smb: move client and server files to common directory fs/smb

Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko
and helper modules) to new fs/smb subdirectory:

   fs/cifs --> fs/smb/client
   fs/ksmbd --> fs/smb/server
   fs/smbfs_common --> fs/smb/common

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 0 insertions, 1810 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
deleted file mode 100644
index 24bdd5f4d3bc..000000000000
--- a/fs/cifs/transport.c
+++ /dev/null
@@ -1,1810 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- *   Copyright (C) International Business Machines  Corp., 2002,2008
- *   Author(s): Steve French (sfrench@us.ibm.com)
- *   Jeremy Allison (jra@samba.org) 2006.
- *
- */
-
-#include <linux/fs.h>
-#include <linux/list.h>
-#include <linux/gfp.h>
-#include <linux/wait.h>
-#include <linux/net.h>
-#include <linux/delay.h>
-#include <linux/freezer.h>
-#include <linux/tcp.h>
-#include <linux/bvec.h>
-#include <linux/highmem.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <linux/mempool.h>
-#include <linux/sched/signal.h>
-#include <linux/task_io_accounting_ops.h>
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_debug.h"
-#include "smb2proto.h"
-#include "smbdirect.h"
-
-/* Max number of iovectors we can use off the stack when sending requests. */
-#define CIFS_MAX_IOV_SIZE 8
-
-void
-cifs_wake_up_task(struct mid_q_entry *mid)
-{
-	wake_up_process(mid->callback_data);
-}
-
-static struct mid_q_entry *
-alloc_mid(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
-{
-	struct mid_q_entry *temp;
-
-	if (server == NULL) {
-		cifs_dbg(VFS, "%s: null TCP session\n", __func__);
-		return NULL;
-	}
-
-	temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
-	memset(temp, 0, sizeof(struct mid_q_entry));
-	kref_init(&temp->refcount);
-	temp->mid = get_mid(smb_buffer);
-	temp->pid = current->pid;
-	temp->command = cpu_to_le16(smb_buffer->Command);
-	cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command);
-	/*	do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
-	/* when mid allocated can be before when sent */
-	temp->when_alloc = jiffies;
-	temp->server = server;
-
-	/*
-	 * The default is for the mid to be synchronous, so the
-	 * default callback just wakes up the current task.
-	 */
-	get_task_struct(current);
-	temp->creator = current;
-	temp->callback = cifs_wake_up_task;
-	temp->callback_data = current;
-
-	atomic_inc(&mid_count);
-	temp->mid_state = MID_REQUEST_ALLOCATED;
-	return temp;
-}
-
-static void __release_mid(struct kref *refcount)
-{
-	struct mid_q_entry *midEntry =
-			container_of(refcount, struct mid_q_entry, refcount);
-#ifdef CONFIG_CIFS_STATS2
-	__le16 command = midEntry->server->vals->lock_cmd;
-	__u16 smb_cmd = le16_to_cpu(midEntry->command);
-	unsigned long now;
-	unsigned long roundtrip_time;
-#endif
-	struct TCP_Server_Info *server = midEntry->server;
-
-	if (midEntry->resp_buf && (midEntry->mid_flags & MID_WAIT_CANCELLED) &&
-	    midEntry->mid_state == MID_RESPONSE_RECEIVED &&
-	    server->ops->handle_cancelled_mid)
-		server->ops->handle_cancelled_mid(midEntry, server);
-
-	midEntry->mid_state = MID_FREE;
-	atomic_dec(&mid_count);
-	if (midEntry->large_buf)
-		cifs_buf_release(midEntry->resp_buf);
-	else
-		cifs_small_buf_release(midEntry->resp_buf);
-#ifdef CONFIG_CIFS_STATS2
-	now = jiffies;
-	if (now < midEntry->when_alloc)
-		cifs_server_dbg(VFS, "Invalid mid allocation time\n");
-	roundtrip_time = now - midEntry->when_alloc;
-
-	if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) {
-		if (atomic_read(&server->num_cmds[smb_cmd]) == 0) {
-			server->slowest_cmd[smb_cmd] = roundtrip_time;
-			server->fastest_cmd[smb_cmd] = roundtrip_time;
-		} else {
-			if (server->slowest_cmd[smb_cmd] < roundtrip_time)
-				server->slowest_cmd[smb_cmd] = roundtrip_time;
-			else if (server->fastest_cmd[smb_cmd] > roundtrip_time)
-				server->fastest_cmd[smb_cmd] = roundtrip_time;
-		}
-		cifs_stats_inc(&server->num_cmds[smb_cmd]);
-		server->time_per_cmd[smb_cmd] += roundtrip_time;
-	}
-	/*
-	 * commands taking longer than one second (default) can be indications
-	 * that something is wrong, unless it is quite a slow link or a very
-	 * busy server. Note that this calc is unlikely or impossible to wrap
-	 * as long as slow_rsp_threshold is not set way above recommended max
-	 * value (32767 ie 9 hours) and is generally harmless even if wrong
-	 * since only affects debug counters - so leaving the calc as simple
-	 * comparison rather than doing multiple conversions and overflow
-	 * checks
-	 */
-	if ((slow_rsp_threshold != 0) &&
-	    time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) &&
-	    (midEntry->command != command)) {
-		/*
-		 * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command
-		 * NB: le16_to_cpu returns unsigned so can not be negative below
-		 */
-		if (smb_cmd < NUMBER_OF_SMB2_COMMANDS)
-			cifs_stats_inc(&server->smb2slowcmd[smb_cmd]);
-
-		trace_smb3_slow_rsp(smb_cmd, midEntry->mid, midEntry->pid,
-			       midEntry->when_sent, midEntry->when_received);
-		if (cifsFYI & CIFS_TIMER) {
-			pr_debug("slow rsp: cmd %d mid %llu",
-				 midEntry->command, midEntry->mid);
-			cifs_info("A: 0x%lx S: 0x%lx R: 0x%lx\n",
-				  now - midEntry->when_alloc,
-				  now - midEntry->when_sent,
-				  now - midEntry->when_received);
-		}
-	}
-#endif
-	put_task_struct(midEntry->creator);
-
-	mempool_free(midEntry, cifs_mid_poolp);
-}
-
-void release_mid(struct mid_q_entry *mid)
-{
-	struct TCP_Server_Info *server = mid->server;
-
-	spin_lock(&server->mid_lock);
-	kref_put(&mid->refcount, __release_mid);
-	spin_unlock(&server->mid_lock);
-}
-
-void
-delete_mid(struct mid_q_entry *mid)
-{
-	spin_lock(&mid->server->mid_lock);
-	if (!(mid->mid_flags & MID_DELETED)) {
-		list_del_init(&mid->qhead);
-		mid->mid_flags |= MID_DELETED;
-	}
-	spin_unlock(&mid->server->mid_lock);
-
-	release_mid(mid);
-}
-
-/*
- * smb_send_kvec - send an array of kvecs to the server
- * @server:	Server to send the data to
- * @smb_msg:	Message to send
- * @sent:	amount of data sent on socket is stored here
- *
- * Our basic "send data to server" function. Should be called with srv_mutex
- * held. The caller is responsible for handling the results.
