ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1 | /* |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 2 | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
| 3 | * |
| 4 | * Network Block Device |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; under version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
Blue Swirl | 8167ee8 | 2009-07-16 20:47:01 +0000 | [diff] [blame] | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 17 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 18 | |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 19 | #include "block/nbd.h" |
| 20 | #include "block/block.h" |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 21 | |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 22 | #include "block/coroutine.h" |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 23 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 24 | #include <errno.h> |
| 25 | #include <string.h> |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 26 | #ifndef _WIN32 |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 27 | #include <sys/ioctl.h> |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 28 | #endif |
Andreas Färber | 5dc2eec | 2010-09-20 00:50:46 +0200 | [diff] [blame] | 29 | #if defined(__sun__) || defined(__HAIKU__) |
aliguori | 7e00eb9 | 2008-08-02 01:57:02 +0000 | [diff] [blame] | 30 | #include <sys/ioccom.h> |
| 31 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 32 | #include <ctype.h> |
| 33 | #include <inttypes.h> |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 34 | |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 35 | #ifdef __linux__ |
| 36 | #include <linux/fs.h> |
| 37 | #endif |
| 38 | |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 39 | #include "qemu/sockets.h" |
| 40 | #include "qemu/queue.h" |
Alex Bligh | 6a1751b | 2013-08-21 16:02:47 +0100 | [diff] [blame] | 41 | #include "qemu/main-loop.h" |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 42 | |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 43 | //#define DEBUG_NBD |
| 44 | |
| 45 | #ifdef DEBUG_NBD |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 46 | #define TRACE(msg, ...) do { \ |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 47 | LOG(msg, ## __VA_ARGS__); \ |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 48 | } while(0) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 49 | #else |
| 50 | #define TRACE(msg, ...) \ |
| 51 | do { } while (0) |
| 52 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 53 | |
| 54 | #define LOG(msg, ...) do { \ |
| 55 | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
| 56 | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
| 57 | } while(0) |
| 58 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 59 | /* This is all part of the "official" NBD API */ |
| 60 | |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 61 | #define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 62 | #define NBD_REPLY_SIZE (4 + 4 + 8) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 63 | #define NBD_REQUEST_MAGIC 0x25609513 |
| 64 | #define NBD_REPLY_MAGIC 0x67446698 |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 65 | #define NBD_OPTS_MAGIC 0x49484156454F5054LL |
| 66 | #define NBD_CLIENT_MAGIC 0x0000420281861253LL |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 67 | |
| 68 | #define NBD_SET_SOCK _IO(0xab, 0) |
| 69 | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
| 70 | #define NBD_SET_SIZE _IO(0xab, 2) |
| 71 | #define NBD_DO_IT _IO(0xab, 3) |
| 72 | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
| 73 | #define NBD_CLEAR_QUE _IO(0xab, 5) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 74 | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
| 75 | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 76 | #define NBD_DISCONNECT _IO(0xab, 8) |
Paolo Bonzini | bbb74ed | 2011-09-08 17:24:55 +0200 | [diff] [blame] | 77 | #define NBD_SET_TIMEOUT _IO(0xab, 9) |
| 78 | #define NBD_SET_FLAGS _IO(0xab, 10) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 79 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 80 | #define NBD_OPT_EXPORT_NAME (1 << 0) |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 81 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 82 | /* Definitions for opaque data types */ |
| 83 | |
| 84 | typedef struct NBDRequest NBDRequest; |
| 85 | |
| 86 | struct NBDRequest { |
| 87 | QSIMPLEQ_ENTRY(NBDRequest) entry; |
| 88 | NBDClient *client; |
| 89 | uint8_t *data; |
| 90 | }; |
| 91 | |
| 92 | struct NBDExport { |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 93 | int refcount; |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 94 | void (*close)(NBDExport *exp); |
| 95 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 96 | BlockDriverState *bs; |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 97 | char *name; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 98 | off_t dev_offset; |
| 99 | off_t size; |
| 100 | uint32_t nbdflags; |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 101 | QTAILQ_HEAD(, NBDClient) clients; |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 102 | QTAILQ_ENTRY(NBDExport) next; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 103 | }; |
| 104 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 105 | static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); |
| 106 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 107 | struct NBDClient { |
| 108 | int refcount; |
| 109 | void (*close)(NBDClient *client); |
| 110 | |
| 111 | NBDExport *exp; |
| 112 | int sock; |
| 113 | |
| 114 | Coroutine *recv_coroutine; |
| 115 | |
| 116 | CoMutex send_lock; |
| 117 | Coroutine *send_coroutine; |
| 118 | |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 119 | QTAILQ_ENTRY(NBDClient) next; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 120 | int nb_requests; |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 121 | bool closing; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 122 | }; |
| 123 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 124 | /* That's all folks */ |
| 125 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 126 | ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 127 | { |
| 128 | size_t offset = 0; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 129 | int err; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 130 | |
Paolo Bonzini | ae255e5 | 2011-09-08 14:28:59 +0200 | [diff] [blame] | 131 | if (qemu_in_coroutine()) { |
| 132 | if (do_read) { |
| 133 | return qemu_co_recv(fd, buffer, size); |
| 134 | } else { |
| 135 | return qemu_co_send(fd, buffer, size); |
| 136 | } |
| 137 | } |
| 138 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 139 | while (offset < size) { |
| 140 | ssize_t len; |
| 141 | |
| 142 | if (do_read) { |
Blue Swirl | 00aa004 | 2011-07-23 20:04:29 +0000 | [diff] [blame] | 143 | len = qemu_recv(fd, buffer + offset, size - offset, 0); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 144 | } else { |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 145 | len = send(fd, buffer + offset, size - offset, 0); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 146 | } |
