Annotation of qemu/block.c, revision 1.1.1.14
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);
1.1.1.6 root 53: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 54: uint8_t *buf, int nb_sectors);
55: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
56: const uint8_t *buf, int nb_sectors);
1.1.1.3 root 57:
1.1.1.6 root 58: BlockDriverState *bdrv_first;
1.1.1.7 root 59:
1.1 root 60: static BlockDriver *first_drv;
61:
1.1.1.14! root 62: /* If non-zero, use only whitelisted block drivers */
! 63: static int use_bdrv_whitelist;
! 64:
1.1.1.5 root 65: int path_is_absolute(const char *path)
66: {
67: const char *p;
68: #ifdef _WIN32
69: /* specific case for names like: "\\.\d:" */
70: if (*path == '/' || *path == '\\')
71: return 1;
72: #endif
73: p = strchr(path, ':');
74: if (p)
75: p++;
76: else
77: p = path;
78: #ifdef _WIN32
79: return (*p == '/' || *p == '\\');
80: #else
81: return (*p == '/');
82: #endif
1.1.1.2 root 83: }
84:
1.1.1.5 root 85: /* if filename is absolute, just copy it to dest. Otherwise, build a
86: path to it by considering it is relative to base_path. URL are
87: supported. */
88: void path_combine(char *dest, int dest_size,
89: const char *base_path,
90: const char *filename)
91: {
92: const char *p, *p1;
93: int len;
94:
95: if (dest_size <= 0)
96: return;
97: if (path_is_absolute(filename)) {
98: pstrcpy(dest, dest_size, filename);
99: } else {
100: p = strchr(base_path, ':');
101: if (p)
102: p++;
103: else
104: p = base_path;
105: p1 = strrchr(base_path, '/');
106: #ifdef _WIN32
107: {
108: const char *p2;
109: p2 = strrchr(base_path, '\\');
110: if (!p1 || p2 > p1)
111: p1 = p2;
1.1.1.2 root 112: }
1.1.1.5 root 113: #endif
114: if (p1)
115: p1++;
116: else
117: p1 = base_path;
118: if (p1 > p)
119: p = p1;
120: len = p - base_path;
121: if (len > dest_size - 1)
122: len = dest_size - 1;
123: memcpy(dest, base_path, len);
124: dest[len] = '\0';
125: pstrcat(dest, dest_size, filename);
1.1.1.2 root 126: }
127: }
128:
1.1.1.13 root 129: void bdrv_register(BlockDriver *bdrv)
1.1 root 130: {
1.1.1.13 root 131: if (!bdrv->bdrv_aio_readv) {
1.1.1.5 root 132: /* add AIO emulation layer */
1.1.1.13 root 133: bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
134: bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
135: } else if (!bdrv->bdrv_read) {
1.1.1.5 root 136: /* add synchronous IO emulation layer */
137: bdrv->bdrv_read = bdrv_read_em;
138: bdrv->bdrv_write = bdrv_write_em;
139: }
1.1.1.14! root 140:
! 141: if (!bdrv->bdrv_aio_flush)
! 142: bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
! 143:
1.1 root 144: bdrv->next = first_drv;
145: first_drv = bdrv;
146: }
147:
148: /* create a new block device (by default it is empty) */
149: BlockDriverState *bdrv_new(const char *device_name)
150: {
151: BlockDriverState **pbs, *bs;
152:
153: bs = qemu_mallocz(sizeof(BlockDriverState));
154: pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
155: if (device_name[0] != '\0') {
156: /* insert at the end */
157: pbs = &bdrv_first;
158: while (*pbs != NULL)
159: pbs = &(*pbs)->next;
160: *pbs = bs;
161: }
162: return bs;
163: }
164:
165: BlockDriver *bdrv_find_format(const char *format_name)
166: {
167: BlockDriver *drv1;
168: for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
169: if (!strcmp(drv1->format_name, format_name))
170: return drv1;
171: }
172: return NULL;
173: }
174:
1.1.1.14! root 175: static int bdrv_is_whitelisted(BlockDriver *drv)
! 176: {
! 177: static const char *whitelist[] = {
! 178: CONFIG_BDRV_WHITELIST
! 179: };
! 180: const char **p;
! 181:
! 182: if (!whitelist[0])
! 183: return 1; /* no whitelist, anything goes */
! 184:
! 185: for (p = whitelist; *p; p++) {
! 186: if (!strcmp(drv->format_name, *p)) {
! 187: return 1;
! 188: }
! 189: }
! 190: return 0;
! 191: }
! 192:
! 193: BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
! 194: {
! 195: BlockDriver *drv = bdrv_find_format(format_name);
! 196: return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
! 197: }
! 198:
1.1.1.13 root 199: int bdrv_create(BlockDriver *drv, const char* filename,
200: QEMUOptionParameter *options)
1.1 root 201: {
202: if (!drv->bdrv_create)
203: return -ENOTSUP;
1.1.1.13 root 204:
205: return drv->bdrv_create(filename, options);
1.1 root 206: }
207:
208: #ifdef _WIN32
1.1.1.2 root 209: void get_tmp_filename(char *filename, int size)
1.1 root 210: {
1.1.1.5 root 211: char temp_dir[MAX_PATH];
1.1.1.6 root 212:
1.1.1.5 root 213: GetTempPath(MAX_PATH, temp_dir);
214: GetTempFileName(temp_dir, "qem", 0, filename);
1.1 root 215: }
216: #else
1.1.1.2 root 217: void get_tmp_filename(char *filename, int size)
1.1 root 218: {
219: int fd;
1.1.1.7 root 220: const char *tmpdir;
1.1 root 221: /* XXX: race condition possible */
1.1.1.7 root 222: tmpdir = getenv("TMPDIR");
223: if (!tmpdir)
224: tmpdir = "/tmp";
225: snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
1.1 root 226: fd = mkstemp(filename);
227: close(fd);
228: }
229: #endif
230:
1.1.1.5 root 231: #ifdef _WIN32
232: static int is_windows_drive_prefix(const char *filename)
233: {
234: return (((filename[0] >= 'a' && filename[0] <= 'z') ||
235: (filename[0] >= 'A' && filename[0] <= 'Z')) &&
236: filename[1] == ':');
237: }
1.1.1.6 root 238:
1.1.1.13 root 239: int is_windows_drive(const char *filename)
1.1.1.5 root 240: {
1.1.1.6 root 241: if (is_windows_drive_prefix(filename) &&
1.1.1.5 root 242: filename[2] == '\0')
243: return 1;
244: if (strstart(filename, "\\\\.\\", NULL) ||
245: strstart(filename, "//./", NULL))
246: return 1;
247: return 0;
248: }
249: #endif
250:
251: static BlockDriver *find_protocol(const char *filename)
252: {
253: BlockDriver *drv1;
254: char protocol[128];
255: int len;
256: const char *p;
257:
258: #ifdef _WIN32
259: if (is_windows_drive(filename) ||
260: is_windows_drive_prefix(filename))
1.1.1.13 root 261: return bdrv_find_format("raw");
1.1.1.5 root 262: #endif
263: p = strchr(filename, ':');
264: if (!p)
1.1.1.13 root 265: return bdrv_find_format("raw");
1.1.1.5 root 266: len = p - filename;
267: if (len > sizeof(protocol) - 1)
268: len = sizeof(protocol) - 1;
269: memcpy(protocol, filename, len);
270: protocol[len] = '\0';
271: for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
1.1.1.6 root 272: if (drv1->protocol_name &&
1.1.1.5 root 273: !strcmp(drv1->protocol_name, protocol))
274: return drv1;
275: }
276: return NULL;
277: }
278:
1.1.1.13 root 279: /*
280: * Detect host devices. By convention, /dev/cdrom[N] is always
281: * recognized as a host CDROM.