- */
-static int
-smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg,
-	      size_t *sent)
-{
-	int rc = 0;
-	int retries = 0;
-	struct socket *ssocket = server->ssocket;
-
-	*sent = 0;
-
-	if (server->noblocksnd)
-		smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
-	else
-		smb_msg->msg_flags = MSG_NOSIGNAL;
-
-	while (msg_data_left(smb_msg)) {
-		/*
-		 * If blocking send, we try 3 times, since each can block
-		 * for 5 seconds. For nonblocking  we have to try more
-		 * but wait increasing amounts of time allowing time for
-		 * socket to clear.  The overall time we wait in either
-		 * case to send on the socket is about 15 seconds.
-		 * Similarly we wait for 15 seconds for a response from
-		 * the server in SendReceive[2] for the server to send
-		 * a response back for most types of requests (except
-		 * SMB Write past end of file which can be slow, and
-		 * blocking lock operations). NFS waits slightly longer
-		 * than CIFS, but this can make it take longer for
-		 * nonresponsive servers to be detected and 15 seconds
-		 * is more than enough time for modern networks to
-		 * send a packet.  In most cases if we fail to send
-		 * after the retries we will kill the socket and
-		 * reconnect which may clear the network problem.
-		 */
-		rc = sock_sendmsg(ssocket, smb_msg);
-		if (rc == -EAGAIN) {
-			retries++;
-			if (retries >= 14 ||
-			    (!server->noblocksnd && (retries > 2))) {
-				cifs_server_dbg(VFS, "sends on sock %p stuck for 15 seconds\n",
-					 ssocket);
-				return -EAGAIN;
-			}
-			msleep(1 << retries);
-			continue;
-		}
-
-		if (rc < 0)
-			return rc;
-
-		if (rc == 0) {
-			/* should never happen, letting socket clear before
-			   retrying is our only obvious option here */
-			cifs_server_dbg(VFS, "tcp sent no data\n");
-			msleep(500);
-			continue;
-		}
-
-		/* send was at least partially successful */
-		*sent += rc;
-		retries = 0; /* in case we get ENOSPC on the next send */
-	}
-	return 0;
-}
-
-unsigned long
-smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst)
-{
-	unsigned int i;
-	struct kvec *iov;
-	int nvec;
-	unsigned long buflen = 0;
-
-	if (!is_smb1(server) && rqst->rq_nvec >= 2 &&
-	    rqst->rq_iov[0].iov_len == 4) {
-		iov = &rqst->rq_iov[1];
-		nvec = rqst->rq_nvec - 1;
-	} else {
-		iov = rqst->rq_iov;
-		nvec = rqst->rq_nvec;
-	}
-
-	/* total up iov array first */
-	for (i = 0; i < nvec; i++)
-		buflen += iov[i].iov_len;
-
-	buflen += iov_iter_count(&rqst->rq_iter);
-	return buflen;
-}
-
-static int
-__smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
-		struct smb_rqst *rqst)
-{
-	int rc;
-	struct kvec *iov;
-	int n_vec;
-	unsigned int send_length = 0;
-	unsigned int i, j;
-	sigset_t mask, oldmask;
-	size_t total_len = 0, sent, size;
-	struct socket *ssocket = server->ssocket;
-	struct msghdr smb_msg = {};
-	__be32 rfc1002_marker;
-
-	cifs_in_send_inc(server);
-	if (cifs_rdma_enabled(server)) {
-		/* return -EAGAIN when connecting or reconnecting */
-		rc = -EAGAIN;
-		if (server->smbd_conn)
-			rc = smbd_send(server, num_rqst, rqst);
-		goto smbd_done;
-	}
-
-	rc = -EAGAIN;
-	if (ssocket == NULL)
-		goto out;
-
-	rc = -ERESTARTSYS;
-	if (fatal_signal_pending(current)) {
-		cifs_dbg(FYI, "signal pending before send request\n");
-		goto out;
-	}
-
-	rc = 0;
-	/* cork the socket */
-	tcp_sock_set_cork(ssocket->sk, true);
-
-	for (j = 0; j < num_rqst; j++)
-		send_length += smb_rqst_len(server, &rqst[j]);
-	rfc1002_marker = cpu_to_be32(send_length);
-
-	/*
-	 * We should not allow signals to interrupt the network send because
-	 * any partial send will cause session reconnects thus increasing
-	 * latency of system calls and overload a server with unnecessary
-	 * requests.
-	 */
-
-	sigfillset(&mask);
-	sigprocmask(SIG_BLOCK, &mask, &oldmask);
-
-	/* Generate a rfc1002 marker for SMB2+ */
-	if (!is_smb1(server)) {
-		struct kvec hiov = {
-			.iov_base = &rfc1002_marker,
-			.iov_len  = 4
-		};
-		iov_iter_kvec(&smb_msg.msg_iter, ITER_SOURCE, &hiov, 1, 4);
-		rc = smb_send_kvec(server, &smb_msg, &sent);
-		if (rc < 0)
-			goto unmask;
-
-		total_len += sent;
-		send_length += 4;
-	}
-
-	cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length);
-
-	for (j = 0; j < num_rqst; j++) {
-		iov = rqst[j].rq_iov;
-		n_vec = rqst[j].rq_nvec;
-
-		size = 0;
-		for (i = 0; i < n_vec; i++) {
-			dump_smb(iov[i].iov_base, iov[i].iov_len);
-			size += iov[i].iov_len;
-		}
-
-		iov_iter_kvec(&smb_msg.msg_iter, ITER_SOURCE, iov, n_vec, size);
-
-		rc = smb_send_kvec(server, &smb_msg, &sent);
-		if (rc < 0)
-			goto unmask;
-
-		total_len += sent;
-
-		if (iov_iter_count(&rqst[j].rq_iter) > 0) {
-			smb_msg.msg_iter = rqst[j].rq_iter;
-			rc = smb_send_kvec(server, &smb_msg, &sent);
-			if (rc < 0)
-				break;
-			total_len += sent;
-		}
-
-}
-
-unmask:
-	sigprocmask(SIG_SETMASK, &oldmask, NULL);
-
-	/*
-	 * If signal is pending but we have already sent the whole packet to
-	 * the server we need to return success status to allow a corresponding
-	 * mid entry to be kept in the pending requests queue thus allowing
-	 * to handle responses from the server by the client.
-	 *
-	 * If only part of the packet has been sent there is no need to hide
-	 * interrupt because the session will be reconnected anyway, so there
-	 * won't be any response from the server to handle.
