620 lines
17 KiB
C
620 lines
17 KiB
C
|
/*
|
||
|
|
* fs/cifs/transport.c
|
||
|
|
*
|
||
|
|
* Copyright (C) International Business Machines Corp., 2002,2004
|
||
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
||
|
|
*
|
||
|
|
* 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);
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
spin_lock(&GlobalMid_Lock);
|
||
|
|
midEntry->midState = MID_FREE;
|
||
|
|
list_del(&midEntry->qhead);
|
||
|
|
atomic_dec(&midCount);
|
||
|
|
spin_unlock(&GlobalMid_Lock);
|
||
|
|
cifs_buf_release(midEntry->resp_buf);
|
||
|
|
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++;
|
||
|
|
if(i > 60) {
|
||
|
|
cERROR(1,
|
||
|
|
("sends on sock %p stuck for 30 seconds",
|
||
|
|
ssocket));
|
||
|
|
rc = -EAGAIN;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
msleep(500);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (rc < 0)
|
||
|
|
break;
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CIFS_EXPERIMENTAL
|
||
|
|
/* BB finish off this function, adding support for writing set of pages as iovec */
|
||
|
|
/* and also adding support for operations that need to parse the response smb */
|
||
|
|
|
||
|
|
int
|
||
|
|
smb_sendv(struct socket *ssocket, struct smb_hdr *smb_buffer,
|
||
|
|
unsigned int smb_buf_length, struct kvec * write_vector /* page list */, struct sockaddr *sin)
|
||
|
|
{
|
||
|
|
int rc = 0;
|
||
|
|
int i = 0;
|
||
|
|
struct msghdr smb_msg;
|
||
|
|
number_of_pages += 1; /* account for SMB header */
|
||
|
|
struct kvec * piov = kmalloc(number_of_pages * sizeof(struct kvec));
|
||
|
|
if(i=0;i<num_pages-1;i++
|
||
|
|
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, number_of_pages, len?);
|
||
|
|
if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
|
||
|
|
i++;
|
||
|
|
if(i > 60) {
|
||
|
|
cERROR(1,
|
||
|
|
("sends on sock %p stuck for 30 seconds",
|
||
|
|
ssocket));
|
||
|
|
rc = -EAGAIN;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
msleep(500);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (rc < 0)
|
||
|
|
break;
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int
|
||
|
|
CIFSSendRcv(const unsigned int xid, struct cifsSesInfo *ses,
|
||
|
|
struct smb_hdr *in_buf, struct kvec * write_vector /* page list */, int *pbytes_returned, const int long_op)
|
||
|
|
{
|
||
|
|
int rc = 0;
|
||
|
|
unsigned long timeout = 15 * HZ;
|
||
|
|
struct mid_q_entry *midQ = NULL;
|
||
|
|
|
||
|
|
if (ses == NULL) {
|
||
|
|
cERROR(1,("Null smb session"));
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
if(ses->server == NULL) {
|
||
|
|
cERROR(1,("Null tcp session"));
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
if(pbytes_returned == NULL)
|
||
|
|
return -EIO;
|
||
|
|
else
|
||
|
|
*pbytes_returned = 0;
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
wait_event(ses->server->request_q,
|
||
|
|
atomic_read(&ses->server->inFlight)
|
||
|
|
< cifs_max_pending);
|
||
|
|
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 cifs_out_label;
|
||
|
|
} else if (ses->server->tcpStatus == CifsNeedReconnect) {
|
||
|
|
cFYI(1,("tcp session dead - return to caller to retry"));
|
||
|
|
rc = -EAGAIN;
|
||
|
|
goto cifs_out_label;
|
||
|
|
} 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 cifs_out_label;
|
||
|
|
} /* 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* BB can we sign efficiently in this path? */
|
||
|
|
rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
|
||
|
|
|
||
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
||
|
|
/* rc = smb_sendv(ses->server->ssocket, in_buf, in_buf->smb_buf_length, piovec,
|
||
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));*/
|
||
|
|
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);
|
||
|
|
cifs_out_label:
|
||
|
|
if(midQ)
|
||
|
|
DeleteMidQEntry(midQ);
|
||
|
|
|
||
|
|
if(long_op < 3) {
|
||
|
|
atomic_dec(&ses->server->inFlight);
|
||
|
|
wake_up(&ses->server->request_q);
|
||
|
|
}
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* CIFS_EXPERIMENTAL */
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
wait_event(ses->server->request_q,
|
||
|
|
atomic_read(&ses->server->inFlight)
|
||
|
|
< cifs_max_pending);
|
||
|
|
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, &midQ->sequence_number);
|
||
|
|
|
||
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
||
|
|
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
|
||
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
||
|
|
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 looooong time */
|
||
|
|
timeout = 300 * 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) {
|
||
|
|
timeout += jiffies;
|
||
|
|
wait_event(ses->server->response_q,
|
||
|
|
(!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
|
||
|
|
time_after(jiffies, timeout) ||
|
||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
||
|
|
(ses->server->tcpStatus != CifsNew)));
|
||
|
|
} 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 = be32_to_cpu(*(__be32 *)midQ->resp_buf);
|
||
|
|
} else {
|
||
|
|
cERROR(1,("No response buffer"));
|
||
|
|
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->mac_signing_key,midQ->sequence_number); /* BB fix BB */
|
||
|
|
if(rc)
|
||
|
|
cFYI(1,("Unexpected signature received from server"));
|
||
|
|
}
|
||
|
|
|
||
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
||
|
|
|
||
|
|
/* BB special case reconnect tid and reconnect 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(out_buf));
|
||
|
|
} else {
|
||
|
|
rc = -EIO;
|
||
|
|
cFYI(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;
|
||
|
|
}
|