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 | |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 38 | void |
| 39 | cifs_wake_up_task(struct mid_q_entry *mid) |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 40 | { |
| 41 | wake_up_process(mid->callback_data); |
| 42 | } |
| 43 | |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 44 | struct mid_q_entry * |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 45 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
| 47 | struct mid_q_entry *temp; |
| 48 | |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 49 | if (server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 50 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | return NULL; |
| 52 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 53 | |
Pekka Enberg | 232087c | 2008-09-15 13:22:54 +0300 | [diff] [blame] | 54 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | if (temp == NULL) |
| 56 | return temp; |
| 57 | else { |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 58 | memset(temp, 0, sizeof(struct mid_q_entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 60 | temp->pid = current->pid; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 61 | temp->command = cpu_to_le16(smb_buffer->Command); |
| 62 | cFYI(1, "For smb_command %d", smb_buffer->Command); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 63 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| 64 | /* when mid allocated can be before when sent */ |
| 65 | temp->when_alloc = jiffies; |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 66 | temp->server = server; |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 67 | |
| 68 | /* |
| 69 | * The default is for the mid to be synchronous, so the |
| 70 | * default callback just wakes up the current task. |
| 71 | */ |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 72 | temp->callback = cifs_wake_up_task; |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 73 | temp->callback_data = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | atomic_inc(&midCount); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 77 | temp->mid_state = MID_REQUEST_ALLOCATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | return temp; |
| 79 | } |
| 80 | |
Jeff Layton | 766fdbb | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 81 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 83 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 84 | #ifdef CONFIG_CIFS_STATS2 |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 85 | __le16 command = midEntry->server->vals->lock_cmd; |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 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) { |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 99 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 101 | midEntry->command, midEntry->mid); |
| 102 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 103 | now - midEntry->when_alloc, |
| 104 | now - midEntry->when_sent, |
| 105 | now - midEntry->when_received); |
| 106 | } |
| 107 | } |
| 108 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | mempool_free(midEntry, cifs_mid_poolp); |
| 110 | } |
| 111 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 112 | void |
| 113 | cifs_delete_mid(struct mid_q_entry *mid) |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 114 | { |
| 115 | spin_lock(&GlobalMid_Lock); |
| 116 | list_del(&mid->qhead); |
| 117 | spin_unlock(&GlobalMid_Lock); |
| 118 | |
| 119 | DeleteMidQEntry(mid); |
| 120 | } |
| 121 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 122 | /* |
| 123 | * smb_send_kvec - send an array of kvecs to the server |
| 124 | * @server: Server to send the data to |
| 125 | * @iov: Pointer to array of kvecs |
| 126 | * @n_vec: length of kvec array |
| 127 | * @sent: amount of data sent on socket is stored here |
| 128 | * |
| 129 | * Our basic "send data to server" function. Should be called with srv_mutex |
| 130 | * held. The caller is responsible for handling the results. |
| 131 | */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 132 | static int |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 133 | smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec, |
| 134 | size_t *sent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
| 136 | int rc = 0; |
| 137 | int i = 0; |
| 138 | struct msghdr smb_msg; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 139 | unsigned int remaining; |
| 140 | size_t first_vec = 0; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 141 | struct socket *ssocket = server->ssocket; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 142 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 143 | *sent = 0; |
| 144 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 145 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 147 | |
Pavel Shilovsky | a9f1b85 | 2010-12-13 19:08:35 +0300 | [diff] [blame] | 148 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 149 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | smb_msg.msg_control = NULL; |
| 151 | smb_msg.msg_controllen = 0; |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 152 | if (server->noblocksnd) |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 153 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 154 | else |
| 155 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 157 | remaining = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 158 | for (i = 0; i < n_vec; i++) |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 159 | remaining += iov[i].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Shirish Pargaonkar | 1768035 | 2008-07-29 21:26:13 +0000 | [diff] [blame] | 161 | i = 0; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 162 | while (remaining) { |
| 163 | /* |
| 164 | * If blocking send, we try 3 times, since each can block |
| 165 | * for 5 seconds. For nonblocking we have to try more |
| 166 | * but wait increasing amounts of time allowing time for |
| 167 | * socket to clear. The overall time we wait in either |
| 168 | * case to send on the socket is about 15 seconds. |
| 169 | * Similarly we wait for 15 seconds for a response from |
| 170 | * the server in SendReceive[2] for the server to send |
| 171 | * a response back for most types of requests (except |
| 172 | * SMB Write past end of file which can be slow, and |
| 173 | * blocking lock operations). NFS waits slightly longer |
| 174 | * than CIFS, but this can make it take longer for |
| 175 | * nonresponsive servers to be detected and 15 seconds |
| 176 | * is more than enough time for modern networks to |
| 177 | * send a packet. In most cases if we fail to send |
| 178 | * after the retries we will kill the socket and |
| 179 | * reconnect which may clear the network problem. |
| 180 | */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 181 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 182 | n_vec - first_vec, remaining); |
