Release 4.10 fs/cifs/transport.c

/*
 *   fs/cifs/transport.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2008
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *   Jeremy Allison (jra@samba.org) 2006.
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#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 "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"


void

cifs_wake_up_task(struct mid_q_entry *mid)
{
	wake_up_process(mid->callback_data);
}

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struct mid_q_entry *

AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
{
	struct mid_q_entry *temp;

	if (server == NULL) {
		cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n");
		return NULL;
	}

	temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
	if (temp == NULL)
		return temp;
	else {
		memset(temp, 0, sizeof(struct mid_q_entry));
		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.
                 */
		temp->callback = cifs_wake_up_task;
		temp->callback_data = current;
	}

	atomic_inc(&midCount);
	temp->mid_state = MID_REQUEST_ALLOCATED;
	return temp;
}

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pavel shilovsky
pavel shilovsky
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8.28%
2
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joe perches
joe perches
7
4.46%
2
14.29%
tim gardner
tim gardner
3
1.91%
1
7.14%
jeremy allison
jeremy allison
1
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christoph lameter
christoph lameter
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void

DeleteMidQEntry(struct mid_q_entry *midEntry)
{
#ifdef CONFIG_CIFS_STATS2
	__le16 command = midEntry->server->vals->lock_cmd;
	unsigned long now;
#endif
	midEntry->mid_state = MID_FREE;
	atomic_dec(&midCount);
	if (midEntry->large_buf)
		cifs_buf_release(midEntry->resp_buf);
	else
		cifs_small_buf_release(midEntry->resp_buf);
#ifdef CONFIG_CIFS_STATS2
	now = jiffies;
	/* commands taking longer than one second are indications that
           something is wrong, unless it is quite a slow link or server */
	if ((now - midEntry->when_alloc) > HZ) {
		if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) {
			pr_debug(" CIFS slow rsp: cmd %d mid %llu",
			       midEntry->command, midEntry->mid);
			pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
			       now - midEntry->when_alloc,
			       now - midEntry->when_sent,
			       now - midEntry->when_received);
		}
	}
#endif
	mempool_free(midEntry, cifs_mid_poolp);
}

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steve french
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pavel shilovsky
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2
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andy shevchenko
andy shevchenko
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jeff layton
jeff layton
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void

cifs_delete_mid(struct mid_q_entry *mid)
{
	spin_lock(&GlobalMid_Lock);
	list_del(&mid->qhead);
	spin_unlock(&GlobalMid_Lock);

	DeleteMidQEntry(mid);
}

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/*
 * 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;

	smb_msg->msg_name = (struct sockaddr *) &server->dstaddr;
	smb_msg->msg_namelen = sizeof(struct sockaddr);
	smb_msg->msg_control = NULL;
	smb_msg->msg_controllen = 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_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_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;
}

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al viro
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jeff layton
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joe perches
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pavel shilovsky
pavel shilovsky
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static unsigned long

rqst_len(struct smb_rqst *rqst)
{
	unsigned int i;
	struct kvec *iov = rqst->rq_iov;
	unsigned long buflen = 0;

	/* total up iov array first */
	for (i = 0; i < rqst->rq_nvec; i++)
		buflen += iov[i].iov_len;

	/* add in the page array if there is one */
	if (rqst->rq_npages) {
		buflen += rqst->rq_pagesz * (rqst->rq_npages - 1);
		buflen += rqst->rq_tailsz;
	}

	return buflen;
}

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static int

smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
{
	int rc;
	struct kvec *iov = rqst->rq_iov;
	int n_vec = rqst->rq_nvec;
	unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
	unsigned long send_length;
	unsigned int i;
	size_t total_len = 0, sent, size;
	struct socket *ssocket = server->ssocket;
	struct msghdr smb_msg;
	int val = 1;

	if (ssocket == NULL)
		return -ENOTSOCK;

	/* sanity check send length */
	send_length = rqst_len(rqst);
	if (send_length != smb_buf_length + 4) {
		WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n",
			send_length, smb_buf_length);
		return -EIO;
	}

	cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length);
	dump_smb(iov[0].iov_base, iov[0].iov_len);

