mirror of
https://github.com/torvalds/linux.git
synced 2024-11-06 03:51:48 +00:00
5da07b0208
Although harmless, we were sometimes treating midState like it contained flags but they are exclusive states, and this makes that more clear. Signed-off-by: Jeremy Allison <jra@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com> (cherry picked from 586c057c3a68dd6ae0f3ba94fbf76798b1558074 commit)
885 lines
24 KiB
C
885 lines
24 KiB
C
/*
|
|
* fs/cifs/transport.c
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2002,2005
|
|
* 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/wait.h>
|
|
#include <linux/net.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/processor.h>
|
|
#include <linux/mempool.h>
|
|
#include "cifspdu.h"
|
|
#include "cifsglob.h"
|
|
#include "cifsproto.h"
|
|
#include "cifs_debug.h"
|
|
|
|
extern mempool_t *cifs_mid_poolp;
|
|
extern kmem_cache_t *cifs_oplock_cachep;
|
|
|
|
static struct mid_q_entry *
|
|
AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
|
|
{
|
|
struct mid_q_entry *temp;
|
|
|
|
if (ses == NULL) {
|
|
cERROR(1, ("Null session passed in to AllocMidQEntry"));
|
|
return NULL;
|
|
}
|
|
if (ses->server == NULL) {
|
|
cERROR(1, ("Null TCP session in AllocMidQEntry"));
|
|
return NULL;
|
|
}
|
|
|
|
temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,
|
|
SLAB_KERNEL | SLAB_NOFS);
|
|
if (temp == NULL)
|
|
return temp;
|
|
else {
|
|
memset(temp, 0, sizeof (struct mid_q_entry));
|
|
temp->mid = smb_buffer->Mid; /* always LE */
|
|
temp->pid = current->pid;
|
|
temp->command = smb_buffer->Command;
|
|
cFYI(1, ("For smb_command %d", temp->command));
|
|
/* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
|
|
/* when mid allocated can be before when sent */
|
|
temp->when_alloc = jiffies;
|
|
temp->ses = ses;
|
|
temp->tsk = current;
|
|
}
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
|
|
atomic_inc(&midCount);
|
|
temp->midState = MID_REQUEST_ALLOCATED;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return temp;
|
|
}
|
|
|
|
static void
|
|
DeleteMidQEntry(struct mid_q_entry *midEntry)
|
|
{
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
unsigned long now;
|
|
#endif
|
|
spin_lock(&GlobalMid_Lock);
|
|
midEntry->midState = MID_FREE;
|
|
list_del(&midEntry->qhead);
|
|
atomic_dec(&midCount);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
if(midEntry->largeBuf)
|
|
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 != SMB_COM_LOCKING_ANDX)) {
|
|
printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d",
|
|
midEntry->command, midEntry->mid);
|
|
printk(" 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);
|
|
}
|
|
|
|
struct oplock_q_entry *
|
|
AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon)
|
|
{
|
|
struct oplock_q_entry *temp;
|
|
if ((pinode== NULL) || (tcon == NULL)) {
|
|
cERROR(1, ("Null parms passed to AllocOplockQEntry"));
|
|
return NULL;
|
|
}
|
|
temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
|
|
SLAB_KERNEL);
|
|
if (temp == NULL)
|
|
return temp;
|
|
else {
|
|
temp->pinode = pinode;
|
|
temp->tcon = tcon;
|
|
temp->netfid = fid;
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_add_tail(&temp->qhead, &GlobalOplock_Q);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
return temp;
|
|
|
|
}
|
|
|
|
void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
|
|
{
|
|
spin_lock(&GlobalMid_Lock);
|
|
/* should we check if list empty first? */
|
|
list_del(&oplockEntry->qhead);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
kmem_cache_free(cifs_oplock_cachep, oplockEntry);
|
|
}
|
|
|
|
int
|
|
smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
|
|
unsigned int smb_buf_length, struct sockaddr *sin)
|
|
{
|
|
int rc = 0;
|
|
int i = 0;
|
|
struct msghdr smb_msg;
|
|
struct kvec iov;
|
|
unsigned len = smb_buf_length + 4;
|
|
|
|
if(ssocket == NULL)
|
|
return -ENOTSOCK; /* BB eventually add reconnect code here */
|
|
iov.iov_base = smb_buffer;
|
|
iov.iov_len = len;
|
|
|
|
smb_msg.msg_name = sin;
|
|
smb_msg.msg_namelen = sizeof (struct sockaddr);
|
|
smb_msg.msg_control = NULL;
|
|
smb_msg.msg_controllen = 0;
|
|
smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
|
|
|
|
/* smb header is converted in header_assemble. bcc and rest of SMB word
|
|
area, and byte area if necessary, is converted to littleendian in
|
|
cifssmb.c and RFC1001 len is converted to bigendian in smb_send
|
|
Flags2 is converted in SendReceive */
|
|
|
|
smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
|
|
cFYI(1, ("Sending smb of length %d", smb_buf_length));
|
|
dump_smb(smb_buffer, len);
|
|
|
|
while (len > 0) {
|
|
rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
|
|
if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
|
|
i++;
|
|
/* smaller timeout here than send2 since smaller size */
|
|
/* Although it may not be required, this also is smaller
|
|
oplock break time */
|
|
if(i > 12) {
|
|
cERROR(1,
|
|
("sends on sock %p stuck for 7 seconds",
|
|
ssocket));
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
msleep(1 << i);
|
|
continue;
|
|
}
|
|
if (rc < 0)
|
|
break;
|
|
else
|
|
i = 0; /* reset i after each successful send */
|
|
iov.iov_base += rc;
|
|
iov.iov_len -= rc;
|
|
len -= rc;
|
|
}
|
|
|
|
if (rc < 0) {
|
|
cERROR(1,("Error %d sending data on socket to server", rc));
|
|
} else {
|
|
rc = 0;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
|
|
struct sockaddr *sin)
|
|
{
|
|
int rc = 0;
|
|
int i = 0;
|
|
struct msghdr smb_msg;
|
|
struct smb_hdr *smb_buffer = iov[0].iov_base;
|
|
unsigned int len = iov[0].iov_len;
|
|
unsigned int total_len;
|
|
int first_vec = 0;
|
|
|
|
if(ssocket == NULL)
|
|
return -ENOTSOCK; /* BB eventually add reconnect code here */
|
|
|
|
smb_msg.msg_name = sin;
|
|
smb_msg.msg_namelen = sizeof (struct sockaddr);
|
|
smb_msg.msg_control = NULL;
|
|
smb_msg.msg_controllen = 0;
|
|
smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
|
|
|
|
/* smb header is converted in header_assemble. bcc and rest of SMB word
|
|
area, and byte area if necessary, is converted to littleendian in
|
|
cifssmb.c and RFC1001 len is converted to bigendian in smb_send
|
|
Flags2 is converted in SendReceive */
|
|
|
|
|
|
total_len = 0;
|
|
for (i = 0; i < n_vec; i++)
|
|
total_len += iov[i].iov_len;
|
|
|
|
smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
|
|
cFYI(1, ("Sending smb: total_len %d", total_len));
|
|
dump_smb(smb_buffer, len);
|
|
|
|
while (total_len) {
|
|
rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
|
|
n_vec - first_vec, total_len);
|
|
if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
|
|
i++;
|
|
if(i >= 14) {
|
|
cERROR(1,
|
|
("sends on sock %p stuck for 15 seconds",
|
|
ssocket));
|
|
rc = -EAGAIN;
|
|
break;
|
|
}
|
|
msleep(1 << i);
|
|
continue;
|
|
}
|
|
if (rc < 0)
|
|
break;
|
|
|
|
if (rc >= total_len) {
|
|
WARN_ON(rc > total_len);
|
|
break;
|
|
}
|
|
if(rc == 0) {
|
|
/* should never happen, letting socket clear before
|
|
retrying is our only obvious option here */
|
|
cERROR(1,("tcp sent no data"));
|
|
msleep(500);
|
|
continue;
|
|
}
|
|
total_len -= rc;
|
|
/* the line below resets i */
|
|
for (i = first_vec; i < n_vec; i++) {