282: */
283: static BlockDriver *find_hdev_driver(const char *filename)
284: {
285: int score_max = 0, score;
286: BlockDriver *drv = NULL, *d;
287:
288: for (d = first_drv; d; d = d->next) {
289: if (d->bdrv_probe_device) {
290: score = d->bdrv_probe_device(filename);
291: if (score > score_max) {
292: score_max = score;
293: drv = d;
294: }
295: }
296: }
297:
298: return drv;
299: }
300:
1.1 root 301: static BlockDriver *find_image_format(const char *filename)
302: {
1.1.1.5 root 303: int ret, score, score_max;
1.1 root 304: BlockDriver *drv1, *drv;
1.1.1.5 root 305: uint8_t buf[2048];
306: BlockDriverState *bs;
1.1.1.6 root 307:
1.1.1.5 root 308: drv = find_protocol(filename);
309: /* no need to test disk image formats for vvfat */
1.1.1.13 root 310: if (drv && strcmp(drv->format_name, "vvfat") == 0)
1.1.1.5 root 311: return drv;
312:
313: ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
314: if (ret < 0)
315: return NULL;
316: ret = bdrv_pread(bs, 0, buf, sizeof(buf));
317: bdrv_delete(bs);
318: if (ret < 0) {
319: return NULL;
320: }
321:
1.1 root 322: score_max = 0;
323: for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
1.1.1.5 root 324: if (drv1->bdrv_probe) {
325: score = drv1->bdrv_probe(buf, ret, filename);
326: if (score > score_max) {
327: score_max = score;
328: drv = drv1;
329: }
1.1 root 330: }
331: }
332: return drv;
333: }
334:
1.1.1.5 root 335: int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
1.1 root 336: {
1.1.1.5 root 337: BlockDriverState *bs;
338: int ret;
339:
340: bs = bdrv_new("");
341: ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
342: if (ret < 0) {
343: bdrv_delete(bs);
344: return ret;
1.1.1.2 root 345: }
1.1.1.7 root 346: bs->growable = 1;
1.1.1.5 root 347: *pbs = bs;
348: return 0;
349: }
350:
351: int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
352: {
353: return bdrv_open2(bs, filename, flags, NULL);
1.1 root 354: }
355:
1.1.1.5 root 356: int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
1.1 root 357: BlockDriver *drv)
358: {
1.1.1.14! root 359: int ret, open_flags, try_rw;
1.1.1.6 root 360: char tmp_filename[PATH_MAX];
361: char backing_filename[PATH_MAX];
362:
1.1 root 363: bs->is_temporary = 0;
364: bs->encrypted = 0;
1.1.1.8 root 365: bs->valid_key = 0;
1.1.1.13 root 366: /* buffer_alignment defaulted to 512, drivers can change this value */
367: bs->buffer_alignment = 512;
1.1 root 368:
1.1.1.5 root 369: if (flags & BDRV_O_SNAPSHOT) {
1.1 root 370: BlockDriverState *bs1;
371: int64_t total_size;
1.1.1.7 root 372: int is_protocol = 0;
1.1.1.13 root 373: BlockDriver *bdrv_qcow2;
374: QEMUOptionParameter *options;
1.1.1.6 root 375:
1.1 root 376: /* if snapshot, we create a temporary backing file and open it
377: instead of opening 'filename' directly */
378:
379: /* if there is a backing file, use it */
380: bs1 = bdrv_new("");
1.1.1.13 root 381: ret = bdrv_open2(bs1, filename, 0, drv);
1.1.1.8 root 382: if (ret < 0) {
1.1 root 383: bdrv_delete(bs1);
1.1.1.8 root 384: return ret;
1.1 root 385: }
1.1.1.14! root 386: total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
1.1.1.7 root 387:
388: if (bs1->drv && bs1->drv->protocol_name)
389: is_protocol = 1;
390:
1.1 root 391: bdrv_delete(bs1);
1.1.1.6 root 392:
1.1 root 393: get_tmp_filename(tmp_filename, sizeof(tmp_filename));
1.1.1.7 root 394:
395: /* Real path is meaningless for protocols */
396: if (is_protocol)
397: snprintf(backing_filename, sizeof(backing_filename),
398: "%s", filename);
399: else
400: realpath(filename, backing_filename);
401:
1.1.1.13 root 402: bdrv_qcow2 = bdrv_find_format("qcow2");
403: options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
404:
405: set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
406: set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
407: if (drv) {
408: set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
409: drv->format_name);
410: }
411:
412: ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
1.1.1.8 root 413: if (ret < 0) {
414: return ret;
1.1 root 415: }
1.1.1.13 root 416:
1.1 root 417: filename = tmp_filename;
1.1.1.13 root 418: drv = bdrv_qcow2;
1.1 root 419: bs->is_temporary = 1;
420: }
421:
422: pstrcpy(bs->filename, sizeof(bs->filename), filename);
1.1.1.5 root 423: if (flags & BDRV_O_FILE) {
424: drv = find_protocol(filename);
1.1.1.8 root 425: } else if (!drv) {
1.1.1.13 root 426: drv = find_hdev_driver(filename);
427: if (!drv) {
428: drv = find_image_format(filename);
429: }
1.1.1.8 root 430: }
431: if (!drv) {
432: ret = -ENOENT;
433: goto unlink_and_fail;
1.1 root 434: }
435: bs->drv = drv;
436: bs->opaque = qemu_mallocz(drv->instance_size);
1.1.1.14! root 437:
! 438: /*
! 439: * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
! 440: * write cache to the guest. We do need the fdatasync to flush
! 441: * out transactions for block allocations, and we maybe have a
! 442: * volatile write cache in our backing device to deal with.