	/* cork the socket */
	kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
				(char *)&val, sizeof(val));

	size = 0;
	for (i = 0; i < n_vec; i++)
		size += iov[i].iov_len;

	iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size);

	rc = smb_send_kvec(server, &smb_msg, &sent);
	if (rc < 0)
		goto uncork;

	total_len += sent;

	/* now walk the page array and send each page in it */
	for (i = 0; i < rqst->rq_npages; i++) {
		size_t len = i == rqst->rq_npages - 1
				? rqst->rq_tailsz
				: rqst->rq_pagesz;
		struct bio_vec bvec = {
			.bv_page = rqst->rq_pages[i],
			.bv_len = len
		};
		iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC,
			      &bvec, 1, len);
		rc = smb_send_kvec(server, &smb_msg, &sent);
		if (rc < 0)
			break;

		total_len += sent;
	}

uncork:
	/* uncork it */
	val = 0;
	kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
				(char *)&val, sizeof(val));

	if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
		cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n",
			 smb_buf_length + 4, 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
                 */
		server->tcpStatus = CifsNeedReconnect;
	}

	if (rc < 0 && rc != -EINTR)
		cifs_dbg(VFS, "Error %d sending data on socket to server\n",
			 rc);
	else
		rc = 0;

	return rc;
}

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steve french
steve french
49
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joe perches
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static int

smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
{
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = n_vec };

	return smb_send_rqst(server, &rqst);
}

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int

smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
	 unsigned int smb_buf_length)
{
	struct kvec iov;

	iov.iov_base = smb_buffer;
	iov.iov_len = smb_buf_length + 4;

	return smb_sendv(server, &iov, 1);
}

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static int

wait_for_free_credits(struct TCP_Server_Info *server, const int timeout,
		      int *credits)
{
	int rc;

	spin_lock(&server->req_lock);
	if (timeout == CIFS_ASYNC_OP) {
		/* oplock breaks must not be held up */
		server->in_flight++;
		*credits -= 1;
		spin_unlock(&server->req_lock);
		return 0;
	}

	while (1) {
		if (*credits <= 0) {
			spin_unlock(&server->req_lock);
			cifs_num_waiters_inc(server);
			rc = wait_event_killable(server->request_q,
						 has_credits(server, credits));
			cifs_num_waiters_dec(server);
			if (rc)
				return rc;
			spin_lock(&server->req_lock);
		} else {
			if (server->tcpStatus == CifsExiting) {
				spin_unlock(&server->req_lock);
				return -ENOENT;
			}

			/*
                         * Can not count locking commands against total
                         * as they are allowed to block on server.
                         */

			/* update # of requests on the wire to server */
			if (timeout != CIFS_BLOCKING_OP) {
				*credits -= 1;
				server->in_flight++;
			}
			spin_unlock(&server->req_lock);
			break;
		}
	}
	return 0;
}

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jeremy allison
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volker lendecke
volker lendecke
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jeff layton
jeff layton
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static int

wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
		      const int optype)
{
	int *val;

	val = server->ops->get_credits_field(server, optype);
	/* Since an echo is already inflight, no need to wait to send another */
	if (*val <= 0 && optype == CIFS_ECHO_OP)
		return -EAGAIN;
	return wait_for_free_credits(server, timeout, val);
}

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int

cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
		      unsigned int *num, unsigned int *credits)
{
	*num = size;
	*credits = 0;
	return 0;
}

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static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
			struct mid_q_entry **ppmidQ)
{
	if (ses->server->tcpStatus == CifsExiting) {
		return -ENOENT;
	}

	if (ses->server->tcpStatus == CifsNeedReconnect) {
		cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
		return -EAGAIN;
	}

	if (ses->status == CifsNew) {
		if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
			(in_buf->Command != SMB_COM_NEGOTIATE))
			return -EAGAIN;
		/* else ok - we are setting up session */
	}

	if (ses->status == CifsExiting) {
		/* check if SMB session is bad because we are setting it up */
		if (in_buf->Command != SMB_COM_LOGOFF_ANDX)
			return -EAGAIN;
		/* else ok - we are shutting down session */
	}

	*ppmidQ = AllocMidQEntry(in_buf, ses->server);
	if (*ppmidQ == NULL)
		return -ENOMEM;
	spin_lock(&GlobalMid_Lock);
	list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
	spin_unlock(&GlobalMid_Lock);
	return 0;
}

