Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/transport.c |
| 3 | * |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
Steve French | 14a441a2b | 2006-07-16 04:32:51 +0000 | [diff] [blame] | 6 | * Jeremy Allison (jra@samba.org) 2006. |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * This library is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU Lesser General Public License as published |
| 10 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This library is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 16 | * the GNU Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public License |
| 19 | * along with this library; if not, write to the Free Software |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/list.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/wait.h> |
| 27 | #include <linux/net.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/processor.h> |
| 31 | #include <linux/mempool.h> |
| 32 | #include "cifspdu.h" |
| 33 | #include "cifsglob.h" |
| 34 | #include "cifsproto.h" |
| 35 | #include "cifs_debug.h" |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | extern mempool_t *cifs_mid_poolp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static struct mid_q_entry * |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | struct mid_q_entry *temp; |
| 43 | |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 44 | if (server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 45 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | return NULL; |
| 47 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 48 | |
Pekka Enberg | 232087c | 2008-09-15 13:22:54 +0300 | [diff] [blame] | 49 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (temp == NULL) |
| 51 | return temp; |
| 52 | else { |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 53 | memset(temp, 0, sizeof(struct mid_q_entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 55 | temp->pid = current->pid; |
| 56 | temp->command = smb_buffer->Command; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 57 | cFYI(1, "For smb_command %d", temp->command); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| 59 | /* when mid allocated can be before when sent */ |
| 60 | temp->when_alloc = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | temp->tsk = current; |
| 62 | } |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | atomic_inc(&midCount); |
| 65 | temp->midState = MID_REQUEST_ALLOCATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | return temp; |
| 67 | } |
| 68 | |
| 69 | static void |
| 70 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 71 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 72 | #ifdef CONFIG_CIFS_STATS2 |
| 73 | unsigned long now; |
| 74 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | midEntry->midState = MID_FREE; |
Jeff Layton | 8097531 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 76 | atomic_dec(&midCount); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 77 | if (midEntry->largeBuf) |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 78 | cifs_buf_release(midEntry->resp_buf); |
| 79 | else |
| 80 | cifs_small_buf_release(midEntry->resp_buf); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 81 | #ifdef CONFIG_CIFS_STATS2 |
| 82 | now = jiffies; |
| 83 | /* commands taking longer than one second are indications that |
| 84 | something is wrong, unless it is quite a slow link or server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 85 | if ((now - midEntry->when_alloc) > HZ) { |
| 86 | if ((cifsFYI & CIFS_TIMER) && |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 87 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
| 88 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", |
| 89 | midEntry->command, midEntry->mid); |
| 90 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 91 | now - midEntry->when_alloc, |
| 92 | now - midEntry->when_sent, |
| 93 | now - midEntry->when_received); |
| 94 | } |
| 95 | } |
| 96 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | mempool_free(midEntry, cifs_mid_poolp); |
| 98 | } |
| 99 | |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 100 | static void |
| 101 | delete_mid(struct mid_q_entry *mid) |
| 102 | { |
| 103 | spin_lock(&GlobalMid_Lock); |
| 104 | list_del(&mid->qhead); |
| 105 | spin_unlock(&GlobalMid_Lock); |
| 106 | |
| 107 | DeleteMidQEntry(mid); |
| 108 | } |
| 109 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 110 | static int |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 111 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | int rc = 0; |
| 114 | int i = 0; |
| 115 | struct msghdr smb_msg; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 116 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
| 117 | unsigned int len = iov[0].iov_len; |
| 118 | unsigned int total_len; |
| 119 | int first_vec = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 120 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 121 | struct socket *ssocket = server->ssocket; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 122 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 123 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 125 | |
Pavel Shilovsky | a9f1b85 | 2010-12-13 19:08:35 +0300 | [diff] [blame] | 126 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 127 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | smb_msg.msg_control = NULL; |
| 129 | smb_msg.msg_controllen = 0; |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 130 | if (server->noblocksnd) |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 131 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 132 | else |
| 133 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* smb header is converted in header_assemble. bcc and rest of SMB word |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 136 | area, and byte area if necessary, is converted to littleendian in |
| 137 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | Flags2 is converted in SendReceive */ |