! 443: */
! 444: if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
! 445: bs->enable_write_cache = 1;
! 446:
1.1.1.5 root 447: /* Note: for compatibility, we open disk image files as RDWR, and
448: RDONLY as fallback */
1.1.1.14! root 449: try_rw = !bs->read_only || bs->is_temporary;
1.1.1.5 root 450: if (!(flags & BDRV_O_FILE))
1.1.1.14! root 451: open_flags = (try_rw ? BDRV_O_RDWR : 0) |
! 452: (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO));
1.1.1.5 root 453: else
454: open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
1.1.1.14! root 455: if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv))
! 456: ret = -ENOTSUP;
! 457: else
! 458: ret = drv->bdrv_open(bs, filename, open_flags);
1.1.1.7 root 459: if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
460: ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
1.1.1.5 root 461: bs->read_only = 1;
462: }
1.1 root 463: if (ret < 0) {
464: qemu_free(bs->opaque);
1.1.1.5 root 465: bs->opaque = NULL;
466: bs->drv = NULL;
1.1.1.8 root 467: unlink_and_fail:
468: if (bs->is_temporary)
469: unlink(filename);
1.1.1.5 root 470: return ret;
471: }
472: if (drv->bdrv_getlength) {
1.1.1.14! root 473: bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1 root 474: }
475: #ifndef _WIN32
476: if (bs->is_temporary) {
477: unlink(filename);
478: }
479: #endif
1.1.1.5 root 480: if (bs->backing_file[0] != '\0') {
1.1 root 481: /* if there is a backing file, use it */
1.1.1.13 root 482: BlockDriver *back_drv = NULL;
1.1 root 483: bs->backing_hd = bdrv_new("");
1.1.1.14! root 484: /* pass on read_only property to the backing_hd */
! 485: bs->backing_hd->read_only = bs->read_only;
1.1.1.5 root 486: path_combine(backing_filename, sizeof(backing_filename),
487: filename, bs->backing_file);
1.1.1.13 root 488: if (bs->backing_format[0] != '\0')
489: back_drv = bdrv_find_format(bs->backing_format);
490: ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
491: back_drv);
1.1.1.8 root 492: if (ret < 0) {
493: bdrv_close(bs);
494: return ret;
495: }
1.1 root 496: }
497:
1.1.1.13 root 498: if (!bdrv_key_required(bs)) {
499: /* call the change callback */
500: bs->media_changed = 1;
501: if (bs->change_cb)
502: bs->change_cb(bs->change_opaque);
503: }
1.1 root 504: return 0;
505: }
506:
507: void bdrv_close(BlockDriverState *bs)
508: {
1.1.1.5 root 509: if (bs->drv) {
1.1 root 510: if (bs->backing_hd)
511: bdrv_delete(bs->backing_hd);
512: bs->drv->bdrv_close(bs);
513: qemu_free(bs->opaque);
514: #ifdef _WIN32
515: if (bs->is_temporary) {
516: unlink(bs->filename);
517: }
518: #endif
519: bs->opaque = NULL;
520: bs->drv = NULL;
521:
522: /* call the change callback */
1.1.1.5 root 523: bs->media_changed = 1;
1.1 root 524: if (bs->change_cb)
525: bs->change_cb(bs->change_opaque);
526: }
527: }
528:
529: void bdrv_delete(BlockDriverState *bs)
530: {
1.1.1.7 root 531: BlockDriverState **pbs;
532:
533: pbs = &bdrv_first;
534: while (*pbs != bs && *pbs != NULL)
535: pbs = &(*pbs)->next;
536: if (*pbs == bs)
537: *pbs = bs->next;
538:
1.1 root 539: bdrv_close(bs);
540: qemu_free(bs);
541: }
542:
1.1.1.13 root 543: /*
544: * Run consistency checks on an image
545: *
546: * Returns the number of errors or -errno when an internal error occurs
547: */
548: int bdrv_check(BlockDriverState *bs)
549: {
550: if (bs->drv->bdrv_check == NULL) {
551: return -ENOTSUP;
552: }
553:
554: return bs->drv->bdrv_check(bs);
555: }
556:
1.1 root 557: /* commit COW file into the raw image */
558: int bdrv_commit(BlockDriverState *bs)
559: {
1.1.1.5 root 560: BlockDriver *drv = bs->drv;
561: int64_t i, total_sectors;
1.1 root 562: int n, j;
563: unsigned char sector[512];
564:
1.1.1.5 root 565: if (!drv)
566: return -ENOMEDIUM;
1.1 root 567:
568: if (bs->read_only) {
569: return -EACCES;
570: }
571:
572: if (!bs->backing_hd) {
573: return -ENOTSUP;
574: }
575:
1.1.1.14! root 576: total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1.1.5 root 577: for (i = 0; i < total_sectors;) {
578: if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
1.1 root 579: for(j = 0; j < n; j++) {
580: if (bdrv_read(bs, i, sector, 1) != 0) {
581: return -EIO;
582: }
583:
584: if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
585: return -EIO;
586: }
587: i++;
588: }
589: } else {
590: i += n;
591: }
592: }
1.1.1.2 root 593:
1.1.1.5 root 594: if (drv->bdrv_make_empty)
595: return drv->bdrv_make_empty(bs);
1.1.1.2 root 596:
1.1 root 597: return 0;
598: }
599:
1.1.1.7 root 600: static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
601: size_t size)
602: {
603: int64_t len;
604:
605: if (!bdrv_is_inserted(bs))
606: return -ENOMEDIUM;
607:
608: if (bs->growable)
609: return 0;
610:
611: len = bdrv_getlength(bs);
612:
1.1.1.11 root 613: if (offset < 0)
614: return -EIO;
615:
616: if ((offset > len) || (len - offset < size))
1.1.1.7 root 617: return -EIO;
618:
619: return 0;
620: }
621:
622: static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
623: int nb_sectors)
624: {
1.1.1.13 root 625: return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
1.1.1.7 root 626: }
627:
1.1.1.5 root 628: /* return < 0 if error. See bdrv_write() for the return codes */
1.1.1.6 root 629: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
1.1 root 630: uint8_t *buf, int nb_sectors)
631: {
632: BlockDriver *drv = bs->drv;
633:
1.1.1.5 root 634: if (!drv)
635: return -ENOMEDIUM;
1.1.1.7 root 636: if (bdrv_check_request(bs, sector_num, nb_sectors))
637: return -EIO;
1.1 root 638:
1.1.1.13 root 639: return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
1.1 root 640: }
641:
1.1.1.14! root 642: static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
! 643: int nb_sectors, int dirty)
! 644: {
! 645: int64_t start, end;
! 646: unsigned long val, idx, bit;
! 647:
! 648: start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
! 649: end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
! 650:
! 651: for (; start <= end; start++) {
! 652: idx = start / (sizeof(unsigned long) * 8);
! 653: bit = start % (sizeof(unsigned long) * 8);
! 654: val = bs->dirty_bitmap[idx];
! 655: if (dirty) {
! 656: val |= 1 << bit;
! 657: } else {
! 658: val &= ~(1 << bit);
! 659: }
! 660: bs->dirty_bitmap[idx] = val;
! 661: }
! 662: }
! 663:
1.1.1.6 root 664: /* Return < 0 if error. Important errors are:
1.1.1.5 root 665: -EIO generic I/O error (may happen for all errors)
666: -ENOMEDIUM No media inserted.
