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 | 14a441a | 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 * |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | struct mid_q_entry *temp; |
| 43 | |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 44 | if (server == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
| 46 | return NULL; |
| 47 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 48 | |
Pekka Enberg | 232087c | 2008-09-15 13:22:54 +0300 | [diff] [blame] | 49 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (temp == NULL) |
| 51 | return temp; |
| 52 | else { |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 53 | memset(temp, 0, sizeof(struct mid_q_entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | temp->mid = smb_buffer->Mid; /* always LE */ |
| 55 | temp->pid = current->pid; |
| 56 | temp->command = smb_buffer->Command; |
| 57 | cFYI(1, ("For smb_command %d", temp->command)); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
| 59 | /* when mid allocated can be before when sent */ |
| 60 | temp->when_alloc = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | temp->tsk = current; |
| 62 | } |
| 63 | |
| 64 | spin_lock(&GlobalMid_Lock); |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 65 | list_add_tail(&temp->qhead, &server->pending_mid_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | atomic_inc(&midCount); |
| 67 | temp->midState = MID_REQUEST_ALLOCATED; |
| 68 | spin_unlock(&GlobalMid_Lock); |
| 69 | return temp; |
| 70 | } |
| 71 | |
| 72 | static void |
| 73 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
| 74 | { |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 75 | #ifdef CONFIG_CIFS_STATS2 |
| 76 | unsigned long now; |
| 77 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 83 | if (midEntry->largeBuf) |
Steve French | b8643e1 | 2005-04-28 22:41:07 -0700 | [diff] [blame] | 84 | cifs_buf_release(midEntry->resp_buf); |
| 85 | else |
| 86 | cifs_small_buf_release(midEntry->resp_buf); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 87 | #ifdef CONFIG_CIFS_STATS2 |
| 88 | now = jiffies; |
| 89 | /* commands taking longer than one second are indications that |
| 90 | something is wrong, unless it is quite a slow link or server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 91 | if ((now - midEntry->when_alloc) > HZ) { |
| 92 | if ((cifsFYI & CIFS_TIMER) && |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 93 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
| 94 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", |
| 95 | midEntry->command, midEntry->mid); |
| 96 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
| 97 | now - midEntry->when_alloc, |
| 98 | now - midEntry->when_sent, |
| 99 | now - midEntry->when_received); |
| 100 | } |
| 101 | } |
| 102 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | mempool_free(midEntry, cifs_mid_poolp); |
| 104 | } |
| 105 | |
| 106 | struct oplock_q_entry * |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 107 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
| 109 | struct oplock_q_entry *temp; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 110 | if ((pinode == NULL) || (tcon == NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
| 112 | return NULL; |
| 113 | } |
| 114 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 115 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | if (temp == NULL) |
| 117 | return temp; |
| 118 | else { |
| 119 | temp->pinode = pinode; |
| 120 | temp->tcon = tcon; |
| 121 | temp->netfid = fid; |
| 122 | spin_lock(&GlobalMid_Lock); |
| 123 | list_add_tail(&temp->qhead, &GlobalOplock_Q); |
| 124 | spin_unlock(&GlobalMid_Lock); |
| 125 | } |
| 126 | return temp; |
| 127 | |
| 128 | } |
| 129 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 130 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 132 | spin_lock(&GlobalMid_Lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* should we check if list empty first? */ |
| 134 | list_del(&oplockEntry->qhead); |
| 135 | spin_unlock(&GlobalMid_Lock); |
| 136 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); |
| 137 | } |
| 138 | |
Steve French | 5d941ca | 2008-04-15 18:40:48 +0000 | [diff] [blame] | 139 | |
| 140 | void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) |
| 141 | { |
| 142 | struct oplock_q_entry *temp; |
| 143 | |
| 144 | if (tcon == NULL) |
| 145 | return; |
| 146 | |
| 147 | spin_lock(&GlobalMid_Lock); |
| 148 | list_for_each_entry(temp, &GlobalOplock_Q, qhead) { |
| 149 | if ((temp->tcon) && (temp->tcon == tcon)) { |
| 150 | list_del(&temp->qhead); |
| 151 | kmem_cache_free(cifs_oplock_cachep, temp); |
| 152 | } |
| 153 | } |
| 154 | spin_unlock(&GlobalMid_Lock); |
| 155 | } |
| 156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | int |
| 158 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 159 | unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
| 161 | int rc = 0; |
| 162 | int i = 0; |
| 163 | struct msghdr smb_msg; |
| 164 | struct kvec iov; |
| 165 | unsigned len = smb_buf_length + 4; |
| 166 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 167 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
| 169 | iov.iov_base = smb_buffer; |
| 170 | iov.iov_len = len; |
| 171 | |
| 172 | smb_msg.msg_name = sin; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 173 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | smb_msg.msg_control = NULL; |
| 175 | smb_msg.msg_controllen = 0; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 176 | if (noblocksnd) |
| 177 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 178 | else |
| 179 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /* 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] | 182 | area, and byte area if necessary, is converted to littleendian in |
| 183 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | Flags2 is converted in SendReceive */ |
| 185 | |
| 186 | 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] | 187 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | dump_smb(smb_buffer, len); |
| 189 | |
| 190 | while (len > 0) { |
| 191 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); |
