Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/transport.c |
| 3 | * |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 4 | * Copyright (C) International Business Machines Corp., 2002,2005 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Lesser General Public License as published |
| 9 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | * the GNU Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public License |
| 18 | * along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/list.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/net.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/processor.h> |
| 29 | #include <linux/mempool.h> |
| 30 | #include "cifspdu.h" |
| 31 | #include "cifsglob.h" |
| 32 | #include "cifsproto.h" |
| 33 | #include "cifs_debug.h" |
| 34 | |
| 35 | extern mempool_t *cifs_mid_poolp; |
| 36 | extern kmem_cache_t *cifs_oplock_cachep; |
| 37 | |
| 38 | static struct mid_q_entry * |
| 39 | AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
| 40 | { |
| 41 | struct mid_q_entry *temp; |
| 42 | |
| 43 | if (ses == NULL) { |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 44 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | return NULL; |
| 46 | } |
| 47 | if (ses->server == NULL) { |
| 48 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
| 49 | return NULL; |
| 50 | } |
| 51 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 52 | temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp, |
| 53 | SLAB_KERNEL | SLAB_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | if (temp == NULL) |
| 55 | return temp; |
| 56 | else { |
| 57 | memset(temp, 0, sizeof (struct mid_q_entry)); |
| 58 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 59 | temp->pid = current->pid; |
| 60 | temp->command = smb_buffer->Command; |
| 61 | cFYI(1, ("For smb_command %d", temp->command)); |
| 62 | do_gettimeofday(&temp->when_sent); |
| 63 | temp->ses = ses; |
| 64 | temp->tsk = current; |
| 65 | } |
| 66 | |
| 67 | spin_lock(&GlobalMid_Lock); |
| 68 | list_add_tail(&temp->qhead, &ses->server->pending_mid_q); |
| 69 | atomic_inc(&midCount); |
| 70 | temp->midState = MID_REQUEST_ALLOCATED; |
| 71 | spin_unlock(&GlobalMid_Lock); |
| 72 | return temp; |
| 73 | } |
| 74 | |
| 75 | static void |
| 76 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 77 | { |
| 78 | spin_lock(&GlobalMid_Lock); |
| 79 | midEntry->midState = MID_FREE; |
| 80 | list_del(&midEntry->qhead); |
| 81 | atomic_dec(&midCount); |
| 82 | spin_unlock(&GlobalMid_Lock); |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 83 | if(midEntry->largeBuf) |
| 84 | cifs_buf_release(midEntry->resp_buf); |
| 85 | else |
| 86 | cifs_small_buf_release(midEntry->resp_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | mempool_free(midEntry, cifs_mid_poolp); |
| 88 | } |
| 89 | |
| 90 | struct oplock_q_entry * |
| 91 | AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon) |
| 92 | { |
| 93 | struct oplock_q_entry *temp; |
| 94 | if ((pinode== NULL) || (tcon == NULL)) { |
| 95 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
| 96 | return NULL; |
| 97 | } |
| 98 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, |
| 99 | SLAB_KERNEL); |
| 100 | if (temp == NULL) |
| 101 | return temp; |
| 102 | else { |
| 103 | temp->pinode = pinode; |
| 104 | temp->tcon = tcon; |
| 105 | temp->netfid = fid; |
| 106 | spin_lock(&GlobalMid_Lock); |
| 107 | list_add_tail(&temp->qhead, &GlobalOplock_Q); |
| 108 | spin_unlock(&GlobalMid_Lock); |
| 109 | } |
| 110 | return temp; |
| 111 | |
| 112 | } |
| 113 | |
| 114 | void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry) |
| 115 | { |
| 116 | spin_lock(&GlobalMid_Lock); |
| 117 | /* should we check if list empty first? */ |
| 118 | list_del(&oplockEntry->qhead); |
| 119 | spin_unlock(&GlobalMid_Lock); |
| 120 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, |
| 125 | unsigned int smb_buf_length, struct sockaddr *sin) |
| 126 | { |
| 127 | int rc = 0; |
| 128 | int i = 0; |
| 129 | struct msghdr smb_msg; |
| 130 | struct kvec iov; |
| 131 | unsigned len = smb_buf_length + 4; |
| 132 | |
| 133 | if(ssocket == NULL) |
| 134 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
| 135 | iov.iov_base = smb_buffer; |
| 136 | iov.iov_len = len; |
| 137 | |
| 138 | smb_msg.msg_name = sin; |
| 139 | smb_msg.msg_namelen = sizeof (struct sockaddr); |
