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> |
Jeff Layton | f06ac72 | 2011-10-19 15:30:40 -0400 | [diff] [blame] | 29 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/processor.h> |
| 32 | #include <linux/mempool.h> |
| 33 | #include "cifspdu.h" |
| 34 | #include "cifsglob.h" |
| 35 | #include "cifsproto.h" |
| 36 | #include "cifs_debug.h" |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | extern mempool_t *cifs_mid_poolp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 40 | static void |
| 41 | wake_up_task(struct mid_q_entry *mid) |
| 42 | { |
| 43 | wake_up_process(mid->callback_data); |
| 44 | } |
| 45 | |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 46 | struct mid_q_entry * |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 47 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | struct mid_q_entry *temp; |
| 50 | |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 51 | if (server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 52 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | return NULL; |
| 54 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 55 | |
Pekka Enberg | 232087c | 2008-09-15 13:22:54 +0300 | [diff] [blame] | 56 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | if (temp == NULL) |
| 58 | return temp; |
| 59 | else { |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 60 | memset(temp, 0, sizeof(struct mid_q_entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 62 | temp->pid = current->pid; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 63 | temp->command = cpu_to_le16(smb_buffer->Command); |
| 64 | cFYI(1, "For smb_command %d", smb_buffer->Command); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 65 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| 66 | /* when mid allocated can be before when sent */ |
| 67 | temp->when_alloc = jiffies; |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * The default is for the mid to be synchronous, so the |
| 71 | * default callback just wakes up the current task. |
| 72 | */ |
| 73 | temp->callback = wake_up_task; |
| 74 | temp->callback_data = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | atomic_inc(&midCount); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 78 | temp->mid_state = MID_REQUEST_ALLOCATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | return temp; |
| 80 | } |
| 81 | |
Jeff Layton | 766fdbb | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 82 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 84 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 85 | #ifdef CONFIG_CIFS_STATS2 |
| 86 | unsigned long now; |
| 87 | #endif |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 88 | midEntry->mid_state = MID_FREE; |
Jeff Layton | 8097531 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 89 | atomic_dec(&midCount); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 90 | if (midEntry->large_buf) |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 91 | cifs_buf_release(midEntry->resp_buf); |
| 92 | else |
| 93 | cifs_small_buf_release(midEntry->resp_buf); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 94 | #ifdef CONFIG_CIFS_STATS2 |
| 95 | now = jiffies; |
| 96 | /* commands taking longer than one second are indications that |
| 97 | something is wrong, unless it is quite a slow link or server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 98 | if ((now - midEntry->when_alloc) > HZ) { |
| 99 | if ((cifsFYI & CIFS_TIMER) && |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 100 | (midEntry->command != cpu_to_le16(SMB_COM_LOCKING_ANDX))) { |
| 101 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 102 | midEntry->command, midEntry->mid); |
| 103 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 104 | now - midEntry->when_alloc, |
| 105 | now - midEntry->when_sent, |
| 106 | now - midEntry->when_received); |
| 107 | } |
| 108 | } |
| 109 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | mempool_free(midEntry, cifs_mid_poolp); |
| 111 | } |
| 112 | |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 113 | static void |
| 114 | delete_mid(struct mid_q_entry *mid) |
| 115 | { |
| 116 | spin_lock(&GlobalMid_Lock); |
| 117 | list_del(&mid->qhead); |
| 118 | spin_unlock(&GlobalMid_Lock); |
| 119 | |
| 120 | DeleteMidQEntry(mid); |
| 121 | } |
| 122 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 123 | static int |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 124 | 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] | 125 | { |
| 126 | int rc = 0; |
| 127 | int i = 0; |
| 128 | struct msghdr smb_msg; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 129 | __be32 *buf_len = (__be32 *)(iov[0].iov_base); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 130 | unsigned int len = iov[0].iov_len; |
| 131 | unsigned int total_len; |
| 132 | int first_vec = 0; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 133 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 134 | struct socket *ssocket = server->ssocket; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 135 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 136 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 138 | |
Pavel Shilovsky | a9f1b85 | 2010-12-13 19:08:35 +0300 | [diff] [blame] | 139 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 140 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | smb_msg.msg_control = NULL; |
| 142 | smb_msg.msg_controllen = 0; |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 143 | if (server->noblocksnd) |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 144 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 145 | else |
| 146 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 148 | total_len = 0; |
| 149 | for (i = 0; i < n_vec; i++) |
| 150 | total_len += iov[i].iov_len; |
| 151 | |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 152 | cFYI(1, "Sending smb: total_len %d", total_len); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 153 | dump_smb(iov[0].iov_base, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Shirish Pargaonkar | 1768035 | 2008-07-29 21:26:13 +0000 | [diff] [blame] | 155 | i = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 156 | while (total_len) { |
| 157 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
| 158 | n_vec - first_vec, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 160 | i++; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 161 | /* |