| 139 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 140 | |
| 141 | total_len = 0; |
| 142 | for (i = 0; i < n_vec; i++) |
| 143 | total_len += iov[i].iov_len; |
| 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 146 | cFYI(1, "Sending smb: total_len %d", total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | dump_smb(smb_buffer, len); |
| 148 | |
Shirish Pargaonkar | 1768035 | 2008-07-29 21:26:13 +0000 | [diff] [blame] | 149 | i = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 150 | while (total_len) { |
| 151 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
| 152 | n_vec - first_vec, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 154 | i++; |
Steve French | da505c3 | 2009-01-19 03:49:35 +0000 | [diff] [blame] | 155 | /* if blocking send we try 3 times, since each can block |
| 156 | for 5 seconds. For nonblocking we have to try more |
| 157 | but wait increasing amounts of time allowing time for |
| 158 | socket to clear. The overall time we wait in either |
| 159 | case to send on the socket is about 15 seconds. |
| 160 | Similarly we wait for 15 seconds for |
| 161 | a response from the server in SendReceive[2] |
| 162 | for the server to send a response back for |
| 163 | most types of requests (except SMB Write |
| 164 | past end of file which can be slow, and |
| 165 | blocking lock operations). NFS waits slightly longer |
| 166 | than CIFS, but this can make it take longer for |
| 167 | nonresponsive servers to be detected and 15 seconds |
| 168 | is more than enough time for modern networks to |
| 169 | send a packet. In most cases if we fail to send |
| 170 | after the retries we will kill the socket and |
| 171 | reconnect which may clear the network problem. |
| 172 | */ |
| 173 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 174 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
| 175 | ssocket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | rc = -EAGAIN; |
| 177 | break; |
| 178 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 179 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | continue; |
| 181 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 182 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 184 | |
Steve French | 61de800 | 2008-10-30 20:15:22 +0000 | [diff] [blame] | 185 | if (rc == total_len) { |
| 186 | total_len = 0; |
| 187 | break; |
| 188 | } else if (rc > total_len) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 189 | cERROR(1, "sent %d requested %d", rc, total_len); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 190 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 191 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 192 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 193 | /* should never happen, letting socket clear before |
| 194 | retrying is our only obvious option here */ |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 195 | cERROR(1, "tcp sent no data"); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 196 | msleep(500); |
| 197 | continue; |
| 198 | } |
| 199 | total_len -= rc; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 200 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 201 | for (i = first_vec; i < n_vec; i++) { |
| 202 | if (iov[i].iov_len) { |
| 203 | if (rc > iov[i].iov_len) { |
| 204 | rc -= iov[i].iov_len; |
| 205 | iov[i].iov_len = 0; |
| 206 | } else { |
| 207 | iov[i].iov_base += rc; |
| 208 | iov[i].iov_len -= rc; |
| 209 | first_vec = i; |
| 210 | break; |
| 211 | } |
| 212 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 213 | } |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 214 | i = 0; /* in case we get ENOSPC on the next send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 217 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 218 | cFYI(1, "partial send (%d remaining), terminating session", |
| 219 | total_len); |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 220 | /* If we have only sent part of an SMB then the next SMB |
| 221 | could be taken as the remainder of this one. We need |
| 222 | to kill the socket so the server throws away the partial |
| 223 | SMB */ |
| 224 | server->tcpStatus = CifsNeedReconnect; |
| 225 | } |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | if (rc < 0) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 228 | cERROR(1, "Error %d sending data on socket to server", rc); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 229 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 232 | /* Don't want to modify the buffer as a |
| 233 | side effect of this call. */ |
| 234 | smb_buffer->smb_buf_length = smb_buf_length; |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | return rc; |
| 237 | } |
| 238 | |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 239 | int |
| 240 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, |
| 241 | unsigned int smb_buf_length) |
| 242 | { |
| 243 | struct kvec iov; |
| 244 | |
| 245 | iov.iov_base = smb_buffer; |
| 246 | iov.iov_len = smb_buf_length + 4; |
| 247 | |
| 248 | return smb_sendv(server, &iov, 1); |
| 249 | } |
| 250 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 251 | static int wait_for_free_request(struct TCP_Server_Info *server, |
| 252 | const int long_op) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 253 | { |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 254 | if (long_op == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 255 | /* oplock breaks must not be held up */ |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 256 | atomic_inc(&server->inFlight); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 257 | return 0; |
| 258 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 259 | |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 260 | spin_lock(&GlobalMid_Lock); |
| 261 | while (1) { |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 262 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 263 | spin_unlock(&GlobalMid_Lock); |