| 140 | smb_msg.msg_control = NULL; |
| 141 | smb_msg.msg_controllen = 0; |
| 142 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| 143 | |
| 144 | /* smb header is converted in header_assemble. bcc and rest of SMB word |
| 145 | area, and byte area if necessary, is converted to littleendian in |
| 146 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
| 147 | Flags2 is converted in SendReceive */ |
| 148 | |
| 149 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 150 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | dump_smb(smb_buffer, len); |
| 152 | |
| 153 | while (len > 0) { |
| 154 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); |
| 155 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 156 | i++; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 157 | /* smaller timeout here than send2 since smaller size */ |
| 158 | /* Although it may not be required, this also is smaller |
| 159 | oplock break time */ |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 160 | if(i > 12) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 162 | ("sends on sock %p stuck for 7 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | ssocket)); |
| 164 | rc = -EAGAIN; |
| 165 | break; |
| 166 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 167 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | continue; |
| 169 | } |
| 170 | if (rc < 0) |
| 171 | break; |
| 172 | iov.iov_base += rc; |
| 173 | iov.iov_len -= rc; |
| 174 | len -= rc; |
| 175 | } |
| 176 | |
| 177 | if (rc < 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 178 | cERROR(1,("Error %d sending data on socket to server", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } else { |
| 180 | rc = 0; |
| 181 | } |
| 182 | |
| 183 | return rc; |
| 184 | } |
| 185 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 186 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 187 | static int |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 188 | smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec, |
| 189 | struct sockaddr *sin) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | { |
| 191 | int rc = 0; |
| 192 | int i = 0; |
| 193 | struct msghdr smb_msg; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 194 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
| 195 | unsigned int len = iov[0].iov_len; |
| 196 | unsigned int total_len; |
| 197 | int first_vec = 0; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | if(ssocket == NULL) |
| 200 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | smb_msg.msg_name = sin; |
| 203 | smb_msg.msg_namelen = sizeof (struct sockaddr); |
| 204 | smb_msg.msg_control = NULL; |
| 205 | smb_msg.msg_controllen = 0; |
| 206 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| 207 | |
| 208 | /* smb header is converted in header_assemble. bcc and rest of SMB word |
| 209 | area, and byte area if necessary, is converted to littleendian in |
| 210 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
| 211 | Flags2 is converted in SendReceive */ |
| 212 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 213 | |
| 214 | total_len = 0; |
| 215 | for (i = 0; i < n_vec; i++) |
| 216 | total_len += iov[i].iov_len; |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 219 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | dump_smb(smb_buffer, len); |
| 221 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 222 | while (total_len) { |
| 223 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
| 224 | n_vec - first_vec, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 226 | i++; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 227 | if(i >= 14) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 229 | ("sends on sock %p stuck for 15 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | ssocket)); |
| 231 | rc = -EAGAIN; |
| 232 | break; |
| 233 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 234 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | continue; |
| 236 | } |
| 237 | if (rc < 0) |
| 238 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 239 | |
| 240 | if (rc >= total_len) { |
| 241 | WARN_ON(rc > total_len); |
| 242 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 243 | } |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 244 | if(rc == 0) { |
| 245 | /* should never happen, letting socket clear before |
