2b84a36c55
In order to incorporate async requests, we need to allow for a more general way to do things on receive, rather than just waking up a process. Turn the task pointer in the mid_q_entry into a callback function and a generic data pointer. When a response comes in, or the socket is reconnected, cifsd can call the callback function in order to wake up the process. The default is to just wake up the current process which should mean no change in behavior for existing code. Also, clean up the locking in cifs_reconnect. There doesn't seem to be any need to hold both the srv_mutex and GlobalMid_Lock when walking the list of mids. Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
919 lines
23 KiB
C
919 lines
23 KiB
C
/*
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* fs/cifs/transport.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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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/gfp.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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static void
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wake_up_task(struct mid_q_entry *mid)
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{
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wake_up_process(mid->callback_data);
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}
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static struct mid_q_entry *
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AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
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{
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struct mid_q_entry *temp;
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if (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 = mempool_alloc(cifs_mid_poolp, 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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/*
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* The default is for the mid to be synchronous, so the
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* default callback just wakes up the current task.
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*/
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temp->callback = wake_up_task;
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temp->callback_data = current;
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}
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atomic_inc(&midCount);
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temp->midState = MID_REQUEST_ALLOCATED;
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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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midEntry->midState = MID_FREE;
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atomic_dec(&midCount);
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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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static void
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delete_mid(struct mid_q_entry *mid)
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{
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spin_lock(&GlobalMid_Lock);
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list_del(&mid->qhead);
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spin_unlock(&GlobalMid_Lock);
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DeleteMidQEntry(mid);
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}
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static int
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smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
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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 smb_hdr *smb_buffer = iov[0].iov_base;
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unsigned int len = iov[0].iov_len;
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unsigned int total_len;
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int first_vec = 0;
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unsigned int smb_buf_length = smb_buffer->smb_buf_length;
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struct socket *ssocket = server->ssocket;
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if (ssocket == NULL)
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return -ENOTSOCK; /* BB eventually add reconnect code here */
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smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
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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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if (server->noblocksnd)
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smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
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else
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smb_msg.msg_flags = MSG_NOSIGNAL;
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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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total_len = 0;
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for (i = 0; i < n_vec; i++)
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total_len += iov[i].iov_len;
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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: total_len %d", total_len);
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dump_smb(smb_buffer, len);
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i = 0;
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while (total_len) {
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rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
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n_vec - first_vec, total_len);
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if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
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i++;
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/* if blocking send we try 3 times, since each can block
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for 5 seconds. For nonblocking we have to try more
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but wait increasing amounts of time allowing time for
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socket to clear. The overall time we wait in either
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case to send on the socket is about 15 seconds.
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Similarly we wait for 15 seconds for
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a response from the server in SendReceive[2]
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for the server to send a response back for
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most types of requests (except SMB Write
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past end of file which can be slow, and
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blocking lock operations). NFS waits slightly longer
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than CIFS, but this can make it take longer for
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nonresponsive servers to be detected and 15 seconds
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is more than enough time for modern networks to
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send a packet. In most cases if we fail to send
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after the retries we will kill the socket and
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reconnect which may clear the network problem.