| 264 | #ifdef CONFIG_CIFS_STATS2 |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 265 | atomic_inc(&server->num_waiters); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 266 | #endif |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 267 | wait_event(server->request_q, |
| 268 | atomic_read(&server->inFlight) |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 269 | < cifs_max_pending); |
| 270 | #ifdef CONFIG_CIFS_STATS2 |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 271 | atomic_dec(&server->num_waiters); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 272 | #endif |
| 273 | spin_lock(&GlobalMid_Lock); |
| 274 | } else { |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 275 | if (server->tcpStatus == CifsExiting) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 276 | spin_unlock(&GlobalMid_Lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 277 | return -ENOENT; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 278 | } |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 279 | |
| 280 | /* can not count locking commands against total |
| 281 | as they are allowed to block on server */ |
| 282 | |
| 283 | /* update # of requests on the wire to server */ |
| 284 | if (long_op != CIFS_BLOCKING_OP) |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 285 | atomic_inc(&server->inFlight); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 286 | spin_unlock(&GlobalMid_Lock); |
| 287 | break; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 288 | } |
| 289 | } |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
| 294 | struct mid_q_entry **ppmidQ) |
| 295 | { |
| 296 | if (ses->server->tcpStatus == CifsExiting) { |
| 297 | return -ENOENT; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | if (ses->server->tcpStatus == CifsNeedReconnect) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 301 | cFYI(1, "tcp session dead - return to caller to retry"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 302 | return -EAGAIN; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | if (ses->status != CifsGood) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 306 | /* check if SMB session is bad because we are setting it up */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 307 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 308 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 309 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 310 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 311 | } |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 312 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 313 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 314 | return -ENOMEM; |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 315 | spin_lock(&GlobalMid_Lock); |
| 316 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); |
| 317 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 318 | return 0; |
| 319 | } |
| 320 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 321 | static int |
| 322 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 323 | { |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 324 | int error; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 325 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 326 | error = wait_event_killable(server->response_q, |
| 327 | midQ->midState != MID_REQUEST_SUBMITTED); |
| 328 | if (error < 0) |
| 329 | return -ERESTARTSYS; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 330 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 331 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 332 | } |
| 333 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 334 | |
| 335 | /* |
| 336 | * |
| 337 | * Send an SMB Request. No response info (other than return code) |
| 338 | * needs to be parsed. |
| 339 | * |
| 340 | * flags indicate the type of request buffer and how long to wait |
| 341 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 342 | * |
| 343 | */ |
| 344 | int |
| 345 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, |
| 346 | struct smb_hdr *in_buf, int flags) |
| 347 | { |
| 348 | int rc; |
| 349 | struct kvec iov[1]; |
| 350 | int resp_buf_type; |
| 351 | |
| 352 | iov[0].iov_base = (char *)in_buf; |
| 353 | iov[0].iov_len = in_buf->smb_buf_length + 4; |
| 354 | flags |= CIFS_NO_RESP; |
| 355 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 356 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 357 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 358 | return rc; |
| 359 | } |
| 360 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 361 | static int |
| 362 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
| 363 | { |
| 364 | int rc = 0; |
| 365 | |
| 366 | spin_lock(&GlobalMid_Lock); |
| 367 | |
| 368 | if (mid->resp_buf) { |
| 369 | spin_unlock(&GlobalMid_Lock); |
| 370 | return rc; |
| 371 | } |
| 372 | |
| 373 | cERROR(1, "No response to cmd %d mid %d", mid->command, mid->mid); |
| 374 | if (mid->midState == MID_REQUEST_SUBMITTED) { |
| 375 | if (server->tcpStatus == CifsExiting) |
| 376 | rc = -EHOSTDOWN; |
| 377 | else { |
| 378 | server->tcpStatus = CifsNeedReconnect; |
| 379 | mid->midState = MID_RETRY_NEEDED; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | if (rc != -EHOSTDOWN) { |
| 384 | if (mid->midState == MID_RETRY_NEEDED) { |
| 385 | rc = -EAGAIN; |
| 386 | cFYI(1, "marking request for retry"); |
| 387 | } else { |
| 388 | rc = -EIO; |
| 389 | } |
| 390 | } |
| 391 | spin_unlock(&GlobalMid_Lock); |
| 392 | |
| 393 | delete_mid(mid); |
| 394 | return rc; |
| 395 | } |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | int |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 398 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
| 399 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 400 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | { |
| 402 | int rc = 0; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 403 | int long_op; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 404 | unsigned int receive_len; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 405 | struct mid_q_entry *midQ; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 406 | struct smb_hdr *in_buf = iov[0].iov_base; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 407 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 408 | long_op = flags & CIFS_TIMEOUT_MASK; |
| 409 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 410 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 412 | if ((ses == NULL) || (ses->server == NULL)) { |
| 413 | cifs_small_buf_release(in_buf); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 414 | cERROR(1, "Null session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | return -EIO; |
| 416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 418 | if (ses->server->tcpStatus == CifsExiting) { |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 419 | cifs_small_buf_release(in_buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 420 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 421 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 422 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 423 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | to the same server. We may make this configurable later or |
| 425 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 427 | rc = wait_for_free_request(ses->server, long_op); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 428 | if (rc) { |
| 429 | cifs_small_buf_release(in_buf); |
| 430 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 432 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 433 | /* make sure that we sign in the same order that we send on this socket |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | and avoid races inside tcp sendmsg code that could cause corruption |
| 435 | of smb data */ |
| 436 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 437 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 439 | rc = allocate_mid(ses, in_buf, &midQ); |
| 440 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 441 | mutex_unlock(&ses->server->srv_mutex); |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 442 | cifs_small_buf_release(in_buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 443 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 444 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 445 | wake_up(&ses->server->request_q); |
| 446 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 448 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 449 | if (rc) { |
| 450 | mutex_unlock(&ses->server->srv_mutex); |
| 451 | cifs_small_buf_release(in_buf); |
| 452 | goto out; |
| 453 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 456 | #ifdef CONFIG_CIFS_STATS2 |
| 457 | atomic_inc(&ses->server->inSend); |
| 458 | #endif |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 459 | rc = smb_sendv(ses->server, iov, n_vec); |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 460 | #ifdef CONFIG_CIFS_STATS2 |
| 461 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 462 | midQ->when_sent = jiffies; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 463 | #endif |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 464 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 465 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 466 | cifs_small_buf_release(in_buf); |
| 467 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 468 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 469 | goto out; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 470 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 471 | if (long_op == CIFS_ASYNC_OP) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 472 | goto out; |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 473 | |
| 474 | rc = wait_for_response(ses->server, midQ); |
| 475 | if (rc != 0) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 476 | goto out; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 477 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 478 | rc = sync_mid_result(midQ, ses->server); |
| 479 | if (rc != 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 480 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 481 | wake_up(&ses->server->request_q); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 482 | return rc; |
| 483 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 484 | |
Volker Lendecke | 8e4f2e8 | 2008-12-06 16:22:15 +0100 | [diff] [blame] | 485 | receive_len = midQ->resp_buf->smb_buf_length; |
| 486 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 487 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 488 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
| 489 | receive_len, xid); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 490 | rc = -EIO; |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 491 | goto out; |
| 492 | } |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 493 | |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 494 | /* rcvd frame is ok */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 495 | |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 496 | if (midQ->resp_buf && |
| 497 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 498 | |
| 499 | iov[0].iov_base = (char *)midQ->resp_buf; |
| 500 | if (midQ->largeBuf) |
| 501 | *pRespBufType = CIFS_LARGE_BUFFER; |
| 502 | else |
| 503 | *pRespBufType = CIFS_SMALL_BUFFER; |
| 504 | iov[0].iov_len = receive_len + 4; |
| 505 | |
| 506 | dump_smb(midQ->resp_buf, 80); |
| 507 | /* convert the length into a more usable form */ |
| 508 | if ((receive_len > 24) && |
| 509 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 510 | SECMODE_SIGN_ENABLED))) { |
| 511 | rc = cifs_verify_signature(midQ->resp_buf, |
