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> |
Jeff Layton | b8eed28 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 30 | #include <linux/tcp.h> |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 31 | #include <linux/highmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/uaccess.h> |
| 33 | #include <asm/processor.h> |
| 34 | #include <linux/mempool.h> |
| 35 | #include "cifspdu.h" |
| 36 | #include "cifsglob.h" |
| 37 | #include "cifsproto.h" |
| 38 | #include "cifs_debug.h" |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 39 | |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 40 | void |
| 41 | cifs_wake_up_task(struct mid_q_entry *mid) |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 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 | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 52 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
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)); |
Tim Gardner | 3d378d3 | 2013-11-02 12:50:34 -0500 | [diff] [blame] | 61 | temp->mid = get_mid(smb_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 64 | cifs_dbg(FYI, "For smb_command %d\n", 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; |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 68 | temp->server = server; |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 69 | |
| 70 | /* |
| 71 | * The default is for the mid to be synchronous, so the |
| 72 | * default callback just wakes up the current task. |
| 73 | */ |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 74 | temp->callback = cifs_wake_up_task; |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 75 | temp->callback_data = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | atomic_inc(&midCount); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 79 | temp->mid_state = MID_REQUEST_ALLOCATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return temp; |
| 81 | } |
| 82 | |
Jeff Layton | 766fdbb | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 83 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 85 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 86 | #ifdef CONFIG_CIFS_STATS2 |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 87 | __le16 command = midEntry->server->vals->lock_cmd; |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 88 | unsigned long now; |
| 89 | #endif |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 90 | midEntry->mid_state = MID_FREE; |
Jeff Layton | 8097531 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 91 | atomic_dec(&midCount); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 92 | if (midEntry->large_buf) |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 93 | cifs_buf_release(midEntry->resp_buf); |
| 94 | else |
| 95 | cifs_small_buf_release(midEntry->resp_buf); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 96 | #ifdef CONFIG_CIFS_STATS2 |
| 97 | now = jiffies; |
| 98 | /* commands taking longer than one second are indications that |
| 99 | something is wrong, unless it is quite a slow link or server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 100 | if ((now - midEntry->when_alloc) > HZ) { |
Pavel Shilovsky | 2dc7e1c | 2011-12-26 22:53:34 +0400 | [diff] [blame] | 101 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 102 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 103 | midEntry->command, midEntry->mid); |
| 104 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 105 | now - midEntry->when_alloc, |
| 106 | now - midEntry->when_sent, |
| 107 | now - midEntry->when_received); |
| 108 | } |
| 109 | } |
| 110 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | mempool_free(midEntry, cifs_mid_poolp); |
| 112 | } |
| 113 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 114 | void |
| 115 | cifs_delete_mid(struct mid_q_entry *mid) |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 116 | { |
| 117 | spin_lock(&GlobalMid_Lock); |
| 118 | list_del(&mid->qhead); |
| 119 | spin_unlock(&GlobalMid_Lock); |
| 120 | |
| 121 | DeleteMidQEntry(mid); |
| 122 | } |
| 123 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 124 | /* |
| 125 | * smb_send_kvec - send an array of kvecs to the server |
| 126 | * @server: Server to send the data to |
| 127 | * @iov: Pointer to array of kvecs |
| 128 | * @n_vec: length of kvec array |
| 129 | * @sent: amount of data sent on socket is stored here |
| 130 | * |
| 131 | * Our basic "send data to server" function. Should be called with srv_mutex |
| 132 | * held. The caller is responsible for handling the results. |
| 133 | */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 134 | static int |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 135 | smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec, |
| 136 | size_t *sent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
| 138 | int rc = 0; |
| 139 | int i = 0; |
| 140 | struct msghdr smb_msg; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 141 | unsigned int remaining; |
| 142 | size_t first_vec = 0; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 143 | struct socket *ssocket = server->ssocket; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 144 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 145 | *sent = 0; |
| 146 | |
Pavel Shilovsky | a9f1b85 | 2010-12-13 19:08:35 +0300 | [diff] [blame] | 147 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 148 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | smb_msg.msg_control = NULL; |
| 150 | smb_msg.msg_controllen = 0; |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 151 | if (server->noblocksnd) |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 152 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 153 | else |
| 154 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 156 | remaining = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 157 | for (i = 0; i < n_vec; i++) |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 158 | remaining += iov[i].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Shirish Pargaonkar | 1768035 | 2008-07-29 21:26:13 +0000 | [diff] [blame] | 160 | i = 0; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 161 | while (remaining) { |
| 162 | /* |
| 163 | * If blocking send, we try 3 times, since each can block |
| 164 | * for 5 seconds. For nonblocking we have to try more |
| 165 | * but wait increasing amounts of time allowing time for |
| 166 | * socket to clear. The overall time we wait in either |
| 167 | * case to send on the socket is about 15 seconds. |
| 168 | * Similarly we wait for 15 seconds for a response from |
| 169 | * the server in SendReceive[2] for the server to send |
| 170 | * a response back for most types of requests (except |
| 171 | * SMB Write past end of file which can be slow, and |
| 172 | * blocking lock operations). NFS waits slightly longer |
| 173 | * than CIFS, but this can make it take longer for |
| 174 | * nonresponsive servers to be detected and 15 seconds |
| 175 | * is more than enough time for modern networks to |