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jeremy allison
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shirish pargaonkar
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14.94%
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joe perches
joe perches
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static int

wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
{
	int error;

	error = wait_event_freezekillable_unsafe(server->response_q,
				    midQ->mid_state != MID_REQUEST_SUBMITTED);
	if (error < 0)
		return -ERESTARTSYS;

	return 0;
}

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jeff layton
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colin cross
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pavel shilovsky
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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;

	/* enable signing if server requires it */
	if (server->sign)
		hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

	mid = AllocMidQEntry(hdr, server);
	if (mid == NULL)
		return ERR_PTR(-ENOMEM);

	rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
	if (rc) {
		DeleteMidQEntry(mid);
		return ERR_PTR(rc);
	}

	return mid;
}

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sachin prabhu
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/*
 * 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,
		void *cbdata, const int flags)
{
	int rc, timeout, optype;
	struct mid_q_entry *mid;
	unsigned int credits = 0;

	timeout = flags & CIFS_TIMEOUT_MASK;
	optype = flags & CIFS_OP_MASK;

	if ((flags & CIFS_HAS_CREDITS) == 0) {
		rc = wait_for_free_request(server, timeout, optype);
		if (rc)
			return rc;
		credits = 1;
	}

	mutex_lock(&server->srv_mutex);
	mid = server->ops->setup_async_request(server, rqst);
	if (IS_ERR(mid)) {
		mutex_unlock(&server->srv_mutex);
		add_credits_and_wake_if(server, credits, optype);
		return PTR_ERR(mid);
	}

	mid->receive = receive;
	mid->callback = callback;
	mid->callback_data = cbdata;
	mid->mid_state = MID_REQUEST_SUBMITTED;

	/* put it on the pending_mid_q */
	spin_lock(&GlobalMid_Lock);
	list_add_tail(&mid->qhead, &server->pending_mid_q);
	spin_unlock(&GlobalMid_Lock);


	cifs_in_send_inc(server);
	rc = smb_send_rqst(server, rqst);
	cifs_in_send_dec(server);
	cifs_save_when_sent(mid);

	if (rc < 0) {
		server->sequence_number -= 2;
		cifs_delete_mid(mid);
	}

	mutex_unlock(&server->srv_mutex);

	if (rc == 0)
		return 0;

	add_credits_and_wake_if(server, credits, optype);
	return rc;
}

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35.93%
4
28.57%
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sachin prabhu
29
10.74%
1
7.14%
rabin vincent
rabin vincent
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2.59%
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7.14%
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steve french
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2.22%
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/*
 *
 * 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];
	int resp_buf_type;

	iov[0].iov_base = in_buf;
	iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
	flags |= CIFS_NO_RESP;
	rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
	cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
steve french
steve french
87
92.55%
3
50.00%
joe perches
joe perches
5
5.32%
2
33.33%
pavel shilovsky
pavel shilovsky
2
2.13%
1
16.67%
Total
94
100.00%
6
100.00%


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(&GlobalMid_Lock);
	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		spin_unlock(&GlobalMid_Lock);
		return rc;
	case MID_RETRY_NEEDED:
		rc = -EAGAIN;
		break;
	case MID_RESPONSE_MALFORMED:
		rc = -EIO;
		break;
	case MID_SHUTDOWN:
		rc = -EHOSTDOWN;
		break;
	default:
		list_del_init(&mid->qhead);
		cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n",
			 __func__, mid->mid, mid->mid_state);
		rc = -EIO;
	}
	spin_unlock(&GlobalMid_Lock);

	mutex_lock(&server->srv_mutex);
	DeleteMidQEntry(mid);
	mutex_unlock(&server->srv_mutex);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff layton
jeff layton
131
82.39%
5
62.50%
christopher oo
christopher oo
16
10.06%
1
12.50%
pavel shilovsky
pavel shilovsky
6
3.77%
1
12.50%
joe perches
joe perches
6
3.77%
1
12.50%
Total
159
100.00%
8
100.00%


static inline int

send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid)
{
	return server->ops->send_cancel ?
				server->ops->send_cancel(server, buf, mid) : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff layton
jeff layton
43
100.00%
2
100.00%
Total
43
100.00%
2
100.00%


