The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
| 3 | * |
| 4 | * Copyright (c) 2003 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 24 | #include "config-host.h" |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 25 | #include "qemu-common.h" |
David 'Digit' Turner | 6af6765 | 2013-12-14 23:49:32 +0100 | [diff] [blame] | 26 | #include "monitor/monitor.h" |
David 'Digit' Turner | e1e03df | 2013-12-15 00:42:21 +0100 | [diff] [blame] | 27 | #include "block/block_int.h" |
David 'Digit' Turner | 1befd34 | 2014-01-15 17:56:45 +0100 | [diff] [blame] | 28 | #include "qemu/iov.h" |
David 'Digit' Turner | e90d665 | 2013-12-14 14:55:12 +0100 | [diff] [blame] | 29 | #include "qemu/module.h" |
David 'Digit' Turner | 2a7dde0 | 2013-12-15 01:30:16 +0100 | [diff] [blame] | 30 | //#include "qapi/qmp/types.h" |
David 'Digit' Turner | e7216d8 | 2013-12-15 00:51:13 +0100 | [diff] [blame] | 31 | #include "qapi/qmp/qjson.h" |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 32 | |
David 'Digit' Turner | 2c538c8 | 2010-05-10 16:48:20 -0700 | [diff] [blame] | 33 | #ifdef CONFIG_BSD |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 34 | #include <sys/types.h> |
| 35 | #include <sys/stat.h> |
| 36 | #include <sys/ioctl.h> |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 37 | #include <sys/queue.h> |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 38 | #ifndef __DragonFly__ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 39 | #include <sys/disk.h> |
| 40 | #endif |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 41 | #endif |
| 42 | |
| 43 | #ifdef _WIN32 |
| 44 | #include <windows.h> |
| 45 | #endif |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 46 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 47 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
| 48 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 49 | BlockDriverCompletionFunc *cb, void *opaque); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 50 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
| 51 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 52 | BlockDriverCompletionFunc *cb, void *opaque); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 53 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
| 54 | BlockDriverCompletionFunc *cb, void *opaque); |
| 55 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
| 56 | BlockDriverCompletionFunc *cb, void *opaque); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 57 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 58 | uint8_t *buf, int nb_sectors); |
| 59 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 60 | const uint8_t *buf, int nb_sectors); |
| 61 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 62 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
| 63 | QTAILQ_HEAD_INITIALIZER(bdrv_states); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 64 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 65 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 66 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
| 67 | |
| 68 | /* The device to use for VM snapshots */ |
| 69 | static BlockDriverState *bs_snapshots; |
| 70 | |
| 71 | /* If non-zero, use only whitelisted block drivers */ |
| 72 | static int use_bdrv_whitelist; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 73 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 74 | int _path_is_absolute(const char *path) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 75 | { |
| 76 | const char *p; |
| 77 | #ifdef _WIN32 |
| 78 | /* specific case for names like: "\\.\d:" */ |
| 79 | if (*path == '/' || *path == '\\') |
| 80 | return 1; |
| 81 | #endif |
| 82 | p = strchr(path, ':'); |
| 83 | if (p) |
| 84 | p++; |
| 85 | else |
| 86 | p = path; |
| 87 | #ifdef _WIN32 |
| 88 | return (*p == '/' || *p == '\\'); |
| 89 | #else |
| 90 | return (*p == '/'); |
| 91 | #endif |
| 92 | } |
| 93 | |
| 94 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 95 | path to it by considering it is relative to base_path. URL are |
| 96 | supported. */ |
| 97 | void path_combine(char *dest, int dest_size, |
| 98 | const char *base_path, |
| 99 | const char *filename) |
| 100 | { |
| 101 | const char *p, *p1; |
| 102 | int len; |
| 103 | |
| 104 | if (dest_size <= 0) |
| 105 | return; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 106 | if (_path_is_absolute(filename)) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 107 | pstrcpy(dest, dest_size, filename); |
| 108 | } else { |
| 109 | p = strchr(base_path, ':'); |
| 110 | if (p) |
| 111 | p++; |
| 112 | else |
| 113 | p = base_path; |
| 114 | p1 = strrchr(base_path, '/'); |
| 115 | #ifdef _WIN32 |
| 116 | { |
| 117 | const char *p2; |
| 118 | p2 = strrchr(base_path, '\\'); |
| 119 | if (!p1 || p2 > p1) |
| 120 | p1 = p2; |
| 121 | } |
| 122 | #endif |
| 123 | if (p1) |
| 124 | p1++; |
| 125 | else |
| 126 | p1 = base_path; |
| 127 | if (p1 > p) |
| 128 | p = p1; |
| 129 | len = p - base_path; |
| 130 | if (len > dest_size - 1) |
| 131 | len = dest_size - 1; |
| 132 | memcpy(dest, base_path, len); |
| 133 | dest[len] = '\0'; |
| 134 | pstrcat(dest, dest_size, filename); |
| 135 | } |
| 136 | } |
| 137 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 138 | void bdrv_register(BlockDriver *bdrv) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 139 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 140 | if (!bdrv->bdrv_aio_readv) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 141 | /* add AIO emulation layer */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 142 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
| 143 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
| 144 | } else if (!bdrv->bdrv_read) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 145 | /* add synchronous IO emulation layer */ |
| 146 | bdrv->bdrv_read = bdrv_read_em; |
| 147 | bdrv->bdrv_write = bdrv_write_em; |
| 148 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 149 | |
| 150 | if (!bdrv->bdrv_aio_flush) |
| 151 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
| 152 | |
| 153 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | /* create a new block device (by default it is empty) */ |
| 157 | BlockDriverState *bdrv_new(const char *device_name) |
| 158 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 159 | BlockDriverState *bs; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 160 | |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 161 | bs = g_malloc0(sizeof(BlockDriverState)); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 162 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
| 163 | if (device_name[0] != '\0') { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 164 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 165 | } |
| 166 | return bs; |
| 167 | } |
| 168 | |
| 169 | BlockDriver *bdrv_find_format(const char *format_name) |
| 170 | { |
| 171 | BlockDriver *drv1; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 172 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 173 | if (!strcmp(drv1->format_name, format_name)) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 174 | return drv1; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 175 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 176 | } |
| 177 | return NULL; |
| 178 | } |
| 179 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 180 | static int bdrv_is_whitelisted(BlockDriver *drv) |
| 181 | { |
| 182 | static const char *whitelist[] = { |
| 183 | CONFIG_BDRV_WHITELIST |
| 184 | }; |
| 185 | const char **p; |
| 186 | |
| 187 | if (!whitelist[0]) |
| 188 | return 1; /* no whitelist, anything goes */ |
| 189 | |
| 190 | for (p = whitelist; *p; p++) { |
| 191 | if (!strcmp(drv->format_name, *p)) { |
| 192 | return 1; |
| 193 | } |
| 194 | } |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
| 199 | { |
| 200 | BlockDriver *drv = bdrv_find_format(format_name); |
| 201 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
| 202 | } |
| 203 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 204 | int bdrv_create(BlockDriver *drv, const char* filename, |
| 205 | QEMUOptionParameter *options) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 206 | { |
| 207 | if (!drv->bdrv_create) |
| 208 | return -ENOTSUP; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 209 | |
| 210 | return drv->bdrv_create(filename, options); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 211 | } |
| 212 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 213 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
| 214 | { |
| 215 | BlockDriver *drv; |
| 216 | |
| 217 | drv = bdrv_find_protocol(filename); |
| 218 | if (drv == NULL) { |
| 219 | drv = bdrv_find_format("file"); |
| 220 | } |
| 221 | |
| 222 | return bdrv_create(drv, filename, options); |
| 223 | } |
| 224 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 225 | #ifdef _WIN32 |
| 226 | void get_tmp_filename(char *filename, int size) |
| 227 | { |
| 228 | char temp_dir[MAX_PATH]; |
| 229 | |
| 230 | GetTempPath(MAX_PATH, temp_dir); |
| 231 | GetTempFileName(temp_dir, "qem", 0, filename); |
| 232 | } |
| 233 | #else |
| 234 | void get_tmp_filename(char *filename, int size) |
| 235 | { |
| 236 | int fd; |
| 237 | const char *tmpdir; |
| 238 | /* XXX: race condition possible */ |
| 239 | tmpdir = getenv("TMPDIR"); |
| 240 | if (!tmpdir) |
| 241 | tmpdir = "/tmp"; |
| 242 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); |
| 243 | fd = mkstemp(filename); |
| 244 | close(fd); |
| 245 | } |
| 246 | #endif |
| 247 | |
| 248 | #ifdef _WIN32 |
| 249 | static int is_windows_drive_prefix(const char *filename) |
| 250 | { |
| 251 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 252 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 253 | filename[1] == ':'); |
| 254 | } |
| 255 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 256 | int is_windows_drive(const char *filename) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 257 | { |
| 258 | if (is_windows_drive_prefix(filename) && |
| 259 | filename[2] == '\0') |
| 260 | return 1; |
| 261 | if (strstart(filename, "\\\\.\\", NULL) || |
| 262 | strstart(filename, "//./", NULL)) |
| 263 | return 1; |
| 264 | return 0; |
| 265 | } |
| 266 | #endif |
| 267 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 268 | /* |
| 269 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 270 | * recognized as a host CDROM. |
| 271 | */ |
| 272 | static BlockDriver *find_hdev_driver(const char *filename) |
| 273 | { |
| 274 | int score_max = 0, score; |
| 275 | BlockDriver *drv = NULL, *d; |
| 276 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 277 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 278 | if (d->bdrv_probe_device) { |
| 279 | score = d->bdrv_probe_device(filename); |
| 280 | if (score > score_max) { |
| 281 | score_max = score; |
| 282 | drv = d; |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | return drv; |
| 288 | } |
| 289 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 290 | BlockDriver *bdrv_find_protocol(const char *filename) |
| 291 | { |
| 292 | BlockDriver *drv1; |
| 293 | char protocol[128]; |
| 294 | int len; |
| 295 | const char *p; |
| 296 | |
| 297 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 298 | |
| 299 | /* |
| 300 | * XXX(hch): we really should not let host device detection |
| 301 | * override an explicit protocol specification, but moving this |
| 302 | * later breaks access to device names with colons in them. |
| 303 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 304 | * based Linux systems those actually are quite common. |
| 305 | */ |
| 306 | drv1 = find_hdev_driver(filename); |
| 307 | if (drv1) { |
| 308 | return drv1; |
| 309 | } |
| 310 | |
| 311 | #ifdef _WIN32 |
| 312 | if (is_windows_drive(filename) || |
| 313 | is_windows_drive_prefix(filename)) |
| 314 | return bdrv_find_format("file"); |
| 315 | #endif |
| 316 | |
| 317 | p = strchr(filename, ':'); |
| 318 | if (!p) { |
| 319 | return bdrv_find_format("file"); |
| 320 | } |
| 321 | len = p - filename; |
| 322 | if (len > sizeof(protocol) - 1) |
| 323 | len = sizeof(protocol) - 1; |
| 324 | memcpy(protocol, filename, len); |
| 325 | protocol[len] = '\0'; |
| 326 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 327 | if (drv1->protocol_name && |
| 328 | !strcmp(drv1->protocol_name, protocol)) { |
| 329 | return drv1; |
| 330 | } |
| 331 | } |
| 332 | return NULL; |
| 333 | } |
| 334 | |
| 335 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 336 | { |
| 337 | int ret, score, score_max; |
| 338 | BlockDriver *drv1, *drv; |
| 339 | uint8_t buf[2048]; |