| 162 | * If blocking send we try 3 times, since each can block |
| 163 | * for 5 seconds. For nonblocking we have to try more |
| 164 | * but wait increasing amounts of time allowing time for |
| 165 | * socket to clear. The overall time we wait in either |
| 166 | * case to send on the socket is about 15 seconds. |
| 167 | * Similarly we wait for 15 seconds for a response from |
| 168 | * the server in SendReceive[2] for the server to send |
| 169 | * a response back for most types of requests (except |
| 170 | * SMB Write past end of file which can be slow, and |
| 171 | * blocking lock operations). NFS waits slightly longer |
| 172 | * than CIFS, but this can make it take longer for |
| 173 | * nonresponsive servers to be detected and 15 seconds |
| 174 | * is more than enough time for modern networks to |
| 175 | * send a packet. In most cases if we fail to send |
| 176 | * after the retries we will kill the socket and |
| 177 | * reconnect which may clear the network problem. |
| 178 | */ |
Steve French | da505c3 | 2009-01-19 03:49:35 +0000 | [diff] [blame] | 179 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 180 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
| 181 | ssocket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | rc = -EAGAIN; |
| 183 | break; |
| 184 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 185 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | continue; |
| 187 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 188 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 190 | |
Steve French | 61de800 | 2008-10-30 20:15:22 +0000 | [diff] [blame] | 191 | if (rc == total_len) { |
| 192 | total_len = 0; |
| 193 | break; |
| 194 | } else if (rc > total_len) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 195 | cERROR(1, "sent %d requested %d", rc, total_len); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 196 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 197 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 198 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 199 | /* should never happen, letting socket clear before |
| 200 | retrying is our only obvious option here */ |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 201 | cERROR(1, "tcp sent no data"); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 202 | msleep(500); |
| 203 | continue; |
| 204 | } |
| 205 | total_len -= rc; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 206 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 207 | for (i = first_vec; i < n_vec; i++) { |
| 208 | if (iov[i].iov_len) { |
| 209 | if (rc > iov[i].iov_len) { |
| 210 | rc -= iov[i].iov_len; |
| 211 | iov[i].iov_len = 0; |
| 212 | } else { |
| 213 | iov[i].iov_base += rc; |
| 214 | iov[i].iov_len -= rc; |
| 215 | first_vec = i; |
| 216 | break; |
| 217 | } |
| 218 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 219 | } |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 220 | i = 0; /* in case we get ENOSPC on the next send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 223 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 224 | cFYI(1, "partial send (%d remaining), terminating session", |
| 225 | total_len); |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 226 | /* If we have only sent part of an SMB then the next SMB |
| 227 | could be taken as the remainder of this one. We need |
| 228 | to kill the socket so the server throws away the partial |
| 229 | SMB */ |
| 230 | server->tcpStatus = CifsNeedReconnect; |
| 231 | } |
| 232 | |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 233 | if (rc < 0 && rc != -EINTR) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 234 | cERROR(1, "Error %d sending data on socket to server", rc); |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 235 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 238 | /* Don't want to modify the buffer as a side effect of this call. */ |
| 239 | *buf_len = cpu_to_be32(smb_buf_length); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | return rc; |
| 242 | } |
| 243 | |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 244 | int |
| 245 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, |
| 246 | unsigned int smb_buf_length) |
| 247 | { |
| 248 | struct kvec iov; |
| 249 | |
| 250 | iov.iov_base = smb_buffer; |
| 251 | iov.iov_len = smb_buf_length + 4; |
| 252 | |
| 253 | return smb_sendv(server, &iov, 1); |
| 254 | } |
| 255 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 256 | static int |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 257 | wait_for_free_credits(struct TCP_Server_Info *server, const int optype, |
| 258 | int *credits) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 259 | { |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 260 | int rc; |
| 261 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 262 | spin_lock(&server->req_lock); |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 263 | if (optype == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 264 | /* oplock breaks must not be held up */ |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 265 | server->in_flight++; |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 266 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 267 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 268 | return 0; |
| 269 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 270 | |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 271 | while (1) { |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 272 | if (*credits <= 0) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 273 | spin_unlock(&server->req_lock); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 274 | cifs_num_waiters_inc(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 275 | rc = wait_event_killable(server->request_q, |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 276 | has_credits(server, credits)); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 277 | cifs_num_waiters_dec(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 278 | if (rc) |
| 279 | return rc; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 280 | spin_lock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 281 | } else { |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 282 | if (server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 283 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 284 | return -ENOENT; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 285 | } |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 286 | |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 287 | /* |
