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> |
| 25 | #include <linux/wait.h> |
| 26 | #include <linux/net.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/processor.h> |
| 30 | #include <linux/mempool.h> |
| 31 | #include "cifspdu.h" |
| 32 | #include "cifsglob.h" |
| 33 | #include "cifsproto.h" |
| 34 | #include "cifs_debug.h" |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | extern mempool_t *cifs_mid_poolp; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 37 | extern struct kmem_cache *cifs_oplock_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static struct mid_q_entry * |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | struct mid_q_entry *temp; |
| 43 | |
| 44 | if (ses == NULL) { |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 45 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | return NULL; |
| 47 | } |
| 48 | if (ses->server == NULL) { |
| 49 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
| 50 | return NULL; |
| 51 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 52 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 53 | temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 54 | GFP_KERNEL | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | if (temp == NULL) |
| 56 | return temp; |
| 57 | else { |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 58 | memset(temp, 0, sizeof(struct mid_q_entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 60 | temp->pid = current->pid; |
| 61 | temp->command = smb_buffer->Command; |
| 62 | cFYI(1, ("For smb_command %d", temp->command)); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 63 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| 64 | /* when mid allocated can be before when sent */ |
| 65 | temp->when_alloc = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | temp->ses = ses; |
| 67 | temp->tsk = current; |
| 68 | } |
| 69 | |
| 70 | spin_lock(&GlobalMid_Lock); |
| 71 | list_add_tail(&temp->qhead, &ses->server->pending_mid_q); |
| 72 | atomic_inc(&midCount); |
| 73 | temp->midState = MID_REQUEST_ALLOCATED; |
| 74 | spin_unlock(&GlobalMid_Lock); |
| 75 | return temp; |
| 76 | } |
| 77 | |
| 78 | static void |
| 79 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 80 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 81 | #ifdef CONFIG_CIFS_STATS2 |
| 82 | unsigned long now; |
| 83 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | spin_lock(&GlobalMid_Lock); |
| 85 | midEntry->midState = MID_FREE; |
| 86 | list_del(&midEntry->qhead); |
| 87 | atomic_dec(&midCount); |
| 88 | spin_unlock(&GlobalMid_Lock); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 89 | if (midEntry->largeBuf) |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 90 | cifs_buf_release(midEntry->resp_buf); |
| 91 | else |
| 92 | cifs_small_buf_release(midEntry->resp_buf); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 93 | #ifdef CONFIG_CIFS_STATS2 |
| 94 | now = jiffies; |
| 95 | /* commands taking longer than one second are indications that |
| 96 | something is wrong, unless it is quite a slow link or server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 97 | if ((now - midEntry->when_alloc) > HZ) { |
| 98 | if ((cifsFYI & CIFS_TIMER) && |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 99 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
| 100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", |
| 101 | midEntry->command, midEntry->mid); |
| 102 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 103 | now - midEntry->when_alloc, |
| 104 | now - midEntry->when_sent, |
| 105 | now - midEntry->when_received); |
| 106 | } |
| 107 | } |
| 108 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | mempool_free(midEntry, cifs_mid_poolp); |
| 110 | } |
| 111 | |
| 112 | struct oplock_q_entry * |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 113 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | struct oplock_q_entry *temp; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 116 | if ((pinode == NULL) || (tcon == NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
| 118 | return NULL; |
| 119 | } |
| 120 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 121 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | if (temp == NULL) |
| 123 | return temp; |
| 124 | else { |
| 125 | temp->pinode = pinode; |
| 126 | temp->tcon = tcon; |
| 127 | temp->netfid = fid; |
| 128 | spin_lock(&GlobalMid_Lock); |
| 129 | list_add_tail(&temp->qhead, &GlobalOplock_Q); |
| 130 | spin_unlock(&GlobalMid_Lock); |
| 131 | } |
| 132 | return temp; |
| 133 | |
| 134 | } |
| 135 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 136 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 138 | spin_lock(&GlobalMid_Lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* should we check if list empty first? */ |
| 140 | list_del(&oplockEntry->qhead); |
| 141 | spin_unlock(&GlobalMid_Lock); |
| 142 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); |
| 143 | } |
| 144 | |
| 145 | int |
| 146 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, |
| 147 | unsigned int smb_buf_length, struct sockaddr *sin) |
| 148 | { |
| 149 | int rc = 0; |
| 150 | int i = 0; |
| 151 | struct msghdr smb_msg; |
| 152 | struct kvec iov; |
| 153 | unsigned len = smb_buf_length + 4; |
| 154 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 155 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
| 157 | iov.iov_base = smb_buffer; |
| 158 | iov.iov_len = len; |
| 159 | |
| 160 | smb_msg.msg_name = sin; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 161 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | smb_msg.msg_control = NULL; |
| 163 | smb_msg.msg_controllen = 0; |
| 164 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| 165 | |