| 176 | * send a packet. In most cases if we fail to send |
| 177 | * after the retries we will kill the socket and |
| 178 | * reconnect which may clear the network problem. |
| 179 | */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 180 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 181 | n_vec - first_vec, remaining); |
Jeff Layton | ce6c44e | 2013-03-22 08:36:45 -0400 | [diff] [blame] | 182 | if (rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | i++; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 184 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 185 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
| 186 | ssocket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | rc = -EAGAIN; |
| 188 | break; |
| 189 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 190 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | continue; |
| 192 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 193 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 194 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 196 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 197 | /* send was at least partially successful */ |
| 198 | *sent += rc; |
| 199 | |
| 200 | if (rc == remaining) { |
| 201 | remaining = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 202 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 203 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 204 | |
| 205 | if (rc > remaining) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 206 | cifs_dbg(VFS, "sent %d requested %d\n", rc, remaining); |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 207 | break; |
| 208 | } |
| 209 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 210 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 211 | /* should never happen, letting socket clear before |
| 212 | retrying is our only obvious option here */ |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 213 | cifs_dbg(VFS, "tcp sent no data\n"); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 214 | msleep(500); |
| 215 | continue; |
| 216 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 217 | |
| 218 | remaining -= rc; |
| 219 | |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 220 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 221 | for (i = first_vec; i < n_vec; i++) { |
| 222 | if (iov[i].iov_len) { |
| 223 | if (rc > iov[i].iov_len) { |
| 224 | rc -= iov[i].iov_len; |
| 225 | iov[i].iov_len = 0; |
| 226 | } else { |
| 227 | iov[i].iov_base += rc; |
| 228 | iov[i].iov_len -= rc; |
| 229 | first_vec = i; |
| 230 | break; |
| 231 | } |
| 232 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 233 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 234 | |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 235 | i = 0; /* in case we get ENOSPC on the next send */ |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 236 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 238 | return rc; |
| 239 | } |
| 240 | |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 241 | /** |
| 242 | * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec |
| 243 | * @rqst: pointer to smb_rqst |
| 244 | * @idx: index into the array of the page |
| 245 | * @iov: pointer to struct kvec that will hold the result |
| 246 | * |
| 247 | * Helper function to convert a slot in the rqst->rq_pages array into a kvec. |
| 248 | * The page will be kmapped and the address placed into iov_base. The length |
| 249 | * will then be adjusted according to the ptailoff. |
| 250 | */ |
Jeff Layton | fb308a6 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 251 | void |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 252 | cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx, |
| 253 | struct kvec *iov) |
| 254 | { |
| 255 | /* |
| 256 | * FIXME: We could avoid this kmap altogether if we used |
| 257 | * kernel_sendpage instead of kernel_sendmsg. That will only |
| 258 | * work if signing is disabled though as sendpage inlines the |
| 259 | * page directly into the fraglist. If userspace modifies the |
| 260 | * page after we calculate the signature, then the server will |
| 261 | * reject it and may break the connection. kernel_sendmsg does |
| 262 | * an extra copy of the data and avoids that issue. |
| 263 | */ |
| 264 | iov->iov_base = kmap(rqst->rq_pages[idx]); |
| 265 | |
| 266 | /* if last page, don't send beyond this offset into page */ |
| 267 | if (idx == (rqst->rq_npages - 1)) |
| 268 | iov->iov_len = rqst->rq_tailsz; |
| 269 | else |
| 270 | iov->iov_len = rqst->rq_pagesz; |
| 271 | } |
| 272 | |
Jeff Layton | a26054d | 2014-02-14 07:21:00 -0500 | [diff] [blame^] | 273 | static unsigned long |
| 274 | rqst_len(struct smb_rqst *rqst) |
| 275 | { |
| 276 | unsigned int i; |
| 277 | struct kvec *iov = rqst->rq_iov; |
| 278 | unsigned long buflen = 0; |
| 279 | |
| 280 | /* total up iov array first */ |
| 281 | for (i = 0; i < rqst->rq_nvec; i++) |
| 282 | buflen += iov[i].iov_len; |
| 283 | |
| 284 | /* add in the page array if there is one */ |
| 285 | if (rqst->rq_npages) { |
| 286 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1); |
| 287 | buflen += rqst->rq_tailsz; |
| 288 | } |
| 289 | |
| 290 | return buflen; |
| 291 | } |
| 292 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 293 | static int |
| 294 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
| 295 | { |
| 296 | int rc; |
| 297 | struct kvec *iov = rqst->rq_iov; |
| 298 | int n_vec = rqst->rq_nvec; |
| 299 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
Jeff Layton | a26054d | 2014-02-14 07:21:00 -0500 | [diff] [blame^] | 300 | unsigned long send_length; |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 301 | unsigned int i; |
| 302 | size_t total_len = 0, sent; |
Jeff Layton | b8eed28 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 303 | struct socket *ssocket = server->ssocket; |
| 304 | int val = 1; |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 305 | |
Jeff Layton | ea702b8 | 2012-12-27 07:28:55 -0500 | [diff] [blame] | 306 | if (ssocket == NULL) |
| 307 | return -ENOTSOCK; |
| 308 | |
Jeff Layton | a26054d | 2014-02-14 07:21:00 -0500 | [diff] [blame^] | 309 | /* sanity check send length */ |
| 310 | send_length = rqst_len(rqst); |
| 311 | if (send_length != smb_buf_length + 4) { |
| 312 | WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", |
| 313 | send_length, smb_buf_length); |
| 314 | return -EIO; |
| 315 | } |
| 316 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 317 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 318 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
| 319 | |
Jeff Layton | b8eed28 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 320 | /* cork the socket */ |
| 321 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, |
| 322 | (char *)&val, sizeof(val)); |
| 323 | |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 324 | rc = smb_send_kvec(server, iov, n_vec, &sent); |
| 325 | if (rc < 0) |