| 288 | * Can not count locking commands against total |
| 289 | * as they are allowed to block on server. |
| 290 | */ |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 291 | |
| 292 | /* update # of requests on the wire to server */ |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 293 | if (optype != CIFS_BLOCKING_OP) { |
| 294 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 295 | server->in_flight++; |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 296 | } |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 297 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 298 | break; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | return 0; |
| 302 | } |
| 303 | |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 304 | static int |
| 305 | wait_for_free_request(struct TCP_Server_Info *server, const int optype) |
| 306 | { |
| 307 | return wait_for_free_credits(server, optype, get_credits_field(server)); |
| 308 | } |
| 309 | |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 310 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 311 | struct mid_q_entry **ppmidQ) |
| 312 | { |
| 313 | if (ses->server->tcpStatus == CifsExiting) { |
| 314 | return -ENOENT; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | if (ses->server->tcpStatus == CifsNeedReconnect) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 318 | cFYI(1, "tcp session dead - return to caller to retry"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 319 | return -EAGAIN; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | if (ses->status != CifsGood) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 323 | /* check if SMB session is bad because we are setting it up */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 324 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 325 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 326 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 327 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 328 | } |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 329 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 330 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 331 | return -ENOMEM; |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 332 | spin_lock(&GlobalMid_Lock); |
| 333 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); |
| 334 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 335 | return 0; |
| 336 | } |
| 337 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 338 | static int |
| 339 | 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] | 340 | { |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 341 | int error; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 342 | |
Jeff Layton | f06ac72 | 2011-10-19 15:30:40 -0400 | [diff] [blame] | 343 | error = wait_event_freezekillable(server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 344 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 345 | if (error < 0) |
| 346 | return -ERESTARTSYS; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 347 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 348 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 349 | } |
| 350 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 351 | static int |
| 352 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, |
| 353 | unsigned int nvec, struct mid_q_entry **ret_mid) |
| 354 | { |
| 355 | int rc; |
| 356 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
| 357 | struct mid_q_entry *mid; |
| 358 | |
| 359 | /* enable signing if server requires it */ |
| 360 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 361 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| 362 | |
| 363 | mid = AllocMidQEntry(hdr, server); |
| 364 | if (mid == NULL) |
| 365 | return -ENOMEM; |
| 366 | |
| 367 | /* put it on the pending_mid_q */ |
| 368 | spin_lock(&GlobalMid_Lock); |
| 369 | list_add_tail(&mid->qhead, &server->pending_mid_q); |
| 370 | spin_unlock(&GlobalMid_Lock); |
| 371 | |
| 372 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); |
| 373 | if (rc) |
| 374 | delete_mid(mid); |
| 375 | *ret_mid = mid; |
| 376 | return rc; |
| 377 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 378 | |
| 379 | /* |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 380 | * Send a SMB request and set the callback function in the mid to handle |
| 381 | * the result. Caller is responsible for dealing with timeouts. |
| 382 | */ |
| 383 | int |
Jeff Layton | fcc31cb | 2011-05-19 16:22:53 -0400 | [diff] [blame] | 384 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
Jeff Layton | 44d22d8 | 2011-10-19 15:29:49 -0400 | [diff] [blame] | 385 | unsigned int nvec, mid_receive_t *receive, |
| 386 | mid_callback_t *callback, void *cbdata, bool ignore_pend) |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 387 | { |
| 388 | int rc; |
| 389 | struct mid_q_entry *mid; |
| 390 | |
Jeff Layton | 59ffd84 | 2011-05-19 16:22:55 -0400 | [diff] [blame] | 391 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 392 | if (rc) |
| 393 | return rc; |
| 394 | |
| 395 | mutex_lock(&server->srv_mutex); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 396 | rc = cifs_setup_async_request(server, iov, nvec, &mid); |
| 397 | if (rc) { |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 398 | mutex_unlock(&server->srv_mutex); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 399 | cifs_add_credits(server, 1); |
Pavel Shilovsky | 0193e07 | 2011-08-03 23:12:18 +0400 | [diff] [blame] | 400 | wake_up(&server->request_q); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 401 | return rc; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 402 | } |
| 403 | |
Jeff Layton | 44d22d8 | 2011-10-19 15:29:49 -0400 | [diff] [blame] | 404 | mid->receive = receive; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 405 | mid->callback = callback; |
| 406 | mid->callback_data = cbdata; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 407 | mid->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 408 | |
| 409 | cifs_in_send_inc(server); |