|
|
if (iov[i].iov_len) {
|
|
if (rc > iov[i].iov_len) {
|
|
rc -= iov[i].iov_len;
|
|
iov[i].iov_len = 0;
|
|
} else {
|
|
iov[i].iov_base += rc;
|
|
iov[i].iov_len -= rc;
|
|
first_vec = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
i = 0; /* in case we get ENOSPC on the next send */
|
|
}
|
|
|
|
if (rc < 0) {
|
|
cERROR(1,("Error %d sending data on socket to server", rc));
|
|
} else
|
|
rc = 0;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
|
|
struct kvec *iov, int n_vec, int * pRespBufType /* ret */,
|
|
const int long_op)
|
|
{
|
|
int rc = 0;
|
|
unsigned int receive_len;
|
|
unsigned long timeout;
|
|
struct mid_q_entry *midQ;
|
|
struct smb_hdr *in_buf = iov[0].iov_base;
|
|
|
|
*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
|
|
|
|
if ((ses == NULL) || (ses->server == NULL)) {
|
|
cifs_small_buf_release(in_buf);
|
|
cERROR(1,("Null session"));
|
|
return -EIO;
|
|
}
|
|
|
|
if(ses->server->tcpStatus == CifsExiting) {
|
|
cifs_small_buf_release(in_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 */
|
|
if(long_op == -1) {
|
|
/* oplock breaks must not be held up */
|
|
atomic_inc(&ses->server->inFlight);
|
|
} else {
|
|
spin_lock(&GlobalMid_Lock);
|
|
while(1) {
|
|
if(atomic_read(&ses->server->inFlight) >=
|
|
cifs_max_pending){
|
|
spin_unlock(&GlobalMid_Lock);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->num_waiters);
|
|
#endif
|
|
wait_event(ses->server->request_q,
|
|
atomic_read(&ses->server->inFlight)
|
|
< cifs_max_pending);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->num_waiters);
|
|
#endif
|
|
spin_lock(&GlobalMid_Lock);
|
|
} else {
|
|
if(ses->server->tcpStatus == CifsExiting) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
cifs_small_buf_release(in_buf);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* can not count locking commands against total since
|
|
they are allowed to block on server */
|
|
|
|
if(long_op < 3) {
|
|
/* update # of requests on the wire to server */
|
|
atomic_inc(&ses->server->inFlight);
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* 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 */
|
|
|
|
down(&ses->server->tcpSem);
|
|
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
|
rc = -ENOENT;
|
|
goto out_unlock2;
|
|
} else if (ses->server->tcpStatus == CifsNeedReconnect) {
|
|
cFYI(1,("tcp session dead - return to caller to retry"));
|
|
rc = -EAGAIN;
|
|
goto out_unlock2;
|
|
} else if (ses->status != CifsGood) {
|
|
/* check if SMB session is bad because we are setting it up */
|
|
if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
|
|
(in_buf->Command != SMB_COM_NEGOTIATE)) {
|
|
rc = -EAGAIN;
|
|
goto out_unlock2;
|
|
} /* else ok - we are setting up session */
|
|
}
|
|
midQ = AllocMidQEntry(in_buf, ses);
|
|
if (midQ == NULL) {
|
|
up(&ses->server->tcpSem);
|
|
cifs_small_buf_release(in_buf);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
|
|
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->inSend);
|
|
#endif
|
|
rc = smb_send2(ses->server->ssocket, iov, n_vec,
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->inSend);
|
|
midQ->when_sent = jiffies;
|
|
#endif
|
|
if(rc < 0) {
|
|
DeleteMidQEntry(midQ);
|
|
up(&ses->server->tcpSem);
|
|
cifs_small_buf_release(in_buf);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return rc;
|
|
} else {
|
|
up(&ses->server->tcpSem);
|
|
cifs_small_buf_release(in_buf);
|
|
}
|
|
|
|
if (long_op == -1)
|
|
goto cifs_no_response_exit2;
|
|
else if (long_op == 2) /* writes past end of file can take loong time */
|
|
timeout = 180 * HZ;
|
|