| 192 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 193 | i++; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 194 | /* smaller timeout here than send2 since smaller size */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 195 | /* Although it may not be required, this also is smaller |
| 196 | oplock break time */ |
| 197 | if (i > 12) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 199 | ("sends on sock %p stuck for 7 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | ssocket)); |
| 201 | rc = -EAGAIN; |
| 202 | break; |
| 203 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 204 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | continue; |
| 206 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 207 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | break; |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 209 | else |
| 210 | i = 0; /* reset i after each successful send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | iov.iov_base += rc; |
| 212 | iov.iov_len -= rc; |
| 213 | len -= rc; |
| 214 | } |
| 215 | |
| 216 | if (rc < 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 217 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } else { |
| 219 | rc = 0; |
| 220 | } |
| 221 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 222 | /* Don't want to modify the buffer as a |
| 223 | side effect of this call. */ |
| 224 | smb_buffer->smb_buf_length = smb_buf_length; |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | return rc; |
| 227 | } |
| 228 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 229 | static int |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 230 | smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec, |
| 231 | struct sockaddr *sin, bool noblocksnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
| 233 | int rc = 0; |
| 234 | int i = 0; |
| 235 | struct msghdr smb_msg; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 236 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
| 237 | unsigned int len = iov[0].iov_len; |
| 238 | unsigned int total_len; |
| 239 | int first_vec = 0; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 240 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 241 | struct socket *ssocket = server->ssocket; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 242 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 243 | if (ssocket == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | smb_msg.msg_name = sin; |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 247 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | smb_msg.msg_control = NULL; |
| 249 | smb_msg.msg_controllen = 0; |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 250 | if (noblocksnd) |
| 251 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
| 252 | else |
| 253 | smb_msg.msg_flags = MSG_NOSIGNAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | /* 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] | 256 | area, and byte area if necessary, is converted to littleendian in |
| 257 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | Flags2 is converted in SendReceive */ |
| 259 | |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 260 | |
| 261 | total_len = 0; |
| 262 | for (i = 0; i < n_vec; i++) |
| 263 | total_len += iov[i].iov_len; |
| 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | 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] | 266 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | dump_smb(smb_buffer, len); |
| 268 | |
Shirish Pargaonkar | 1768035 | 2008-07-29 21:26:13 +0000 | [diff] [blame] | 269 | i = 0; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 270 | while (total_len) { |
| 271 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
| 272 | n_vec - first_vec, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
| 274 | i++; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 275 | if (i >= 14) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | cERROR(1, |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 277 | ("sends on sock %p stuck for 15 seconds", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | ssocket)); |
| 279 | rc = -EAGAIN; |
| 280 | break; |
| 281 | } |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 282 | msleep(1 << i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | continue; |
| 284 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 285 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | break; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 287 | |
Steve French | 61de800 | 2008-10-30 20:15:22 +0000 | [diff] [blame] | 288 | if (rc == total_len) { |
| 289 | total_len = 0; |
| 290 | break; |
| 291 | } else if (rc > total_len) { |
| 292 | cERROR(1, ("sent %d requested %d", rc, total_len)); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 293 | break; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 294 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 295 | if (rc == 0) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 296 | /* should never happen, letting socket clear before |
| 297 | retrying is our only obvious option here */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 298 | cERROR(1, ("tcp sent no data")); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 299 | msleep(500); |
| 300 | continue; |
| 301 | } |
| 302 | total_len -= rc; |
Steve French | 68058e7 | 2005-10-10 10:34:22 -0700 | [diff] [blame] | 303 | /* the line below resets i */ |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 304 | for (i = first_vec; i < n_vec; i++) { |
| 305 | if (iov[i].iov_len) { |
| 306 | if (rc > iov[i].iov_len) { |
| 307 | rc -= iov[i].iov_len; |
| 308 | iov[i].iov_len = 0; |
| 309 | } else { |
| 310 | iov[i].iov_base += rc; |
| 311 | iov[i].iov_len -= rc; |
| 312 | first_vec = i; |
| 313 | break; |
| 314 | } |
| 315 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 316 | } |
Steve French | 5e1253b | 2005-10-10 14:06:37 -0700 | [diff] [blame] | 317 | i = 0; /* in case we get ENOSPC on the next send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 320 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