Jeff Layton | fcc31cb | 2011-05-19 16:22:53 -0400 | [diff] [blame] | 410 | rc = smb_sendv(server, iov, nvec); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 411 | cifs_in_send_dec(server); |
| 412 | cifs_save_when_sent(mid); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 413 | mutex_unlock(&server->srv_mutex); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 414 | |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 415 | if (rc) |
| 416 | goto out_err; |
| 417 | |
| 418 | return rc; |
| 419 | out_err: |
| 420 | delete_mid(mid); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 421 | cifs_add_credits(server, 1); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 422 | wake_up(&server->request_q); |
| 423 | return rc; |
| 424 | } |
| 425 | |
| 426 | /* |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 427 | * |
| 428 | * Send an SMB Request. No response info (other than return code) |
| 429 | * needs to be parsed. |
| 430 | * |
| 431 | * flags indicate the type of request buffer and how long to wait |
| 432 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 433 | * |
| 434 | */ |
| 435 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 436 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 437 | char *in_buf, int flags) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 438 | { |
| 439 | int rc; |
| 440 | struct kvec iov[1]; |
| 441 | int resp_buf_type; |
| 442 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 443 | iov[0].iov_base = in_buf; |
| 444 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 445 | flags |= CIFS_NO_RESP; |
| 446 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 447 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 448 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 449 | return rc; |
| 450 | } |
| 451 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 452 | static int |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 453 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 454 | { |
| 455 | int rc = 0; |
| 456 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 457 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
| 458 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 459 | |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 460 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 461 | switch (mid->mid_state) { |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 462 | case MID_RESPONSE_RECEIVED: |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 463 | spin_unlock(&GlobalMid_Lock); |
| 464 | return rc; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 465 | case MID_RETRY_NEEDED: |
| 466 | rc = -EAGAIN; |
| 467 | break; |
Jeff Layton | 71823ba | 2011-02-10 08:03:50 -0500 | [diff] [blame] | 468 | case MID_RESPONSE_MALFORMED: |
| 469 | rc = -EIO; |
| 470 | break; |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 471 | case MID_SHUTDOWN: |
| 472 | rc = -EHOSTDOWN; |
| 473 | break; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 474 | default: |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 475 | list_del_init(&mid->qhead); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 476 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
| 477 | mid->mid, mid->mid_state); |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 478 | rc = -EIO; |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 479 | } |
| 480 | spin_unlock(&GlobalMid_Lock); |
| 481 | |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 482 | DeleteMidQEntry(mid); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 483 | return rc; |
| 484 | } |
| 485 | |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 486 | static inline int |
| 487 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) |
Jeff Layton | 76dcc26 | 2011-01-11 07:24:24 -0500 | [diff] [blame] | 488 | { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 489 | return server->ops->send_cancel ? |
| 490 | server->ops->send_cancel(server, buf, mid) : 0; |
Jeff Layton | 76dcc26 | 2011-01-11 07:24:24 -0500 | [diff] [blame] | 491 | } |
| 492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | int |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 494 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| 495 | bool log_error) |
| 496 | { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 497 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 498 | |
| 499 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 500 | |
| 501 | /* convert the length into a more usable form */ |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 502 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 503 | struct kvec iov; |
| 504 | |
| 505 | iov.iov_base = mid->resp_buf; |
| 506 | iov.iov_len = len; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 507 | /* FIXME: add code to kill session */ |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 508 | if (cifs_verify_signature(&iov, 1, server, |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 509 | mid->sequence_number + 1) != 0) |
| 510 | cERROR(1, "Unexpected SMB signature"); |
| 511 | } |
| 512 | |
| 513 | /* BB special case reconnect tid and uid here? */ |
| 514 | return map_smb_to_linux_error(mid->resp_buf, log_error); |
| 515 | } |
| 516 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 517 | static int |
| 518 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
| 519 | unsigned int nvec, struct mid_q_entry **ret_mid) |
| 520 | { |
| 521 | int rc; |
| 522 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
| 523 | struct mid_q_entry *mid; |
| 524 | |
| 525 | rc = allocate_mid(ses, hdr, &mid); |
| 526 | if (rc) |
| 527 | return rc; |
| 528 | rc = cifs_sign_smb2(iov, nvec, ses->server, &mid->sequence_number); |
| 529 | if (rc) |
| 530 | delete_mid(mid); |
| 531 | *ret_mid = mid; |
| 532 | return rc; |
| 533 | } |
| 534 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 535 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 536 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 537 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 538 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | { |
| 540 | int rc = 0; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 541 | int long_op; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 542 | struct mid_q_entry *midQ; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 543 | char *buf = iov[0].iov_base; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 544 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 545 | long_op = flags & CIFS_TIMEOUT_MASK; |