| 246 | retrying is our only obvious option here */ |
Steve French | 04c0881 | 2005-10-03 19:33:15 -0700 | [diff] [blame] | 247 | cERROR(1,("tcp sent no data")); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 248 | msleep(500); |
| 249 | continue; |
| 250 | } |
| 251 | total_len -= rc; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame^] | 252 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 253 | for (i = first_vec; i < n_vec; i++) { |
| 254 | if (iov[i].iov_len) { |
| 255 | if (rc > iov[i].iov_len) { |
| 256 | rc -= iov[i].iov_len; |
| 257 | iov[i].iov_len = 0; |
| 258 | } else { |
| 259 | iov[i].iov_base += rc; |
| 260 | iov[i].iov_len -= rc; |
| 261 | first_vec = i; |
| 262 | break; |
| 263 | } |
| 264 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 265 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | if (rc < 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 269 | cERROR(1,("Error %d sending data on socket to server", rc)); |
| 270 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | return rc; |
| 274 | } |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | int |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 277 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 278 | struct kvec *iov, int n_vec, int *pbytes_returned, |
| 279 | const int long_op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | int rc = 0; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 282 | unsigned int receive_len; |
| 283 | unsigned long timeout; |
| 284 | struct mid_q_entry *midQ; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 285 | struct smb_hdr *in_buf = iov[0].iov_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | if (ses == NULL) { |
| 288 | cERROR(1,("Null smb session")); |
| 289 | return -EIO; |
| 290 | } |
| 291 | if(ses->server == NULL) { |
| 292 | cERROR(1,("Null tcp session")); |
| 293 | return -EIO; |
| 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 296 | if(ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 297 | return -ENOENT; |
| 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* Ensure that we do not send more than 50 overlapping requests |
| 300 | to the same server. We may make this configurable later or |
| 301 | use ses->maxReq */ |
| 302 | if(long_op == -1) { |
| 303 | /* oplock breaks must not be held up */ |
| 304 | atomic_inc(&ses->server->inFlight); |
| 305 | } else { |
| 306 | spin_lock(&GlobalMid_Lock); |
| 307 | while(1) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 308 | if(atomic_read(&ses->server->inFlight) >= |
| 309 | cifs_max_pending){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | spin_unlock(&GlobalMid_Lock); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 311 | #ifdef CONFIG_CIFS_STATS2 |
| 312 | atomic_inc(&ses->server->num_waiters); |
| 313 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | wait_event(ses->server->request_q, |
| 315 | atomic_read(&ses->server->inFlight) |
| 316 | < cifs_max_pending); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 317 | #ifdef CONFIG_CIFS_STATS2 |
| 318 | atomic_dec(&ses->server->num_waiters); |
| 319 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | spin_lock(&GlobalMid_Lock); |
| 321 | } else { |
| 322 | if(ses->server->tcpStatus == CifsExiting) { |
| 323 | spin_unlock(&GlobalMid_Lock); |
| 324 | return -ENOENT; |
| 325 | } |
| 326 | |
| 327 | /* can not count locking commands against total since |
| 328 | they are allowed to block on server */ |
| 329 | |
| 330 | if(long_op < 3) { |
| 331 | /* update # of requests on the wire to server */ |
| 332 | atomic_inc(&ses->server->inFlight); |
| 333 | } |
| 334 | spin_unlock(&GlobalMid_Lock); |
| 335 | break; |
| 336 | } |
| 337 | } |
| 338 | } |
| 339 | /* make sure that we sign in the same order that we send on this socket |
| 340 | and avoid races inside tcp sendmsg code that could cause corruption |
| 341 | of smb data */ |
| 342 | |
| 343 | down(&ses->server->tcpSem); |
| 344 | |
| 345 | if (ses->server->tcpStatus == CifsExiting) { |
| 346 | rc = -ENOENT; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 347 | goto out_unlock2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
| 349 | cFYI(1,("tcp session dead - return to caller to retry")); |
| 350 | rc = -EAGAIN; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 351 | goto out_unlock2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } else if (ses->status != CifsGood) { |