| 147 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 148 | if (len < 0) { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 149 | err = socket_error(); |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 150 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 151 | /* recoverable error */ |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 152 | if (err == EINTR || (offset > 0 && err == EAGAIN)) { |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 153 | continue; |
| 154 | } |
| 155 | |
| 156 | /* unrecoverable error */ |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 157 | return -err; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | /* eof */ |
| 161 | if (len == 0) { |
| 162 | break; |
| 163 | } |
| 164 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 165 | offset += len; |
| 166 | } |
| 167 | |
| 168 | return offset; |
| 169 | } |
| 170 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 171 | static ssize_t read_sync(int fd, void *buffer, size_t size) |
| 172 | { |
| 173 | /* Sockets are kept in blocking mode in the negotiation phase. After |
| 174 | * that, a non-readable socket simply means that another thread stole |
| 175 | * our request/reply. Synchronization is done with recv_coroutine, so |
| 176 | * that this is coroutine-safe. |
| 177 | */ |
| 178 | return nbd_wr_sync(fd, buffer, size, true); |
| 179 | } |
| 180 | |
| 181 | static ssize_t write_sync(int fd, void *buffer, size_t size) |
| 182 | { |
| 183 | int ret; |
| 184 | do { |
| 185 | /* For writes, we do expect the socket to be writable. */ |
| 186 | ret = nbd_wr_sync(fd, buffer, size, false); |
| 187 | } while (ret == -EAGAIN); |
| 188 | return ret; |
| 189 | } |
| 190 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 191 | /* Basic flow for negotiation |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 192 | |
| 193 | Server Client |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 194 | Negotiate |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 195 | |
| 196 | or |
| 197 | |
| 198 | Server Client |
| 199 | Negotiate #1 |
| 200 | Option |
| 201 | Negotiate #2 |
| 202 | |
| 203 | ---- |
| 204 | |
| 205 | followed by |
| 206 | |
| 207 | Server Client |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 208 | Request |
| 209 | Response |
| 210 | Request |
| 211 | Response |
| 212 | ... |
| 213 | ... |
| 214 | Request (type == 2) |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 215 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 216 | */ |
| 217 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 218 | static int nbd_receive_options(NBDClient *client) |
| 219 | { |
| 220 | int csock = client->sock; |
| 221 | char name[256]; |
| 222 | uint32_t tmp, length; |
| 223 | uint64_t magic; |
| 224 | int rc; |
| 225 | |
| 226 | /* Client sends: |
| 227 | [ 0 .. 3] reserved (0) |
| 228 | [ 4 .. 11] NBD_OPTS_MAGIC |
| 229 | [12 .. 15] NBD_OPT_EXPORT_NAME |
| 230 | [16 .. 19] length |
| 231 | [20 .. xx] export name (length bytes) |
| 232 | */ |
| 233 | |
| 234 | rc = -EINVAL; |
| 235 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
| 236 | LOG("read failed"); |
| 237 | goto fail; |
| 238 | } |
| 239 | TRACE("Checking reserved"); |
| 240 | if (tmp != 0) { |
| 241 | LOG("Bad reserved received"); |
| 242 | goto fail; |
| 243 | } |
| 244 | |
| 245 | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 246 | LOG("read failed"); |
| 247 | goto fail; |
| 248 | } |
| 249 | TRACE("Checking reserved"); |
| 250 | if (magic != be64_to_cpu(NBD_OPTS_MAGIC)) { |
| 251 | LOG("Bad magic received"); |
| 252 | goto fail; |
| 253 | } |
| 254 | |
| 255 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
| 256 | LOG("read failed"); |
| 257 | goto fail; |
| 258 | } |
| 259 | TRACE("Checking option"); |
| 260 | if (tmp != be32_to_cpu(NBD_OPT_EXPORT_NAME)) { |
| 261 | LOG("Bad option received"); |
| 262 | goto fail; |
| 263 | } |
| 264 | |
| 265 | if (read_sync(csock, &length, sizeof(length)) != sizeof(length)) { |
| 266 | LOG("read failed"); |
| 267 | goto fail; |
| 268 | } |
| 269 | TRACE("Checking length"); |
| 270 | length = be32_to_cpu(length); |
| 271 | if (length > 255) { |
| 272 | LOG("Bad length received"); |
| 273 | goto fail; |
| 274 | } |
| 275 | if (read_sync(csock, name, length) != length) { |
| 276 | LOG("read failed"); |
| 277 | goto fail; |
| 278 | } |
| 279 | name[length] = '\0'; |
| 280 | |
| 281 | client->exp = nbd_export_find(name); |
| 282 | if (!client->exp) { |
| 283 | LOG("export not found"); |
| 284 | goto fail; |
| 285 | } |
| 286 | |
| 287 | QTAILQ_INSERT_TAIL(&client->exp->clients, client, next); |
| 288 | nbd_export_get(client->exp); |
| 289 | |
| 290 | TRACE("Option negotiation succeeded."); |
| 291 | rc = 0; |
| 292 | fail: |
| 293 | return rc; |
| 294 | } |
| 295 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 296 | static int nbd_send_negotiate(NBDClient *client) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 297 | { |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 298 | int csock = client->sock; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 299 | char buf[8 + 8 + 8 + 128]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 300 | int rc; |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 301 | const int myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM | |
| 302 | NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 303 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 304 | /* Negotiation header without options: |
| 305 | [ 0 .. 7] passwd ("NBDMAGIC") |
| 306 | [ 8 .. 15] magic (NBD_CLIENT_MAGIC) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 307 | [16 .. 23] size |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 308 | [24 .. 25] server flags (0) |
Hani Benhabiles | 5672ee5 | 2014-05-13 00:35:16 +0100 | [diff] [blame] | 309 | [26 .. 27] export flags |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 310 | [28 .. 151] reserved (0) |
| 311 | |
| 312 | Negotiation header with options, part 1: |
| 313 | [ 0 .. 7] passwd ("NBDMAGIC") |
| 314 | [ 8 .. 15] magic (NBD_OPTS_MAGIC) |
| 315 | [16 .. 17] server flags (0) |
| 316 | |
| 317 | part 2 (after options are sent): |
| 318 | [18 .. 25] size |
| 319 | [26 .. 27] export flags |
| 320 | [28 .. 151] reserved (0) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 321 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 322 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 323 | qemu_set_block(csock); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 324 | rc = -EINVAL; |
| 325 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 326 | TRACE("Beginning negotiation."); |
Paolo Bonzini | 8ffaaba | 2012-11-26 15:19:31 +0100 | [diff] [blame] | 327 | memset(buf, 0, sizeof(buf)); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 328 | memcpy(buf, "NBDMAGIC", 8); |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 329 | if (client->exp) { |
| 330 | assert ((client->exp->nbdflags & ~65535) == 0); |
| 331 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_CLIENT_MAGIC); |
| 332 | cpu_to_be64w((uint64_t*)(buf + 16), client->exp->size); |
| 333 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); |
| 334 | } else { |
| 335 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_OPTS_MAGIC); |
| 336 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 337 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 338 | if (client->exp) { |
| 339 | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
| 340 | LOG("write failed"); |
| 341 | goto fail; |
| 342 | } |
| 343 | } else { |
| 344 | if (write_sync(csock, buf, 18) != 18) { |