| 546 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 547 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 549 | if ((ses == NULL) || (ses->server == NULL)) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 550 | cifs_small_buf_release(buf); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 551 | cERROR(1, "Null session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | return -EIO; |
| 553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 555 | if (ses->server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 556 | cifs_small_buf_release(buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 557 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 558 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 559 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 560 | /* |
| 561 | * Ensure that we do not send more than 50 overlapping requests |
| 562 | * to the same server. We may make this configurable later or |
| 563 | * use ses->maxReq. |
| 564 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 566 | rc = wait_for_free_request(ses->server, long_op); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 567 | if (rc) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 568 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 569 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 571 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 572 | /* |
| 573 | * Make sure that we sign in the same order that we send on this socket |
| 574 | * and avoid races inside tcp sendmsg code that could cause corruption |
| 575 | * of smb data. |
| 576 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 578 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 580 | rc = cifs_setup_request(ses, iov, n_vec, &midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 581 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 582 | mutex_unlock(&ses->server->srv_mutex); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 583 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 584 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 585 | cifs_add_credits(ses->server, 1); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 586 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 589 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 590 | cifs_in_send_inc(ses->server); |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 591 | rc = smb_sendv(ses->server, iov, n_vec); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 592 | cifs_in_send_dec(ses->server); |
| 593 | cifs_save_when_sent(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 594 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 595 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 596 | |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 597 | if (rc < 0) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 598 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 599 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 600 | } |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 601 | |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 602 | if (long_op == CIFS_ASYNC_OP) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 603 | cifs_small_buf_release(buf); |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 604 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 605 | } |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 606 | |
| 607 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 608 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 609 | send_cancel(ses->server, buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 610 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 611 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 612 | midQ->callback = DeleteMidQEntry; |
| 613 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 614 | cifs_small_buf_release(buf); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 615 | cifs_add_credits(ses->server, 1); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 616 | return rc; |
| 617 | } |
| 618 | spin_unlock(&GlobalMid_Lock); |
| 619 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 620 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 621 | cifs_small_buf_release(buf); |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 622 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 623 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 624 | if (rc != 0) { |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 625 | cifs_add_credits(ses->server, 1); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 626 | return rc; |
| 627 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 628 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 629 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 630 | rc = -EIO; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 631 | cFYI(1, "Bad MID state?"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 632 | goto out; |
| 633 | } |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 634 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 635 | buf = (char *)midQ->resp_buf; |
| 636 | iov[0].iov_base = buf; |
| 637 | iov[0].iov_len = get_rfc1002_length(buf) + 4; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 638 | if (midQ->large_buf) |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 639 | *pRespBufType = CIFS_LARGE_BUFFER; |
| 640 | else |
| 641 | *pRespBufType = CIFS_SMALL_BUFFER; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 642 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 643 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 644 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 645 | /* mark it so buf will not be freed by delete_mid */ |
| 646 | if ((flags & CIFS_NO_RESP) == 0) |
| 647 | midQ->resp_buf = NULL; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 648 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 649 | delete_mid(midQ); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 650 | cifs_add_credits(ses->server, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | return rc; |
| 653 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 656 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 658 | int *pbytes_returned, const int long_op) |
| 659 | { |
| 660 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | struct mid_q_entry *midQ; |
| 662 | |