| 326 | goto uncork; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
Jeff Layton | 97bc00b | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 328 | total_len += sent; |
| 329 | |
| 330 | /* now walk the page array and send each page in it */ |
| 331 | for (i = 0; i < rqst->rq_npages; i++) { |
| 332 | struct kvec p_iov; |
| 333 | |
| 334 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); |
| 335 | rc = smb_send_kvec(server, &p_iov, 1, &sent); |
| 336 | kunmap(rqst->rq_pages[i]); |
| 337 | if (rc < 0) |
| 338 | break; |
| 339 | |
| 340 | total_len += sent; |
| 341 | } |
| 342 | |
| 343 | uncork: |
Jeff Layton | b8eed28 | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 344 | /* uncork it */ |
| 345 | val = 0; |
| 346 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, |
| 347 | (char *)&val, sizeof(val)); |
| 348 | |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 349 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 350 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
| 351 | smb_buf_length + 4, total_len); |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 352 | /* |
| 353 | * If we have only sent part of an SMB then the next SMB could |
| 354 | * be taken as the remainder of this one. We need to kill the |
| 355 | * socket so the server throws away the partial SMB |
| 356 | */ |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 357 | server->tcpStatus = CifsNeedReconnect; |
| 358 | } |
| 359 | |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 360 | if (rc < 0 && rc != -EINTR) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 361 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
| 362 | rc); |
Jeff Layton | d804d41 | 2011-01-28 15:05:43 -0500 | [diff] [blame] | 363 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | return rc; |
| 367 | } |
| 368 | |
Jeff Layton | 6f49f46 | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 369 | static int |
| 370 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
| 371 | { |
| 372 | struct smb_rqst rqst = { .rq_iov = iov, |
| 373 | .rq_nvec = n_vec }; |
| 374 | |
| 375 | return smb_send_rqst(server, &rqst); |
| 376 | } |
| 377 | |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 378 | int |
| 379 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, |
| 380 | unsigned int smb_buf_length) |
| 381 | { |
| 382 | struct kvec iov; |
| 383 | |
| 384 | iov.iov_base = smb_buffer; |
| 385 | iov.iov_len = smb_buf_length + 4; |
| 386 | |
| 387 | return smb_sendv(server, &iov, 1); |
| 388 | } |
| 389 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 390 | static int |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 391 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 392 | int *credits) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 393 | { |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 394 | int rc; |
| 395 | |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 396 | spin_lock(&server->req_lock); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 397 | if (timeout == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 398 | /* oplock breaks must not be held up */ |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 399 | server->in_flight++; |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 400 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 401 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 402 | return 0; |
| 403 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 404 | |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 405 | while (1) { |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 406 | if (*credits <= 0) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 407 | spin_unlock(&server->req_lock); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 408 | cifs_num_waiters_inc(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 409 | rc = wait_event_killable(server->request_q, |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 410 | has_credits(server, credits)); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 411 | cifs_num_waiters_dec(server); |
Pavel Shilovsky | 5bc5949 | 2012-02-21 19:56:08 +0300 | [diff] [blame] | 412 | if (rc) |
| 413 | return rc; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 414 | spin_lock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 415 | } else { |
Jeff Layton | c5797a9 | 2011-01-11 07:24:01 -0500 | [diff] [blame] | 416 | if (server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 417 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 418 | return -ENOENT; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 419 | } |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 420 | |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 421 | /* |
| 422 | * Can not count locking commands against total |
| 423 | * as they are allowed to block on server. |
| 424 | */ |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 425 | |
| 426 | /* update # of requests on the wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 427 | if (timeout != CIFS_BLOCKING_OP) { |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 428 | *credits -= 1; |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 429 | server->in_flight++; |
Pavel Shilovsky | 2d86dbc | 2012-02-06 15:59:18 +0400 | [diff] [blame] | 430 | } |
Pavel Shilovsky | fc40f9c | 2012-02-17 17:09:12 +0300 | [diff] [blame] | 431 | spin_unlock(&server->req_lock); |
Volker Lendecke | 27a97a6 | 2008-12-08 20:59:39 +0000 | [diff] [blame] | 432 | break; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 433 | } |
| 434 | } |
| 435 | return 0; |
| 436 | } |
| 437 | |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 438 | static int |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 439 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
| 440 | const int optype) |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 441 | { |
Shirish Pargaonkar | eb4c7df | 2013-10-03 05:44:45 -0500 | [diff] [blame] | 442 | int *val; |
| 443 | |
| 444 | val = server->ops->get_credits_field(server, optype); |
| 445 | /* Since an echo is already inflight, no need to wait to send another */ |
| 446 | if (*val <= 0 && optype == CIFS_ECHO_OP) |
| 447 | return -EAGAIN; |
| 448 | return wait_for_free_credits(server, timeout, val); |
Pavel Shilovsky | bc205ed | 2012-03-15 13:22:27 +0300 | [diff] [blame] | 449 | } |
| 450 | |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 451 | 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] | 452 | struct mid_q_entry **ppmidQ) |
| 453 | { |
| 454 | if (ses->server->tcpStatus == CifsExiting) { |
| 455 | return -ENOENT; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | if (ses->server->tcpStatus == CifsNeedReconnect) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 459 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 460 | return -EAGAIN; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame] | 461 | } |
| 462 | |