667: -EINVAL Invalid sector number or nb_sectors
668: -EACCES Trying to write a read-only device
669: */
1.1.1.6 root 670: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
1.1 root 671: const uint8_t *buf, int nb_sectors)
672: {
1.1.1.5 root 673: BlockDriver *drv = bs->drv;
674: if (!bs->drv)
675: return -ENOMEDIUM;
1.1 root 676: if (bs->read_only)
1.1.1.5 root 677: return -EACCES;
1.1.1.7 root 678: if (bdrv_check_request(bs, sector_num, nb_sectors))
679: return -EIO;
680:
1.1.1.14! root 681: if (bs->dirty_bitmap) {
! 682: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
! 683: }
! 684:
1.1.1.7 root 685: return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
1.1 root 686: }
687:
1.1.1.13 root 688: int bdrv_pread(BlockDriverState *bs, int64_t offset,
689: void *buf, int count1)
1.1.1.5 root 690: {
1.1.1.14! root 691: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 692: int len, nb_sectors, count;
693: int64_t sector_num;
694:
695: count = count1;
696: /* first read to align to sector start */
1.1.1.14! root 697: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 698: if (len > count)
699: len = count;
1.1.1.14! root 700: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 701: if (len > 0) {
702: if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
703: return -EIO;
1.1.1.14! root 704: memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1.1.1.5 root 705: count -= len;
706: if (count == 0)
707: return count1;
708: sector_num++;
709: buf += len;
710: }
711:
712: /* read the sectors "in place" */
1.1.1.14! root 713: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 714: if (nb_sectors > 0) {
715: if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
716: return -EIO;
717: sector_num += nb_sectors;
1.1.1.14! root 718: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 719: buf += len;
720: count -= len;
721: }
722:
723: /* add data from the last sector */
724: if (count > 0) {
725: if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
726: return -EIO;
727: memcpy(buf, tmp_buf, count);
728: }
729: return count1;
730: }
731:
1.1.1.13 root 732: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
733: const void *buf, int count1)
1.1.1.5 root 734: {
1.1.1.14! root 735: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 736: int len, nb_sectors, count;
737: int64_t sector_num;
738:
739: count = count1;
740: /* first write to align to sector start */
1.1.1.14! root 741: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 742: if (len > count)
743: len = count;
1.1.1.14! root 744: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 745: if (len > 0) {
746: if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
747: return -EIO;
1.1.1.14! root 748: memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1.1.1.5 root 749: if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
750: return -EIO;
751: count -= len;
752: if (count == 0)
753: return count1;
754: sector_num++;
755: buf += len;
756: }
757:
758: /* write the sectors "in place" */
1.1.1.14! root 759: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 760: if (nb_sectors > 0) {
761: if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
762: return -EIO;
763: sector_num += nb_sectors;
1.1.1.14! root 764: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 765: buf += len;
766: count -= len;
767: }
768:
769: /* add data from the last sector */
770: if (count > 0) {
771: if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
772: return -EIO;
773: memcpy(tmp_buf, buf, count);
774: if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
775: return -EIO;
776: }
777: return count1;
778: }
779:
780: /**
781: * Truncate file to 'offset' bytes (needed only for file protocols)
782: */
783: int bdrv_truncate(BlockDriverState *bs, int64_t offset)
784: {
785: BlockDriver *drv = bs->drv;
786: if (!drv)
787: return -ENOMEDIUM;
788: if (!drv->bdrv_truncate)
789: return -ENOTSUP;
1.1.1.14! root 790: if (bs->read_only)
! 791: return -EACCES;
1.1.1.5 root 792: return drv->bdrv_truncate(bs, offset);
793: }
794:
795: /**
796: * Length of a file in bytes. Return < 0 if error or unknown.
797: */
798: int64_t bdrv_getlength(BlockDriverState *bs)
799: {
800: BlockDriver *drv = bs->drv;
801: if (!drv)
802: return -ENOMEDIUM;
803: if (!drv->bdrv_getlength) {
804: /* legacy mode */
1.1.1.14! root 805: return bs->total_sectors * BDRV_SECTOR_SIZE;
1.1.1.5 root 806: }
807: return drv->bdrv_getlength(bs);
808: }
809:
810: /* return 0 as number of sectors if no device present or error */
1.1.1.6 root 811: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1.1 root 812: {
1.1.1.5 root 813: int64_t length;
814: length = bdrv_getlength(bs);
815: if (length < 0)
816: length = 0;
817: else
1.1.1.14! root 818: length = length >> BDRV_SECTOR_BITS;
1.1.1.5 root 819: *nb_sectors_ptr = length;
1.1 root 820: }
821:
1.1.1.7 root 822: struct partition {
823: uint8_t boot_ind; /* 0x80 - active */
824: uint8_t head; /* starting head */
825: uint8_t sector; /* starting sector */
826: uint8_t cyl; /* starting cylinder */
827: uint8_t sys_ind; /* What partition type */
828: uint8_t end_head; /* end head */
829: uint8_t end_sector; /* end sector */
830: uint8_t end_cyl; /* end cylinder */
831: uint32_t start_sect; /* starting sector counting from 0 */
832: uint32_t nr_sects; /* nr of sectors in partition */
833: } __attribute__((packed));
834:
835: /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
836: static int guess_disk_lchs(BlockDriverState *bs,
837: int *pcylinders, int *pheads, int *psectors)
838: {
839: uint8_t buf[512];
840: int ret, i, heads, sectors, cylinders;
841: struct partition *p;
842: uint32_t nr_sects;
843: uint64_t nb_sectors;
844:
845: bdrv_get_geometry(bs, &nb_sectors);
846:
847: ret = bdrv_read(bs, 0, buf, 1);
848: if (ret < 0)
849: return -1;
850: /* test msdos magic */
851: if (buf[510] != 0x55 || buf[511] != 0xaa)
852: return -1;
853: for(i = 0; i < 4; i++) {
854: p = ((struct partition *)(buf + 0x1be)) + i;
855: nr_sects = le32_to_cpu(p->nr_sects);
856: if (nr_sects && p->end_head) {
857: /* We make the assumption that the partition terminates on
858: a cylinder boundary */
859: heads = p->end_head + 1;
860: sectors = p->end_sector & 63;
861: if (sectors == 0)
862: continue;
863: cylinders = nb_sectors / (heads * sectors);
864: if (cylinders < 1 || cylinders > 16383)
865: continue;
866: *pheads = heads;
867: *psectors = sectors;
868: *pcylinders = cylinders;
869: #if 0
870: printf("guessed geometry: LCHS=%d %d %d\n",
871: cylinders, heads, sectors);
872: #endif
873: return 0;
874: }
875: }
876: return -1;