| 166 | /* smb header is converted in header_assemble. bcc and rest of SMB word |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 167 | area, and byte area if necessary, is converted to littleendian in |
| 168 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | Flags2 is converted in SendReceive */ |
| 170 | |
| 171 | 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] | 172 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | dump_smb(smb_buffer, len); |
| 174 | |
| 175 | while (len > 0) { |
| 176 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); |
| 177 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 178 | i++; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 179 | /* smaller timeout here than send2 since smaller size */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 180 | /* Although it may not be required, this also is smaller |
| 181 | oplock break time */ |
| 182 | if (i > 12) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 184 | ("sends on sock %p stuck for 7 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | ssocket)); |
| 186 | rc = -EAGAIN; |
| 187 | break; |
| 188 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 189 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | continue; |
| 191 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 192 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | break; |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 194 | else |
| 195 | i = 0; /* reset i after each successful send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | iov.iov_base += rc; |
| 197 | iov.iov_len -= rc; |
| 198 | len -= rc; |
| 199 | } |
| 200 | |
| 201 | if (rc < 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 202 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } else { |
| 204 | rc = 0; |
| 205 | } |
| 206 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 207 | /* Don't want to modify the buffer as a |
| 208 | side effect of this call. */ |
| 209 | smb_buffer->smb_buf_length = smb_buf_length; |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return rc; |
| 212 | } |
| 213 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 214 | static int |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 215 | smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec, |
| 216 | struct sockaddr *sin) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | { |
| 218 | int rc = 0; |
| 219 | int i = 0; |
| 220 | struct msghdr smb_msg; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 221 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
| 222 | unsigned int len = iov[0].iov_len; |
| 223 | unsigned int total_len; |
| 224 | int first_vec = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 225 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 226 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 227 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | smb_msg.msg_name = sin; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 231 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | smb_msg.msg_control = NULL; |
| 233 | smb_msg.msg_controllen = 0; |
| 234 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ |
| 235 | |
| 236 | /* smb header is converted in header_assemble. bcc and rest of SMB word |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 237 | area, and byte area if necessary, is converted to littleendian in |
| 238 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | Flags2 is converted in SendReceive */ |
| 240 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 241 | |
| 242 | total_len = 0; |
| 243 | for (i = 0; i < n_vec; i++) |
| 244 | total_len += iov[i].iov_len; |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | 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] | 247 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | dump_smb(smb_buffer, len); |
| 249 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 250 | while (total_len) { |
| 251 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
| 252 | n_vec - first_vec, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 254 | i++; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 255 | if (i >= 14) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 257 | ("sends on sock %p stuck for 15 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | ssocket)); |
| 259 | rc = -EAGAIN; |
| 260 | break; |
| 261 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 262 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | continue; |
| 264 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 265 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 267 | |
| 268 | if (rc >= total_len) { |
| 269 | WARN_ON(rc > total_len); |
| 270 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 271 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 272 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 273 | /* should never happen, letting socket clear before |
| 274 | retrying is our only obvious option here */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 275 | cERROR(1, ("tcp sent no data")); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 276 | msleep(500); |
| 277 | continue; |
| 278 | } |
| 279 | total_len -= rc; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 280 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 281 | for (i = first_vec; i < n_vec; i++) { |
| 282 | if (iov[i].iov_len) { |
| 283 | if (rc > iov[i].iov_len) { |
| 284 | rc -= iov[i].iov_len; |
| 285 | iov[i].iov_len = 0; |
| 286 | } else { |
| 287 | iov[i].iov_base += rc; |
| 288 | iov[i].iov_len -= rc; |
| 289 | first_vec = i; |
| 290 | break; |
| 291 | } |
| 292 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 293 | } |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 294 | i = 0; /* in case we get ENOSPC on the next send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | if (rc < 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 298 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 299 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 302 | /* Don't want to modify the buffer as a |