else if (long_op == 1)
|
|
timeout = 45 * HZ; /* should be greater than
|
|
servers oplock break timeout (about 43 seconds) */
|
|
else if (long_op > 2) {
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
} else
|
|
timeout = 15 * HZ;
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
|
due to last connection to this server being unmounted */
|
|
if (signal_pending(current)) {
|
|
/* if signal pending do not hold up user for full smb timeout
|
|
but we still give response a change to complete */
|
|
timeout = 2 * HZ;
|
|
}
|
|
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
|
if(timeout != MAX_SCHEDULE_TIMEOUT) {
|
|
unsigned long curr_timeout;
|
|
|
|
for (;;) {
|
|
curr_timeout = timeout + jiffies;
|
|
wait_event(ses->server->response_q,
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
|
time_after(jiffies, curr_timeout) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
|
|
if (time_after(jiffies, curr_timeout) &&
|
|
(midQ->midState == MID_REQUEST_SUBMITTED) &&
|
|
((ses->server->tcpStatus == CifsGood) ||
|
|
(ses->server->tcpStatus == CifsNew))) {
|
|
|
|
unsigned long lrt;
|
|
|
|
/* We timed out. Is the server still
|
|
sending replies ? */
|
|
spin_lock(&GlobalMid_Lock);
|
|
lrt = ses->server->lstrp;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
/* Calculate 10 seconds past last receive time.
|
|
Although we prefer not to time out if the
|
|
server is still responding - we will time
|
|
out if the server takes more than 15 (or 45
|
|
or 180) seconds to respond to this request
|
|
and has not responded to any request from
|
|
other threads on the client within 10 seconds */
|
|
lrt += (10 * HZ);
|
|
if (time_after(jiffies, lrt)) {
|
|
/* No replies for 10 seconds. */
|
|
cERROR(1,("server not responding"));
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
wait_event(ses->server->response_q,
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
}
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->resp_buf) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
} else {
|
|
cERROR(1,("No response to cmd %d mid %d",
|
|
midQ->command, midQ->mid));
|
|
if(midQ->midState == MID_REQUEST_SUBMITTED) {
|
|
if(ses->server->tcpStatus == CifsExiting)
|
|
rc = -EHOSTDOWN;
|
|
else {
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
|
midQ->midState = MID_RETRY_NEEDED;
|
|
}
|
|
}
|
|
|
|
if (rc != -EHOSTDOWN) {
|
|
if(midQ->midState == MID_RETRY_NEEDED) {
|
|
rc = -EAGAIN;
|
|
cFYI(1,("marking request for retry"));
|
|
} else {
|
|
rc = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteMidQEntry(midQ);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid));
|
|
rc = -EIO;
|
|
} else { /* rcvd frame is ok */
|
|
if (midQ->resp_buf &&
|
|
(midQ->midState == MID_RESPONSE_RECEIVED)) {
|
|
|
|
iov[0].iov_base = (char *)midQ->resp_buf;
|
|
if(midQ->largeBuf)
|
|
*pRespBufType = CIFS_LARGE_BUFFER;
|
|
else
|
|
*pRespBufType = CIFS_SMALL_BUFFER;
|
|
iov[0].iov_len = receive_len + 4;
|
|
|
|
dump_smb(midQ->resp_buf, 80);
|
|
/* convert the length into a more usable form */
|
|
if((receive_len > 24) &&
|
|
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
|
|
SECMODE_SIGN_ENABLED))) {
|
|
rc = cifs_verify_signature(midQ->resp_buf,
|
|
ses->server->mac_signing_key,
|
|
midQ->sequence_number+1);
|
|
if(rc) {
|
|
cERROR(1,("Unexpected SMB signature"));
|
|
/* BB FIXME add code to kill session */
|
|
}
|
|
}
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
/* BB special case Errbadpassword and pwdexpired here */
|
|
rc = map_smb_to_linux_error(midQ->resp_buf);
|
|
|
|
/* convert ByteCount if necessary */
