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xianfeng |
/*
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* fs/cifs/transport.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org) 2006.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/net.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <linux/mempool.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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extern mempool_t *cifs_mid_poolp;
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extern struct kmem_cache *cifs_oplock_cachep;
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static struct mid_q_entry *
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AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
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{
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struct mid_q_entry *temp;
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if (ses == NULL) {
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cERROR(1, ("Null session passed in to AllocMidQEntry"));
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return NULL;
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}
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if (ses->server == NULL) {
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cERROR(1, ("Null TCP session in AllocMidQEntry"));
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return NULL;
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}
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temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,
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GFP_KERNEL | GFP_NOFS);
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if (temp == NULL)
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return temp;
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else {
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memset(temp, 0, sizeof(struct mid_q_entry));
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temp->mid = smb_buffer->Mid; /* always LE */
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temp->pid = current->pid;
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temp->command = smb_buffer->Command;
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cFYI(1, ("For smb_command %d", temp->command));
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/* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
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/* when mid allocated can be before when sent */
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temp->when_alloc = jiffies;
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temp->ses = ses;
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temp->tsk = current;
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}
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
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atomic_inc(&midCount);
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temp->midState = MID_REQUEST_ALLOCATED;
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spin_unlock(&GlobalMid_Lock);
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return temp;
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}
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static void
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DeleteMidQEntry(struct mid_q_entry *midEntry)
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{
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#ifdef CONFIG_CIFS_STATS2
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unsigned long now;
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#endif
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spin_lock(&GlobalMid_Lock);
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midEntry->midState = MID_FREE;
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list_del(&midEntry->qhead);
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atomic_dec(&midCount);
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spin_unlock(&GlobalMid_Lock);
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if (midEntry->largeBuf)
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cifs_buf_release(midEntry->resp_buf);
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else
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cifs_small_buf_release(midEntry->resp_buf);
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#ifdef CONFIG_CIFS_STATS2
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now = jiffies;
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/* commands taking longer than one second are indications that
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something is wrong, unless it is quite a slow link or server */
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if ((now - midEntry->when_alloc) > HZ) {
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if ((cifsFYI & CIFS_TIMER) &&
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(midEntry->command != SMB_COM_LOCKING_ANDX)) {
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printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d",
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midEntry->command, midEntry->mid);
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printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
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now - midEntry->when_alloc,
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now - midEntry->when_sent,
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now - midEntry->when_received);
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}
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}
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#endif
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mempool_free(midEntry, cifs_mid_poolp);
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}
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struct oplock_q_entry *
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AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon)
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{
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struct oplock_q_entry *temp;
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if ((pinode == NULL) || (tcon == NULL)) {
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cERROR(1, ("Null parms passed to AllocOplockQEntry"));