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;
		int rc = 0;
		struct smb_rqst rqst = { .rq_iov = &iov,
					 .rq_nvec = 1 };

		iov.iov_base = mid->resp_buf;
		iov.iov_len = len;
		/* FIXME: add code to kill session */
		rc = cifs_verify_signature(&rqst, server,
					   mid->sequence_number);
		if (rc)
			cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
				 rc);
	}

	/* BB special case reconnect tid and uid here? */
	return map_smb_to_linux_error(mid->resp_buf, log_error);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff layton
jeff layton
117
86.67%
4
50.00%
steve french
steve french
13
9.63%
1
12.50%
joe perches
joe perches
3
2.22%
1
12.50%
jeremy allison
jeremy allison
1
0.74%
1
12.50%
pavel shilovsky
pavel shilovsky
1
0.74%
1
12.50%
Total
135
100.00%
8
100.00%


struct mid_q_entry *

cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
{
	int rc;
	struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
	struct mid_q_entry *mid;

	rc = allocate_mid(ses, hdr, &mid);
	if (rc)
		return ERR_PTR(rc);
	rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number);
	if (rc) {
		cifs_delete_mid(mid);
		return ERR_PTR(rc);
	}
	return mid;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel shilovsky
pavel shilovsky
81
79.41%
2
66.67%
jeff layton
jeff layton
21
20.59%
1
33.33%
Total
102
100.00%
3
100.00%


int

SendReceive2(const unsigned int xid, struct cifs_ses *ses,
	     struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
	     const int flags)
{
	int rc = 0;
	int timeout, optype;
	struct mid_q_entry *midQ;
	char *buf = iov[0].iov_base;
	unsigned int credits = 1;
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = n_vec };

	timeout = flags & CIFS_TIMEOUT_MASK;
	optype = flags & CIFS_OP_MASK;

	*resp_buf_type = CIFS_NO_BUFFER;  /* no response buf yet */

	if ((ses == NULL) || (ses->server == NULL)) {
		cifs_small_buf_release(buf);
		cifs_dbg(VFS, "Null session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting) {
		cifs_small_buf_release(buf);
		return -ENOENT;
	}

	/*
         * 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.
         */

	rc = wait_for_free_request(ses->server, timeout, optype);
	if (rc) {
		cifs_small_buf_release(buf);
		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.
         */

	mutex_lock(&ses->server->srv_mutex);

	midQ = ses->server->ops->setup_request(ses, &rqst);
	if (IS_ERR(midQ)) {
		mutex_unlock(&ses->server->srv_mutex);
		cifs_small_buf_release(buf);
		/* Update # of requests on wire to server */
		add_credits(ses->server, 1, optype);
		return PTR_ERR(midQ);
	}

	midQ->mid_state = MID_REQUEST_SUBMITTED;
	cifs_in_send_inc(ses->server);
	rc = smb_sendv(ses->server, iov, n_vec);
	cifs_in_send_dec(ses->server);
	cifs_save_when_sent(midQ);

	if (rc < 0)
		ses->server->sequence_number -= 2;
	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0) {
		cifs_small_buf_release(buf);
		goto out;
	}

	if (timeout == CIFS_ASYNC_OP) {
		cifs_small_buf_release(buf);
		goto out;
	}

	rc = wait_for_response(ses->server, midQ);
	if (rc != 0) {
		send_cancel(ses->server, buf, midQ);
		spin_lock(&GlobalMid_Lock);
		if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
			midQ->callback = DeleteMidQEntry;
			spin_unlock(&GlobalMid_Lock);
			cifs_small_buf_release(buf);
			add_credits(ses->server, 1, optype);
			return rc;
		}
		spin_unlock(&GlobalMid_Lock);
	}

	cifs_small_buf_release(buf);

	rc = cifs_sync_mid_result(midQ, ses->server);
	if (rc != 0) {
		add_credits(ses->server, 1, optype);
		return rc;
	}

	if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) {
		rc = -EIO;
		cifs_dbg(FYI, "Bad MID state?\n");
		goto out;
	}

	buf = (char *)midQ->resp_buf;
	iov[0].iov_base = buf;
	iov[0].iov_len = get_rfc1002_length(buf) + 4;
	if (midQ->large_buf)
		*resp_buf_type = CIFS_LARGE_BUFFER;
	else
		*resp_buf_type = CIFS_SMALL_BUFFER;

	credits = ses->server->ops->get_credits(midQ);

	rc = ses->server->ops->check_receive(midQ, ses->server,
					     flags & CIFS_LOG_ERROR);