| 183 | if (rc == -ENOSPC || rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | i++; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 185 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
| 186 | cERROR(1, "sends on sock %p stuck for 15 " |
| 187 | "seconds", ssocket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | rc = -EAGAIN; |
| 189 | break; |
| 190 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 191 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | continue; |
| 193 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 194 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 195 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 197 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 198 | /* send was at least partially successful */ |
| 199 | *sent += rc; |
| 200 | |
| 201 | if (rc == remaining) { |
| 202 | remaining = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 203 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 204 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 205 | |
| 206 | if (rc > remaining) { |
| 207 | cERROR(1, "sent %d requested %d", rc, remaining); |
| 208 | break; |
| 209 | } |
| 210 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 211 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 212 | /* should never happen, letting socket clear before |
| 213 | retrying is our only obvious option here */ |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 214 | cERROR(1, "tcp sent no data"); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 215 | msleep(500); |
| 216 | continue; |
| 217 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 218 | |
| 219 | remaining -= rc; |
| 220 | |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 221 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 222 | for (i = first_vec; i < n_vec; i++) { |
| 223 | if (iov[i].iov_len) { |
| 224 | if (rc > iov[i].iov_len) { |
| 225 | rc -= iov[i].iov_len; |
| 226 | iov[i].iov_len = 0; |
| 227 | } else { |
| 228 | iov[i].iov_base += rc; |
| 229 | iov[i].iov_len -= rc; |
| 230 | first_vec = i; |
| 231 | break; |
| 232 | } |
| 233 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 234 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 235 | |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 236 | i = 0; /* in case we get ENOSPC on the next send */ |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 237 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 239 | return rc; |
| 240 | } |
| 241 | |
| 242 | static int |
| 243 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
| 244 | { |
| 245 | int rc; |
| 246 | struct kvec *iov = rqst->rq_iov; |
| 247 | int n_vec = rqst->rq_nvec; |
| 248 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
| 249 | size_t total_len; |
| 250 | |
| 251 | cFYI(1, "Sending smb: smb_len=%u", smb_buf_length); |
| 252 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
| 253 | |
| 254 | rc = smb_send_kvec(server, iov, n_vec, &total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 256 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 257 | cFYI(1, "partial send (wanted=%u sent=%zu): terminating " |
| 258 | "session", smb_buf_length + 4, total_len); |
| 259 | /* |
| 260 | * If we have only sent part of an SMB then the next SMB could |
| 261 | * be taken as the remainder of this one. We need to kill the |
| 262 | * socket so the server throws away the partial SMB |
| 263 | */ |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 264 | server->tcpStatus = CifsNeedReconnect; |
| 265 | } |
| 266 | |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 267 | if (rc < 0 && rc != -EINTR) |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 268 | cERROR(1, "Error %d sending data on socket to server", rc); |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 269 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | return rc; |
| 273 | } |
| 274 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame^] | 275 | static int |
| 276 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
| 277 | { |
| 278 | struct smb_rqst rqst = { .rq_iov = iov, |
| 279 | .rq_nvec = n_vec }; |
| 280 | |
| 281 | return smb_send_rqst(server, &rqst); |
| 282 | } |
| 283 | |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 284 | int |
| 285 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, |
| 286 | unsigned int smb_buf_length) |
| 287 | { |
| 288 | struct kvec iov; |
| 289 | |
| 290 | iov.iov_base = smb_buffer; |
| 291 | iov.iov_len = smb_buf_length + 4; |
| 292 | |
| 293 | return smb_sendv(server, &iov, 1); |
| 294 | } |
| 295 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 296 | static int |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 297 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 298 | int *credits) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 299 | { |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 300 | int rc; |
| 301 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 302 | spin_lock(&server->req_lock); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 303 | if (timeout == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 304 | /* oplock breaks must not be held up */ |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 305 | server->in_flight++; |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 306 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 307 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 308 | return 0; |
| 309 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 310 | |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 311 | while (1) { |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 312 | if (*credits <= 0) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 313 | spin_unlock(&server->req_lock); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 314 | cifs_num_waiters_inc(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 315 | rc = wait_event_killable(server->request_q, |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 316 | has_credits(server, credits)); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 317 | cifs_num_waiters_dec(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 318 | if (rc) |
| 319 | return rc; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 320 | spin_lock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 321 | } else { |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 322 | if (server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 323 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 324 | return -ENOENT; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 325 | } |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 326 | |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 327 | /* |
| 328 | * Can not count locking commands against total |