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return NULL;
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}
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temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
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GFP_KERNEL);
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if (temp == NULL)
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return temp;
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else {
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temp->pinode = pinode;
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temp->tcon = tcon;
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temp->netfid = fid;
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&temp->qhead, &GlobalOplock_Q);
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spin_unlock(&GlobalMid_Lock);
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}
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return temp;
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}
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void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry)
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{
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spin_lock(&GlobalMid_Lock);
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/* should we check if list empty first? */
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list_del(&oplockEntry->qhead);
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spin_unlock(&GlobalMid_Lock);
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kmem_cache_free(cifs_oplock_cachep, oplockEntry);
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}
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int
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smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
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unsigned int smb_buf_length, struct sockaddr *sin)
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{
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int rc = 0;
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int i = 0;
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struct msghdr smb_msg;
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struct kvec iov;
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unsigned len = smb_buf_length + 4;
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if (ssocket == NULL)
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return -ENOTSOCK; /* BB eventually add reconnect code here */
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iov.iov_base = smb_buffer;
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iov.iov_len = len;
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smb_msg.msg_name = sin;
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smb_msg.msg_namelen = sizeof(struct sockaddr);
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smb_msg.msg_control = NULL;
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smb_msg.msg_controllen = 0;
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smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
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/* smb header is converted in header_assemble. bcc and rest of SMB word
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area, and byte area if necessary, is converted to littleendian in
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cifssmb.c and RFC1001 len is converted to bigendian in smb_send
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Flags2 is converted in SendReceive */
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smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
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cFYI(1, ("Sending smb of length %d", smb_buf_length));
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dump_smb(smb_buffer, len);
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while (len > 0) {
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rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
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if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
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i++;
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/* smaller timeout here than send2 since smaller size */
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/* Although it may not be required, this also is smaller
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oplock break time */
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if (i > 12) {
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cERROR(1,
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("sends on sock %p stuck for 7 seconds",
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ssocket));
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rc = -EAGAIN;
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break;
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| 188 |
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}
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| 189 |
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msleep(1 << i);
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continue;
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| 191 |
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}
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| 192 |
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if (rc < 0)
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break;
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| 194 |
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else
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| 195 |
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i = 0; /* reset i after each successful send */
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| 196 |
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iov.iov_base += rc;
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| 197 |
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iov.iov_len -= rc;
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| 198 |
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len -= rc;
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| 199 |