877: }
878:
879: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1.1 root 880: {
1.1.1.7 root 881: int translation, lba_detected = 0;
882: int cylinders, heads, secs;
883: uint64_t nb_sectors;
884:
885: /* if a geometry hint is available, use it */
886: bdrv_get_geometry(bs, &nb_sectors);
887: bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
888: translation = bdrv_get_translation_hint(bs);
889: if (cylinders != 0) {
890: *pcyls = cylinders;
891: *pheads = heads;
892: *psecs = secs;
893: } else {
894: if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
895: if (heads > 16) {
896: /* if heads > 16, it means that a BIOS LBA
897: translation was active, so the default
898: hardware geometry is OK */
899: lba_detected = 1;
900: goto default_geometry;
901: } else {
902: *pcyls = cylinders;
903: *pheads = heads;
904: *psecs = secs;
905: /* disable any translation to be in sync with
906: the logical geometry */
907: if (translation == BIOS_ATA_TRANSLATION_AUTO) {
908: bdrv_set_translation_hint(bs,
909: BIOS_ATA_TRANSLATION_NONE);
910: }
911: }
912: } else {
913: default_geometry:
914: /* if no geometry, use a standard physical disk geometry */
915: cylinders = nb_sectors / (16 * 63);
916:
917: if (cylinders > 16383)
918: cylinders = 16383;
919: else if (cylinders < 2)
920: cylinders = 2;
921: *pcyls = cylinders;
922: *pheads = 16;
923: *psecs = 63;
924: if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
925: if ((*pcyls * *pheads) <= 131072) {
926: bdrv_set_translation_hint(bs,
927: BIOS_ATA_TRANSLATION_LARGE);
928: } else {
929: bdrv_set_translation_hint(bs,
930: BIOS_ATA_TRANSLATION_LBA);
931: }
932: }
933: }
934: bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
935: }
1.1 root 936: }
937:
1.1.1.6 root 938: void bdrv_set_geometry_hint(BlockDriverState *bs,
1.1 root 939: int cyls, int heads, int secs)
940: {
941: bs->cyls = cyls;
942: bs->heads = heads;
943: bs->secs = secs;
944: }
945:
946: void bdrv_set_type_hint(BlockDriverState *bs, int type)
947: {
948: bs->type = type;
949: bs->removable = ((type == BDRV_TYPE_CDROM ||
950: type == BDRV_TYPE_FLOPPY));
951: }
952:
953: void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
954: {
955: bs->translation = translation;
956: }
957:
1.1.1.6 root 958: void bdrv_get_geometry_hint(BlockDriverState *bs,
1.1 root 959: int *pcyls, int *pheads, int *psecs)
960: {
961: *pcyls = bs->cyls;
962: *pheads = bs->heads;
963: *psecs = bs->secs;
964: }
965:
966: int bdrv_get_type_hint(BlockDriverState *bs)
967: {
968: return bs->type;
969: }
970:
971: int bdrv_get_translation_hint(BlockDriverState *bs)
972: {
973: return bs->translation;
974: }
975:
976: int bdrv_is_removable(BlockDriverState *bs)
977: {
978: return bs->removable;
979: }
980:
981: int bdrv_is_read_only(BlockDriverState *bs)
982: {
983: return bs->read_only;
984: }
985:
1.1.1.14! root 986: int bdrv_set_read_only(BlockDriverState *bs, int read_only)
! 987: {
! 988: int ret = bs->read_only;
! 989: bs->read_only = read_only;
! 990: return ret;
! 991: }
! 992:
1.1.1.6 root 993: int bdrv_is_sg(BlockDriverState *bs)
994: {
995: return bs->sg;
996: }
997:
1.1.1.14! root 998: int bdrv_enable_write_cache(BlockDriverState *bs)
! 999: {
! 1000: return bs->enable_write_cache;
! 1001: }
! 1002:
1.1.1.5 root 1003: /* XXX: no longer used */
1.1.1.6 root 1004: void bdrv_set_change_cb(BlockDriverState *bs,
1.1 root 1005: void (*change_cb)(void *opaque), void *opaque)
1006: {
1007: bs->change_cb = change_cb;
1008: bs->change_opaque = opaque;
1009: }
1010:
1011: int bdrv_is_encrypted(BlockDriverState *bs)
1012: {
1013: if (bs->backing_hd && bs->backing_hd->encrypted)
1014: return 1;
1015: return bs->encrypted;
1016: }
1017:
1.1.1.8 root 1018: int bdrv_key_required(BlockDriverState *bs)
1019: {
1020: BlockDriverState *backing_hd = bs->backing_hd;
1021:
1022: if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1023: return 1;
1024: return (bs->encrypted && !bs->valid_key);
1025: }
1026:
1.1 root 1027: int bdrv_set_key(BlockDriverState *bs, const char *key)
1028: {
1029: int ret;
1030: if (bs->backing_hd && bs->backing_hd->encrypted) {
1031: ret = bdrv_set_key(bs->backing_hd, key);
1032: if (ret < 0)
1033: return ret;
1034: if (!bs->encrypted)
1035: return 0;
1036: }
1037: if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
1038: return -1;
1.1.1.8 root 1039: ret = bs->drv->bdrv_set_key(bs, key);
1.1.1.13 root 1040: if (ret < 0) {
1041: bs->valid_key = 0;
1042: } else if (!bs->valid_key) {
1043: bs->valid_key = 1;
1044: /* call the change callback now, we skipped it on open */
1045: bs->media_changed = 1;
1046: if (bs->change_cb)
1047: bs->change_cb(bs->change_opaque);
1048: }
1.1.1.8 root 1049: return ret;
1.1 root 1050: }
1051:
1052: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1053: {
1.1.1.5 root 1054: if (!bs->drv) {
1.1 root 1055: buf[0] = '\0';
1056: } else {
1057: pstrcpy(buf, buf_size, bs->drv->format_name);
1058: }
1059: }
1060:
1.1.1.6 root 1061: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1.1 root 1062: void *opaque)
1063: {
1064: BlockDriver *drv;
1065:
1066: for (drv = first_drv; drv != NULL; drv = drv->next) {
1067: it(opaque, drv->format_name);
1068: }
1069: }
1070:
1071: BlockDriverState *bdrv_find(const char *name)
1072: {
1073: BlockDriverState *bs;
1074:
1075: for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1076: if (!strcmp(name, bs->device_name))
1077: return bs;
1078: }
1079: return NULL;
1080: }
1081:
1.1.1.8 root 1082: void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1.1 root 1083: {
1084: BlockDriverState *bs;
1085:
1086: for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1.1.1.8 root 1087: it(opaque, bs);
1.1 root 1088: }
1089: }
1090:
1091: const char *bdrv_get_device_name(BlockDriverState *bs)
1092: {
1093: return bs->device_name;
1094: }
1095:
1.1.1.4 root 1096: void bdrv_flush(BlockDriverState *bs)
1097: {
1.1.1.13 root 1098: if (!bs->drv)
1099: return;
1.1.1.4 root 1100: if (bs->drv->bdrv_flush)
1101: bs->drv->bdrv_flush(bs);
1102: if (bs->backing_hd)
1103: bdrv_flush(bs->backing_hd);
1104: }
1105:
1.1.1.7 root 1106: void bdrv_flush_all(void)
1107: {
1108: BlockDriverState *bs;
1109:
1110: for (bs = bdrv_first; bs != NULL; bs = bs->next)
1111: if (bs->drv && !bdrv_is_read_only(bs) &&
1112: (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1113: bdrv_flush(bs);
1114: }
1115:
1116: /*
1117: * Returns true iff the specified sector is present in the disk image. Drivers
1118: * not implementing the functionality are assumed to not support backing files,
1119: * hence all their sectors are reported as allocated.
