msg_iovlen = 1;
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_flags = (block) ? MSG_WAITALL : MSG_DONTWAIT;
-
-	err = kernel_recvmsg(sock, &msg, &iov, 1, iov.iov_len,
-			msg.msg_flags);
-	if (err != size)
-		return -1;
-
-	return 0;
-}
-
-/*
- * Header sending function - may block.
- */
-int dst_data_send_header(struct socket *sock,
-		void *data, unsigned int size, int more)
-{
-	struct msghdr msg;
-	struct kvec iov;
-	int err;
-
-	iov.iov_base = data;
-	iov.iov_len = size;
-
-	msg.msg_iov = (struct iovec *)&iov;
-	msg.msg_iovlen = 1;
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_flags = MSG_WAITALL | (more ? MSG_MORE : 0);
-
-	err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
-	if (err != size) {
-		dprintk("%s: size: %u, more: %d, err: %d.\n",
-				__func__, size, more, err);
-		return -1;
-	}
-
-	return 0;
-}
-
-/*
- * Block autoconfiguration: request size of the storage and permissions.
- */
-static int dst_request_remote_config(struct dst_state *st)
-{
-	struct dst_node *n = st->node;
-	int err = -EINVAL;
-	struct dst_cmd *cmd = st->data;
-
-	memset(cmd, 0, sizeof(struct dst_cmd));
-	cmd->cmd = DST_CFG;
-
-	dst_convert_cmd(cmd);
-
-	err = dst_data_send_header(st->socket, cmd, sizeof(struct dst_cmd), 0);
-	if (err)
-		goto out;
-
-	err = dst_data_recv_header(st->socket, cmd, sizeof(struct dst_cmd), 1);
-	if (err)
-		goto out;
-
-	dst_convert_cmd(cmd);
-
-	if (cmd->cmd != DST_CFG) {
-		err = -EINVAL;
-		dprintk("%s: checking result: cmd: %d, size reported: %llu.\n",
-			__func__, cmd->cmd, cmd->sector);
-		goto out;
-	}
-
-	if (n->size != 0)
-		n->size = min_t(loff_t, n->size, cmd->sector);
-	else
-		n->size = cmd->sector;
-
-	n->info->size = n->size;
-	st->permissions = cmd->rw;
-
-out:
-	dprintk("%s: n: %p, err: %d, size: %llu, permission: %x.\n",
-			__func__, n, err, n->size, st->permissions);
-	return err;
-}
-
-/*
- * Socket machinery.
- */
-
-#define DST_DEFAULT_TIMEO	20000
-
-int dst_state_socket_create(struct dst_state *st)
-{
-	int err;
-	struct socket *sock;
-	struct dst_network_ctl *ctl = &st->ctl;
-
-	err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &sock);
-	if (err < 0)
-		return err;
-
-	sock->sk->sk_sndtimeo = sock->sk->sk_rcvtimeo =
-		msecs_to_jiffies(DST_DEFAULT_TIMEO);
-	sock->sk->sk_allocation = GFP_NOIO;
-
-	st->socket = st->read_socket = sock;
-	return 0;
-}
-
-void dst_state_socket_release(struct dst_state *st)
-{
-	dprintk("%s: st: %p, socket: %p, n: %p.\n",
-			__func__, st, st->socket, st->node);
-	if (st->socket) {
-		sock_release(st->socket);
-		st->socket = NULL;
-		st->read_socket = NULL;
-	}
-}
-
-void dst_dump_addr(struct socket *sk, struct sockaddr *sa, char *str)
-{
-	if (sk->ops->family == AF_INET) {
-		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
-		printk(KERN_INFO "%s %u.%u.%u.%u:%d.\n", str,
-			NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port));
-	} else if (sk->ops->family == AF_INET6) {
-		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;
-		printk(KERN_INFO "%s %pi6:%d",
-			str, &sin->sin6_addr, ntohs(sin->sin6_port));
-	}
-}
-
-void dst_state_exit_connected(struct dst_state *st)
-{
-	if (st->socket) {
-		dst_poll_exit(st);
-		st->socket->ops->shutdown(st->socket, 2);
-
-		dst_dump_addr(st->socket, (struct sockaddr *)&st->ctl.addr,
-				"Disconnected peer");
-		dst_state_socket_release(st);
-	}
-}
-
-static int dst_state_init_connected(struct dst_state *st)
-{
-	int err;
-	struct dst_network_ctl *ctl = &st->ctl;
-
-	err = dst_state_socket_create(st);
-	if (err)
-		goto err_out_exit;
-
-	err = kernel_connect(st->socket, (struct sockaddr *)&st->ctl.addr,
-			st->ctl.addr.sa_data_len, 0);
-	if (err)
-		goto err_out_release;
-
-	err = dst_poll_init(st);
-	if (err)
-		goto err_out_release;
-
-	dst_dump_addr(st->socket, (struct sockaddr *)&ctl->addr,
-			"Connected to peer");
-
-	return 0;
-
-err_out_release:
-	dst_state_socket_release(st);
-err_out_exit:
-	return err;
-}
-
-/*
- * State reset is used to reconnect to the remote peer.
- * May fail, but who cares, we will try again later.