Shirish Pargaonkar | 7f48558 | 2013-10-12 10:06:03 -0500 | [diff] [blame] | 463 | if (ses->status == CifsNew) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 464 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 465 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 466 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 467 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 468 | } |
Shirish Pargaonkar | 7f48558 | 2013-10-12 10:06:03 -0500 | [diff] [blame] | 469 | |
| 470 | if (ses->status == CifsExiting) { |
| 471 | /* check if SMB session is bad because we are setting it up */ |
| 472 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) |
| 473 | return -EAGAIN; |
| 474 | /* else ok - we are shutting down session */ |
| 475 | } |
| 476 | |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 477 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 478 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 479 | return -ENOMEM; |
Jeff Layton | ddc8cf8 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 480 | spin_lock(&GlobalMid_Lock); |
| 481 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); |
| 482 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 483 | return 0; |
| 484 | } |
| 485 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 486 | static int |
| 487 | 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] | 488 | { |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 489 | int error; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 490 | |
Colin Cross | 5853cc2 | 2013-05-07 17:52:05 +0000 | [diff] [blame] | 491 | error = wait_event_freezekillable_unsafe(server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 492 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 493 | if (error < 0) |
| 494 | return -ERESTARTSYS; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 495 | |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 496 | return 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 497 | } |
| 498 | |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 499 | struct mid_q_entry * |
| 500 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 501 | { |
| 502 | int rc; |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 503 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 504 | struct mid_q_entry *mid; |
| 505 | |
| 506 | /* enable signing if server requires it */ |
Jeff Layton | 38d77c5 | 2013-05-26 07:01:00 -0400 | [diff] [blame] | 507 | if (server->sign) |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 508 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| 509 | |
| 510 | mid = AllocMidQEntry(hdr, server); |
| 511 | if (mid == NULL) |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 512 | return ERR_PTR(-ENOMEM); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 513 | |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 514 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 515 | if (rc) { |
| 516 | DeleteMidQEntry(mid); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 517 | return ERR_PTR(rc); |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 518 | } |
| 519 | |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 520 | return mid; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 521 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 522 | |
| 523 | /* |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 524 | * Send a SMB request and set the callback function in the mid to handle |
| 525 | * the result. Caller is responsible for dealing with timeouts. |
| 526 | */ |
| 527 | int |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 528 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
| 529 | mid_receive_t *receive, mid_callback_t *callback, |
| 530 | void *cbdata, const int flags) |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 531 | { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 532 | int rc, timeout, optype; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 533 | struct mid_q_entry *mid; |
| 534 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 535 | timeout = flags & CIFS_TIMEOUT_MASK; |
| 536 | optype = flags & CIFS_OP_MASK; |
| 537 | |
| 538 | rc = wait_for_free_request(server, timeout, optype); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 539 | if (rc) |
| 540 | return rc; |
| 541 | |
| 542 | mutex_lock(&server->srv_mutex); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 543 | mid = server->ops->setup_async_request(server, rqst); |
| 544 | if (IS_ERR(mid)) { |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 545 | mutex_unlock(&server->srv_mutex); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 546 | add_credits(server, 1, optype); |
Pavel Shilovsky | 0193e07 | 2011-08-03 23:12:18 +0400 | [diff] [blame] | 547 | wake_up(&server->request_q); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 548 | return PTR_ERR(mid); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 549 | } |
| 550 | |
Jeff Layton | 44d22d8 | 2011-10-19 15:29:49 -0400 | [diff] [blame] | 551 | mid->receive = receive; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 552 | mid->callback = callback; |
| 553 | mid->callback_data = cbdata; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 554 | mid->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 555 | |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 556 | /* put it on the pending_mid_q */ |
| 557 | spin_lock(&GlobalMid_Lock); |
| 558 | list_add_tail(&mid->qhead, &server->pending_mid_q); |
| 559 | spin_unlock(&GlobalMid_Lock); |
| 560 | |
| 561 | |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 562 | cifs_in_send_inc(server); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 563 | rc = smb_send_rqst(server, rqst); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 564 | cifs_in_send_dec(server); |
| 565 | cifs_save_when_sent(mid); |
Jeff Layton | ad313cb | 2013-04-03 10:27:36 -0400 | [diff] [blame] | 566 | |
| 567 | if (rc < 0) |
| 568 | server->sequence_number -= 2; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 569 | mutex_unlock(&server->srv_mutex); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 570 | |
Sachin Prabhu | ffc61cc | 2012-07-11 12:28:05 +0100 | [diff] [blame] | 571 | if (rc == 0) |
| 572 | return 0; |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 573 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 574 | cifs_delete_mid(mid); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 575 | add_credits(server, 1, optype); |
Jeff Layton | a6827c1 | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 576 | wake_up(&server->request_q); |
| 577 | return rc; |
| 578 | } |
| 579 | |
| 580 | /* |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 581 | * |
| 582 | * Send an SMB Request. No response info (other than return code) |
| 583 | * needs to be parsed. |
| 584 | * |
| 585 | * flags indicate the type of request buffer and how long to wait |
| 586 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 587 | * |
| 588 | */ |
| 589 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 590 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 591 | char *in_buf, int flags) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 592 | { |