| 663 | if (ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 664 | cERROR(1, "Null smb session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return -EIO; |
| 666 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 667 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 668 | cERROR(1, "Null tcp session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | return -EIO; |
| 670 | } |
| 671 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 672 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 673 | return -ENOENT; |
| 674 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 675 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | to the same server. We may make this configurable later or |
| 677 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 679 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 680 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 681 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 682 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 683 | return -EIO; |
| 684 | } |
| 685 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 686 | rc = wait_for_free_request(ses->server, long_op); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 687 | if (rc) |
| 688 | return rc; |
| 689 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 690 | /* 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] | 691 | and avoid races inside tcp sendmsg code that could cause corruption |
| 692 | of smb data */ |
| 693 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 694 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 696 | rc = allocate_mid(ses, in_buf, &midQ); |
| 697 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 698 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 699 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 700 | cifs_add_credits(ses->server, 1); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 701 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 704 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 705 | if (rc) { |
| 706 | mutex_unlock(&ses->server->srv_mutex); |
| 707 | goto out; |
| 708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 710 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 711 | |
| 712 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 713 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 714 | cifs_in_send_dec(ses->server); |
| 715 | cifs_save_when_sent(midQ); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 716 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 717 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 718 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 719 | goto out; |
| 720 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 721 | if (long_op == CIFS_ASYNC_OP) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 722 | goto out; |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 723 | |
| 724 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 725 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 726 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 727 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 728 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 729 | /* no longer considered to be "in-flight" */ |
| 730 | midQ->callback = DeleteMidQEntry; |
| 731 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 732 | cifs_add_credits(ses->server, 1); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 733 | return rc; |
| 734 | } |
| 735 | spin_unlock(&GlobalMid_Lock); |
| 736 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 738 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 739 | if (rc != 0) { |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 740 | cifs_add_credits(ses->server, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | return rc; |
| 742 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 743 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 744 | if (!midQ->resp_buf || !out_buf || |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 745 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | rc = -EIO; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 747 | cERROR(1, "Bad MID state?"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 748 | goto out; |
| 749 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 751 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 752 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 753 | rc = cifs_check_receive(midQ, ses->server, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 754 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 755 | delete_mid(midQ); |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 756 | cifs_add_credits(ses->server, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 761 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 762 | blocking lock to return. */ |
| 763 | |
| 764 | static int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 765 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 766 | struct smb_hdr *in_buf, |
| 767 | struct smb_hdr *out_buf) |
| 768 | { |
| 769 | int bytes_returned; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 770 | struct cifs_ses *ses = tcon->ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 771 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 772 | |
| 773 | /* We just modify the current in_buf to change |
| 774 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 775 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 776 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 777 | |
| 778 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 779 | pSMB->Timeout = 0; |
| 780 | pSMB->hdr.Mid = GetNextMid(ses->server); |
| 781 | |
| 782 | return SendReceive(xid, ses, in_buf, out_buf, |
Jeff Layton | 7749981 | 2011-01-11 07:24:23 -0500 | [diff] [blame] | 783 | &bytes_returned, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 787 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 788 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 789 | int *pbytes_returned) |
| 790 | { |
| 791 | int rc = 0; |
| 792 | int rstart = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 793 | struct mid_q_entry *midQ; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 794 | struct cifs_ses *ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 795 | |
| 796 | if (tcon == NULL || tcon->ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 797 | cERROR(1, "Null smb session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 798 | return -EIO; |