- */
-static inline void dst_state_reset_nolock(struct dst_state *st)
-{
-	dst_state_exit_connected(st);
-	dst_state_init_connected(st);
-}
-
-static inline void dst_state_reset(struct dst_state *st)
-{
-	dst_state_lock(st);
-	dst_state_reset_nolock(st);
-	dst_state_unlock(st);
-}
-
-/*
- * Basic network sending/receiving functions.
- * Blocked mode is used.
- */
-static int dst_data_recv_raw(struct dst_state *st, void *buf, u64 size)
-{
-	struct msghdr msg;
-	struct kvec iov;
-	int err;
-
-	BUG_ON(!size);
-
-	iov.iov_base = buf;
-	iov.iov_len = size;
-
-	msg.msg_iov = (struct iovec *)&iov;
-	msg.msg_iovlen = 1;
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_flags = MSG_DONTWAIT;
-
-	err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len,
-			msg.msg_flags);
-	if (err <= 0) {
-		dprintk("%s: failed to recv data: size: %llu, err: %d.\n",
-				__func__, size, err);
-		if (err == 0)
-			err = -ECONNRESET;
-
-		dst_state_exit_connected(st);
-	}
-
-	return err;
-}
-
-/*
- * Ping command to early detect failed nodes.
- */
-static int dst_send_ping(struct dst_state *st)
-{
-	struct dst_cmd *cmd = st->data;
-	int err = -ECONNRESET;
-
-	dst_state_lock(st);
-	if (st->socket) {
-		memset(cmd, 0, sizeof(struct dst_cmd));
-
-		cmd->cmd = __cpu_to_be32(DST_PING);
-
-		err = dst_data_send_header(st->socket, cmd,
-				sizeof(struct dst_cmd), 0);
-	}
-	dprintk("%s: st: %p, socket: %p, err: %d.\n", __func__,
-			st, st->socket, err);
-	dst_state_unlock(st);
-
-	return err;
-}
-
-/*
- * Receiving function, which should either return error or read
- * whole block request. If there was no traffic for a one second,
- * send a ping, since remote node may die.
- */
-int dst_data_recv(struct dst_state *st, void *data, unsigned int size)
-{
-	unsigned int revents = 0;
-	unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP;
-	unsigned int mask = err_mask | POLLIN;
-	struct dst_node *n = st->node;
-	int err = 0;
-
-	while (size && !err) {
-		revents = dst_state_poll(st);
-
-		if (!(revents & mask)) {
-			DEFINE_WAIT(wait);
-
-			for (;;) {
-				prepare_to_wait(&st->thread_wait, &wait,
-						TASK_INTERRUPTIBLE);
-				if (!n->trans_scan_timeout || st->need_exit)
-					break;
-
-				revents = dst_state_poll(st);
-
-				if (revents & mask)
-					break;
-
-				if (signal_pending(current))
-					break;
-
-				if (!schedule_timeout(HZ)) {
-					err = dst_send_ping(st);
-					if (err)
-						return err;
-				}
-
-				continue;
-			}
-			finish_wait(&st->thread_wait, &wait);
-		}
-
-		err = -ECONNRESET;
-		dst_state_lock(st);
-
-		if (st->socket && (st->read_socket == st->socket) &&
-				(revents & POLLIN)) {
-			err = dst_data_recv_raw(st, data, size);
-			if (err > 0) {
-				data += err;
-				size -= err;
-				err = 0;
-			}
-		}
-
-		if (revents & err_mask || !st->socket) {
-			dprintk("%s: revents: %x, socket: %p, size: %u, "
-					"err: %d.\n", __func__, revents,
-					st->socket, size, err);
-			err = -ECONNRESET;
-		}
-
-		dst_state_unlock(st);
-
-		if (!n->trans_scan_timeout)
-			err = -ENODEV;
-	}
-
-	return err;
-}
-
-/*
- * Send block autoconf reply.
- */
-static int dst_process_cfg(struct dst_state *st)
-{
-	struct dst_node *n = st->node;
-	struct dst_cmd *cmd = st->data;
-	int err;
-
-	cmd->sector = n->size;
-	cmd->rw = st->permissions;
-
-	dst_convert_cmd(cmd);
-
-	dst_state_lock(st);
-	err = dst_data_send_header(st->socket, cmd, sizeof(struct dst_cmd), 0);
-	dst_state_unlock(st);
-
-	return err;
-}
-
-/*
- * Receive block IO from the network.
- */
-static int dst_recv_bio(struct dst_state *st, struct bio *bio,
-		unsigned int total_size)
-{
-	struct bio_vec *bv;
-	int i, err;
-	void *data;
-	unsigned int sz;
-
-	bio_for_each_segment(bv, bio, i) {
-		sz = min(total_size, bv->bv_len);
-
-		dprintk("%s: bio: %llu/%u, total: %u, len: %u, sz: %u, "
-				"off: %u.\n", __func__, (u64)bio->bi_sector,
-				bio->bi_size, total_size, bv->bv_len, sz,
-				bv->bv_offset);
-
-		data = kmap(bv->bv_page) + bv->bv_offset;
-		err = dst_data_recv(st, data, sz);
-		kunmap(bv->bv_page);
-
-		bv->bv_len = sz;
-
-		if (err)
-			return err;
-
-		total_size -= sz;
-		if (total_size == 0)
-			break;
-	}
-
-	return 0;
-}
-
-/*
- * Our block IO has just completed and arrived: get it.