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}
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| 200 |
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| 201 |
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if (rc < 0) {
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| 202 |
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cERROR(1, ("Error %d sending data on socket to server", rc));
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| 203 |
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} else {
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| 204 |
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rc = 0;
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| 205 |
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}
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| 206 |
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| 207 |
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/* Don't want to modify the buffer as a
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| 208 |
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side effect of this call. */
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| 209 |
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smb_buffer->smb_buf_length = smb_buf_length;
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| 210 |
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| 211 |
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return rc;
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}
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| 213 |
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| 214 |
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static int
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smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
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| 216 |
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struct sockaddr *sin)
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| 217 |
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{
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| 218 |
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int rc = 0;
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| 219 |
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int i = 0;
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| 220 |
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struct msghdr smb_msg;
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| 221 |
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struct smb_hdr *smb_buffer = iov[0].iov_base;
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| 222 |
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unsigned int len = iov[0].iov_len;
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| 223 |
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unsigned int total_len;
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| 224 |
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int first_vec = 0;
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| 225 |
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unsigned int smb_buf_length = smb_buffer->smb_buf_length;
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| 226 |
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| 227 |
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if (ssocket == NULL)
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| 228 |
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return -ENOTSOCK; /* BB eventually add reconnect code here */
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| 229 |
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| 230 |
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smb_msg.msg_name = sin;
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| 231 |
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smb_msg.msg_namelen = sizeof(struct sockaddr);
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| 232 |
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smb_msg.msg_control = NULL;
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| 233 |
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smb_msg.msg_controllen = 0;
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| 234 |
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smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
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| 235 |
|
|
|
| 236 |
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/* smb header is converted in header_assemble. bcc and rest of SMB word
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| 237 |
|
|
area, and byte area if necessary, is converted to littleendian in
|
| 238 |
|
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cifssmb.c and RFC1001 len is converted to bigendian in smb_send
|
| 239 |
|
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Flags2 is converted in SendReceive */
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| 240 |
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|
| 241 |
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|
| 242 |
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total_len = 0;
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| 243 |
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for (i = 0; i < n_vec; i++)
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| 244 |
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total_len += iov[i].iov_len;
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| 245 |
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|
| 246 |
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smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
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| 247 |
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cFYI(1, ("Sending smb: total_len %d", total_len));
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| 248 |
|
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dump_smb(smb_buffer, len);
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| 249 |
|
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|
| 250 |
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while (total_len) {
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| 251 |
|
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rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
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| 252 |