| 593 | int rc; |
| 594 | struct kvec iov[1]; |
| 595 | int resp_buf_type; |
| 596 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 597 | iov[0].iov_base = in_buf; |
| 598 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 599 | flags |= CIFS_NO_RESP; |
| 600 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 601 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 602 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 603 | return rc; |
| 604 | } |
| 605 | |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 606 | static int |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 607 | 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] | 608 | { |
| 609 | int rc = 0; |
| 610 | |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 611 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
| 612 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 613 | |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 614 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 615 | switch (mid->mid_state) { |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 616 | case MID_RESPONSE_RECEIVED: |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 617 | spin_unlock(&GlobalMid_Lock); |
| 618 | return rc; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 619 | case MID_RETRY_NEEDED: |
| 620 | rc = -EAGAIN; |
| 621 | break; |
Jeff Layton | 71823ba | 2011-02-10 08:03:50 -0500 | [diff] [blame] | 622 | case MID_RESPONSE_MALFORMED: |
| 623 | rc = -EIO; |
| 624 | break; |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 625 | case MID_SHUTDOWN: |
| 626 | rc = -EHOSTDOWN; |
| 627 | break; |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 628 | default: |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 629 | list_del_init(&mid->qhead); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 630 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
| 631 | __func__, mid->mid, mid->mid_state); |
Jeff Layton | 74dd92a | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 632 | rc = -EIO; |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 633 | } |
| 634 | spin_unlock(&GlobalMid_Lock); |
| 635 | |
Jeff Layton | 2b84a36c | 2011-01-11 07:24:21 -0500 | [diff] [blame] | 636 | DeleteMidQEntry(mid); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 637 | return rc; |
| 638 | } |
| 639 | |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 640 | static inline int |
| 641 | 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] | 642 | { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 643 | return server->ops->send_cancel ? |
| 644 | server->ops->send_cancel(server, buf, mid) : 0; |
Jeff Layton | 76dcc26 | 2011-01-11 07:24:24 -0500 | [diff] [blame] | 645 | } |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | int |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 648 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| 649 | bool log_error) |
| 650 | { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 651 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 652 | |
| 653 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 654 | |
| 655 | /* convert the length into a more usable form */ |
Jeff Layton | 38d77c5 | 2013-05-26 07:01:00 -0400 | [diff] [blame] | 656 | if (server->sign) { |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 657 | struct kvec iov; |
Steve French | 985e4ff0 | 2012-08-03 09:42:45 -0500 | [diff] [blame] | 658 | int rc = 0; |
Jeff Layton | bf5ea0e | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 659 | struct smb_rqst rqst = { .rq_iov = &iov, |
| 660 | .rq_nvec = 1 }; |
Jeff Layton | 826a95e | 2011-10-11 06:41:32 -0400 | [diff] [blame] | 661 | |
| 662 | iov.iov_base = mid->resp_buf; |
| 663 | iov.iov_len = len; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 664 | /* FIXME: add code to kill session */ |
Jeff Layton | bf5ea0e | 2012-09-18 16:20:34 -0700 | [diff] [blame] | 665 | rc = cifs_verify_signature(&rqst, server, |
Jeff Layton | 0124cc4 | 2013-04-03 11:55:03 -0400 | [diff] [blame] | 666 | mid->sequence_number); |
Steve French | 985e4ff0 | 2012-08-03 09:42:45 -0500 | [diff] [blame] | 667 | if (rc) |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 668 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
| 669 | rc); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | /* BB special case reconnect tid and uid here? */ |
| 673 | return map_smb_to_linux_error(mid->resp_buf, log_error); |
| 674 | } |
| 675 | |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 676 | struct mid_q_entry * |
| 677 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 678 | { |
| 679 | int rc; |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 680 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 681 | struct mid_q_entry *mid; |
| 682 | |
| 683 | rc = allocate_mid(ses, hdr, &mid); |
| 684 | if (rc) |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 685 | return ERR_PTR(rc); |
| 686 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); |
| 687 | if (rc) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 688 | cifs_delete_mid(mid); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 689 | return ERR_PTR(rc); |
| 690 | } |
| 691 | return mid; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 692 | } |
| 693 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 694 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 695 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 696 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 697 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | { |
| 699 | int rc = 0; |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 700 | int timeout, optype; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 701 | struct mid_q_entry *midQ; |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 702 | char *buf = iov[0].iov_base; |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 703 | unsigned int credits = 1; |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 704 | struct smb_rqst rqst = { .rq_iov = iov, |
| 705 | .rq_nvec = n_vec }; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 706 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 707 | timeout = flags & CIFS_TIMEOUT_MASK; |
| 708 | optype = flags & CIFS_OP_MASK; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 709 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 710 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 712 | if ((ses == NULL) || (ses->server == NULL)) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 713 | cifs_small_buf_release(buf); |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 714 | cifs_dbg(VFS, "Null session\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | return -EIO; |
| 716 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 718 | if (ses->server->tcpStatus == CifsExiting) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 719 | cifs_small_buf_release(buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 720 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 721 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 722 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 723 | /* |
