/*
* fs/cifs/transport.c
*
* Copyright (c) International Business Machines Corp., 2002
* 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/version.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
extern kmem_cache_t *cifs_mid_cachep;
extern kmem_cache_t *cifs_oplock_cachep;
struct mid_q_entry *
AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
{
struct mid_q_entry *temp;
int timeout = 10 * HZ;
/* BB add spinlock to protect midq for each session BB */
if (ses == NULL) {
cERROR(1, ("Null session passed in to AllocMidQEntry "));
return NULL;
}
temp = (struct mid_q_entry *) kmem_cache_alloc(cifs_mid_cachep,
SLAB_KERNEL);
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;
}
while ((ses->server->tcpStatus != CifsGood) && (timeout > 0)){
/* Give the tcp thread up to 10 seconds to reconnect */
/* Should we wake up tcp thread first? BB */
timeout = wait_event_interruptible_timeout(ses->server->response_q,
(ses->server->tcpStatus == CifsGood), timeout);
cFYI(1,("timeout (after reconnection wait) %d",timeout));
}
if (ses->server->tcpStatus == CifsGood) {
write_lock(&GlobalMid_Lock);
list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
atomic_inc(&midCount);
temp->midState = MID_REQUEST_ALLOCATED;
write_unlock(&GlobalMid_Lock);
} else {
cERROR(1,("Need to reconnect after session died to server"));
if (temp)
kmem_cache_free(cifs_mid_cachep, temp);
return NULL;
}
return temp;
}
void
DeleteMidQEntry(struct mid_q_entry *midEntry)
{
/* BB add spinlock to protect midq for each session BB */
write_lock(&GlobalMid_Lock);
midEntry->midState = MID_FREE;
list_del(&midEntry->qhead);
atomic_dec(&midCount);
write_unlock(&GlobalMid_Lock);
buf_release(midEntry->resp_buf);
kmem_cache_free(cifs_mid_cachep, midEntry);
}
struct oplock_q_entry *
AllocOplockQEntry(struct file * file, struct cifsTconInfo * tcon)
{
struct oplock_q_entry *temp;
if ((file == 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->file_to_flush = file;
temp->tcon = tcon;
write_lock(&GlobalMid_Lock);
list_add_tail(&temp->qhead, &GlobalOplock_Q);
write_unlock(&GlobalMid_Lock);
}
return temp;
}
void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
{
/* BB add spinlock to protect midq for each session BB */
write_lock(&GlobalMid_Lock);
/* should we check if list empty first? */
list_del(&oplockEntry->qhead);
write_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;
struct msghdr smb_msg;
struct iovec iov;
mm_segment_t temp_fs;
if(ssocket == NULL)
return -ENOTSOCK; /* BB eventually add reconnect code here */
/* ssocket->sk->allocation = GFP_BUFFER; *//* BB is this spurious? */
iov.iov_base = smb_buffer;
iov.iov_len = smb_buf_length + 4;
smb_msg.msg_name = sin;
smb_msg.msg_namelen = sizeof (struct sockaddr);
smb_msg.msg_iov = &iov;
smb_msg.msg_iovlen = 1;
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 */
if (smb_buf_length > 12)
smb_buffer->Flags2 = cpu_to_le16(smb_buffer->Flags2);
/* if(smb_buffer->Flags2 & SMBFLG2_SECURITY_SIGNATURE)
sign_smb(smb_buffer); */ /* BB enable when signing tested more */
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, smb_buf_length + 4);
temp_fs = get_fs(); /* we must turn off socket api parm checking */
set_fs(get_ds());
rc = sock_sendmsg(ssocket, &smb_msg, smb_buf_length + 4);
set_fs(temp_fs);
if (rc < 0) {
cERROR(1,
("Error %d sending data on socket to server.", rc));
} else
rc = 0;
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;
int receive_len;
long timeout;
struct mid_q_entry *midQ;
midQ = AllocMidQEntry(in_buf, ses);
if (midQ == NULL)
return -EIO;
if (in_buf->smb_buf_length > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1,
("Illegal length, greater than maximum frame, %d ",
in_buf->smb_buf_length));
DeleteMidQEntry(midQ);
return -EIO;
}
midQ->midState = MID_REQUEST_SUBMITTED;
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
(struct sockaddr *) &(ses->server->sockAddr));
if (long_op > 1) /* writes past end of file can take looooong time */
timeout = 300 * HZ;
else if (long_op == 1)
timeout = 60 * HZ;
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 */
timeout = wait_event_interruptible_timeout(ses->server->response_q,
midQ->
midState & MID_RESPONSE_RECEIVED,
timeout);
if (signal_pending(current)) {
cERROR(1, ("CIFS: caught signal"));
DeleteMidQEntry(midQ);
return -EINTR;
} else {
if (midQ->resp_buf)
receive_len =
be32_to_cpu(midQ->resp_buf->smb_buf_length);
else {
DeleteMidQEntry(midQ);
return -EIO;
}
}
if (timeout == 0) {
cFYI(1,
("Timeout on receive. Assume response SMB is invalid."));
rc = -ETIMEDOUT;
} else if (receive_len > CIFS_MAX_MSGSIZE + 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)) {
memcpy(out_buf, midQ->resp_buf,
receive_len +
4 /* include 4 byte RFC1001 header */ );
/* convert the length back to a form that we can use */
dump_smb(out_buf, 92);
out_buf->smb_buf_length =
be32_to_cpu(out_buf->smb_buf_length);
if (out_buf->smb_buf_length > 12)
out_buf->Flags2 = le16_to_cpu(out_buf->Flags2);
if (out_buf->smb_buf_length > 28)
out_buf->Pid = le16_to_cpu(out_buf->Pid);
if (out_buf->smb_buf_length > 28)
out_buf->PidHigh =
le16_to_cpu(out_buf->PidHigh);
*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;
}
DeleteMidQEntry(midQ); /* BB what if process is killed?
- BB add background daemon to clean up Mid entries from
killed processes & test killing process with active mid */
return rc;
}