| 321 | cFYI(1, ("partial send (%d remaining), terminating session", |
| 322 | total_len)); |
| 323 | /* If we have only sent part of an SMB then the next SMB |
| 324 | could be taken as the remainder of this one. We need |
| 325 | to kill the socket so the server throws away the partial |
| 326 | SMB */ |
| 327 | server->tcpStatus = CifsNeedReconnect; |
| 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (rc < 0) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 331 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 332 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 335 | /* Don't want to modify the buffer as a |
| 336 | side effect of this call. */ |
| 337 | smb_buffer->smb_buf_length = smb_buf_length; |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | return rc; |
| 340 | } |
| 341 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 342 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
| 343 | { |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 344 | if (long_op == CIFS_ASYNC_OP) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 345 | /* oplock breaks must not be held up */ |
| 346 | atomic_inc(&ses->server->inFlight); |
| 347 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 348 | spin_lock(&GlobalMid_Lock); |
| 349 | while (1) { |
| 350 | if (atomic_read(&ses->server->inFlight) >= |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 351 | cifs_max_pending){ |
| 352 | spin_unlock(&GlobalMid_Lock); |
| 353 | #ifdef CONFIG_CIFS_STATS2 |
| 354 | atomic_inc(&ses->server->num_waiters); |
| 355 | #endif |
| 356 | wait_event(ses->server->request_q, |
| 357 | atomic_read(&ses->server->inFlight) |
| 358 | < cifs_max_pending); |
| 359 | #ifdef CONFIG_CIFS_STATS2 |
| 360 | atomic_dec(&ses->server->num_waiters); |
| 361 | #endif |
| 362 | spin_lock(&GlobalMid_Lock); |
| 363 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 364 | if (ses->server->tcpStatus == CifsExiting) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 365 | spin_unlock(&GlobalMid_Lock); |
| 366 | return -ENOENT; |
| 367 | } |
| 368 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 369 | /* can not count locking commands against total |
| 370 | as they are allowed to block on server */ |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 371 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 372 | /* update # of requests on the wire to server */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 373 | if (long_op != CIFS_BLOCKING_OP) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 374 | atomic_inc(&ses->server->inFlight); |
| 375 | spin_unlock(&GlobalMid_Lock); |
| 376 | break; |
| 377 | } |
| 378 | } |
| 379 | } |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
| 384 | struct mid_q_entry **ppmidQ) |
| 385 | { |
| 386 | if (ses->server->tcpStatus == CifsExiting) { |
| 387 | return -ENOENT; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame^] | 388 | } |
| 389 | |
| 390 | if (ses->server->tcpStatus == CifsNeedReconnect) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 391 | cFYI(1, ("tcp session dead - return to caller to retry")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 392 | return -EAGAIN; |
Volker Lendecke | 8fbbd36 | 2008-12-06 13:12:34 +0100 | [diff] [blame^] | 393 | } |
| 394 | |
| 395 | if (ses->status != CifsGood) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 396 | /* check if SMB session is bad because we are setting it up */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 397 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 398 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 399 | return -EAGAIN; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 400 | /* else ok - we are setting up session */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 401 | } |
Jeff Layton | 24b9b06 | 2008-12-01 07:09:34 -0500 | [diff] [blame] | 402 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 403 | if (*ppmidQ == NULL) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 404 | return -ENOMEM; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 405 | return 0; |
| 406 | } |
| 407 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 408 | static int wait_for_response(struct cifsSesInfo *ses, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 409 | struct mid_q_entry *midQ, |
| 410 | unsigned long timeout, |
| 411 | unsigned long time_to_wait) |
| 412 | { |
| 413 | unsigned long curr_timeout; |
| 414 | |
| 415 | for (;;) { |
| 416 | curr_timeout = timeout + jiffies; |
Jeff Layton | 8570552 | 2008-12-05 20:41:21 -0500 | [diff] [blame] | 417 | wait_event_timeout(ses->server->response_q, |
| 418 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 419 | |
| 420 | if (time_after(jiffies, curr_timeout) && |
| 421 | (midQ->midState == MID_REQUEST_SUBMITTED) && |
| 422 | ((ses->server->tcpStatus == CifsGood) || |
| 423 | (ses->server->tcpStatus == CifsNew))) { |
| 424 | |
| 425 | unsigned long lrt; |
| 426 | |
| 427 | /* We timed out. Is the server still |
| 428 | sending replies ? */ |
| 429 | spin_lock(&GlobalMid_Lock); |
| 430 | lrt = ses->server->lstrp; |
| 431 | spin_unlock(&GlobalMid_Lock); |
| 432 | |
| 433 | /* Calculate time_to_wait past last receive time. |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 434 | Although we prefer not to time out if the |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 435 | server is still responding - we will time |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 436 | out if the server takes more than 15 (or 45 |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 437 | or 180) seconds to respond to this request |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 438 | and has not responded to any request from |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 439 | other threads on the client within 10 seconds */ |
| 440 | lrt += time_to_wait; |
| 441 | if (time_after(jiffies, lrt)) { |
| 442 | /* No replies for time_to_wait. */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 443 | cERROR(1, ("server not responding")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 444 | return -1; |
| 445 | } |
| 446 | } else { |
| 447 | return 0; |
