Annotation of qemu/block.c, revision 1.1.1.18
1.1 root 1: /*
2: * QEMU System Emulator block driver
1.1.1.6 root 3: *
1.1 root 4: * Copyright (c) 2003 Fabrice Bellard
1.1.1.6 root 5: *
1.1 root 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: */
1.1.1.7 root 24: #include "config-host.h"
1.1.1.6 root 25: #include "qemu-common.h"
1.1.1.13 root 26: #include "monitor.h"
1.1 root 27: #include "block_int.h"
1.1.1.13 root 28: #include "module.h"
1.1.1.14 root 29: #include "qemu-objects.h"
1.1 root 30:
1.1.1.14 root 31: #ifdef CONFIG_BSD
1.1 root 32: #include <sys/types.h>
33: #include <sys/stat.h>
34: #include <sys/ioctl.h>
1.1.1.14 root 35: #include <sys/queue.h>
1.1.1.13 root 36: #ifndef __DragonFly__
1.1 root 37: #include <sys/disk.h>
38: #endif
1.1.1.13 root 39: #endif
40:
41: #ifdef _WIN32
42: #include <windows.h>
43: #endif
1.1 root 44:
1.1.1.13 root 45: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
46: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 47: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.13 root 48: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
49: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 50: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.14 root 51: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
52: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.18! root 53: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
! 54: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.6 root 55: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 56: uint8_t *buf, int nb_sectors);
57: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
58: const uint8_t *buf, int nb_sectors);
1.1.1.3 root 59:
1.1.1.18! root 60: static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
! 61: QTAILQ_HEAD_INITIALIZER(bdrv_states);
1.1.1.7 root 62:
1.1.1.18! root 63: static QLIST_HEAD(, BlockDriver) bdrv_drivers =
! 64: QLIST_HEAD_INITIALIZER(bdrv_drivers);
! 65:
! 66: /* The device to use for VM snapshots */
! 67: static BlockDriverState *bs_snapshots;
1.1 root 68:
1.1.1.14 root 69: /* If non-zero, use only whitelisted block drivers */
70: static int use_bdrv_whitelist;
71:
1.1.1.5 root 72: int path_is_absolute(const char *path)
73: {
74: const char *p;
75: #ifdef _WIN32
76: /* specific case for names like: "\\.\d:" */
77: if (*path == '/' || *path == '\\')
78: return 1;
79: #endif
80: p = strchr(path, ':');
81: if (p)
82: p++;
83: else
84: p = path;
85: #ifdef _WIN32
86: return (*p == '/' || *p == '\\');
87: #else
88: return (*p == '/');
89: #endif
1.1.1.2 root 90: }
91:
1.1.1.5 root 92: /* if filename is absolute, just copy it to dest. Otherwise, build a
93: path to it by considering it is relative to base_path. URL are
94: supported. */
95: void path_combine(char *dest, int dest_size,
96: const char *base_path,
97: const char *filename)
98: {
99: const char *p, *p1;
100: int len;
101:
102: if (dest_size <= 0)
103: return;
104: if (path_is_absolute(filename)) {
105: pstrcpy(dest, dest_size, filename);
106: } else {
107: p = strchr(base_path, ':');
108: if (p)
109: p++;
110: else
111: p = base_path;
112: p1 = strrchr(base_path, '/');
113: #ifdef _WIN32
114: {
115: const char *p2;
116: p2 = strrchr(base_path, '\\');
117: if (!p1 || p2 > p1)
118: p1 = p2;
1.1.1.2 root 119: }
1.1.1.5 root 120: #endif
121: if (p1)
122: p1++;
123: else
124: p1 = base_path;
125: if (p1 > p)
126: p = p1;
127: len = p - base_path;
128: if (len > dest_size - 1)
129: len = dest_size - 1;
130: memcpy(dest, base_path, len);
131: dest[len] = '\0';
132: pstrcat(dest, dest_size, filename);
1.1.1.2 root 133: }
134: }
135:
1.1.1.13 root 136: void bdrv_register(BlockDriver *bdrv)
1.1 root 137: {
1.1.1.13 root 138: if (!bdrv->bdrv_aio_readv) {
1.1.1.5 root 139: /* add AIO emulation layer */
1.1.1.13 root 140: bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
141: bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
142: } else if (!bdrv->bdrv_read) {
1.1.1.5 root 143: /* add synchronous IO emulation layer */
144: bdrv->bdrv_read = bdrv_read_em;
145: bdrv->bdrv_write = bdrv_write_em;
146: }
1.1.1.14 root 147:
148: if (!bdrv->bdrv_aio_flush)
149: bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
150:
1.1.1.18! root 151: QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
1.1 root 152: }
153:
154: /* create a new block device (by default it is empty) */
155: BlockDriverState *bdrv_new(const char *device_name)
156: {
1.1.1.18! root 157: BlockDriverState *bs;
1.1 root 158:
159: bs = qemu_mallocz(sizeof(BlockDriverState));
160: pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
161: if (device_name[0] != '\0') {
1.1.1.18! root 162: QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
1.1 root 163: }
164: return bs;
165: }
166:
167: BlockDriver *bdrv_find_format(const char *format_name)
168: {
169: BlockDriver *drv1;
1.1.1.18! root 170: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
! 171: if (!strcmp(drv1->format_name, format_name)) {
1.1 root 172: return drv1;
1.1.1.18! root 173: }
1.1 root 174: }
175: return NULL;
176: }
177:
1.1.1.14 root 178: static int bdrv_is_whitelisted(BlockDriver *drv)
179: {
180: static const char *whitelist[] = {
181: CONFIG_BDRV_WHITELIST
182: };
183: const char **p;
184:
185: if (!whitelist[0])
186: return 1; /* no whitelist, anything goes */
187:
188: for (p = whitelist; *p; p++) {
189: if (!strcmp(drv->format_name, *p)) {
190: return 1;
191: }
192: }
193: return 0;
194: }
195:
196: BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
197: {
198: BlockDriver *drv = bdrv_find_format(format_name);
199: return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
200: }
201:
1.1.1.13 root 202: int bdrv_create(BlockDriver *drv, const char* filename,
203: QEMUOptionParameter *options)
1.1 root 204: {
205: if (!drv->bdrv_create)
206: return -ENOTSUP;
1.1.1.13 root 207:
208: return drv->bdrv_create(filename, options);
1.1 root 209: }
210:
1.1.1.18! root 211: int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
! 212: {
! 213: BlockDriver *drv;
! 214:
! 215: drv = bdrv_find_protocol(filename);
! 216: if (drv == NULL) {
! 217: drv = bdrv_find_format("file");
! 218: }
! 219:
! 220: return bdrv_create(drv, filename, options);
! 221: }
! 222:
1.1 root 223: #ifdef _WIN32
1.1.1.2 root 224: void get_tmp_filename(char *filename, int size)
1.1 root 225: {
1.1.1.5 root 226: char temp_dir[MAX_PATH];
1.1.1.6 root 227:
1.1.1.5 root 228: GetTempPath(MAX_PATH, temp_dir);
229: GetTempFileName(temp_dir, "qem", 0, filename);
1.1 root 230: }
231: #else
1.1.1.2 root 232: void get_tmp_filename(char *filename, int size)
1.1 root 233: {
234: int fd;
1.1.1.7 root 235: const char *tmpdir;
1.1 root 236: /* XXX: race condition possible */
1.1.1.7 root 237: tmpdir = getenv("TMPDIR");
238: if (!tmpdir)
239: tmpdir = "/tmp";
240: snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
1.1 root 241: fd = mkstemp(filename);
242: close(fd);
243: }
244: #endif
245:
1.1.1.5 root 246: #ifdef _WIN32
247: static int is_windows_drive_prefix(const char *filename)
248: {
249: return (((filename[0] >= 'a' && filename[0] <= 'z') ||
250: (filename[0] >= 'A' && filename[0] <= 'Z')) &&
251: filename[1] == ':');
252: }
1.1.1.6 root 253:
1.1.1.13 root 254: int is_windows_drive(const char *filename)
1.1.1.5 root 255: {
1.1.1.6 root 256: if (is_windows_drive_prefix(filename) &&
1.1.1.5 root 257: filename[2] == '\0')
258: return 1;
259: if (strstart(filename, "\\\\.\\", NULL) ||
260: strstart(filename, "//./", NULL))
261: return 1;
262: return 0;
263: }
264: #endif
265:
1.1.1.13 root 266: /*
267: * Detect host devices. By convention, /dev/cdrom[N] is always
268: * recognized as a host CDROM.
269: */
270: static BlockDriver *find_hdev_driver(const char *filename)
271: {
272: int score_max = 0, score;
273: BlockDriver *drv = NULL, *d;
274:
1.1.1.18! root 275: QLIST_FOREACH(d, &bdrv_drivers, list) {
1.1.1.13 root 276: if (d->bdrv_probe_device) {
277: score = d->bdrv_probe_device(filename);
278: if (score > score_max) {
279: score_max = score;
280: drv = d;
281: }
282: }
283: }
284:
285: return drv;
286: }
287:
1.1.1.18! root 288: BlockDriver *bdrv_find_protocol(const char *filename)
! 289: {
! 290: BlockDriver *drv1;
! 291: char protocol[128];
! 292: int len;
! 293: const char *p;
! 294:
! 295: /* TODO Drivers without bdrv_file_open must be specified explicitly */
! 296:
! 297: /*
! 298: * XXX(hch): we really should not let host device detection
! 299: * override an explicit protocol specification, but moving this
! 300: * later breaks access to device names with colons in them.
! 301: * Thanks to the brain-dead persistent naming schemes on udev-
! 302: * based Linux systems those actually are quite common.
