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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
3bc303c254
This is the fourth respin of the patch to convert oplock breaks to use the slow_work facility. A customer of ours was testing a backport of one of the earlier patchsets, and hit a "Busy inodes after umount..." problem. An oplock break job had raced with a umount, and the superblock got torn down and its memory reused. When the oplock break job tried to dereference the inode->i_sb, the kernel oopsed. This patchset has the oplock break job hold an inode and vfsmount reference until the oplock break completes. With this, there should be no need to take a tcon reference (the vfsmount implicitly holds one already). Currently, when an oplock break comes in there's a chance that the oplock break job won't occur if the allocation of the oplock_q_entry fails. There are also some rather nasty races in the allocation and handling these structs. Rather than allocating oplock queue entries when an oplock break comes in, add a few extra fields to the cifsFileInfo struct. Get rid of the dedicated cifs_oplock_thread as well and queue the oplock break job to the slow_work thread pool. This approach also has the advantage that the oplock break jobs can potentially run in parallel rather than be serialized like they are today. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
1009 lines
27 KiB
C
1009 lines
27 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/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 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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temp->tsk = current;
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}
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&temp->qhead, &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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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->addr.sockAddr;
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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,
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("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 cifsSesInfo *ses, 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(&ses->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(&ses->server->inFlight) >=
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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(&ses->server->num_waiters);
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#endif
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wait_event(ses->server->request_q,
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atomic_read(&ses->server->inFlight)
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< cifs_max_pending);
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#ifdef CONFIG_CIFS_STATS2
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atomic_dec(&ses->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 (ses->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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/* update # of requests on the wire to server */
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if (long_op != CIFS_BLOCKING_OP)
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atomic_inc(&ses->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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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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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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return 0;
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}
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static int wait_for_response(struct cifsSesInfo *ses,
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struct mid_q_entry *midQ,
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unsigned long timeout,
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unsigned long time_to_wait)
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{
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unsigned long curr_timeout;
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for (;;) {
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curr_timeout = timeout + jiffies;
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wait_event_timeout(ses->server->response_q,
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midQ->midState != MID_REQUEST_SUBMITTED, timeout);
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if (time_after(jiffies, curr_timeout) &&
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(midQ->midState == MID_REQUEST_SUBMITTED) &&
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((ses->server->tcpStatus == CifsGood) ||
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(ses->server->tcpStatus == CifsNew))) {
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unsigned long lrt;
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/* We timed out. Is the server still
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sending replies ? */
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spin_lock(&GlobalMid_Lock);
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lrt = ses->server->lstrp;
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spin_unlock(&GlobalMid_Lock);
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/* Calculate time_to_wait past last receive time.
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Although we prefer not to time out if the
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server is still responding - we will time
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out if the server takes more than 15 (or 45
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or 180) seconds to respond to this request
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and has not responded to any request from
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other threads on the client within 10 seconds */
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lrt += time_to_wait;
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if (time_after(jiffies, lrt)) {