|
|
if (receive_len >=
|
|
sizeof (struct smb_hdr) -
|
|
4 /* do not count RFC1001 header */ +
|
|
(2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
|
|
BCC(midQ->resp_buf) =
|
|
le16_to_cpu(BCC_LE(midQ->resp_buf));
|
|
midQ->resp_buf = NULL; /* mark it so will not be freed
|
|
by DeleteMidQEntry */
|
|
} else {
|
|
rc = -EIO;
|
|
cFYI(1,("Bad MID state?"));
|
|
}
|
|
}
|
|
cifs_no_response_exit2:
|
|
DeleteMidQEntry(midQ);
|
|
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_unlock2:
|
|
up(&ses->server->tcpSem);
|
|
cifs_small_buf_release(in_buf);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned, const int long_op)
|
|
{
|
|
int rc = 0;
|
|
unsigned int receive_len;
|
|
unsigned long timeout;
|
|
struct mid_q_entry *midQ;
|
|
|
|
if (ses == NULL) {
|
|
cERROR(1,("Null smb session"));
|
|
return -EIO;
|
|
}
|
|
if(ses->server == NULL) {
|
|
cERROR(1,("Null tcp session"));
|
|
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(long_op == -1) {
|
|
/* oplock breaks must not be held up */
|
|
atomic_inc(&ses->server->inFlight);
|
|
} else {
|
|
spin_lock(&GlobalMid_Lock);
|
|
while(1) {
|
|
if(atomic_read(&ses->server->inFlight) >=
|
|
cifs_max_pending){
|
|
spin_unlock(&GlobalMid_Lock);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->num_waiters);
|
|
#endif
|
|
wait_event(ses->server->request_q,
|
|
atomic_read(&ses->server->inFlight)
|
|
< cifs_max_pending);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->num_waiters);
|
|
#endif
|
|
spin_lock(&GlobalMid_Lock);
|
|
} else {
|
|
if(ses->server->tcpStatus == CifsExiting) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* can not count locking commands against total since
|
|
they are allowed to block on server */
|
|
|
|
if(long_op < 3) {
|
|
/* update # of requests on the wire to server */
|
|
atomic_inc(&ses->server->inFlight);
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* 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 */
|
|
|
|
down(&ses->server->tcpSem);
|
|
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
|
rc = -ENOENT;
|
|
goto out_unlock;
|
|
} else if (ses->server->tcpStatus == CifsNeedReconnect) {
|
|
cFYI(1,("tcp session dead - return to caller to retry"));
|
|
rc = -EAGAIN;
|
|
goto out_unlock;
|
|
} else if (ses->status != CifsGood) {
|
|
/* check if SMB session is bad because we are setting it up */
|
|
if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
|
|
(in_buf->Command != SMB_COM_NEGOTIATE)) {
|
|
rc = -EAGAIN;
|
|
goto out_unlock;
|
|
} /* else ok - we are setting up session */
|
|
}
|
|
midQ = AllocMidQEntry(in_buf, ses);
|
|
if (midQ == NULL) {
|
|
up(&ses->server->tcpSem);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
up(&ses->server->tcpSem);
|
|
cERROR(1, ("Illegal length, greater than maximum frame, %d",
|
|
in_buf->smb_buf_length));
|
|
DeleteMidQEntry(midQ);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->inSend);
|
|
#endif
|
|
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->inSend);
|
|
midQ->when_sent = jiffies;
|
|
#endif
|
|
if(rc < 0) {
|
|
DeleteMidQEntry(midQ);
|
|
up(&ses->server->tcpSem);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return rc;
|
|
} else
|
|
up(&ses->server->tcpSem);
|
|
if (long_op == -1)
|
|
goto cifs_no_response_exit;
|
|
else if (long_op == 2) /* writes past end of file can take loong time */
|
|
timeout = 180 * HZ;
|
|
else if (long_op == 1)
|
|
timeout = 45 * HZ; /* should be greater than
|
|
servers oplock break timeout (about 43 seconds) */
|
|
else if (long_op > 2) {
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
} else