- */
-static int dst_process_io_response(struct dst_state *st)
-{
-	struct dst_node *n = st->node;
-	struct dst_cmd *cmd = st->data;
-	struct dst_trans *t;
-	int err = 0;
-	struct bio *bio;
-
-	mutex_lock(&n->trans_lock);
-	t = dst_trans_search(n, cmd->id);
-	mutex_unlock(&n->trans_lock);
-
-	if (!t)
-		goto err_out_exit;
-
-	bio = t->bio;
-
-	dprintk("%s: bio: %llu/%u, cmd_size: %u, csize: %u, dir: %lu.\n",
-		__func__, (u64)bio->bi_sector, bio->bi_size, cmd->size,
-		cmd->csize, bio_data_dir(bio));
-
-	if (bio_data_dir(bio) == READ) {
-		if (bio->bi_size != cmd->size - cmd->csize)
-			goto err_out_exit;
-
-		if (dst_need_crypto(n)) {
-			err = dst_recv_cdata(st, t->cmd.hash);
-			if (err)
-				goto err_out_exit;
-		}
-
-		err = dst_recv_bio(st, t->bio, bio->bi_size);
-		if (err)
-			goto err_out_exit;
-
-		if (dst_need_crypto(n))
-			return dst_trans_crypto(t);
-	} else {
-		err = -EBADMSG;
-		if (cmd->size || cmd->csize)
-			goto err_out_exit;
-	}
-
-	dst_trans_remove(t);
-	dst_trans_put(t);
-
-	return 0;
-
-err_out_exit:
-	return err;
-}
-
-/*
- * Receive crypto data.
- */
-int dst_recv_cdata(struct dst_state *st, void *cdata)
-{
-	struct dst_cmd *cmd = st->data;
-	struct dst_node *n = st->node;
-	struct dst_crypto_ctl *c = &n->crypto;
-	int err;
-
-	if (cmd->csize != c->crypto_attached_size) {
-		dprintk("%s: cmd: cmd: %u, sector: %llu, size: %u, "
-				"csize: %u != digest size %u.\n",
-				__func__, cmd->cmd, cmd->sector, cmd->size,
-				cmd->csize, c->crypto_attached_size);
-		err = -EINVAL;
-		goto err_out_exit;
-	}
-
-	err = dst_data_recv(st, cdata, cmd->csize);
-	if (err)
-		goto err_out_exit;
-
-	cmd->size -= cmd->csize;
-	return 0;
-
-err_out_exit:
-	return err;
-}
-
-/*
- * Receive the command and start its processing.
- */
-static int dst_recv_processing(struct dst_state *st)
-{
-	int err = -EINTR;
-	struct dst_cmd *cmd = st->data;
-
-	/*
-	 * If socket will be reset after this statement, then
-	 * dst_data_recv() will just fail and loop will
-	 * start again, so it can be done without any locks.
-	 *
-	 * st->read_socket is needed to prevents state machine
-	 * breaking between this data reading and subsequent one
-	 * in protocol specific functions during connection reset.
-	 * In case of reset we have to read next command and do
-	 * not expect data for old command to magically appear in
-	 * new connection.
-	 */
-	st->read_socket = st->socket;
-	err = dst_data_recv(st, cmd, sizeof(struct dst_cmd));
-	if (err)
-		goto out_exit;
-
-	dst_convert_cmd(cmd);
-
-	dprintk("%s: cmd: %u, size: %u, csize: %u, id: %llu, "
-			"sector: %llu, flags: %llx, rw: %llx.\n",
-			__func__, cmd->cmd, cmd->size,
-			cmd->csize, cmd->id, cmd->sector,
-			cmd->flags, cmd->rw);
-
-	/*
-	 * This should catch protocol breakage and random garbage
-	 * instead of commands.
-	 */
-	if (unlikely(cmd->csize > st->size - sizeof(struct dst_cmd))) {
-		err = -EBADMSG;
-		goto out_exit;
-	}
-
-	err = -EPROTO;
-	switch (cmd->cmd) {
-	case DST_IO_RESPONSE:
-		err = dst_process_io_response(st);
-		break;
-	case DST_IO:
-		err = dst_process_io(st);
-		break;
-	case DST_CFG:
-		err = dst_process_cfg(st);
-		break;
-	case DST_PING:
-		err = 0;
-		break;
-	default:
-		break;
-	}
-
-out_exit:
-	return err;
-}
-
-/*
- * Receiving thread. For the client node we should try to reconnect,
- * for accepted client we just drop the state and expect it to reconnect.