| 303 | side effect of this call. */ |
| 304 | smb_buffer->smb_buf_length = smb_buf_length; |
| 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | return rc; |
| 307 | } |
| 308 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 309 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
| 310 | { |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 311 | if (long_op == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 312 | /* oplock breaks must not be held up */ |
| 313 | atomic_inc(&ses->server->inFlight); |
| 314 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 315 | spin_lock(&GlobalMid_Lock); |
| 316 | while (1) { |
| 317 | if (atomic_read(&ses->server->inFlight) >= |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 318 | cifs_max_pending){ |
| 319 | spin_unlock(&GlobalMid_Lock); |
| 320 | #ifdef CONFIG_CIFS_STATS2 |
| 321 | atomic_inc(&ses->server->num_waiters); |
| 322 | #endif |
| 323 | wait_event(ses->server->request_q, |
| 324 | atomic_read(&ses->server->inFlight) |
| 325 | < cifs_max_pending); |
| 326 | #ifdef CONFIG_CIFS_STATS2 |
| 327 | atomic_dec(&ses->server->num_waiters); |
| 328 | #endif |
| 329 | spin_lock(&GlobalMid_Lock); |
| 330 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 331 | if (ses->server->tcpStatus == CifsExiting) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 332 | spin_unlock(&GlobalMid_Lock); |
| 333 | return -ENOENT; |
| 334 | } |
| 335 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 336 | /* can not count locking commands against total |
| 337 | as they are allowed to block on server */ |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 338 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 339 | /* update # of requests on the wire to server */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 340 | if (long_op != CIFS_BLOCKING_OP) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 341 | atomic_inc(&ses->server->inFlight); |
| 342 | spin_unlock(&GlobalMid_Lock); |
| 343 | break; |
| 344 | } |
| 345 | } |
| 346 | } |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
| 351 | struct mid_q_entry **ppmidQ) |
| 352 | { |
| 353 | if (ses->server->tcpStatus == CifsExiting) { |
| 354 | return -ENOENT; |
| 355 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 356 | cFYI(1, ("tcp session dead - return to caller to retry")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 357 | return -EAGAIN; |
| 358 | } else if (ses->status != CifsGood) { |
| 359 | /* check if SMB session is bad because we are setting it up */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 360 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 361 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 362 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 363 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 364 | } |
| 365 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 366 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 367 | return -ENOMEM; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 368 | return 0; |
| 369 | } |
| 370 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 371 | static int wait_for_response(struct cifsSesInfo *ses, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 372 | struct mid_q_entry *midQ, |
| 373 | unsigned long timeout, |
| 374 | unsigned long time_to_wait) |
| 375 | { |
| 376 | unsigned long curr_timeout; |
| 377 | |
| 378 | for (;;) { |
| 379 | curr_timeout = timeout + jiffies; |
| 380 | wait_event(ses->server->response_q, |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 381 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
| 382 | time_after(jiffies, curr_timeout) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 383 | ((ses->server->tcpStatus != CifsGood) && |
| 384 | (ses->server->tcpStatus != CifsNew))); |
| 385 | |
| 386 | if (time_after(jiffies, curr_timeout) && |
| 387 | (midQ->midState == MID_REQUEST_SUBMITTED) && |
| 388 | ((ses->server->tcpStatus == CifsGood) || |
| 389 | (ses->server->tcpStatus == CifsNew))) { |
| 390 | |
| 391 | unsigned long lrt; |
| 392 | |
| 393 | /* We timed out. Is the server still |
| 394 | sending replies ? */ |
| 395 | spin_lock(&GlobalMid_Lock); |
| 396 | lrt = ses->server->lstrp; |
| 397 | spin_unlock(&GlobalMid_Lock); |
| 398 | |
| 399 | /* Calculate time_to_wait past last receive time. |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 400 | Although we prefer not to time out if the |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 401 | server is still responding - we will time |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 402 | out if the server takes more than 15 (or 45 |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 403 | or 180) seconds to respond to this request |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 404 | and has not responded to any request from |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 405 | other threads on the client within 10 seconds */ |
| 406 | lrt += time_to_wait; |
| 407 | if (time_after(jiffies, lrt)) { |
| 408 | /* No replies for time_to_wait. */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 409 | cERROR(1, ("server not responding")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 410 | return -1; |
| 411 | } |
| 412 | } else { |
| 413 | return 0; |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 418 | |
| 419 | /* |
| 420 | * |
| 421 | * Send an SMB Request. No response info (other than return code) |
| 422 | * needs to be parsed. |
| 423 | * |
| 424 | * flags indicate the type of request buffer and how long to wait |
| 425 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 426 | * |