| 340 | BlockDriverState *bs; |
| 341 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 342 | ret = bdrv_file_open(&bs, filename, 0); |
| 343 | if (ret < 0) { |
| 344 | *pdrv = NULL; |
| 345 | return ret; |
| 346 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 347 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 348 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
| 349 | if (bs->sg || !bdrv_is_inserted(bs)) { |
| 350 | bdrv_delete(bs); |
| 351 | drv = bdrv_find_format("raw"); |
| 352 | if (!drv) { |
| 353 | ret = -ENOENT; |
| 354 | } |
| 355 | *pdrv = drv; |
| 356 | return ret; |
| 357 | } |
| 358 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 359 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 360 | bdrv_delete(bs); |
| 361 | if (ret < 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 362 | *pdrv = NULL; |
| 363 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | score_max = 0; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 367 | drv = NULL; |
| 368 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 369 | if (drv1->bdrv_probe) { |
| 370 | score = drv1->bdrv_probe(buf, ret, filename); |
| 371 | if (score > score_max) { |
| 372 | score_max = score; |
| 373 | drv = drv1; |
| 374 | } |
| 375 | } |
| 376 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 377 | if (!drv) { |
| 378 | ret = -ENOENT; |
| 379 | } |
| 380 | *pdrv = drv; |
| 381 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 382 | } |
| 383 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 384 | /** |
| 385 | * Set the current 'total_sectors' value |
| 386 | */ |
| 387 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 388 | { |
| 389 | BlockDriver *drv = bs->drv; |
| 390 | |
| 391 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
| 392 | if (bs->sg) |
| 393 | return 0; |
| 394 | |
| 395 | /* query actual device if possible, otherwise just trust the hint */ |
| 396 | if (drv->bdrv_getlength) { |
| 397 | int64_t length = drv->bdrv_getlength(bs); |
| 398 | if (length < 0) { |
| 399 | return length; |
| 400 | } |
| 401 | hint = length >> BDRV_SECTOR_BITS; |
| 402 | } |
| 403 | |
| 404 | bs->total_sectors = hint; |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Common part for opening disk images and files |
| 410 | */ |
| 411 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
| 412 | int flags, BlockDriver *drv) |
| 413 | { |
| 414 | int ret, open_flags; |
| 415 | |
| 416 | assert(drv != NULL); |
| 417 | |
| 418 | bs->file = NULL; |
| 419 | bs->total_sectors = 0; |
| 420 | bs->encrypted = 0; |
| 421 | bs->valid_key = 0; |
| 422 | bs->open_flags = flags; |
| 423 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
| 424 | bs->buffer_alignment = 512; |
| 425 | |
| 426 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 427 | |
| 428 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { |
| 429 | return -ENOTSUP; |
| 430 | } |
| 431 | |
| 432 | bs->drv = drv; |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 433 | bs->opaque = g_malloc0(drv->instance_size); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 434 | |
| 435 | /* |
| 436 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a |
| 437 | * write cache to the guest. We do need the fdatasync to flush |
| 438 | * out transactions for block allocations, and we maybe have a |
| 439 | * volatile write cache in our backing device to deal with. |
| 440 | */ |
| 441 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) |
| 442 | bs->enable_write_cache = 1; |
| 443 | |
| 444 | /* |
| 445 | * Clear flags that are internal to the block layer before opening the |
| 446 | * image. |
| 447 | */ |
| 448 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 449 | |
| 450 | /* |
| 451 | * Snapshots should be writeable. |
| 452 | */ |
| 453 | if (bs->is_temporary) { |
| 454 | open_flags |= BDRV_O_RDWR; |
| 455 | } |
| 456 | |
| 457 | /* Open the image, either directly or using a protocol */ |
| 458 | if (drv->bdrv_file_open) { |
| 459 | ret = drv->bdrv_file_open(bs, filename, open_flags); |
| 460 | } else { |
| 461 | ret = bdrv_file_open(&bs->file, filename, open_flags); |
| 462 | if (ret >= 0) { |
| 463 | ret = drv->bdrv_open(bs, open_flags); |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | if (ret < 0) { |
| 468 | goto free_and_fail; |
| 469 | } |
| 470 | |
| 471 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
| 472 | |
| 473 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 474 | if (ret < 0) { |
| 475 | goto free_and_fail; |
| 476 | } |
| 477 | |
| 478 | #ifndef _WIN32 |
| 479 | if (bs->is_temporary) { |
| 480 | unlink(filename); |
| 481 | } |
| 482 | #endif |
| 483 | return 0; |
| 484 | |
| 485 | free_and_fail: |
| 486 | if (bs->file) { |
| 487 | bdrv_delete(bs->file); |
| 488 | bs->file = NULL; |
| 489 | } |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 490 | g_free(bs->opaque); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 491 | bs->opaque = NULL; |
| 492 | bs->drv = NULL; |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * Opens a file using a protocol (file, host_device, nbd, ...) |
| 498 | */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 499 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 500 | { |
| 501 | BlockDriverState *bs; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 502 | BlockDriver *drv; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 503 | int ret; |
| 504 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 505 | drv = bdrv_find_protocol(filename); |
| 506 | if (!drv) { |
| 507 | return -ENOENT; |
| 508 | } |
| 509 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 510 | bs = bdrv_new(""); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 511 | ret = bdrv_open_common(bs, filename, flags, drv); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 512 | if (ret < 0) { |
| 513 | bdrv_delete(bs); |
| 514 | return ret; |
| 515 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 516 | bs->growable = 1; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 517 | *pbs = bs; |
| 518 | return 0; |
| 519 | } |
| 520 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 521 | /* |
| 522 | * Opens a disk image (raw, qcow2, vmdk, ...) |
| 523 | */ |
| 524 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
| 525 | BlockDriver *drv) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 526 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 527 | int ret; |
| 528 | int probed = 0; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 529 | |
| 530 | if (flags & BDRV_O_SNAPSHOT) { |
| 531 | BlockDriverState *bs1; |
| 532 | int64_t total_size; |
| 533 | int is_protocol = 0; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 534 | BlockDriver *bdrv_qcow2; |
| 535 | QEMUOptionParameter *options; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 536 | char tmp_filename[PATH_MAX]; |
| 537 | char backing_filename[PATH_MAX]; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 538 | |
| 539 | /* if snapshot, we create a temporary backing file and open it |
| 540 | instead of opening 'filename' directly */ |
| 541 | |
| 542 | /* if there is a backing file, use it */ |
| 543 | bs1 = bdrv_new(""); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 544 | ret = bdrv_open(bs1, filename, 0, drv); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 545 | if (ret < 0) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 546 | bdrv_delete(bs1); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 547 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 548 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 549 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 550 | |
| 551 | if (bs1->drv && bs1->drv->protocol_name) |
| 552 | is_protocol = 1; |
| 553 | |
| 554 | bdrv_delete(bs1); |
| 555 | |
| 556 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
| 557 | |
| 558 | /* Real path is meaningless for protocols */ |
| 559 | if (is_protocol) |
| 560 | snprintf(backing_filename, sizeof(backing_filename), |
| 561 | "%s", filename); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 562 | else if (!realpath(filename, backing_filename)) |
| 563 | return -errno; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 564 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 565 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
| 566 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
| 567 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 568 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 569 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
| 570 | if (drv) { |
| 571 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
| 572 | drv->format_name); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 573 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 574 | |
| 575 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 576 | free_option_parameters(options); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 577 | if (ret < 0) { |
| 578 | return ret; |
| 579 | } |
| 580 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 581 | filename = tmp_filename; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 582 | drv = bdrv_qcow2; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 583 | bs->is_temporary = 1; |
| 584 | } |
| 585 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 586 | /* Find the right image format driver */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 587 | if (!drv) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 588 | ret = find_image_format(filename, &drv); |
| 589 | probed = 1; |
| 590 | } |
| 591 | |
| 592 | if (!drv) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 593 | goto unlink_and_fail; |
| 594 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 595 | |
| 596 | /* Open the image */ |
| 597 | ret = bdrv_open_common(bs, filename, flags, drv); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 598 | if (ret < 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 599 | goto unlink_and_fail; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 600 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 601 | |
| 602 | bs->probed = probed; |
| 603 | |
| 604 | /* If there is a backing file, use it */ |
| 605 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
| 606 | char backing_filename[PATH_MAX]; |
| 607 | int back_flags; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 608 | BlockDriver *back_drv = NULL; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 609 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 610 | bs->backing_hd = bdrv_new(""); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 611 | path_combine(backing_filename, sizeof(backing_filename), |
| 612 | filename, bs->backing_file); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 613 | if (bs->backing_format[0] != '\0') |
| 614 | back_drv = bdrv_find_format(bs->backing_format); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 615 | |
| 616 | /* backing files always opened read-only */ |
| 617 | back_flags = |
| 618 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 619 | |
| 620 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 621 | if (ret < 0) { |
| 622 | bdrv_close(bs); |
| 623 | return ret; |
| 624 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 625 | if (bs->is_temporary) { |
| 626 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
| 627 | } else { |
| 628 | /* base image inherits from "parent" */ |
| 629 | bs->backing_hd->keep_read_only = bs->keep_read_only; |
| 630 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 631 | } |
| 632 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 633 | if (!bdrv_key_required(bs)) { |
| 634 | /* call the change callback */ |
| 635 | bs->media_changed = 1; |
| 636 | if (bs->change_cb) |
| 637 | bs->change_cb(bs->change_opaque); |
| 638 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 639 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 640 | return 0; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 641 | |
| 642 | unlink_and_fail: |
| 643 | if (bs->is_temporary) { |
| 644 | unlink(filename); |
| 645 | } |
| 646 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | void bdrv_close(BlockDriverState *bs) |
| 650 | { |
| 651 | if (bs->drv) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 652 | if (bs == bs_snapshots) { |
| 653 | bs_snapshots = NULL; |
| 654 | } |
| 655 | if (bs->backing_hd) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 656 | bdrv_delete(bs->backing_hd); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 657 | bs->backing_hd = NULL; |