| 329 | * as they are allowed to block on server. |
| 330 | */ |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 331 | |
| 332 | /* update # of requests on the wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 333 | if (timeout != CIFS_BLOCKING_OP) { |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 334 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 335 | server->in_flight++; |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 336 | } |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 337 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 338 | break; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 339 | } |
| 340 | } |
| 341 | return 0; |
| 342 | } |
| 343 | |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 344 | static int |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 345 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
| 346 | const int optype) |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 347 | { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 348 | return wait_for_free_credits(server, timeout, |
| 349 | server->ops->get_credits_field(server, optype)); |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 350 | } |
| 351 | |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 352 | 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] | 353 | struct mid_q_entry **ppmidQ) |
| 354 | { |
| 355 | if (ses->server->tcpStatus == CifsExiting) { |
| 356 | return -ENOENT; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | if (ses->server->tcpStatus == CifsNeedReconnect) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 360 | cFYI(1, "tcp session dead - return to caller to retry"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 361 | return -EAGAIN; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | if (ses->status != CifsGood) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 365 | /* check if SMB session is bad because we are setting it up */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 366 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 367 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 368 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 369 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 370 | } |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 371 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 372 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 373 | return -ENOMEM; |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 374 | spin_lock(&GlobalMid_Lock); |
| 375 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); |
| 376 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 377 | return 0; |
| 378 | } |
| 379 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 380 | static int |
| 381 | 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] | 382 | { |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 383 | int error; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 384 | |
Jeff Layton | f06ac72 | 2011-10-19 15:30:40 -0400 | [diff] [blame] | 385 | error = wait_event_freezekillable(server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 386 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 387 | if (error < 0) |
| 388 | return -ERESTARTSYS; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 389 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 390 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 391 | } |
| 392 | |
Pavel Shilovsky | 4574084 | 2012-06-01 14:26:18 +0400 | [diff] [blame] | 393 | int |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 394 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, |
| 395 | unsigned int nvec, struct mid_q_entry **ret_mid) |
| 396 | { |
| 397 | int rc; |
| 398 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
| 399 | struct mid_q_entry *mid; |
| 400 | |
| 401 | /* enable signing if server requires it */ |
| 402 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 403 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| 404 | |
| 405 | mid = AllocMidQEntry(hdr, server); |
| 406 | if (mid == NULL) |
| 407 | return -ENOMEM; |
| 408 | |
Jeff Layton | 762a420 | 2012-07-23 13:28:38 -0400 | [diff] [blame] | 409 | rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number); |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 410 | if (rc) { |
| 411 | DeleteMidQEntry(mid); |
| 412 | return rc; |
| 413 | } |
| 414 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 415 | *ret_mid = mid; |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 416 | return 0; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 417 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 418 | |
| 419 | /* |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 420 | * Send a SMB request and set the callback function in the mid to handle |
| 421 | * the result. Caller is responsible for dealing with timeouts. |
| 422 | */ |
| 423 | int |
Jeff Layton | fcc31cb | 2011-05-19 16:22:53 -0400 | [diff] [blame] | 424 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
Jeff Layton | 44d22d8 | 2011-10-19 15:29:49 -0400 | [diff] [blame] | 425 | unsigned int nvec, mid_receive_t *receive, |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 426 | mid_callback_t *callback, void *cbdata, const int flags) |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 427 | { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 428 | int rc, timeout, optype; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 429 | struct mid_q_entry *mid; |
| 430 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 431 | timeout = flags & CIFS_TIMEOUT_MASK; |
| 432 | optype = flags & CIFS_OP_MASK; |
| 433 | |
| 434 | rc = wait_for_free_request(server, timeout, optype); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 435 | if (rc) |
| 436 | return rc; |
| 437 | |
| 438 | mutex_lock(&server->srv_mutex); |
Pavel Shilovsky | 4574084 | 2012-06-01 14:26:18 +0400 | [diff] [blame] | 439 | rc = server->ops->setup_async_request(server, iov, nvec, &mid); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 440 | if (rc) { |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 441 | mutex_unlock(&server->srv_mutex); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 442 | add_credits(server, 1, optype); |
Pavel Shilovsky | 0193e07 | 2011-08-03 23:12:18 +0400 | [diff] [blame] | 443 | wake_up(&server->request_q); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 444 | return rc; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 445 | } |
| 446 | |
Jeff Layton | 44d22d8 | 2011-10-19 15:29:49 -0400 | [diff] [blame] | 447 | mid->receive = receive; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 448 | mid->callback = callback; |
| 449 | mid->callback_data = cbdata; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 450 | mid->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 451 | |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 452 | /* put it on the pending_mid_q */ |