- */
-static int dst_recv(void *init_data, void *schedule_data)
-{
-	struct dst_state *st = schedule_data;
-	struct dst_node *n = init_data;
-	int err = 0;
-
-	dprintk("%s: start st: %p, n: %p, scan: %lu, need_exit: %d.\n",
-			__func__, st, n, n->trans_scan_timeout, st->need_exit);
-
-	while (n->trans_scan_timeout && !st->need_exit) {
-		err = dst_recv_processing(st);
-		if (err < 0) {
-			if (!st->ctl.type)
-				break;
-
-			if (!n->trans_scan_timeout || st->need_exit)
-				break;
-
-			dst_state_reset(st);
-			msleep(1000);
-		}
-	}
-
-	st->need_exit = 1;
-	wake_up(&st->thread_wait);
-
-	dprintk("%s: freeing receiving socket st: %p.\n", __func__, st);
-	dst_state_lock(st);
-	dst_state_exit_connected(st);
-	dst_state_unlock(st);
-	dst_state_put(st);
-
-	dprintk("%s: freed receiving socket st: %p.\n", __func__, st);
-
-	return err;
-}
-
-/*
- * Network state dies here and borns couple of lines below.
- * This object is the main network state processing engine:
- * sending, receiving, reconnections, all network related
- * tasks are handled on behalf of the state.
- */
-static void dst_state_free(struct dst_state *st)
-{
-	dprintk("%s: st: %p.\n", __func__, st);
-	if (st->cleanup)
-		st->cleanup(st);
-	kfree(st->data);
-	kfree(st);
-}
-
-struct dst_state *dst_state_alloc(struct dst_node *n)
-{
-	struct dst_state *st;
-	int err = -ENOMEM;
-
-	st = kzalloc(sizeof(struct dst_state), GFP_KERNEL);
-	if (!st)
-		goto err_out_exit;
-
-	st->node = n;
-	st->need_exit = 0;
-
-	st->size = PAGE_SIZE;
-	st->data = kmalloc(st->size, GFP_KERNEL);
-	if (!st->data)
-		goto err_out_free;
-
-	spin_lock_init(&st->request_lock);
-	INIT_LIST_HEAD(&st->request_list);
-
-	mutex_init(&st->state_lock);
-	init_waitqueue_head(&st->thread_wait);
-
-	/*
-	 * One for processing thread, another one for node itself.
-	 */
-	atomic_set(&st->refcnt, 2);
-
-	dprintk("%s: st: %p, n: %p.\n", __func__, st, st->node);
-
-	return st;
-
-err_out_free:
-	kfree(st);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-int dst_state_schedule_receiver(struct dst_state *st)
-{
-	return thread_pool_schedule_private(st->node->pool, dst_thread_setup,
-			dst_recv, st, MAX_SCHEDULE_TIMEOUT, st->node);
-}
-
-/*
- * Initialize client's connection to the remote peer: allocate state,
- * connect and perform block IO autoconfiguration.
- */
-int dst_node_init_connected(struct dst_node *n, struct dst_network_ctl *r)
-{
-	struct dst_state *st;
-	int err = -ENOMEM;
-
-	st = dst_state_alloc(n);
-	if (IS_ERR(st)) {
-		err = PTR_ERR(st);
-		goto err_out_exit;
-	}
-	memcpy(&st->ctl, r, sizeof(struct dst_network_ctl));
-
-	err = dst_state_init_connected(st);
-	if (err)
-		goto err_out_free_data;
-
-	err = dst_request_remote_config(st);
-	if (err)
-		goto err_out_exit_connected;
-	n->state = st;
-
-	err = dst_state_schedule_receiver(st);
-	if (err)
-		goto err_out_exit_connected;
-
-	return 0;
-
-err_out_exit_connected:
-	dst_state_exit_connected(st);
-err_out_free_data:
-	dst_state_free(st);
-err_out_exit:
-	n->state = NULL;
-	return err;
-}
-
-void dst_state_put(struct dst_state *st)
-{
-	dprintk("%s: st: %p, refcnt: %d.\n",
-			__func__, st, atomic_read(&st->refcnt));
-	if (atomic_dec_and_test(&st->refcnt))
-		dst_state_free(st);
-}
-
-/*
- * Send block IO to the network one by one using zero-copy ->sendpage().
- */
-int dst_send_bio(struct dst_state *st, struct dst_cmd *cmd, struct bio *bio)
-{
-	struct bio_vec *bv;
-	struct dst_crypto_ctl *c = &st->node->crypto;
-	int err, i = 0;
-	int flags = MSG_WAITALL;
-
-	err = dst_data_send_header(st->socket, cmd,
-		sizeof(struct dst_cmd) + c->crypto_attached_size, bio->bi_vcnt);
-	if (err)
-		goto err_out_exit;
-
-	bio_for_each_segment(bv, bio, i) {
-		if (i < bio->bi_vcnt - 1)
-			flags |= MSG_MORE;
-
-		err = kernel_sendpage(st->socket, bv->bv_page, bv->bv_offset,
-				bv->bv_len, flags);
-		if (err <= 0)
-			goto err_out_exit;
-	}
-
-	return 0;
-
-err_out_exit:
-	dprintk("%s: %d/%d, flags: %x, err: %d.\n",
-			__func__, i, bio->bi_vcnt, flags, err);
-	return err;
-}
-
-/*
- * Send transaction to the remote peer.