1120: *
1121: * 'pnum' is set to the number of sectors (including and immediately following
1122: * the specified sector) that are known to be in the same
1123: * allocated/unallocated state.
1124: *
1125: * 'nb_sectors' is the max value 'pnum' should be set to.
1126: */
1127: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1128: int *pnum)
1129: {
1130: int64_t n;
1131: if (!bs->drv->bdrv_is_allocated) {
1132: if (sector_num >= bs->total_sectors) {
1133: *pnum = 0;
1134: return 0;
1135: }
1136: n = bs->total_sectors - sector_num;
1137: *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1138: return 1;
1139: }
1140: return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1141: }
1142:
1.1.1.14! root 1143: static void bdrv_print_dict(QObject *obj, void *opaque)
1.1 root 1144: {
1.1.1.14! root 1145: QDict *bs_dict;
! 1146: Monitor *mon = opaque;
! 1147:
! 1148: bs_dict = qobject_to_qdict(obj);
! 1149:
! 1150: monitor_printf(mon, "%s: type=%s removable=%d",
! 1151: qdict_get_str(bs_dict, "device"),
! 1152: qdict_get_str(bs_dict, "type"),
! 1153: qdict_get_bool(bs_dict, "removable"));
! 1154:
! 1155: if (qdict_get_bool(bs_dict, "removable")) {
! 1156: monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
! 1157: }
! 1158:
! 1159: if (qdict_haskey(bs_dict, "inserted")) {
! 1160: QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
! 1161:
! 1162: monitor_printf(mon, " file=");
! 1163: monitor_print_filename(mon, qdict_get_str(qdict, "file"));
! 1164: if (qdict_haskey(qdict, "backing_file")) {
! 1165: monitor_printf(mon, " backing_file=");
! 1166: monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
! 1167: }
! 1168: monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
! 1169: qdict_get_bool(qdict, "ro"),
! 1170: qdict_get_str(qdict, "drv"),
! 1171: qdict_get_bool(qdict, "encrypted"));
! 1172: } else {
! 1173: monitor_printf(mon, " [not inserted]");
! 1174: }
! 1175:
! 1176: monitor_printf(mon, "\n");
! 1177: }
! 1178:
! 1179: void bdrv_info_print(Monitor *mon, const QObject *data)
! 1180: {
! 1181: qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
! 1182: }
! 1183:
! 1184: /**
! 1185: * bdrv_info(): Block devices information
! 1186: *
! 1187: * Each block device information is stored in a QDict and the
! 1188: * returned QObject is a QList of all devices.
! 1189: *
! 1190: * The QDict contains the following:
! 1191: *
! 1192: * - "device": device name
! 1193: * - "type": device type
! 1194: * - "removable": true if the device is removable, false otherwise
! 1195: * - "locked": true if the device is locked, false otherwise
! 1196: * - "inserted": only present if the device is inserted, it is a QDict
! 1197: * containing the following:
! 1198: * - "file": device file name
! 1199: * - "ro": true if read-only, false otherwise
! 1200: * - "drv": driver format name
! 1201: * - "backing_file": backing file name if one is used
! 1202: * - "encrypted": true if encrypted, false otherwise
! 1203: *
! 1204: * Example:
! 1205: *
! 1206: * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
! 1207: * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
! 1208: * { "device": "floppy0", "type": "floppy", "removable": true,
! 1209: * "locked": false } ]
! 1210: */
! 1211: void bdrv_info(Monitor *mon, QObject **ret_data)
! 1212: {
! 1213: QList *bs_list;
1.1 root 1214: BlockDriverState *bs;
1215:
1.1.1.14! root 1216: bs_list = qlist_new();
! 1217:
1.1 root 1218: for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1.1.1.14! root 1219: QObject *bs_obj;
! 1220: const char *type = "unknown";
! 1221:
1.1 root 1222: switch(bs->type) {
1223: case BDRV_TYPE_HD:
1.1.1.14! root 1224: type = "hd";
1.1 root 1225: break;
1226: case BDRV_TYPE_CDROM:
1.1.1.14! root 1227: type = "cdrom";
1.1 root 1228: break;
1229: case BDRV_TYPE_FLOPPY:
1.1.1.14! root 1230: type = "floppy";
1.1 root 1231: break;
1232: }
1.1.1.14! root 1233:
! 1234: bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
! 1235: "'removable': %i, 'locked': %i }",
! 1236: bs->device_name, type, bs->removable,
! 1237: bs->locked);
! 1238: assert(bs_obj != NULL);
! 1239:
1.1.1.5 root 1240: if (bs->drv) {
1.1.1.14! root 1241: QObject *obj;
! 1242: QDict *bs_dict = qobject_to_qdict(bs_obj);
! 1243:
! 1244: obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
! 1245: "'encrypted': %i }",
! 1246: bs->filename, bs->read_only,
! 1247: bs->drv->format_name,
! 1248: bdrv_is_encrypted(bs));
! 1249: assert(obj != NULL);
1.1.1.5 root 1250: if (bs->backing_file[0] != '\0') {
1.1.1.14! root 1251: QDict *qdict = qobject_to_qdict(obj);
! 1252: qdict_put(qdict, "backing_file",
! 1253: qstring_from_str(bs->backing_file));
1.1.1.13 root 1254: }
1.1.1.14! root 1255:
! 1256: qdict_put_obj(bs_dict, "inserted", obj);
1.1 root 1257: }
1.1.1.14! root 1258: qlist_append_obj(bs_list, bs_obj);
1.1 root 1259: }
1.1.1.14! root 1260:
! 1261: *ret_data = QOBJECT(bs_list);
! 1262: }
! 1263:
! 1264: static void bdrv_stats_iter(QObject *data, void *opaque)
! 1265: {
! 1266: QDict *qdict;
! 1267: Monitor *mon = opaque;
! 1268:
! 1269: qdict = qobject_to_qdict(data);
! 1270: monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
! 1271:
! 1272: qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
! 1273: monitor_printf(mon, " rd_bytes=%" PRId64
! 1274: " wr_bytes=%" PRId64
! 1275: " rd_operations=%" PRId64
! 1276: " wr_operations=%" PRId64
! 1277: "\n",
! 1278: qdict_get_int(qdict, "rd_bytes"),
! 1279: qdict_get_int(qdict, "wr_bytes"),
! 1280: qdict_get_int(qdict, "rd_operations"),
! 1281: qdict_get_int(qdict, "wr_operations"));
! 1282: }
! 1283:
! 1284: void bdrv_stats_print(Monitor *mon, const QObject *data)
! 1285: {
! 1286: qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1.1 root 1287: }
1288:
1.1.1.14! root 1289: /**
! 1290: * bdrv_info_stats(): show block device statistics
! 1291: *
! 1292: * Each device statistic information is stored in a QDict and
! 1293: * the returned QObject is a QList of all devices.