| 724 | * Ensure that we do not send more than 50 overlapping requests |
| 725 | * to the same server. We may make this configurable later or |
| 726 | * use ses->maxReq. |
| 727 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 729 | rc = wait_for_free_request(ses->server, timeout, optype); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 730 | if (rc) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 731 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 732 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 734 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 735 | /* |
| 736 | * Make sure that we sign in the same order that we send on this socket |
| 737 | * and avoid races inside tcp sendmsg code that could cause corruption |
| 738 | * of smb data. |
| 739 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 741 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 743 | midQ = ses->server->ops->setup_request(ses, &rqst); |
| 744 | if (IS_ERR(midQ)) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 745 | mutex_unlock(&ses->server->srv_mutex); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 746 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 747 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 748 | add_credits(ses->server, 1, optype); |
Jeff Layton | fec344e | 2012-09-18 16:20:35 -0700 | [diff] [blame] | 749 | return PTR_ERR(midQ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 752 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 753 | cifs_in_send_inc(ses->server); |
Jeff Layton | 0496e02 | 2008-12-30 12:39:16 -0500 | [diff] [blame] | 754 | rc = smb_sendv(ses->server, iov, n_vec); |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 755 | cifs_in_send_dec(ses->server); |
| 756 | cifs_save_when_sent(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 757 | |
Jeff Layton | ad313cb | 2013-04-03 10:27:36 -0400 | [diff] [blame] | 758 | if (rc < 0) |
| 759 | ses->server->sequence_number -= 2; |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 760 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 761 | |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 762 | if (rc < 0) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 763 | cifs_small_buf_release(buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 764 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 765 | } |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 766 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 767 | if (timeout == CIFS_ASYNC_OP) { |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 768 | cifs_small_buf_release(buf); |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 769 | goto out; |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 770 | } |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 771 | |
| 772 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 773 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 774 | send_cancel(ses->server, buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 775 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 776 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 777 | midQ->callback = DeleteMidQEntry; |
| 778 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 779 | cifs_small_buf_release(buf); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 780 | add_credits(ses->server, 1, optype); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 781 | return rc; |
| 782 | } |
| 783 | spin_unlock(&GlobalMid_Lock); |
| 784 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 785 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 786 | cifs_small_buf_release(buf); |
Jeff Layton | 2db7c58 | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 787 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 788 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 789 | if (rc != 0) { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 790 | add_credits(ses->server, 1, optype); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 791 | return rc; |
| 792 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 793 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 794 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 795 | rc = -EIO; |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 796 | cifs_dbg(FYI, "Bad MID state?\n"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 797 | goto out; |
| 798 | } |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 799 | |
Pavel Shilovsky | 792af7b | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 800 | buf = (char *)midQ->resp_buf; |
| 801 | iov[0].iov_base = buf; |
| 802 | iov[0].iov_len = get_rfc1002_length(buf) + 4; |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 803 | if (midQ->large_buf) |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 804 | *resp_buf_type = CIFS_LARGE_BUFFER; |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 805 | else |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 806 | *resp_buf_type = CIFS_SMALL_BUFFER; |
| 807 | |
| 808 | credits = ses->server->ops->get_credits(midQ); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 809 | |
Pavel Shilovsky | 082d064 | 2012-05-17 12:18:21 +0400 | [diff] [blame] | 810 | rc = ses->server->ops->check_receive(midQ, ses->server, |
| 811 | flags & CIFS_LOG_ERROR); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 812 | |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 813 | /* mark it so buf will not be freed by cifs_delete_mid */ |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 814 | if ((flags & CIFS_NO_RESP) == 0) |
| 815 | midQ->resp_buf = NULL; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 816 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 817 | cifs_delete_mid(midQ); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 818 | add_credits(ses->server, credits, optype); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | return rc; |
| 821 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
| 823 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 824 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 826 | int *pbytes_returned, const int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
| 828 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | struct mid_q_entry *midQ; |
| 830 | |
| 831 | if (ses == NULL) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 832 | cifs_dbg(VFS, "Null smb session\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | return -EIO; |
| 834 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 835 | if (ses->server == NULL) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 836 | cifs_dbg(VFS, "Null tcp session\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | return -EIO; |
| 838 | } |
| 839 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 840 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 841 | return -ENOENT; |