! 303: */
! 304: drv1 = find_hdev_driver(filename);
! 305: if (drv1) {
! 306: return drv1;
! 307: }
! 308:
! 309: #ifdef _WIN32
! 310: if (is_windows_drive(filename) ||
! 311: is_windows_drive_prefix(filename))
! 312: return bdrv_find_format("file");
! 313: #endif
! 314:
! 315: p = strchr(filename, ':');
! 316: if (!p) {
! 317: return bdrv_find_format("file");
! 318: }
! 319: len = p - filename;
! 320: if (len > sizeof(protocol) - 1)
! 321: len = sizeof(protocol) - 1;
! 322: memcpy(protocol, filename, len);
! 323: protocol[len] = '\0';
! 324: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
! 325: if (drv1->protocol_name &&
! 326: !strcmp(drv1->protocol_name, protocol)) {
! 327: return drv1;
! 328: }
! 329: }
! 330: return NULL;
! 331: }
! 332:
! 333: static int find_image_format(const char *filename, BlockDriver **pdrv)
1.1 root 334: {
1.1.1.5 root 335: int ret, score, score_max;
1.1 root 336: BlockDriver *drv1, *drv;
1.1.1.5 root 337: uint8_t buf[2048];
338: BlockDriverState *bs;
1.1.1.6 root 339:
1.1.1.18! root 340: ret = bdrv_file_open(&bs, filename, 0);
! 341: if (ret < 0) {
! 342: *pdrv = NULL;
! 343: return ret;
! 344: }
! 345:
! 346: /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
! 347: if (bs->sg || !bdrv_is_inserted(bs)) {
! 348: bdrv_delete(bs);
! 349: drv = bdrv_find_format("raw");
! 350: if (!drv) {
! 351: ret = -ENOENT;
! 352: }
! 353: *pdrv = drv;
! 354: return ret;
! 355: }
1.1.1.5 root 356:
357: ret = bdrv_pread(bs, 0, buf, sizeof(buf));
358: bdrv_delete(bs);
359: if (ret < 0) {
1.1.1.18! root 360: *pdrv = NULL;
! 361: return ret;
1.1.1.5 root 362: }
363:
1.1 root 364: score_max = 0;
1.1.1.18! root 365: drv = NULL;
! 366: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
1.1.1.5 root 367: if (drv1->bdrv_probe) {
368: score = drv1->bdrv_probe(buf, ret, filename);
369: if (score > score_max) {
370: score_max = score;
371: drv = drv1;
372: }
1.1 root 373: }
374: }
1.1.1.18! root 375: if (!drv) {
! 376: ret = -ENOENT;
! 377: }
! 378: *pdrv = drv;
! 379: return ret;
! 380: }
! 381:
! 382: /**
! 383: * Set the current 'total_sectors' value
! 384: */
! 385: static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
! 386: {
! 387: BlockDriver *drv = bs->drv;
! 388:
! 389: /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
! 390: if (bs->sg)
! 391: return 0;
! 392:
! 393: /* query actual device if possible, otherwise just trust the hint */
! 394: if (drv->bdrv_getlength) {
! 395: int64_t length = drv->bdrv_getlength(bs);
! 396: if (length < 0) {
! 397: return length;
! 398: }
! 399: hint = length >> BDRV_SECTOR_BITS;
! 400: }
! 401:
! 402: bs->total_sectors = hint;
! 403: return 0;
! 404: }
! 405:
! 406: /*
! 407: * Common part for opening disk images and files
! 408: */
! 409: static int bdrv_open_common(BlockDriverState *bs, const char *filename,
! 410: int flags, BlockDriver *drv)
! 411: {
! 412: int ret, open_flags;
! 413:
! 414: assert(drv != NULL);
! 415:
! 416: bs->file = NULL;
! 417: bs->total_sectors = 0;
! 418: bs->encrypted = 0;
! 419: bs->valid_key = 0;
! 420: bs->open_flags = flags;
! 421: /* buffer_alignment defaulted to 512, drivers can change this value */
! 422: bs->buffer_alignment = 512;
! 423:
! 424: pstrcpy(bs->filename, sizeof(bs->filename), filename);
! 425:
! 426: if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
! 427: return -ENOTSUP;
! 428: }
! 429:
! 430: bs->drv = drv;
! 431: bs->opaque = qemu_mallocz(drv->instance_size);
! 432:
! 433: /*
! 434: * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
! 435: * write cache to the guest. We do need the fdatasync to flush
! 436: * out transactions for block allocations, and we maybe have a
! 437: * volatile write cache in our backing device to deal with.
! 438: */
! 439: if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
! 440: bs->enable_write_cache = 1;
! 441:
! 442: /*
! 443: * Clear flags that are internal to the block layer before opening the
! 444: * image.
! 445: */
! 446: open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
! 447:
! 448: /*
! 449: * Snapshots should be writeable.
! 450: */
! 451: if (bs->is_temporary) {
! 452: open_flags |= BDRV_O_RDWR;
! 453: }
! 454:
! 455: /* Open the image, either directly or using a protocol */
! 456: if (drv->bdrv_file_open) {
! 457: ret = drv->bdrv_file_open(bs, filename, open_flags);
! 458: } else {
! 459: ret = bdrv_file_open(&bs->file, filename, open_flags);
! 460: if (ret >= 0) {
! 461: ret = drv->bdrv_open(bs, open_flags);
! 462: }
! 463: }
! 464:
! 465: if (ret < 0) {
! 466: goto free_and_fail;
! 467: }
! 468:
! 469: bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
! 470:
! 471: ret = refresh_total_sectors(bs, bs->total_sectors);
! 472: if (ret < 0) {
! 473: goto free_and_fail;
! 474: }
! 475:
! 476: #ifndef _WIN32
! 477: if (bs->is_temporary) {
! 478: unlink(filename);
! 479: }
! 480: #endif
! 481: return 0;
! 482:
! 483: free_and_fail:
! 484: if (bs->file) {
! 485: bdrv_delete(bs->file);
! 486: bs->file = NULL;
! 487: }
! 488: qemu_free(bs->opaque);
! 489: bs->opaque = NULL;
! 490: bs->drv = NULL;
! 491: return ret;
1.1 root 492: }
493:
1.1.1.18! root 494: /*
! 495: * Opens a file using a protocol (file, host_device, nbd, ...)
! 496: */
1.1.1.5 root 497: int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
1.1 root 498: {
1.1.1.5 root 499: BlockDriverState *bs;
1.1.1.18! root 500: BlockDriver *drv;
1.1.1.5 root 501: int ret;
502:
1.1.1.18! root 503: drv = bdrv_find_protocol(filename);
! 504: if (!drv) {
! 505: return -ENOENT;
! 506: }
! 507:
1.1.1.5 root 508: bs = bdrv_new("");
1.1.1.18! root 509: ret = bdrv_open_common(bs, filename, flags, drv);
1.1.1.5 root 510: if (ret < 0) {
511: bdrv_delete(bs);
512: return ret;
1.1.1.2 root 513: }
1.1.1.7 root 514: bs->growable = 1;
1.1.1.5 root 515: *pbs = bs;
516: return 0;
517: }
518:
1.1.1.18! root 519: /*
! 520: * Opens a disk image (raw, qcow2, vmdk, ...)
! 521: */
! 522: int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
! 523: BlockDriver *drv)
1.1 root 524: {
1.1.1.18! root 525: int ret;
1.1 root 526:
1.1.1.5 root 527: if (flags & BDRV_O_SNAPSHOT) {
1.1 root 528: BlockDriverState *bs1;
529: int64_t total_size;
1.1.1.7 root 530: int is_protocol = 0;
1.1.1.13 root 531: BlockDriver *bdrv_qcow2;
532: QEMUOptionParameter *options;
1.1.1.18! root 533: char tmp_filename[PATH_MAX];
! 534: char backing_filename[PATH_MAX];
1.1.1.6 root 535:
1.1 root 536: /* if snapshot, we create a temporary backing file and open it
537: instead of opening 'filename' directly */
538:
539: /* if there is a backing file, use it */
540: bs1 = bdrv_new("");
1.1.1.18! root 541: ret = bdrv_open(bs1, filename, 0, drv);
1.1.1.8 root 542: if (ret < 0) {
1.1 root 543: bdrv_delete(bs1);
1.1.1.8 root 544: return ret;
1.1 root 545: }
1.1.1.18! root 546: total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
1.1.1.7 root 547:
548: if (bs1->drv && bs1->drv->protocol_name)
549: is_protocol = 1;
550:
1.1 root 551: bdrv_delete(bs1);
1.1.1.6 root 552:
1.1 root 553: get_tmp_filename(tmp_filename, sizeof(tmp_filename));
1.1.1.7 root 554:
555: /* Real path is meaningless for protocols */
556: if (is_protocol)
557: snprintf(backing_filename, sizeof(backing_filename),
558: "%s", filename);
1.1.1.18! root 559: else if (!realpath(filename, backing_filename))
! 560: return -errno;
1.1.1.7 root 561:
1.1.1.13 root 562: bdrv_qcow2 = bdrv_find_format("qcow2");
563: options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
564:
1.1.1.18! root 565: set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
1.1.1.13 root 566: set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
567: if (drv) {
568: set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
569: drv->format_name);
570: }
571:
572: ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
1.1.1.18! root 573: free_option_parameters(options);
1.1.1.8 root 574: if (ret < 0) {
575: return ret;
1.1 root 576: }
1.1.1.13 root 577:
1.1 root 578: filename = tmp_filename;
1.1.1.13 root 579: drv = bdrv_qcow2;
1.1 root 580: bs->is_temporary = 1;
581: }
582:
1.1.1.18! root 583: /* Find the right image format driver */
! 584: if (!drv) {
! 585: ret = find_image_format(filename, &drv);
1.1.1.8 root 586: }
1.1.1.18! root 587:
1.1.1.8 root 588: if (!drv) {
589: goto unlink_and_fail;
1.1 root 590: }
1.1.1.14 root 591:
1.1.1.18! root 592: /* Open the image */
! 593: ret = bdrv_open_common(bs, filename, flags, drv);
1.1 root 594: if (ret < 0) {
1.1.1.18! root 595: goto unlink_and_fail;
1.1 root 596: }
1.1.1.18! root 597:
! 598: /* If there is a backing file, use it */
! 599: if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
! 600: char backing_filename[PATH_MAX];
! 601: int back_flags;
1.1.1.13 root 602: BlockDriver *back_drv = NULL;
1.1.1.18! root 603:
1.1 root 604: bs->backing_hd = bdrv_new("");
1.1.1.5 root 605: path_combine(backing_filename, sizeof(backing_filename),
606: filename, bs->backing_file);
1.1.1.13 root 607: if (bs->backing_format[0] != '\0')
608: back_drv = bdrv_find_format(bs->backing_format);
1.1.1.18! root 609:
! 610: /* backing files always opened read-only */
! 611: back_flags =
! 612: flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
! 613:
! 614: ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
1.1.1.8 root 615: if (ret < 0) {
616: bdrv_close(bs);
617: return ret;
618: }
1.1.1.18! root 619: if (bs->is_temporary) {
! 620: bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
! 621: } else {
! 622: /* base image inherits from "parent" */
! 623: bs->backing_hd->keep_read_only = bs->keep_read_only;
! 624: }
1.1 root 625: }
626:
1.1.1.13 root 627: if (!bdrv_key_required(bs)) {
628: /* call the change callback */
629: bs->media_changed = 1;
630: if (bs->change_cb)
631: bs->change_cb(bs->change_opaque);
632: }
1.1.1.18! root 633:
1.1 root 634: return 0;
1.1.1.18! root 635:
! 636: unlink_and_fail:
! 637: if (bs->is_temporary) {
! 638: unlink(filename);
! 639: }
! 640: return ret;
1.1 root 641: }
642:
643: void bdrv_close(BlockDriverState *bs)
644: {
1.1.1.5 root 645: if (bs->drv) {
1.1.1.18! root 646: if (bs == bs_snapshots) {
! 647: bs_snapshots = NULL;
! 648: }
! 649: if (bs->backing_hd) {
1.1 root 650: bdrv_delete(bs->backing_hd);
1.1.1.18! root 651: bs->backing_hd = NULL;
! 652: }
1.1 root 653: bs->drv->bdrv_close(bs);
654: qemu_free(bs->opaque);
655: #ifdef _WIN32
656: if (bs->is_temporary) {
657: unlink(bs->filename);
658: }
659: #endif
660: bs->opaque = NULL;
661: bs->drv = NULL;
662:
1.1.1.18! root 663: if (bs->file != NULL) {
! 664: bdrv_close(bs->file);
! 665: }
! 666:
1.1 root 667: /* call the change callback */
1.1.1.5 root 668: bs->media_changed = 1;
1.1 root 669: if (bs->change_cb)
670: bs->change_cb(bs->change_opaque);
671: }
672: }
673:
1.1.1.18! root 674: void bdrv_close_all(void)
! 675: {
! 676: BlockDriverState *bs;
! 677:
! 678: QTAILQ_FOREACH(bs, &bdrv_states, list) {
! 679: bdrv_close(bs);
! 680: }
! 681: }
! 682:
1.1 root 683: void bdrv_delete(BlockDriverState *bs)
684: {
1.1.1.18! root 685: assert(!bs->peer);
1.1.1.7 root 686:
1.1.1.18! root 687: /* remove from list, if necessary */
! 688: if (bs->device_name[0] != '\0') {
! 689: QTAILQ_REMOVE(&bdrv_states, bs, list);
! 690: }
1.1.1.7 root 691:
1.1 root 692: bdrv_close(bs);
1.1.1.18! root 693: if (bs->file != NULL) {
! 694: bdrv_delete(bs->file);
! 695: }
! 696:
! 697: assert(bs != bs_snapshots);
1.1 root 698: qemu_free(bs);
699: }
700:
1.1.1.18! root 701: int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
! 702: {
! 703: if (bs->peer) {
! 704: return -EBUSY;
! 705: }
! 706: bs->peer = qdev;
! 707: return 0;
! 708: }
! 709:
! 710: void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
! 711: {
! 712: assert(bs->peer == qdev);
! 713: bs->peer = NULL;
! 714: }
! 715:
! 716: DeviceState *bdrv_get_attached(BlockDriverState *bs)
! 717: {
! 718: return bs->peer;
! 719: }
! 720:
1.1.1.13 root 721: /*
722: * Run consistency checks on an image
723: *
1.1.1.18! root 724: * Returns 0 if the check could be completed (it doesn't mean that the image is
! 725: * free of errors) or -errno when an internal error occured. The results of the
! 726: * check are stored in res.