- */
-int dst_trans_send(struct dst_trans *t)
-{
-	int err;
-	struct dst_state *st = t->n->state;
-	struct bio *bio = t->bio;
-
-	dst_convert_cmd(&t->cmd);
-
-	dst_state_lock(st);
-	if (!st->socket) {
-		err = dst_state_init_connected(st);
-		if (err)
-			goto err_out_unlock;
-	}
-
-	if (bio_data_dir(bio) == WRITE) {
-		err = dst_send_bio(st, &t->cmd, t->bio);
-	} else {
-		err = dst_data_send_header(st->socket, &t->cmd,
-				sizeof(struct dst_cmd), 0);
-	}
-	if (err)
-		goto err_out_reset;
-
-	dst_state_unlock(st);
-	return 0;
-
-err_out_reset:
-	dst_state_reset_nolock(st);
-err_out_unlock:
-	dst_state_unlock(st);
-
-	return err;
-}
diff --git a/drivers/staging/dst/thread_pool.c b/drivers/staging/dst/thread_pool.c
deleted file mode 100644
index 29a82b2602f..00000000000
--- a/drivers/staging/dst/thread_pool.c
+++ /dev/null
@@ -1,348 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/dst.h>
-#include <linux/kthread.h>
-#include <linux/slab.h>
-
-/*
- * Thread pool abstraction allows to schedule a work to be performed
- * on behalf of kernel thread. One does not operate with threads itself,
- * instead user provides setup and cleanup callbacks for thread pool itself,
- * and action and cleanup callbacks for each submitted work.
- *
- * Each worker has private data initialized at creation time and data,
- * provided by user at scheduling time.
- *
- * When action is being performed, thread can not be used by other users,
- * instead they will sleep until there is free thread to pick their work.
- */
-struct thread_pool_worker {
-	struct list_head	worker_entry;
-
-	struct task_struct	*thread;
-
-	struct thread_pool	*pool;
-
-	int			error;
-	int			has_data;
-	int			need_exit;
-	unsigned int		id;
-
-	wait_queue_head_t	wait;
-
-	void			*private;
-	void			*schedule_data;
-
-	int			(*action)(void *private, void *schedule_data);
-	void			(*cleanup)(void *private);
-};
-
-static void thread_pool_exit_worker(struct thread_pool_worker *w)
-{
-	kthread_stop(w->thread);
-
-	w->cleanup(w->private);
-	kfree(w);
-}
-
-/*
- * Called to mark thread as ready and allow users to schedule new work.
- */
-static void thread_pool_worker_make_ready(struct thread_pool_worker *w)
-{
-	struct thread_pool *p = w->pool;
-
-	mutex_lock(&p->thread_lock);
-
-	if (!w->need_exit) {
-		list_move_tail(&w->worker_entry, &p->ready_list);
-		w->has_data = 0;
-		mutex_unlock(&p->thread_lock);
-
-		wake_up(&p->wait);
-	} else {
-		p->thread_num--;
-		list_del(&w->worker_entry);
-		mutex_unlock(&p->thread_lock);
-
-		thread_pool_exit_worker(w);
-	}
-}
-
-/*
- * Thread action loop: waits until there is new work.
- */
-static int thread_pool_worker_func(void *data)
-{
-	struct thread_pool_worker *w = data;
-
-	while (!kthread_should_stop()) {
-		wait_event_interruptible(w->wait,
-			kthread_should_stop() || w->has_data);
-
-		if (kthread_should_stop())
-			break;
-
-		if (!w->has_data)
-			continue;
-
-		w->action(w->private, w->schedule_data);
-		thread_pool_worker_make_ready(w);
-	}
-
-	return 0;
-}
-
-/*
- * Remove single worker without specifying which one.
- */
-void thread_pool_del_worker(struct thread_pool *p)
-{
-	struct thread_pool_worker *w = NULL;
-
-	while (!w && p->thread_num) {
-		wait_event(p->wait, !list_empty(&p->ready_list) ||
-				!p->thread_num);
-
-		dprintk("%s: locking list_empty: %d, thread_num: %d.\n",
-				__func__, list_empty(&p->ready_list),
-				p->thread_num);
-
-		mutex_lock(&p->thread_lock);
-		if (!list_empty(&p->ready_list)) {
-			w = list_first_entry(&p->ready_list,
-					struct thread_pool_worker,
-					worker_entry);
-
-			dprintk("%s: deleting w: %p, thread_num: %d, "
-					"list: %p [%p.%p].\n", __func__,
-					w, p->thread_num, &p->ready_list,
-					p->ready_list.prev, p->ready_list.next);
-
-			p->thread_num--;
-			list_del(&w->worker_entry);
-		}
-		mutex_unlock(&p->thread_lock);
-	}
-
-	if (w)
-		thread_pool_exit_worker(w);
-	dprintk("%s: deleted w: %p, thread_num: %d.\n",
-			__func__, w, p->thread_num);
-}
-
-/*
- * Remove a worker with given ID.
- */
-void thread_pool_del_worker_id(struct thread_pool *p, unsigned int id)
-{
-	struct thread_pool_worker *w;
-	int found = 0;
-
-	mutex_lock(&p->thread_lock);
-	list_for_each_entry(w, &p->ready_list, worker_entry) {
-		if (w->id == id) {
-			found = 1;
-			p->thread_num--;
-			list_del(&w->worker_entry);
-			break;
-		}
-	}
-
-	if (!found) {
-		list_for_each_entry(w, &p->active_list, worker_entry) {
-			if (w->id == id) {
-				w->need_exit = 1;
-				break;
-			}
-		}
-	}
-	mutex_unlock(&p->thread_lock);
-
-	if (found)
-		thread_pool_exit_worker(w);
-}
-
-/*
- * Add new worker thread with given parameters.