-	 */
-
-	if (signal_pending(current) && (total_len != send_length)) {
-		cifs_dbg(FYI, "signal is pending after attempt to send\n");
-		rc = -ERESTARTSYS;
-	}
-
-	/* uncork it */
-	tcp_sock_set_cork(ssocket->sk, false);
-
-	if ((total_len > 0) && (total_len != send_length)) {
-		cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n",
-			 send_length, total_len);
-		/*
-		 * If we have only sent part of an SMB then the next SMB could
-		 * be taken as the remainder of this one. We need to kill the
-		 * socket so the server throws away the partial SMB
-		 */
-		cifs_signal_cifsd_for_reconnect(server, false);
-		trace_smb3_partial_send_reconnect(server->CurrentMid,
-						  server->conn_id, server->hostname);
-	}
-smbd_done:
-	if (rc < 0 && rc != -EINTR)
-		cifs_server_dbg(VFS, "Error %d sending data on socket to server\n",
-			 rc);
-	else if (rc > 0)
-		rc = 0;
-out:
-	cifs_in_send_dec(server);
-	return rc;
-}
-
-static int
-smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
-	      struct smb_rqst *rqst, int flags)
-{
-	struct kvec iov;
-	struct smb2_transform_hdr *tr_hdr;
-	struct smb_rqst cur_rqst[MAX_COMPOUND];
-	int rc;
-
-	if (!(flags & CIFS_TRANSFORM_REQ))
-		return __smb_send_rqst(server, num_rqst, rqst);
-
-	if (num_rqst > MAX_COMPOUND - 1)
-		return -ENOMEM;
-
-	if (!server->ops->init_transform_rq) {
-		cifs_server_dbg(VFS, "Encryption requested but transform callback is missing\n");
-		return -EIO;
-	}
-
-	tr_hdr = kzalloc(sizeof(*tr_hdr), GFP_NOFS);
-	if (!tr_hdr)
-		return -ENOMEM;
-
-	memset(&cur_rqst[0], 0, sizeof(cur_rqst));
-	memset(&iov, 0, sizeof(iov));
-
-	iov.iov_base = tr_hdr;
-	iov.iov_len = sizeof(*tr_hdr);
-	cur_rqst[0].rq_iov = &iov;
-	cur_rqst[0].rq_nvec = 1;
-
-	rc = server->ops->init_transform_rq(server, num_rqst + 1,
-					    &cur_rqst[0], rqst);
-	if (rc)
-		goto out;
-
-	rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]);
-	smb3_free_compound_rqst(num_rqst, &cur_rqst[1]);
-out:
-	kfree(tr_hdr);
-	return rc;
-}
-
-int
-smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
-	 unsigned int smb_buf_length)
-{
-	struct kvec iov[2];
-	struct smb_rqst rqst = { .rq_iov = iov,
-				 .rq_nvec = 2 };
-
-	iov[0].iov_base = smb_buffer;
-	iov[0].iov_len = 4;
-	iov[1].iov_base = (char *)smb_buffer + 4;
-	iov[1].iov_len = smb_buf_length;
-
-	return __smb_send_rqst(server, 1, &rqst);
-}
-
-static int
-wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
-		      const int timeout, const int flags,
-		      unsigned int *instance)
-{
-	long rc;
-	int *credits;
-	int optype;
-	long int t;
-	int scredits, in_flight;
-
-	if (timeout < 0)
-		t = MAX_JIFFY_OFFSET;
-	else
-		t = msecs_to_jiffies(timeout);
-
-	optype = flags & CIFS_OP_MASK;
-
-	*instance = 0;
-
-	credits = server->ops->get_credits_field(server, optype);
-	/* Since an echo is already inflight, no need to wait to send another */
-	if (*credits <= 0 && optype == CIFS_ECHO_OP)
-		return -EAGAIN;
-
-	spin_lock(&server->req_lock);
-	if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) {
-		/* oplock breaks must not be held up */
-		server->in_flight++;
-		if (server->in_flight > server->max_in_flight)
-			server->max_in_flight = server->in_flight;
-		*credits -= 1;
-		*instance = server->reconnect_instance;
-		scredits = *credits;
-		in_flight = server->in_flight;
-		spin_unlock(&server->req_lock);
-
-		trace_smb3_nblk_credits(server->CurrentMid,
-				server->conn_id, server->hostname, scredits, -1, in_flight);
-		cifs_dbg(FYI, "%s: remove %u credits total=%d\n",
-				__func__, 1, scredits);
-
-		return 0;
-	}
-
-	while (1) {
-		if (*credits < num_credits) {
-			scredits = *credits;
-			spin_unlock(&server->req_lock);
-
-			cifs_num_waiters_inc(server);
-			rc = wait_event_killable_timeout(server->request_q,
-				has_credits(server, credits, num_credits), t);
-			cifs_num_waiters_dec(server);
-			if (!rc) {
-				spin_lock(&server->req_lock);
-				scredits = *credits;
-				in_flight = server->in_flight;
-				spin_unlock(&server->req_lock);
-
-				trace_smb3_credit_timeout(server->CurrentMid,
-						server->conn_id, server->hostname, scredits,
-						num_credits, in_flight);
-				cifs_server_dbg(VFS, "wait timed out after %d ms\n",
-						timeout);
-				return -EBUSY;
-			}
-			if (rc == -ERESTARTSYS)
-				return -ERESTARTSYS;
-			spin_lock(&server->req_lock);
-		} else {
-			spin_unlock(&server->req_lock);
-
-			spin_lock(&server->srv_lock);
-			if (server->tcpStatus == CifsExiting) {
-				spin_unlock(&server->srv_lock);
-				return -ENOENT;
-			}
-			spin_unlock(&server->srv_lock);
-
-			/*
-			 * For normal commands, reserve the last MAX_COMPOUND
-			 * credits to compound requests.
-			 * Otherwise these compounds could be permanently
-			 * starved for credits by single-credit requests.
-			 *
-			 * To prevent spinning CPU, block this thread until
-			 * there are >MAX_COMPOUND credits available.
-			 * But only do this is we already have a lot of
-			 * credits in flight to avoid triggering this check
-			 * for servers that are slow to hand out credits on
-			 * new sessions.
-			 */
-			spin_lock(&server->req_lock);
-			if (!optype && num_credits == 1 &&
-			    server->in_flight > 2 * MAX_COMPOUND &&
-			    *credits <= MAX_COMPOUND) {
-				spin_unlock(&server->req_lock);
-
-				cifs_num_waiters_inc(server);
-				rc = wait_event_killable_timeout(
-					server->request_q,
-					has_credits(server, credits,
-						    MAX_COMPOUND + 1),
-					t);
-				cifs_num_waiters_dec(server);
-				if (!rc) {
-					spin_lock(&server->req_lock);
-					scredits = *credits;
-					in_flight = server->in_flight;
-					spin_unlock(&server->req_lock);
-
-					trace_smb3_credit_timeout(
-							server->CurrentMid,
-							server->conn_id, server->hostname,
-							scredits, num_credits, in_flight);
-					cifs_server_dbg(VFS, "wait timed out after %d ms\n",
-							timeout);
-					return -EBUSY;
-				}
-				if (rc == -ERESTARTSYS)
-					return -ERESTARTSYS;
-				spin_lock(&server->req_lock);
-				continue;
-			}
-
-			/*
-			 * Can not count locking commands against total
-			 * as they are allowed to block on server.
-			 */
-
-			/* update # of requests on the wire to server */
-			if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) {
-				*credits -= num_credits;
-				server->in_flight += num_credits;
-				if (server->in_flight > server->max_in_flight)
-					server->max_in_flight = server->in_flight;
-				*instance = server->reconnect_instance;
-			}
-			scredits = *credits;
-			in_flight = server->in_flight;
-			spin_unlock(&server->req_lock);
-
-			trace_smb3_waitff_credits(server->CurrentMid,
-					server->conn_id, server->hostname, scredits,
-					-(num_credits), in_flight);
-			cifs_dbg(FYI, "%s: remove %u credits total=%d\n",
-					__func__, num_credits, scredits);
-			break;
-		}
-	}
-	return 0;
-}
-
-static int
-wait_for_free_request(struct TCP_Server_Info *server, const int flags,
-		      unsigned int *instance)
-{
-	return wait_for_free_credits(server, 1, -1, flags,
-				     instance);
-}
-
-static int
-wait_for_compound_request(struct TCP_Server_Info *server, int num,
-			  const int flags, unsigned int *instance)
-{
-	int *credits;
-	int scredits, in_flight;
-
-	credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK);
-
-	spin_lock(&server->req_lock);
-	scredits = *credits;
-	in_flight = server->in_flight;
-
-	if (*credits < num) {
-		/*
-		 * If the server is tight on resources or just gives us less
-		 * credits for other reasons (e.g. requests are coming out of
-		 * order and the server delays granting more credits until it
-		 * processes a missing mid) and we exhausted most available
-		 * credits there may be situations when we try to send
-		 * a compound request but we don't have enough credits. At this
-		 * point the client needs to decide if it should wait for
-		 * additional credits or fail the request. If at least one
-		 * request is in flight there is a high probability that the
-		 * server will return enough credits to satisfy this compound
-		 * request.