|
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n_vec - first_vec, total_len);
|
| 253 |
|
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if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
|
| 254 |
|
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i++;
|
| 255 |
|
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if (i >= 14) {
|
| 256 |
|
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cERROR(1,
|
| 257 |
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("sends on sock %p stuck for 15 seconds",
|
| 258 |
|
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ssocket));
|
| 259 |
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rc = -EAGAIN;
|
| 260 |
|
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break;
|
| 261 |
|
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}
|
| 262 |
|
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msleep(1 << i);
|
| 263 |
|
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continue;
|
| 264 |
|
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}
|
| 265 |
|
|
if (rc < 0)
|
| 266 |
|
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break;
|
| 267 |
|
|
|
| 268 |
|
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if (rc >= total_len) {
|
| 269 |
|
|
WARN_ON(rc > total_len);
|
| 270 |
|
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break;
|
| 271 |
|
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}
|
| 272 |
|
|
if (rc == 0) {
|
| 273 |
|
|
/* should never happen, letting socket clear before
|
| 274 |
|
|
retrying is our only obvious option here */
|
| 275 |
|
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cERROR(1, ("tcp sent no data"));
|
| 276 |
|
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msleep(500);
|
| 277 |
|
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continue;
|
| 278 |
|
|
}
|
| 279 |
|
|
total_len -= rc;
|
| 280 |
|
|
/* the line below resets i */
|
| 281 |
|
|
for (i = first_vec; i < n_vec; i++) {
|
| 282 |
|
|
if (iov[i].iov_len) {
|
| 283 |
|
|
if (rc > iov[i].iov_len) {
|
| 284 |
|
|
rc -= iov[i].iov_len;
|
| 285 |
|
|
iov[i].iov_len = 0;
|
| 286 |
|
|
} else {
|
| 287 |
|
|
iov[i].iov_base += rc;
|
| 288 |
|
|
iov[i].iov_len -= rc;
|
| 289 |
|
|
first_vec = i;
|
| 290 |
|
|
break;
|
| 291 |
|
|
}
|
| 292 |
|
|
}
|
| 293 |
|
|
}
|
| 294 |
|
|
i = 0; /* in case we get ENOSPC on the next send */
|
| 295 |
|
|
}
|
| 296 |
|
|
|
| 297 |
|
|
if (rc < 0) {
|
| 298 |
|
|
cERROR(1, ("Error %d sending data on socket to server", rc));
|
| 299 |
|
|
} else
|
| 300 |
|
|
rc = 0;
|
| 301 |
|
|
|
| 302 |
|
|
/* Don't want to modify the buffer as a
|
| 303 |
|
|
side effect of this call. */
|
| 304 |
|
|
smb_buffer->smb_buf_length = smb_buf_length;
|
| 305 |
|
|
|
| 306 |
|
|
return rc;
|
| 307 |
|
|
}
|
| 308 |
|
|
|
| 309 |
|
|
static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
|
| 310 |
|
|
{
|
| 311 |
|
|
if (long_op == CIFS_ASYNC_OP) {
|
| 312 |
|
|
/* oplock breaks must not be held up */
|
| 313 |
|
|
atomic_inc(&ses->server->inFlight);
|
| 314 |
|
|
} else {
|
| 315 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 316 |
|
|
while (1) {
|
| 317 |
|
|
if (atomic_read(&ses->server->inFlight) >=
|
| 318 |
|
|
cifs_max_pending){
|
| 319 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 320 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 321 |
|
|
atomic_inc(&ses->server->num_waiters);
|
| 322 |
|
|
#endif
|
| 323 |
|
|
wait_event(ses->server->request_q,
|
| 324 |
|
|
atomic_read(&ses->server->inFlight)
|
| 325 |
|
|
< cifs_max_pending);
|
| 326 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 327 |
|
|
atomic_dec(&ses->server->num_waiters);
|
| 328 |
|
|
#endif
|
| 329 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 330 |
|
|
} else {
|
| 331 |
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
| 332 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 333 |
|
|
return -ENOENT;
|
| 334 |
|
|
}
|
| 335 |
|
|
|
| 336 |
|
|
/* can not count locking commands against total
|
| 337 |
|
|
as they are allowed to block on server */
|
| 338 |
|
|
|
| 339 |
|
|
/* update # of requests on the wire to server */
|
| 340 |
|
|
if (long_op != CIFS_BLOCKING_OP)
|
| 341 |
|
|
atomic_inc(&ses->server->inFlight);
|
| 342 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 343 |
|
|
break;
|
| 344 |
|
|
}
|
| 345 |
|
|
}
|
| 346 |
|
|
}
|
| 347 |
|
|
return 0;
|
| 348 |
|
|
}
|
| 349 |
|
|
|
| 350 |
|
|
static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
|
| 351 |
|
|
struct mid_q_entry **ppmidQ)
|
| 352 |
|
|
{
|
| 353 |
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
| 354 |
|
|
return -ENOENT;
|
| 355 |
|
|
} else if (ses->server->tcpStatus == CifsNeedReconnect) {
|
| 356 |
|
|
cFYI(1, ("tcp session dead - return to caller to retry"));
|
| 357 |
|
|
return -EAGAIN;
|
| 358 |
|
|
} else if (ses->status != CifsGood) {
|
| 359 |
|
|
/* check if SMB session is bad because we are setting it up */
|
| 360 |
|
|
if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
|
| 361 |
|
|
(in_buf->Command != SMB_COM_NEGOTIATE)) {
|
| 362 |
|
|
return -EAGAIN;
|
| 363 |
|
|
} /* else ok - we are setting up session */
|
| 364 |
|
|
}
|
| 365 |
|
|
*ppmidQ = AllocMidQEntry(in_buf, ses);
|
| 366 |
|
|
if (*ppmidQ == NULL)
|
| 367 |
|
|
return -ENOMEM;
|
| 368 |
|
|
return 0;
|
| 369 |
|
|
}
|
| 370 |
|
|
|
| 371 |
|
|
static int wait_for_response(struct cifsSesInfo *ses,
|
| 372 |
|
|
struct mid_q_entry *midQ,
|
| 373 |
|
|
unsigned long timeout,
|
| 374 |
|
|
unsigned long time_to_wait)
|
| 375 |
|
|
{
|
| 376 |
|
|
unsigned long curr_timeout;
|
| 377 |
|
|
|
| 378 |
|
|
for (;;) {
|
| 379 |
|
|
curr_timeout = timeout + jiffies;
|
| 380 |
|
|
wait_event(ses->server->response_q,
|
| 381 |
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
| 382 |
|
|
time_after(jiffies, curr_timeout) ||
|
| 383 |
|
|
((ses->server->tcpStatus != CifsGood) &&
|
| 384 |
|
|
(ses->server->tcpStatus != CifsNew)));
|
| 385 |
|
|
|
| 386 |
|
|
if (time_after(jiffies, curr_timeout) &&
|
| 387 |
|
|
(midQ->midState == MID_REQUEST_SUBMITTED) &&
|
| 388 |
|
|
((ses->server->tcpStatus == CifsGood) ||
|
| 389 |
|
|
(ses->server->tcpStatus == CifsNew))) {
|
| 390 |
|
|
|
| 391 |
|
|
unsigned long lrt;
|
| 392 |
|
|
|
| 393 |
|
|
/* We timed out. Is the server still
|
| 394 |
|
|
sending replies ? */
|
| 395 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 396 |