! 1294: *
! 1295: * The QDict contains the following:
! 1296: *
! 1297: * - "device": device name
! 1298: * - "stats": A QDict with the statistics information, it contains:
! 1299: * - "rd_bytes": bytes read
! 1300: * - "wr_bytes": bytes written
! 1301: * - "rd_operations": read operations
! 1302: * - "wr_operations": write operations
! 1303: *
! 1304: * Example:
! 1305: *
! 1306: * [ { "device": "ide0-hd0",
! 1307: * "stats": { "rd_bytes": 512,
! 1308: * "wr_bytes": 0,
! 1309: * "rd_operations": 1,
! 1310: * "wr_operations": 0 } },
! 1311: * { "device": "ide1-cd0",
! 1312: * "stats": { "rd_bytes": 0,
! 1313: * "wr_bytes": 0,
! 1314: * "rd_operations": 0,
! 1315: * "wr_operations": 0 } } ]
! 1316: */
! 1317: void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1.1.1.6 root 1318: {
1.1.1.14! root 1319: QObject *obj;
! 1320: QList *devices;
1.1.1.6 root 1321: BlockDriverState *bs;
1322:
1.1.1.14! root 1323: devices = qlist_new();
! 1324:
1.1.1.6 root 1325: for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1.1.1.14! root 1326: obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
! 1327: "'rd_bytes': %" PRId64 ","
! 1328: "'wr_bytes': %" PRId64 ","
! 1329: "'rd_operations': %" PRId64 ","
! 1330: "'wr_operations': %" PRId64
! 1331: "} }",
! 1332: bs->device_name,
! 1333: bs->rd_bytes, bs->wr_bytes,
! 1334: bs->rd_ops, bs->wr_ops);
! 1335: assert(obj != NULL);
! 1336: qlist_append_obj(devices, obj);
1.1.1.6 root 1337: }
1.1.1.14! root 1338:
! 1339: *ret_data = QOBJECT(devices);
1.1.1.6 root 1340: }
1341:
1.1.1.8 root 1342: const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1343: {
1344: if (bs->backing_hd && bs->backing_hd->encrypted)
1345: return bs->backing_file;
1346: else if (bs->encrypted)
1347: return bs->filename;
1348: else
1349: return NULL;
1350: }
1351:
1.1.1.6 root 1352: void bdrv_get_backing_filename(BlockDriverState *bs,
1.1.1.5 root 1353: char *filename, int filename_size)
1354: {
1355: if (!bs->backing_hd) {
1356: pstrcpy(filename, filename_size, "");
1357: } else {
1358: pstrcpy(filename, filename_size, bs->backing_file);
1359: }
1360: }
1361:
1.1.1.6 root 1362: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 1363: const uint8_t *buf, int nb_sectors)
1364: {
1365: BlockDriver *drv = bs->drv;
1366: if (!drv)
1367: return -ENOMEDIUM;
1368: if (!drv->bdrv_write_compressed)
1369: return -ENOTSUP;
1.1.1.11 root 1370: if (bdrv_check_request(bs, sector_num, nb_sectors))
1371: return -EIO;
1.1.1.14! root 1372:
! 1373: if (bs->dirty_bitmap) {
! 1374: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
! 1375: }
! 1376:
1.1.1.5 root 1377: return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1378: }
1.1.1.6 root 1379:
1.1.1.5 root 1380: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1381: {
1382: BlockDriver *drv = bs->drv;
1383: if (!drv)
1384: return -ENOMEDIUM;
1385: if (!drv->bdrv_get_info)
1386: return -ENOTSUP;
1387: memset(bdi, 0, sizeof(*bdi));
1388: return drv->bdrv_get_info(bs, bdi);
1389: }
1390:
1.1.1.13 root 1391: int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1392: int64_t pos, int size)
1.1.1.9 root 1393: {
1394: BlockDriver *drv = bs->drv;
1395: if (!drv)
1396: return -ENOMEDIUM;
1.1.1.13 root 1397: if (!drv->bdrv_save_vmstate)
1.1.1.9 root 1398: return -ENOTSUP;
1.1.1.13 root 1399: return drv->bdrv_save_vmstate(bs, buf, pos, size);
1.1.1.9 root 1400: }
1401:
1.1.1.13 root 1402: int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1403: int64_t pos, int size)
1.1.1.9 root 1404: {
1405: BlockDriver *drv = bs->drv;
1406: if (!drv)
1407: return -ENOMEDIUM;
1.1.1.13 root 1408: if (!drv->bdrv_load_vmstate)
1.1.1.9 root 1409: return -ENOTSUP;
1.1.1.13 root 1410: return drv->bdrv_load_vmstate(bs, buf, pos, size);
1.1.1.9 root 1411: }
1412:
1.1 root 1413: /**************************************************************/
1.1.1.5 root 1414: /* handling of snapshots */
1.1 root 1415:
1.1.1.6 root 1416: int bdrv_snapshot_create(BlockDriverState *bs,
1.1.1.5 root 1417: QEMUSnapshotInfo *sn_info)
1418: {
1419: BlockDriver *drv = bs->drv;
1420: if (!drv)
1421: return -ENOMEDIUM;
1422: if (!drv->bdrv_snapshot_create)
1423: return -ENOTSUP;
1424: return drv->bdrv_snapshot_create(bs, sn_info);
1425: }
1.1 root 1426:
1.1.1.6 root 1427: int bdrv_snapshot_goto(BlockDriverState *bs,
1.1.1.5 root 1428: const char *snapshot_id)
1.1 root 1429: {
1.1.1.5 root 1430: BlockDriver *drv = bs->drv;
1431: if (!drv)
1432: return -ENOMEDIUM;
1433: if (!drv->bdrv_snapshot_goto)
1434: return -ENOTSUP;
1435: return drv->bdrv_snapshot_goto(bs, snapshot_id);
1.1 root 1436: }
1437:
1.1.1.5 root 1438: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1.1 root 1439: {
1.1.1.5 root 1440: BlockDriver *drv = bs->drv;
1441: if (!drv)
1442: return -ENOMEDIUM;
1443: if (!drv->bdrv_snapshot_delete)
1444: return -ENOTSUP;
1445: return drv->bdrv_snapshot_delete(bs, snapshot_id);
1446: }
1.1 root 1447:
1.1.1.6 root 1448: int bdrv_snapshot_list(BlockDriverState *bs,
1.1.1.5 root 1449: QEMUSnapshotInfo **psn_info)
1450: {
1451: BlockDriver *drv = bs->drv;
1452: if (!drv)
1453: return -ENOMEDIUM;
1454: if (!drv->bdrv_snapshot_list)
1455: return -ENOTSUP;
1456: return drv->bdrv_snapshot_list(bs, psn_info);
1457: }
1458:
1459: #define NB_SUFFIXES 4
1460:
1461: char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1462: {
1463: static const char suffixes[NB_SUFFIXES] = "KMGT";
1464: int64_t base;
1465: int i;
1466:
1467: if (size <= 999) {
1468: snprintf(buf, buf_size, "%" PRId64, size);