| 842 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 843 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | to the same server. We may make this configurable later or |
| 845 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 847 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 848 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 849 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
| 850 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 851 | return -EIO; |
| 852 | } |
| 853 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 854 | rc = wait_for_free_request(ses->server, timeout, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 855 | if (rc) |
| 856 | return rc; |
| 857 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 858 | /* 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] | 859 | and avoid races inside tcp sendmsg code that could cause corruption |
| 860 | of smb data */ |
| 861 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 862 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 864 | rc = allocate_mid(ses, in_buf, &midQ); |
| 865 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 866 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 867 | /* Update # of requests on wire to server */ |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 868 | add_credits(ses->server, 1, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 869 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 872 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 873 | if (rc) { |
| 874 | mutex_unlock(&ses->server->srv_mutex); |
| 875 | goto out; |
| 876 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 878 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 879 | |
| 880 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 881 | 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] | 882 | cifs_in_send_dec(ses->server); |
| 883 | cifs_save_when_sent(midQ); |
Jeff Layton | ad313cb | 2013-04-03 10:27:36 -0400 | [diff] [blame] | 884 | |
| 885 | if (rc < 0) |
| 886 | ses->server->sequence_number -= 2; |
| 887 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 888 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 889 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 890 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 891 | goto out; |
| 892 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 893 | if (timeout == CIFS_ASYNC_OP) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 894 | goto out; |
Jeff Layton | 0ade640 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 895 | |
| 896 | rc = wait_for_response(ses->server, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 897 | if (rc != 0) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 898 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 899 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 900 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 901 | /* no longer considered to be "in-flight" */ |
| 902 | midQ->callback = DeleteMidQEntry; |
| 903 | spin_unlock(&GlobalMid_Lock); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 904 | add_credits(ses->server, 1, 0); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 905 | return rc; |
| 906 | } |
| 907 | spin_unlock(&GlobalMid_Lock); |
| 908 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 910 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 911 | if (rc != 0) { |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 912 | add_credits(ses->server, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | return rc; |
| 914 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 915 | |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 916 | if (!midQ->resp_buf || !out_buf || |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 917 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | rc = -EIO; |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 919 | cifs_dbg(VFS, "Bad MID state?\n"); |
Steve French | 2b2bdfb | 2008-12-11 17:26:54 +0000 | [diff] [blame] | 920 | goto out; |
| 921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 923 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 924 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 925 | rc = cifs_check_receive(midQ, ses->server, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 926 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 927 | cifs_delete_mid(midQ); |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 928 | add_credits(ses->server, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
| 930 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 931 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 933 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 934 | blocking lock to return. */ |
| 935 | |
| 936 | static int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 937 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 938 | struct smb_hdr *in_buf, |
| 939 | struct smb_hdr *out_buf) |
| 940 | { |
| 941 | int bytes_returned; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 942 | struct cifs_ses *ses = tcon->ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 943 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 944 | |
| 945 | /* We just modify the current in_buf to change |
| 946 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 947 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 948 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 949 | |
| 950 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 951 | pSMB->Timeout = 0; |
Pavel Shilovsky | 8825736 | 2012-05-23 14:01:59 +0400 | [diff] [blame] | 952 | pSMB->hdr.Mid = get_next_mid(ses->server); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 953 | |
| 954 | return SendReceive(xid, ses, in_buf, out_buf, |
Jeff Layton | 7749981 | 2011-01-11 07:24:23 -0500 | [diff] [blame] | 955 | &bytes_returned, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 956 | } |
| 957 | |
| 958 | int |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 959 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 960 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 961 | int *pbytes_returned) |
| 962 | { |
| 963 | int rc = 0; |
| 964 | int rstart = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 965 | struct mid_q_entry *midQ; |
Steve French | 96daf2b | 2011-05-27 04:34:02 +0000 | [diff] [blame] | 966 | struct cifs_ses *ses; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 967 | |
| 968 | if (tcon == NULL || tcon->ses == NULL) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 969 | cifs_dbg(VFS, "Null smb session\n"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 970 | return -EIO; |
| 971 | } |
| 972 | ses = tcon->ses; |
| 973 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 974 | if (ses->server == NULL) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 975 | cifs_dbg(VFS, "Null tcp session\n"); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 976 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | } |
| 978 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 979 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 980 | return -ENOENT; |
| 981 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 982 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 983 | to the same server. We may make this configurable later or |
| 984 | use ses->maxReq */ |
| 985 | |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 986 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
| 987 | MAX_CIFS_HDR_SIZE - 4) { |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 988 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
| 989 | be32_to_cpu(in_buf->smb_buf_length)); |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 990 | return -EIO; |
| 991 | } |
| 992 | |
Pavel Shilovsky | a891f0f | 2012-05-23 16:14:34 +0400 | [diff] [blame] | 993 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 994 | if (rc) |
| 995 | return rc; |
| 996 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 997 | /* 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] | 998 | and avoid races inside tcp sendmsg code that could cause corruption |
| 999 | of smb data */ |
| 1000 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 1001 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1002 | |
| 1003 | rc = allocate_mid(ses, in_buf, &midQ); |
| 1004 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 1005 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1006 | return rc; |
| 1007 | } |
| 1008 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1009 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 1010 | if (rc) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1011 | cifs_delete_mid(midQ); |
Volker Lendecke | 829049c | 2008-12-06 16:00:53 +0100 | [diff] [blame] | 1012 | mutex_unlock(&ses->server->srv_mutex); |
| 1013 | return rc; |
| 1014 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1015 | |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 1016 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
Steve French | 789e666 | 2011-08-09 18:44:44 +0000 | [diff] [blame] | 1017 | cifs_in_send_inc(ses->server); |
Steve French | be8e3b0 | 2011-04-29 05:40:20 +0000 | [diff] [blame] | 1018 | 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] | 1019 | cifs_in_send_dec(ses->server); |
| 1020 | cifs_save_when_sent(midQ); |
Jeff Layton | ad313cb | 2013-04-03 10:27:36 -0400 | [diff] [blame] | 1021 | |
| 1022 | if (rc < 0) |
| 1023 | ses->server->sequence_number -= 2; |
| 1024 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 1025 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1026 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1027 | if (rc < 0) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1028 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1029 | return rc; |
| 1030 | } |
| 1031 | |
| 1032 | /* Wait for a reply - allow signals to interrupt. */ |
| 1033 | rc = wait_event_interruptible(ses->server->response_q, |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 1034 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1035 | ((ses->server->tcpStatus != CifsGood) && |
| 1036 | (ses->server->tcpStatus != CifsNew))); |
| 1037 | |
| 1038 | /* Were we interrupted by a signal ? */ |
| 1039 | if ((rc == -ERESTARTSYS) && |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 1040 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1041 | ((ses->server->tcpStatus == CifsGood) || |
| 1042 | (ses->server->tcpStatus == CifsNew))) { |
| 1043 | |
| 1044 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 1045 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 1046 | blocking lock to return. */ |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 1047 | rc = send_cancel(ses->server, in_buf, midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1048 | if (rc) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1049 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1050 | return rc; |
| 1051 | } |
| 1052 | } else { |
| 1053 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 1054 | to cause the blocking lock to return. */ |
| 1055 | |
| 1056 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 1057 | |
| 1058 | /* If we get -ENOLCK back the lock may have |
| 1059 | already been removed. Don't exit in this case. */ |
| 1060 | if (rc && rc != -ENOLCK) { |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1061 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1062 | return rc; |
| 1063 | } |
| 1064 | } |
| 1065 | |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 1066 | rc = wait_for_response(ses->server, midQ); |
| 1067 | if (rc) { |
Jeff Layton | 121b046 | 2012-05-15 12:21:10 -0400 | [diff] [blame] | 1068 | send_cancel(ses->server, in_buf, midQ); |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 1069 | spin_lock(&GlobalMid_Lock); |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 1070 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 1071 | /* no longer considered to be "in-flight" */ |
| 1072 | midQ->callback = DeleteMidQEntry; |
| 1073 | spin_unlock(&GlobalMid_Lock); |
| 1074 | return rc; |
| 1075 | } |
| 1076 | spin_unlock(&GlobalMid_Lock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1077 | } |
Jeff Layton | 1be912d | 2011-01-28 07:08:28 -0500 | [diff] [blame] | 1078 | |
| 1079 | /* We got the response - restart system call. */ |
| 1080 | rstart = 1; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1081 | } |
| 1082 | |
Jeff Layton | 3c1105d | 2011-05-22 07:09:13 -0400 | [diff] [blame] | 1083 | rc = cifs_sync_mid_result(midQ, ses->server); |
Jeff Layton | 053d503 | 2011-01-11 07:24:02 -0500 | [diff] [blame] | 1084 | if (rc != 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1085 | return rc; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1086 | |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 1087 | /* rcvd frame is ok */ |
Pavel Shilovsky | 7c9421e | 2012-03-23 14:28:03 -0400 | [diff] [blame] | 1088 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 1089 | rc = -EIO; |
Joe Perches | f96637b | 2013-05-04 22:12:25 -0500 | [diff] [blame] | 1090 | cifs_dbg(VFS, "Bad MID state?\n"); |
Volker Lendecke | 698e96a | 2008-12-06 16:39:31 +0100 | [diff] [blame] | 1091 | goto out; |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 1092 | } |
| 1093 | |
Pavel Shilovsky | d4e4854 | 2012-03-23 14:28:02 -0400 | [diff] [blame] | 1094 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
Jeff Layton | 2c8f981 | 2011-05-19 16:22:52 -0400 | [diff] [blame] | 1095 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
| 1096 | rc = cifs_check_receive(midQ, ses->server, 0); |
Volker Lendecke | 17c8bfe | 2008-12-06 16:38:19 +0100 | [diff] [blame] | 1097 | out: |
Pavel Shilovsky | 3c1bf7e | 2012-09-18 16:20:30 -0700 | [diff] [blame] | 1098 | cifs_delete_mid(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1099 | if (rstart && rc == -EACCES) |
| 1100 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | return rc; |
| 1102 | } |