| 658 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 659 | bs->drv->bdrv_close(bs); |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 660 | g_free(bs->opaque); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 661 | #ifdef _WIN32 |
| 662 | if (bs->is_temporary) { |
| 663 | unlink(bs->filename); |
| 664 | } |
| 665 | #endif |
| 666 | bs->opaque = NULL; |
| 667 | bs->drv = NULL; |
| 668 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 669 | if (bs->file != NULL) { |
| 670 | bdrv_close(bs->file); |
| 671 | } |
| 672 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 673 | /* call the change callback */ |
| 674 | bs->media_changed = 1; |
| 675 | if (bs->change_cb) |
| 676 | bs->change_cb(bs->change_opaque); |
| 677 | } |
| 678 | } |
| 679 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 680 | void bdrv_close_all(void) |
| 681 | { |
| 682 | BlockDriverState *bs; |
| 683 | |
| 684 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 685 | bdrv_close(bs); |
| 686 | } |
| 687 | } |
| 688 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 689 | void bdrv_delete(BlockDriverState *bs) |
| 690 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 691 | assert(!bs->peer); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 692 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 693 | /* remove from list, if necessary */ |
| 694 | if (bs->device_name[0] != '\0') { |
| 695 | QTAILQ_REMOVE(&bdrv_states, bs, list); |
| 696 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 697 | |
| 698 | bdrv_close(bs); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 699 | if (bs->file != NULL) { |
| 700 | bdrv_delete(bs->file); |
| 701 | } |
| 702 | |
| 703 | assert(bs != bs_snapshots); |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 704 | g_free(bs); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 705 | } |
| 706 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 707 | int bdrv_attach(BlockDriverState *bs, DeviceState *qdev) |
| 708 | { |
| 709 | if (bs->peer) { |
| 710 | return -EBUSY; |
| 711 | } |
| 712 | bs->peer = qdev; |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | void bdrv_detach(BlockDriverState *bs, DeviceState *qdev) |
| 717 | { |
| 718 | assert(bs->peer == qdev); |
| 719 | bs->peer = NULL; |
| 720 | } |
| 721 | |
| 722 | DeviceState *bdrv_get_attached(BlockDriverState *bs) |
| 723 | { |
| 724 | return bs->peer; |
| 725 | } |
| 726 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 727 | /* |
| 728 | * Run consistency checks on an image |
| 729 | * |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 730 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
| 731 | * free of errors) or -errno when an internal error occured. The results of the |
| 732 | * check are stored in res. |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 733 | */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 734 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 735 | { |
| 736 | if (bs->drv->bdrv_check == NULL) { |
| 737 | return -ENOTSUP; |
| 738 | } |
| 739 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 740 | memset(res, 0, sizeof(*res)); |
| 741 | return bs->drv->bdrv_check(bs, res); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 742 | } |
| 743 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 744 | #define COMMIT_BUF_SECTORS 2048 |
| 745 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 746 | /* commit COW file into the raw image */ |
| 747 | int bdrv_commit(BlockDriverState *bs) |
| 748 | { |
| 749 | BlockDriver *drv = bs->drv; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 750 | int64_t sector, total_sectors; |
| 751 | int n, ro, open_flags; |
| 752 | int ret = 0, rw_ret = 0; |
| 753 | uint8_t *buf; |
| 754 | char filename[1024]; |
| 755 | BlockDriverState *bs_rw, *bs_ro; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 756 | |
| 757 | if (!drv) |
| 758 | return -ENOMEDIUM; |
| 759 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 760 | if (!bs->backing_hd) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 761 | return -ENOTSUP; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 762 | } |
| 763 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 764 | if (bs->backing_hd->keep_read_only) { |
| 765 | return -EACCES; |
| 766 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 767 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 768 | ro = bs->backing_hd->read_only; |
| 769 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); |
| 770 | open_flags = bs->backing_hd->open_flags; |
| 771 | |
| 772 | if (ro) { |
| 773 | /* re-open as RW */ |
| 774 | bdrv_delete(bs->backing_hd); |
| 775 | bs->backing_hd = NULL; |
| 776 | bs_rw = bdrv_new(""); |
| 777 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
| 778 | if (rw_ret < 0) { |
| 779 | bdrv_delete(bs_rw); |
| 780 | /* try to re-open read-only */ |
| 781 | bs_ro = bdrv_new(""); |
| 782 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
| 783 | if (ret < 0) { |
| 784 | bdrv_delete(bs_ro); |
| 785 | /* drive not functional anymore */ |
| 786 | bs->drv = NULL; |
| 787 | return ret; |
| 788 | } |
| 789 | bs->backing_hd = bs_ro; |
| 790 | return rw_ret; |
| 791 | } |
| 792 | bs->backing_hd = bs_rw; |
| 793 | } |
| 794 | |
| 795 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 796 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 797 | |
| 798 | for (sector = 0; sector < total_sectors; sector += n) { |
| 799 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
| 800 | |
| 801 | if (bdrv_read(bs, sector, buf, n) != 0) { |
| 802 | ret = -EIO; |
| 803 | goto ro_cleanup; |
| 804 | } |
| 805 | |
| 806 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
| 807 | ret = -EIO; |
| 808 | goto ro_cleanup; |
| 809 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 810 | } |
| 811 | } |
| 812 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 813 | if (drv->bdrv_make_empty) { |
| 814 | ret = drv->bdrv_make_empty(bs); |
| 815 | bdrv_flush(bs); |
| 816 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 817 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 818 | /* |
| 819 | * Make sure all data we wrote to the backing device is actually |
| 820 | * stable on disk. |
| 821 | */ |
| 822 | if (bs->backing_hd) |
| 823 | bdrv_flush(bs->backing_hd); |
| 824 | |
| 825 | ro_cleanup: |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 826 | g_free(buf); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 827 | |
| 828 | if (ro) { |
| 829 | /* re-open as RO */ |
| 830 | bdrv_delete(bs->backing_hd); |
| 831 | bs->backing_hd = NULL; |
| 832 | bs_ro = bdrv_new(""); |
| 833 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
| 834 | if (ret < 0) { |
| 835 | bdrv_delete(bs_ro); |
| 836 | /* drive not functional anymore */ |
| 837 | bs->drv = NULL; |
| 838 | return ret; |
| 839 | } |
| 840 | bs->backing_hd = bs_ro; |
| 841 | bs->backing_hd->keep_read_only = 0; |
| 842 | } |
| 843 | |
| 844 | return ret; |
| 845 | } |
| 846 | |
| 847 | void bdrv_commit_all(void) |
| 848 | { |
| 849 | BlockDriverState *bs; |
| 850 | |
| 851 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 852 | bdrv_commit(bs); |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | /* |
| 857 | * Return values: |
| 858 | * 0 - success |
| 859 | * -EINVAL - backing format specified, but no file |
| 860 | * -ENOSPC - can't update the backing file because no space is left in the |
| 861 | * image file header |
| 862 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 863 | */ |
| 864 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 865 | const char *backing_file, const char *backing_fmt) |
| 866 | { |
| 867 | BlockDriver *drv = bs->drv; |
| 868 | |
| 869 | if (drv->bdrv_change_backing_file != NULL) { |
| 870 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
| 871 | } else { |
| 872 | return -ENOTSUP; |
| 873 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 874 | } |
| 875 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 876 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 877 | size_t size) |
| 878 | { |
| 879 | int64_t len; |
| 880 | |
| 881 | if (!bdrv_is_inserted(bs)) |
| 882 | return -ENOMEDIUM; |
| 883 | |
| 884 | if (bs->growable) |
| 885 | return 0; |
| 886 | |
| 887 | len = bdrv_getlength(bs); |
| 888 | |
| 889 | if (offset < 0) |
| 890 | return -EIO; |
| 891 | |
| 892 | if ((offset > len) || (len - offset < size)) |
| 893 | return -EIO; |
| 894 | |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 899 | int nb_sectors) |
| 900 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 901 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
| 902 | nb_sectors * BDRV_SECTOR_SIZE); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 903 | } |
| 904 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 905 | /* return < 0 if error. See bdrv_write() for the return codes */ |
| 906 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
| 907 | uint8_t *buf, int nb_sectors) |
| 908 | { |
| 909 | BlockDriver *drv = bs->drv; |
| 910 | |
| 911 | if (!drv) |
| 912 | return -ENOMEDIUM; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 913 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 914 | return -EIO; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 915 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 916 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 917 | } |
| 918 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 919 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
| 920 | int nb_sectors, int dirty) |
| 921 | { |
| 922 | int64_t start, end; |
| 923 | unsigned long val, idx, bit; |
| 924 | |
| 925 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 926 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 927 | |
| 928 | for (; start <= end; start++) { |
| 929 | idx = start / (sizeof(unsigned long) * 8); |
| 930 | bit = start % (sizeof(unsigned long) * 8); |
| 931 | val = bs->dirty_bitmap[idx]; |
| 932 | if (dirty) { |
| 933 | if (!(val & (1 << bit))) { |
| 934 | bs->dirty_count++; |
| 935 | val |= 1 << bit; |
| 936 | } |
| 937 | } else { |
| 938 | if (val & (1 << bit)) { |
| 939 | bs->dirty_count--; |
| 940 | val &= ~(1 << bit); |
| 941 | } |
| 942 | } |
| 943 | bs->dirty_bitmap[idx] = val; |
| 944 | } |
| 945 | } |
| 946 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 947 | /* Return < 0 if error. Important errors are: |
| 948 | -EIO generic I/O error (may happen for all errors) |
| 949 | -ENOMEDIUM No media inserted. |
| 950 | -EINVAL Invalid sector number or nb_sectors |
| 951 | -EACCES Trying to write a read-only device |
| 952 | */ |
| 953 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
| 954 | const uint8_t *buf, int nb_sectors) |
| 955 | { |
| 956 | BlockDriver *drv = bs->drv; |
| 957 | if (!bs->drv) |
| 958 | return -ENOMEDIUM; |
| 959 | if (bs->read_only) |
| 960 | return -EACCES; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 961 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 962 | return -EIO; |
| 963 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 964 | if (bs->dirty_bitmap) { |
| 965 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
| 966 | } |
| 967 | |
| 968 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 969 | bs->wr_highest_sector = sector_num + nb_sectors - 1; |
| 970 | } |
| 971 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 972 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 973 | } |
| 974 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 975 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
| 976 | void *buf, int count1) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 977 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 978 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 979 | int len, nb_sectors, count; |
| 980 | int64_t sector_num; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 981 | int ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 982 | |
| 983 | count = count1; |
| 984 | /* first read to align to sector start */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 985 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 986 | if (len > count) |
| 987 | len = count; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 988 | sector_num = offset >> BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 989 | if (len > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 990 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 991 | return ret; |
| 992 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 993 | count -= len; |
| 994 | if (count == 0) |
| 995 | return count1; |
| 996 | sector_num++; |
| 997 | buf += len; |
| 998 | } |
| 999 | |