| 448 | } |
| 449 | } |
| 450 | } |
| 451 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 452 | |
| 453 | /* |
| 454 | * |
| 455 | * Send an SMB Request. No response info (other than return code) |
| 456 | * needs to be parsed. |
| 457 | * |
| 458 | * flags indicate the type of request buffer and how long to wait |
| 459 | * and whether to log NT STATUS code (error) before mapping it to POSIX error |
| 460 | * |
| 461 | */ |
| 462 | int |
| 463 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, |
| 464 | struct smb_hdr *in_buf, int flags) |
| 465 | { |
| 466 | int rc; |
| 467 | struct kvec iov[1]; |
| 468 | int resp_buf_type; |
| 469 | |
| 470 | iov[0].iov_base = (char *)in_buf; |
| 471 | iov[0].iov_len = in_buf->smb_buf_length + 4; |
| 472 | flags |= CIFS_NO_RESP; |
| 473 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 474 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
| 475 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 476 | return rc; |
| 477 | } |
| 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | int |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 480 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
| 481 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 482 | const int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | { |
| 484 | int rc = 0; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 485 | int long_op; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 486 | unsigned int receive_len; |
| 487 | unsigned long timeout; |
| 488 | struct mid_q_entry *midQ; |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 489 | struct smb_hdr *in_buf = iov[0].iov_base; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 490 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 491 | long_op = flags & CIFS_TIMEOUT_MASK; |
| 492 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 493 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 495 | if ((ses == NULL) || (ses->server == NULL)) { |
| 496 | cifs_small_buf_release(in_buf); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 497 | cERROR(1, ("Null session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | return -EIO; |
| 499 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 501 | if (ses->server->tcpStatus == CifsExiting) { |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 502 | cifs_small_buf_release(in_buf); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 503 | return -ENOENT; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 504 | } |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 505 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 506 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | to the same server. We may make this configurable later or |
| 508 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 510 | rc = wait_for_free_request(ses, long_op); |
| 511 | if (rc) { |
| 512 | cifs_small_buf_release(in_buf); |
| 513 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 515 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 516 | /* 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] | 517 | and avoid races inside tcp sendmsg code that could cause corruption |
| 518 | of smb data */ |
| 519 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 520 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 522 | rc = allocate_mid(ses, in_buf, &midQ); |
| 523 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 524 | mutex_unlock(&ses->server->srv_mutex); |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 525 | cifs_small_buf_release(in_buf); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 526 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 527 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 528 | wake_up(&ses->server->request_q); |
| 529 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 531 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 534 | #ifdef CONFIG_CIFS_STATS2 |
| 535 | atomic_inc(&ses->server->inSend); |
| 536 | #endif |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 537 | rc = smb_send2(ses->server, iov, n_vec, |
| 538 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
| 539 | ses->server->noblocksnd); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 540 | #ifdef CONFIG_CIFS_STATS2 |
| 541 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 542 | midQ->when_sent = jiffies; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 543 | #endif |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 544 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 545 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 546 | cifs_small_buf_release(in_buf); |
| 547 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 548 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 549 | goto out; |
Steve French | 4b8f930 | 2006-02-26 16:41:18 +0000 | [diff] [blame] | 550 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 551 | if (long_op == CIFS_STD_OP) |
| 552 | timeout = 15 * HZ; |
| 553 | 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] | 554 | timeout = 180 * HZ; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 555 | else if (long_op == CIFS_LONG_OP) |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 556 | timeout = 45 * HZ; /* should be greater than |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 557 | servers oplock break timeout (about 43 seconds) */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 558 | else if (long_op == CIFS_ASYNC_OP) |
| 559 | goto out; |
| 560 | else if (long_op == CIFS_BLOCKING_OP) |
| 561 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ |
| 562 | else { |
| 563 | cERROR(1, ("unknown timeout flag %d", long_op)); |
| 564 | rc = -EIO; |
| 565 | goto out; |
| 566 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 567 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 568 | /* 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] | 569 | due to last connection to this server being unmounted */ |
| 570 | if (signal_pending(current)) { |