- * If initialization callback fails, return error.
- */
-int thread_pool_add_worker(struct thread_pool *p,
-		char *name,
-		unsigned int id,
-		void *(*init)(void *private),
-		void (*cleanup)(void *private),
-		void *private)
-{
-	struct thread_pool_worker *w;
-	int err = -ENOMEM;
-
-	w = kzalloc(sizeof(struct thread_pool_worker), GFP_KERNEL);
-	if (!w)
-		goto err_out_exit;
-
-	w->pool = p;
-	init_waitqueue_head(&w->wait);
-	w->cleanup = cleanup;
-	w->id = id;
-
-	w->thread = kthread_run(thread_pool_worker_func, w, "%s", name);
-	if (IS_ERR(w->thread)) {
-		err = PTR_ERR(w->thread);
-		goto err_out_free;
-	}
-
-	w->private = init(private);
-	if (IS_ERR(w->private)) {
-		err = PTR_ERR(w->private);
-		goto err_out_stop_thread;
-	}
-
-	mutex_lock(&p->thread_lock);
-	list_add_tail(&w->worker_entry, &p->ready_list);
-	p->thread_num++;
-	mutex_unlock(&p->thread_lock);
-
-	return 0;
-
-err_out_stop_thread:
-	kthread_stop(w->thread);
-err_out_free:
-	kfree(w);
-err_out_exit:
-	return err;
-}
-
-/*
- * Destroy the whole pool.
- */
-void thread_pool_destroy(struct thread_pool *p)
-{
-	while (p->thread_num) {
-		dprintk("%s: num: %d.\n", __func__, p->thread_num);
-		thread_pool_del_worker(p);
-	}
-
-	kfree(p);
-}
-
-/*
- * Create a pool with given number of threads.
- * They will have sequential IDs started from zero.
- */
-struct thread_pool *thread_pool_create(int num, char *name,
-		void *(*init)(void *private),
-		void (*cleanup)(void *private),
-		void *private)
-{
-	struct thread_pool_worker *w, *tmp;
-	struct thread_pool *p;
-	int err = -ENOMEM;
-	int i;
-
-	p = kzalloc(sizeof(struct thread_pool), GFP_KERNEL);
-	if (!p)
-		goto err_out_exit;
-
-	init_waitqueue_head(&p->wait);
-	mutex_init(&p->thread_lock);
-	INIT_LIST_HEAD(&p->ready_list);
-	INIT_LIST_HEAD(&p->active_list);
-	p->thread_num = 0;
-
-	for (i = 0; i < num; ++i) {
-		err = thread_pool_add_worker(p, name, i, init,
-				cleanup, private);
-		if (err)
-			goto err_out_free_all;
-	}
-
-	return p;
-
-err_out_free_all:
-	list_for_each_entry_safe(w, tmp, &p->ready_list, worker_entry) {
-		list_del(&w->worker_entry);
-		thread_pool_exit_worker(w);
-	}
-	kfree(p);
-err_out_exit:
-	return ERR_PTR(err);
-}
-
-/*
- * Schedule execution of the action on a given thread,
- * provided ID pointer has to match previously stored
- * private data.
- */
-int thread_pool_schedule_private(struct thread_pool *p,
-		int (*setup)(void *private, void *data),
-		int (*action)(void *private, void *data),
-		void *data, long timeout, void *id)
-{
-	struct thread_pool_worker *w, *tmp, *worker = NULL;
-	int err = 0;
-
-	while (!worker && !err) {
-		timeout = wait_event_interruptible_timeout(p->wait,
-				!list_empty(&p->ready_list),
-				timeout);
-
-		if (!timeout) {
-			err = -ETIMEDOUT;
-			break;
-		}
-
-		worker = NULL;
-		mutex_lock(&p->thread_lock);
-		list_for_each_entry_safe(w, tmp, &p->ready_list, worker_entry) {
-			if (id && id != w->private)
-				continue;
-
-			worker = w;
-
-			list_move_tail(&w->worker_entry, &p->active_list);
-
-			err = setup(w->private, data);
-			if (!err) {
-				w->schedule_data = data;
-				w->action = action;
-				w->has_data = 1;
-				wake_up(&w->wait);
-			} else {
-				list_move_tail(&w->worker_entry,
-						&p->ready_list);
-			}
-
-			break;
-		}
-		mutex_unlock(&p->thread_lock);
-	}
-
-	return err;
-}
-
-/*
- * Schedule execution on arbitrary thread from the pool.
- */
-int thread_pool_schedule(struct thread_pool *p,
-		int (*setup)(void *private, void *data),
-		int (*action)(void *private, void *data),
-		void *data, long timeout)
-{
-	return thread_pool_schedule_private(p, setup,
-			action, data, timeout, NULL);
-}
diff --git a/drivers/staging/dst/trans.c b/drivers/staging/dst/trans.c
deleted file mode 100644
index 1c36a6bc31d..00000000000
--- a/drivers/staging/dst/trans.c
+++ /dev/null
@@ -1,337 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bio.h>
-#include <linux/dst.h>
-#include <linux/slab.h>
-#include <linux/mempool.h>
-
-/*
- * Transaction memory pool size.