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/* No replies for time_to_wait. */
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cERROR(1, ("server not responding"));
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return -1;
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}
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} else {
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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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*
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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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}
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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 */,
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const int flags)
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{
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int rc = 0;
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int long_op;
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unsigned int receive_len;
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unsigned long timeout;
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struct mid_q_entry *midQ;
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struct smb_hdr *in_buf = iov[0].iov_base;
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long_op = flags & CIFS_TIMEOUT_MASK;
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*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
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if ((ses == NULL) || (ses->server == NULL)) {
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cifs_small_buf_release(in_buf);
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cERROR(1, ("Null session"));
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return -EIO;
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}
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if (ses->server->tcpStatus == CifsExiting) {
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cifs_small_buf_release(in_buf);
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return -ENOENT;
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}
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/* Ensure that we do not send more than 50 overlapping requests
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to the same server. We may make this configurable later or
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use ses->maxReq */
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rc = wait_for_free_request(ses, long_op);
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if (rc) {
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cifs_small_buf_release(in_buf);
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return rc;
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}
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|
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/* make sure that we sign in the same order that we send on this socket
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and avoid races inside tcp sendmsg code that could cause corruption
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of smb data */
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mutex_lock(&ses->server->srv_mutex);
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rc = allocate_mid(ses, in_buf, &midQ);
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if (rc) {
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mutex_unlock(&ses->server->srv_mutex);
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cifs_small_buf_release(in_buf);
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/* Update # of requests on wire to server */
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atomic_dec(&ses->server->inFlight);
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wake_up(&ses->server->request_q);
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return rc;
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}
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rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
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if (rc) {
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mutex_unlock(&ses->server->srv_mutex);
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cifs_small_buf_release(in_buf);
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goto out;
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}
|
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|
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midQ->midState = MID_REQUEST_SUBMITTED;
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&ses->server->inSend);
|
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#endif
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rc = smb_sendv(ses->server, iov, n_vec);
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#ifdef CONFIG_CIFS_STATS2
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atomic_dec(&ses->server->inSend);
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midQ->when_sent = jiffies;
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#endif
|
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|
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mutex_unlock(&ses->server->srv_mutex);
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cifs_small_buf_release(in_buf);
|
|
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
if (long_op == CIFS_STD_OP)
|
|
timeout = 15 * HZ;
|
|
else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
|
|
timeout = 180 * HZ;
|
|
else if (long_op == CIFS_LONG_OP)
|
|
timeout = 45 * HZ; /* should be greater than
|
|
servers oplock break timeout (about 43 seconds) */
|
|
else if (long_op == CIFS_ASYNC_OP)
|
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goto out;
|
|
else if (long_op == CIFS_BLOCKING_OP)
|
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timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */
|
|
else {
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cERROR(1, ("unknown timeout flag %d", long_op));
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
|