| 571 | /* if signal pending do not hold up user for full smb timeout |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 572 | but we still give response a chance to complete */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 573 | timeout = 2 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 574 | } |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 575 | |
| 576 | /* No user interrupts in wait - wreaks havoc with performance */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 577 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 578 | |
| 579 | spin_lock(&GlobalMid_Lock); |
| 580 | if (midQ->resp_buf) { |
| 581 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 582 | receive_len = midQ->resp_buf->smb_buf_length; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 583 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 584 | cERROR(1, ("No response to cmd %d mid %d", |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 585 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 586 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 587 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 588 | rc = -EHOSTDOWN; |
| 589 | else { |
| 590 | ses->server->tcpStatus = CifsNeedReconnect; |
| 591 | midQ->midState = MID_RETRY_NEEDED; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 596 | if (midQ->midState == MID_RETRY_NEEDED) { |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 597 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 598 | cFYI(1, ("marking request for retry")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 599 | } else { |
| 600 | rc = -EIO; |
| 601 | } |
| 602 | } |
| 603 | spin_unlock(&GlobalMid_Lock); |
| 604 | DeleteMidQEntry(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 605 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 606 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 607 | wake_up(&ses->server->request_q); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 608 | return rc; |
| 609 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 610 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 611 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| 612 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| 613 | receive_len, xid)); |
| 614 | rc = -EIO; |
| 615 | } else { /* rcvd frame is ok */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 616 | if (midQ->resp_buf && |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 617 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 618 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 619 | iov[0].iov_base = (char *)midQ->resp_buf; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 620 | if (midQ->largeBuf) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 621 | *pRespBufType = CIFS_LARGE_BUFFER; |
| 622 | else |
| 623 | *pRespBufType = CIFS_SMALL_BUFFER; |
| 624 | iov[0].iov_len = receive_len + 4; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 625 | |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 626 | dump_smb(midQ->resp_buf, 80); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 627 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 628 | if ((receive_len > 24) && |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 629 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 630 | SECMODE_SIGN_ENABLED))) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 631 | rc = cifs_verify_signature(midQ->resp_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 632 | &ses->server->mac_signing_key, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 633 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 634 | if (rc) { |
| 635 | cERROR(1, ("Unexpected SMB signature")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 636 | /* BB FIXME add code to kill session */ |
| 637 | } |
| 638 | } |
| 639 | |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 640 | /* BB special case reconnect tid and uid here? */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 641 | rc = map_smb_to_linux_error(midQ->resp_buf, |
| 642 | flags & CIFS_LOG_ERROR); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 643 | |
| 644 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 645 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 646 | /* do not count RFC1001 header */ + |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 647 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 648 | BCC(midQ->resp_buf) = |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 649 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 650 | if ((flags & CIFS_NO_RESP) == 0) |
| 651 | midQ->resp_buf = NULL; /* mark it so buf will |
| 652 | not be freed by |
| 653 | DeleteMidQEntry */ |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 654 | } else { |
| 655 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 656 | cFYI(1, ("Bad MID state?")); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 657 | } |
| 658 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 659 | |
| 660 | out: |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 661 | DeleteMidQEntry(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 662 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 663 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | return rc; |
| 666 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | int |
| 669 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, |
| 670 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 671 | int *pbytes_returned, const int long_op) |
| 672 | { |
| 673 | int rc = 0; |
| 674 | unsigned int receive_len; |
| 675 | unsigned long timeout; |
| 676 | struct mid_q_entry *midQ; |
| 677 | |
| 678 | if (ses == NULL) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 679 | cERROR(1, ("Null smb session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | return -EIO; |
| 681 | } |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 682 | if (ses->server == NULL) { |
| 683 | cERROR(1, ("Null tcp session")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return -EIO; |
| 685 | } |
| 686 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 687 | if (ses->server->tcpStatus == CifsExiting) |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 688 | return -ENOENT; |