- */
-static int dst_mempool_num = 32;
-module_param(dst_mempool_num, int, 0644);
-
-/*
- * Transaction tree management.
- */
-static inline int dst_trans_cmp(dst_gen_t gen, dst_gen_t new)
-{
-	if (gen < new)
-		return 1;
-	if (gen > new)
-		return -1;
-	return 0;
-}
-
-struct dst_trans *dst_trans_search(struct dst_node *node, dst_gen_t gen)
-{
-	struct rb_root *root = &node->trans_root;
-	struct rb_node *n = root->rb_node;
-	struct dst_trans *t, *ret = NULL;
-	int cmp;
-
-	while (n) {
-		t = rb_entry(n, struct dst_trans, trans_entry);
-
-		cmp = dst_trans_cmp(t->gen, gen);
-		if (cmp < 0)
-			n = n->rb_left;
-		else if (cmp > 0)
-			n = n->rb_right;
-		else {
-			ret = t;
-			break;
-		}
-	}
-
-	dprintk("%s: %s transaction: id: %llu.\n", __func__,
-			(ret) ? "found" : "not found", gen);
-
-	return ret;
-}
-
-static int dst_trans_insert(struct dst_trans *new)
-{
-	struct rb_root *root = &new->n->trans_root;
-	struct rb_node **n = &root->rb_node, *parent = NULL;
-	struct dst_trans *ret = NULL, *t;
-	int cmp;
-
-	while (*n) {
-		parent = *n;
-
-		t = rb_entry(parent, struct dst_trans, trans_entry);
-
-		cmp = dst_trans_cmp(t->gen, new->gen);
-		if (cmp < 0)
-			n = &parent->rb_left;
-		else if (cmp > 0)
-			n = &parent->rb_right;
-		else {
-			ret = t;
-			break;
-		}
-	}
-
-	new->send_time = jiffies;
-	if (ret) {
-		printk(KERN_DEBUG "%s: exist: old: gen: %llu, bio: %llu/%u, "
-			"send_time: %lu, new: gen: %llu, bio: %llu/%u, "
-			"send_time: %lu.\n", __func__,
-			ret->gen, (u64)ret->bio->bi_sector,
-			ret->bio->bi_size, ret->send_time,
-			new->gen, (u64)new->bio->bi_sector,
-			new->bio->bi_size, new->send_time);
-		return -EEXIST;
-	}
-
-	rb_link_node(&new->trans_entry, parent, n);
-	rb_insert_color(&new->trans_entry, root);
-
-	dprintk("%s: inserted: gen: %llu, bio: %llu/%u, send_time: %lu.\n",
-		__func__, new->gen, (u64)new->bio->bi_sector,
-		new->bio->bi_size, new->send_time);
-
-	return 0;
-}
-
-int dst_trans_remove_nolock(struct dst_trans *t)
-{
-	struct dst_node *n = t->n;
-
-	if (t->trans_entry.rb_parent_color) {
-		rb_erase(&t->trans_entry, &n->trans_root);
-		t->trans_entry.rb_parent_color = 0;
-	}
-	return 0;
-}
-
-int dst_trans_remove(struct dst_trans *t)
-{
-	int ret;
-	struct dst_node *n = t->n;
-
-	mutex_lock(&n->trans_lock);
-	ret = dst_trans_remove_nolock(t);
-	mutex_unlock(&n->trans_lock);
-
-	return ret;
-}
-
-/*
- * When transaction is completed and there are no more users,
- * we complete appriate block IO request with given error status.
- */
-void dst_trans_put(struct dst_trans *t)
-{
-	if (atomic_dec_and_test(&t->refcnt)) {
-		struct bio *bio = t->bio;
-
-		dprintk("%s: completed t: %p, gen: %llu, bio: %p.\n",
-				__func__, t, t->gen, bio);
-
-		bio_endio(bio, t->error);
-		bio_put(bio);
-
-		dst_node_put(t->n);
-		mempool_free(t, t->n->trans_pool);
-	}
-}
-
-/*
- * Process given block IO request: allocate transaction, insert it into the tree
- * and send/schedule crypto processing.
- */
-int dst_process_bio(struct dst_node *n, struct bio *bio)
-{
-	struct dst_trans *t;
-	int err = -ENOMEM;
-
-	t = mempool_alloc(n->trans_pool, GFP_NOFS);
-	if (!t)
-		goto err_out_exit;
-
-	t->n = dst_node_get(n);
-	t->bio = bio;
-	t->error = 0;
-	t->retries = 0;
-	atomic_set(&t->refcnt, 1);
-	t->gen = atomic_long_inc_return(&n->gen);
-
-	t->enc = bio_data_dir(bio);
-	dst_bio_to_cmd(bio, &t->cmd, DST_IO, t->gen);
-
-	mutex_lock(&n->trans_lock);
-	err = dst_trans_insert(t);
-	mutex_unlock(&n->trans_lock);
-	if (err)
-		goto err_out_free;
-
-	dprintk("%s: gen: %llu, bio: %llu/%u, dir/enc: %d, need_crypto: %d.\n",
-			__func__, t->gen, (u64)bio->bi_sector,
-			bio->bi_size, t->enc, dst_need_crypto(n));
-
-	if (dst_need_crypto(n) && t->enc)
-		dst_trans_crypto(t);
-	else
-		dst_trans_send(t);
-
-	return 0;
-
-err_out_free:
-	dst_node_put(n);
-	mempool_free(t, n->trans_pool);
-err_out_exit:
-	bio_endio(bio, err);
-	bio_put(bio);
-	return err;
-}
-
-/*
- * Scan for timeout/stale transactions.