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*/
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if ((i >= 14) || (!server->noblocksnd && (i > 2))) {
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cERROR(1, "sends on sock %p stuck for 15 seconds",
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ssocket);
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rc = -EAGAIN;
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break;
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}
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msleep(1 << i);
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continue;
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}
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if (rc < 0)
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break;
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if (rc == total_len) {
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total_len = 0;
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break;
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} else if (rc > total_len) {
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cERROR(1, "sent %d requested %d", rc, total_len);
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break;
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}
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if (rc == 0) {
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/* should never happen, letting socket clear before
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retrying is our only obvious option here */
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cERROR(1, "tcp sent no data");
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msleep(500);
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continue;
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}
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total_len -= rc;
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/* the line below resets i */
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for (i = first_vec; i < n_vec; i++) {
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if (iov[i].iov_len) {
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if (rc > iov[i].iov_len) {
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rc -= iov[i].iov_len;
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iov[i].iov_len = 0;
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} else {
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iov[i].iov_base += rc;
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iov[i].iov_len -= rc;
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first_vec = i;
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break;
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}
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}
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}
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i = 0; /* in case we get ENOSPC on the next send */
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}
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if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
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cFYI(1, "partial send (%d remaining), terminating session",
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total_len);
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/* If we have only sent part of an SMB then the next SMB
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could be taken as the remainder of this one. We need
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to kill the socket so the server throws away the partial
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SMB */
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server->tcpStatus = CifsNeedReconnect;
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}
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if (rc < 0) {
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cERROR(1, "Error %d sending data on socket to server", rc);
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} else
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rc = 0;
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/* Don't want to modify the buffer as a
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side effect of this call. */
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smb_buffer->smb_buf_length = smb_buf_length;
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return rc;
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}
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int
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smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
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unsigned int smb_buf_length)
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{
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struct kvec iov;
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iov.iov_base = smb_buffer;
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iov.iov_len = smb_buf_length + 4;
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return smb_sendv(server, &iov, 1);
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}
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static int wait_for_free_request(struct TCP_Server_Info *server,
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const int long_op)
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{
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if (long_op == CIFS_ASYNC_OP) {
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/* oplock breaks must not be held up */
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atomic_inc(&server->inFlight);
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return 0;
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}
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spin_lock(&GlobalMid_Lock);
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while (1) {
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if (atomic_read(&server->inFlight) >= cifs_max_pending) {
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spin_unlock(&GlobalMid_Lock);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&server->num_waiters);
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#endif
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wait_event(server->request_q,
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atomic_read(&server->inFlight)
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< cifs_max_pending);
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#ifdef CONFIG_CIFS_STATS2
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atomic_dec(&server->num_waiters);
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#endif
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spin_lock(&GlobalMid_Lock);
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} else {
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if (server->tcpStatus == CifsExiting) {
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spin_unlock(&GlobalMid_Lock);
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return -ENOENT;
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}
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/* can not count locking commands against total
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as they are allowed to block on server */
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|
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/* update # of requests on the wire to server */
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if (long_op != CIFS_BLOCKING_OP)
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atomic_inc(&server->inFlight);
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spin_unlock(&GlobalMid_Lock);
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break;
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}
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}
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return 0;
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}
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static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
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struct mid_q_entry **ppmidQ)
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{
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if (ses->server->tcpStatus == CifsExiting) {
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return -ENOENT;
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}
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|
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if (ses->server->tcpStatus == CifsNeedReconnect) {
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cFYI(1, "tcp session dead - return to caller to retry");
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return -EAGAIN;
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}
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|
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if (ses->status != CifsGood) {
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/* check if SMB session is bad because we are setting it up */
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if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
|
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(in_buf->Command != SMB_COM_NEGOTIATE))
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return -EAGAIN;
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/* else ok - we are setting up session */
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}
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*ppmidQ = AllocMidQEntry(in_buf, ses->server);
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if (*ppmidQ == NULL)
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return -ENOMEM;
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
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spin_unlock(&GlobalMid_Lock);
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return 0;
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}
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|
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static int
|
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wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
|
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{
|
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int error;
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error = wait_event_killable(server->response_q,
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midQ->midState != MID_REQUEST_SUBMITTED);
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if (error < 0)
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return -ERESTARTSYS;
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|
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return 0;
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}
|
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|
|
|
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/*
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*
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* Send an SMB Request. No response info (other than return code)
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* needs to be parsed.