-		 *
-		 * Return immediately if no requests in flight since we will be
-		 * stuck on waiting for credits.
-		 */
-		if (server->in_flight == 0) {
-			spin_unlock(&server->req_lock);
-			trace_smb3_insufficient_credits(server->CurrentMid,
-					server->conn_id, server->hostname, scredits,
-					num, in_flight);
-			cifs_dbg(FYI, "%s: %d requests in flight, needed %d total=%d\n",
-					__func__, in_flight, num, scredits);
-			return -EDEADLK;
-		}
-	}
-	spin_unlock(&server->req_lock);
-
-	return wait_for_free_credits(server, num, 60000, flags,
-				     instance);
-}
-
-int
-cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
-		      unsigned int *num, struct cifs_credits *credits)
-{
-	*num = size;
-	credits->value = 0;
-	credits->instance = server->reconnect_instance;
-	return 0;
-}
-
-static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
-			struct mid_q_entry **ppmidQ)
-{
-	spin_lock(&ses->ses_lock);
-	if (ses->ses_status == SES_NEW) {
-		if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
-			(in_buf->Command != SMB_COM_NEGOTIATE)) {
-			spin_unlock(&ses->ses_lock);
-			return -EAGAIN;
-		}
-		/* else ok - we are setting up session */
-	}
-
-	if (ses->ses_status == SES_EXITING) {
-		/* check if SMB session is bad because we are setting it up */
-		if (in_buf->Command != SMB_COM_LOGOFF_ANDX) {
-			spin_unlock(&ses->ses_lock);
-			return -EAGAIN;
-		}
-		/* else ok - we are shutting down session */
-	}
-	spin_unlock(&ses->ses_lock);
-
-	*ppmidQ = alloc_mid(in_buf, ses->server);
-	if (*ppmidQ == NULL)
-		return -ENOMEM;
-	spin_lock(&ses->server->mid_lock);
-	list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
-	spin_unlock(&ses->server->mid_lock);
-	return 0;
-}
-
-static int
-wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
-{
-	int error;
-
-	error = wait_event_state(server->response_q,
-				 midQ->mid_state != MID_REQUEST_SUBMITTED,
-				 (TASK_KILLABLE|TASK_FREEZABLE_UNSAFE));
-	if (error < 0)
-		return -ERESTARTSYS;
-
-	return 0;
-}
-
-struct mid_q_entry *
-cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
-{
-	int rc;
-	struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
-	struct mid_q_entry *mid;
-
-	if (rqst->rq_iov[0].iov_len != 4 ||
-	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
-		return ERR_PTR(-EIO);
-
-	/* enable signing if server requires it */
-	if (server->sign)
-		hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
-
-	mid = alloc_mid(hdr, server);
-	if (mid == NULL)
-		return ERR_PTR(-ENOMEM);
-
-	rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
-	if (rc) {
-		release_mid(mid);
-		return ERR_PTR(rc);
-	}
-
-	return mid;
-}
-
-/*
- * Send a SMB request and set the callback function in the mid to handle
- * the result. Caller is responsible for dealing with timeouts.
- */
-int
-cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
-		mid_receive_t *receive, mid_callback_t *callback,
-		mid_handle_t *handle, void *cbdata, const int flags,
-		const struct cifs_credits *exist_credits)
-{
-	int rc;
-	struct mid_q_entry *mid;
-	struct cifs_credits credits = { .value = 0, .instance = 0 };
-	unsigned int instance;
-	int optype;
-
-	optype = flags & CIFS_OP_MASK;
-
-	if ((flags & CIFS_HAS_CREDITS) == 0) {
-		rc = wait_for_free_request(server, flags, &instance);
-		if (rc)
-			return rc;
-		credits.value = 1;
-		credits.instance = instance;
-	} else
-		instance = exist_credits->instance;
-
-	cifs_server_lock(server);
-
-	/*
-	 * We can't use credits obtained from the previous session to send this
-	 * request. Check if there were reconnects after we obtained credits and
-	 * return -EAGAIN in such cases to let callers handle it.
-	 */
-	if (instance != server->reconnect_instance) {
-		cifs_server_unlock(server);
-		add_credits_and_wake_if(server, &credits, optype);
-		return -EAGAIN;
-	}
-
-	mid = server->ops->setup_async_request(server, rqst);
-	if (IS_ERR(mid)) {
-		cifs_server_unlock(server);
-		add_credits_and_wake_if(server, &credits, optype);
-		return PTR_ERR(mid);
-	}
-
-	mid->receive = receive;
-	mid->callback = callback;
-	mid->callback_data = cbdata;
-	mid->handle = handle;
-	mid->mid_state = MID_REQUEST_SUBMITTED;
-
-	/* put it on the pending_mid_q */
-	spin_lock(&server->mid_lock);
-	list_add_tail(&mid->qhead, &server->pending_mid_q);
-	spin_unlock(&server->mid_lock);
-
-	/*
-	 * Need to store the time in mid before calling I/O. For call_async,
-	 * I/O response may come back and free the mid entry on another thread.
-	 */
-	cifs_save_when_sent(mid);
-	rc = smb_send_rqst(server, 1, rqst, flags);
-
-	if (rc < 0) {
-		revert_current_mid(server, mid->credits);
-		server->sequence_number -= 2;
-		delete_mid(mid);
-	}
-
-	cifs_server_unlock(server);
-
-	if (rc == 0)
-		return 0;
-
-	add_credits_and_wake_if(server, &credits, optype);
-	return rc;
-}
-
-/*
- *
- * Send an SMB Request.  No response info (other than return code)
- * needs to be parsed.
- *
- * flags indicate the type of request buffer and how long to wait
- * and whether to log NT STATUS code (error) before mapping it to POSIX error
- *
- */
-int
-SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
-		 char *in_buf, int flags)
-{
-	int rc;
-	struct kvec iov[1];
-	struct kvec rsp_iov;
-	int resp_buf_type;
-
-	iov[0].iov_base = in_buf;
-	iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
-	flags |= CIFS_NO_RSP_BUF;
-	rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
-	cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc);
-
-	return rc;
-}
-
-static int
-cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
-{
-	int rc = 0;
-
-	cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n",
-		 __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state);
-
-	spin_lock(&server->mid_lock);
-	switch (mid->mid_state) {
-	case MID_RESPONSE_RECEIVED:
-		spin_unlock(&server->mid_lock);
-		return rc;
-	case MID_RETRY_NEEDED:
-		rc = -EAGAIN;
-		break;
-	case MID_RESPONSE_MALFORMED:
-		rc = -EIO;
-		break;
-	case MID_SHUTDOWN:
-		rc = -EHOSTDOWN;
-		break;
-	default:
-		if (!(mid->mid_flags & MID_DELETED)) {
-			list_del_init(&mid->qhead);
-			mid->mid_flags |= MID_DELETED;
-		}
-		cifs_server_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n",
-			 __func__, mid->mid, mid->mid_state);
-		rc = -EIO;
-	}
-	spin_unlock(&server->mid_lock);
-
-	release_mid(mid);
-	return rc;
-}
-
-static inline int
-send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,
-	    struct mid_q_entry *mid)
-{
-	return server->ops->send_cancel ?