Shirish Pargaonkar | 21e7339 | 2010-10-21 06:42:55 -0500 | [diff] [blame] | 512 | ses->server, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 513 | midQ->sequence_number+1); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 514 | if (rc) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 515 | cERROR(1, "Unexpected SMB signature"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 516 | /* BB FIXME add code to kill session */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 517 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 518 | } |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 519 | |
| 520 | /* BB special case reconnect tid and uid here? */ |
| 521 | rc = map_smb_to_linux_error(midQ->resp_buf, |
| 522 | flags & CIFS_LOG_ERROR); |
| 523 | |
| 524 | /* convert ByteCount if necessary */ |
| 525 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 526 | /* do not count RFC1001 header */ + |
| 527 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
| 528 | BCC(midQ->resp_buf) = |
| 529 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
| 530 | if ((flags & CIFS_NO_RESP) == 0) |
| 531 | midQ->resp_buf = NULL; /* mark it so buf will |
| 532 | not be freed by |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 533 | delete_mid */ |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 534 | } else { |
| 535 | rc = -EIO; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 536 | cFYI(1, "Bad MID state?"); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 537 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 538 | |
| 539 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 540 | delete_mid(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 541 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 542 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 544 | return rc; |
| 545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | int |
| 548 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, |
| 549 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 550 | int *pbytes_returned, const int long_op) |
| 551 | { |
| 552 | int rc = 0; |
| 553 | unsigned int receive_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | struct mid_q_entry *midQ; |
| 555 | |
| 556 | if (ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 557 | cERROR(1, "Null smb session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | return -EIO; |
| 559 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 560 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 561 | cERROR(1, "Null tcp session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | return -EIO; |
| 563 | } |
| 564 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 565 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 566 | return -ENOENT; |
| 567 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 568 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | to the same server. We may make this configurable later or |
| 570 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 572 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 573 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
| 574 | in_buf->smb_buf_length); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 575 | return -EIO; |
| 576 | } |
| 577 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 578 | rc = wait_for_free_request(ses->server, long_op); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 579 | if (rc) |
| 580 | return rc; |
| 581 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 582 | /* make sure that we sign in the same order that we send on this socket |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | and avoid races inside tcp sendmsg code that could cause corruption |
| 584 | of smb data */ |
| 585 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 586 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 588 | rc = allocate_mid(ses, in_buf, &midQ); |
| 589 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 590 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 591 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 592 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 593 | wake_up(&ses->server->request_q); |
| 594 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 597 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 598 | if (rc) { |
| 599 | mutex_unlock(&ses->server->srv_mutex); |
| 600 | goto out; |
| 601 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
| 603 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 604 | #ifdef CONFIG_CIFS_STATS2 |
| 605 | atomic_inc(&ses->server->inSend); |
| 606 | #endif |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 607 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 608 | #ifdef CONFIG_CIFS_STATS2 |
| 609 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 610 | midQ->when_sent = jiffies; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 611 | #endif |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 612 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 613 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 614 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 615 | goto out; |
| 616 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 617 | if (long_op == CIFS_ASYNC_OP) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 618 | goto out; |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 619 | |
| 620 | rc = wait_for_response(ses->server, midQ); |
| 621 | if (rc != 0) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 622 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 624 | rc = sync_mid_result(midQ, ses->server); |
| 625 | if (rc != 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 626 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 627 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return rc; |
| 629 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 630 | |
Volker Lendecke | 8e4f2e8 | 2008-12-06 16:22:15 +0100 | [diff] [blame] | 631 | receive_len = midQ->resp_buf->smb_buf_length; |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 634 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
| 635 | receive_len, xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | rc = -EIO; |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 637 | goto out; |