| 345 | LOG("write failed"); |
| 346 | goto fail; |
| 347 | } |
| 348 | rc = nbd_receive_options(client); |
| 349 | if (rc < 0) { |
| 350 | LOG("option negotiation failed"); |
| 351 | goto fail; |
| 352 | } |
| 353 | |
| 354 | assert ((client->exp->nbdflags & ~65535) == 0); |
| 355 | cpu_to_be64w((uint64_t*)(buf + 18), client->exp->size); |
| 356 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); |
| 357 | if (write_sync(csock, buf + 18, sizeof(buf) - 18) != sizeof(buf) - 18) { |
| 358 | LOG("write failed"); |
| 359 | goto fail; |
| 360 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 361 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 362 | |
Dong Xu Wang | 07f3507 | 2011-11-22 18:06:26 +0800 | [diff] [blame] | 363 | TRACE("Negotiation succeeded."); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 364 | rc = 0; |
| 365 | fail: |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 366 | qemu_set_nonblock(csock); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 367 | return rc; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 368 | } |
| 369 | |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 370 | int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
| 371 | off_t *size, size_t *blocksize) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 372 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 373 | char buf[256]; |
| 374 | uint64_t magic, s; |
| 375 | uint16_t tmp; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 376 | int rc; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 377 | |
Dong Xu Wang | 07f3507 | 2011-11-22 18:06:26 +0800 | [diff] [blame] | 378 | TRACE("Receiving negotiation."); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 379 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 380 | rc = -EINVAL; |
| 381 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 382 | if (read_sync(csock, buf, 8) != 8) { |
| 383 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 384 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 385 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 386 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 387 | buf[8] = '\0'; |
| 388 | if (strlen(buf) == 0) { |
| 389 | LOG("server connection closed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 390 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 391 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 392 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 393 | TRACE("Magic is %c%c%c%c%c%c%c%c", |
| 394 | qemu_isprint(buf[0]) ? buf[0] : '.', |
| 395 | qemu_isprint(buf[1]) ? buf[1] : '.', |
| 396 | qemu_isprint(buf[2]) ? buf[2] : '.', |
| 397 | qemu_isprint(buf[3]) ? buf[3] : '.', |
| 398 | qemu_isprint(buf[4]) ? buf[4] : '.', |
| 399 | qemu_isprint(buf[5]) ? buf[5] : '.', |
| 400 | qemu_isprint(buf[6]) ? buf[6] : '.', |
| 401 | qemu_isprint(buf[7]) ? buf[7] : '.'); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 402 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 403 | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
| 404 | LOG("Invalid magic received"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 405 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 406 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 407 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 408 | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 409 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 410 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 411 | } |
| 412 | magic = be64_to_cpu(magic); |
| 413 | TRACE("Magic is 0x%" PRIx64, magic); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 414 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 415 | if (name) { |
| 416 | uint32_t reserved = 0; |
| 417 | uint32_t opt; |
| 418 | uint32_t namesize; |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 419 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 420 | TRACE("Checking magic (opts_magic)"); |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 421 | if (magic != NBD_OPTS_MAGIC) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 422 | LOG("Bad magic received"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 423 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 424 | } |
| 425 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
| 426 | LOG("flags read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 427 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 428 | } |
| 429 | *flags = be16_to_cpu(tmp) << 16; |
| 430 | /* reserved for future use */ |
| 431 | if (write_sync(csock, &reserved, sizeof(reserved)) != |
| 432 | sizeof(reserved)) { |
| 433 | LOG("write failed (reserved)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 434 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 435 | } |
| 436 | /* write the export name */ |
| 437 | magic = cpu_to_be64(magic); |
| 438 | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 439 | LOG("write failed (magic)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 440 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 441 | } |
| 442 | opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); |
| 443 | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
| 444 | LOG("write failed (opt)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 445 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 446 | } |
| 447 | namesize = cpu_to_be32(strlen(name)); |
| 448 | if (write_sync(csock, &namesize, sizeof(namesize)) != |
| 449 | sizeof(namesize)) { |
| 450 | LOG("write failed (namesize)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 451 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 452 | } |
| 453 | if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { |
| 454 | LOG("write failed (name)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 455 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 456 | } |
| 457 | } else { |
| 458 | TRACE("Checking magic (cli_magic)"); |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 459 | |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 460 | if (magic != NBD_CLIENT_MAGIC) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 461 | LOG("Bad magic received"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 462 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 463 | } |
| 464 | } |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 465 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 466 | if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { |
| 467 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 468 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 469 | } |
| 470 | *size = be64_to_cpu(s); |
| 471 | *blocksize = 1024; |
| 472 | TRACE("Size is %" PRIu64, *size); |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 473 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 474 | if (!name) { |
| 475 | if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { |
| 476 | LOG("read failed (flags)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 477 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 478 | } |
| 479 | *flags = be32_to_cpup(flags); |
| 480 | } else { |
| 481 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
| 482 | LOG("read failed (tmp)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 483 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 484 | } |
| 485 | *flags |= be32_to_cpu(tmp); |
| 486 | } |