	/* mark it so buf will not be freed by cifs_delete_mid */
	if ((flags & CIFS_NO_RESP) == 0)
		midQ->resp_buf = NULL;
out:
	cifs_delete_mid(midQ);
	add_credits(ses->server, credits, optype);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeremy allison
jeremy allison
213
34.52%
1
3.33%
jeff layton
jeff layton
164
26.58%
12
40.00%
steve french
steve french
128
20.75%
8
26.67%
pavel shilovsky
pavel shilovsky
102
16.53%
7
23.33%
joe perches
joe perches
6
0.97%
1
3.33%
volker lendecke
volker lendecke
4
0.65%
1
3.33%
Total
617
100.00%
30
100.00%


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 timeout)
{
	int rc = 0;
	struct mid_q_entry *midQ;

	if (ses == NULL) {
		cifs_dbg(VFS, "Null smb session\n");
		return -EIO;
	}
	if (ses->server == NULL) {
		cifs_dbg(VFS, "Null tcp session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/* 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 (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
			MAX_CIFS_HDR_SIZE - 4) {
		cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
			 be32_to_cpu(in_buf->smb_buf_length));
		return -EIO;
	}

	rc = wait_for_free_request(ses->server, timeout, 0);
	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 */

	mutex_lock(&ses->server->srv_mutex);

	rc = allocate_mid(ses, in_buf, &midQ);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		/* Update # of requests on wire to server */
		add_credits(ses->server, 1, 0);
		return rc;
	}

	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		goto out;
	}

	midQ->mid_state = MID_REQUEST_SUBMITTED;

	cifs_in_send_inc(ses->server);
	rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
	cifs_in_send_dec(ses->server);
	cifs_save_when_sent(midQ);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0)
		goto out;

	if (timeout == CIFS_ASYNC_OP)
		goto out;

	rc = wait_for_response(ses->server, midQ);
	if (rc != 0) {
		send_cancel(ses->server, in_buf, midQ);
		spin_lock(&GlobalMid_Lock);
		if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
			/* no longer considered to be "in-flight" */
			midQ->callback = DeleteMidQEntry;
			spin_unlock(&GlobalMid_Lock);
			add_credits(ses->server, 1, 0);
			return rc;
		}
		spin_unlock(&GlobalMid_Lock);
	}

	rc = cifs_sync_mid_result(midQ, ses->server);
	if (rc != 0) {
		add_credits(ses->server, 1, 0);
		return rc;
	}

	if (!midQ->resp_buf || !out_buf ||
	    midQ->mid_state != MID_RESPONSE_RECEIVED) {
		rc = -EIO;
		cifs_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, ses->server, 0);
out:
	cifs_delete_mid(midQ);
	add_credits(ses->server, 1, 0);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
steve french
steve french
164
30.94%
10
31.25%
jeremy allison
jeremy allison
159
30.00%
1
3.12%
jeff layton
jeff layton
115
21.70%
10
31.25%
volker lendecke
volker lendecke
48
9.06%
3
9.38%
pavel shilovsky
pavel shilovsky
30
5.66%
6
18.75%
joe perches
joe perches
14
2.64%
2
6.25%
Total
530
100.00%
32
100.00%

/* 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeremy allison
jeremy allison
89
95.70%
1
25.00%
steve french
steve french
2
2.15%
1
25.00%
pavel shilovsky
pavel shilovsky
1
1.08%
1
25.00%
jeff layton
jeff layton
1
1.08%
1
25.00%
Total
93
100.00%
4
100.00%