| 638 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 640 | /* rcvd frame is ok */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 642 | if (midQ->resp_buf && out_buf |
| 643 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 644 | out_buf->smb_buf_length = receive_len; |
| 645 | memcpy((char *)out_buf + 4, |
| 646 | (char *)midQ->resp_buf + 4, |
| 647 | receive_len); |
| 648 | |
| 649 | dump_smb(out_buf, 92); |
| 650 | /* convert the length into a more usable form */ |
| 651 | if ((receive_len > 24) && |
| 652 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 653 | SECMODE_SIGN_ENABLED))) { |
| 654 | rc = cifs_verify_signature(out_buf, |
Shirish Pargaonkar | 21e7339 | 2010-10-21 06:42:55 -0500 | [diff] [blame] | 655 | ses->server, |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 656 | midQ->sequence_number+1); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 657 | if (rc) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 658 | cERROR(1, "Unexpected SMB signature"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 659 | /* BB FIXME add code to kill session */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 662 | |
| 663 | *pbytes_returned = out_buf->smb_buf_length; |
| 664 | |
| 665 | /* BB special case reconnect tid and uid here? */ |
| 666 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
| 667 | |
| 668 | /* convert ByteCount if necessary */ |
| 669 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 670 | /* do not count RFC1001 header */ + |
| 671 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| 672 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| 673 | } else { |
| 674 | rc = -EIO; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 675 | cERROR(1, "Bad MID state?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 678 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 679 | delete_mid(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 680 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 681 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 684 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 686 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
| 687 | |
| 688 | static int |
| 689 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, |
| 690 | struct mid_q_entry *midQ) |
| 691 | { |
| 692 | int rc = 0; |
| 693 | struct cifsSesInfo *ses = tcon->ses; |
| 694 | __u16 mid = in_buf->Mid; |
| 695 | |
| 696 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); |
| 697 | in_buf->Mid = mid; |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 698 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 699 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| 700 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 701 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 702 | return rc; |
| 703 | } |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 704 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 705 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 706 | return rc; |
| 707 | } |
| 708 | |
| 709 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 710 | blocking lock to return. */ |
| 711 | |
| 712 | static int |
| 713 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, |
| 714 | struct smb_hdr *in_buf, |
| 715 | struct smb_hdr *out_buf) |
| 716 | { |
| 717 | int bytes_returned; |
| 718 | struct cifsSesInfo *ses = tcon->ses; |
| 719 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 720 | |
| 721 | /* We just modify the current in_buf to change |
| 722 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 723 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 724 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 725 | |
| 726 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 727 | pSMB->Timeout = 0; |
| 728 | pSMB->hdr.Mid = GetNextMid(ses->server); |
| 729 | |
| 730 | return SendReceive(xid, ses, in_buf, out_buf, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 731 | &bytes_returned, CIFS_STD_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | int |
| 735 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, |
| 736 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 737 | int *pbytes_returned) |
| 738 | { |
| 739 | int rc = 0; |
| 740 | int rstart = 0; |
| 741 | unsigned int receive_len; |
| 742 | struct mid_q_entry *midQ; |
| 743 | struct cifsSesInfo *ses; |
| 744 | |
| 745 | if (tcon == NULL || tcon->ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 746 | cERROR(1, "Null smb session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 747 | return -EIO; |
| 748 | } |
| 749 | ses = tcon->ses; |
| 750 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 751 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 752 | cERROR(1, "Null tcp session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 753 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 756 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 757 | return -ENOENT; |
| 758 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 759 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 760 | to the same server. We may make this configurable later or |
| 761 | use ses->maxReq */ |
| 762 | |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 763 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 764 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
| 765 | in_buf->smb_buf_length); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 766 | return -EIO; |
| 767 | } |
| 768 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 769 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 770 | if (rc) |
| 771 | return rc; |
| 772 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 773 | /* make sure that we sign in the same order that we send on this socket |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 774 | and avoid races inside tcp sendmsg code that could cause corruption |
| 775 | of smb data */ |
| 776 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 777 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 778 | |