| 487 | if (read_sync(csock, &buf, 124) != 124) { |
| 488 | LOG("read failed (buf)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 489 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 490 | } |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 491 | rc = 0; |
| 492 | |
| 493 | fail: |
| 494 | return rc; |
ths | cd831bd | 2008-07-03 10:23:51 +0000 | [diff] [blame] | 495 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 496 | |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 497 | #ifdef __linux__ |
| 498 | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
ths | cd831bd | 2008-07-03 10:23:51 +0000 | [diff] [blame] | 499 | { |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 500 | TRACE("Setting NBD socket"); |
| 501 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 502 | if (ioctl(fd, NBD_SET_SOCK, csock) < 0) { |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 503 | int serrno = errno; |
| 504 | LOG("Failed to set NBD socket"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 505 | return -serrno; |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 506 | } |
| 507 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 508 | TRACE("Setting block size to %lu", (unsigned long)blocksize); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 509 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 510 | if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 511 | int serrno = errno; |
| 512 | LOG("Failed setting NBD block size"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 513 | return -serrno; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 514 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 515 | |
Blue Swirl | 0bfcd59 | 2010-05-22 08:02:12 +0000 | [diff] [blame] | 516 | TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 517 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 518 | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 519 | int serrno = errno; |
| 520 | LOG("Failed setting size (in blocks)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 521 | return -serrno; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 522 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 523 | |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 524 | if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) { |
| 525 | if (errno == ENOTTY) { |
| 526 | int read_only = (flags & NBD_FLAG_READ_ONLY) != 0; |
| 527 | TRACE("Setting readonly attribute"); |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 528 | |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 529 | if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) { |
| 530 | int serrno = errno; |
| 531 | LOG("Failed setting read-only attribute"); |
| 532 | return -serrno; |
| 533 | } |
| 534 | } else { |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 535 | int serrno = errno; |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 536 | LOG("Failed setting flags"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 537 | return -serrno; |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 538 | } |
| 539 | } |
| 540 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 541 | TRACE("Negotiation ended"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 542 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 543 | return 0; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | int nbd_disconnect(int fd) |
| 547 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 548 | ioctl(fd, NBD_CLEAR_QUE); |
| 549 | ioctl(fd, NBD_DISCONNECT); |
| 550 | ioctl(fd, NBD_CLEAR_SOCK); |
| 551 | return 0; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 552 | } |
| 553 | |
Jes Sorensen | 0a4eb86 | 2010-08-31 09:30:33 +0200 | [diff] [blame] | 554 | int nbd_client(int fd) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 555 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 556 | int ret; |
| 557 | int serrno; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 558 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 559 | TRACE("Doing NBD loop"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 560 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 561 | ret = ioctl(fd, NBD_DO_IT); |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 562 | if (ret < 0 && errno == EPIPE) { |
Paolo Bonzini | 7462468 | 2011-11-04 15:51:18 +0100 | [diff] [blame] | 563 | /* NBD_DO_IT normally returns EPIPE when someone has disconnected |
| 564 | * the socket via NBD_DISCONNECT. We do not want to return 1 in |
| 565 | * that case. |
| 566 | */ |
| 567 | ret = 0; |
| 568 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 569 | serrno = errno; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 570 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 571 | TRACE("NBD loop returned %d: %s", ret, strerror(serrno)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 572 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 573 | TRACE("Clearing NBD queue"); |
| 574 | ioctl(fd, NBD_CLEAR_QUE); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 575 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 576 | TRACE("Clearing NBD socket"); |
| 577 | ioctl(fd, NBD_CLEAR_SOCK); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 578 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 579 | errno = serrno; |
| 580 | return ret; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 581 | } |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 582 | #else |
Paolo Bonzini | 8e72506 | 2011-09-21 09:34:12 +0200 | [diff] [blame] | 583 | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 584 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 585 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | int nbd_disconnect(int fd) |
| 589 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 590 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 591 | } |
| 592 | |
Jes Sorensen | 0a4eb86 | 2010-08-31 09:30:33 +0200 | [diff] [blame] | 593 | int nbd_client(int fd) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 594 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 595 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 596 | } |
| 597 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 598 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 599 | ssize_t nbd_send_request(int csock, struct nbd_request *request) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 600 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 601 | uint8_t buf[NBD_REQUEST_SIZE]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 602 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 603 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 604 | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
| 605 | cpu_to_be32w((uint32_t*)(buf + 4), request->type); |
| 606 | cpu_to_be64w((uint64_t*)(buf + 8), request->handle); |
| 607 | cpu_to_be64w((uint64_t*)(buf + 16), request->from); |
| 608 | cpu_to_be32w((uint32_t*)(buf + 24), request->len); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 609 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 610 | TRACE("Sending request to client: " |
| 611 | "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}", |
| 612 | request->from, request->len, request->handle, request->type); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 613 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 614 | ret = write_sync(csock, buf, sizeof(buf)); |