| 427 | */ |
| 428 | int |
| 429 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, |
| 430 | struct smb_hdr *in_buf, int flags) |
| 431 | { |
| 432 | int rc; |
| 433 | struct kvec iov[1]; |
| 434 | int resp_buf_type; |
| 435 | |
| 436 | iov[0].iov_base = (char *)in_buf; |
| 437 | iov[0].iov_len = in_buf->smb_buf_length + 4; |
| 438 | flags |= CIFS_NO_RESP; |
| 439 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 440 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
| 441 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 442 | return rc; |
| 443 | } |
| 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | int |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 446 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
| 447 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 448 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | { |
| 450 | int rc = 0; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 451 | int long_op; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 452 | unsigned int receive_len; |
| 453 | unsigned long timeout; |
| 454 | struct mid_q_entry *midQ; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 455 | struct smb_hdr *in_buf = iov[0].iov_base; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 456 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 457 | long_op = flags & CIFS_TIMEOUT_MASK; |
| 458 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 459 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 461 | if ((ses == NULL) || (ses->server == NULL)) { |
| 462 | cifs_small_buf_release(in_buf); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 463 | cERROR(1, ("Null session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | return -EIO; |
| 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 467 | if (ses->server->tcpStatus == CifsExiting) { |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 468 | cifs_small_buf_release(in_buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 469 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 470 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 471 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 472 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | to the same server. We may make this configurable later or |
| 474 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 476 | rc = wait_for_free_request(ses, long_op); |
| 477 | if (rc) { |
| 478 | cifs_small_buf_release(in_buf); |
| 479 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 481 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 482 | /* 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] | 483 | and avoid races inside tcp sendmsg code that could cause corruption |
| 484 | of smb data */ |
| 485 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 486 | down(&ses->server->tcpSem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 488 | rc = allocate_mid(ses, in_buf, &midQ); |
| 489 | if (rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | up(&ses->server->tcpSem); |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 491 | cifs_small_buf_release(in_buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 492 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 493 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 494 | wake_up(&ses->server->request_q); |
| 495 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 497 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 500 | #ifdef CONFIG_CIFS_STATS2 |
| 501 | atomic_inc(&ses->server->inSend); |
| 502 | #endif |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 503 | rc = smb_send2(ses->server->ssocket, iov, n_vec, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 504 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 505 | #ifdef CONFIG_CIFS_STATS2 |
| 506 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 507 | midQ->when_sent = jiffies; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 508 | #endif |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 509 | |
| 510 | up(&ses->server->tcpSem); |
| 511 | cifs_small_buf_release(in_buf); |
| 512 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 513 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 514 | goto out; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 515 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 516 | if (long_op == CIFS_STD_OP) |
| 517 | timeout = 15 * HZ; |
| 518 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 519 | timeout = 180 * HZ; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 520 | else if (long_op == CIFS_LONG_OP) |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 521 | timeout = 45 * HZ; /* should be greater than |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 522 | servers oplock break timeout (about 43 seconds) */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 523 | else if (long_op == CIFS_ASYNC_OP) |
| 524 | goto out; |
| 525 | else if (long_op == CIFS_BLOCKING_OP) |
| 526 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ |
| 527 | else { |
| 528 | cERROR(1, ("unknown timeout flag %d", long_op)); |
| 529 | rc = -EIO; |
| 530 | goto out; |
| 531 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 532 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 533 | /* wait for 15 seconds or until woken up due to response arriving or |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 534 | due to last connection to this server being unmounted */ |
| 535 | if (signal_pending(current)) { |
| 536 | /* if signal pending do not hold up user for full smb timeout |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 537 | but we still give response a chance to complete */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 538 | timeout = 2 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 539 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 540 | |