| 353 | /* check if SMB session is bad because we are setting it up */ |
| 354 | if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
| 355 | (in_buf->Command != SMB_COM_NEGOTIATE)) { |
| 356 | rc = -EAGAIN; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 357 | goto out_unlock2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } /* else ok - we are setting up session */ |
| 359 | } |
| 360 | midQ = AllocMidQEntry(in_buf, ses); |
| 361 | if (midQ == NULL) { |
| 362 | up(&ses->server->tcpSem); |
| 363 | /* If not lock req, update # of requests on wire to server */ |
| 364 | if(long_op < 3) { |
| 365 | atomic_dec(&ses->server->inFlight); |
| 366 | wake_up(&ses->server->request_q); |
| 367 | } |
| 368 | return -ENOMEM; |
| 369 | } |
| 370 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 371 | /* BB FIXME */ |
Steve French | 4a77118 | 2005-10-05 15:14:33 -0700 | [diff] [blame] | 372 | /* rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 375 | #ifdef CONFIG_CIFS_STATS2 |
| 376 | atomic_inc(&ses->server->inSend); |
| 377 | #endif |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 378 | rc = smb_send2(ses->server->ssocket, iov, n_vec, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 379 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 380 | #ifdef CONFIG_CIFS_STATS2 |
| 381 | atomic_dec(&ses->server->inSend); |
| 382 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if(rc < 0) { |
| 384 | DeleteMidQEntry(midQ); |
| 385 | up(&ses->server->tcpSem); |
| 386 | /* If not lock req, update # of requests on wire to server */ |
| 387 | if(long_op < 3) { |
| 388 | atomic_dec(&ses->server->inFlight); |
| 389 | wake_up(&ses->server->request_q); |
| 390 | } |
| 391 | return rc; |
| 392 | } else |
| 393 | up(&ses->server->tcpSem); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 394 | if (long_op == -1) |
| 395 | goto cifs_no_response_exit2; |
| 396 | else if (long_op == 2) /* writes past end of file can take loong time */ |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 397 | timeout = 180 * HZ; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 398 | else if (long_op == 1) |
| 399 | timeout = 45 * HZ; /* should be greater than |
| 400 | servers oplock break timeout (about 43 seconds) */ |
| 401 | else if (long_op > 2) { |
| 402 | timeout = MAX_SCHEDULE_TIMEOUT; |
| 403 | } else |
| 404 | timeout = 15 * HZ; |
| 405 | /* wait for 15 seconds or until woken up due to response arriving or |
| 406 | due to last connection to this server being unmounted */ |
| 407 | if (signal_pending(current)) { |
| 408 | /* if signal pending do not hold up user for full smb timeout |
| 409 | but we still give response a change to complete */ |
| 410 | timeout = 2 * HZ; |
| 411 | } |
| 412 | |
| 413 | /* No user interrupts in wait - wreaks havoc with performance */ |
| 414 | if(timeout != MAX_SCHEDULE_TIMEOUT) { |
| 415 | timeout += jiffies; |
| 416 | wait_event(ses->server->response_q, |
| 417 | (!(midQ->midState & MID_REQUEST_SUBMITTED)) || |
| 418 | time_after(jiffies, timeout) || |
| 419 | ((ses->server->tcpStatus != CifsGood) && |
| 420 | (ses->server->tcpStatus != CifsNew))); |
| 421 | } else { |
| 422 | wait_event(ses->server->response_q, |
| 423 | (!(midQ->midState & MID_REQUEST_SUBMITTED)) || |
| 424 | ((ses->server->tcpStatus != CifsGood) && |
| 425 | (ses->server->tcpStatus != CifsNew))); |
| 426 | } |
| 427 | |
| 428 | spin_lock(&GlobalMid_Lock); |
| 429 | if (midQ->resp_buf) { |
| 430 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 431 | receive_len = midQ->resp_buf->smb_buf_length; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 432 | } else { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 433 | cERROR(1,("No response to cmd %d mid %d", |
| 434 | midQ->command, midQ->mid)); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 435 | if(midQ->midState == MID_REQUEST_SUBMITTED) { |
| 436 | if(ses->server->tcpStatus == CifsExiting) |
| 437 | rc = -EHOSTDOWN; |
| 438 | else { |
| 439 | ses->server->tcpStatus = CifsNeedReconnect; |
| 440 | midQ->midState = MID_RETRY_NEEDED; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | if (rc != -EHOSTDOWN) { |
| 445 | if(midQ->midState == MID_RETRY_NEEDED) { |
| 446 | rc = -EAGAIN; |
| 447 | cFYI(1,("marking request for retry")); |