| 453 | spin_lock(&GlobalMid_Lock); |
| 454 | list_add_tail(&mid->qhead, &server->pending_mid_q); |
| 455 | spin_unlock(&GlobalMid_Lock); |
| 456 | |
| 457 | |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 458 | cifs_in_send_inc(server); |
Jeff Layton | fcc31cb | 2011-05-19 16:22:53 -0400 | [diff] [blame] | 459 | rc = smb_sendv(server, iov, nvec); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 460 | cifs_in_send_dec(server); |
| 461 | cifs_save_when_sent(mid); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 462 | mutex_unlock(&server->srv_mutex); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 463 | |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 464 | if (rc == 0) |
| 465 | return 0; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 466 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 467 | cifs_delete_mid(mid); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 468 | add_credits(server, 1, optype); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 469 | wake_up(&server->request_q); |
| 470 | return rc; |
| 471 | } |
| 472 | |
| 473 | /* |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 474 | * |
| 475 | * Send an SMB Request. No response info (other than return code) |
| 476 | * needs to be parsed. |
| 477 | * |
| 478 | * flags indicate the type of request buffer and how long to wait |
| 479 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 480 | * |
| 481 | */ |
| 482 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 483 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 484 | char *in_buf, int flags) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 485 | { |
| 486 | int rc; |
| 487 | struct kvec iov[1]; |
| 488 | int resp_buf_type; |
| 489 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 490 | iov[0].iov_base = in_buf; |
| 491 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 492 | flags |= CIFS_NO_RESP; |
| 493 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 494 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 495 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 496 | return rc; |
| 497 | } |
| 498 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 499 | static int |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 500 | 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] | 501 | { |
| 502 | int rc = 0; |
| 503 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 504 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
| 505 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 506 | |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 507 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 508 | switch (mid->mid_state) { |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 509 | case MID_RESPONSE_RECEIVED: |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 510 | spin_unlock(&GlobalMid_Lock); |
| 511 | return rc; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 512 | case MID_RETRY_NEEDED: |
| 513 | rc = -EAGAIN; |
| 514 | break; |
Jeff Layton | 71823ba | 2011-02-10 08:03:50 -0500 | [diff] [blame] | 515 | case MID_RESPONSE_MALFORMED: |
| 516 | rc = -EIO; |
| 517 | break; |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 518 | case MID_SHUTDOWN: |
| 519 | rc = -EHOSTDOWN; |
| 520 | break; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 521 | default: |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 522 | list_del_init(&mid->qhead); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 523 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
| 524 | mid->mid, mid->mid_state); |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 525 | rc = -EIO; |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 526 | } |
| 527 | spin_unlock(&GlobalMid_Lock); |
| 528 | |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 529 | DeleteMidQEntry(mid); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 530 | return rc; |
| 531 | } |
| 532 | |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 533 | static inline int |
| 534 | 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] | 535 | { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 536 | return server->ops->send_cancel ? |
| 537 | server->ops->send_cancel(server, buf, mid) : 0; |
Jeff Layton | 76dcc26 | 2011-01-11 07:24:24 -0500 | [diff] [blame] | 538 | } |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | int |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 541 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| 542 | bool log_error) |
| 543 | { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 544 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 545 | |
| 546 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 547 | |
| 548 | /* convert the length into a more usable form */ |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 549 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 550 | struct kvec iov; |
Steve French | 985e4ff0 | 2012-08-03 09:42:45 -0500 | [diff] [blame] | 551 | int rc = 0; |
Jeff Layton | bf5ea0e | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 552 | struct smb_rqst rqst = { .rq_iov = &iov, |
| 553 | .rq_nvec = 1 }; |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 554 | |
| 555 | iov.iov_base = mid->resp_buf; |
| 556 | iov.iov_len = len; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 557 | /* FIXME: add code to kill session */ |
Jeff Layton | bf5ea0e | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 558 | rc = cifs_verify_signature(&rqst, server, |
Steve French | 985e4ff0 | 2012-08-03 09:42:45 -0500 | [diff] [blame] | 559 | mid->sequence_number + 1); |
| 560 | if (rc) |
| 561 | cERROR(1, "SMB signature verification returned error = " |
| 562 | "%d", rc); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | /* BB special case reconnect tid and uid here? */ |
| 566 | return map_smb_to_linux_error(mid->resp_buf, log_error); |
| 567 | } |
| 568 | |
Pavel Shilovsky | 082d064 | 2012-05-17 12:18:21 +0400 | [diff] [blame] | 569 | int |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 570 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
| 571 | unsigned int nvec, struct mid_q_entry **ret_mid) |
| 572 | { |
| 573 | int rc; |
| 574 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; |
| 575 | struct mid_q_entry *mid; |
| 576 | |
| 577 | rc = allocate_mid(ses, hdr, &mid); |
| 578 | if (rc) |
| 579 | return rc; |
Jeff Layton | 762a420 | 2012-07-23 13:28:38 -0400 | [diff] [blame] | 580 | rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 581 | if (rc) |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 582 | cifs_delete_mid(mid); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 583 | *ret_mid = mid; |
| 584 | return rc; |
| 585 | } |