| 1000 | /* read the sectors "in place" */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1001 | nb_sectors = count >> BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1002 | if (nb_sectors > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1003 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
| 1004 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1005 | sector_num += nb_sectors; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1006 | len = nb_sectors << BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1007 | buf += len; |
| 1008 | count -= len; |
| 1009 | } |
| 1010 | |
| 1011 | /* add data from the last sector */ |
| 1012 | if (count > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1013 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1014 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1015 | memcpy(buf, tmp_buf, count); |
| 1016 | } |
| 1017 | return count1; |
| 1018 | } |
| 1019 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1020 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
| 1021 | const void *buf, int count1) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1022 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1023 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1024 | int len, nb_sectors, count; |
| 1025 | int64_t sector_num; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1026 | int ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1027 | |
| 1028 | count = count1; |
| 1029 | /* first write to align to sector start */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1030 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1031 | if (len > count) |
| 1032 | len = count; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1033 | sector_num = offset >> BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1034 | if (len > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1035 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1036 | return ret; |
| 1037 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
| 1038 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1039 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1040 | count -= len; |
| 1041 | if (count == 0) |
| 1042 | return count1; |
| 1043 | sector_num++; |
| 1044 | buf += len; |
| 1045 | } |
| 1046 | |
| 1047 | /* write the sectors "in place" */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1048 | nb_sectors = count >> BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1049 | if (nb_sectors > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1050 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
| 1051 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1052 | sector_num += nb_sectors; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1053 | len = nb_sectors << BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1054 | buf += len; |
| 1055 | count -= len; |
| 1056 | } |
| 1057 | |
| 1058 | /* add data from the last sector */ |
| 1059 | if (count > 0) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1060 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1061 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1062 | memcpy(tmp_buf, buf, count); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1063 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1064 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1065 | } |
| 1066 | return count1; |
| 1067 | } |
| 1068 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1069 | /* |
| 1070 | * Writes to the file and ensures that no writes are reordered across this |
| 1071 | * request (acts as a barrier) |
| 1072 | * |
| 1073 | * Returns 0 on success, -errno in error cases. |
| 1074 | */ |
| 1075 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, |
| 1076 | const void *buf, int count) |
| 1077 | { |
| 1078 | int ret; |
| 1079 | |
| 1080 | ret = bdrv_pwrite(bs, offset, buf, count); |
| 1081 | if (ret < 0) { |
| 1082 | return ret; |
| 1083 | } |
| 1084 | |
| 1085 | /* No flush needed for cache=writethrough, it uses O_DSYNC */ |
| 1086 | if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { |
| 1087 | bdrv_flush(bs); |
| 1088 | } |
| 1089 | |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * Writes to the file and ensures that no writes are reordered across this |
| 1095 | * request (acts as a barrier) |
| 1096 | * |
| 1097 | * Returns 0 on success, -errno in error cases. |
| 1098 | */ |
| 1099 | int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, |
| 1100 | const uint8_t *buf, int nb_sectors) |
| 1101 | { |
| 1102 | return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, |
| 1103 | buf, BDRV_SECTOR_SIZE * nb_sectors); |
| 1104 | } |
| 1105 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1106 | /** |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1107 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 1108 | */ |
| 1109 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 1110 | { |
| 1111 | BlockDriver *drv = bs->drv; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1112 | int ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1113 | if (!drv) |
| 1114 | return -ENOMEDIUM; |
| 1115 | if (!drv->bdrv_truncate) |
| 1116 | return -ENOTSUP; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1117 | if (bs->read_only) |
| 1118 | return -EACCES; |
| 1119 | ret = drv->bdrv_truncate(bs, offset); |
| 1120 | if (ret == 0) { |
| 1121 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
| 1122 | } |
| 1123 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | /** |
| 1127 | * Length of a file in bytes. Return < 0 if error or unknown. |
| 1128 | */ |
| 1129 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 1130 | { |
| 1131 | BlockDriver *drv = bs->drv; |
| 1132 | if (!drv) |
| 1133 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1134 | |
| 1135 | /* Fixed size devices use the total_sectors value for speed instead of |
| 1136 | issuing a length query (like lseek) on each call. Also, legacy block |
| 1137 | drivers don't provide a bdrv_getlength function and must use |
| 1138 | total_sectors. */ |
| 1139 | if (!bs->growable || !drv->bdrv_getlength) { |
| 1140 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1141 | } |
| 1142 | return drv->bdrv_getlength(bs); |
| 1143 | } |
| 1144 | |
| 1145 | /* return 0 as number of sectors if no device present or error */ |
| 1146 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
| 1147 | { |
| 1148 | int64_t length; |
| 1149 | length = bdrv_getlength(bs); |
| 1150 | if (length < 0) |
| 1151 | length = 0; |
| 1152 | else |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1153 | length = length >> BDRV_SECTOR_BITS; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1154 | *nb_sectors_ptr = length; |
| 1155 | } |
| 1156 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1157 | struct partition { |
| 1158 | uint8_t boot_ind; /* 0x80 - active */ |
| 1159 | uint8_t head; /* starting head */ |
| 1160 | uint8_t sector; /* starting sector */ |
| 1161 | uint8_t cyl; /* starting cylinder */ |
| 1162 | uint8_t sys_ind; /* What partition type */ |
| 1163 | uint8_t end_head; /* end head */ |
| 1164 | uint8_t end_sector; /* end sector */ |
| 1165 | uint8_t end_cyl; /* end cylinder */ |
| 1166 | uint32_t start_sect; /* starting sector counting from 0 */ |
| 1167 | uint32_t nr_sects; /* nr of sectors in partition */ |
| 1168 | } __attribute__((packed)); |
| 1169 | |
| 1170 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ |
| 1171 | static int guess_disk_lchs(BlockDriverState *bs, |
| 1172 | int *pcylinders, int *pheads, int *psectors) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1173 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1174 | uint8_t buf[BDRV_SECTOR_SIZE]; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1175 | int ret, i, heads, sectors, cylinders; |
| 1176 | struct partition *p; |
| 1177 | uint32_t nr_sects; |
| 1178 | uint64_t nb_sectors; |
| 1179 | |
| 1180 | bdrv_get_geometry(bs, &nb_sectors); |
| 1181 | |
| 1182 | ret = bdrv_read(bs, 0, buf, 1); |
| 1183 | if (ret < 0) |
| 1184 | return -1; |
| 1185 | /* test msdos magic */ |
| 1186 | if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 1187 | return -1; |
| 1188 | for(i = 0; i < 4; i++) { |
| 1189 | p = ((struct partition *)(buf + 0x1be)) + i; |
| 1190 | nr_sects = le32_to_cpu(p->nr_sects); |
| 1191 | if (nr_sects && p->end_head) { |
| 1192 | /* We make the assumption that the partition terminates on |
| 1193 | a cylinder boundary */ |
| 1194 | heads = p->end_head + 1; |
| 1195 | sectors = p->end_sector & 63; |
| 1196 | if (sectors == 0) |
| 1197 | continue; |
| 1198 | cylinders = nb_sectors / (heads * sectors); |
| 1199 | if (cylinders < 1 || cylinders > 16383) |
| 1200 | continue; |
| 1201 | *pheads = heads; |
| 1202 | *psectors = sectors; |
| 1203 | *pcylinders = cylinders; |
| 1204 | #if 0 |
| 1205 | printf("guessed geometry: LCHS=%d %d %d\n", |
| 1206 | cylinders, heads, sectors); |
| 1207 | #endif |
| 1208 | return 0; |
| 1209 | } |
| 1210 | } |
| 1211 | return -1; |
| 1212 | } |
| 1213 | |
| 1214 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 1215 | { |
| 1216 | int translation, lba_detected = 0; |
| 1217 | int cylinders, heads, secs; |
| 1218 | uint64_t nb_sectors; |
| 1219 | |
| 1220 | /* if a geometry hint is available, use it */ |
| 1221 | bdrv_get_geometry(bs, &nb_sectors); |
| 1222 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 1223 | translation = bdrv_get_translation_hint(bs); |
| 1224 | if (cylinders != 0) { |
| 1225 | *pcyls = cylinders; |
| 1226 | *pheads = heads; |
| 1227 | *psecs = secs; |
| 1228 | } else { |
| 1229 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 1230 | if (heads > 16) { |
| 1231 | /* if heads > 16, it means that a BIOS LBA |
| 1232 | translation was active, so the default |
| 1233 | hardware geometry is OK */ |
| 1234 | lba_detected = 1; |
| 1235 | goto default_geometry; |
| 1236 | } else { |
| 1237 | *pcyls = cylinders; |
| 1238 | *pheads = heads; |
| 1239 | *psecs = secs; |
| 1240 | /* disable any translation to be in sync with |
| 1241 | the logical geometry */ |
| 1242 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { |
| 1243 | bdrv_set_translation_hint(bs, |
| 1244 | BIOS_ATA_TRANSLATION_NONE); |
| 1245 | } |
| 1246 | } |
| 1247 | } else { |
| 1248 | default_geometry: |
| 1249 | /* if no geometry, use a standard physical disk geometry */ |
| 1250 | cylinders = nb_sectors / (16 * 63); |
| 1251 | |
| 1252 | if (cylinders > 16383) |
| 1253 | cylinders = 16383; |
| 1254 | else if (cylinders < 2) |
| 1255 | cylinders = 2; |
| 1256 | *pcyls = cylinders; |
| 1257 | *pheads = 16; |
| 1258 | *psecs = 63; |
| 1259 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 1260 | if ((*pcyls * *pheads) <= 131072) { |
| 1261 | bdrv_set_translation_hint(bs, |
| 1262 | BIOS_ATA_TRANSLATION_LARGE); |
| 1263 | } else { |
| 1264 | bdrv_set_translation_hint(bs, |
| 1265 | BIOS_ATA_TRANSLATION_LBA); |
| 1266 | } |
| 1267 | } |
| 1268 | } |
| 1269 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 1270 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
| 1274 | int cyls, int heads, int secs) |
| 1275 | { |
| 1276 | bs->cyls = cyls; |
| 1277 | bs->heads = heads; |
| 1278 | bs->secs = secs; |
| 1279 | } |
| 1280 | |
| 1281 | void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 1282 | { |
| 1283 | bs->type = type; |
| 1284 | bs->removable = ((type == BDRV_TYPE_CDROM || |
| 1285 | type == BDRV_TYPE_FLOPPY)); |
| 1286 | } |
| 1287 | |
| 1288 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 1289 | { |
| 1290 | bs->translation = translation; |
| 1291 | } |
| 1292 | |
| 1293 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
| 1294 | int *pcyls, int *pheads, int *psecs) |
| 1295 | { |
| 1296 | *pcyls = bs->cyls; |
| 1297 | *pheads = bs->heads; |
| 1298 | *psecs = bs->secs; |
| 1299 | } |
| 1300 | |
| 1301 | int bdrv_get_type_hint(BlockDriverState *bs) |
| 1302 | { |
| 1303 | return bs->type; |
| 1304 | } |
| 1305 | |
| 1306 | int bdrv_get_translation_hint(BlockDriverState *bs) |
| 1307 | { |
| 1308 | return bs->translation; |
| 1309 | } |
| 1310 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1311 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
| 1312 | BlockErrorAction on_write_error) |
| 1313 | { |
| 1314 | bs->on_read_error = on_read_error; |
| 1315 | bs->on_write_error = on_write_error; |
| 1316 | } |
| 1317 | |
| 1318 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) |
| 1319 | { |
| 1320 | return is_read ? bs->on_read_error : bs->on_write_error; |
| 1321 | } |
| 1322 | |
| 1323 | void bdrv_set_removable(BlockDriverState *bs, int removable) |
| 1324 | { |
| 1325 | bs->removable = removable; |
| 1326 | if (removable && bs == bs_snapshots) { |
| 1327 | bs_snapshots = NULL; |