-				server->ops->send_cancel(server, rqst, mid) : 0;
-}
-
-int
-cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
-		   bool log_error)
-{
-	unsigned int len = get_rfc1002_length(mid->resp_buf) + 4;
-
-	dump_smb(mid->resp_buf, min_t(u32, 92, len));
-
-	/* convert the length into a more usable form */
-	if (server->sign) {
-		struct kvec iov[2];
-		int rc = 0;
-		struct smb_rqst rqst = { .rq_iov = iov,
-					 .rq_nvec = 2 };
-
-		iov[0].iov_base = mid->resp_buf;
-		iov[0].iov_len = 4;
-		iov[1].iov_base = (char *)mid->resp_buf + 4;
-		iov[1].iov_len = len - 4;
-		/* FIXME: add code to kill session */
-		rc = cifs_verify_signature(&rqst, server,
-					   mid->sequence_number);
-		if (rc)
-			cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n",
-				 rc);
-	}
-
-	/* BB special case reconnect tid and uid here? */
-	return map_and_check_smb_error(mid, log_error);
-}
-
-struct mid_q_entry *
-cifs_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *ignored,
-		   struct smb_rqst *rqst)
-{
-	int rc;
-	struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
-	struct mid_q_entry *mid;
-
-	if (rqst->rq_iov[0].iov_len != 4 ||
-	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
-		return ERR_PTR(-EIO);
-
-	rc = allocate_mid(ses, hdr, &mid);
-	if (rc)
-		return ERR_PTR(rc);
-	rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number);
-	if (rc) {
-		delete_mid(mid);
-		return ERR_PTR(rc);
-	}
-	return mid;
-}
-
-static void
-cifs_compound_callback(struct mid_q_entry *mid)
-{
-	struct TCP_Server_Info *server = mid->server;
-	struct cifs_credits credits;
-
-	credits.value = server->ops->get_credits(mid);
-	credits.instance = server->reconnect_instance;
-
-	add_credits(server, &credits, mid->optype);
-}
-
-static void
-cifs_compound_last_callback(struct mid_q_entry *mid)
-{
-	cifs_compound_callback(mid);
-	cifs_wake_up_task(mid);
-}
-
-static void
-cifs_cancelled_callback(struct mid_q_entry *mid)
-{
-	cifs_compound_callback(mid);
-	release_mid(mid);
-}
-
-/*
- * Return a channel (master if none) of @ses that can be used to send
- * regular requests.
- *
- * If we are currently binding a new channel (negprot/sess.setup),
- * return the new incomplete channel.
- */
-struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses)
-{
-	uint index = 0;
-	unsigned int min_in_flight = UINT_MAX, max_in_flight = 0;
-	struct TCP_Server_Info *server = NULL;
-	int i;
-
-	if (!ses)
-		return NULL;
-
-	spin_lock(&ses->chan_lock);
-	for (i = 0; i < ses->chan_count; i++) {
-		server = ses->chans[i].server;
-		if (!server)
-			continue;
-
-		/*
-		 * strictly speaking, we should pick up req_lock to read
-		 * server->in_flight. But it shouldn't matter much here if we
-		 * race while reading this data. The worst that can happen is
-		 * that we could use a channel that's not least loaded. Avoiding
-		 * taking the lock could help reduce wait time, which is
-		 * important for this function
-		 */
-		if (server->in_flight < min_in_flight) {
-			min_in_flight = server->in_flight;
-			index = i;
-		}
-		if (server->in_flight > max_in_flight)
-			max_in_flight = server->in_flight;
-	}
-
-	/* if all channels are equally loaded, fall back to round-robin */
-	if (min_in_flight == max_in_flight) {
-		index = (uint)atomic_inc_return(&ses->chan_seq);
-		index %= ses->chan_count;
-	}
-	spin_unlock(&ses->chan_lock);
-
-	return ses->chans[index].server;
-}
-
-int
-compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
-		   struct TCP_Server_Info *server,
-		   const int flags, const int num_rqst, struct smb_rqst *rqst,
-		   int *resp_buf_type, struct kvec *resp_iov)
-{
-	int i, j, optype, rc = 0;
-	struct mid_q_entry *midQ[MAX_COMPOUND];
-	bool cancelled_mid[MAX_COMPOUND] = {false};
-	struct cifs_credits credits[MAX_COMPOUND] = {
-		{ .value = 0, .instance = 0 }
-	};
-	unsigned int instance;
-	char *buf;
-
-	optype = flags & CIFS_OP_MASK;
-
-	for (i = 0; i < num_rqst; i++)
-		resp_buf_type[i] = CIFS_NO_BUFFER;  /* no response buf yet */
-
-	if (!ses || !ses->server || !server) {
-		cifs_dbg(VFS, "Null session\n");
-		return -EIO;
-	}
-
-	spin_lock(&server->srv_lock);
-	if (server->tcpStatus == CifsExiting) {
-		spin_unlock(&server->srv_lock);
-		return -ENOENT;
-	}
-	spin_unlock(&server->srv_lock);
-
-	/*
-	 * Wait for all the requests to become available.
-	 * This approach still leaves the possibility to be stuck waiting for
-	 * credits if the server doesn't grant credits to the outstanding
-	 * requests and if the client is completely idle, not generating any
-	 * other requests.
-	 * This can be handled by the eventual session reconnect.
-	 */
-	rc = wait_for_compound_request(server, num_rqst, flags,
-				       &instance);
-	if (rc)
-		return rc;
-
-	for (i = 0; i < num_rqst; i++) {
-		credits[i].value = 1;
-		credits[i].instance = instance;
-	}
-
-	/*
-	 * Make sure that we sign in the same order that we send on this socket
-	 * and avoid races inside tcp sendmsg code that could cause corruption
-	 * of smb data.
-	 */
-
-	cifs_server_lock(server);
-
-	/*
-	 * All the parts of the compound chain belong obtained credits from the
-	 * same session. We can not use credits obtained from the previous
-	 * session to send this request. Check if there were reconnects after
-	 * we obtained credits and return -EAGAIN in such cases to let callers
-	 * handle it.
-	 */
-	if (instance != server->reconnect_instance) {
-		cifs_server_unlock(server);
-		for (j = 0; j < num_rqst; j++)
-			add_credits(server, &credits[j], optype);
-		return -EAGAIN;
-	}
-
-	for (i = 0; i < num_rqst; i++) {
-		midQ[i] = server->ops->setup_request(ses, server, &rqst[i]);
-		if (IS_ERR(midQ[i])) {
-			revert_current_mid(server, i);
-			for (j = 0; j < i; j++)
-				delete_mid(midQ[j]);
-			cifs_server_unlock(server);
-
-			/* Update # of requests on wire to server */
-			for (j = 0; j < num_rqst; j++)
-				add_credits(server, &credits[j], optype);
-			return PTR_ERR(midQ[i]);
-		}
-
-		midQ[i]->mid_state = MID_REQUEST_SUBMITTED;
-		midQ[i]->optype = optype;
-		/*
-		 * Invoke callback for every part of the compound chain
-		 * to calculate credits properly. Wake up this thread only when
-		 * the last element is received.