|
|
timeout = 15 * HZ;
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
|
due to last connection to this server being unmounted */
|
|
if (signal_pending(current)) {
|
|
/* if signal pending do not hold up user for full smb timeout
|
|
but we still give response a change to complete */
|
|
timeout = 2 * HZ;
|
|
}
|
|
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
|
if(timeout != MAX_SCHEDULE_TIMEOUT) {
|
|
unsigned long curr_timeout;
|
|
|
|
for (;;) {
|
|
curr_timeout = timeout + jiffies;
|
|
wait_event(ses->server->response_q,
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
|
time_after(jiffies, curr_timeout) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
|
|
if (time_after(jiffies, curr_timeout) &&
|
|
(midQ->midState == MID_REQUEST_SUBMITTED) &&
|
|
((ses->server->tcpStatus == CifsGood) ||
|
|
(ses->server->tcpStatus == CifsNew))) {
|
|
|
|
unsigned long lrt;
|
|
|
|
/* We timed out. Is the server still
|
|
sending replies ? */
|
|
spin_lock(&GlobalMid_Lock);
|
|
lrt = ses->server->lstrp;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
/* Calculate 10 seconds past last receive time*/
|
|
lrt += (10 * HZ);
|
|
if (time_after(jiffies, lrt)) {
|
|
/* Server sent no reply in 10 seconds */
|
|
cERROR(1,("Server not responding"));
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
wait_event(ses->server->response_q,
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
}
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->resp_buf) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
} else {
|
|
cERROR(1,("No response for cmd %d mid %d",
|
|
midQ->command, midQ->mid));
|
|
if(midQ->midState == MID_REQUEST_SUBMITTED) {
|
|
if(ses->server->tcpStatus == CifsExiting)
|
|
rc = -EHOSTDOWN;
|
|
else {
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
|
midQ->midState = MID_RETRY_NEEDED;
|
|
}
|
|
}
|
|
|
|
if (rc != -EHOSTDOWN) {
|
|
if(midQ->midState == MID_RETRY_NEEDED) {
|
|
rc = -EAGAIN;
|
|
cFYI(1,("marking request for retry"));
|
|
} else {
|
|
rc = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteMidQEntry(midQ);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid));
|
|
rc = -EIO;
|
|
} else { /* rcvd frame is ok */
|
|
|
|
if (midQ->resp_buf && out_buf
|
|
&& (midQ->midState == MID_RESPONSE_RECEIVED)) {
|
|
out_buf->smb_buf_length = receive_len;
|
|
memcpy((char *)out_buf + 4,
|
|
(char *)midQ->resp_buf + 4,
|
|
receive_len);
|
|
|
|
dump_smb(out_buf, 92);
|
|
/* convert the length into a more usable form */
|
|
if((receive_len > 24) &&
|
|
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
|
|
SECMODE_SIGN_ENABLED))) {
|
|
rc = cifs_verify_signature(out_buf,
|
|
ses->server->mac_signing_key,
|
|
midQ->sequence_number+1);
|
|
if(rc) {
|
|
cERROR(1,("Unexpected SMB signature"));
|
|
/* BB FIXME add code to kill session */
|
|
}
|
|
}
|
|
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
rc = map_smb_to_linux_error(out_buf);
|
|
|
|
/* convert ByteCount if necessary */
|
|
if (receive_len >=
|
|
sizeof (struct smb_hdr) -
|
|
4 /* do not count RFC1001 header */ +
|
|
(2 * out_buf->WordCount) + 2 /* bcc */ )
|
|
BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
|
|
} else {
|
|
rc = -EIO;
|
|
cERROR(1,("Bad MID state?"));
|
|
}
|
|
}
|
|
cifs_no_response_exit:
|
|
DeleteMidQEntry(midQ);
|
|
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
|
|
return rc;
|
|
|
|
out_unlock:
|
|
up(&ses->server->tcpSem);
|
|
/* If not lock req, update # of requests on wire to server */
|
|
if(long_op < 3) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
}
|
|
|
|
return rc;
|
|
}
|