| 689 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 690 | /* Ensure that we do not send more than 50 overlapping requests |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | to the same server. We may make this configurable later or |
| 692 | use ses->maxReq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 694 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| 695 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
| 696 | in_buf->smb_buf_length)); |
| 697 | return -EIO; |
| 698 | } |
| 699 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 700 | rc = wait_for_free_request(ses, long_op); |
| 701 | if (rc) |
| 702 | return rc; |
| 703 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 704 | /* 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] | 705 | and avoid races inside tcp sendmsg code that could cause corruption |
| 706 | of smb data */ |
| 707 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 708 | mutex_lock(&ses->server->srv_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 710 | rc = allocate_mid(ses, in_buf, &midQ); |
| 711 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 712 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 713 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 714 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 715 | wake_up(&ses->server->request_q); |
| 716 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 719 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
| 721 | midQ->midState = MID_REQUEST_SUBMITTED; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 722 | #ifdef CONFIG_CIFS_STATS2 |
| 723 | atomic_inc(&ses->server->inSend); |
| 724 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 726 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
| 727 | ses->server->noblocksnd); |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 728 | #ifdef CONFIG_CIFS_STATS2 |
| 729 | atomic_dec(&ses->server->inSend); |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 730 | midQ->when_sent = jiffies; |
Steve French | 131afd0 | 2005-10-07 09:51:05 -0700 | [diff] [blame] | 731 | #endif |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 732 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 733 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 734 | if (rc < 0) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 735 | goto out; |
| 736 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 737 | if (long_op == CIFS_STD_OP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | timeout = 15 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 739 | /* 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] | 740 | due to last connection to this server being unmounted */ |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 741 | else if (long_op == CIFS_ASYNC_OP) |
| 742 | goto out; |
| 743 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
| 744 | timeout = 180 * HZ; |
| 745 | else if (long_op == CIFS_LONG_OP) |
| 746 | timeout = 45 * HZ; /* should be greater than |
| 747 | servers oplock break timeout (about 43 seconds) */ |
| 748 | else if (long_op == CIFS_BLOCKING_OP) |
| 749 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ |
| 750 | else { |
| 751 | cERROR(1, ("unknown timeout flag %d", long_op)); |
| 752 | rc = -EIO; |
| 753 | goto out; |
| 754 | } |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | if (signal_pending(current)) { |
| 757 | /* if signal pending do not hold up user for full smb timeout |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 758 | but we still give response a chance to complete */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | timeout = 2 * HZ; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 760 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
| 762 | /* No user interrupts in wait - wreaks havoc with performance */ |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 763 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | spin_lock(&GlobalMid_Lock); |
| 766 | if (midQ->resp_buf) { |
| 767 | spin_unlock(&GlobalMid_Lock); |
Steve French | 70ca734 | 2005-09-22 16:32:06 -0700 | [diff] [blame] | 768 | receive_len = midQ->resp_buf->smb_buf_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 770 | cERROR(1, ("No response for cmd %d mid %d", |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 771 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 772 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 773 | if (ses->server->tcpStatus == CifsExiting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | rc = -EHOSTDOWN; |
| 775 | else { |
| 776 | ses->server->tcpStatus = CifsNeedReconnect; |
| 777 | midQ->midState = MID_RETRY_NEEDED; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 782 | if (midQ->midState == MID_RETRY_NEEDED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 784 | cFYI(1, ("marking request for retry")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } else { |
| 786 | rc = -EIO; |
| 787 | } |
| 788 | } |
| 789 | spin_unlock(&GlobalMid_Lock); |
| 790 | DeleteMidQEntry(midQ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 791 | /* Update # of requests on wire to server */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 792 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 793 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | return rc; |
| 795 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 796 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 798 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | receive_len, xid)); |
| 800 | rc = -EIO; |
| 801 | } else { /* rcvd frame is ok */ |
| 802 | |
| 803 | if (midQ->resp_buf && out_buf |
| 804 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 805 | out_buf->smb_buf_length = receive_len; |
| 806 | memcpy((char *)out_buf + 4, |
| 807 | (char *)midQ->resp_buf + 4, |
| 808 | receive_len); |
| 809 | |
| 810 | dump_smb(out_buf, 92); |
| 811 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 812 | if ((receive_len > 24) && |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 813 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 814 | SECMODE_SIGN_ENABLED))) { |
| 815 | rc = cifs_verify_signature(out_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 816 | &ses->server->mac_signing_key, |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 817 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 818 | if (rc) { |