| 541 | /* No user interrupts in wait - wreaks havoc with performance */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 542 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 543 | |
| 544 | spin_lock(&GlobalMid_Lock); |
| 545 | if (midQ->resp_buf) { |
| 546 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 547 | receive_len = midQ->resp_buf->smb_buf_length; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 548 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 549 | cERROR(1, ("No response to cmd %d mid %d", |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 550 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 551 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 552 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 553 | rc = -EHOSTDOWN; |
| 554 | else { |
| 555 | ses->server->tcpStatus = CifsNeedReconnect; |
| 556 | midQ->midState = MID_RETRY_NEEDED; |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 561 | if (midQ->midState == MID_RETRY_NEEDED) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 562 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 563 | cFYI(1, ("marking request for retry")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 564 | } else { |
| 565 | rc = -EIO; |
| 566 | } |
| 567 | } |
| 568 | spin_unlock(&GlobalMid_Lock); |
| 569 | DeleteMidQEntry(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 570 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 571 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 572 | wake_up(&ses->server->request_q); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 573 | return rc; |
| 574 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 575 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 576 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| 577 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| 578 | receive_len, xid)); |
| 579 | rc = -EIO; |
| 580 | } else { /* rcvd frame is ok */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 581 | if (midQ->resp_buf && |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 582 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 583 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 584 | iov[0].iov_base = (char *)midQ->resp_buf; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 585 | if (midQ->largeBuf) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 586 | *pRespBufType = CIFS_LARGE_BUFFER; |
| 587 | else |
| 588 | *pRespBufType = CIFS_SMALL_BUFFER; |
| 589 | iov[0].iov_len = receive_len + 4; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 590 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 591 | dump_smb(midQ->resp_buf, 80); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 592 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 593 | if ((receive_len > 24) && |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 594 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 595 | SECMODE_SIGN_ENABLED))) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 596 | rc = cifs_verify_signature(midQ->resp_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 597 | &ses->server->mac_signing_key, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 598 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 599 | if (rc) { |
| 600 | cERROR(1, ("Unexpected SMB signature")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 601 | /* BB FIXME add code to kill session */ |
| 602 | } |
| 603 | } |
| 604 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 605 | /* BB special case reconnect tid and uid here? */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 606 | rc = map_smb_to_linux_error(midQ->resp_buf, |
| 607 | flags & CIFS_LOG_ERROR); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 608 | |
| 609 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 610 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 611 | /* do not count RFC1001 header */ + |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 612 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 613 | BCC(midQ->resp_buf) = |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 614 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 615 | if ((flags & CIFS_NO_RESP) == 0) |
| 616 | midQ->resp_buf = NULL; /* mark it so buf will |
| 617 | not be freed by |
| 618 | DeleteMidQEntry */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 619 | } else { |
| 620 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 621 | cFYI(1, ("Bad MID state?")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 622 | } |
| 623 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 624 | |
| 625 | out: |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 626 | DeleteMidQEntry(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 627 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 628 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | return rc; |
| 631 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | int |
| 634 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, |
| 635 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 636 | int *pbytes_returned, const int long_op) |
| 637 | { |
| 638 | int rc = 0; |
| 639 | unsigned int receive_len; |
| 640 | unsigned long timeout; |
| 641 | struct mid_q_entry *midQ; |
| 642 | |
| 643 | if (ses == NULL) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 644 | cERROR(1, ("Null smb session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | return -EIO; |
| 646 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 647 | if (ses->server == NULL) { |
| 648 | cERROR(1, ("Null tcp session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | return -EIO; |
| 650 | } |
| 651 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 652 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 653 | return -ENOENT; |