| 448 | } else { |
| 449 | rc = -EIO; |
| 450 | } |
| 451 | } |
| 452 | spin_unlock(&GlobalMid_Lock); |
| 453 | DeleteMidQEntry(midQ); |
| 454 | /* If not lock req, update # of requests on wire to server */ |
| 455 | if(long_op < 3) { |
| 456 | atomic_dec(&ses->server->inFlight); |
| 457 | wake_up(&ses->server->request_q); |
| 458 | } |
| 459 | return rc; |
| 460 | } |
| 461 | |
| 462 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| 463 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| 464 | receive_len, xid)); |
| 465 | rc = -EIO; |
| 466 | } else { /* rcvd frame is ok */ |
| 467 | |
| 468 | if (midQ->resp_buf && |
| 469 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 470 | in_buf->smb_buf_length = receive_len; |
| 471 | /* BB verify that length would not overrun small buf */ |
| 472 | memcpy((char *)in_buf + 4, |
| 473 | (char *)midQ->resp_buf + 4, |
| 474 | receive_len); |
| 475 | |
| 476 | dump_smb(in_buf, 80); |
| 477 | /* convert the length into a more usable form */ |
| 478 | if((receive_len > 24) && |
| 479 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 480 | SECMODE_SIGN_ENABLED))) { |
| 481 | rc = cifs_verify_signature(in_buf, |
| 482 | ses->server->mac_signing_key, |
| 483 | midQ->sequence_number+1); |
| 484 | if(rc) { |
| 485 | cERROR(1,("Unexpected SMB signature")); |
| 486 | /* BB FIXME add code to kill session */ |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | *pbytes_returned = in_buf->smb_buf_length; |
| 491 | |
| 492 | /* BB special case reconnect tid and uid here? */ |
| 493 | rc = map_smb_to_linux_error(in_buf); |
| 494 | |
| 495 | /* convert ByteCount if necessary */ |
| 496 | if (receive_len >= |
| 497 | sizeof (struct smb_hdr) - |
| 498 | 4 /* do not count RFC1001 header */ + |
| 499 | (2 * in_buf->WordCount) + 2 /* bcc */ ) |
| 500 | BCC(in_buf) = le16_to_cpu(BCC(in_buf)); |
| 501 | } else { |
| 502 | rc = -EIO; |
Steve French | ab2f218 | 2005-09-15 20:44:50 -0700 | [diff] [blame] | 503 | cFYI(1,("Bad MID state?")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 504 | } |
| 505 | } |
| 506 | cifs_no_response_exit2: |
| 507 | DeleteMidQEntry(midQ); |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if(long_op < 3) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 510 | atomic_dec(&ses->server->inFlight); |
| 511 | wake_up(&ses->server->request_q); |
| 512 | } |
| 513 | |
| 514 | return rc; |
| 515 | |
| 516 | out_unlock2: |
| 517 | up(&ses->server->tcpSem); |
| 518 | /* If not lock req, update # of requests on wire to server */ |
| 519 | if(long_op < 3) { |
| 520 | atomic_dec(&ses->server->inFlight); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | wake_up(&ses->server->request_q); |
| 522 | } |
| 523 | |
| 524 | return rc; |
| 525 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | #endif /* CIFS_EXPERIMENTAL */ |
| 527 | |
| 528 | int |
| 529 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, |
| 530 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 531 | int *pbytes_returned, const int long_op) |
| 532 | { |
| 533 | int rc = 0; |
| 534 | unsigned int receive_len; |
| 535 | unsigned long timeout; |
| 536 | struct mid_q_entry *midQ; |
| 537 | |
| 538 | if (ses == NULL) { |
| 539 | cERROR(1,("Null smb session")); |
| 540 | return -EIO; |
| 541 | } |
| 542 | if(ses->server == NULL) { |
| 543 | cERROR(1,("Null tcp session")); |
| 544 | return -EIO; |
| 545 | } |
| 546 | |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 547 | if(ses->server->tcpStatus == CifsExiting) |
| 548 | return -ENOENT; |
| 549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | /* Ensure that we do not send more than 50 overlapping requests |
| 551 | to the same server. We may make this configurable later or |
| 552 | use ses->maxReq */ |
| 553 | if(long_op == -1) { |
| 554 | /* oplock breaks must not be held up */ |
| 555 | atomic_inc(&ses->server->inFlight); |
| 556 | } else { |
| 557 | spin_lock(&GlobalMid_Lock); |
| 558 | while(1) { |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 559 | if(atomic_read(&ses->server->inFlight) >= |
| 560 | cifs_max_pending){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | spin_unlock(&GlobalMid_Lock); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 562 | #ifdef CONFIG_CIFS_STATS2 |
| 563 | atomic_inc(&ses->server->num_waiters); |