|
|
lrt = ses->server->lstrp;
|
| 397 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 398 |
|
|
|
| 399 |
|
|
/* Calculate time_to_wait past last receive time.
|
| 400 |
|
|
Although we prefer not to time out if the
|
| 401 |
|
|
server is still responding - we will time
|
| 402 |
|
|
out if the server takes more than 15 (or 45
|
| 403 |
|
|
or 180) seconds to respond to this request
|
| 404 |
|
|
and has not responded to any request from
|
| 405 |
|
|
other threads on the client within 10 seconds */
|
| 406 |
|
|
lrt += time_to_wait;
|
| 407 |
|
|
if (time_after(jiffies, lrt)) {
|
| 408 |
|
|
/* No replies for time_to_wait. */
|
| 409 |
|
|
cERROR(1, ("server not responding"));
|
| 410 |
|
|
return -1;
|
| 411 |
|
|
}
|
| 412 |
|
|
} else {
|
| 413 |
|
|
return 0;
|
| 414 |
|
|
}
|
| 415 |
|
|
}
|
| 416 |
|
|
}
|
| 417 |
|
|
|
| 418 |
|
|
|
| 419 |
|
|
/*
|
| 420 |
|
|
*
|
| 421 |
|
|
* Send an SMB Request. No response info (other than return code)
|
| 422 |
|
|
* needs to be parsed.
|
| 423 |
|
|
*
|
| 424 |
|
|
* flags indicate the type of request buffer and how long to wait
|
| 425 |
|
|
* and whether to log NT STATUS code (error) before mapping it to POSIX error
|
| 426 |
|
|
*
|
| 427 |
|
|
*/
|
| 428 |
|
|
int
|
| 429 |
|
|
SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
|
| 430 |
|
|
struct smb_hdr *in_buf, int flags)
|
| 431 |
|
|
{
|
| 432 |
|
|
int rc;
|
| 433 |
|
|
struct kvec iov[1];
|
| 434 |
|
|
int resp_buf_type;
|
| 435 |
|
|
|
| 436 |
|
|
iov[0].iov_base = (char *)in_buf;
|
| 437 |
|
|
iov[0].iov_len = in_buf->smb_buf_length + 4;
|
| 438 |
|
|
flags |= CIFS_NO_RESP;
|
| 439 |
|
|
rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
|
| 440 |
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
| 441 |
|
|
cFYI(1, ("SendRcvNoR flags %d rc %d", flags, rc));
|
| 442 |
|
|
#endif
|
| 443 |
|
|
return rc;
|
| 444 |
|
|
}
|
| 445 |
|
|
|
| 446 |
|
|
int
|
| 447 |
|
|
SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
|
| 448 |
|
|
struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
|
| 449 |
|
|
const int flags)
|
| 450 |
|
|
{
|
| 451 |
|
|
int rc = 0;
|
| 452 |
|
|
int long_op;
|
| 453 |
|
|
unsigned int receive_len;
|
| 454 |
|
|
unsigned long timeout;
|
| 455 |
|
|
struct mid_q_entry *midQ;
|
| 456 |
|
|
struct smb_hdr *in_buf = iov[0].iov_base;
|
| 457 |
|
|
|
| 458 |
|
|
long_op = flags & CIFS_TIMEOUT_MASK;
|
| 459 |
|
|
|
| 460 |
|
|
*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
|
| 461 |
|
|
|
| 462 |
|
|
if ((ses == NULL) || (ses->server == NULL)) {
|
| 463 |
|
|
cifs_small_buf_release(in_buf);
|
| 464 |
|
|
cERROR(1, ("Null session"));
|
| 465 |
|
|
return -EIO;
|
| 466 |
|
|
}
|
| 467 |
|
|
|
| 468 |
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
| 469 |
|
|
cifs_small_buf_release(in_buf);
|
| 470 |
|
|
return -ENOENT;
|
| 471 |
|
|
}
|
| 472 |
|
|
|
| 473 |
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
| 474 |
|
|
to the same server. We may make this configurable later or
|
| 475 |
|
|
use ses->maxReq */
|
| 476 |
|
|
|
| 477 |
|
|
rc = wait_for_free_request(ses, long_op);
|
| 478 |
|
|
if (rc) {
|
| 479 |
|
|
cifs_small_buf_release(in_buf);
|
| 480 |
|
|
return rc;
|
| 481 |
|
|
}
|
| 482 |
|
|
|
| 483 |
|
|
/* make sure that we sign in the same order that we send on this socket
|
| 484 |
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
| 485 |
|
|
of smb data */
|
| 486 |
|
|
|
| 487 |
|
|
down(&ses->server->tcpSem);
|
| 488 |
|
|
|
| 489 |
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
| 490 |
|
|
if (rc) {
|
| 491 |
|
|
up(&ses->server->tcpSem);
|
| 492 |
|
|
cifs_small_buf_release(in_buf);
|
| 493 |
|
|
/* Update # of requests on wire to server */
|
| 494 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 495 |
|
|
wake_up(&ses->server->request_q);
|
| 496 |
|
|
return rc;
|
| 497 |
|
|
}
|
| 498 |
|
|
rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
|
| 499 |
|
|
|
| 500 |
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
| 501 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 502 |
|
|
atomic_inc(&ses->server->inSend);
|
| 503 |
|
|
#endif
|
| 504 |
|
|
rc = smb_send2(ses->server->ssocket, iov, n_vec,
|
| 505 |
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
| 506 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 507 |
|
|
atomic_dec(&ses->server->inSend);
|
| 508 |
|
|
midQ->when_sent = jiffies;
|
| 509 |
|
|
#endif
|
| 510 |
|
|
|
| 511 |
|
|
up(&ses->server->tcpSem);
|
| 512 |
|
|
cifs_small_buf_release(in_buf);
|
| 513 |
|
|
|
| 514 |
|
|
if (rc < 0)
|
| 515 |
|
|
goto out;
|
| 516 |
|
|
|
| 517 |
|
|
if (long_op == CIFS_STD_OP)
|
| 518 |
|
|
timeout = 15 * HZ;
|
| 519 |
|
|
else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
|
| 520 |
|
|
timeout = 180 * HZ;
|
| 521 |
|
|
else if (long_op == CIFS_LONG_OP)
|
| 522 |
|
|
timeout = 45 * HZ; /* should be greater than
|
| 523 |
|
|
servers oplock break timeout (about 43 seconds) */
|
| 524 |
|
|
else if (long_op == CIFS_ASYNC_OP)
|
| 525 |
|
|
goto out;
|
| 526 |
|
|
else if (long_op == CIFS_BLOCKING_OP)
|
| 527 |
|
|
timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */
|
| 528 |
|
|
else {
|
| 529 |
|
|
cERROR(1, ("unknown timeout flag %d", long_op));
|
| 530 |
|
|
rc = -EIO;
|
| 531 |
|
|
goto out;
|
| 532 |
|
|
}
|
| 533 |
|
|
|
| 534 |
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
| 535 |
|
|
due to last connection to this server being unmounted */
|
| 536 |
|
|
if (signal_pending(current)) {
|
| 537 |
|
|
/* if signal pending do not hold up user for full smb timeout
|
| 538 |
|
|
but we still give response a chance to complete */
|
| 539 |
|
|
timeout = 2 * HZ;
|
| 540 |
|
|
}
|
| 541 |
|
|
|
| 542 |
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
| 543 |
|
|
wait_for_response(ses, midQ, timeout, 10 * HZ);
|
| 544 |
|
|
|
| 545 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 546 |
|
|
if (midQ->resp_buf) {
|
| 547 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 548 |
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
| 549 |
|
|
} else {
|
| 550 |
|
|
cERROR(1, ("No response to cmd %d mid %d",
|
| 551 |
|
|
midQ->command, midQ->mid));
|
| 552 |
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
| 553 |
|
|
if (ses->server->tcpStatus == CifsExiting)
|
| 554 |
|
|
rc = -EHOSTDOWN;
|
| 555 |
|
|
else {
|
| 556 |
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
| 557 |
|
|
midQ->midState = MID_RETRY_NEEDED;