| 1328 | } |
| 1329 | } |
| 1330 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1331 | int bdrv_is_removable(BlockDriverState *bs) |
| 1332 | { |
| 1333 | return bs->removable; |
| 1334 | } |
| 1335 | |
| 1336 | int bdrv_is_read_only(BlockDriverState *bs) |
| 1337 | { |
| 1338 | return bs->read_only; |
| 1339 | } |
| 1340 | |
| 1341 | int bdrv_is_sg(BlockDriverState *bs) |
| 1342 | { |
| 1343 | return bs->sg; |
| 1344 | } |
| 1345 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1346 | int bdrv_enable_write_cache(BlockDriverState *bs) |
| 1347 | { |
| 1348 | return bs->enable_write_cache; |
| 1349 | } |
| 1350 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1351 | /* XXX: no longer used */ |
| 1352 | void bdrv_set_change_cb(BlockDriverState *bs, |
| 1353 | void (*change_cb)(void *opaque), void *opaque) |
| 1354 | { |
| 1355 | bs->change_cb = change_cb; |
| 1356 | bs->change_opaque = opaque; |
| 1357 | } |
| 1358 | |
| 1359 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 1360 | { |
| 1361 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 1362 | return 1; |
| 1363 | return bs->encrypted; |
| 1364 | } |
| 1365 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1366 | int bdrv_key_required(BlockDriverState *bs) |
| 1367 | { |
| 1368 | BlockDriverState *backing_hd = bs->backing_hd; |
| 1369 | |
| 1370 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
| 1371 | return 1; |
| 1372 | return (bs->encrypted && !bs->valid_key); |
| 1373 | } |
| 1374 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1375 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 1376 | { |
| 1377 | int ret; |
| 1378 | if (bs->backing_hd && bs->backing_hd->encrypted) { |
| 1379 | ret = bdrv_set_key(bs->backing_hd, key); |
| 1380 | if (ret < 0) |
| 1381 | return ret; |
| 1382 | if (!bs->encrypted) |
| 1383 | return 0; |
| 1384 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1385 | if (!bs->encrypted) { |
| 1386 | return -EINVAL; |
| 1387 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 1388 | return -ENOMEDIUM; |
| 1389 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1390 | ret = bs->drv->bdrv_set_key(bs, key); |
| 1391 | if (ret < 0) { |
| 1392 | bs->valid_key = 0; |
| 1393 | } else if (!bs->valid_key) { |
| 1394 | bs->valid_key = 1; |
| 1395 | /* call the change callback now, we skipped it on open */ |
| 1396 | bs->media_changed = 1; |
| 1397 | if (bs->change_cb) |
| 1398 | bs->change_cb(bs->change_opaque); |
| 1399 | } |
| 1400 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1401 | } |
| 1402 | |
| 1403 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 1404 | { |
| 1405 | if (!bs->drv) { |
| 1406 | buf[0] = '\0'; |
| 1407 | } else { |
| 1408 | pstrcpy(buf, buf_size, bs->drv->format_name); |
| 1409 | } |
| 1410 | } |
| 1411 | |
| 1412 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 1413 | void *opaque) |
| 1414 | { |
| 1415 | BlockDriver *drv; |
| 1416 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1417 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1418 | it(opaque, drv->format_name); |
| 1419 | } |
| 1420 | } |
| 1421 | |
| 1422 | BlockDriverState *bdrv_find(const char *name) |
| 1423 | { |
| 1424 | BlockDriverState *bs; |
| 1425 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1426 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 1427 | if (!strcmp(name, bs->device_name)) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1428 | return bs; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1429 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1430 | } |
| 1431 | return NULL; |
| 1432 | } |
| 1433 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1434 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 1435 | { |
| 1436 | if (!bs) { |
| 1437 | return QTAILQ_FIRST(&bdrv_states); |
| 1438 | } |
| 1439 | return QTAILQ_NEXT(bs, list); |
| 1440 | } |
| 1441 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1442 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1443 | { |
| 1444 | BlockDriverState *bs; |
| 1445 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1446 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1447 | it(opaque, bs); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1448 | } |
| 1449 | } |
| 1450 | |
| 1451 | const char *bdrv_get_device_name(BlockDriverState *bs) |
| 1452 | { |
| 1453 | return bs->device_name; |
| 1454 | } |
| 1455 | |
| 1456 | void bdrv_flush(BlockDriverState *bs) |
| 1457 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1458 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1459 | return; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1460 | } |
| 1461 | |
| 1462 | if (bs->drv && bs->drv->bdrv_flush) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1463 | bs->drv->bdrv_flush(bs); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1464 | } |
| 1465 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1466 | void bdrv_flush_all(void) |
| 1467 | { |
| 1468 | BlockDriverState *bs; |
| 1469 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1470 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 1471 | if (bs->drv && !bdrv_is_read_only(bs) && |
| 1472 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1473 | bdrv_flush(bs); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1474 | } |
| 1475 | } |
| 1476 | } |
| 1477 | |
| 1478 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 1479 | { |
| 1480 | assert(bs->drv); |
| 1481 | |
| 1482 | if (bs->drv->bdrv_has_zero_init) { |
| 1483 | return bs->drv->bdrv_has_zero_init(bs); |
| 1484 | } |
| 1485 | |
| 1486 | return 1; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1487 | } |
| 1488 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1489 | /* |
| 1490 | * Returns true iff the specified sector is present in the disk image. Drivers |
| 1491 | * not implementing the functionality are assumed to not support backing files, |
| 1492 | * hence all their sectors are reported as allocated. |
| 1493 | * |
| 1494 | * 'pnum' is set to the number of sectors (including and immediately following |
| 1495 | * the specified sector) that are known to be in the same |
| 1496 | * allocated/unallocated state. |
| 1497 | * |
| 1498 | * 'nb_sectors' is the max value 'pnum' should be set to. |
| 1499 | */ |
| 1500 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 1501 | int *pnum) |
| 1502 | { |
| 1503 | int64_t n; |
| 1504 | if (!bs->drv->bdrv_is_allocated) { |
| 1505 | if (sector_num >= bs->total_sectors) { |
| 1506 | *pnum = 0; |
| 1507 | return 0; |
| 1508 | } |
| 1509 | n = bs->total_sectors - sector_num; |
| 1510 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 1511 | return 1; |
| 1512 | } |
| 1513 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
| 1514 | } |
| 1515 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1516 | void bdrv_mon_event(const BlockDriverState *bdrv, |
| 1517 | BlockMonEventAction action, int is_read) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1518 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1519 | QObject *data; |
| 1520 | const char *action_str; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1521 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1522 | switch (action) { |
| 1523 | case BDRV_ACTION_REPORT: |
| 1524 | action_str = "report"; |
| 1525 | break; |
| 1526 | case BDRV_ACTION_IGNORE: |
| 1527 | action_str = "ignore"; |
| 1528 | break; |
| 1529 | case BDRV_ACTION_STOP: |
| 1530 | action_str = "stop"; |
| 1531 | break; |
| 1532 | default: |
| 1533 | abort(); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1534 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1535 | |
| 1536 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", |
| 1537 | bdrv->device_name, |
| 1538 | action_str, |
| 1539 | is_read ? "read" : "write"); |
| 1540 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
| 1541 | |
| 1542 | qobject_decref(data); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1543 | } |
| 1544 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1545 | static void bdrv_print_dict(QObject *obj, void *opaque) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1546 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1547 | QDict *bs_dict; |
| 1548 | Monitor *mon = opaque; |
| 1549 | |
| 1550 | bs_dict = qobject_to_qdict(obj); |
| 1551 | |
| 1552 | monitor_printf(mon, "%s: type=%s removable=%d", |
| 1553 | qdict_get_str(bs_dict, "device"), |
| 1554 | qdict_get_str(bs_dict, "type"), |
| 1555 | qdict_get_bool(bs_dict, "removable")); |
| 1556 | |
| 1557 | if (qdict_get_bool(bs_dict, "removable")) { |
| 1558 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
| 1559 | } |
| 1560 | |
| 1561 | if (qdict_haskey(bs_dict, "inserted")) { |
| 1562 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); |
| 1563 | |
| 1564 | monitor_printf(mon, " file="); |
| 1565 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); |
| 1566 | if (qdict_haskey(qdict, "backing_file")) { |
| 1567 | monitor_printf(mon, " backing_file="); |
| 1568 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); |
| 1569 | } |
| 1570 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", |
| 1571 | qdict_get_bool(qdict, "ro"), |
| 1572 | qdict_get_str(qdict, "drv"), |
| 1573 | qdict_get_bool(qdict, "encrypted")); |
| 1574 | } else { |
| 1575 | monitor_printf(mon, " [not inserted]"); |
| 1576 | } |
| 1577 | |
| 1578 | monitor_printf(mon, "\n"); |
| 1579 | } |
| 1580 | |
| 1581 | void bdrv_info_print(Monitor *mon, const QObject *data) |
| 1582 | { |
| 1583 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
| 1584 | } |
| 1585 | |
| 1586 | void bdrv_info(Monitor *mon, QObject **ret_data) |
| 1587 | { |
| 1588 | QList *bs_list; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1589 | BlockDriverState *bs; |
| 1590 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1591 | bs_list = qlist_new(); |
| 1592 | |
| 1593 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 1594 | QObject *bs_obj; |
| 1595 | const char *type = "unknown"; |
| 1596 | |
| 1597 | switch(bs->type) { |
| 1598 | case BDRV_TYPE_HD: |
| 1599 | type = "hd"; |
| 1600 | break; |
| 1601 | case BDRV_TYPE_CDROM: |
| 1602 | type = "cdrom"; |
| 1603 | break; |
| 1604 | case BDRV_TYPE_FLOPPY: |
| 1605 | type = "floppy"; |
| 1606 | break; |
| 1607 | } |
| 1608 | |
| 1609 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " |
| 1610 | "'removable': %i, 'locked': %i }", |
| 1611 | bs->device_name, type, bs->removable, |
| 1612 | bs->locked); |
| 1613 | |
| 1614 | if (bs->drv) { |
| 1615 | QObject *obj; |
| 1616 | QDict *bs_dict = qobject_to_qdict(bs_obj); |
| 1617 | |
| 1618 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " |
| 1619 | "'encrypted': %i }", |
| 1620 | bs->filename, bs->read_only, |
| 1621 | bs->drv->format_name, |
| 1622 | bdrv_is_encrypted(bs)); |
| 1623 | if (bs->backing_file[0] != '\0') { |
| 1624 | QDict *qdict = qobject_to_qdict(obj); |
| 1625 | qdict_put(qdict, "backing_file", |
| 1626 | qstring_from_str(bs->backing_file)); |
| 1627 | } |
| 1628 | |
| 1629 | qdict_put_obj(bs_dict, "inserted", obj); |
| 1630 | } |
| 1631 | qlist_append_obj(bs_list, bs_obj); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1632 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1633 | |
| 1634 | *ret_data = QOBJECT(bs_list); |
| 1635 | } |
| 1636 | |
| 1637 | static void bdrv_stats_iter(QObject *data, void *opaque) |
| 1638 | { |
| 1639 | QDict *qdict; |
| 1640 | Monitor *mon = opaque; |
| 1641 | |
| 1642 | qdict = qobject_to_qdict(data); |
| 1643 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
| 1644 | |
| 1645 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); |
| 1646 | monitor_printf(mon, " rd_bytes=%" PRId64 |
| 1647 | " wr_bytes=%" PRId64 |
| 1648 | " rd_operations=%" PRId64 |
| 1649 | " wr_operations=%" PRId64 |
| 1650 | "\n", |
| 1651 | qdict_get_int(qdict, "rd_bytes"), |
| 1652 | qdict_get_int(qdict, "wr_bytes"), |
| 1653 | qdict_get_int(qdict, "rd_operations"), |
| 1654 | qdict_get_int(qdict, "wr_operations")); |
| 1655 | } |
| 1656 | |
| 1657 | void bdrv_stats_print(Monitor *mon, const QObject *data) |
| 1658 | { |
| 1659 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
| 1660 | } |
| 1661 | |
| 1662 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
| 1663 | { |
| 1664 | QObject *res; |
| 1665 | QDict *dict; |
| 1666 | |
| 1667 | res = qobject_from_jsonf("{ 'stats': {" |
| 1668 | "'rd_bytes': %" PRId64 "," |
| 1669 | "'wr_bytes': %" PRId64 "," |
| 1670 | "'rd_operations': %" PRId64 "," |
| 1671 | "'wr_operations': %" PRId64 "," |
| 1672 | "'wr_highest_offset': %" PRId64 |
| 1673 | "} }", |
| 1674 | bs->rd_bytes, bs->wr_bytes, |