| 564 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | wait_event(ses->server->request_q, |
| 566 | atomic_read(&ses->server->inFlight) |
| 567 | < cifs_max_pending); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 568 | #ifdef CONFIG_CIFS_STATS2 |
| 569 | atomic_dec(&ses->server->num_waiters); |
| 570 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | spin_lock(&GlobalMid_Lock); |
| 572 | } else { |
| 573 | if(ses->server->tcpStatus == CifsExiting) { |
| 574 | spin_unlock(&GlobalMid_Lock); |
| 575 | return -ENOENT; |
| 576 | } |
| 577 | |
| 578 | /* can not count locking commands against total since |
| 579 | they are allowed to block on server */ |
| 580 | |
| 581 | if(long_op < 3) { |
| 582 | /* update # of requests on the wire to server */ |
| 583 | atomic_inc(&ses->server->inFlight); |
| 584 | } |
| 585 | spin_unlock(&GlobalMid_Lock); |
| 586 | break; |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | /* make sure that we sign in the same order that we send on this socket |
| 591 | and avoid races inside tcp sendmsg code that could cause corruption |
| 592 | of smb data */ |
| 593 | |
| 594 | down(&ses->server->tcpSem); |
| 595 | |
| 596 | if (ses->server->tcpStatus == CifsExiting) { |
| 597 | rc = -ENOENT; |
| 598 | goto out_unlock; |
| 599 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
| 600 | cFYI(1,("tcp session dead - return to caller to retry")); |
| 601 | rc = -EAGAIN; |
| 602 | goto out_unlock; |
| 603 | } else if (ses->status != CifsGood) { |
| 604 | /* check if SMB session is bad because we are setting it up */ |
| 605 | if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
| 606 | (in_buf->Command != SMB_COM_NEGOTIATE)) { |
| 607 | rc = -EAGAIN; |
| 608 | goto out_unlock; |
| 609 | } /* else ok - we are setting up session */ |
| 610 | } |
| 611 | midQ = AllocMidQEntry(in_buf, ses); |
| 612 | if (midQ == NULL) { |
| 613 | up(&ses->server->tcpSem); |
| 614 | /* If not lock req, update # of requests on wire to server */ |
| 615 | if(long_op < 3) { |
| 616 | atomic_dec(&ses->server->inFlight); |
| 617 | wake_up(&ses->server->request_q); |
| 618 | } |
| 619 | return -ENOMEM; |
| 620 | } |
| 621 | |
| 622 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| 623 | up(&ses->server->tcpSem); |
| 624 | cERROR(1, |
| 625 | ("Illegal length, greater than maximum frame, %d ", |
| 626 | in_buf->smb_buf_length)); |
| 627 | DeleteMidQEntry(midQ); |
| 628 | /* If not lock req, update # of requests on wire to server */ |
| 629 | if(long_op < 3) { |
| 630 | atomic_dec(&ses->server->inFlight); |
| 631 | wake_up(&ses->server->request_q); |
| 632 | } |
| 633 | return -EIO; |
| 634 | } |
| 635 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 636 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
| 638 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 639 | #ifdef CONFIG_CIFS_STATS2 |
| 640 | atomic_inc(&ses->server->inSend); |
| 641 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| 643 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 644 | #ifdef CONFIG_CIFS_STATS2 |
| 645 | atomic_dec(&ses->server->inSend); |
| 646 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | if(rc < 0) { |
| 648 | DeleteMidQEntry(midQ); |
| 649 | up(&ses->server->tcpSem); |
| 650 | /* If not lock req, update # of requests on wire to server */ |
| 651 | if(long_op < 3) { |
| 652 | atomic_dec(&ses->server->inFlight); |
| 653 | wake_up(&ses->server->request_q); |
| 654 | } |
| 655 | return rc; |
| 656 | } else |
| 657 | up(&ses->server->tcpSem); |
| 658 | if (long_op == -1) |
| 659 | goto cifs_no_response_exit; |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 660 | else if (long_op == 2) /* writes past end of file can take loong time */ |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 661 | timeout = 180 * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | else if (long_op == 1) |
| 663 | timeout = 45 * HZ; /* should be greater than |
| 664 | servers oplock break timeout (about 43 seconds) */ |
| 665 | else if (long_op > 2) { |
| 666 | timeout = MAX_SCHEDULE_TIMEOUT; |
| 667 | } else |
| 668 | timeout = 15 * HZ; |
| 669 | /* wait for 15 seconds or until woken up due to response arriving or |
| 670 | due to last connection to this server being unmounted */ |
| 671 | if (signal_pending(current)) { |
| 672 | /* if signal pending do not hold up user for full smb timeout |