|
| 558 |
|
|
}
|
| 559 |
|
|
}
|
| 560 |
|
|
|
| 561 |
|
|
if (rc != -EHOSTDOWN) {
|
| 562 |
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
| 563 |
|
|
rc = -EAGAIN;
|
| 564 |
|
|
cFYI(1, ("marking request for retry"));
|
| 565 |
|
|
} else {
|
| 566 |
|
|
rc = -EIO;
|
| 567 |
|
|
}
|
| 568 |
|
|
}
|
| 569 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 570 |
|
|
DeleteMidQEntry(midQ);
|
| 571 |
|
|
/* Update # of requests on wire to server */
|
| 572 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 573 |
|
|
wake_up(&ses->server->request_q);
|
| 574 |
|
|
return rc;
|
| 575 |
|
|
}
|
| 576 |
|
|
|
| 577 |
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
| 578 |
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
| 579 |
|
|
receive_len, xid));
|
| 580 |
|
|
rc = -EIO;
|
| 581 |
|
|
} else { /* rcvd frame is ok */
|
| 582 |
|
|
if (midQ->resp_buf &&
|
| 583 |
|
|
(midQ->midState == MID_RESPONSE_RECEIVED)) {
|
| 584 |
|
|
|
| 585 |
|
|
iov[0].iov_base = (char *)midQ->resp_buf;
|
| 586 |
|
|
if (midQ->largeBuf)
|
| 587 |
|
|
*pRespBufType = CIFS_LARGE_BUFFER;
|
| 588 |
|
|
else
|
| 589 |
|
|
*pRespBufType = CIFS_SMALL_BUFFER;
|
| 590 |
|
|
iov[0].iov_len = receive_len + 4;
|
| 591 |
|
|
|
| 592 |
|
|
dump_smb(midQ->resp_buf, 80);
|
| 593 |
|
|
/* convert the length into a more usable form */
|
| 594 |
|
|
if ((receive_len > 24) &&
|
| 595 |
|
|
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
|
| 596 |
|
|
SECMODE_SIGN_ENABLED))) {
|
| 597 |
|
|
rc = cifs_verify_signature(midQ->resp_buf,
|
| 598 |
|
|
&ses->server->mac_signing_key,
|
| 599 |
|
|
midQ->sequence_number+1);
|
| 600 |
|
|
if (rc) {
|
| 601 |
|
|
cERROR(1, ("Unexpected SMB signature"));
|
| 602 |
|
|
/* BB FIXME add code to kill session */
|
| 603 |
|
|
}
|
| 604 |
|
|
}
|
| 605 |
|
|
|
| 606 |
|
|
/* BB special case reconnect tid and uid here? */
|
| 607 |
|
|
rc = map_smb_to_linux_error(midQ->resp_buf,
|
| 608 |
|
|
flags & CIFS_LOG_ERROR);
|
| 609 |
|
|
|
| 610 |
|
|
/* convert ByteCount if necessary */
|
| 611 |
|
|
if (receive_len >= sizeof(struct smb_hdr) - 4
|
| 612 |
|
|
/* do not count RFC1001 header */ +
|
| 613 |
|
|
(2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
|
| 614 |
|
|
BCC(midQ->resp_buf) =
|
| 615 |
|
|
le16_to_cpu(BCC_LE(midQ->resp_buf));
|
| 616 |
|
|
if ((flags & CIFS_NO_RESP) == 0)
|
| 617 |
|
|
midQ->resp_buf = NULL; /* mark it so buf will
|
| 618 |
|
|
not be freed by
|
| 619 |
|
|
DeleteMidQEntry */
|
| 620 |
|
|
} else {
|
| 621 |
|
|
rc = -EIO;
|
| 622 |
|
|
cFYI(1, ("Bad MID state?"));
|
| 623 |
|
|
}
|
| 624 |
|
|
}
|
| 625 |
|
|
|
| 626 |
|
|
out:
|
| 627 |
|
|
DeleteMidQEntry(midQ);
|
| 628 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 629 |
|
|
wake_up(&ses->server->request_q);
|
| 630 |
|
|
|
| 631 |
|
|
return rc;
|
| 632 |
|
|
}
|
| 633 |
|
|
|
| 634 |
|
|
int
|
| 635 |
|
|
SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
|
| 636 |
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
| 637 |
|
|
int *pbytes_returned, const int long_op)
|
| 638 |
|
|
{
|
| 639 |
|
|
int rc = 0;
|
| 640 |
|
|
unsigned int receive_len;
|
| 641 |
|
|
unsigned long timeout;
|
| 642 |
|
|
struct mid_q_entry *midQ;
|
| 643 |
|
|
|
| 644 |
|
|
if (ses == NULL) {
|
| 645 |
|
|
cERROR(1, ("Null smb session"));
|
| 646 |
|
|
return -EIO;
|
| 647 |
|
|
}
|
| 648 |
|
|
if (ses->server == NULL) {
|
| 649 |
|
|
cERROR(1, ("Null tcp session"));
|
| 650 |
|
|
return -EIO;
|
| 651 |
|
|
}
|
| 652 |
|
|
|
| 653 |
|
|
if (ses->server->tcpStatus == CifsExiting)
|
| 654 |
|
|
return -ENOENT;
|
| 655 |
|
|
|
| 656 |
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
| 657 |
|
|
to the same server. We may make this configurable later or
|
| 658 |
|
|
use ses->maxReq */
|
| 659 |
|
|
|
| 660 |
|
|
rc = wait_for_free_request(ses, long_op);
|
| 661 |
|
|
if (rc)
|
| 662 |
|
|
return rc;
|
| 663 |
|
|
|
| 664 |
|
|
/* make sure that we sign in the same order that we send on this socket
|
| 665 |
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
| 666 |
|
|
of smb data */
|
| 667 |
|
|
|
| 668 |
|
|
down(&ses->server->tcpSem);
|
| 669 |
|
|
|
| 670 |
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
| 671 |
|
|
if (rc) {
|
| 672 |
|
|
up(&ses->server->tcpSem);
|
| 673 |
|
|
/* Update # of requests on wire to server */
|
| 674 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 675 |
|
|
wake_up(&ses->server->request_q);
|
| 676 |
|
|
return rc;
|
| 677 |
|
|
}
|
| 678 |
|
|
|
| 679 |
|
|
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
| 680 |
|
|
cERROR(1, ("Illegal length, greater than maximum frame, %d",
|
| 681 |
|
|
in_buf->smb_buf_length));
|
| 682 |
|
|
DeleteMidQEntry(midQ);
|
| 683 |
|
|
up(&ses->server->tcpSem);
|
| 684 |
|
|
/* Update # of requests on wire to server */
|
| 685 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 686 |
|
|
wake_up(&ses->server->request_q);
|
| 687 |
|
|
return -EIO;
|
| 688 |
|
|
}
|
| 689 |
|
|
|
| 690 |
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
| 691 |
|
|
|
| 692 |
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
| 693 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 694 |
|
|
atomic_inc(&ses->server->inSend);
|
| 695 |
|
|
#endif
|
| 696 |
|
|
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
|
| 697 |
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
| 698 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 699 |
|
|
atomic_dec(&ses->server->inSend);
|
| 700 |
|
|
midQ->when_sent = jiffies;
|
| 701 |
|
|
#endif
|
| 702 |
|
|
up(&ses->server->tcpSem);
|
| 703 |
|
|
|
| 704 |
|
|
if (rc < 0)
|
| 705 |
|
|
goto out;
|
| 706 |
|
|
|
| 707 |
|
|
if (long_op == CIFS_STD_OP)
|
| 708 |
|
|
timeout = 15 * HZ;
|
| 709 |
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
| 710 |
|
|
due to last connection to this server being unmounted */
|
| 711 |
|
|
else if (long_op == CIFS_ASYNC_OP)
|
| 712 |
|
|
goto out;
|
| 713 |
|
|
else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
|
| 714 |
|
|
timeout = 180 * HZ;
|
| 715 |
|
|
else if (long_op == CIFS_LONG_OP)
|
| 716 |
|
|
timeout = 45 * HZ; /* should be greater than
|
| 717 |
|
|
servers oplock break timeout (about 43 seconds) */
|
| 718 |
|
|
else if (long_op == CIFS_BLOCKING_OP)
|
| 719 |
|
|
timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
|
| 720 |
|
|
else {
|
| 721 |
|
|
cERROR(1, ("unknown timeout flag %d", long_op));
|
| 722 |
|
|
rc = -EIO;
|