due to last connection to this server being unmounted */
|
|
if (signal_pending(current)) {
|
|
/* if signal pending do not hold up user for full smb timeout
|
|
but we still give response a chance to complete */
|
|
timeout = 2 * HZ;
|
|
}
|
|
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
|
wait_for_response(ses, midQ, timeout, 10 * HZ);
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
|
|
if (midQ->resp_buf == NULL) {
|
|
cERROR(1, ("No response to cmd %d mid %d",
|
|
midQ->command, midQ->mid));
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
rc = -EHOSTDOWN;
|
|
else {
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
|
midQ->midState = MID_RETRY_NEEDED;
|
|
}
|
|
}
|
|
|
|
if (rc != -EHOSTDOWN) {
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
|
rc = -EAGAIN;
|
|
cFYI(1, ("marking request for retry"));
|
|
} else {
|
|
rc = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteMidQEntry(midQ);
|
|
/* Update # of requests on wire to server */
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
|
|
spin_unlock(&GlobalMid_Lock);
|
|
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->mac_signing_key,
|
|
midQ->sequence_number+1);
|
|
if (rc) {
|
|
cERROR(1, ("Unexpected SMB signature"));
|
|
/* BB FIXME add code to kill session */
|
|
}
|
|
}
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
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
|
|
DeleteMidQEntry */
|
|
} else {
|
|
rc = -EIO;
|
|
cFYI(1, ("Bad MID state?"));
|
|
}
|
|
|
|
out:
|
|
DeleteMidQEntry(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;
|
|
unsigned long timeout;
|
|
struct mid_q_entry *midQ;
|
|
|
|
if (ses == NULL) {
|
|
cERROR(1, ("Null smb session"));
|
|
return -EIO;
|
|
}
|
|
if (ses->server == NULL) {
|
|
cERROR(1, ("Null tcp session"));
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
return -ENOENT;
|
|
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
|
to the same server. We may make this configurable later or
|
|
use ses->maxReq */
|
|
|
|
if (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, 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_STD_OP)
|
|
timeout = 15 * HZ;
|
|
/* wait for 15 seconds or until woken up due to response arriving or
|
|
due to last connection to this server being unmounted */
|
|
else if (long_op == CIFS_ASYNC_OP)
|
|
goto out;
|
|
else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
|
|
timeout = 180 * HZ;
|
|
else if (long_op == CIFS_LONG_OP)
|
|
timeout = 45 * HZ; /* should be greater than
|
|
servers oplock break timeout (about 43 seconds) */
|
|
else if (long_op == CIFS_BLOCKING_OP)
|
|
timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
|
|
else {
|
|
cERROR(1, ("unknown timeout flag %d", long_op));
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
/* if signal pending do not hold up user for full smb timeout
|
|
but we still give response a chance to complete */
|
|
timeout = 2 * HZ;
|
|
}
|
|
|
|
/* No user interrupts in wait - wreaks havoc with performance */
|
|
wait_for_response(ses, midQ, timeout, 10 * HZ);
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->resp_buf == NULL) {
|
|
cERROR(1, ("No response for cmd %d mid %d",
|
|
midQ->command, midQ->mid));
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
rc = -EHOSTDOWN;
|
|
else {
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
|
midQ->midState = MID_RETRY_NEEDED;
|
|
}
|
|
}
|
|
|
|
if (rc != -EHOSTDOWN) {
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
|
rc = -EAGAIN;
|
|
cFYI(1, ("marking request for retry"));
|
|
} else {
|
|
rc = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteMidQEntry(midQ);
|
|
/* Update # of requests on wire to server */
|
|
atomic_dec(&ses->server->inFlight);
|
|
wake_up(&ses->server->request_q);
|
|
return rc;
|
|
}
|
|
|
|
spin_unlock(&GlobalMid_Lock);
|
|
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->mac_signing_key,
|
|
midQ->sequence_number+1);
|
|
if (rc) {
|
|
cERROR(1, ("Unexpected SMB signature"));
|
|
/* BB FIXME add code to kill session */
|
|
}
|
|
}
|
|
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
rc = map_smb_to_linux_error(out_buf, 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:
|
|
DeleteMidQEntry(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, 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) {
|
|
DeleteMidQEntry(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) {
|
|
DeleteMidQEntry(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) {
|
|
DeleteMidQEntry(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) {
|
|
DeleteMidQEntry(midQ);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* Wait 5 seconds for the response. */
|
|
if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) {
|
|
/* We got the response - restart system call. */
|
|
rstart = 1;
|
|
}
|
|
}
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->resp_buf) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
receive_len = midQ->resp_buf->smb_buf_length;
|
|
} else {
|
|
cERROR(1, ("No response for cmd %d mid %d",
|
|
midQ->command, midQ->mid));
|
|
if (midQ->midState == MID_REQUEST_SUBMITTED) {
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
rc = -EHOSTDOWN;
|
|
else {
|
|
ses->server->tcpStatus = CifsNeedReconnect;
|
|
midQ->midState = MID_RETRY_NEEDED;
|
|
}
|
|
}
|
|
|
|
if (rc != -EHOSTDOWN) {
|
|
if (midQ->midState == MID_RETRY_NEEDED) {
|
|
rc = -EAGAIN;
|
|
cFYI(1, ("marking request for retry"));
|
|
} else {
|
|
rc = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteMidQEntry(midQ);
|
|
return rc;
|
|
}
|
|
|
|
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
|
|
cERROR(1, ("Frame too large received. Length: %d Xid: %d",
|
|
receive_len, xid));
|
|
rc = -EIO;
|
|
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->mac_signing_key,
|
|
midQ->sequence_number+1);
|
|
if (rc) {
|
|
cERROR(1, ("Unexpected SMB signature"));
|
|
/* BB FIXME add code to kill session */
|
|
}
|
|
}
|
|
|
|
*pbytes_returned = out_buf->smb_buf_length;
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
rc = map_smb_to_linux_error(out_buf, 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:
|
|
DeleteMidQEntry(midQ);
|
|
if (rstart && rc == -EACCES)
|
|
return -ERESTARTSYS;
|
|
return rc;
|
|
}
|