|
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*
|
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* flags indicate the type of request buffer and how long to wait
|
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* and whether to log NT STATUS code (error) before mapping it to POSIX error
|
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*
|
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*/
|
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int
|
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SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
|
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struct smb_hdr *in_buf, int flags)
|
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{
|
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int rc;
|
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struct kvec iov[1];
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int resp_buf_type;
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iov[0].iov_base = (char *)in_buf;
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iov[0].iov_len = in_buf->smb_buf_length + 4;
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flags |= CIFS_NO_RESP;
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rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
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cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc);
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return rc;
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}
|
|
|
|
static int
|
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sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
|
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{
|
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int rc = 0;
|
|
|
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cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command,
|
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mid->mid, mid->midState);
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|
|
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spin_lock(&GlobalMid_Lock);
|
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/* ensure that it's no longer on the pending_mid_q */
|
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list_del_init(&mid->qhead);
|
|
|
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switch (mid->midState) {
|
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case MID_RESPONSE_RECEIVED:
|
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spin_unlock(&GlobalMid_Lock);
|
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return rc;
|
|
case MID_REQUEST_SUBMITTED:
|
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/* socket is going down, reject all calls */
|
|
if (server->tcpStatus == CifsExiting) {
|
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cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d",
|
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__func__, mid->mid, mid->command, mid->midState);
|
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rc = -EHOSTDOWN;
|
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break;
|
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}
|
|
case MID_RETRY_NEEDED:
|
|
rc = -EAGAIN;
|
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break;
|
|
default:
|
|
cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__,
|
|
mid->mid, mid->midState);
|
|
rc = -EIO;
|
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}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
DeleteMidQEntry(mid);
|
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return rc;
|
|
}
|
|
|
|
int
|
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SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
|
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struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
|
|
const int flags)
|
|
{
|
|
int rc = 0;
|
|
int long_op;
|
|
unsigned int receive_len;
|
|
struct mid_q_entry *midQ;
|
|
struct smb_hdr *in_buf = iov[0].iov_base;
|
|
|
|
long_op = flags & CIFS_TIMEOUT_MASK;
|
|
|
|
*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 */
|
|
|
|
rc = wait_for_free_request(ses->server, long_op);
|
|
if (rc) {
|
|
cifs_small_buf_release(in_buf);
|
|
return rc;
|
|
}
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
cifs_small_buf_release(in_buf);
|
|
/* Update # of requests on wire to server */
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
cifs_small_buf_release(in_buf);
|
|
goto out;
|
|
}
|
|
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->inSend);
|
|
#endif
|
|
rc = smb_sendv(ses->server, iov, n_vec);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->inSend);
|
|
midQ->when_sent = jiffies;
|
|
#endif
|
|
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
cifs_small_buf_release(in_buf);
|
|
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
if (long_op == CIFS_ASYNC_OP)
|
|
goto out;
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
rc = sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, "Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid);
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* 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,
|
|
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? */
|
|
rc = map_smb_to_linux_error(midQ->resp_buf,
|
|
flags & CIFS_LOG_ERROR);
|
|
|
|