1.1.1.13 root 727: */
1.1.1.18! root 728: int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1.1.13 root 729: {
730: if (bs->drv->bdrv_check == NULL) {
731: return -ENOTSUP;
732: }
733:
1.1.1.18! root 734: memset(res, 0, sizeof(*res));
! 735: return bs->drv->bdrv_check(bs, res);
1.1.1.13 root 736: }
737:
1.1 root 738: /* commit COW file into the raw image */
739: int bdrv_commit(BlockDriverState *bs)
740: {
1.1.1.5 root 741: BlockDriver *drv = bs->drv;
1.1.1.18! root 742: BlockDriver *backing_drv;
1.1.1.5 root 743: int64_t i, total_sectors;
1.1.1.18! root 744: int n, j, ro, open_flags;
! 745: int ret = 0, rw_ret = 0;
! 746: unsigned char sector[BDRV_SECTOR_SIZE];
! 747: char filename[1024];
! 748: BlockDriverState *bs_rw, *bs_ro;
1.1 root 749:
1.1.1.5 root 750: if (!drv)
751: return -ENOMEDIUM;
1.1.1.18! root 752:
! 753: if (!bs->backing_hd) {
! 754: return -ENOTSUP;
! 755: }
1.1 root 756:
1.1.1.18! root 757: if (bs->backing_hd->keep_read_only) {
! 758: return -EACCES;
1.1 root 759: }
760:
1.1.1.18! root 761: backing_drv = bs->backing_hd->drv;
! 762: ro = bs->backing_hd->read_only;
! 763: strncpy(filename, bs->backing_hd->filename, sizeof(filename));
! 764: open_flags = bs->backing_hd->open_flags;
! 765:
! 766: if (ro) {
! 767: /* re-open as RW */
! 768: bdrv_delete(bs->backing_hd);
! 769: bs->backing_hd = NULL;
! 770: bs_rw = bdrv_new("");
! 771: rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
! 772: backing_drv);
! 773: if (rw_ret < 0) {
! 774: bdrv_delete(bs_rw);
! 775: /* try to re-open read-only */
! 776: bs_ro = bdrv_new("");
! 777: ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
! 778: backing_drv);
! 779: if (ret < 0) {
! 780: bdrv_delete(bs_ro);
! 781: /* drive not functional anymore */
! 782: bs->drv = NULL;
! 783: return ret;
! 784: }
! 785: bs->backing_hd = bs_ro;
! 786: return rw_ret;
! 787: }
! 788: bs->backing_hd = bs_rw;
1.1 root 789: }
790:
1.1.1.14 root 791: total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1.1.5 root 792: for (i = 0; i < total_sectors;) {
793: if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
1.1 root 794: for(j = 0; j < n; j++) {
795: if (bdrv_read(bs, i, sector, 1) != 0) {
1.1.1.18! root 796: ret = -EIO;
! 797: goto ro_cleanup;
1.1 root 798: }
799:
800: if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
1.1.1.18! root 801: ret = -EIO;
! 802: goto ro_cleanup;
1.1 root 803: }
804: i++;
805: }
806: } else {
807: i += n;
808: }
809: }
1.1.1.2 root 810:
1.1.1.18! root 811: if (drv->bdrv_make_empty) {
! 812: ret = drv->bdrv_make_empty(bs);
! 813: bdrv_flush(bs);
! 814: }
1.1.1.2 root 815:
1.1.1.18! root 816: /*
! 817: * Make sure all data we wrote to the backing device is actually
! 818: * stable on disk.
! 819: */
! 820: if (bs->backing_hd)
! 821: bdrv_flush(bs->backing_hd);
! 822:
! 823: ro_cleanup:
! 824:
! 825: if (ro) {
! 826: /* re-open as RO */
! 827: bdrv_delete(bs->backing_hd);
! 828: bs->backing_hd = NULL;
! 829: bs_ro = bdrv_new("");
! 830: ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
! 831: backing_drv);
! 832: if (ret < 0) {
! 833: bdrv_delete(bs_ro);
! 834: /* drive not functional anymore */
! 835: bs->drv = NULL;
! 836: return ret;
! 837: }
! 838: bs->backing_hd = bs_ro;
! 839: bs->backing_hd->keep_read_only = 0;
! 840: }
! 841:
! 842: return ret;
! 843: }
! 844:
! 845: void bdrv_commit_all(void)
! 846: {
! 847: BlockDriverState *bs;
! 848:
! 849: QTAILQ_FOREACH(bs, &bdrv_states, list) {
! 850: bdrv_commit(bs);
! 851: }
! 852: }
! 853:
! 854: /*
! 855: * Return values:
! 856: * 0 - success
! 857: * -EINVAL - backing format specified, but no file
! 858: * -ENOSPC - can't update the backing file because no space is left in the
! 859: * image file header
! 860: * -ENOTSUP - format driver doesn't support changing the backing file
! 861: */
! 862: int bdrv_change_backing_file(BlockDriverState *bs,
! 863: const char *backing_file, const char *backing_fmt)
! 864: {
! 865: BlockDriver *drv = bs->drv;
! 866:
! 867: if (drv->bdrv_change_backing_file != NULL) {
! 868: return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
! 869: } else {
! 870: return -ENOTSUP;
! 871: }
1.1 root 872: }
873:
1.1.1.7 root 874: static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
875: size_t size)
876: {
877: int64_t len;
878:
879: if (!bdrv_is_inserted(bs))
880: return -ENOMEDIUM;
881:
882: if (bs->growable)
883: return 0;
884:
885: len = bdrv_getlength(bs);
886:
1.1.1.11 root 887: if (offset < 0)
888: return -EIO;
889:
890: if ((offset > len) || (len - offset < size))
1.1.1.7 root 891: return -EIO;
892:
893: return 0;
894: }
895:
896: static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
897: int nb_sectors)
898: {
1.1.1.18! root 899: return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
! 900: nb_sectors * BDRV_SECTOR_SIZE);
1.1.1.7 root 901: }
902:
1.1.1.5 root 903: /* return < 0 if error. See bdrv_write() for the return codes */
1.1.1.6 root 904: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
1.1 root 905: uint8_t *buf, int nb_sectors)
906: {
907: BlockDriver *drv = bs->drv;
908:
1.1.1.5 root 909: if (!drv)
910: return -ENOMEDIUM;
1.1.1.7 root 911: if (bdrv_check_request(bs, sector_num, nb_sectors))
912: return -EIO;
1.1 root 913:
1.1.1.13 root 914: return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
1.1 root 915: }
916:
1.1.1.14 root 917: static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
918: int nb_sectors, int dirty)
919: {
920: int64_t start, end;
921: unsigned long val, idx, bit;
922:
923: start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
924: end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
925:
926: for (; start <= end; start++) {
927: idx = start / (sizeof(unsigned long) * 8);
928: bit = start % (sizeof(unsigned long) * 8);
929: val = bs->dirty_bitmap[idx];
930: if (dirty) {
1.1.1.18! root 931: if (!(val & (1 << bit))) {
! 932: bs->dirty_count++;
! 933: val |= 1 << bit;
! 934: }
1.1.1.14 root 935: } else {
1.1.1.18! root 936: if (val & (1 << bit)) {
! 937: bs->dirty_count--;
! 938: val &= ~(1 << bit);
! 939: }
1.1.1.14 root 940: }
941: bs->dirty_bitmap[idx] = val;
942: }
943: }
944:
1.1.1.6 root 945: /* Return < 0 if error. Important errors are:
1.1.1.5 root 946: -EIO generic I/O error (may happen for all errors)
947: -ENOMEDIUM No media inserted.
948: -EINVAL Invalid sector number or nb_sectors
949: -EACCES Trying to write a read-only device
950: */
1.1.1.6 root 951: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
1.1 root 952: const uint8_t *buf, int nb_sectors)
953: {
1.1.1.5 root 954: BlockDriver *drv = bs->drv;
955: if (!bs->drv)
956: return -ENOMEDIUM;
1.1 root 957: if (bs->read_only)
1.1.1.5 root 958: return -EACCES;
1.1.1.7 root 959: if (bdrv_check_request(bs, sector_num, nb_sectors))
960: return -EIO;
961:
1.1.1.14 root 962: if (bs->dirty_bitmap) {
963: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
964: }
965:
1.1.1.18! root 966: if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
! 967: bs->wr_highest_sector = sector_num + nb_sectors - 1;
! 968: }
! 969:
1.1.1.7 root 970: return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
1.1 root 971: }
972:
1.1.1.13 root 973: int bdrv_pread(BlockDriverState *bs, int64_t offset,
974: void *buf, int count1)
1.1.1.5 root 975: {
1.1.1.14 root 976: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 977: int len, nb_sectors, count;
978: int64_t sector_num;
1.1.1.15 root 979: int ret;
1.1.1.5 root 980:
981: count = count1;
982: /* first read to align to sector start */
1.1.1.14 root 983: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 984: if (len > count)
985: len = count;
1.1.1.14 root 986: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 987: if (len > 0) {
1.1.1.15 root 988: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
989: return ret;
1.1.1.14 root 990: memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1.1.1.5 root 991: count -= len;
992: if (count == 0)
993: return count1;
994: sector_num++;
995: buf += len;
996: }
997:
998: /* read the sectors "in place" */
1.1.1.14 root 999: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 1000: if (nb_sectors > 0) {
1.1.1.15 root 1001: if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
1002: return ret;
1.1.1.5 root 1003: sector_num += nb_sectors;
1.1.1.14 root 1004: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 1005: buf += len;
1006: count -= len;
1007: }
1008:
1009: /* add data from the last sector */
1010: if (count > 0) {
1.1.1.15 root 1011: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1012: return ret;
1.1.1.5 root 1013: memcpy(buf, tmp_buf, count);
1014: }
1015: return count1;
1016: }
1017:
1.1.1.13 root 1018: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
1019: const void *buf, int count1)
1.1.1.5 root 1020: {
1.1.1.14 root 1021: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 1022: int len, nb_sectors, count;
1023: int64_t sector_num;
1.1.1.15 root 1024: int ret;
1.1.1.5 root 1025:
1026: count = count1;
1027: /* first write to align to sector start */
1.1.1.14 root 1028: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 1029: if (len > count)
1030: len = count;
1.1.1.14 root 1031: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 1032: if (len > 0) {
1.1.1.15 root 1033: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1034: return ret;
1.1.1.14 root 1035: memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1.1.1.15 root 1036: if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1037: return ret;
1.1.1.5 root 1038: count -= len;
1039: if (count == 0)
1040: return count1;
1041: sector_num++;
1042: buf += len;
1043: }
1044:
1045: /* write the sectors "in place" */
1.1.1.14 root 1046: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 1047: if (nb_sectors > 0) {
1.1.1.15 root 1048: if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
1049: return ret;
1.1.1.5 root 1050: sector_num += nb_sectors;
1.1.1.14 root 1051: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 1052: buf += len;
1053: count -= len;
1054: }
1055:
1056: /* add data from the last sector */
1057: if (count > 0) {
1.1.1.15 root 1058: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1059: return ret;
1.1.1.5 root 1060: memcpy(tmp_buf, buf, count);
1.1.1.15 root 1061: if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1062: return ret;
1.1.1.5 root 1063: }
1064: return count1;
1065: }
1066:
1.1.1.17 root 1067: /*
1068: * Writes to the file and ensures that no writes are reordered across this
1069: * request (acts as a barrier)
1070: *
1071: * Returns 0 on success, -errno in error cases.