-		 */
-		if (i < num_rqst - 1)
-			midQ[i]->callback = cifs_compound_callback;
-		else
-			midQ[i]->callback = cifs_compound_last_callback;
-	}
-	rc = smb_send_rqst(server, num_rqst, rqst, flags);
-
-	for (i = 0; i < num_rqst; i++)
-		cifs_save_when_sent(midQ[i]);
-
-	if (rc < 0) {
-		revert_current_mid(server, num_rqst);
-		server->sequence_number -= 2;
-	}
-
-	cifs_server_unlock(server);
-
-	/*
-	 * If sending failed for some reason or it is an oplock break that we
-	 * will not receive a response to - return credits back
-	 */
-	if (rc < 0 || (flags & CIFS_NO_SRV_RSP)) {
-		for (i = 0; i < num_rqst; i++)
-			add_credits(server, &credits[i], optype);
-		goto out;
-	}
-
-	/*
-	 * At this point the request is passed to the network stack - we assume
-	 * that any credits taken from the server structure on the client have
-	 * been spent and we can't return them back. Once we receive responses
-	 * we will collect credits granted by the server in the mid callbacks
-	 * and add those credits to the server structure.
-	 */
-
-	/*
-	 * Compounding is never used during session establish.
-	 */
-	spin_lock(&ses->ses_lock);
-	if ((ses->ses_status == SES_NEW) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) {
-		spin_unlock(&ses->ses_lock);
-
-		cifs_server_lock(server);
-		smb311_update_preauth_hash(ses, server, rqst[0].rq_iov, rqst[0].rq_nvec);
-		cifs_server_unlock(server);
-
-		spin_lock(&ses->ses_lock);
-	}
-	spin_unlock(&ses->ses_lock);
-
-	for (i = 0; i < num_rqst; i++) {
-		rc = wait_for_response(server, midQ[i]);
-		if (rc != 0)
-			break;
-	}
-	if (rc != 0) {
-		for (; i < num_rqst; i++) {
-			cifs_server_dbg(FYI, "Cancelling wait for mid %llu cmd: %d\n",
-				 midQ[i]->mid, le16_to_cpu(midQ[i]->command));
-			send_cancel(server, &rqst[i], midQ[i]);
-			spin_lock(&server->mid_lock);
-			midQ[i]->mid_flags |= MID_WAIT_CANCELLED;
-			if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) {
-				midQ[i]->callback = cifs_cancelled_callback;
-				cancelled_mid[i] = true;
-				credits[i].value = 0;
-			}
-			spin_unlock(&server->mid_lock);
-		}
-	}
-
-	for (i = 0; i < num_rqst; i++) {
-		if (rc < 0)
-			goto out;
-
-		rc = cifs_sync_mid_result(midQ[i], server);
-		if (rc != 0) {
-			/* mark this mid as cancelled to not free it below */
-			cancelled_mid[i] = true;
-			goto out;
-		}
-
-		if (!midQ[i]->resp_buf ||
-		    midQ[i]->mid_state != MID_RESPONSE_RECEIVED) {
-			rc = -EIO;
-			cifs_dbg(FYI, "Bad MID state?\n");
-			goto out;
-		}
-
-		buf = (char *)midQ[i]->resp_buf;
-		resp_iov[i].iov_base = buf;
-		resp_iov[i].iov_len = midQ[i]->resp_buf_size +
-			HEADER_PREAMBLE_SIZE(server);
-
-		if (midQ[i]->large_buf)
-			resp_buf_type[i] = CIFS_LARGE_BUFFER;
-		else
-			resp_buf_type[i] = CIFS_SMALL_BUFFER;
-
-		rc = server->ops->check_receive(midQ[i], server,
-						     flags & CIFS_LOG_ERROR);
-
-		/* mark it so buf will not be freed by delete_mid */
-		if ((flags & CIFS_NO_RSP_BUF) == 0)
-			midQ[i]->resp_buf = NULL;
-
-	}
-
-	/*
-	 * Compounding is never used during session establish.
-	 */
-	spin_lock(&ses->ses_lock);
-	if ((ses->ses_status == SES_NEW) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) {
-		struct kvec iov = {
-			.iov_base = resp_iov[0].iov_base,
-			.iov_len = resp_iov[0].iov_len
-		};
-		spin_unlock(&ses->ses_lock);
-		cifs_server_lock(server);
-		smb311_update_preauth_hash(ses, server, &iov, 1);
-		cifs_server_unlock(server);
-		spin_lock(&ses->ses_lock);
-	}
-	spin_unlock(&ses->ses_lock);
-
-out:
-	/*
-	 * This will dequeue all mids. After this it is important that the
-	 * demultiplex_thread will not process any of these mids any futher.
-	 * This is prevented above by using a noop callback that will not
-	 * wake this thread except for the very last PDU.