| 1675 | bs->rd_ops, bs->wr_ops, |
| 1676 | bs->wr_highest_sector * |
| 1677 | (uint64_t)BDRV_SECTOR_SIZE); |
| 1678 | dict = qobject_to_qdict(res); |
| 1679 | |
| 1680 | if (*bs->device_name) { |
| 1681 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); |
| 1682 | } |
| 1683 | |
| 1684 | if (bs->file) { |
| 1685 | QObject *parent = bdrv_info_stats_bs(bs->file); |
| 1686 | qdict_put_obj(dict, "parent", parent); |
| 1687 | } |
| 1688 | |
| 1689 | return res; |
| 1690 | } |
| 1691 | |
| 1692 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
| 1693 | { |
| 1694 | QObject *obj; |
| 1695 | QList *devices; |
| 1696 | BlockDriverState *bs; |
| 1697 | |
| 1698 | devices = qlist_new(); |
| 1699 | |
| 1700 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
| 1701 | obj = bdrv_info_stats_bs(bs); |
| 1702 | qlist_append_obj(devices, obj); |
| 1703 | } |
| 1704 | |
| 1705 | *ret_data = QOBJECT(devices); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1706 | } |
| 1707 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1708 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 1709 | { |
| 1710 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 1711 | return bs->backing_file; |
| 1712 | else if (bs->encrypted) |
| 1713 | return bs->filename; |
| 1714 | else |
| 1715 | return NULL; |
| 1716 | } |
| 1717 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1718 | void bdrv_get_backing_filename(BlockDriverState *bs, |
| 1719 | char *filename, int filename_size) |
| 1720 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1721 | if (!bs->backing_file) { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1722 | pstrcpy(filename, filename_size, ""); |
| 1723 | } else { |
| 1724 | pstrcpy(filename, filename_size, bs->backing_file); |
| 1725 | } |
| 1726 | } |
| 1727 | |
| 1728 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
| 1729 | const uint8_t *buf, int nb_sectors) |
| 1730 | { |
| 1731 | BlockDriver *drv = bs->drv; |
| 1732 | if (!drv) |
| 1733 | return -ENOMEDIUM; |
| 1734 | if (!drv->bdrv_write_compressed) |
| 1735 | return -ENOTSUP; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1736 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 1737 | return -EIO; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1738 | |
| 1739 | if (bs->dirty_bitmap) { |
| 1740 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
| 1741 | } |
| 1742 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1743 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
| 1744 | } |
| 1745 | |
| 1746 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 1747 | { |
| 1748 | BlockDriver *drv = bs->drv; |
| 1749 | if (!drv) |
| 1750 | return -ENOMEDIUM; |
| 1751 | if (!drv->bdrv_get_info) |
| 1752 | return -ENOTSUP; |
| 1753 | memset(bdi, 0, sizeof(*bdi)); |
| 1754 | return drv->bdrv_get_info(bs, bdi); |
| 1755 | } |
| 1756 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1757 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 1758 | int64_t pos, int size) |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1759 | { |
| 1760 | BlockDriver *drv = bs->drv; |
| 1761 | if (!drv) |
| 1762 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1763 | if (drv->bdrv_save_vmstate) |
| 1764 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
| 1765 | if (bs->file) |
| 1766 | return bdrv_save_vmstate(bs->file, buf, pos, size); |
| 1767 | return -ENOTSUP; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1768 | } |
| 1769 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1770 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
| 1771 | int64_t pos, int size) |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1772 | { |
| 1773 | BlockDriver *drv = bs->drv; |
| 1774 | if (!drv) |
| 1775 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1776 | if (drv->bdrv_load_vmstate) |
| 1777 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
| 1778 | if (bs->file) |
| 1779 | return bdrv_load_vmstate(bs->file, buf, pos, size); |
| 1780 | return -ENOTSUP; |
| 1781 | } |
| 1782 | |
| 1783 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
| 1784 | { |
| 1785 | BlockDriver *drv = bs->drv; |
| 1786 | |
| 1787 | if (!drv || !drv->bdrv_debug_event) { |
| 1788 | return; |
| 1789 | } |
| 1790 | |
| 1791 | return drv->bdrv_debug_event(bs, event); |
| 1792 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1793 | } |
| 1794 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1795 | /**************************************************************/ |
| 1796 | /* handling of snapshots */ |
| 1797 | |
Ot ten Thije | 8f2de6d | 2010-09-30 14:17:10 +0100 | [diff] [blame] | 1798 | int bdrv_can_snapshot(BlockDriverState *bs) |
| 1799 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1800 | BlockDriver *drv = bs->drv; |
| 1801 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { |
| 1802 | return 0; |
| 1803 | } |
| 1804 | |
| 1805 | if (!drv->bdrv_snapshot_create) { |
| 1806 | if (bs->file != NULL) { |
| 1807 | return bdrv_can_snapshot(bs->file); |
| 1808 | } |
| 1809 | return 0; |
| 1810 | } |
| 1811 | |
| 1812 | return 1; |
| 1813 | } |
| 1814 | |
| 1815 | int bdrv_is_snapshot(BlockDriverState *bs) |
| 1816 | { |
| 1817 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
| 1818 | } |
| 1819 | |
| 1820 | BlockDriverState *bdrv_snapshots(void) |
| 1821 | { |
| 1822 | BlockDriverState *bs; |
| 1823 | |
| 1824 | if (bs_snapshots) { |
| 1825 | return bs_snapshots; |
| 1826 | } |
| 1827 | |
| 1828 | bs = NULL; |
| 1829 | while ((bs = bdrv_next(bs))) { |
| 1830 | if (bdrv_can_snapshot(bs)) { |
| 1831 | bs_snapshots = bs; |
| 1832 | return bs; |
| 1833 | } |
| 1834 | } |
| 1835 | return NULL; |
Ot ten Thije | 8f2de6d | 2010-09-30 14:17:10 +0100 | [diff] [blame] | 1836 | } |
| 1837 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1838 | int bdrv_snapshot_create(BlockDriverState *bs, |
| 1839 | QEMUSnapshotInfo *sn_info) |
| 1840 | { |
| 1841 | BlockDriver *drv = bs->drv; |
| 1842 | if (!drv) |
| 1843 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1844 | if (drv->bdrv_snapshot_create) |
| 1845 | return drv->bdrv_snapshot_create(bs, sn_info); |
| 1846 | if (bs->file) |
| 1847 | return bdrv_snapshot_create(bs->file, sn_info); |
| 1848 | return -ENOTSUP; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1849 | } |
| 1850 | |
| 1851 | int bdrv_snapshot_goto(BlockDriverState *bs, |
| 1852 | const char *snapshot_id) |
| 1853 | { |
| 1854 | BlockDriver *drv = bs->drv; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1855 | int ret, open_ret; |
| 1856 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1857 | if (!drv) |
| 1858 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1859 | if (drv->bdrv_snapshot_goto) |
| 1860 | return drv->bdrv_snapshot_goto(bs, snapshot_id); |
| 1861 | |
| 1862 | if (bs->file) { |
| 1863 | drv->bdrv_close(bs); |
| 1864 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
| 1865 | open_ret = drv->bdrv_open(bs, bs->open_flags); |
| 1866 | if (open_ret < 0) { |
| 1867 | bdrv_delete(bs->file); |
| 1868 | bs->drv = NULL; |
| 1869 | return open_ret; |
| 1870 | } |
| 1871 | return ret; |
| 1872 | } |
| 1873 | |
| 1874 | return -ENOTSUP; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1875 | } |
| 1876 | |
| 1877 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1878 | { |
| 1879 | BlockDriver *drv = bs->drv; |
| 1880 | if (!drv) |
| 1881 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1882 | if (drv->bdrv_snapshot_delete) |
| 1883 | return drv->bdrv_snapshot_delete(bs, snapshot_id); |
| 1884 | if (bs->file) |
| 1885 | return bdrv_snapshot_delete(bs->file, snapshot_id); |
| 1886 | return -ENOTSUP; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1887 | } |
| 1888 | |
| 1889 | int bdrv_snapshot_list(BlockDriverState *bs, |
| 1890 | QEMUSnapshotInfo **psn_info) |
| 1891 | { |
| 1892 | BlockDriver *drv = bs->drv; |
| 1893 | if (!drv) |
| 1894 | return -ENOMEDIUM; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1895 | if (drv->bdrv_snapshot_list) |
| 1896 | return drv->bdrv_snapshot_list(bs, psn_info); |
| 1897 | if (bs->file) |
| 1898 | return bdrv_snapshot_list(bs->file, psn_info); |
| 1899 | return -ENOTSUP; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1900 | } |
| 1901 | |
| 1902 | #define NB_SUFFIXES 4 |
| 1903 | |
| 1904 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1905 | { |
| 1906 | static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1907 | int64_t base; |
| 1908 | int i; |
| 1909 | |
| 1910 | if (size <= 999) { |
| 1911 | snprintf(buf, buf_size, "%" PRId64, size); |
| 1912 | } else { |
| 1913 | base = 1024; |
| 1914 | for(i = 0; i < NB_SUFFIXES; i++) { |
| 1915 | if (size < (10 * base)) { |
| 1916 | snprintf(buf, buf_size, "%0.1f%c", |
| 1917 | (double)size / base, |
| 1918 | suffixes[i]); |
| 1919 | break; |
| 1920 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1921 | snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1922 | ((size + (base >> 1)) / base), |
| 1923 | suffixes[i]); |
| 1924 | break; |
| 1925 | } |
| 1926 | base = base * 1024; |
| 1927 | } |
| 1928 | } |
| 1929 | return buf; |
| 1930 | } |
| 1931 | |
| 1932 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1933 | { |
| 1934 | char buf1[128], date_buf[128], clock_buf[128]; |
| 1935 | #ifdef _WIN32 |
| 1936 | struct tm *ptm; |
| 1937 | #else |
| 1938 | struct tm tm; |
| 1939 | #endif |
| 1940 | time_t ti; |
| 1941 | int64_t secs; |
| 1942 | |
| 1943 | if (!sn) { |
| 1944 | snprintf(buf, buf_size, |
| 1945 | "%-10s%-20s%7s%20s%15s", |
| 1946 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1947 | } else { |
| 1948 | ti = sn->date_sec; |
| 1949 | #ifdef _WIN32 |
| 1950 | ptm = localtime(&ti); |
| 1951 | strftime(date_buf, sizeof(date_buf), |
| 1952 | "%Y-%m-%d %H:%M:%S", ptm); |
| 1953 | #else |
| 1954 | localtime_r(&ti, &tm); |
| 1955 | strftime(date_buf, sizeof(date_buf), |
| 1956 | "%Y-%m-%d %H:%M:%S", &tm); |
| 1957 | #endif |
| 1958 | secs = sn->vm_clock_nsec / 1000000000; |
| 1959 | snprintf(clock_buf, sizeof(clock_buf), |
| 1960 | "%02d:%02d:%02d.%03d", |
| 1961 | (int)(secs / 3600), |
| 1962 | (int)((secs / 60) % 60), |
| 1963 | (int)(secs % 60), |
| 1964 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1965 | snprintf(buf, buf_size, |
| 1966 | "%-10s%-20s%7s%20s%15s", |
| 1967 | sn->id_str, sn->name, |
| 1968 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), |
| 1969 | date_buf, |
| 1970 | clock_buf); |
| 1971 | } |
| 1972 | return buf; |
| 1973 | } |
| 1974 | |
| 1975 | |
| 1976 | /**************************************************************/ |
| 1977 | /* async I/Os */ |
| 1978 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1979 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 1980 | QEMUIOVector *qiov, int nb_sectors, |
| 1981 | BlockDriverCompletionFunc *cb, void *opaque) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1982 | { |
| 1983 | BlockDriver *drv = bs->drv; |
| 1984 | BlockDriverAIOCB *ret; |
| 1985 | |
| 1986 | if (!drv) |
| 1987 | return NULL; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1988 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 1989 | return NULL; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1990 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1991 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
| 1992 | cb, opaque); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1993 | |
| 1994 | if (ret) { |
| 1995 | /* Update stats even though technically transfer has not happened. */ |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 1996 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1997 | bs->rd_ops ++; |
| 1998 | } |
| 1999 | |
| 2000 | return ret; |
| 2001 | } |
| 2002 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2003 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 2004 | QEMUIOVector *qiov, int nb_sectors, |
| 2005 | BlockDriverCompletionFunc *cb, void *opaque) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2006 | { |
| 2007 | BlockDriver *drv = bs->drv; |
| 2008 | BlockDriverAIOCB *ret; |
| 2009 | |
| 2010 | if (!drv) |
| 2011 | return NULL; |
| 2012 | if (bs->read_only) |
| 2013 | return NULL; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2014 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 2015 | return NULL; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2016 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2017 | if (bs->dirty_bitmap) { |
| 2018 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
| 2019 | } |
| 2020 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2021 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