1072: */
1073: int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
1074: const void *buf, int count)
1075: {
1076: int ret;
1077:
1078: ret = bdrv_pwrite(bs, offset, buf, count);
1079: if (ret < 0) {
1080: return ret;
1081: }
1082:
1083: /* No flush needed for cache=writethrough, it uses O_DSYNC */
1084: if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
1085: bdrv_flush(bs);
1086: }
1087:
1088: return 0;
1089: }
1090:
1091: /*
1092: * Writes to the file and ensures that no writes are reordered across this
1093: * request (acts as a barrier)
1094: *
1095: * Returns 0 on success, -errno in error cases.
1096: */
1097: int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
1098: const uint8_t *buf, int nb_sectors)
1099: {
1100: return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
1101: buf, BDRV_SECTOR_SIZE * nb_sectors);
1102: }
1103:
1.1.1.5 root 1104: /**
1105: * Truncate file to 'offset' bytes (needed only for file protocols)
1106: */
1107: int bdrv_truncate(BlockDriverState *bs, int64_t offset)
1108: {
1109: BlockDriver *drv = bs->drv;
1.1.1.18! root 1110: int ret;
1.1.1.5 root 1111: if (!drv)
1112: return -ENOMEDIUM;
1113: if (!drv->bdrv_truncate)
1114: return -ENOTSUP;
1.1.1.14 root 1115: if (bs->read_only)
1116: return -EACCES;
1.1.1.18! root 1117: ret = drv->bdrv_truncate(bs, offset);
! 1118: if (ret == 0) {
! 1119: ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
! 1120: }
! 1121: return ret;
1.1.1.5 root 1122: }
1123:
1124: /**
1125: * Length of a file in bytes. Return < 0 if error or unknown.
1126: */
1127: int64_t bdrv_getlength(BlockDriverState *bs)
1128: {
1129: BlockDriver *drv = bs->drv;
1130: if (!drv)
1131: return -ENOMEDIUM;
1.1.1.18! root 1132:
! 1133: /* Fixed size devices use the total_sectors value for speed instead of
! 1134: issuing a length query (like lseek) on each call. Also, legacy block
! 1135: drivers don't provide a bdrv_getlength function and must use
! 1136: total_sectors. */
! 1137: if (!bs->growable || !drv->bdrv_getlength) {
1.1.1.14 root 1138: return bs->total_sectors * BDRV_SECTOR_SIZE;
1.1.1.5 root 1139: }
1140: return drv->bdrv_getlength(bs);
1141: }
1142:
1143: /* return 0 as number of sectors if no device present or error */
1.1.1.6 root 1144: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1.1 root 1145: {
1.1.1.5 root 1146: int64_t length;
1147: length = bdrv_getlength(bs);
1148: if (length < 0)
1149: length = 0;
1150: else
1.1.1.14 root 1151: length = length >> BDRV_SECTOR_BITS;
1.1.1.5 root 1152: *nb_sectors_ptr = length;
1.1 root 1153: }
1154:
1.1.1.7 root 1155: struct partition {
1156: uint8_t boot_ind; /* 0x80 - active */
1157: uint8_t head; /* starting head */
1158: uint8_t sector; /* starting sector */
1159: uint8_t cyl; /* starting cylinder */
1160: uint8_t sys_ind; /* What partition type */
1161: uint8_t end_head; /* end head */
1162: uint8_t end_sector; /* end sector */
1163: uint8_t end_cyl; /* end cylinder */
1164: uint32_t start_sect; /* starting sector counting from 0 */
1165: uint32_t nr_sects; /* nr of sectors in partition */
1166: } __attribute__((packed));
1167:
1168: /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1169: static int guess_disk_lchs(BlockDriverState *bs,
1170: int *pcylinders, int *pheads, int *psectors)
1171: {
1.1.1.18! root 1172: uint8_t buf[BDRV_SECTOR_SIZE];
1.1.1.7 root 1173: int ret, i, heads, sectors, cylinders;
1174: struct partition *p;
1175: uint32_t nr_sects;
1176: uint64_t nb_sectors;
1177:
1178: bdrv_get_geometry(bs, &nb_sectors);
1179:
1180: ret = bdrv_read(bs, 0, buf, 1);
1181: if (ret < 0)
1182: return -1;
1183: /* test msdos magic */
1184: if (buf[510] != 0x55 || buf[511] != 0xaa)
1185: return -1;
1186: for(i = 0; i < 4; i++) {
1187: p = ((struct partition *)(buf + 0x1be)) + i;
1188: nr_sects = le32_to_cpu(p->nr_sects);
1189: if (nr_sects && p->end_head) {
1190: /* We make the assumption that the partition terminates on
1191: a cylinder boundary */
1192: heads = p->end_head + 1;
1193: sectors = p->end_sector & 63;
1194: if (sectors == 0)
1195: continue;
1196: cylinders = nb_sectors / (heads * sectors);
1197: if (cylinders < 1 || cylinders > 16383)
1198: continue;
1199: *pheads = heads;
1200: *psectors = sectors;
1201: *pcylinders = cylinders;
1202: #if 0
1203: printf("guessed geometry: LCHS=%d %d %d\n",
1204: cylinders, heads, sectors);
1205: #endif
1206: return 0;
1207: }
1208: }
1209: return -1;
1210: }
1211:
1212: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1.1 root 1213: {
1.1.1.7 root 1214: int translation, lba_detected = 0;
1215: int cylinders, heads, secs;
1216: uint64_t nb_sectors;
1217:
1218: /* if a geometry hint is available, use it */
1219: bdrv_get_geometry(bs, &nb_sectors);
1220: bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1221: translation = bdrv_get_translation_hint(bs);
1222: if (cylinders != 0) {
1223: *pcyls = cylinders;
1224: *pheads = heads;
1225: *psecs = secs;
1226: } else {
1227: if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1228: if (heads > 16) {
1229: /* if heads > 16, it means that a BIOS LBA
1230: translation was active, so the default
1231: hardware geometry is OK */
1232: lba_detected = 1;
1233: goto default_geometry;
1234: } else {
1235: *pcyls = cylinders;
1236: *pheads = heads;
1237: *psecs = secs;
1238: /* disable any translation to be in sync with
1239: the logical geometry */
1240: if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1241: bdrv_set_translation_hint(bs,
1242: BIOS_ATA_TRANSLATION_NONE);
1243: }
1244: }
1245: } else {
1246: default_geometry:
1247: /* if no geometry, use a standard physical disk geometry */
1248: cylinders = nb_sectors / (16 * 63);
1249:
1250: if (cylinders > 16383)
1251: cylinders = 16383;
1252: else if (cylinders < 2)
1253: cylinders = 2;
1254: *pcyls = cylinders;
1255: *pheads = 16;
1256: *psecs = 63;
1257: if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1258: if ((*pcyls * *pheads) <= 131072) {
1259: bdrv_set_translation_hint(bs,
1260: BIOS_ATA_TRANSLATION_LARGE);
1261: } else {
1262: bdrv_set_translation_hint(bs,
1263: BIOS_ATA_TRANSLATION_LBA);
1264: }
1265: }
1266: }
1267: bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1268: }
1.1 root 1269: }
1270:
1.1.1.6 root 1271: void bdrv_set_geometry_hint(BlockDriverState *bs,
1.1 root 1272: int cyls, int heads, int secs)
1273: {
1274: bs->cyls = cyls;
1275: bs->heads = heads;
1276: bs->secs = secs;
1277: }
1278:
1279: void bdrv_set_type_hint(BlockDriverState *bs, int type)
1280: {
1281: bs->type = type;
1282: bs->removable = ((type == BDRV_TYPE_CDROM ||
1283: type == BDRV_TYPE_FLOPPY));
1284: }
1285:
1286: void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1287: {
1288: bs->translation = translation;
1289: }
1290:
1.1.1.6 root 1291: void bdrv_get_geometry_hint(BlockDriverState *bs,
1.1 root 1292: int *pcyls, int *pheads, int *psecs)
1293: {
1294: *pcyls = bs->cyls;
1295: *pheads = bs->heads;
1296: *psecs = bs->secs;
1297: }
1298:
1299: int bdrv_get_type_hint(BlockDriverState *bs)
1300: {
1301: return bs->type;
1302: }
1303:
1304: int bdrv_get_translation_hint(BlockDriverState *bs)
1305: {
1306: return bs->translation;
1307: }
1308:
1.1.1.18! root 1309: void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
! 1310: BlockErrorAction on_write_error)
! 1311: {
! 1312: bs->on_read_error = on_read_error;
! 1313: bs->on_write_error = on_write_error;
! 1314: }
! 1315:
! 1316: BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
! 1317: {
! 1318: return is_read ? bs->on_read_error : bs->on_write_error;
! 1319: }
! 1320:
! 1321: void bdrv_set_removable(BlockDriverState *bs, int removable)
! 1322: {
! 1323: bs->removable = removable;
! 1324: if (removable && bs == bs_snapshots) {
! 1325: bs_snapshots = NULL;
! 1326: }
! 1327: }
! 1328:
1.1 root 1329: int bdrv_is_removable(BlockDriverState *bs)
1330: {
1331: return bs->removable;
1332: }
1333:
1334: int bdrv_is_read_only(BlockDriverState *bs)
1335: {
1336: return bs->read_only;
1337: }
1338:
1.1.1.6 root 1339: int bdrv_is_sg(BlockDriverState *bs)
1340: {
1341: return bs->sg;
1342: }
1343:
1.1.1.14 root 1344: int bdrv_enable_write_cache(BlockDriverState *bs)
1345: {
1346: return bs->enable_write_cache;
1347: }
1348:
1.1.1.5 root 1349: /* XXX: no longer used */
1.1.1.6 root 1350: void bdrv_set_change_cb(BlockDriverState *bs,
1.1 root 1351: void (*change_cb)(void *opaque), void *opaque)
1352: {
1353: bs->change_cb = change_cb;
1354: bs->change_opaque = opaque;
1355: }
1356:
1357: int bdrv_is_encrypted(BlockDriverState *bs)
1358: {
1359: if (bs->backing_hd && bs->backing_hd->encrypted)
1360: return 1;
1361: return bs->encrypted;
1362: }
1363:
1.1.1.8 root 1364: int bdrv_key_required(BlockDriverState *bs)
1365: {
1366: BlockDriverState *backing_hd = bs->backing_hd;
1367:
1368: if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1369: return 1;
1370: return (bs->encrypted && !bs->valid_key);
1371: }
1372:
1.1 root 1373: int bdrv_set_key(BlockDriverState *bs, const char *key)
1374: {
1375: int ret;
1376: if (bs->backing_hd && bs->backing_hd->encrypted) {
1377: ret = bdrv_set_key(bs->backing_hd, key);
1378: if (ret < 0)
1379: return ret;
1380: if (!bs->encrypted)
1381: return 0;
1382: }
1.1.1.18! root 1383: if (!bs->encrypted) {
! 1384: return -EINVAL;
! 1385: } else if (!bs->drv || !bs->drv->bdrv_set_key) {
! 1386: return -ENOMEDIUM;
! 1387: }
1.1.1.8 root 1388: ret = bs->drv->bdrv_set_key(bs, key);
1.1.1.13 root 1389: if (ret < 0) {
1390: bs->valid_key = 0;
1391: } else if (!bs->valid_key) {
1392: bs->valid_key = 1;
1393: /* call the change callback now, we skipped it on open */
1394: bs->media_changed = 1;
1395: if (bs->change_cb)
1396: bs->change_cb(bs->change_opaque);
1397: }
1.1.1.8 root 1398: return ret;
1.1 root 1399: }
1400:
1401: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1402: {
1.1.1.5 root 1403: if (!bs->drv) {
1.1 root 1404: buf[0] = '\0';
1405: } else {
1406: pstrcpy(buf, buf_size, bs->drv->format_name);
1407: }
1408: }
1409:
1.1.1.6 root 1410: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1.1 root 1411: void *opaque)