| 615 | if (ret < 0) { |
| 616 | return ret; |
| 617 | } |
| 618 | |
| 619 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 620 | LOG("writing to socket failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 621 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 622 | } |
| 623 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 624 | } |
| 625 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 626 | static ssize_t nbd_receive_request(int csock, struct nbd_request *request) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 627 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 628 | uint8_t buf[NBD_REQUEST_SIZE]; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 629 | uint32_t magic; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 630 | ssize_t ret; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 631 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 632 | ret = read_sync(csock, buf, sizeof(buf)); |
| 633 | if (ret < 0) { |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 638 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 639 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 640 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 641 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 642 | /* Request |
| 643 | [ 0 .. 3] magic (NBD_REQUEST_MAGIC) |
| 644 | [ 4 .. 7] type (0 == READ, 1 == WRITE) |
| 645 | [ 8 .. 15] handle |
| 646 | [16 .. 23] from |
| 647 | [24 .. 27] len |
| 648 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 649 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 650 | magic = be32_to_cpup((uint32_t*)buf); |
| 651 | request->type = be32_to_cpup((uint32_t*)(buf + 4)); |
| 652 | request->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
| 653 | request->from = be64_to_cpup((uint64_t*)(buf + 16)); |
| 654 | request->len = be32_to_cpup((uint32_t*)(buf + 24)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 655 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 656 | TRACE("Got request: " |
| 657 | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
| 658 | magic, request->type, request->from, request->len); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 659 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 660 | if (magic != NBD_REQUEST_MAGIC) { |
| 661 | LOG("invalid magic (got 0x%x)", magic); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 662 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 663 | } |
| 664 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 665 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 666 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 667 | ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 668 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 669 | uint8_t buf[NBD_REPLY_SIZE]; |
| 670 | uint32_t magic; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 671 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 672 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 673 | ret = read_sync(csock, buf, sizeof(buf)); |
| 674 | if (ret < 0) { |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 679 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 680 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 681 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 682 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 683 | /* Reply |
| 684 | [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
| 685 | [ 4 .. 7] error (0 == no error) |
| 686 | [ 7 .. 15] handle |
| 687 | */ |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 688 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 689 | magic = be32_to_cpup((uint32_t*)buf); |
| 690 | reply->error = be32_to_cpup((uint32_t*)(buf + 4)); |
| 691 | reply->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 692 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 693 | TRACE("Got reply: " |
| 694 | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
| 695 | magic, reply->error, reply->handle); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 696 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 697 | if (magic != NBD_REPLY_MAGIC) { |
| 698 | LOG("invalid magic (got 0x%x)", magic); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 699 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 700 | } |
| 701 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 702 | } |
| 703 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 704 | static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 705 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 706 | uint8_t buf[NBD_REPLY_SIZE]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 707 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 708 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 709 | /* Reply |
| 710 | [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
| 711 | [ 4 .. 7] error (0 == no error) |
| 712 | [ 7 .. 15] handle |
| 713 | */ |
| 714 | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
| 715 | cpu_to_be32w((uint32_t*)(buf + 4), reply->error); |
| 716 | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 717 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 718 | TRACE("Sending response to client"); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 719 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 720 | ret = write_sync(csock, buf, sizeof(buf)); |
| 721 | if (ret < 0) { |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 726 | LOG("writing to socket failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 727 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 728 | } |
| 729 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 730 | } |
| 731 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 732 | #define MAX_NBD_REQUESTS 16 |
| 733 | |
Paolo Bonzini | ce33967 | 2012-09-18 13:17:52 +0200 | [diff] [blame] | 734 | void nbd_client_get(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 735 | { |
| 736 | client->refcount++; |
| 737 | } |
| 738 | |
Paolo Bonzini | ce33967 | 2012-09-18 13:17:52 +0200 | [diff] [blame] | 739 | void nbd_client_put(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 740 | { |
| 741 | if (--client->refcount == 0) { |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 742 | /* The last reference should be dropped by client->close, |
| 743 | * which is called by nbd_client_close. |
| 744 | */ |
| 745 | assert(client->closing); |
| 746 | |
| 747 | qemu_set_fd_handler2(client->sock, NULL, NULL, NULL, NULL); |
| 748 | close(client->sock); |
| 749 | client->sock = -1; |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 750 | if (client->exp) { |
| 751 | QTAILQ_REMOVE(&client->exp->clients, client, next); |
| 752 | nbd_export_put(client->exp); |
| 753 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 754 | g_free(client); |
| 755 | } |
| 756 | } |
| 757 | |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 758 | void nbd_client_close(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 759 | { |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 760 | if (client->closing) { |
| 761 | return; |
| 762 | } |
| 763 | |
| 764 | client->closing = true; |
| 765 | |
| 766 | /* Force requests to finish. They will drop their own references, |
| 767 | * then we'll close the socket and free the NBDClient. |
| 768 | */ |
| 769 | shutdown(client->sock, 2); |
| 770 | |