| 586 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 587 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 588 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 589 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 590 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | int rc = 0; |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 593 | int timeout, optype; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 594 | struct mid_q_entry *midQ; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 595 | char *buf = iov[0].iov_base; |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 596 | unsigned int credits = 1; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 597 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 598 | timeout = flags & CIFS_TIMEOUT_MASK; |
| 599 | optype = flags & CIFS_OP_MASK; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 600 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 601 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 603 | if ((ses == NULL) || (ses->server == NULL)) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 604 | cifs_small_buf_release(buf); |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 605 | cERROR(1, "Null session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return -EIO; |
| 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 609 | if (ses->server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 610 | cifs_small_buf_release(buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 611 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 612 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 613 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 614 | /* |
| 615 | * Ensure that we do not send more than 50 overlapping requests |
| 616 | * to the same server. We may make this configurable later or |
| 617 | * use ses->maxReq. |
| 618 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 620 | rc = wait_for_free_request(ses->server, timeout, optype); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 621 | if (rc) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 622 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 623 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 625 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 626 | /* |
| 627 | * Make sure that we sign in the same order that we send on this socket |
| 628 | * and avoid races inside tcp sendmsg code that could cause corruption |
| 629 | * of smb data. |
| 630 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 632 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Pavel Shilovsky | 082d064 | 2012-05-17 12:18:21 +0400 | [diff] [blame] | 634 | rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 635 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 636 | mutex_unlock(&ses->server->srv_mutex); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 637 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 638 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 639 | add_credits(ses->server, 1, optype); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 640 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 643 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 644 | cifs_in_send_inc(ses->server); |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 645 | rc = smb_sendv(ses->server, iov, n_vec); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 646 | cifs_in_send_dec(ses->server); |
| 647 | cifs_save_when_sent(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 648 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 649 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 650 | |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 651 | if (rc < 0) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 652 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 653 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 654 | } |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 655 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 656 | if (timeout == CIFS_ASYNC_OP) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 657 | cifs_small_buf_release(buf); |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 658 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 659 | } |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 660 | |
| 661 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 662 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 663 | send_cancel(ses->server, buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 664 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 665 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 666 | midQ->callback = DeleteMidQEntry; |
| 667 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 668 | cifs_small_buf_release(buf); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 669 | add_credits(ses->server, 1, optype); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 670 | return rc; |
| 671 | } |
| 672 | spin_unlock(&GlobalMid_Lock); |
| 673 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 674 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 675 | cifs_small_buf_release(buf); |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 676 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 677 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 678 | if (rc != 0) { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 679 | add_credits(ses->server, 1, optype); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 680 | return rc; |
| 681 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 682 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 683 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 684 | rc = -EIO; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 685 | cFYI(1, "Bad MID state?"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 686 | goto out; |
| 687 | } |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 688 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 689 | buf = (char *)midQ->resp_buf; |
| 690 | iov[0].iov_base = buf; |
| 691 | iov[0].iov_len = get_rfc1002_length(buf) + 4; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 692 | if (midQ->large_buf) |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 693 | *resp_buf_type = CIFS_LARGE_BUFFER; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 694 | else |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 695 | *resp_buf_type = CIFS_SMALL_BUFFER; |
| 696 | |
| 697 | credits = ses->server->ops->get_credits(midQ); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 698 | |
Pavel Shilovsky | 082d064 | 2012-05-17 12:18:21 +0400 | [diff] [blame] | 699 | rc = ses->server->ops->check_receive(midQ, ses->server, |
| 700 | flags & CIFS_LOG_ERROR); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 701 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 702 | /* mark it so buf will not be freed by cifs_delete_mid */ |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 703 | if ((flags & CIFS_NO_RESP) == 0) |