| 779 | rc = allocate_mid(ses, in_buf, &midQ); |
| 780 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 781 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 782 | return rc; |
| 783 | } |
| 784 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 785 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 786 | if (rc) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 787 | delete_mid(midQ); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 788 | mutex_unlock(&ses->server->srv_mutex); |
| 789 | return rc; |
| 790 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 791 | |
| 792 | midQ->midState = MID_REQUEST_SUBMITTED; |
| 793 | #ifdef CONFIG_CIFS_STATS2 |
| 794 | atomic_inc(&ses->server->inSend); |
| 795 | #endif |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 796 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 797 | #ifdef CONFIG_CIFS_STATS2 |
| 798 | atomic_dec(&ses->server->inSend); |
| 799 | midQ->when_sent = jiffies; |
| 800 | #endif |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 801 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 802 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 803 | if (rc < 0) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 804 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 805 | return rc; |
| 806 | } |
| 807 | |
| 808 | /* Wait for a reply - allow signals to interrupt. */ |
| 809 | rc = wait_event_interruptible(ses->server->response_q, |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 810 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 811 | ((ses->server->tcpStatus != CifsGood) && |
| 812 | (ses->server->tcpStatus != CifsNew))); |
| 813 | |
| 814 | /* Were we interrupted by a signal ? */ |
| 815 | if ((rc == -ERESTARTSYS) && |
| 816 | (midQ->midState == MID_REQUEST_SUBMITTED) && |
| 817 | ((ses->server->tcpStatus == CifsGood) || |
| 818 | (ses->server->tcpStatus == CifsNew))) { |
| 819 | |
| 820 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 821 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 822 | blocking lock to return. */ |
| 823 | |
| 824 | rc = send_nt_cancel(tcon, in_buf, midQ); |
| 825 | if (rc) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 826 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 827 | return rc; |
| 828 | } |
| 829 | } else { |
| 830 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 831 | to cause the blocking lock to return. */ |
| 832 | |
| 833 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 834 | |
| 835 | /* If we get -ENOLCK back the lock may have |
| 836 | already been removed. Don't exit in this case. */ |
| 837 | if (rc && rc != -ENOLCK) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 838 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 839 | return rc; |
| 840 | } |
| 841 | } |
| 842 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame^] | 843 | if (wait_for_response(ses->server, midQ) == 0) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 844 | /* We got the response - restart system call. */ |
| 845 | rstart = 1; |
| 846 | } |
| 847 | } |
| 848 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 849 | rc = sync_mid_result(midQ, ses->server); |
| 850 | if (rc != 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 851 | return rc; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 852 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 853 | receive_len = midQ->resp_buf->smb_buf_length; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 854 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 855 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
| 856 | receive_len, xid); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 857 | rc = -EIO; |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 858 | goto out; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 859 | } |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 860 | |
| 861 | /* rcvd frame is ok */ |
| 862 | |
Volker Lendecke | ac6a3ef | 2008-12-06 16:40:40 +0100 | [diff] [blame] | 863 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 864 | rc = -EIO; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 865 | cERROR(1, "Bad MID state?"); |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 866 | goto out; |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 867 | } |
| 868 | |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 869 | out_buf->smb_buf_length = receive_len; |
| 870 | memcpy((char *)out_buf + 4, |
| 871 | (char *)midQ->resp_buf + 4, |
| 872 | receive_len); |
| 873 | |
| 874 | dump_smb(out_buf, 92); |
| 875 | /* convert the length into a more usable form */ |
| 876 | if ((receive_len > 24) && |
| 877 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 878 | SECMODE_SIGN_ENABLED))) { |
| 879 | rc = cifs_verify_signature(out_buf, |
Shirish Pargaonkar | 21e7339 | 2010-10-21 06:42:55 -0500 | [diff] [blame] | 880 | ses->server, |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 881 | midQ->sequence_number+1); |
| 882 | if (rc) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 883 | cERROR(1, "Unexpected SMB signature"); |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 884 | /* BB FIXME add code to kill session */ |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | *pbytes_returned = out_buf->smb_buf_length; |
| 889 | |
| 890 | /* BB special case reconnect tid and uid here? */ |
| 891 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
| 892 | |
| 893 | /* convert ByteCount if necessary */ |
| 894 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 895 | /* do not count RFC1001 header */ + |
| 896 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| 897 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| 898 | |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 899 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 900 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 901 | if (rstart && rc == -EACCES) |
| 902 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | return rc; |
| 904 | } |