| 771 | /* Also tell the client, so that they release their reference. */ |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 772 | if (client->close) { |
| 773 | client->close(client); |
| 774 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 775 | } |
| 776 | |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 777 | static NBDRequest *nbd_request_get(NBDClient *client) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 778 | { |
| 779 | NBDRequest *req; |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 780 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 781 | assert(client->nb_requests <= MAX_NBD_REQUESTS - 1); |
| 782 | client->nb_requests++; |
| 783 | |
Stefan Hajnoczi | e1adb27 | 2013-05-02 14:23:07 +0200 | [diff] [blame] | 784 | req = g_slice_new0(NBDRequest); |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 785 | nbd_client_get(client); |
| 786 | req->client = client; |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 787 | return req; |
| 788 | } |
| 789 | |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 790 | static void nbd_request_put(NBDRequest *req) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 791 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 792 | NBDClient *client = req->client; |
Stefan Hajnoczi | e1adb27 | 2013-05-02 14:23:07 +0200 | [diff] [blame] | 793 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 794 | if (req->data) { |
| 795 | qemu_vfree(req->data); |
| 796 | } |
Stefan Hajnoczi | e1adb27 | 2013-05-02 14:23:07 +0200 | [diff] [blame] | 797 | g_slice_free(NBDRequest, req); |
| 798 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 799 | if (client->nb_requests-- == MAX_NBD_REQUESTS) { |
| 800 | qemu_notify_event(); |
| 801 | } |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 802 | nbd_client_put(client); |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 803 | } |
| 804 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 805 | NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset, |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 806 | off_t size, uint32_t nbdflags, |
| 807 | void (*close)(NBDExport *)) |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 808 | { |
| 809 | NBDExport *exp = g_malloc0(sizeof(NBDExport)); |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 810 | exp->refcount = 1; |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 811 | QTAILQ_INIT(&exp->clients); |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 812 | exp->bs = bs; |
| 813 | exp->dev_offset = dev_offset; |
| 814 | exp->nbdflags = nbdflags; |
Paolo Bonzini | 38ceff0 | 2012-03-12 16:17:27 +0100 | [diff] [blame] | 815 | exp->size = size == -1 ? bdrv_getlength(bs) : size; |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 816 | exp->close = close; |
Fam Zheng | 38b54b6 | 2013-08-23 09:14:50 +0800 | [diff] [blame] | 817 | bdrv_ref(bs); |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 818 | return exp; |
| 819 | } |
| 820 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 821 | NBDExport *nbd_export_find(const char *name) |
| 822 | { |
| 823 | NBDExport *exp; |
| 824 | QTAILQ_FOREACH(exp, &exports, next) { |
| 825 | if (strcmp(name, exp->name) == 0) { |
| 826 | return exp; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | return NULL; |
| 831 | } |
| 832 | |
| 833 | void nbd_export_set_name(NBDExport *exp, const char *name) |
| 834 | { |
| 835 | if (exp->name == name) { |
| 836 | return; |
| 837 | } |
| 838 | |
| 839 | nbd_export_get(exp); |
| 840 | if (exp->name != NULL) { |
| 841 | g_free(exp->name); |
| 842 | exp->name = NULL; |
| 843 | QTAILQ_REMOVE(&exports, exp, next); |
| 844 | nbd_export_put(exp); |
| 845 | } |
| 846 | if (name != NULL) { |
| 847 | nbd_export_get(exp); |
| 848 | exp->name = g_strdup(name); |
| 849 | QTAILQ_INSERT_TAIL(&exports, exp, next); |
| 850 | } |
| 851 | nbd_export_put(exp); |
| 852 | } |
| 853 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 854 | void nbd_export_close(NBDExport *exp) |
| 855 | { |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 856 | NBDClient *client, *next; |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 857 | |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 858 | nbd_export_get(exp); |
| 859 | QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) { |
| 860 | nbd_client_close(client); |
| 861 | } |
Paolo Bonzini | 125afda | 2012-09-18 14:31:44 +0200 | [diff] [blame] | 862 | nbd_export_set_name(exp, NULL); |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 863 | nbd_export_put(exp); |
Fam Zheng | 38b54b6 | 2013-08-23 09:14:50 +0800 | [diff] [blame] | 864 | if (exp->bs) { |
| 865 | bdrv_unref(exp->bs); |
| 866 | exp->bs = NULL; |
| 867 | } |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | void nbd_export_get(NBDExport *exp) |
| 871 | { |
| 872 | assert(exp->refcount > 0); |
| 873 | exp->refcount++; |
| 874 | } |
| 875 | |
| 876 | void nbd_export_put(NBDExport *exp) |
| 877 | { |
| 878 | assert(exp->refcount > 0); |
| 879 | if (exp->refcount == 1) { |
| 880 | nbd_export_close(exp); |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 881 | } |
| 882 | |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 883 | if (--exp->refcount == 0) { |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 884 | assert(exp->name == NULL); |
| 885 | |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 886 | if (exp->close) { |
| 887 | exp->close(exp); |
| 888 | } |
| 889 | |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 890 | g_free(exp); |
| 891 | } |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 892 | } |
| 893 | |
Paolo Bonzini | 125afda | 2012-09-18 14:31:44 +0200 | [diff] [blame] | 894 | BlockDriverState *nbd_export_get_blockdev(NBDExport *exp) |
| 895 | { |
| 896 | return exp->bs; |
| 897 | } |
| 898 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 899 | void nbd_export_close_all(void) |
| 900 | { |
| 901 | NBDExport *exp, *next; |
| 902 | |
| 903 | QTAILQ_FOREACH_SAFE(exp, &exports, next, next) { |
| 904 | nbd_export_close(exp); |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 905 | } |
| 906 | } |
| 907 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 908 | static int nbd_can_read(void *opaque); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 909 | static void nbd_read(void *opaque); |
| 910 | static void nbd_restart_write(void *opaque); |
| 911 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 912 | static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply, |
| 913 | int len) |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 914 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 915 | NBDClient *client = req->client; |
| 916 | int csock = client->sock; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 917 | ssize_t rc, ret; |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 918 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 919 | qemu_co_mutex_lock(&client->send_lock); |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 920 | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, |
| 921 | nbd_restart_write, client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 922 | client->send_coroutine = qemu_coroutine_self(); |
| 923 | |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 924 | if (!len) { |
| 925 | rc = nbd_send_reply(csock, reply); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 926 | } else { |
| 927 | socket_set_cork(csock, 1); |