| 819 | cERROR(1, ("Unexpected SMB signature")); |
Steve French | 275cde1 | 2005-04-28 22:41:10 -0700 | [diff] [blame] | 820 | /* BB FIXME add code to kill session */ |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 821 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | *pbytes_returned = out_buf->smb_buf_length; |
| 825 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 826 | /* BB special case reconnect tid and uid here? */ |
Steve French | a761ac5 | 2007-10-18 21:45:27 +0000 | [diff] [blame] | 827 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
| 829 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 830 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 831 | /* do not count RFC1001 header */ + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
Steve French | 0f2b27c | 2005-11-16 14:25:50 -0800 | [diff] [blame] | 833 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } else { |
| 835 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 836 | cERROR(1, ("Bad MID state?")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 840 | out: |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 841 | DeleteMidQEntry(midQ); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 842 | atomic_dec(&ses->server->inFlight); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 843 | wake_up(&ses->server->request_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | return rc; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 846 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 848 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
| 849 | |
| 850 | static int |
| 851 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, |
| 852 | struct mid_q_entry *midQ) |
| 853 | { |
| 854 | int rc = 0; |
| 855 | struct cifsSesInfo *ses = tcon->ses; |
| 856 | __u16 mid = in_buf->Mid; |
| 857 | |
| 858 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); |
| 859 | in_buf->Mid = mid; |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 860 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 861 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| 862 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 863 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 864 | return rc; |
| 865 | } |
| 866 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 867 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
| 868 | ses->server->noblocksnd); |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 869 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 870 | return rc; |
| 871 | } |
| 872 | |
| 873 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
| 874 | blocking lock to return. */ |
| 875 | |
| 876 | static int |
| 877 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, |
| 878 | struct smb_hdr *in_buf, |
| 879 | struct smb_hdr *out_buf) |
| 880 | { |
| 881 | int bytes_returned; |
| 882 | struct cifsSesInfo *ses = tcon->ses; |
| 883 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
| 884 | |
| 885 | /* We just modify the current in_buf to change |
| 886 | the type of lock from LOCKING_ANDX_SHARED_LOCK |
| 887 | or LOCKING_ANDX_EXCLUSIVE_LOCK to |
| 888 | LOCKING_ANDX_CANCEL_LOCK. */ |
| 889 | |
| 890 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; |
| 891 | pSMB->Timeout = 0; |
| 892 | pSMB->hdr.Mid = GetNextMid(ses->server); |
| 893 | |
| 894 | return SendReceive(xid, ses, in_buf, out_buf, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 895 | &bytes_returned, CIFS_STD_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | int |
| 899 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, |
| 900 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
| 901 | int *pbytes_returned) |
| 902 | { |
| 903 | int rc = 0; |
| 904 | int rstart = 0; |
| 905 | unsigned int receive_len; |
| 906 | struct mid_q_entry *midQ; |
| 907 | struct cifsSesInfo *ses; |
| 908 | |
| 909 | if (tcon == NULL || tcon->ses == NULL) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 910 | cERROR(1, ("Null smb session")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 911 | return -EIO; |
| 912 | } |
| 913 | ses = tcon->ses; |
| 914 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 915 | if (ses->server == NULL) { |
| 916 | cERROR(1, ("Null tcp session")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 917 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 920 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 921 | return -ENOENT; |
| 922 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 923 | /* Ensure that we do not send more than 50 overlapping requests |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 924 | to the same server. We may make this configurable later or |
| 925 | use ses->maxReq */ |
| 926 | |
Volker Lendecke | 6d9c6d5 | 2008-12-08 20:50:24 +0000 | [diff] [blame] | 927 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
| 928 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
| 929 | in_buf->smb_buf_length)); |
| 930 | return -EIO; |
| 931 | } |
| 932 | |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 933 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 934 | if (rc) |
| 935 | return rc; |
| 936 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 937 | /* 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] | 938 | and avoid races inside tcp sendmsg code that could cause corruption |
| 939 | of smb data */ |
| 940 | |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 941 | mutex_lock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 942 | |
| 943 | rc = allocate_mid(ses, in_buf, &midQ); |
| 944 | if (rc) { |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 945 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 946 | return rc; |
| 947 | } |
| 948 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 949 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
| 950 | |
| 951 | midQ->midState = MID_REQUEST_SUBMITTED; |
| 952 | #ifdef CONFIG_CIFS_STATS2 |
| 953 | atomic_inc(&ses->server->inSend); |
| 954 | #endif |
| 955 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