1412: {
1413: BlockDriver *drv;
1414:
1.1.1.18! root 1415: QLIST_FOREACH(drv, &bdrv_drivers, list) {
1.1 root 1416: it(opaque, drv->format_name);
1417: }
1418: }
1419:
1420: BlockDriverState *bdrv_find(const char *name)
1421: {
1422: BlockDriverState *bs;
1423:
1.1.1.18! root 1424: QTAILQ_FOREACH(bs, &bdrv_states, list) {
! 1425: if (!strcmp(name, bs->device_name)) {
1.1 root 1426: return bs;
1.1.1.18! root 1427: }
1.1 root 1428: }
1429: return NULL;
1430: }
1431:
1.1.1.18! root 1432: BlockDriverState *bdrv_next(BlockDriverState *bs)
! 1433: {
! 1434: if (!bs) {
! 1435: return QTAILQ_FIRST(&bdrv_states);
! 1436: }
! 1437: return QTAILQ_NEXT(bs, list);
! 1438: }
! 1439:
1.1.1.8 root 1440: void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1.1 root 1441: {
1442: BlockDriverState *bs;
1443:
1.1.1.18! root 1444: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.8 root 1445: it(opaque, bs);
1.1 root 1446: }
1447: }
1448:
1449: const char *bdrv_get_device_name(BlockDriverState *bs)
1450: {
1451: return bs->device_name;
1452: }
1453:
1.1.1.4 root 1454: void bdrv_flush(BlockDriverState *bs)
1455: {
1.1.1.18! root 1456: if (bs->open_flags & BDRV_O_NO_FLUSH) {
1.1.1.13 root 1457: return;
1.1.1.18! root 1458: }
! 1459:
! 1460: if (bs->drv && bs->drv->bdrv_flush)
1.1.1.4 root 1461: bs->drv->bdrv_flush(bs);
1462: }
1463:
1.1.1.7 root 1464: void bdrv_flush_all(void)
1465: {
1466: BlockDriverState *bs;
1467:
1.1.1.18! root 1468: QTAILQ_FOREACH(bs, &bdrv_states, list) {
! 1469: if (bs->drv && !bdrv_is_read_only(bs) &&
! 1470: (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1.1.1.7 root 1471: bdrv_flush(bs);
1.1.1.18! root 1472: }
! 1473: }
! 1474: }
! 1475:
! 1476: int bdrv_has_zero_init(BlockDriverState *bs)
! 1477: {
! 1478: assert(bs->drv);
! 1479:
! 1480: if (bs->drv->bdrv_has_zero_init) {
! 1481: return bs->drv->bdrv_has_zero_init(bs);
! 1482: }
! 1483:
! 1484: return 1;
1.1.1.7 root 1485: }
1486:
1487: /*
1488: * Returns true iff the specified sector is present in the disk image. Drivers
1489: * not implementing the functionality are assumed to not support backing files,
1490: * hence all their sectors are reported as allocated.
1491: *
1492: * 'pnum' is set to the number of sectors (including and immediately following
1493: * the specified sector) that are known to be in the same
1494: * allocated/unallocated state.
1495: *
1496: * 'nb_sectors' is the max value 'pnum' should be set to.
1497: */
1498: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1499: int *pnum)
1500: {
1501: int64_t n;
1502: if (!bs->drv->bdrv_is_allocated) {
1503: if (sector_num >= bs->total_sectors) {
1504: *pnum = 0;
1505: return 0;
1506: }
1507: n = bs->total_sectors - sector_num;
1508: *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1509: return 1;
1510: }
1511: return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1512: }
1513:
1.1.1.18! root 1514: void bdrv_mon_event(const BlockDriverState *bdrv,
! 1515: BlockMonEventAction action, int is_read)
! 1516: {
! 1517: QObject *data;
! 1518: const char *action_str;
! 1519:
! 1520: switch (action) {
! 1521: case BDRV_ACTION_REPORT:
! 1522: action_str = "report";
! 1523: break;
! 1524: case BDRV_ACTION_IGNORE:
! 1525: action_str = "ignore";
! 1526: break;
! 1527: case BDRV_ACTION_STOP:
! 1528: action_str = "stop";
! 1529: break;
! 1530: default:
! 1531: abort();
! 1532: }
! 1533:
! 1534: data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
! 1535: bdrv->device_name,
! 1536: action_str,
! 1537: is_read ? "read" : "write");
! 1538: monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
! 1539:
! 1540: qobject_decref(data);
! 1541: }
! 1542:
1.1.1.14 root 1543: static void bdrv_print_dict(QObject *obj, void *opaque)
1.1 root 1544: {
1.1.1.14 root 1545: QDict *bs_dict;
1546: Monitor *mon = opaque;
1547:
1548: bs_dict = qobject_to_qdict(obj);
1549:
1550: monitor_printf(mon, "%s: type=%s removable=%d",
1551: qdict_get_str(bs_dict, "device"),
1552: qdict_get_str(bs_dict, "type"),
1553: qdict_get_bool(bs_dict, "removable"));
1554:
1555: if (qdict_get_bool(bs_dict, "removable")) {
1556: monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1557: }
1558:
1559: if (qdict_haskey(bs_dict, "inserted")) {
1560: QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1561:
1562: monitor_printf(mon, " file=");
1563: monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1564: if (qdict_haskey(qdict, "backing_file")) {
1565: monitor_printf(mon, " backing_file=");
1566: monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1567: }
1568: monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1569: qdict_get_bool(qdict, "ro"),
1570: qdict_get_str(qdict, "drv"),
1571: qdict_get_bool(qdict, "encrypted"));
1572: } else {
1573: monitor_printf(mon, " [not inserted]");
1574: }
1575:
1576: monitor_printf(mon, "\n");
1577: }
1578:
1579: void bdrv_info_print(Monitor *mon, const QObject *data)
1580: {
1581: qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1582: }
1583:
1584: void bdrv_info(Monitor *mon, QObject **ret_data)
1585: {
1586: QList *bs_list;
1.1 root 1587: BlockDriverState *bs;
1588:
1.1.1.14 root 1589: bs_list = qlist_new();
1590:
1.1.1.18! root 1591: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.14 root 1592: QObject *bs_obj;
1593: const char *type = "unknown";
1594:
1.1 root 1595: switch(bs->type) {
1596: case BDRV_TYPE_HD:
1.1.1.14 root 1597: type = "hd";
1.1 root 1598: break;
1599: case BDRV_TYPE_CDROM:
1.1.1.14 root 1600: type = "cdrom";
1.1 root 1601: break;
1602: case BDRV_TYPE_FLOPPY:
1.1.1.14 root 1603: type = "floppy";
1.1 root 1604: break;
1605: }
1.1.1.14 root 1606:
1607: bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1608: "'removable': %i, 'locked': %i }",
1609: bs->device_name, type, bs->removable,
1610: bs->locked);
1611:
1.1.1.5 root 1612: if (bs->drv) {
1.1.1.14 root 1613: QObject *obj;
1614: QDict *bs_dict = qobject_to_qdict(bs_obj);
1615:
1616: obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1617: "'encrypted': %i }",
1618: bs->filename, bs->read_only,
1619: bs->drv->format_name,
1620: bdrv_is_encrypted(bs));
1.1.1.5 root 1621: if (bs->backing_file[0] != '\0') {
1.1.1.14 root 1622: QDict *qdict = qobject_to_qdict(obj);
1623: qdict_put(qdict, "backing_file",
1624: qstring_from_str(bs->backing_file));
1.1.1.13 root 1625: }
1.1.1.14 root 1626:
1627: qdict_put_obj(bs_dict, "inserted", obj);
1.1 root 1628: }
1.1.1.14 root 1629: qlist_append_obj(bs_list, bs_obj);
1.1 root 1630: }
1.1.1.14 root 1631:
1632: *ret_data = QOBJECT(bs_list);
1633: }
1634:
1635: static void bdrv_stats_iter(QObject *data, void *opaque)
1636: {
1637: QDict *qdict;
1638: Monitor *mon = opaque;
1639:
1640: qdict = qobject_to_qdict(data);
1641: monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1642:
1643: qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1644: monitor_printf(mon, " rd_bytes=%" PRId64
1645: " wr_bytes=%" PRId64
1646: " rd_operations=%" PRId64
1647: " wr_operations=%" PRId64
1648: "\n",
1649: qdict_get_int(qdict, "rd_bytes"),
1650: qdict_get_int(qdict, "wr_bytes"),
1651: qdict_get_int(qdict, "rd_operations"),
1652: qdict_get_int(qdict, "wr_operations"));
1653: }
1654:
1655: void bdrv_stats_print(Monitor *mon, const QObject *data)
1656: {
1657: qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1.1 root 1658: }
1659:
1.1.1.18! root 1660: static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
! 1661: {
! 1662: QObject *res;
! 1663: QDict *dict;
! 1664:
! 1665: res = qobject_from_jsonf("{ 'stats': {"
! 1666: "'rd_bytes': %" PRId64 ","
! 1667: "'wr_bytes': %" PRId64 ","
! 1668: "'rd_operations': %" PRId64 ","
! 1669: "'wr_operations': %" PRId64 ","
! 1670: "'wr_highest_offset': %" PRId64
! 1671: "} }",
! 1672: bs->rd_bytes, bs->wr_bytes,
! 1673: bs->rd_ops, bs->wr_ops,
! 1674: bs->wr_highest_sector *
! 1675: (uint64_t)BDRV_SECTOR_SIZE);
! 1676: dict = qobject_to_qdict(res);
! 1677:
! 1678: if (*bs->device_name) {
! 1679: qdict_put(dict, "device", qstring_from_str(bs->device_name));
! 1680: }
! 1681:
! 1682: if (bs->file) {
! 1683: QObject *parent = bdrv_info_stats_bs(bs->file);
! 1684: qdict_put_obj(dict, "parent", parent);
! 1685: }
! 1686:
! 1687: return res;
! 1688: }
! 1689:
1.1.1.14 root 1690: void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1.1.1.6 root 1691: {
1.1.1.14 root 1692: QObject *obj;
1693: QList *devices;
1.1.1.6 root 1694: BlockDriverState *bs;
1695:
1.1.1.14 root 1696: devices = qlist_new();
1697:
1.1.1.18! root 1698: QTAILQ_FOREACH(bs, &bdrv_states, list) {
! 1699: obj = bdrv_info_stats_bs(bs);
1.1.1.14 root 1700: qlist_append_obj(devices, obj);
1.1.1.6 root 1701: }
1.1.1.14 root 1702:
1703: *ret_data = QOBJECT(devices);
1.1.1.6 root 1704: }
1705:
1.1.1.8 root 1706: const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1707: {
1708: if (bs->backing_hd && bs->backing_hd->encrypted)
1709: return bs->backing_file;
1710: else if (bs->encrypted)
1711: return bs->filename;
1712: else
1713: return NULL;
1714: }
1715:
1.1.1.6 root 1716: void bdrv_get_backing_filename(BlockDriverState *bs,
1.1.1.5 root 1717: char *filename, int filename_size)
1718: {
1.1.1.18! root 1719: if (!bs->backing_file) {
1.1.1.5 root 1720: pstrcpy(filename, filename_size, "");
1721: } else {
1722: pstrcpy(filename, filename_size, bs->backing_file);
1723: }
1724: }
1725:
1.1.1.6 root 1726: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 1727: const uint8_t *buf, int nb_sectors)
1728: {
1729: BlockDriver *drv = bs->drv;
1730: if (!drv)
1731: return -ENOMEDIUM;
1732: if (!drv->bdrv_write_compressed)
1733: return -ENOTSUP;
1.1.1.11 root 1734: if (bdrv_check_request(bs, sector_num, nb_sectors))
1735: return -EIO;
1.1.1.14 root 1736:
1737: if (bs->dirty_bitmap) {
1738: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1739: }
1740:
1.1.1.5 root 1741: return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1742: }
1.1.1.6 root 1743:
1.1.1.5 root 1744: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1745: {
1746: BlockDriver *drv = bs->drv;
1747: if (!drv)
1748: return -ENOMEDIUM;