| 2022 | cb, opaque); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2023 | |
| 2024 | if (ret) { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2025 | /* Update stats even though technically transfer has not happened. */ |
| 2026 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
| 2027 | bs->wr_ops ++; |
| 2028 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 2029 | bs->wr_highest_sector = sector_num + nb_sectors - 1; |
| 2030 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2031 | } |
| 2032 | |
| 2033 | return ret; |
| 2034 | } |
| 2035 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2036 | |
| 2037 | typedef struct MultiwriteCB { |
| 2038 | int error; |
| 2039 | int num_requests; |
| 2040 | int num_callbacks; |
| 2041 | struct { |
| 2042 | BlockDriverCompletionFunc *cb; |
| 2043 | void *opaque; |
| 2044 | QEMUIOVector *free_qiov; |
| 2045 | void *free_buf; |
| 2046 | } callbacks[]; |
| 2047 | } MultiwriteCB; |
| 2048 | |
| 2049 | static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 2050 | { |
| 2051 | int i; |
| 2052 | |
| 2053 | for (i = 0; i < mcb->num_callbacks; i++) { |
| 2054 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
| 2055 | if (mcb->callbacks[i].free_qiov) { |
| 2056 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
| 2057 | } |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2058 | g_free(mcb->callbacks[i].free_qiov); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2059 | qemu_vfree(mcb->callbacks[i].free_buf); |
| 2060 | } |
| 2061 | } |
| 2062 | |
| 2063 | static void multiwrite_cb(void *opaque, int ret) |
| 2064 | { |
| 2065 | MultiwriteCB *mcb = opaque; |
| 2066 | |
| 2067 | if (ret < 0 && !mcb->error) { |
| 2068 | mcb->error = ret; |
| 2069 | } |
| 2070 | |
| 2071 | mcb->num_requests--; |
| 2072 | if (mcb->num_requests == 0) { |
| 2073 | multiwrite_user_cb(mcb); |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2074 | g_free(mcb); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | static int multiwrite_req_compare(const void *a, const void *b) |
| 2079 | { |
| 2080 | const BlockRequest *req1 = a, *req2 = b; |
| 2081 | |
| 2082 | /* |
| 2083 | * Note that we can't simply subtract req2->sector from req1->sector |
| 2084 | * here as that could overflow the return value. |
| 2085 | */ |
| 2086 | if (req1->sector > req2->sector) { |
| 2087 | return 1; |
| 2088 | } else if (req1->sector < req2->sector) { |
| 2089 | return -1; |
| 2090 | } else { |
| 2091 | return 0; |
| 2092 | } |
| 2093 | } |
| 2094 | |
| 2095 | /* |
| 2096 | * Takes a bunch of requests and tries to merge them. Returns the number of |
| 2097 | * requests that remain after merging. |
| 2098 | */ |
| 2099 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 2100 | int num_reqs, MultiwriteCB *mcb) |
| 2101 | { |
| 2102 | int i, outidx; |
| 2103 | |
| 2104 | // Sort requests by start sector |
| 2105 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
| 2106 | |
| 2107 | // Check if adjacent requests touch the same clusters. If so, combine them, |
| 2108 | // filling up gaps with zero sectors. |
| 2109 | outidx = 0; |
| 2110 | for (i = 1; i < num_reqs; i++) { |
| 2111 | int merge = 0; |
| 2112 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 2113 | |
| 2114 | // This handles the cases that are valid for all block drivers, namely |
| 2115 | // exactly sequential writes and overlapping writes. |
| 2116 | if (reqs[i].sector <= oldreq_last) { |
| 2117 | merge = 1; |
| 2118 | } |
| 2119 | |
| 2120 | // The block driver may decide that it makes sense to combine requests |
| 2121 | // even if there is a gap of some sectors between them. In this case, |
| 2122 | // the gap is filled with zeros (therefore only applicable for yet |
| 2123 | // unused space in format like qcow2). |
| 2124 | if (!merge && bs->drv->bdrv_merge_requests) { |
| 2125 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
| 2126 | } |
| 2127 | |
| 2128 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
| 2129 | merge = 0; |
| 2130 | } |
| 2131 | |
| 2132 | if (merge) { |
| 2133 | size_t size; |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2134 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2135 | qemu_iovec_init(qiov, |
| 2136 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); |
| 2137 | |
| 2138 | // Add the first request to the merged one. If the requests are |
| 2139 | // overlapping, drop the last sectors of the first request. |
| 2140 | size = (reqs[i].sector - reqs[outidx].sector) << 9; |
David 'Digit' Turner | 1befd34 | 2014-01-15 17:56:45 +0100 | [diff] [blame] | 2141 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2142 | |
| 2143 | // We might need to add some zeros between the two requests |
| 2144 | if (reqs[i].sector > oldreq_last) { |
| 2145 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; |
| 2146 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
| 2147 | memset(buf, 0, zero_bytes); |
| 2148 | qemu_iovec_add(qiov, buf, zero_bytes); |
| 2149 | mcb->callbacks[i].free_buf = buf; |
| 2150 | } |
| 2151 | |
| 2152 | // Add the second request |
David 'Digit' Turner | 1befd34 | 2014-01-15 17:56:45 +0100 | [diff] [blame] | 2153 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2154 | |
| 2155 | reqs[outidx].nb_sectors = qiov->size >> 9; |
| 2156 | reqs[outidx].qiov = qiov; |
| 2157 | |
| 2158 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 2159 | } else { |
| 2160 | outidx++; |
| 2161 | reqs[outidx].sector = reqs[i].sector; |
| 2162 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 2163 | reqs[outidx].qiov = reqs[i].qiov; |
| 2164 | } |
| 2165 | } |
| 2166 | |
| 2167 | return outidx + 1; |
| 2168 | } |
| 2169 | |
| 2170 | /* |
| 2171 | * Submit multiple AIO write requests at once. |
| 2172 | * |
| 2173 | * On success, the function returns 0 and all requests in the reqs array have |
| 2174 | * been submitted. In error case this function returns -1, and any of the |
| 2175 | * requests may or may not be submitted yet. In particular, this means that the |
| 2176 | * callback will be called for some of the requests, for others it won't. The |
| 2177 | * caller must check the error field of the BlockRequest to wait for the right |
| 2178 | * callbacks (if error != 0, no callback will be called). |
| 2179 | * |
| 2180 | * The implementation may modify the contents of the reqs array, e.g. to merge |
| 2181 | * requests. However, the fields opaque and error are left unmodified as they |
| 2182 | * are used to signal failure for a single request to the caller. |
| 2183 | */ |
| 2184 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 2185 | { |
| 2186 | BlockDriverAIOCB *acb; |
| 2187 | MultiwriteCB *mcb; |
| 2188 | int i; |
| 2189 | |
| 2190 | if (num_reqs == 0) { |
| 2191 | return 0; |
| 2192 | } |
| 2193 | |
| 2194 | // Create MultiwriteCB structure |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2195 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2196 | mcb->num_requests = 0; |
| 2197 | mcb->num_callbacks = num_reqs; |
| 2198 | |
| 2199 | for (i = 0; i < num_reqs; i++) { |
| 2200 | mcb->callbacks[i].cb = reqs[i].cb; |
| 2201 | mcb->callbacks[i].opaque = reqs[i].opaque; |
| 2202 | } |
| 2203 | |
| 2204 | // Check for mergable requests |
| 2205 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 2206 | |
| 2207 | /* |
| 2208 | * Run the aio requests. As soon as one request can't be submitted |
| 2209 | * successfully, fail all requests that are not yet submitted (we must |
| 2210 | * return failure for all requests anyway) |
| 2211 | * |
| 2212 | * num_requests cannot be set to the right value immediately: If |
| 2213 | * bdrv_aio_writev fails for some request, num_requests would be too high |
| 2214 | * and therefore multiwrite_cb() would never recognize the multiwrite |
| 2215 | * request as completed. We also cannot use the loop variable i to set it |
| 2216 | * when the first request fails because the callback may already have been |
| 2217 | * called for previously submitted requests. Thus, num_requests must be |
| 2218 | * incremented for each request that is submitted. |
| 2219 | * |
| 2220 | * The problem that callbacks may be called early also means that we need |
| 2221 | * to take care that num_requests doesn't become 0 before all requests are |
| 2222 | * submitted - multiwrite_cb() would consider the multiwrite request |
| 2223 | * completed. A dummy request that is "completed" by a manual call to |
| 2224 | * multiwrite_cb() takes care of this. |
| 2225 | */ |
| 2226 | mcb->num_requests = 1; |
| 2227 | |
| 2228 | for (i = 0; i < num_reqs; i++) { |
| 2229 | mcb->num_requests++; |
| 2230 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
| 2231 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
| 2232 | |
| 2233 | if (acb == NULL) { |
| 2234 | // We can only fail the whole thing if no request has been |
| 2235 | // submitted yet. Otherwise we'll wait for the submitted AIOs to |
| 2236 | // complete and report the error in the callback. |
| 2237 | if (i == 0) { |
| 2238 | goto fail; |
| 2239 | } else { |
| 2240 | multiwrite_cb(mcb, -EIO); |
| 2241 | break; |
| 2242 | } |
| 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | /* Complete the dummy request */ |
| 2247 | multiwrite_cb(mcb, 0); |
| 2248 | |
| 2249 | return 0; |
| 2250 | |
| 2251 | fail: |
| 2252 | for (i = 0; i < mcb->num_callbacks; i++) { |
| 2253 | reqs[i].error = -EIO; |
| 2254 | } |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2255 | g_free(mcb); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2256 | return -1; |
| 2257 | } |
| 2258 | |
| 2259 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
| 2260 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2261 | { |
| 2262 | BlockDriver *drv = bs->drv; |
| 2263 | |
| 2264 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
| 2265 | return bdrv_aio_noop_em(bs, cb, opaque); |
| 2266 | } |
| 2267 | |
| 2268 | if (!drv) |
| 2269 | return NULL; |
| 2270 | return drv->bdrv_aio_flush(bs, cb, opaque); |
| 2271 | } |
| 2272 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2273 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
| 2274 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2275 | acb->pool->cancel(acb); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2276 | } |
| 2277 | |
| 2278 | |
| 2279 | /**************************************************************/ |
| 2280 | /* async block device emulation */ |
| 2281 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2282 | typedef struct BlockDriverAIOCBSync { |
| 2283 | BlockDriverAIOCB common; |
| 2284 | QEMUBH *bh; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2285 | int ret; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2286 | /* vector translation state */ |
| 2287 | QEMUIOVector *qiov; |
| 2288 | uint8_t *bounce; |
| 2289 | int is_write; |
| 2290 | } BlockDriverAIOCBSync; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2291 | |
| 2292 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 2293 | { |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2294 | BlockDriverAIOCBSync *acb = |
| 2295 | container_of(blockacb, BlockDriverAIOCBSync, common); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2296 | qemu_bh_delete(acb->bh); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2297 | acb->bh = NULL; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2298 | qemu_aio_release(acb); |
| 2299 | } |
| 2300 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2301 | static AIOPool bdrv_em_aio_pool = { |
| 2302 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
| 2303 | .cancel = bdrv_aio_cancel_em, |
| 2304 | }; |
| 2305 | |
| 2306 | static void bdrv_aio_bh_cb(void *opaque) |
| 2307 | { |
| 2308 | BlockDriverAIOCBSync *acb = opaque; |
| 2309 | |
| 2310 | if (!acb->is_write) |
David 'Digit' Turner | 1befd34 | 2014-01-15 17:56:45 +0100 | [diff] [blame] | 2311 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2312 | qemu_vfree(acb->bounce); |
| 2313 | acb->common.cb(acb->common.opaque, acb->ret); |
| 2314 | qemu_bh_delete(acb->bh); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2315 | acb->bh = NULL; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2316 | qemu_aio_release(acb); |
| 2317 | } |
| 2318 | |
| 2319 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
| 2320 | int64_t sector_num, |
| 2321 | QEMUIOVector *qiov, |
| 2322 | int nb_sectors, |
| 2323 | BlockDriverCompletionFunc *cb, |
| 2324 | void *opaque, |
| 2325 | int is_write) |
| 2326 | |
| 2327 | { |
| 2328 | BlockDriverAIOCBSync *acb; |
| 2329 | |
| 2330 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2331 | acb->is_write = is_write; |
| 2332 | acb->qiov = qiov; |