| 799 | } |
| 800 | ses = tcon->ses; |
| 801 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 802 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 803 | cERROR(1, "Null tcp session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 804 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 807 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 808 | return -ENOENT; |
| 809 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 810 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 811 | to the same server. We may make this configurable later or |
| 812 | use ses->maxReq */ |
| 813 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 814 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 815 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 816 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 817 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 818 | return -EIO; |
| 819 | } |
| 820 | |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 821 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 822 | if (rc) |
| 823 | return rc; |
| 824 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 825 | /* 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] | 826 | and avoid races inside tcp sendmsg code that could cause corruption |
| 827 | of smb data */ |
| 828 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 829 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 830 | |
| 831 | rc = allocate_mid(ses, in_buf, &midQ); |
| 832 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 833 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 834 | return rc; |
| 835 | } |
| 836 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 837 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 838 | if (rc) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 839 | delete_mid(midQ); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 840 | mutex_unlock(&ses->server->srv_mutex); |
| 841 | return rc; |
| 842 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 843 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 844 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 845 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 846 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 847 | cifs_in_send_dec(ses->server); |
| 848 | cifs_save_when_sent(midQ); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 849 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 850 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 851 | if (rc < 0) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 852 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 853 | return rc; |
| 854 | } |
| 855 | |
| 856 | /* Wait for a reply - allow signals to interrupt. */ |
| 857 | rc = wait_event_interruptible(ses->server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 858 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 859 | ((ses->server->tcpStatus != CifsGood) && |
| 860 | (ses->server->tcpStatus != CifsNew))); |
| 861 | |
| 862 | /* Were we interrupted by a signal ? */ |
| 863 | if ((rc == -ERESTARTSYS) && |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 864 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 865 | ((ses->server->tcpStatus == CifsGood) || |
| 866 | (ses->server->tcpStatus == CifsNew))) { |
| 867 | |
| 868 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 869 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 870 | blocking lock to return. */ |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 871 | rc = send_cancel(ses->server, in_buf, midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 872 | if (rc) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 873 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 874 | return rc; |
| 875 | } |
| 876 | } else { |
| 877 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 878 | to cause the blocking lock to return. */ |
| 879 | |
| 880 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 881 | |
| 882 | /* If we get -ENOLCK back the lock may have |
| 883 | already been removed. Don't exit in this case. */ |
| 884 | if (rc && rc != -ENOLCK) { |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 885 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 886 | return rc; |
| 887 | } |
| 888 | } |
| 889 | |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 890 | rc = wait_for_response(ses->server, midQ); |
| 891 | if (rc) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame^] | 892 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 893 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 894 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 895 | /* no longer considered to be "in-flight" */ |
| 896 | midQ->callback = DeleteMidQEntry; |
| 897 | spin_unlock(&GlobalMid_Lock); |
| 898 | return rc; |
| 899 | } |
| 900 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 901 | } |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 902 | |
| 903 | /* We got the response - restart system call. */ |
| 904 | rstart = 1; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 905 | } |
| 906 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 907 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 908 | if (rc != 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 909 | return rc; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 910 | |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 911 | /* rcvd frame is ok */ |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 912 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 913 | rc = -EIO; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 914 | cERROR(1, "Bad MID state?"); |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 915 | goto out; |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 916 | } |
| 917 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 918 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 919 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 920 | rc = cifs_check_receive(midQ, ses->server, 0); |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 921 | out: |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 922 | delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 923 | if (rstart && rc == -EACCES) |
| 924 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | return rc; |
| 926 | } |