| 673 | but we still give response a change to complete */ |
| 674 | timeout = 2 * HZ; |
| 675 | } |
| 676 | |
| 677 | /* No user interrupts in wait - wreaks havoc with performance */ |
| 678 | if(timeout != MAX_SCHEDULE_TIMEOUT) { |
| 679 | timeout += jiffies; |
| 680 | wait_event(ses->server->response_q, |
| 681 | (!(midQ->midState & MID_REQUEST_SUBMITTED)) || |
| 682 | time_after(jiffies, timeout) || |
| 683 | ((ses->server->tcpStatus != CifsGood) && |
| 684 | (ses->server->tcpStatus != CifsNew))); |
| 685 | } else { |
| 686 | wait_event(ses->server->response_q, |
| 687 | (!(midQ->midState & MID_REQUEST_SUBMITTED)) || |
| 688 | ((ses->server->tcpStatus != CifsGood) && |
| 689 | (ses->server->tcpStatus != CifsNew))); |
| 690 | } |
| 691 | |
| 692 | spin_lock(&GlobalMid_Lock); |
| 693 | if (midQ->resp_buf) { |
| 694 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 695 | receive_len = midQ->resp_buf->smb_buf_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } else { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 697 | cERROR(1,("No response for cmd %d mid %d", |
| 698 | midQ->command, midQ->mid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | if(midQ->midState == MID_REQUEST_SUBMITTED) { |
| 700 | if(ses->server->tcpStatus == CifsExiting) |
| 701 | rc = -EHOSTDOWN; |
| 702 | else { |
| 703 | ses->server->tcpStatus = CifsNeedReconnect; |
| 704 | midQ->midState = MID_RETRY_NEEDED; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | if (rc != -EHOSTDOWN) { |
| 709 | if(midQ->midState == MID_RETRY_NEEDED) { |
| 710 | rc = -EAGAIN; |
| 711 | cFYI(1,("marking request for retry")); |
| 712 | } else { |
| 713 | rc = -EIO; |
| 714 | } |
| 715 | } |
| 716 | spin_unlock(&GlobalMid_Lock); |
| 717 | DeleteMidQEntry(midQ); |
| 718 | /* If not lock req, update # of requests on wire to server */ |
| 719 | if(long_op < 3) { |
| 720 | atomic_dec(&ses->server->inFlight); |
| 721 | wake_up(&ses->server->request_q); |
| 722 | } |
| 723 | return rc; |
| 724 | } |
| 725 | |
| 726 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 727 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | receive_len, xid)); |
| 729 | rc = -EIO; |
| 730 | } else { /* rcvd frame is ok */ |
| 731 | |
| 732 | if (midQ->resp_buf && out_buf |
| 733 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 734 | out_buf->smb_buf_length = receive_len; |
| 735 | memcpy((char *)out_buf + 4, |
| 736 | (char *)midQ->resp_buf + 4, |
| 737 | receive_len); |
| 738 | |
| 739 | dump_smb(out_buf, 92); |
| 740 | /* convert the length into a more usable form */ |
| 741 | if((receive_len > 24) && |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 742 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 743 | SECMODE_SIGN_ENABLED))) { |
| 744 | rc = cifs_verify_signature(out_buf, |
| 745 | ses->server->mac_signing_key, |
| 746 | midQ->sequence_number+1); |
| 747 | if(rc) { |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 748 | cERROR(1,("Unexpected SMB signature")); |
| 749 | /* BB FIXME add code to kill session */ |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | *pbytes_returned = out_buf->smb_buf_length; |
| 754 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 755 | /* BB special case reconnect tid and uid here? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | rc = map_smb_to_linux_error(out_buf); |
| 757 | |
| 758 | /* convert ByteCount if necessary */ |
| 759 | if (receive_len >= |
| 760 | sizeof (struct smb_hdr) - |
| 761 | 4 /* do not count RFC1001 header */ + |
| 762 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| 763 | BCC(out_buf) = le16_to_cpu(BCC(out_buf)); |
| 764 | } else { |
| 765 | rc = -EIO; |
Steve French | a5a2b48 | 2005-08-20 21:42:53 -0700 | [diff] [blame] | 766 | cERROR(1,("Bad MID state? ")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | } |
| 769 | cifs_no_response_exit: |
| 770 | DeleteMidQEntry(midQ); |
| 771 | |
| 772 | if(long_op < 3) { |
| 773 | atomic_dec(&ses->server->inFlight); |
| 774 | wake_up(&ses->server->request_q); |
| 775 | } |
| 776 | |
| 777 | return rc; |
| 778 | |
| 779 | out_unlock: |
| 780 | up(&ses->server->tcpSem); |
| 781 | /* If not lock req, update # of requests on wire to server */ |
| 782 | if(long_op < 3) { |
| 783 | atomic_dec(&ses->server->inFlight); |
| 784 | wake_up(&ses->server->request_q); |
| 785 | } |
| 786 | |
| 787 | return rc; |
| 788 | } |