-	 */
-	for (i = 0; i < num_rqst; i++) {
-		if (!cancelled_mid[i])
-			delete_mid(midQ[i]);
-	}
-
-	return rc;
-}
-
-int
-cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
-	       struct TCP_Server_Info *server,
-	       struct smb_rqst *rqst, int *resp_buf_type, const int flags,
-	       struct kvec *resp_iov)
-{
-	return compound_send_recv(xid, ses, server, flags, 1,
-				  rqst, resp_buf_type, resp_iov);
-}
-
-int
-SendReceive2(const unsigned int xid, struct cifs_ses *ses,
-	     struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
-	     const int flags, struct kvec *resp_iov)
-{
-	struct smb_rqst rqst;
-	struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov;
-	int rc;
-
-	if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
-		new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec),
-					GFP_KERNEL);
-		if (!new_iov) {
-			/* otherwise cifs_send_recv below sets resp_buf_type */
-			*resp_buf_type = CIFS_NO_BUFFER;
-			return -ENOMEM;
-		}
-	} else
-		new_iov = s_iov;
-
-	/* 1st iov is a RFC1001 length followed by the rest of the packet */
-	memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));
-
-	new_iov[0].iov_base = new_iov[1].iov_base;
-	new_iov[0].iov_len = 4;
-	new_iov[1].iov_base += 4;
-	new_iov[1].iov_len -= 4;
-
-	memset(&rqst, 0, sizeof(struct smb_rqst));
-	rqst.rq_iov = new_iov;
-	rqst.rq_nvec = n_vec + 1;
-
-	rc = cifs_send_recv(xid, ses, ses->server,
-			    &rqst, resp_buf_type, flags, resp_iov);
-	if (n_vec + 1 > CIFS_MAX_IOV_SIZE)
-		kfree(new_iov);
-	return rc;
-}
-
-int
-SendReceive(const unsigned int xid, struct cifs_ses *ses,
-	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
-	    int *pbytes_returned, const int flags)
-{
-	int rc = 0;
-	struct mid_q_entry *midQ;
-	unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
-	struct kvec iov = { .iov_base = in_buf, .iov_len = len };
-	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
-	struct cifs_credits credits = { .value = 1, .instance = 0 };
-	struct TCP_Server_Info *server;
-
-	if (ses == NULL) {
-		cifs_dbg(VFS, "Null smb session\n");
-		return -EIO;
-	}
-	server = ses->server;
-	if (server == NULL) {
-		cifs_dbg(VFS, "Null tcp session\n");
-		return -EIO;
-	}
-
-	spin_lock(&server->srv_lock);
-	if (server->tcpStatus == CifsExiting) {
-		spin_unlock(&server->srv_lock);
-		return -ENOENT;
-	}
-	spin_unlock(&server->srv_lock);
-
-	/* Ensure that we do not send more than 50 overlapping requests
-	   to the same server. We may make this configurable later or
-	   use ses->maxReq */
-
-	if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
-		cifs_server_dbg(VFS, "Invalid length, greater than maximum frame, %d\n",
-				len);
-		return -EIO;
-	}
-
-	rc = wait_for_free_request(server, flags, &credits.instance);
-	if (rc)
-		return rc;
-
-	/* make sure that we sign in the same order that we send on this socket
-	   and avoid races inside tcp sendmsg code that could cause corruption
-	   of smb data */
-
-	cifs_server_lock(server);
-
-	rc = allocate_mid(ses, in_buf, &midQ);
-	if (rc) {
-		cifs_server_unlock(server);
-		/* Update # of requests on wire to server */
-		add_credits(server, &credits, 0);
-		return rc;
-	}
-
-	rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number);
-	if (rc) {
-		cifs_server_unlock(server);
-		goto out;
-	}
-
-	midQ->mid_state = MID_REQUEST_SUBMITTED;
-
-	rc = smb_send(server, in_buf, len);
-	cifs_save_when_sent(midQ);
-
-	if (rc < 0)
-		server->sequence_number -= 2;
-
-	cifs_server_unlock(server);
-
-	if (rc < 0)
-		goto out;
-
-	rc = wait_for_response(server, midQ);
-	if (rc != 0) {
-		send_cancel(server, &rqst, midQ);
-		spin_lock(&server->mid_lock);
-		if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
-			/* no longer considered to be "in-flight" */
-			midQ->callback = release_mid;
-			spin_unlock(&server->mid_lock);
-			add_credits(server, &credits, 0);
-			return rc;
-		}
-		spin_unlock(&server->mid_lock);
-	}
-
-	rc = cifs_sync_mid_result(midQ, server);
-	if (rc != 0) {
-		add_credits(server, &credits, 0);
-		return rc;
-	}
-
-	if (!midQ->resp_buf || !out_buf ||
-	    midQ->mid_state != MID_RESPONSE_RECEIVED) {
-		rc = -EIO;
-		cifs_server_dbg(VFS, "Bad MID state?\n");
-		goto out;
-	}
-
-	*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
-	memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
-	rc = cifs_check_receive(midQ, server, 0);
-out:
-	delete_mid(midQ);
-	add_credits(server, &credits, 0);
-
-	return rc;
-}
-
-/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
-   blocking lock to return. */
-
-static int
-send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
-			struct smb_hdr *in_buf,
-			struct smb_hdr *out_buf)
-{
-	int bytes_returned;
-	struct cifs_ses *ses = tcon->ses;
-	LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
-
-	/* We just modify the current in_buf to change
-	   the type of lock from LOCKING_ANDX_SHARED_LOCK
-	   or LOCKING_ANDX_EXCLUSIVE_LOCK to
-	   LOCKING_ANDX_CANCEL_LOCK. */
-
-	pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
-	pSMB->Timeout = 0;
-	pSMB->hdr.Mid = get_next_mid(ses->server);
-
-	return SendReceive(xid, ses, in_buf, out_buf,
-			&bytes_returned, 0);
-}
-
-int
-SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
-	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
-	    int *pbytes_returned)
-{
-	int rc = 0;
-	int rstart = 0;
-	struct mid_q_entry *midQ;
-	struct cifs_ses *ses;
-	unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
-	struct kvec iov = { .iov_base = in_buf, .iov_len = len };
-	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
-	unsigned int instance;
-	struct TCP_Server_Info *server;
-
-	if (tcon == NULL || tcon->ses == NULL) {
-		cifs_dbg(VFS, "Null smb session\n");
-		return -EIO;
-	}
-	ses = tcon->ses;
-	server = ses->server;
-
-	if (server == NULL) {
-		cifs_dbg(VFS, "Null tcp session\n");
-		return -EIO;
-	}
-
-	spin_lock(&server->srv_lock);
-	if (server->tcpStatus == CifsExiting) {
-		spin_unlock(&server->srv_lock);
-		return -ENOENT;
-	}
-	spin_unlock(&server->srv_lock);
-
-	/* Ensure that we do not send more than 50 overlapping requests
-	   to the same server. We may make this configurable later or
-	   use ses->maxReq */
-
-	if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
-		cifs_tcon_dbg(VFS, "Invalid length, greater than maximum frame, %d\n",
-			      len);
-		return -EIO;
-	}
-
-	rc = wait_for_free_request(server, CIFS_BLOCKING_OP, &instance);
-	if (rc)
-		return rc;
-
-	/* make sure that we sign in the same order that we send on this socket
-	   and avoid races inside tcp sendmsg code that could cause corruption
-	   of smb data */
-
-	cifs_server_lock(server);
-
-	rc = allocate_mid(ses, in_buf, &midQ);
-	if (rc) {
-		cifs_server_unlock(server);
-		return rc;
-	}
-
-	rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number);
-	if (rc) {
-		delete_mid(midQ);
-		cifs_server_unlock(server);
-		return rc;
-	}
-
-	midQ->mid_state = MID_REQUEST_SUBMITTED;
-	rc = smb_send(server, in_buf, len);
-	cifs_save_when_sent(midQ);
-
-	if (rc < 0)
-		server->sequence_number -= 2;
-
-	cifs_server_unlock(server);
-
-	if (rc < 0) {
-		delete_mid(midQ);
-		return rc;
-	}
-
-	/* Wait for a reply - allow signals to interrupt. */
-	rc = wait_event_interruptible(server->response_q,
-		(!(midQ->mid_state == MID_REQUEST_SUBMITTED)) ||
-		((server->tcpStatus != CifsGood) &&
-		 (server->tcpStatus != CifsNew)));
-
-	/* Were we interrupted by a signal ? */
-	spin_lock(&server->srv_lock);
-	if ((rc == -ERESTARTSYS) &&
-		(midQ->mid_state == MID_REQUEST_SUBMITTED) &&
-		((server->tcpStatus == CifsGood) ||
-		 (server->tcpStatus == CifsNew))) {
-		spin_unlock(&server->srv_lock);
-
-		if (in_buf->Command == SMB_COM_TRANSACTION2) {
-			/* POSIX lock. We send a NT_CANCEL SMB to cause the
-			   blocking lock to return. */
-			rc = send_cancel(server, &rqst, midQ);
-			if (rc) {
-				delete_mid(midQ);
-				return rc;
-			}
-		} else {
-			/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
-			   to cause the blocking lock to return. */
-
-			rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
-
-			/* If we get -ENOLCK back the lock may have
-			   already been removed. Don't exit in this case. */
-			if (rc && rc != -ENOLCK) {
-				delete_mid(midQ);
-				return rc;
-			}
-		}
-
-		rc = wait_for_response(server, midQ);
-		if (rc) {
-			send_cancel(server, &rqst, midQ);
-			spin_lock(&server->mid_lock);
-			if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
-				/* no longer considered to be "in-flight" */
-				midQ->callback = release_mid;
-				spin_unlock(&server->mid_lock);
-				return rc;
-			}
-			spin_unlock(&server->mid_lock);
-		}
-
-		/* We got the response - restart system call. */
-		rstart = 1;
-		spin_lock(&server->srv_lock);
-	}
-	spin_unlock(&server->srv_lock);
-
-	rc = cifs_sync_mid_result(midQ, server);
-	if (rc != 0)
-		return rc;
-
-	/* rcvd frame is ok */
-	if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) {
-		rc = -EIO;
-		cifs_tcon_dbg(VFS, "Bad MID state?\n");
-		goto out;
-	}
-
-	*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
-	memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
-	rc = cifs_check_receive(midQ, server, 0);
-out:
-	delete_mid(midQ);
-	if (rstart && rc == -EACCES)
-		return -ERESTARTSYS;
-	return rc;
-}
-
-/*
- * Discard any remaining data in the current SMB. To do this, we borrow the
- * current bigbuf.