| 723 |
|
|
goto out;
|
| 724 |
|
|
}
|
| 725 |
|
|
|
| 726 |
|
|
if (signal_pending(current)) {
|
| 727 |
|
|
/* if signal pending do not hold up user for full smb timeout
|
| 728 |
|
|
but we still give response a chance to complete */
|
| 729 |
|
|
timeout = 2 * HZ;
|
| 730 |
|
|
}
|
| 731 |
|
|
|
| 732 |
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
| 733 |
|
|
wait_for_response(ses, midQ, timeout, 10 * HZ);
|
| 734 |
|
|
|
| 735 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 736 |
|
|
if (midQ->resp_buf) {
|
| 737 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 738 |
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
| 739 |
|
|
} else {
|
| 740 |
|
|
cERROR(1, ("No response for cmd %d mid %d",
|
| 741 |
|
|
midQ->command, midQ->mid));
|
| 742 |
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
| 743 |
|
|
if (ses->server->tcpStatus == CifsExiting)
|
| 744 |
|
|
rc = -EHOSTDOWN;
|
| 745 |
|
|
else {
|
| 746 |
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
| 747 |
|
|
midQ->midState = MID_RETRY_NEEDED;
|
| 748 |
|
|
}
|
| 749 |
|
|
}
|
| 750 |
|
|
|
| 751 |
|
|
if (rc != -EHOSTDOWN) {
|
| 752 |
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
| 753 |
|
|
rc = -EAGAIN;
|
| 754 |
|
|
cFYI(1, ("marking request for retry"));
|
| 755 |
|
|
} else {
|
| 756 |
|
|
rc = -EIO;
|
| 757 |
|
|
}
|
| 758 |
|
|
}
|
| 759 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 760 |
|
|
DeleteMidQEntry(midQ);
|
| 761 |
|
|
/* Update # of requests on wire to server */
|
| 762 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 763 |
|
|
wake_up(&ses->server->request_q);
|
| 764 |
|
|
return rc;
|
| 765 |
|
|
}
|
| 766 |
|
|
|
| 767 |
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
| 768 |
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
| 769 |
|
|
receive_len, xid));
|
| 770 |
|
|
rc = -EIO;
|
| 771 |
|
|
} else { /* rcvd frame is ok */
|
| 772 |
|
|
|
| 773 |
|
|
if (midQ->resp_buf && out_buf
|
| 774 |
|
|
&& (midQ->midState == MID_RESPONSE_RECEIVED)) {
|
| 775 |
|
|
out_buf->smb_buf_length = receive_len;
|
| 776 |
|
|
memcpy((char *)out_buf + 4,
|
| 777 |
|
|
(char *)midQ->resp_buf + 4,
|
| 778 |
|
|
receive_len);
|
| 779 |
|
|
|
| 780 |
|
|
dump_smb(out_buf, 92);
|
| 781 |
|
|
/* convert the length into a more usable form */
|
| 782 |
|
|
if ((receive_len > 24) &&
|
| 783 |
|
|
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
|
| 784 |
|
|
SECMODE_SIGN_ENABLED))) {
|
| 785 |
|
|
rc = cifs_verify_signature(out_buf,
|
| 786 |
|
|
&ses->server->mac_signing_key,
|
| 787 |
|
|
midQ->sequence_number+1);
|
| 788 |
|
|
if (rc) {
|
| 789 |
|
|
cERROR(1, ("Unexpected SMB signature"));
|
| 790 |
|
|
/* BB FIXME add code to kill session */
|
| 791 |
|
|
}
|
| 792 |
|
|
}
|
| 793 |
|
|
|
| 794 |
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
| 795 |
|
|
|
| 796 |
|
|
/* BB special case reconnect tid and uid here? */
|
| 797 |
|
|
rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
|
| 798 |
|
|
|
| 799 |
|
|
/* convert ByteCount if necessary */
|
| 800 |
|
|
if (receive_len >= sizeof(struct smb_hdr) - 4
|
| 801 |
|
|
/* do not count RFC1001 header */ +
|
| 802 |
|
|
(2 * out_buf->WordCount) + 2 /* bcc */ )
|
| 803 |
|
|
BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
|
| 804 |
|
|
} else {
|
| 805 |
|
|
rc = -EIO;
|
| 806 |
|
|
cERROR(1, ("Bad MID state?"));
|
| 807 |
|
|
}
|
| 808 |
|
|
}
|
| 809 |
|
|
|
| 810 |
|
|
out:
|
| 811 |
|
|
DeleteMidQEntry(midQ);
|
| 812 |
|
|
atomic_dec(&ses->server->inFlight);
|
| 813 |
|
|
wake_up(&ses->server->request_q);
|
| 814 |
|
|
|
| 815 |
|
|
return rc;
|
| 816 |
|
|
}
|
| 817 |
|
|
|
| 818 |
|
|
/* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
|
| 819 |
|
|
|
| 820 |
|
|
static int
|
| 821 |
|
|
send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf,
|
| 822 |
|
|
struct mid_q_entry *midQ)
|
| 823 |
|
|
{
|
| 824 |
|
|
int rc = 0;
|
| 825 |
|
|
struct cifsSesInfo *ses = tcon->ses;
|
| 826 |
|
|
__u16 mid = in_buf->Mid;
|
| 827 |
|
|
|
| 828 |
|
|
header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0);
|
| 829 |
|
|
in_buf->Mid = mid;
|
| 830 |
|
|
down(&ses->server->tcpSem);
|
| 831 |
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
| 832 |
|
|
if (rc) {
|
| 833 |
|
|
up(&ses->server->tcpSem);
|
| 834 |
|
|
return rc;
|
| 835 |
|
|
}
|
| 836 |
|
|
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
|
| 837 |
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
| 838 |
|
|
up(&ses->server->tcpSem);
|
| 839 |
|
|
return rc;
|
| 840 |
|
|
}
|
| 841 |
|
|
|
| 842 |
|
|
/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
|
| 843 |
|
|
blocking lock to return. */
|
| 844 |
|
|
|
| 845 |
|
|
static int
|
| 846 |
|
|
send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
|
| 847 |
|
|
struct smb_hdr *in_buf,
|
| 848 |
|
|
struct smb_hdr *out_buf)
|
| 849 |
|
|
{
|
| 850 |
|
|
int bytes_returned;
|
| 851 |
|
|
struct cifsSesInfo *ses = tcon->ses;
|
| 852 |
|
|
LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
|
| 853 |
|
|
|
| 854 |
|
|
/* We just modify the current in_buf to change
|
| 855 |
|
|
the type of lock from LOCKING_ANDX_SHARED_LOCK
|
| 856 |
|
|
or LOCKING_ANDX_EXCLUSIVE_LOCK to
|
| 857 |
|
|
LOCKING_ANDX_CANCEL_LOCK. */
|
| 858 |
|
|
|
| 859 |
|
|
pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
|
| 860 |
|
|
pSMB->Timeout = 0;
|
| 861 |
|
|
pSMB->hdr.Mid = GetNextMid(ses->server);
|
| 862 |
|
|
|
| 863 |
|
|
return SendReceive(xid, ses, in_buf, out_buf,
|
| 864 |
|
|
&bytes_returned, CIFS_STD_OP);
|
| 865 |
|
|
}
|
| 866 |
|
|
|
| 867 |
|
|
int
|
| 868 |
|
|
SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
|
| 869 |
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
| 870 |
|
|
int *pbytes_returned)
|
| 871 |
|
|
{
|
| 872 |
|
|
int rc = 0;
|
| 873 |
|
|
int rstart = 0;
|
| 874 |
|
|
unsigned int receive_len;
|
| 875 |
|
|
struct mid_q_entry *midQ;
|
| 876 |
|
|
struct cifsSesInfo *ses;
|
| 877 |
|
|
|
| 878 |
|
|
if (tcon == NULL || tcon->ses == NULL) {
|
| 879 |
|
|
cERROR(1, ("Null smb session"));
|
| 880 |
|
|
return -EIO;
|
| 881 |
|
|
}
|
| 882 |
|
|
ses = tcon->ses;
|
| 883 |
|
|
|
| 884 |
|
|
if (ses->server == NULL) {
|
| 885 |
|
|
cERROR(1, ("Null tcp session"));
|
| 886 |
|
|
return -EIO;
|
| 887 |
|
|
}
|
| 888 |
|
|
|
| 889 |
|
|
if (ses->server->tcpStatus == CifsExiting)
|
| 890 |
|
|
return -ENOENT;
|
| 891 |
|
|
|
| 892 |
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