- * Each transaction is being resent multiple times before error completion.
- */
-static void dst_trans_scan(struct work_struct *work)
-{
-	struct dst_node *n = container_of(work, struct dst_node,
-			trans_work.work);
-	struct rb_node *rb_node;
-	struct dst_trans *t;
-	unsigned long timeout = n->trans_scan_timeout;
-	int num = 10 * n->trans_max_retries;
-
-	mutex_lock(&n->trans_lock);
-
-	for (rb_node = rb_first(&n->trans_root); rb_node; ) {
-		t = rb_entry(rb_node, struct dst_trans, trans_entry);
-
-		if (timeout && time_after(t->send_time + timeout, jiffies)
-				&& t->retries == 0)
-			break;
-#if 0
-		dprintk("%s: t: %p, gen: %llu, n: %s, retries: %u, max: %u.\n",
-			__func__, t, t->gen, n->name,
-			t->retries, n->trans_max_retries);
-#endif
-		if (--num == 0)
-			break;
-
-		dst_trans_get(t);
-
-		rb_node = rb_next(rb_node);
-
-		if (timeout && (++t->retries < n->trans_max_retries)) {
-			dst_trans_send(t);
-		} else {
-			t->error = -ETIMEDOUT;
-			dst_trans_remove_nolock(t);
-			dst_trans_put(t);
-		}
-
-		dst_trans_put(t);
-	}
-
-	mutex_unlock(&n->trans_lock);
-
-	/*
-	 * If no timeout specified then system is in the middle of exiting
-	 * process, so no need to reschedule scanning process again.
-	 */
-	if (timeout) {
-		if (!num)
-			timeout = HZ;
-		schedule_delayed_work(&n->trans_work, timeout);
-	}
-}
-
-/*
- * Flush all transactions and mark them as timed out.
- * Destroy transaction pools.
- */
-void dst_node_trans_exit(struct dst_node *n)
-{
-	struct dst_trans *t;
-	struct rb_node *rb_node;
-
-	if (!n->trans_cache)
-		return;
-
-	dprintk("%s: n: %p, cancelling the work.\n", __func__, n);
-	cancel_delayed_work_sync(&n->trans_work);
-	flush_scheduled_work();
-	dprintk("%s: n: %p, work has been cancelled.\n", __func__, n);
-
-	for (rb_node = rb_first(&n->trans_root); rb_node; ) {
-		t = rb_entry(rb_node, struct dst_trans, trans_entry);
-
-		dprintk("%s: t: %p, gen: %llu, n: %s.\n",
-			__func__, t, t->gen, n->name);
-
-		rb_node = rb_next(rb_node);
-
-		t->error = -ETIMEDOUT;
-		dst_trans_remove_nolock(t);
-		dst_trans_put(t);
-	}
-
-	mempool_destroy(n->trans_pool);
-	kmem_cache_destroy(n->trans_cache);
-}
-
-/*
- * Initialize transaction storage for given node.
- * Transaction stores not only control information,
- * but also network command and crypto data (if needed)
- * to reduce number of allocations. Thus transaction size
- * differs from node to node.
- */
-int dst_node_trans_init(struct dst_node *n, unsigned int size)
-{
-	/*
-	 * We need this, since node with given name can be dropped from the
-	 * hash table, but be still alive, so subsequent creation of the node
-	 * with the same name may collide with existing cache name.
-	 */
-
-	snprintf(n->cache_name, sizeof(n->cache_name), "%s-%p", n->name, n);
-
-	n->trans_cache = kmem_cache_create(n->cache_name,
-			size + n->crypto.crypto_attached_size,
-			0, 0, NULL);
-	if (!n->trans_cache)
-		goto err_out_exit;
-
-	n->trans_pool = mempool_create_slab_pool(dst_mempool_num,
-			n->trans_cache);
-	if (!n->trans_pool)
-		goto err_out_cache_destroy;
-
-	mutex_init(&n->trans_lock);
-	n->trans_root = RB_ROOT;
-
-	INIT_DELAYED_WORK(&n->trans_work, dst_trans_scan);
-	schedule_delayed_work(&n->trans_work, n->trans_scan_timeout);
-
-	dprintk("%s: n: %p, size: %u, crypto: %u.\n",
-		__func__, n, size, n->crypto.crypto_attached_size);
-
-	return 0;
-
-err_out_cache_destroy:
-	kmem_cache_destroy(n->trans_cache);
-err_out_exit:
-	return -ENOMEM;
-}