| 2333 | acb->bounce = qemu_blockalign(bs, qiov->size); |
| 2334 | |
| 2335 | if (!acb->bh) |
| 2336 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2337 | |
| 2338 | if (is_write) { |
David 'Digit' Turner | 1befd34 | 2014-01-15 17:56:45 +0100 | [diff] [blame] | 2339 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2340 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
| 2341 | } else { |
| 2342 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
| 2343 | } |
| 2344 | |
| 2345 | qemu_bh_schedule(acb->bh); |
| 2346 | |
| 2347 | return &acb->common; |
| 2348 | } |
| 2349 | |
| 2350 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
| 2351 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| 2352 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2353 | { |
| 2354 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
| 2355 | } |
| 2356 | |
| 2357 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
| 2358 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| 2359 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2360 | { |
| 2361 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 2362 | } |
| 2363 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2364 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
| 2365 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2366 | { |
| 2367 | BlockDriverAIOCBSync *acb; |
| 2368 | |
| 2369 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2370 | acb->is_write = 1; /* don't bounce in the completion hadler */ |
| 2371 | acb->qiov = NULL; |
| 2372 | acb->bounce = NULL; |
| 2373 | acb->ret = 0; |
| 2374 | |
| 2375 | if (!acb->bh) |
| 2376 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2377 | |
| 2378 | bdrv_flush(bs); |
| 2379 | qemu_bh_schedule(acb->bh); |
| 2380 | return &acb->common; |
| 2381 | } |
| 2382 | |
| 2383 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
| 2384 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2385 | { |
| 2386 | BlockDriverAIOCBSync *acb; |
| 2387 | |
| 2388 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 2389 | acb->is_write = 1; /* don't bounce in the completion handler */ |
| 2390 | acb->qiov = NULL; |
| 2391 | acb->bounce = NULL; |
| 2392 | acb->ret = 0; |
| 2393 | |
| 2394 | if (!acb->bh) { |
| 2395 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 2396 | } |
| 2397 | |
| 2398 | qemu_bh_schedule(acb->bh); |
| 2399 | return &acb->common; |
| 2400 | } |
| 2401 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2402 | /**************************************************************/ |
| 2403 | /* sync block device emulation */ |
| 2404 | |
| 2405 | static void bdrv_rw_em_cb(void *opaque, int ret) |
| 2406 | { |
| 2407 | *(int *)opaque = ret; |
| 2408 | } |
| 2409 | |
| 2410 | #define NOT_DONE 0x7fffffff |
| 2411 | |
| 2412 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 2413 | uint8_t *buf, int nb_sectors) |
| 2414 | { |
| 2415 | int async_ret; |
| 2416 | BlockDriverAIOCB *acb; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2417 | struct iovec iov; |
| 2418 | QEMUIOVector qiov; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2419 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2420 | async_context_push(); |
| 2421 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2422 | async_ret = NOT_DONE; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2423 | iov.iov_base = (void *)buf; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2424 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2425 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2426 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
| 2427 | bdrv_rw_em_cb, &async_ret); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2428 | if (acb == NULL) { |
| 2429 | async_ret = -1; |
| 2430 | goto fail; |
| 2431 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2432 | |
| 2433 | while (async_ret == NOT_DONE) { |
| 2434 | qemu_aio_wait(); |
| 2435 | } |
| 2436 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2437 | |
| 2438 | fail: |
| 2439 | async_context_pop(); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2440 | return async_ret; |
| 2441 | } |
| 2442 | |
| 2443 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 2444 | const uint8_t *buf, int nb_sectors) |
| 2445 | { |
| 2446 | int async_ret; |
| 2447 | BlockDriverAIOCB *acb; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2448 | struct iovec iov; |
| 2449 | QEMUIOVector qiov; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2450 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2451 | async_context_push(); |
| 2452 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2453 | async_ret = NOT_DONE; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2454 | iov.iov_base = (void *)buf; |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2455 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2456 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2457 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
| 2458 | bdrv_rw_em_cb, &async_ret); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2459 | if (acb == NULL) { |
| 2460 | async_ret = -1; |
| 2461 | goto fail; |
| 2462 | } |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2463 | while (async_ret == NOT_DONE) { |
| 2464 | qemu_aio_wait(); |
| 2465 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2466 | |
| 2467 | fail: |
| 2468 | async_context_pop(); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2469 | return async_ret; |
| 2470 | } |
| 2471 | |
| 2472 | void bdrv_init(void) |
| 2473 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2474 | module_call_init(MODULE_INIT_BLOCK); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2475 | } |
| 2476 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2477 | void bdrv_init_with_whitelist(void) |
| 2478 | { |
| 2479 | use_bdrv_whitelist = 1; |
| 2480 | bdrv_init(); |
| 2481 | } |
| 2482 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2483 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
| 2484 | BlockDriverCompletionFunc *cb, void *opaque) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2485 | { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2486 | BlockDriverAIOCB *acb; |
| 2487 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2488 | if (pool->free_aiocb) { |
| 2489 | acb = pool->free_aiocb; |
| 2490 | pool->free_aiocb = acb->next; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2491 | } else { |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2492 | acb = g_malloc0(pool->aiocb_size); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2493 | acb->pool = pool; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2494 | } |
| 2495 | acb->bs = bs; |
| 2496 | acb->cb = cb; |
| 2497 | acb->opaque = opaque; |
| 2498 | return acb; |
| 2499 | } |
| 2500 | |
| 2501 | void qemu_aio_release(void *p) |
| 2502 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2503 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
| 2504 | AIOPool *pool = acb->pool; |
| 2505 | acb->next = pool->free_aiocb; |
| 2506 | pool->free_aiocb = acb; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2507 | } |
| 2508 | |
| 2509 | /**************************************************************/ |
| 2510 | /* removable device support */ |
| 2511 | |
| 2512 | /** |
| 2513 | * Return TRUE if the media is present |
| 2514 | */ |
| 2515 | int bdrv_is_inserted(BlockDriverState *bs) |
| 2516 | { |
| 2517 | BlockDriver *drv = bs->drv; |
| 2518 | int ret; |
| 2519 | if (!drv) |
| 2520 | return 0; |
| 2521 | if (!drv->bdrv_is_inserted) |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2522 | return !bs->tray_open; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2523 | ret = drv->bdrv_is_inserted(bs); |
| 2524 | return ret; |
| 2525 | } |
| 2526 | |
| 2527 | /** |
| 2528 | * Return TRUE if the media changed since the last call to this |
| 2529 | * function. It is currently only used for floppy disks |
| 2530 | */ |
| 2531 | int bdrv_media_changed(BlockDriverState *bs) |
| 2532 | { |
| 2533 | BlockDriver *drv = bs->drv; |
| 2534 | int ret; |
| 2535 | |
| 2536 | if (!drv || !drv->bdrv_media_changed) |
| 2537 | ret = -ENOTSUP; |
| 2538 | else |
| 2539 | ret = drv->bdrv_media_changed(bs); |
| 2540 | if (ret == -ENOTSUP) |
| 2541 | ret = bs->media_changed; |
| 2542 | bs->media_changed = 0; |
| 2543 | return ret; |
| 2544 | } |
| 2545 | |
| 2546 | /** |
| 2547 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 2548 | */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2549 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2550 | { |
| 2551 | BlockDriver *drv = bs->drv; |
| 2552 | int ret; |
| 2553 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2554 | if (bs->locked) { |
| 2555 | return -EBUSY; |
| 2556 | } |
| 2557 | |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2558 | if (!drv || !drv->bdrv_eject) { |
| 2559 | ret = -ENOTSUP; |
| 2560 | } else { |
| 2561 | ret = drv->bdrv_eject(bs, eject_flag); |
| 2562 | } |
| 2563 | if (ret == -ENOTSUP) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2564 | ret = 0; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2565 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2566 | if (ret >= 0) { |
| 2567 | bs->tray_open = eject_flag; |
| 2568 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2569 | |
| 2570 | return ret; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 2571 | } |
| 2572 | |
| 2573 | int bdrv_is_locked(BlockDriverState *bs) |
| 2574 | { |
| 2575 | return bs->locked; |
| 2576 | } |
| 2577 | |
| 2578 | /** |
| 2579 | * Lock or unlock the media (if it is locked, the user won't be able |
| 2580 | * to eject it manually). |
| 2581 | */ |
| 2582 | void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 2583 | { |
| 2584 | BlockDriver *drv = bs->drv; |
| 2585 | |
| 2586 | bs->locked = locked; |
| 2587 | if (drv && drv->bdrv_set_locked) { |
| 2588 | drv->bdrv_set_locked(bs, locked); |
| 2589 | } |
| 2590 | } |
| 2591 | |
| 2592 | /* needed for generic scsi interface */ |
| 2593 | |
| 2594 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 2595 | { |
| 2596 | BlockDriver *drv = bs->drv; |
| 2597 | |
| 2598 | if (drv && drv->bdrv_ioctl) |
| 2599 | return drv->bdrv_ioctl(bs, req, buf); |
| 2600 | return -ENOTSUP; |
| 2601 | } |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2602 | |
| 2603 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 2604 | unsigned long int req, void *buf, |
| 2605 | BlockDriverCompletionFunc *cb, void *opaque) |
| 2606 | { |
| 2607 | BlockDriver *drv = bs->drv; |
| 2608 | |
| 2609 | if (drv && drv->bdrv_aio_ioctl) |
| 2610 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); |
| 2611 | return NULL; |
| 2612 | } |
| 2613 | |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2614 | |
| 2615 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 2616 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
| 2617 | { |
| 2618 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
| 2619 | } |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2620 | |
| 2621 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
| 2622 | { |
| 2623 | int64_t bitmap_size; |
| 2624 | |
| 2625 | bs->dirty_count = 0; |
| 2626 | if (enable) { |
| 2627 | if (!bs->dirty_bitmap) { |
| 2628 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
| 2629 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
| 2630 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; |
| 2631 | |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2632 | bs->dirty_bitmap = g_malloc0(bitmap_size); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2633 | } |
| 2634 | } else { |
| 2635 | if (bs->dirty_bitmap) { |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 2636 | g_free(bs->dirty_bitmap); |
David 'Digit' Turner | cb42a1b | 2010-12-23 02:54:08 +0100 | [diff] [blame] | 2637 | bs->dirty_bitmap = NULL; |
| 2638 | } |
| 2639 | } |
| 2640 | } |
| 2641 | |
| 2642 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) |
| 2643 | { |
| 2644 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 2645 | |
| 2646 | if (bs->dirty_bitmap && |
| 2647 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
| 2648 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
| 2649 | (1 << (chunk % (sizeof(unsigned long) * 8))); |
| 2650 | } else { |
| 2651 | return 0; |
| 2652 | } |
| 2653 | } |
| 2654 | |
| 2655 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
| 2656 | int nr_sectors) |
| 2657 | { |
| 2658 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); |
| 2659 | } |
| 2660 | |
| 2661 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
| 2662 | { |
| 2663 | return bs->dirty_count; |
| 2664 | } |