| 654 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 655 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | to the same server. We may make this configurable later or |
| 657 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 659 | rc = wait_for_free_request(ses, long_op); |
| 660 | if (rc) |
| 661 | return rc; |
| 662 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 663 | /* 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] | 664 | and avoid races inside tcp sendmsg code that could cause corruption |
| 665 | of smb data */ |
| 666 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 667 | down(&ses->server->tcpSem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 669 | rc = allocate_mid(ses, in_buf, &midQ); |
| 670 | if (rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | up(&ses->server->tcpSem); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 672 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 673 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 674 | wake_up(&ses->server->request_q); |
| 675 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
| 678 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 679 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | in_buf->smb_buf_length)); |
| 681 | DeleteMidQEntry(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 682 | up(&ses->server->tcpSem); |
| 683 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 684 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 685 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | return -EIO; |
| 687 | } |
| 688 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 689 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 692 | #ifdef CONFIG_CIFS_STATS2 |
| 693 | atomic_inc(&ses->server->inSend); |
| 694 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| 696 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 697 | #ifdef CONFIG_CIFS_STATS2 |
| 698 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 699 | midQ->when_sent = jiffies; |
Steve French | 131afd0b | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 700 | #endif |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 701 | up(&ses->server->tcpSem); |
| 702 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 703 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 704 | goto out; |
| 705 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 706 | if (long_op == CIFS_STD_OP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | timeout = 15 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 708 | /* wait for 15 seconds or until woken up due to response arriving or |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | due to last connection to this server being unmounted */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 710 | else if (long_op == CIFS_ASYNC_OP) |
| 711 | goto out; |
| 712 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
| 713 | timeout = 180 * HZ; |
| 714 | else if (long_op == CIFS_LONG_OP) |
| 715 | timeout = 45 * HZ; /* should be greater than |
| 716 | servers oplock break timeout (about 43 seconds) */ |
| 717 | else if (long_op == CIFS_BLOCKING_OP) |
| 718 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ |
| 719 | else { |
| 720 | cERROR(1, ("unknown timeout flag %d", long_op)); |
| 721 | rc = -EIO; |
| 722 | goto out; |
| 723 | } |
| 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | if (signal_pending(current)) { |
| 726 | /* if signal pending do not hold up user for full smb timeout |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 727 | but we still give response a chance to complete */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | timeout = 2 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 729 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | /* No user interrupts in wait - wreaks havoc with performance */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 732 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | spin_lock(&GlobalMid_Lock); |
| 735 | if (midQ->resp_buf) { |
| 736 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 737 | receive_len = midQ->resp_buf->smb_buf_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 739 | cERROR(1, ("No response for cmd %d mid %d", |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 740 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 741 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 742 | if (ses->server->tcpStatus == CifsExiting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | rc = -EHOSTDOWN; |
| 744 | else { |
| 745 | ses->server->tcpStatus = CifsNeedReconnect; |
| 746 | midQ->midState = MID_RETRY_NEEDED; |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 751 | if (midQ->midState == MID_RETRY_NEEDED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 753 | cFYI(1, ("marking request for retry")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } else { |
| 755 | rc = -EIO; |
| 756 | } |
| 757 | } |
| 758 | spin_unlock(&GlobalMid_Lock); |
| 759 | DeleteMidQEntry(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 760 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 761 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 762 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | return rc; |
| 764 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 767 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | receive_len, xid)); |
| 769 | rc = -EIO; |
| 770 | } else { /* rcvd frame is ok */ |
| 771 | |
| 772 | if (midQ->resp_buf && out_buf |
| 773 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 774 | out_buf->smb_buf_length = receive_len; |
| 775 | memcpy((char *)out_buf + 4, |
| 776 | (char *)midQ->resp_buf + 4, |
| 777 | receive_len); |
| 778 | |
| 779 | dump_smb(out_buf, 92); |