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;

	if (tcon == NULL || tcon->ses == NULL) {
		cifs_dbg(VFS, "Null smb session\n");
		return -EIO;
	}
	ses = tcon->ses;

	if (ses->server == NULL) {
		cifs_dbg(VFS, "Null tcp session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/* 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 (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
			MAX_CIFS_HDR_SIZE - 4) {
		cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
			 be32_to_cpu(in_buf->smb_buf_length));
		return -EIO;
	}

	rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0);
	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 */

	mutex_lock(&ses->server->srv_mutex);

	rc = allocate_mid(ses, in_buf, &midQ);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		return rc;
	}

	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
	if (rc) {
		cifs_delete_mid(midQ);
		mutex_unlock(&ses->server->srv_mutex);
		return rc;
	}

	midQ->mid_state = MID_REQUEST_SUBMITTED;
	cifs_in_send_inc(ses->server);
	rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
	cifs_in_send_dec(ses->server);
	cifs_save_when_sent(midQ);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0) {
		cifs_delete_mid(midQ);
		return rc;
	}

	/* Wait for a reply - allow signals to interrupt. */
	rc = wait_event_interruptible(ses->server->response_q,
		(!(midQ->mid_state == MID_REQUEST_SUBMITTED)) ||
		((ses->server->tcpStatus != CifsGood) &&
		 (ses->server->tcpStatus != CifsNew)));

	/* Were we interrupted by a signal ? */
	if ((rc == -ERESTARTSYS) &&
		(midQ->mid_state == MID_REQUEST_SUBMITTED) &&
		((ses->server->tcpStatus == CifsGood) ||
		 (ses->server->tcpStatus == CifsNew))) {

		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(ses->server, in_buf, midQ);
			if (rc) {
				cifs_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) {
				cifs_delete_mid(midQ);
				return rc;
			}
		}

		rc = wait_for_response(ses->server, midQ);
		if (rc) {
			send_cancel(ses->server, in_buf, midQ);
			spin_lock(&GlobalMid_Lock);
			if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
				/* no longer considered to be "in-flight" */
				midQ->callback = DeleteMidQEntry;
				spin_unlock(&GlobalMid_Lock);
				return rc;
			}
			spin_unlock(&GlobalMid_Lock);
		}

		/* We got the response - restart system call. */
		rstart = 1;
	}

	rc = cifs_sync_mid_result(midQ, ses->server);
	if (rc != 0)
		return rc;

	/* rcvd frame is ok */
	if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) {
		rc = -EIO;
		cifs_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, ses->server, 0);
out:
	cifs_delete_mid(midQ);
	if (rstart && rc == -EACCES)
		return -ERESTARTSYS;
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
steve french
steve french
283
41.68%
14
38.89%
jeremy allison
jeremy allison
204
30.04%
1
2.78%
jeff layton
jeff layton
98
14.43%
11
30.56%
volker lendecke
volker lendecke
67
9.87%
4
11.11%
joe perches
joe perches
14
2.06%
2
5.56%
pavel shilovsky
pavel shilovsky
13
1.91%
4
11.11%
Total
679
100.00%
36
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff layton
jeff layton
1487
32.41%
35
33.02%
steve french
steve french
1369
29.84%
33
31.13%
jeremy allison
jeremy allison
722
15.74%
1
0.94%
pavel shilovsky
pavel shilovsky
551
12.01%
16
15.09%
al viro
al viro
132
2.88%
1
0.94%
volker lendecke
volker lendecke
122
2.66%
6
5.66%
joe perches
joe perches
76
1.66%
2
1.89%
shirish pargaonkar
shirish pargaonkar
57
1.24%
2
1.89%
sachin prabhu
sachin prabhu
35
0.76%
1
0.94%
christopher oo
christopher oo
16
0.35%
1
0.94%
rabin vincent
rabin vincent
7
0.15%
1
0.94%
tim gardner
tim gardner
3
0.07%
1
0.94%
tejun heo
tejun heo
3
0.07%
1
0.94%
christoph hellwig
christoph hellwig
3
0.07%
1
0.94%
andy shevchenko
andy shevchenko
2
0.04%
1
0.94%
christoph lameter
christoph lameter
1
0.02%
1
0.94%
colin cross
colin cross
1
0.02%
1
0.94%
linus torvalds
linus torvalds
1
0.02%
1
0.94%
Total
4588
100.00%
106
100.00%
Directory: fs/cifs

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