1749: if (!drv->bdrv_get_info)
1750: return -ENOTSUP;
1751: memset(bdi, 0, sizeof(*bdi));
1752: return drv->bdrv_get_info(bs, bdi);
1753: }
1754:
1.1.1.13 root 1755: int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1756: int64_t pos, int size)
1.1.1.9 root 1757: {
1758: BlockDriver *drv = bs->drv;
1759: if (!drv)
1760: return -ENOMEDIUM;
1.1.1.18! root 1761: if (drv->bdrv_save_vmstate)
! 1762: return drv->bdrv_save_vmstate(bs, buf, pos, size);
! 1763: if (bs->file)
! 1764: return bdrv_save_vmstate(bs->file, buf, pos, size);
! 1765: return -ENOTSUP;
1.1.1.9 root 1766: }
1767:
1.1.1.13 root 1768: int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1769: int64_t pos, int size)
1.1.1.9 root 1770: {
1771: BlockDriver *drv = bs->drv;
1772: if (!drv)
1773: return -ENOMEDIUM;
1.1.1.18! root 1774: if (drv->bdrv_load_vmstate)
! 1775: return drv->bdrv_load_vmstate(bs, buf, pos, size);
! 1776: if (bs->file)
! 1777: return bdrv_load_vmstate(bs->file, buf, pos, size);
! 1778: return -ENOTSUP;
! 1779: }
! 1780:
! 1781: void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
! 1782: {
! 1783: BlockDriver *drv = bs->drv;
! 1784:
! 1785: if (!drv || !drv->bdrv_debug_event) {
! 1786: return;
! 1787: }
! 1788:
! 1789: return drv->bdrv_debug_event(bs, event);
! 1790:
1.1.1.9 root 1791: }
1792:
1.1 root 1793: /**************************************************************/
1.1.1.5 root 1794: /* handling of snapshots */
1.1 root 1795:
1.1.1.18! root 1796: int bdrv_can_snapshot(BlockDriverState *bs)
! 1797: {
! 1798: BlockDriver *drv = bs->drv;
! 1799: if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
! 1800: return 0;
! 1801: }
! 1802:
! 1803: if (!drv->bdrv_snapshot_create) {
! 1804: if (bs->file != NULL) {
! 1805: return bdrv_can_snapshot(bs->file);
! 1806: }
! 1807: return 0;
! 1808: }
! 1809:
! 1810: return 1;
! 1811: }
! 1812:
! 1813: int bdrv_is_snapshot(BlockDriverState *bs)
! 1814: {
! 1815: return !!(bs->open_flags & BDRV_O_SNAPSHOT);
! 1816: }
! 1817:
! 1818: BlockDriverState *bdrv_snapshots(void)
! 1819: {
! 1820: BlockDriverState *bs;
! 1821:
! 1822: if (bs_snapshots) {
! 1823: return bs_snapshots;
! 1824: }
! 1825:
! 1826: bs = NULL;
! 1827: while ((bs = bdrv_next(bs))) {
! 1828: if (bdrv_can_snapshot(bs)) {
! 1829: bs_snapshots = bs;
! 1830: return bs;
! 1831: }
! 1832: }
! 1833: return NULL;
! 1834: }
! 1835:
1.1.1.6 root 1836: int bdrv_snapshot_create(BlockDriverState *bs,
1.1.1.5 root 1837: QEMUSnapshotInfo *sn_info)
1838: {
1839: BlockDriver *drv = bs->drv;
1840: if (!drv)
1841: return -ENOMEDIUM;
1.1.1.18! root 1842: if (drv->bdrv_snapshot_create)
! 1843: return drv->bdrv_snapshot_create(bs, sn_info);
! 1844: if (bs->file)
! 1845: return bdrv_snapshot_create(bs->file, sn_info);
! 1846: return -ENOTSUP;
1.1.1.5 root 1847: }
1.1 root 1848:
1.1.1.6 root 1849: int bdrv_snapshot_goto(BlockDriverState *bs,
1.1.1.5 root 1850: const char *snapshot_id)
1.1 root 1851: {
1.1.1.5 root 1852: BlockDriver *drv = bs->drv;
1.1.1.18! root 1853: int ret, open_ret;
! 1854:
1.1.1.5 root 1855: if (!drv)
1856: return -ENOMEDIUM;
1.1.1.18! root 1857: if (drv->bdrv_snapshot_goto)
! 1858: return drv->bdrv_snapshot_goto(bs, snapshot_id);
! 1859:
! 1860: if (bs->file) {
! 1861: drv->bdrv_close(bs);
! 1862: ret = bdrv_snapshot_goto(bs->file, snapshot_id);
! 1863: open_ret = drv->bdrv_open(bs, bs->open_flags);
! 1864: if (open_ret < 0) {
! 1865: bdrv_delete(bs->file);
! 1866: bs->drv = NULL;
! 1867: return open_ret;
! 1868: }
! 1869: return ret;
! 1870: }
! 1871:
! 1872: return -ENOTSUP;
1.1 root 1873: }
1874:
1.1.1.5 root 1875: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1.1 root 1876: {
1.1.1.5 root 1877: BlockDriver *drv = bs->drv;
1878: if (!drv)
1879: return -ENOMEDIUM;
1.1.1.18! root 1880: if (drv->bdrv_snapshot_delete)
! 1881: return drv->bdrv_snapshot_delete(bs, snapshot_id);
! 1882: if (bs->file)
! 1883: return bdrv_snapshot_delete(bs->file, snapshot_id);
! 1884: return -ENOTSUP;
1.1.1.5 root 1885: }
1.1 root 1886:
1.1.1.6 root 1887: int bdrv_snapshot_list(BlockDriverState *bs,
1.1.1.5 root 1888: QEMUSnapshotInfo **psn_info)
1889: {
1890: BlockDriver *drv = bs->drv;
1891: if (!drv)
1892: return -ENOMEDIUM;
1.1.1.18! root 1893: if (drv->bdrv_snapshot_list)
! 1894: return drv->bdrv_snapshot_list(bs, psn_info);
! 1895: if (bs->file)
! 1896: return bdrv_snapshot_list(bs->file, psn_info);
! 1897: return -ENOTSUP;
1.1.1.5 root 1898: }
1899:
1900: #define NB_SUFFIXES 4
1901:
1902: char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1903: {
1904: static const char suffixes[NB_SUFFIXES] = "KMGT";
1905: int64_t base;
1906: int i;
1907:
1908: if (size <= 999) {
1909: snprintf(buf, buf_size, "%" PRId64, size);
1910: } else {
1911: base = 1024;
1912: for(i = 0; i < NB_SUFFIXES; i++) {
1913: if (size < (10 * base)) {
1.1.1.6 root 1914: snprintf(buf, buf_size, "%0.1f%c",
1.1.1.5 root 1915: (double)size / base,
1916: suffixes[i]);
1917: break;
1918: } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1.1.1.6 root 1919: snprintf(buf, buf_size, "%" PRId64 "%c",
1.1.1.5 root 1920: ((size + (base >> 1)) / base),
1921: suffixes[i]);
1922: break;
1923: }
1924: base = base * 1024;
1925: }
1.1 root 1926: }
1.1.1.5 root 1927: return buf;
1928: }
1929:
1930: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1931: {
1932: char buf1[128], date_buf[128], clock_buf[128];
1933: #ifdef _WIN32
1934: struct tm *ptm;
1.1.1.2 root 1935: #else
1.1.1.5 root 1936: struct tm tm;
1.1.1.2 root 1937: #endif
1.1.1.5 root 1938: time_t ti;
1939: int64_t secs;
1940:
1941: if (!sn) {
1.1.1.6 root 1942: snprintf(buf, buf_size,
1943: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 1944: "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1945: } else {
1946: ti = sn->date_sec;
1.1 root 1947: #ifdef _WIN32
1.1.1.5 root 1948: ptm = localtime(&ti);
1949: strftime(date_buf, sizeof(date_buf),
1950: "%Y-%m-%d %H:%M:%S", ptm);
1951: #else
1952: localtime_r(&ti, &tm);
1953: strftime(date_buf, sizeof(date_buf),
1954: "%Y-%m-%d %H:%M:%S", &tm);
1.1 root 1955: #endif
1.1.1.5 root 1956: secs = sn->vm_clock_nsec / 1000000000;
1957: snprintf(clock_buf, sizeof(clock_buf),
1958: "%02d:%02d:%02d.%03d",
1959: (int)(secs / 3600),
1960: (int)((secs / 60) % 60),
1.1.1.6 root 1961: (int)(secs % 60),
1.1.1.5 root 1962: (int)((sn->vm_clock_nsec / 1000000) % 1000));
1963: snprintf(buf, buf_size,
1.1.1.6 root 1964: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 1965: sn->id_str, sn->name,
1966: get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1967: date_buf,
1968: clock_buf);
1969: }
1970: return buf;
1.1 root 1971: }
1972:
1973:
1.1.1.5 root 1974: /**************************************************************/
1975: /* async I/Os */
1976:
1.1.1.7 root 1977: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1.1.1.13 root 1978: QEMUIOVector *qiov, int nb_sectors,
1.1.1.7 root 1979: BlockDriverCompletionFunc *cb, void *opaque)
1980: {
1.1.1.5 root 1981: BlockDriver *drv = bs->drv;
1.1.1.6 root 1982: BlockDriverAIOCB *ret;
1.1.1.5 root 1983:
1984: if (!drv)
1985: return NULL;
1.1.1.7 root 1986: if (bdrv_check_request(bs, sector_num, nb_sectors))
1987: return NULL;
1.1.1.5 root 1988:
1.1.1.13 root 1989: ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1990: cb, opaque);
1.1.1.6 root 1991:
1992: if (ret) {
1993: /* Update stats even though technically transfer has not happened. */
1.1.1.14 root 1994: bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6 root 1995: bs->rd_ops ++;
1996: }
1997:
1998: return ret;
1.1 root 1999: }
2000:
1.1.1.13 root 2001: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
2002: QEMUIOVector *qiov, int nb_sectors,
2003: BlockDriverCompletionFunc *cb, void *opaque)
1.1 root 2004: {
1.1.1.5 root 2005: BlockDriver *drv = bs->drv;
1.1.1.6 root 2006: BlockDriverAIOCB *ret;
1.1 root 2007:
1.1.1.5 root 2008: if (!drv)
2009: return NULL;
2010: if (bs->read_only)
2011: return NULL;
1.1.1.7 root 2012: if (bdrv_check_request(bs, sector_num, nb_sectors))
2013: return NULL;
1.1.1.4 root 2014:
1.1.1.14 root 2015: if (bs->dirty_bitmap) {
2016: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
2017: }
2018:
1.1.1.13 root 2019: ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
2020: cb, opaque);
1.1.1.6 root 2021:
2022: if (ret) {
1.1.1.18! root 2023: /* Update stats even though technically transfer has not happened. */
! 2024: bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
! 2025: bs->wr_ops ++;
! 2026: if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
! 2027: bs->wr_highest_sector = sector_num + nb_sectors - 1;
! 2028: }
1.1.1.6 root 2029: }
2030:
2031: return ret;
1.1.1.5 root 2032: }
2033:
1.1.1.14 root 2034:
2035: typedef struct MultiwriteCB {
2036: int error;
2037: int num_requests;
2038: int num_callbacks;
2039: struct {
2040: BlockDriverCompletionFunc *cb;
2041: void *opaque;
2042: QEMUIOVector *free_qiov;
2043: void *free_buf;
2044: } callbacks[];
2045: } MultiwriteCB;
2046:
2047: static void multiwrite_user_cb(MultiwriteCB *mcb)
2048: {
2049: int i;
2050:
2051: for (i = 0; i < mcb->num_callbacks; i++) {
2052: mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1.1.1.16 root 2053: if (mcb->callbacks[i].free_qiov) {
2054: qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
2055: }
1.1.1.14 root 2056: qemu_free(mcb->callbacks[i].free_qiov);
1.1.1.15 root 2057: qemu_vfree(mcb->callbacks[i].free_buf);
1.1.1.14 root 2058: }
2059: }
2060:
2061: static void multiwrite_cb(void *opaque, int ret)
2062: {
2063: MultiwriteCB *mcb = opaque;
2064:
1.1.1.16 root 2065: if (ret < 0 && !mcb->error) {
1.1.1.14 root 2066: mcb->error = ret;
2067: }
2068:
2069: mcb->num_requests--;
2070: if (mcb->num_requests == 0) {
1.1.1.17 root 2071: multiwrite_user_cb(mcb);
1.1.1.14 root 2072: qemu_free(mcb);
2073: }
2074: }
2075:
2076: static int multiwrite_req_compare(const void *a, const void *b)
2077: {
1.1.1.17 root 2078: const BlockRequest *req1 = a, *req2 = b;
2079:
2080: /*
2081: * Note that we can't simply subtract req2->sector from req1->sector
2082: * here as that could overflow the return value.