| 780 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 781 | if ((receive_len > 24) && |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 782 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 783 | SECMODE_SIGN_ENABLED))) { |
| 784 | rc = cifs_verify_signature(out_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 785 | &ses->server->mac_signing_key, |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 786 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 787 | if (rc) { |
| 788 | cERROR(1, ("Unexpected SMB signature")); |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 789 | /* BB FIXME add code to kill session */ |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 790 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | } |
| 792 | |
| 793 | *pbytes_returned = out_buf->smb_buf_length; |
| 794 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 795 | /* BB special case reconnect tid and uid here? */ |
Steve French | a761ac5 | 2007-10-18 21:45:27 +0000 | [diff] [blame] | 796 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 799 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 800 | /* do not count RFC1001 header */ + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
Steve French | 0f2b27c | 2005-11-16 14:25:50 -0800 | [diff] [blame] | 802 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | } else { |
| 804 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 805 | cERROR(1, ("Bad MID state?")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 809 | out: |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 810 | DeleteMidQEntry(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 811 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 812 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 815 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 817 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
| 818 | |
| 819 | static int |
| 820 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, |
| 821 | struct mid_q_entry *midQ) |
| 822 | { |
| 823 | int rc = 0; |
| 824 | struct cifsSesInfo *ses = tcon->ses; |
| 825 | __u16 mid = in_buf->Mid; |
| 826 | |
| 827 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); |
| 828 | in_buf->Mid = mid; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 829 | down(&ses->server->tcpSem); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 830 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| 831 | if (rc) { |
| 832 | up(&ses->server->tcpSem); |
| 833 | return rc; |
| 834 | } |
| 835 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| 836 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | up(&ses->server->tcpSem); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 838 | return rc; |
| 839 | } |
| 840 | |
| 841 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 842 | blocking lock to return. */ |
| 843 | |
| 844 | static int |
| 845 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, |
| 846 | struct smb_hdr *in_buf, |
| 847 | struct smb_hdr *out_buf) |
| 848 | { |
| 849 | int bytes_returned; |
| 850 | struct cifsSesInfo *ses = tcon->ses; |
| 851 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 852 | |
| 853 | /* We just modify the current in_buf to change |
| 854 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 855 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 856 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 857 | |
| 858 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 859 | pSMB->Timeout = 0; |
| 860 | pSMB->hdr.Mid = GetNextMid(ses->server); |
| 861 | |
| 862 | return SendReceive(xid, ses, in_buf, out_buf, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 863 | &bytes_returned, CIFS_STD_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | int |
| 867 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, |
| 868 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 869 | int *pbytes_returned) |
| 870 | { |
| 871 | int rc = 0; |
| 872 | int rstart = 0; |
| 873 | unsigned int receive_len; |
| 874 | struct mid_q_entry *midQ; |
| 875 | struct cifsSesInfo *ses; |
| 876 | |
| 877 | if (tcon == NULL || tcon->ses == NULL) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 878 | cERROR(1, ("Null smb session")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 879 | return -EIO; |
| 880 | } |
| 881 | ses = tcon->ses; |
| 882 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 883 | if (ses->server == NULL) { |
| 884 | cERROR(1, ("Null tcp session")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 885 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } |
| 887 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 888 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 889 | return -ENOENT; |
| 890 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 891 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 892 | to the same server. We may make this configurable later or |
| 893 | use ses->maxReq */ |
| 894 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 895 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 896 | if (rc) |
| 897 | return rc; |
| 898 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 899 | /* 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] | 900 | and avoid races inside tcp sendmsg code that could cause corruption |
| 901 | of smb data */ |
| 902 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 903 | down(&ses->server->tcpSem); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 904 | |
| 905 | rc = allocate_mid(ses, in_buf, &midQ); |
| 906 | if (rc) { |
| 907 | up(&ses->server->tcpSem); |
| 908 | return rc; |
| 909 | } |
| 910 | |
| 911 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| 912 | up(&ses->server->tcpSem); |
| 913 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
| 914 | in_buf->smb_buf_length)); |
| 915 | DeleteMidQEntry(midQ); |