| 893 |
|
|
to the same server. We may make this configurable later or
|
| 894 |
|
|
use ses->maxReq */
|
| 895 |
|
|
|
| 896 |
|
|
rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
|
| 897 |
|
|
if (rc)
|
| 898 |
|
|
return rc;
|
| 899 |
|
|
|
| 900 |
|
|
/* make sure that we sign in the same order that we send on this socket
|
| 901 |
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
| 902 |
|
|
of smb data */
|
| 903 |
|
|
|
| 904 |
|
|
down(&ses->server->tcpSem);
|
| 905 |
|
|
|
| 906 |
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
| 907 |
|
|
if (rc) {
|
| 908 |
|
|
up(&ses->server->tcpSem);
|
| 909 |
|
|
return rc;
|
| 910 |
|
|
}
|
| 911 |
|
|
|
| 912 |
|
|
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
| 913 |
|
|
up(&ses->server->tcpSem);
|
| 914 |
|
|
cERROR(1, ("Illegal length, greater than maximum frame, %d",
|
| 915 |
|
|
in_buf->smb_buf_length));
|
| 916 |
|
|
DeleteMidQEntry(midQ);
|
| 917 |
|
|
return -EIO;
|
| 918 |
|
|
}
|
| 919 |
|
|
|
| 920 |
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
| 921 |
|
|
|
| 922 |
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
| 923 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 924 |
|
|
atomic_inc(&ses->server->inSend);
|
| 925 |
|
|
#endif
|
| 926 |
|
|
rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
|
| 927 |
|
|
(struct sockaddr *) &(ses->server->addr.sockAddr));
|
| 928 |
|
|
#ifdef CONFIG_CIFS_STATS2
|
| 929 |
|
|
atomic_dec(&ses->server->inSend);
|
| 930 |
|
|
midQ->when_sent = jiffies;
|
| 931 |
|
|
#endif
|
| 932 |
|
|
up(&ses->server->tcpSem);
|
| 933 |
|
|
|
| 934 |
|
|
if (rc < 0) {
|
| 935 |
|
|
DeleteMidQEntry(midQ);
|
| 936 |
|
|
return rc;
|
| 937 |
|
|
}
|
| 938 |
|
|
|
| 939 |
|
|
/* Wait for a reply - allow signals to interrupt. */
|
| 940 |
|
|
rc = wait_event_interruptible(ses->server->response_q,
|
| 941 |
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
| 942 |
|
|
((ses->server->tcpStatus != CifsGood) &&
|
| 943 |
|
|
(ses->server->tcpStatus != CifsNew)));
|
| 944 |
|
|
|
| 945 |
|
|
/* Were we interrupted by a signal ? */
|
| 946 |
|
|
if ((rc == -ERESTARTSYS) &&
|
| 947 |
|
|
(midQ->midState == MID_REQUEST_SUBMITTED) &&
|
| 948 |
|
|
((ses->server->tcpStatus == CifsGood) ||
|
| 949 |
|
|
(ses->server->tcpStatus == CifsNew))) {
|
| 950 |
|
|
|
| 951 |
|
|
if (in_buf->Command == SMB_COM_TRANSACTION2) {
|
| 952 |
|
|
/* POSIX lock. We send a NT_CANCEL SMB to cause the
|
| 953 |
|
|
blocking lock to return. */
|
| 954 |
|
|
|
| 955 |
|
|
rc = send_nt_cancel(tcon, in_buf, midQ);
|
| 956 |
|
|
if (rc) {
|
| 957 |
|
|
DeleteMidQEntry(midQ);
|
| 958 |
|
|
return rc;
|
| 959 |
|
|
}
|
| 960 |
|
|
} else {
|
| 961 |
|
|
/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
|
| 962 |
|
|
to cause the blocking lock to return. */
|
| 963 |
|
|
|
| 964 |
|
|
rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
|
| 965 |
|
|
|
| 966 |
|
|
/* If we get -ENOLCK back the lock may have
|
| 967 |
|
|
already been removed. Don't exit in this case. */
|
| 968 |
|
|
if (rc && rc != -ENOLCK) {
|
| 969 |
|
|
DeleteMidQEntry(midQ);
|
| 970 |
|
|
return rc;
|
| 971 |
|
|
}
|
| 972 |
|
|
}
|
| 973 |
|
|
|
| 974 |
|
|
/* Wait 5 seconds for the response. */
|
| 975 |
|
|
if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) {
|
| 976 |
|
|
/* We got the response - restart system call. */
|
| 977 |
|
|
rstart = 1;
|
| 978 |
|
|
}
|
| 979 |
|
|
}
|
| 980 |
|
|
|
| 981 |
|
|
spin_lock(&GlobalMid_Lock);
|
| 982 |
|
|
if (midQ->resp_buf) {
|
| 983 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 984 |
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
| 985 |
|
|
} else {
|
| 986 |
|
|
cERROR(1, ("No response for cmd %d mid %d",
|
| 987 |
|
|
midQ->command, midQ->mid));
|
| 988 |
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
| 989 |
|
|
if (ses->server->tcpStatus == CifsExiting)
|
| 990 |
|
|
rc = -EHOSTDOWN;
|
| 991 |
|
|
else {
|
| 992 |
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
| 993 |
|
|
midQ->midState = MID_RETRY_NEEDED;
|
| 994 |
|
|
}
|
| 995 |
|
|
}
|
| 996 |
|
|
|
| 997 |
|
|
if (rc != -EHOSTDOWN) {
|
| 998 |
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
| 999 |
|
|
rc = -EAGAIN;
|
| 1000 |
|
|
cFYI(1, ("marking request for retry"));
|
| 1001 |
|
|
} else {
|
| 1002 |
|
|
rc = -EIO;
|
| 1003 |
|
|
}
|
| 1004 |
|
|
}
|
| 1005 |
|
|
spin_unlock(&GlobalMid_Lock);
|
| 1006 |
|
|
DeleteMidQEntry(midQ);
|
| 1007 |
|
|
return rc;
|
| 1008 |
|
|
}
|
| 1009 |
|
|
|
| 1010 |
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
| 1011 |
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
| 1012 |
|
|
receive_len, xid));
|
| 1013 |
|
|
rc = -EIO;
|
| 1014 |
|
|
} else { /* rcvd frame is ok */
|
| 1015 |
|
|
|
| 1016 |
|
|
if (midQ->resp_buf && out_buf
|
| 1017 |
|
|
&& (midQ->midState == MID_RESPONSE_RECEIVED)) {
|
| 1018 |
|
|
out_buf->smb_buf_length = receive_len;
|
| 1019 |
|
|
memcpy((char *)out_buf + 4,
|
| 1020 |
|
|
(char *)midQ->resp_buf + 4,
|
| 1021 |
|
|
receive_len);
|
| 1022 |
|
|
|
| 1023 |
|
|
dump_smb(out_buf, 92);
|
| 1024 |
|
|
/* convert the length into a more usable form */
|
| 1025 |
|
|
if ((receive_len > 24) &&
|
| 1026 |
|
|
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
|
| 1027 |
|
|
SECMODE_SIGN_ENABLED))) {
|
| 1028 |
|
|
rc = cifs_verify_signature(out_buf,
|
| 1029 |
|
|
&ses->server->mac_signing_key,
|
| 1030 |
|
|
midQ->sequence_number+1);
|
| 1031 |
|
|
if (rc) {
|
| 1032 |
|
|
cERROR(1, ("Unexpected SMB signature"));
|
| 1033 |
|
|
/* BB FIXME add code to kill session */
|
| 1034 |
|
|
}
|
| 1035 |
|
|
}
|
| 1036 |
|
|
|
| 1037 |
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
| 1038 |
|
|
|
| 1039 |
|
|
/* BB special case reconnect tid and uid here? */
|
| 1040 |
|
|
rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
|
| 1041 |
|
|
|
| 1042 |
|
|
/* convert ByteCount if necessary */
|
| 1043 |
|
|
if (receive_len >= sizeof(struct smb_hdr) - 4
|
| 1044 |
|
|
/* do not count RFC1001 header */ +
|
| 1045 |
|
|
(2 * out_buf->WordCount) + 2 /* bcc */ )
|
| 1046 |
|
|
BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
|
| 1047 |
|
|
} else {
|
| 1048 |
|
|
rc = -EIO;
|
| 1049 |
|
|
cERROR(1, ("Bad MID state?"));
|
| 1050 |
|
|
}
|
| 1051 |
|
|
}
|
| 1052 |
|
|
DeleteMidQEntry(midQ);
|
| 1053 |
|
|
if (rstart && rc == -EACCES)
|
| 1054 |
|
|
return -ERESTARTSYS;
|
| 1055 |
|
|
return rc;
|
| 1056 |
|
|
}
|