| 928 | rc = nbd_send_reply(csock, reply); |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 929 | if (rc >= 0) { |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 930 | ret = qemu_co_send(csock, req->data, len); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 931 | if (ret != len) { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 932 | rc = -EIO; |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 933 | } |
| 934 | } |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 935 | socket_set_cork(csock, 0); |
| 936 | } |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 937 | |
| 938 | client->send_coroutine = NULL; |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 939 | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, NULL, client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 940 | qemu_co_mutex_unlock(&client->send_lock); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 941 | return rc; |
| 942 | } |
| 943 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 944 | static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request) |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 945 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 946 | NBDClient *client = req->client; |
| 947 | int csock = client->sock; |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 948 | uint32_t command; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 949 | ssize_t rc; |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 950 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 951 | client->recv_coroutine = qemu_coroutine_self(); |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 952 | rc = nbd_receive_request(csock, request); |
| 953 | if (rc < 0) { |
| 954 | if (rc != -EAGAIN) { |
| 955 | rc = -EIO; |
| 956 | } |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 957 | goto out; |
| 958 | } |
| 959 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 960 | if (request->len > NBD_MAX_BUFFER_SIZE) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 961 | LOG("len (%u) is larger than max len (%u)", |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 962 | request->len, NBD_MAX_BUFFER_SIZE); |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 963 | rc = -EINVAL; |
| 964 | goto out; |
| 965 | } |
| 966 | |
| 967 | if ((request->from + request->len) < request->from) { |
| 968 | LOG("integer overflow detected! " |
| 969 | "you're probably being attacked"); |
| 970 | rc = -EINVAL; |
| 971 | goto out; |
| 972 | } |
| 973 | |
| 974 | TRACE("Decoding type"); |
| 975 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 976 | command = request->type & NBD_CMD_MASK_COMMAND; |
| 977 | if (command == NBD_CMD_READ || command == NBD_CMD_WRITE) { |
| 978 | req->data = qemu_blockalign(client->exp->bs, request->len); |
| 979 | } |
| 980 | if (command == NBD_CMD_WRITE) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 981 | TRACE("Reading %u byte(s)", request->len); |
| 982 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 983 | if (qemu_co_recv(csock, req->data, request->len) != request->len) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 984 | LOG("reading from socket failed"); |
| 985 | rc = -EIO; |
| 986 | goto out; |
| 987 | } |
| 988 | } |
| 989 | rc = 0; |
| 990 | |
| 991 | out: |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 992 | client->recv_coroutine = NULL; |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 993 | return rc; |
| 994 | } |
| 995 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 996 | static void nbd_trip(void *opaque) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 997 | { |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 998 | NBDClient *client = opaque; |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 999 | NBDExport *exp = client->exp; |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1000 | NBDRequest *req; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1001 | struct nbd_request request; |
| 1002 | struct nbd_reply reply; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1003 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1004 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1005 | TRACE("Reading request."); |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1006 | if (client->closing) { |
| 1007 | return; |
| 1008 | } |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1009 | |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1010 | req = nbd_request_get(client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1011 | ret = nbd_co_receive_request(req, &request); |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 1012 | if (ret == -EAGAIN) { |
| 1013 | goto done; |
| 1014 | } |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1015 | if (ret == -EIO) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1016 | goto out; |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1017 | } |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1018 | |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1019 | reply.handle = request.handle; |
| 1020 | reply.error = 0; |
| 1021 | |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1022 | if (ret < 0) { |
| 1023 | reply.error = -ret; |
| 1024 | goto error_reply; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1025 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1026 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1027 | if ((request.from + request.len) > exp->size) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1028 | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
| 1029 | ", Offset: %" PRIu64 "\n", |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1030 | request.from, request.len, |
Stefan Weil | 0fee8f3 | 2012-04-12 22:30:16 +0200 | [diff] [blame] | 1031 | (uint64_t)exp->size, (uint64_t)exp->dev_offset); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1032 | LOG("requested operation past EOF--bad client?"); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1033 | goto invalid_request; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1034 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1035 | |
Paolo Bonzini | 2c7989a | 2011-10-21 13:16:28 +0200 | [diff] [blame] | 1036 | switch (request.type & NBD_CMD_MASK_COMMAND) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1037 | case NBD_CMD_READ: |
| 1038 | TRACE("Request type is READ"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1039 | |
Paolo Bonzini | e25ceb7 | 2012-04-19 11:59:11 +0200 | [diff] [blame] | 1040 | if (request.type & NBD_CMD_FLAG_FUA) { |
| 1041 | ret = bdrv_co_flush(exp->bs); |
| 1042 | if (ret < 0) { |
| 1043 | LOG("flush failed"); |
| 1044 | reply.error = -ret; |
| 1045 | goto error_reply; |
| 1046 | } |
| 1047 | } |
| 1048 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1049 | ret = bdrv_read(exp->bs, (request.from + exp->dev_offset) / 512, |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1050 | req->data, request.len / 512); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1051 | if (ret < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1052 | LOG("reading from file failed"); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1053 | reply.error = -ret; |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1054 | goto error_reply; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1055 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1056 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1057 | TRACE("Read %u byte(s)", request.len); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1058 | if (nbd_co_send_reply(req, &reply, request.len) < 0) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1059 | goto out; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1060 | break; |