| 916 | return -EIO; |
| 917 | } |
| 918 | |
| 919 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| 920 | |
| 921 | midQ->midState = MID_REQUEST_SUBMITTED; |
| 922 | #ifdef CONFIG_CIFS_STATS2 |
| 923 | atomic_inc(&ses->server->inSend); |
| 924 | #endif |
| 925 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
| 926 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
| 927 | #ifdef CONFIG_CIFS_STATS2 |
| 928 | atomic_dec(&ses->server->inSend); |
| 929 | midQ->when_sent = jiffies; |
| 930 | #endif |
| 931 | up(&ses->server->tcpSem); |
| 932 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 933 | if (rc < 0) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 934 | DeleteMidQEntry(midQ); |
| 935 | return rc; |
| 936 | } |
| 937 | |
| 938 | /* Wait for a reply - allow signals to interrupt. */ |
| 939 | rc = wait_event_interruptible(ses->server->response_q, |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 940 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 941 | ((ses->server->tcpStatus != CifsGood) && |
| 942 | (ses->server->tcpStatus != CifsNew))); |
| 943 | |
| 944 | /* Were we interrupted by a signal ? */ |
| 945 | if ((rc == -ERESTARTSYS) && |
| 946 | (midQ->midState == MID_REQUEST_SUBMITTED) && |
| 947 | ((ses->server->tcpStatus == CifsGood) || |
| 948 | (ses->server->tcpStatus == CifsNew))) { |
| 949 | |
| 950 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 951 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 952 | blocking lock to return. */ |
| 953 | |
| 954 | rc = send_nt_cancel(tcon, in_buf, midQ); |
| 955 | if (rc) { |
| 956 | DeleteMidQEntry(midQ); |
| 957 | return rc; |
| 958 | } |
| 959 | } else { |
| 960 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 961 | to cause the blocking lock to return. */ |
| 962 | |
| 963 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 964 | |
| 965 | /* If we get -ENOLCK back the lock may have |
| 966 | already been removed. Don't exit in this case. */ |
| 967 | if (rc && rc != -ENOLCK) { |
| 968 | DeleteMidQEntry(midQ); |
| 969 | return rc; |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | /* Wait 5 seconds for the response. */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 974 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 975 | /* We got the response - restart system call. */ |
| 976 | rstart = 1; |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | spin_lock(&GlobalMid_Lock); |
| 981 | if (midQ->resp_buf) { |
| 982 | spin_unlock(&GlobalMid_Lock); |
| 983 | receive_len = midQ->resp_buf->smb_buf_length; |
| 984 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 985 | cERROR(1, ("No response for cmd %d mid %d", |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 986 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 987 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 988 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 989 | rc = -EHOSTDOWN; |
| 990 | else { |
| 991 | ses->server->tcpStatus = CifsNeedReconnect; |
| 992 | midQ->midState = MID_RETRY_NEEDED; |
| 993 | } |
| 994 | } |
| 995 | |
| 996 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 997 | if (midQ->midState == MID_RETRY_NEEDED) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 998 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 999 | cFYI(1, ("marking request for retry")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1000 | } else { |
| 1001 | rc = -EIO; |
| 1002 | } |
| 1003 | } |
| 1004 | spin_unlock(&GlobalMid_Lock); |
| 1005 | DeleteMidQEntry(midQ); |
| 1006 | return rc; |
| 1007 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1008 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1009 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| 1010 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| 1011 | receive_len, xid)); |
| 1012 | rc = -EIO; |
| 1013 | } else { /* rcvd frame is ok */ |
| 1014 | |
| 1015 | if (midQ->resp_buf && out_buf |
| 1016 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 1017 | out_buf->smb_buf_length = receive_len; |
| 1018 | memcpy((char *)out_buf + 4, |
| 1019 | (char *)midQ->resp_buf + 4, |
| 1020 | receive_len); |
| 1021 | |
| 1022 | dump_smb(out_buf, 92); |
| 1023 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1024 | if ((receive_len > 24) && |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1025 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 1026 | SECMODE_SIGN_ENABLED))) { |
| 1027 | rc = cifs_verify_signature(out_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 1028 | &ses->server->mac_signing_key, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1029 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1030 | if (rc) { |
| 1031 | cERROR(1, ("Unexpected SMB signature")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1032 | /* BB FIXME add code to kill session */ |
| 1033 | } |
| 1034 | } |
| 1035 | |
| 1036 | *pbytes_returned = out_buf->smb_buf_length; |
| 1037 | |
| 1038 | /* BB special case reconnect tid and uid here? */ |
Steve French | a761ac5 | 2007-10-18 21:45:27 +0000 | [diff] [blame] | 1039 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1040 | |
| 1041 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 1042 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 1043 | /* do not count RFC1001 header */ + |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1044 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| 1045 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| 1046 | } else { |
| 1047 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1048 | cERROR(1, ("Bad MID state?")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1049 | } |
| 1050 | } |
| 1051 | DeleteMidQEntry(midQ); |
| 1052 | if (rstart && rc == -EACCES) |
| 1053 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | return rc; |
| 1055 | } |