2083: */
2084: if (req1->sector > req2->sector) {
2085: return 1;
2086: } else if (req1->sector < req2->sector) {
2087: return -1;
2088: } else {
2089: return 0;
2090: }
1.1.1.14 root 2091: }
2092:
2093: /*
2094: * Takes a bunch of requests and tries to merge them. Returns the number of
2095: * requests that remain after merging.
2096: */
2097: static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
2098: int num_reqs, MultiwriteCB *mcb)
2099: {
2100: int i, outidx;
2101:
2102: // Sort requests by start sector
2103: qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
2104:
2105: // Check if adjacent requests touch the same clusters. If so, combine them,
2106: // filling up gaps with zero sectors.
2107: outidx = 0;
2108: for (i = 1; i < num_reqs; i++) {
2109: int merge = 0;
2110: int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
2111:
2112: // This handles the cases that are valid for all block drivers, namely
2113: // exactly sequential writes and overlapping writes.
2114: if (reqs[i].sector <= oldreq_last) {
2115: merge = 1;
2116: }
2117:
2118: // The block driver may decide that it makes sense to combine requests
2119: // even if there is a gap of some sectors between them. In this case,
2120: // the gap is filled with zeros (therefore only applicable for yet
2121: // unused space in format like qcow2).
2122: if (!merge && bs->drv->bdrv_merge_requests) {
2123: merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
2124: }
2125:
1.1.1.16 root 2126: if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
2127: merge = 0;
2128: }
2129:
1.1.1.14 root 2130: if (merge) {
2131: size_t size;
2132: QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
2133: qemu_iovec_init(qiov,
2134: reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
2135:
2136: // Add the first request to the merged one. If the requests are
2137: // overlapping, drop the last sectors of the first request.
2138: size = (reqs[i].sector - reqs[outidx].sector) << 9;
2139: qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
2140:
2141: // We might need to add some zeros between the two requests
2142: if (reqs[i].sector > oldreq_last) {
2143: size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
2144: uint8_t *buf = qemu_blockalign(bs, zero_bytes);
2145: memset(buf, 0, zero_bytes);
2146: qemu_iovec_add(qiov, buf, zero_bytes);
2147: mcb->callbacks[i].free_buf = buf;
2148: }
2149:
2150: // Add the second request
2151: qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
2152:
1.1.1.17 root 2153: reqs[outidx].nb_sectors = qiov->size >> 9;
1.1.1.14 root 2154: reqs[outidx].qiov = qiov;
2155:
2156: mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
2157: } else {
2158: outidx++;
2159: reqs[outidx].sector = reqs[i].sector;
2160: reqs[outidx].nb_sectors = reqs[i].nb_sectors;
2161: reqs[outidx].qiov = reqs[i].qiov;
2162: }
2163: }
2164:
2165: return outidx + 1;
2166: }
2167:
2168: /*
2169: * Submit multiple AIO write requests at once.
2170: *
2171: * On success, the function returns 0 and all requests in the reqs array have
2172: * been submitted. In error case this function returns -1, and any of the
2173: * requests may or may not be submitted yet. In particular, this means that the
2174: * callback will be called for some of the requests, for others it won't. The
2175: * caller must check the error field of the BlockRequest to wait for the right
2176: * callbacks (if error != 0, no callback will be called).
2177: *
2178: * The implementation may modify the contents of the reqs array, e.g. to merge
2179: * requests. However, the fields opaque and error are left unmodified as they
2180: * are used to signal failure for a single request to the caller.
2181: */
2182: int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
2183: {
2184: BlockDriverAIOCB *acb;
2185: MultiwriteCB *mcb;
2186: int i;
2187:
2188: if (num_reqs == 0) {
2189: return 0;
2190: }
2191:
2192: // Create MultiwriteCB structure
2193: mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
2194: mcb->num_requests = 0;
2195: mcb->num_callbacks = num_reqs;
2196:
2197: for (i = 0; i < num_reqs; i++) {
2198: mcb->callbacks[i].cb = reqs[i].cb;
2199: mcb->callbacks[i].opaque = reqs[i].opaque;
2200: }
2201:
2202: // Check for mergable requests
2203: num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2204:
1.1.1.17 root 2205: /*
2206: * Run the aio requests. As soon as one request can't be submitted
2207: * successfully, fail all requests that are not yet submitted (we must
2208: * return failure for all requests anyway)
2209: *
2210: * num_requests cannot be set to the right value immediately: If
2211: * bdrv_aio_writev fails for some request, num_requests would be too high
2212: * and therefore multiwrite_cb() would never recognize the multiwrite
2213: * request as completed. We also cannot use the loop variable i to set it
2214: * when the first request fails because the callback may already have been
2215: * called for previously submitted requests. Thus, num_requests must be
2216: * incremented for each request that is submitted.
2217: *
2218: * The problem that callbacks may be called early also means that we need
2219: * to take care that num_requests doesn't become 0 before all requests are
2220: * submitted - multiwrite_cb() would consider the multiwrite request
2221: * completed. A dummy request that is "completed" by a manual call to
2222: * multiwrite_cb() takes care of this.
2223: */
2224: mcb->num_requests = 1;
2225:
1.1.1.14 root 2226: for (i = 0; i < num_reqs; i++) {
1.1.1.17 root 2227: mcb->num_requests++;
1.1.1.14 root 2228: acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2229: reqs[i].nb_sectors, multiwrite_cb, mcb);
2230:
2231: if (acb == NULL) {
2232: // We can only fail the whole thing if no request has been
2233: // submitted yet. Otherwise we'll wait for the submitted AIOs to
2234: // complete and report the error in the callback.