| 704 | midQ->resp_buf = NULL; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 705 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 706 | cifs_delete_mid(midQ); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 707 | add_credits(ses->server, credits, optype); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | return rc; |
| 710 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 713 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 715 | int *pbytes_returned, const int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | { |
| 717 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | struct mid_q_entry *midQ; |
| 719 | |
| 720 | if (ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 721 | cERROR(1, "Null smb session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | return -EIO; |
| 723 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 724 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 725 | cERROR(1, "Null tcp session"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | return -EIO; |
| 727 | } |
| 728 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 729 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 730 | return -ENOENT; |
| 731 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 732 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | to the same server. We may make this configurable later or |
| 734 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 736 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 737 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 738 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 739 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 740 | return -EIO; |
| 741 | } |
| 742 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 743 | rc = wait_for_free_request(ses->server, timeout, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 744 | if (rc) |
| 745 | return rc; |
| 746 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 747 | /* 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] | 748 | and avoid races inside tcp sendmsg code that could cause corruption |
| 749 | of smb data */ |
| 750 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 751 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 753 | rc = allocate_mid(ses, in_buf, &midQ); |
| 754 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 755 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 756 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 757 | add_credits(ses->server, 1, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 758 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | } |
| 760 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 761 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 762 | if (rc) { |
| 763 | mutex_unlock(&ses->server->srv_mutex); |
| 764 | goto out; |
| 765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 767 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 768 | |
| 769 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 770 | 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] | 771 | cifs_in_send_dec(ses->server); |
| 772 | cifs_save_when_sent(midQ); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 773 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 774 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 775 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 776 | goto out; |
| 777 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 778 | if (timeout == CIFS_ASYNC_OP) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 779 | goto out; |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 780 | |
| 781 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 782 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 783 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 784 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 785 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 786 | /* no longer considered to be "in-flight" */ |
| 787 | midQ->callback = DeleteMidQEntry; |
| 788 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 789 | add_credits(ses->server, 1, 0); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 790 | return rc; |
| 791 | } |
| 792 | spin_unlock(&GlobalMid_Lock); |
| 793 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 795 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 796 | if (rc != 0) { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 797 | add_credits(ses->server, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return rc; |
| 799 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 800 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 801 | if (!midQ->resp_buf || !out_buf || |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 802 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | rc = -EIO; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 804 | cERROR(1, "Bad MID state?"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 805 | goto out; |
| 806 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 808 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 809 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 810 | rc = cifs_check_receive(midQ, ses->server, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 811 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 812 | cifs_delete_mid(midQ); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 813 | add_credits(ses->server, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 816 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 818 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 819 | blocking lock to return. */ |
| 820 | |
| 821 | static int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 822 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 823 | struct smb_hdr *in_buf, |
| 824 | struct smb_hdr *out_buf) |
| 825 | { |
| 826 | int bytes_returned; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 827 | struct cifs_ses *ses = tcon->ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 828 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 829 | |
| 830 | /* We just modify the current in_buf to change |
| 831 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 832 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 833 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 834 | |
| 835 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 836 | pSMB->Timeout = 0; |
Pavel Shilovsky | 8825736 | 2012-05-23 14:01:59 +0400 | [diff] [blame] | 837 | pSMB->hdr.Mid = get_next_mid(ses->server); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 838 | |
| 839 | return SendReceive(xid, ses, in_buf, out_buf, |
Jeff Layton | 7749981 | 2011-01-11 07:24:23 -0500 | [diff] [blame] | 840 | &bytes_returned, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 844 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 845 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 846 | int *pbytes_returned) |