/* 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));
|
|
if ((flags & CIFS_NO_RESP) == 0)
|
|
midQ->resp_buf = NULL; /* mark it so buf will
|
|
not be freed by
|
|
delete_mid */
|
|
} else {
|
|
rc = -EIO;
|
|
cFYI(1, "Bad MID state?");
|
|
}
|
|
|
|
out:
|
|
delete_mid(midQ);
|
|
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;
|
|
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 (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
cERROR(1, "Illegal length, greater than maximum frame, %d",
|
|
in_buf->smb_buf_length);
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, long_op);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
/* Update # of requests on wire to server */
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
goto out;
|
|
}
|
|
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->inSend);
|
|
#endif
|
|
rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->inSend);
|
|
midQ->when_sent = jiffies;
|
|
#endif
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
if (long_op == CIFS_ASYNC_OP)
|
|
goto out;
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
rc = sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, "Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid);
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* 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,
|
|
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, 0 /* no log */ );
|
|
|
|
/* 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?");
|
|
}
|
|
|
|
out:
|
|
delete_mid(midQ);
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
|
|
|
|
static int
|
|
send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf,
|
|
struct mid_q_entry *midQ)
|
|
{
|
|
int rc = 0;
|
|
struct cifsSesInfo *ses = tcon->ses;
|
|
__u16 mid = in_buf->Mid;
|
|
|
|
header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0);
|
|
in_buf->Mid = mid;
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
|
|
blocking lock to return. */
|
|
|
|
static int
|
|
send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
|
|
struct smb_hdr *in_buf,
|
|
struct smb_hdr *out_buf)
|
|
{
|
|
int bytes_returned;
|
|
struct cifsSesInfo *ses = tcon->ses;
|
|
LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
|
|
|
|
/* We just modify the current in_buf to change
|
|
the type of lock from LOCKING_ANDX_SHARED_LOCK
|
|
or LOCKING_ANDX_EXCLUSIVE_LOCK to
|
|
LOCKING_ANDX_CANCEL_LOCK. */
|
|
|
|
pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
|
|
pSMB->Timeout = 0;
|
|
pSMB->hdr.Mid = GetNextMid(ses->server);
|
|
|
|
return SendReceive(xid, ses, in_buf, out_buf,
|
|
&bytes_returned, CIFS_STD_OP);
|
|
}
|
|
|
|
int
|
|
SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned)
|
|
{
|
|
int rc = 0;
|
|
int rstart = 0;
|
|
unsigned int receive_len;
|
|
struct mid_q_entry *midQ;
|
|
struct cifsSesInfo *ses;
|
|
|
|
if (tcon == NULL || tcon->ses == NULL) {
|
|
cERROR(1, "Null smb session");
|
|
return -EIO;
|
|
}
|
|
ses = tcon->ses;
|
|
|
|
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 (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
cERROR(1, "Illegal length, greater than maximum frame, %d",
|
|
in_buf->smb_buf_length);
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
delete_mid(midQ);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
midQ->midState = MID_REQUEST_SUBMITTED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_inc(&ses->server->inSend);
|
|
#endif
|
|
rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_dec(&ses->server->inSend);
|
|
midQ->when_sent = jiffies;
|
|
#endif
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
|
|
/* Wait for a reply - allow signals to interrupt. */
|
|
rc = wait_event_interruptible(ses->server->response_q,
|
|
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
|
|
/* Were we interrupted by a signal ? */
|
|
if ((rc == -ERESTARTSYS) &&
|
|
(midQ->midState == MID_REQUEST_SUBMITTED) &&
|
|
((ses->server->tcpStatus == CifsGood) ||
|
|
(ses->server->tcpStatus == CifsNew))) {
|
|
|
|
if (in_buf->Command == SMB_COM_TRANSACTION2) {
|
|
/* POSIX lock. We send a NT_CANCEL SMB to cause the
|
|
blocking lock to return. */
|
|
|
|
rc = send_nt_cancel(tcon, in_buf, midQ);
|
|
if (rc) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
} else {
|
|
/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
|
|
to cause the blocking lock to return. */
|
|
|
|
rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
|
|
|
|
/* If we get -ENOLCK back the lock may have
|
|
already been removed. Don't exit in this case. */
|
|
if (rc && rc != -ENOLCK) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
if (wait_for_response(ses->server, midQ) == 0) {
|
|
/* We got the response - restart system call. */
|
|
rstart = 1;
|
|
}
|
|
}
|
|
|
|
rc = sync_mid_result(midQ, ses->server);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, "Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid);
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* rcvd frame is ok */
|
|
|
|
if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) {
|
|
rc = -EIO;
|
|
cERROR(1, "Bad MID state?");
|
|
goto out;
|
|
}
|
|
|
|
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,
|
|
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, 0 /* no log */ );
|
|
|
|
/* 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));
|
|
|
|
out:
|
|
delete_mid(midQ);
|
|
if (rstart && rc == -EACCES)
|
|
return -ERESTARTSYS;
|
|
return rc;
|
|
}
|