1.1.1.17 root 2235: if (i == 0) {
1.1.1.14 root 2236: goto fail;
2237: } else {
1.1.1.16 root 2238: multiwrite_cb(mcb, -EIO);
1.1.1.14 root 2239: break;
2240: }
2241: }
2242: }
2243:
1.1.1.17 root 2244: /* Complete the dummy request */
2245: multiwrite_cb(mcb, 0);
2246:
1.1.1.14 root 2247: return 0;
2248:
2249: fail:
1.1.1.17 root 2250: for (i = 0; i < mcb->num_callbacks; i++) {
2251: reqs[i].error = -EIO;
2252: }
2253: qemu_free(mcb);
1.1.1.14 root 2254: return -1;
2255: }
2256:
2257: BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2258: BlockDriverCompletionFunc *cb, void *opaque)
2259: {
2260: BlockDriver *drv = bs->drv;
2261:
1.1.1.18! root 2262: if (bs->open_flags & BDRV_O_NO_FLUSH) {
! 2263: return bdrv_aio_noop_em(bs, cb, opaque);
! 2264: }
! 2265:
1.1.1.14 root 2266: if (!drv)
2267: return NULL;
2268: return drv->bdrv_aio_flush(bs, cb, opaque);
2269: }
2270:
1.1.1.5 root 2271: void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1.1.1.4 root 2272: {
1.1.1.10 root 2273: acb->pool->cancel(acb);
1.1.1.5 root 2274: }
1.1.1.4 root 2275:
2276:
1.1.1.5 root 2277: /**************************************************************/
2278: /* async block device emulation */
1.1.1.4 root 2279:
1.1.1.13 root 2280: typedef struct BlockDriverAIOCBSync {
2281: BlockDriverAIOCB common;
2282: QEMUBH *bh;
2283: int ret;
2284: /* vector translation state */
2285: QEMUIOVector *qiov;
2286: uint8_t *bounce;
2287: int is_write;
2288: } BlockDriverAIOCBSync;
2289:
2290: static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2291: {
1.1.1.18! root 2292: BlockDriverAIOCBSync *acb =
! 2293: container_of(blockacb, BlockDriverAIOCBSync, common);
1.1.1.13 root 2294: qemu_bh_delete(acb->bh);
2295: acb->bh = NULL;
2296: qemu_aio_release(acb);
2297: }
2298:
2299: static AIOPool bdrv_em_aio_pool = {
2300: .aiocb_size = sizeof(BlockDriverAIOCBSync),
2301: .cancel = bdrv_aio_cancel_em,
2302: };
2303:
1.1.1.5 root 2304: static void bdrv_aio_bh_cb(void *opaque)
1.1.1.4 root 2305: {
1.1.1.5 root 2306: BlockDriverAIOCBSync *acb = opaque;
1.1.1.13 root 2307:
2308: if (!acb->is_write)
2309: qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2310: qemu_vfree(acb->bounce);
1.1.1.5 root 2311: acb->common.cb(acb->common.opaque, acb->ret);
1.1.1.13 root 2312: qemu_bh_delete(acb->bh);
2313: acb->bh = NULL;
1.1.1.5 root 2314: qemu_aio_release(acb);
1.1.1.4 root 2315: }
2316:
1.1.1.13 root 2317: static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2318: int64_t sector_num,
2319: QEMUIOVector *qiov,
2320: int nb_sectors,
2321: BlockDriverCompletionFunc *cb,
2322: void *opaque,
2323: int is_write)
2324:
1.1 root 2325: {
1.1.1.5 root 2326: BlockDriverAIOCBSync *acb;
1.1 root 2327:
1.1.1.13 root 2328: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2329: acb->is_write = is_write;
2330: acb->qiov = qiov;
2331: acb->bounce = qemu_blockalign(bs, qiov->size);
2332:
1.1.1.5 root 2333: if (!acb->bh)
2334: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1.1.1.13 root 2335:
2336: if (is_write) {
2337: qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2338: acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2339: } else {
2340: acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2341: }
2342:
1.1.1.5 root 2343: qemu_bh_schedule(acb->bh);
1.1.1.13 root 2344:
1.1.1.5 root 2345: return &acb->common;
2346: }
1.1 root 2347:
1.1.1.13 root 2348: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2349: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 2350: BlockDriverCompletionFunc *cb, void *opaque)
2351: {
1.1.1.13 root 2352: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1.1.1.5 root 2353: }
2354:
1.1.1.13 root 2355: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2356: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2357: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 2358: {
1.1.1.13 root 2359: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1.1 root 2360: }
2361:
1.1.1.14 root 2362: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2363: BlockDriverCompletionFunc *cb, void *opaque)
2364: {
2365: BlockDriverAIOCBSync *acb;
2366:
2367: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2368: acb->is_write = 1; /* don't bounce in the completion hadler */
2369: acb->qiov = NULL;
2370: acb->bounce = NULL;
2371: acb->ret = 0;
2372:
2373: if (!acb->bh)
2374: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2375:
2376: bdrv_flush(bs);
2377: qemu_bh_schedule(acb->bh);
2378: return &acb->common;
2379: }
2380:
1.1.1.18! root 2381: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
! 2382: BlockDriverCompletionFunc *cb, void *opaque)
! 2383: {
! 2384: BlockDriverAIOCBSync *acb;
! 2385:
! 2386: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
! 2387: acb->is_write = 1; /* don't bounce in the completion handler */
! 2388: acb->qiov = NULL;
! 2389: acb->bounce = NULL;
! 2390: acb->ret = 0;
! 2391:
! 2392: if (!acb->bh) {
! 2393: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
! 2394: }
! 2395:
! 2396: qemu_bh_schedule(acb->bh);
! 2397: return &acb->common;
! 2398: }
! 2399:
1.1.1.5 root 2400: /**************************************************************/
2401: /* sync block device emulation */
2402:
2403: static void bdrv_rw_em_cb(void *opaque, int ret)
1.1.1.4 root 2404: {
1.1.1.5 root 2405: *(int *)opaque = ret;
1.1.1.4 root 2406: }
2407:
1.1.1.5 root 2408: #define NOT_DONE 0x7fffffff
2409:
1.1.1.6 root 2410: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 2411: uint8_t *buf, int nb_sectors)
2412: {
2413: int async_ret;
2414: BlockDriverAIOCB *acb;
1.1.1.13 root 2415: struct iovec iov;
2416: QEMUIOVector qiov;
1.1.1.5 root 2417:
1.1.1.14 root 2418: async_context_push();
2419:
1.1.1.5 root 2420: async_ret = NOT_DONE;
1.1.1.13 root 2421: iov.iov_base = (void *)buf;
1.1.1.18! root 2422: iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13 root 2423: qemu_iovec_init_external(&qiov, &iov, 1);
2424: acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2425: bdrv_rw_em_cb, &async_ret);
1.1.1.14 root 2426: if (acb == NULL) {
2427: async_ret = -1;
2428: goto fail;
2429: }
1.1.1.7 root 2430:
1.1.1.5 root 2431: while (async_ret == NOT_DONE) {
2432: qemu_aio_wait();
2433: }
1.1.1.7 root 2434:
1.1.1.14 root 2435:
2436: fail:
2437: async_context_pop();
1.1.1.5 root 2438: return async_ret;
2439: }
2440:
2441: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2442: const uint8_t *buf, int nb_sectors)
2443: {
2444: int async_ret;
2445: BlockDriverAIOCB *acb;
1.1.1.13 root 2446: struct iovec iov;
2447: QEMUIOVector qiov;
1.1.1.5 root 2448:
1.1.1.14 root 2449: async_context_push();
2450:
1.1.1.5 root 2451: async_ret = NOT_DONE;
1.1.1.13 root 2452: iov.iov_base = (void *)buf;
1.1.1.18! root 2453: iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13 root 2454: qemu_iovec_init_external(&qiov, &iov, 1);
2455: acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2456: bdrv_rw_em_cb, &async_ret);
1.1.1.14 root 2457: if (acb == NULL) {
2458: async_ret = -1;
2459: goto fail;
2460: }
1.1.1.5 root 2461: while (async_ret == NOT_DONE) {
2462: qemu_aio_wait();
2463: }
1.1.1.14 root 2464:
2465: fail:
2466: async_context_pop();
1.1.1.5 root 2467: return async_ret;
2468: }
1.1 root 2469:
2470: void bdrv_init(void)
2471: {
1.1.1.13 root 2472: module_call_init(MODULE_INIT_BLOCK);
1.1.1.10 root 2473: }
2474:
1.1.1.14 root 2475: void bdrv_init_with_whitelist(void)
2476: {
2477: use_bdrv_whitelist = 1;
2478: bdrv_init();
2479: }
2480:
1.1.1.13 root 2481: void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2482: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 2483: {
2484: BlockDriverAIOCB *acb;
2485:
1.1.1.10 root 2486: if (pool->free_aiocb) {
2487: acb = pool->free_aiocb;
2488: pool->free_aiocb = acb->next;
1.1.1.5 root 2489: } else {
1.1.1.10 root 2490: acb = qemu_mallocz(pool->aiocb_size);
2491: acb->pool = pool;
1.1.1.5 root 2492: }
2493: acb->bs = bs;
2494: acb->cb = cb;
2495: acb->opaque = opaque;
2496: return acb;
2497: }
2498:
2499: void qemu_aio_release(void *p)
2500: {
1.1.1.10 root 2501: BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2502: AIOPool *pool = acb->pool;
2503: acb->next = pool->free_aiocb;
2504: pool->free_aiocb = acb;
1.1.1.5 root 2505: }
2506:
2507: /**************************************************************/
2508: /* removable device support */
2509:
2510: /**
2511: * Return TRUE if the media is present
2512: */
2513: int bdrv_is_inserted(BlockDriverState *bs)
2514: {
2515: BlockDriver *drv = bs->drv;
2516: int ret;
2517: if (!drv)
2518: return 0;
2519: if (!drv->bdrv_is_inserted)
1.1.1.18! root 2520: return !bs->tray_open;
1.1.1.5 root 2521: ret = drv->bdrv_is_inserted(bs);
2522: return ret;
2523: }
2524:
2525: /**
2526: * Return TRUE if the media changed since the last call to this
1.1.1.6 root 2527: * function. It is currently only used for floppy disks
1.1.1.5 root 2528: */
2529: int bdrv_media_changed(BlockDriverState *bs)
2530: {
2531: BlockDriver *drv = bs->drv;
2532: int ret;
2533:
2534: if (!drv || !drv->bdrv_media_changed)
2535: ret = -ENOTSUP;
2536: else
2537: ret = drv->bdrv_media_changed(bs);
2538: if (ret == -ENOTSUP)
2539: ret = bs->media_changed;
2540: bs->media_changed = 0;
2541: return ret;
2542: }
2543:
2544: /**
2545: * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2546: */
1.1.1.13 root 2547: int bdrv_eject(BlockDriverState *bs, int eject_flag)
1.1.1.5 root 2548: {
2549: BlockDriver *drv = bs->drv;
2550: int ret;
2551:
1.1.1.13 root 2552: if (bs->locked) {
2553: return -EBUSY;
2554: }
2555:
1.1.1.5 root 2556: if (!drv || !drv->bdrv_eject) {
2557: ret = -ENOTSUP;
2558: } else {
2559: ret = drv->bdrv_eject(bs, eject_flag);
2560: }
2561: if (ret == -ENOTSUP) {
1.1.1.13 root 2562: ret = 0;
1.1.1.5 root 2563: }
1.1.1.18! root 2564: if (ret >= 0) {
! 2565: bs->tray_open = eject_flag;
! 2566: }
1.1.1.13 root 2567:
2568: return ret;
1.1.1.5 root 2569: }
2570:
2571: int bdrv_is_locked(BlockDriverState *bs)
2572: {
2573: return bs->locked;
2574: }
2575:
2576: /**
2577: * Lock or unlock the media (if it is locked, the user won't be able
2578: * to eject it manually).
2579: */
2580: void bdrv_set_locked(BlockDriverState *bs, int locked)
2581: {
2582: BlockDriver *drv = bs->drv;
2583:
2584: bs->locked = locked;
2585: if (drv && drv->bdrv_set_locked) {
2586: drv->bdrv_set_locked(bs, locked);
2587: }
1.1 root 2588: }
1.1.1.6 root 2589:
2590: /* needed for generic scsi interface */
2591:
2592: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2593: {
2594: BlockDriver *drv = bs->drv;
2595:
2596: if (drv && drv->bdrv_ioctl)
2597: return drv->bdrv_ioctl(bs, req, buf);
2598: return -ENOTSUP;
2599: }
1.1.1.13 root 2600:
2601: BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2602: unsigned long int req, void *buf,
2603: BlockDriverCompletionFunc *cb, void *opaque)
2604: {
2605: BlockDriver *drv = bs->drv;
2606:
2607: if (drv && drv->bdrv_aio_ioctl)
2608: return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2609: return NULL;
2610: }
2611:
1.1.1.14 root 2612:
2613:
1.1.1.13 root 2614: void *qemu_blockalign(BlockDriverState *bs, size_t size)
2615: {
2616: return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2617: }
1.1.1.14 root 2618:
2619: void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2620: {
2621: int64_t bitmap_size;
2622:
1.1.1.18! root 2623: bs->dirty_count = 0;
1.1.1.14 root 2624: if (enable) {
2625: if (!bs->dirty_bitmap) {
2626: bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2627: BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2628: bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2629:
2630: bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2631: }
2632: } else {
2633: if (bs->dirty_bitmap) {
2634: qemu_free(bs->dirty_bitmap);
2635: bs->dirty_bitmap = NULL;
2636: }
2637: }
2638: }
2639:
2640: int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2641: {
2642: int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2643:
2644: if (bs->dirty_bitmap &&
2645: (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2646: return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2647: (1 << (chunk % (sizeof(unsigned long) * 8)));
2648: } else {
2649: return 0;
2650: }
2651: }
2652:
2653: void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2654: int nr_sectors)
2655: {
2656: set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2657: }
1.1.1.18! root 2658:
! 2659: int64_t bdrv_get_dirty_count(BlockDriverState *bs)
! 2660: {
! 2661: return bs->dirty_count;
! 2662: }
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