| 847 | { |
| 848 | int rc = 0; |
| 849 | int rstart = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 850 | struct mid_q_entry *midQ; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 851 | struct cifs_ses *ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 852 | |
| 853 | if (tcon == NULL || tcon->ses == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 854 | cERROR(1, "Null smb session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 855 | return -EIO; |
| 856 | } |
| 857 | ses = tcon->ses; |
| 858 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 859 | if (ses->server == NULL) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 860 | cERROR(1, "Null tcp session"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 861 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
| 863 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 864 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 865 | return -ENOENT; |
| 866 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 867 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 868 | to the same server. We may make this configurable later or |
| 869 | use ses->maxReq */ |
| 870 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 871 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 872 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 873 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 874 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 875 | return -EIO; |
| 876 | } |
| 877 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 878 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 879 | if (rc) |
| 880 | return rc; |
| 881 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 882 | /* 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] | 883 | and avoid races inside tcp sendmsg code that could cause corruption |
| 884 | of smb data */ |
| 885 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 886 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 887 | |
| 888 | rc = allocate_mid(ses, in_buf, &midQ); |
| 889 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 890 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 891 | return rc; |
| 892 | } |
| 893 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 894 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 895 | if (rc) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 896 | cifs_delete_mid(midQ); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 897 | mutex_unlock(&ses->server->srv_mutex); |
| 898 | return rc; |
| 899 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 900 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 901 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 902 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 903 | 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] | 904 | cifs_in_send_dec(ses->server); |
| 905 | cifs_save_when_sent(midQ); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 906 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 907 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 908 | if (rc < 0) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 909 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 910 | return rc; |
| 911 | } |
| 912 | |
| 913 | /* Wait for a reply - allow signals to interrupt. */ |
| 914 | rc = wait_event_interruptible(ses->server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 915 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 916 | ((ses->server->tcpStatus != CifsGood) && |
| 917 | (ses->server->tcpStatus != CifsNew))); |
| 918 | |
| 919 | /* Were we interrupted by a signal ? */ |
| 920 | if ((rc == -ERESTARTSYS) && |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 921 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 922 | ((ses->server->tcpStatus == CifsGood) || |
| 923 | (ses->server->tcpStatus == CifsNew))) { |
| 924 | |
| 925 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 926 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 927 | blocking lock to return. */ |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 928 | rc = send_cancel(ses->server, in_buf, midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 929 | if (rc) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 930 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 931 | return rc; |
| 932 | } |
| 933 | } else { |
| 934 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 935 | to cause the blocking lock to return. */ |
| 936 | |
| 937 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 938 | |
| 939 | /* If we get -ENOLCK back the lock may have |
| 940 | already been removed. Don't exit in this case. */ |
| 941 | if (rc && rc != -ENOLCK) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 942 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 943 | return rc; |
| 944 | } |
| 945 | } |
| 946 | |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 947 | rc = wait_for_response(ses->server, midQ); |
| 948 | if (rc) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 949 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 950 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 951 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 952 | /* no longer considered to be "in-flight" */ |
| 953 | midQ->callback = DeleteMidQEntry; |
| 954 | spin_unlock(&GlobalMid_Lock); |
| 955 | return rc; |
| 956 | } |
| 957 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 958 | } |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 959 | |
| 960 | /* We got the response - restart system call. */ |
| 961 | rstart = 1; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 962 | } |
| 963 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 964 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 965 | if (rc != 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 966 | return rc; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 967 | |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 968 | /* rcvd frame is ok */ |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 969 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 970 | rc = -EIO; |
Joe Perches | b6b38f7 | 2010-04-21 03:50:45 +0000 | [diff] [blame] | 971 | cERROR(1, "Bad MID state?"); |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 972 | goto out; |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 973 | } |
| 974 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 975 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 976 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 977 | rc = cifs_check_receive(midQ, ses->server, 0); |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 978 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 979 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 980 | if (rstart && rc == -EACCES) |
| 981 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | return rc; |
| 983 | } |