| 1061 | case NBD_CMD_WRITE: |
| 1062 | TRACE("Request type is WRITE"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1063 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1064 | if (exp->nbdflags & NBD_FLAG_READ_ONLY) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1065 | TRACE("Server is read-only, return error"); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1066 | reply.error = EROFS; |
| 1067 | goto error_reply; |
| 1068 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1069 | |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1070 | TRACE("Writing to device"); |
| 1071 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1072 | ret = bdrv_write(exp->bs, (request.from + exp->dev_offset) / 512, |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1073 | req->data, request.len / 512); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1074 | if (ret < 0) { |
| 1075 | LOG("writing to file failed"); |
| 1076 | reply.error = -ret; |
| 1077 | goto error_reply; |
| 1078 | } |
| 1079 | |
| 1080 | if (request.type & NBD_CMD_FLAG_FUA) { |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1081 | ret = bdrv_co_flush(exp->bs); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1082 | if (ret < 0) { |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1083 | LOG("flush failed"); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1084 | reply.error = -ret; |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1085 | goto error_reply; |
Paolo Bonzini | 2c7989a | 2011-10-21 13:16:28 +0200 | [diff] [blame] | 1086 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1087 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1088 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1089 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1090 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1091 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1092 | break; |
| 1093 | case NBD_CMD_DISC: |
| 1094 | TRACE("Request type is DISCONNECT"); |
| 1095 | errno = 0; |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1096 | goto out; |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1097 | case NBD_CMD_FLUSH: |
| 1098 | TRACE("Request type is FLUSH"); |
| 1099 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1100 | ret = bdrv_co_flush(exp->bs); |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1101 | if (ret < 0) { |
| 1102 | LOG("flush failed"); |
| 1103 | reply.error = -ret; |
| 1104 | } |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1105 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1106 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1107 | } |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1108 | break; |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1109 | case NBD_CMD_TRIM: |
| 1110 | TRACE("Request type is TRIM"); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1111 | ret = bdrv_co_discard(exp->bs, (request.from + exp->dev_offset) / 512, |
| 1112 | request.len / 512); |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1113 | if (ret < 0) { |
| 1114 | LOG("discard failed"); |
| 1115 | reply.error = -ret; |
| 1116 | } |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1117 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1118 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1119 | } |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1120 | break; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1121 | default: |
| 1122 | LOG("invalid request type (%u) received", request.type); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1123 | invalid_request: |
| 1124 | reply.error = -EINVAL; |
| 1125 | error_reply: |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1126 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1127 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1128 | } |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1129 | break; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1130 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1131 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1132 | TRACE("Request/Reply complete"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1133 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 1134 | done: |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1135 | nbd_request_put(req); |
| 1136 | return; |
| 1137 | |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1138 | out: |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1139 | nbd_request_put(req); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1140 | nbd_client_close(client); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1141 | } |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1142 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 1143 | static int nbd_can_read(void *opaque) |
| 1144 | { |
| 1145 | NBDClient *client = opaque; |
| 1146 | |
| 1147 | return client->recv_coroutine || client->nb_requests < MAX_NBD_REQUESTS; |
| 1148 | } |
| 1149 | |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1150 | static void nbd_read(void *opaque) |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1151 | { |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1152 | NBDClient *client = opaque; |
| 1153 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1154 | if (client->recv_coroutine) { |
| 1155 | qemu_coroutine_enter(client->recv_coroutine, NULL); |
| 1156 | } else { |
| 1157 | qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client); |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1158 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1159 | } |
| 1160 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1161 | static void nbd_restart_write(void *opaque) |
| 1162 | { |
| 1163 | NBDClient *client = opaque; |
| 1164 | |
| 1165 | qemu_coroutine_enter(client->send_coroutine, NULL); |
| 1166 | } |
| 1167 | |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1168 | NBDClient *nbd_client_new(NBDExport *exp, int csock, |
| 1169 | void (*close)(NBDClient *)) |
| 1170 | { |
| 1171 | NBDClient *client; |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1172 | client = g_malloc0(sizeof(NBDClient)); |
| 1173 | client->refcount = 1; |
| 1174 | client->exp = exp; |
| 1175 | client->sock = csock; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 1176 | if (nbd_send_negotiate(client) < 0) { |
| 1177 | g_free(client); |
| 1178 | return NULL; |
| 1179 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1180 | client->close = close; |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1181 | qemu_co_mutex_init(&client->send_lock); |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 1182 | qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, NULL, client); |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1183 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 1184 | if (exp) { |
| 1185 | QTAILQ_INSERT_TAIL(&exp->clients, client, next); |
| 1186 | nbd_export_get(exp); |
| 1187 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1188 | return client; |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1189 | } |