Steve French | edf1ae4 | 2008-10-29 00:47:57 +0000 | [diff] [blame] | 956 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
| 957 | ses->server->noblocksnd); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 958 | #ifdef CONFIG_CIFS_STATS2 |
| 959 | atomic_dec(&ses->server->inSend); |
| 960 | midQ->when_sent = jiffies; |
| 961 | #endif |
Jeff Layton | 72ca545 | 2008-12-01 07:09:36 -0500 | [diff] [blame] | 962 | mutex_unlock(&ses->server->srv_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 963 | |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 964 | if (rc < 0) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 965 | DeleteMidQEntry(midQ); |
| 966 | return rc; |
| 967 | } |
| 968 | |
| 969 | /* Wait for a reply - allow signals to interrupt. */ |
| 970 | rc = wait_event_interruptible(ses->server->response_q, |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 971 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 972 | ((ses->server->tcpStatus != CifsGood) && |
| 973 | (ses->server->tcpStatus != CifsNew))); |
| 974 | |
| 975 | /* Were we interrupted by a signal ? */ |
| 976 | if ((rc == -ERESTARTSYS) && |
| 977 | (midQ->midState == MID_REQUEST_SUBMITTED) && |
| 978 | ((ses->server->tcpStatus == CifsGood) || |
| 979 | (ses->server->tcpStatus == CifsNew))) { |
| 980 | |
| 981 | if (in_buf->Command == SMB_COM_TRANSACTION2) { |
| 982 | /* POSIX lock. We send a NT_CANCEL SMB to cause the |
| 983 | blocking lock to return. */ |
| 984 | |
| 985 | rc = send_nt_cancel(tcon, in_buf, midQ); |
| 986 | if (rc) { |
| 987 | DeleteMidQEntry(midQ); |
| 988 | return rc; |
| 989 | } |
| 990 | } else { |
| 991 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK |
| 992 | to cause the blocking lock to return. */ |
| 993 | |
| 994 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); |
| 995 | |
| 996 | /* If we get -ENOLCK back the lock may have |
| 997 | already been removed. Don't exit in this case. */ |
| 998 | if (rc && rc != -ENOLCK) { |
| 999 | DeleteMidQEntry(midQ); |
| 1000 | return rc; |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | /* Wait 5 seconds for the response. */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1005 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1006 | /* We got the response - restart system call. */ |
| 1007 | rstart = 1; |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | spin_lock(&GlobalMid_Lock); |
| 1012 | if (midQ->resp_buf) { |
| 1013 | spin_unlock(&GlobalMid_Lock); |
| 1014 | receive_len = midQ->resp_buf->smb_buf_length; |
| 1015 | } else { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1016 | cERROR(1, ("No response for cmd %d mid %d", |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1017 | midQ->command, midQ->mid)); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1018 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
| 1019 | if (ses->server->tcpStatus == CifsExiting) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1020 | rc = -EHOSTDOWN; |
| 1021 | else { |
| 1022 | ses->server->tcpStatus = CifsNeedReconnect; |
| 1023 | midQ->midState = MID_RETRY_NEEDED; |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | if (rc != -EHOSTDOWN) { |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1028 | if (midQ->midState == MID_RETRY_NEEDED) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1029 | rc = -EAGAIN; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1030 | cFYI(1, ("marking request for retry")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1031 | } else { |
| 1032 | rc = -EIO; |
| 1033 | } |
| 1034 | } |
| 1035 | spin_unlock(&GlobalMid_Lock); |
| 1036 | DeleteMidQEntry(midQ); |
| 1037 | return rc; |
| 1038 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1039 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1040 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
| 1041 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
| 1042 | receive_len, xid)); |
| 1043 | rc = -EIO; |
| 1044 | } else { /* rcvd frame is ok */ |
| 1045 | |
| 1046 | if (midQ->resp_buf && out_buf |
| 1047 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { |
| 1048 | out_buf->smb_buf_length = receive_len; |
| 1049 | memcpy((char *)out_buf + 4, |
| 1050 | (char *)midQ->resp_buf + 4, |
| 1051 | receive_len); |
| 1052 | |
| 1053 | dump_smb(out_buf, 92); |
| 1054 | /* convert the length into a more usable form */ |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1055 | if ((receive_len > 24) && |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1056 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
| 1057 | SECMODE_SIGN_ENABLED))) { |
| 1058 | rc = cifs_verify_signature(out_buf, |
Steve French | b609f06 | 2007-07-09 07:55:14 +0000 | [diff] [blame] | 1059 | &ses->server->mac_signing_key, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1060 | midQ->sequence_number+1); |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1061 | if (rc) { |
| 1062 | cERROR(1, ("Unexpected SMB signature")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1063 | /* BB FIXME add code to kill session */ |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | *pbytes_returned = out_buf->smb_buf_length; |
| 1068 | |
| 1069 | /* BB special case reconnect tid and uid here? */ |
Steve French | a761ac5 | 2007-10-18 21:45:27 +0000 | [diff] [blame] | 1070 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1071 | |
| 1072 | /* convert ByteCount if necessary */ |
Steve French | 26f5736 | 2007-08-30 22:09:15 +0000 | [diff] [blame] | 1073 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
| 1074 | /* do not count RFC1001 header */ + |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1075 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
| 1076 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
| 1077 | } else { |
| 1078 | rc = -EIO; |
Steve French | 79a58d1 | 2007-07-06 22:44:50 +0000 | [diff] [blame] | 1079 | cERROR(1, ("Bad MID state?")); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 1080 | } |
| 1081 | } |
| 1082 | DeleteMidQEntry(midQ); |
| 1083 | if (rstart && rc == -EACCES) |
| 1084 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | return rc; |
| 1086 | } |