- */
-int
-cifs_discard_remaining_data(struct TCP_Server_Info *server)
-{
-	unsigned int rfclen = server->pdu_size;
-	size_t remaining = rfclen + HEADER_PREAMBLE_SIZE(server) -
-		server->total_read;
-
-	while (remaining > 0) {
-		ssize_t length;
-
-		length = cifs_discard_from_socket(server,
-				min_t(size_t, remaining,
-				      CIFSMaxBufSize + MAX_HEADER_SIZE(server)));
-		if (length < 0)
-			return length;
-		server->total_read += length;
-		remaining -= length;
-	}
-
-	return 0;
-}
-
-static int
-__cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid,
-		     bool malformed)
-{
-	int length;
-
-	length = cifs_discard_remaining_data(server);
-	dequeue_mid(mid, malformed);
-	mid->resp_buf = server->smallbuf;
-	server->smallbuf = NULL;
-	return length;
-}
-
-static int
-cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
-{
-	struct cifs_readdata *rdata = mid->callback_data;
-
-	return  __cifs_readv_discard(server, mid, rdata->result);
-}
-
-int
-cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
-{
-	int length, len;
-	unsigned int data_offset, data_len;
-	struct cifs_readdata *rdata = mid->callback_data;
-	char *buf = server->smallbuf;
-	unsigned int buflen = server->pdu_size + HEADER_PREAMBLE_SIZE(server);
-	bool use_rdma_mr = false;
-
-	cifs_dbg(FYI, "%s: mid=%llu offset=%llu bytes=%u\n",
-		 __func__, mid->mid, rdata->offset, rdata->bytes);
-
-	/*
-	 * read the rest of READ_RSP header (sans Data array), or whatever we
-	 * can if there's not enough data. At this point, we've read down to
-	 * the Mid.
-	 */
-	len = min_t(unsigned int, buflen, server->vals->read_rsp_size) -
-							HEADER_SIZE(server) + 1;
-
-	length = cifs_read_from_socket(server,
-				       buf + HEADER_SIZE(server) - 1, len);
-	if (length < 0)
-		return length;
-	server->total_read += length;
-
-	if (server->ops->is_session_expired &&
-	    server->ops->is_session_expired(buf)) {
-		cifs_reconnect(server, true);
-		return -1;
-	}
-
-	if (server->ops->is_status_pending &&
-	    server->ops->is_status_pending(buf, server)) {
-		cifs_discard_remaining_data(server);
-		return -1;
-	}
-
-	/* set up first two iov for signature check and to get credits */
-	rdata->iov[0].iov_base = buf;
-	rdata->iov[0].iov_len = HEADER_PREAMBLE_SIZE(server);
-	rdata->iov[1].iov_base = buf + HEADER_PREAMBLE_SIZE(server);
-	rdata->iov[1].iov_len =
-		server->total_read - HEADER_PREAMBLE_SIZE(server);
-	cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
-		 rdata->iov[0].iov_base, rdata->iov[0].iov_len);
-	cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
-		 rdata->iov[1].iov_base, rdata->iov[1].iov_len);
-
-	/* Was the SMB read successful? */
-	rdata->result = server->ops->map_error(buf, false);
-	if (rdata->result != 0) {
-		cifs_dbg(FYI, "%s: server returned error %d\n",
-			 __func__, rdata->result);
-		/* normal error on read response */
-		return __cifs_readv_discard(server, mid, false);
-	}
-
-	/* Is there enough to get to the rest of the READ_RSP header? */
-	if (server->total_read < server->vals->read_rsp_size) {
-		cifs_dbg(FYI, "%s: server returned short header. got=%u expected=%zu\n",
-			 __func__, server->total_read,
-			 server->vals->read_rsp_size);
-		rdata->result = -EIO;
-		return cifs_readv_discard(server, mid);
-	}
-
-	data_offset = server->ops->read_data_offset(buf) +
-		HEADER_PREAMBLE_SIZE(server);
-	if (data_offset < server->total_read) {
-		/*
-		 * win2k8 sometimes sends an offset of 0 when the read
-		 * is beyond the EOF. Treat it as if the data starts just after
-		 * the header.
-		 */
-		cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
-			 __func__, data_offset);
-		data_offset = server->total_read;
-	} else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
-		/* data_offset is beyond the end of smallbuf */
-		cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
-			 __func__, data_offset);
-		rdata->result = -EIO;
-		return cifs_readv_discard(server, mid);
-	}
-
-	cifs_dbg(FYI, "%s: total_read=%u data_offset=%u\n",
-		 __func__, server->total_read, data_offset);
-
-	len = data_offset - server->total_read;
-	if (len > 0) {
-		/* read any junk before data into the rest of smallbuf */
-		length = cifs_read_from_socket(server,
-					       buf + server->total_read, len);
-		if (length < 0)
-			return length;
-		server->total_read += length;
-	}
-
-	/* how much data is in the response? */
-#ifdef CONFIG_CIFS_SMB_DIRECT
-	use_rdma_mr = rdata->mr;
-#endif
-	data_len = server->ops->read_data_length(buf, use_rdma_mr);
-	if (!use_rdma_mr && (data_offset + data_len > buflen)) {
-		/* data_len is corrupt -- discard frame */
-		rdata->result = -EIO;
-		return cifs_readv_discard(server, mid);
-	}
-
-#ifdef CONFIG_CIFS_SMB_DIRECT
-	if (rdata->mr)
-		length = data_len; /* An RDMA read is already done. */
-	else
-#endif
-		length = cifs_read_iter_from_socket(server, &rdata->iter,
-						    data_len);
-	if (length > 0)
-		rdata->got_bytes += length;
-	server->total_read += length;
-
-	cifs_dbg(FYI, "total_read=%u buflen=%u remaining=%u\n",
-		 server->total_read, buflen, data_len);
-
-	/* discard anything left over */
-	if (server->total_read < buflen)
-		return cifs_readv_discard(server, mid);
-
-	dequeue_mid(mid, false);
-	mid->resp_buf = server->smallbuf;
-	server->smallbuf = NULL;
-	return length;
-}