1469: } else {
1470: base = 1024;
1471: for(i = 0; i < NB_SUFFIXES; i++) {
1472: if (size < (10 * base)) {
1.1.1.6 root 1473: snprintf(buf, buf_size, "%0.1f%c",
1.1.1.5 root 1474: (double)size / base,
1475: suffixes[i]);
1476: break;
1477: } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1.1.1.6 root 1478: snprintf(buf, buf_size, "%" PRId64 "%c",
1.1.1.5 root 1479: ((size + (base >> 1)) / base),
1480: suffixes[i]);
1481: break;
1482: }
1483: base = base * 1024;
1484: }
1.1 root 1485: }
1.1.1.5 root 1486: return buf;
1487: }
1488:
1489: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1490: {
1491: char buf1[128], date_buf[128], clock_buf[128];
1492: #ifdef _WIN32
1493: struct tm *ptm;
1.1.1.2 root 1494: #else
1.1.1.5 root 1495: struct tm tm;
1.1.1.2 root 1496: #endif
1.1.1.5 root 1497: time_t ti;
1498: int64_t secs;
1499:
1500: if (!sn) {
1.1.1.6 root 1501: snprintf(buf, buf_size,
1502: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 1503: "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1504: } else {
1505: ti = sn->date_sec;
1.1 root 1506: #ifdef _WIN32
1.1.1.5 root 1507: ptm = localtime(&ti);
1508: strftime(date_buf, sizeof(date_buf),
1509: "%Y-%m-%d %H:%M:%S", ptm);
1510: #else
1511: localtime_r(&ti, &tm);
1512: strftime(date_buf, sizeof(date_buf),
1513: "%Y-%m-%d %H:%M:%S", &tm);
1.1 root 1514: #endif
1.1.1.5 root 1515: secs = sn->vm_clock_nsec / 1000000000;
1516: snprintf(clock_buf, sizeof(clock_buf),
1517: "%02d:%02d:%02d.%03d",
1518: (int)(secs / 3600),
1519: (int)((secs / 60) % 60),
1.1.1.6 root 1520: (int)(secs % 60),
1.1.1.5 root 1521: (int)((sn->vm_clock_nsec / 1000000) % 1000));
1522: snprintf(buf, buf_size,
1.1.1.6 root 1523: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 1524: sn->id_str, sn->name,
1525: get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1526: date_buf,
1527: clock_buf);
1528: }
1529: return buf;
1.1 root 1530: }
1531:
1532:
1.1.1.5 root 1533: /**************************************************************/
1534: /* async I/Os */
1535:
1.1.1.7 root 1536: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1.1.1.13 root 1537: QEMUIOVector *qiov, int nb_sectors,
1.1.1.7 root 1538: BlockDriverCompletionFunc *cb, void *opaque)
1539: {
1.1.1.5 root 1540: BlockDriver *drv = bs->drv;
1.1.1.6 root 1541: BlockDriverAIOCB *ret;
1.1.1.5 root 1542:
1543: if (!drv)
1544: return NULL;
1.1.1.7 root 1545: if (bdrv_check_request(bs, sector_num, nb_sectors))
1546: return NULL;
1.1.1.5 root 1547:
1.1.1.13 root 1548: ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1549: cb, opaque);
1.1.1.6 root 1550:
1551: if (ret) {
1552: /* Update stats even though technically transfer has not happened. */
1.1.1.14! root 1553: bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6 root 1554: bs->rd_ops ++;
1555: }
1556:
1557: return ret;
1.1 root 1558: }
1559:
1.1.1.13 root 1560: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1561: QEMUIOVector *qiov, int nb_sectors,
1562: BlockDriverCompletionFunc *cb, void *opaque)
1.1 root 1563: {
1.1.1.5 root 1564: BlockDriver *drv = bs->drv;
1.1.1.6 root 1565: BlockDriverAIOCB *ret;
1.1 root 1566:
1.1.1.5 root 1567: if (!drv)
1568: return NULL;
1569: if (bs->read_only)
1570: return NULL;
1.1.1.7 root 1571: if (bdrv_check_request(bs, sector_num, nb_sectors))
1572: return NULL;
1.1.1.4 root 1573:
1.1.1.14! root 1574: if (bs->dirty_bitmap) {
! 1575: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
! 1576: }
! 1577:
1.1.1.13 root 1578: ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1579: cb, opaque);
1.1.1.6 root 1580:
1581: if (ret) {
1582: /* Update stats even though technically transfer has not happened. */
1.1.1.14! root 1583: bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6 root 1584: bs->wr_ops ++;
1585: }
1586:
1587: return ret;
1.1.1.5 root 1588: }
1589:
1.1.1.14! root 1590:
! 1591: typedef struct MultiwriteCB {
! 1592: int error;
! 1593: int num_requests;
! 1594: int num_callbacks;
! 1595: struct {
! 1596: BlockDriverCompletionFunc *cb;
! 1597: void *opaque;
! 1598: QEMUIOVector *free_qiov;
! 1599: void *free_buf;
! 1600: } callbacks[];
! 1601: } MultiwriteCB;
! 1602:
! 1603: static void multiwrite_user_cb(MultiwriteCB *mcb)
! 1604: {
! 1605: int i;
! 1606:
! 1607: for (i = 0; i < mcb->num_callbacks; i++) {
! 1608: mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
! 1609: qemu_free(mcb->callbacks[i].free_qiov);
! 1610: qemu_free(mcb->callbacks[i].free_buf);
! 1611: }
! 1612: }
! 1613:
! 1614: static void multiwrite_cb(void *opaque, int ret)
! 1615: {
! 1616: MultiwriteCB *mcb = opaque;
! 1617:
! 1618: if (ret < 0) {
! 1619: mcb->error = ret;
! 1620: multiwrite_user_cb(mcb);
! 1621: }
! 1622:
! 1623: mcb->num_requests--;
! 1624: if (mcb->num_requests == 0) {
! 1625: if (mcb->error == 0) {
! 1626: multiwrite_user_cb(mcb);
! 1627: }
! 1628: qemu_free(mcb);
! 1629: }
! 1630: }
! 1631:
! 1632: static int multiwrite_req_compare(const void *a, const void *b)
! 1633: {
! 1634: return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
! 1635: }
! 1636:
! 1637: /*
! 1638: * Takes a bunch of requests and tries to merge them. Returns the number of
! 1639: * requests that remain after merging.
! 1640: */
! 1641: static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
! 1642: int num_reqs, MultiwriteCB *mcb)
! 1643: {
! 1644: int i, outidx;
! 1645:
! 1646: // Sort requests by start sector
! 1647: qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
! 1648:
! 1649: // Check if adjacent requests touch the same clusters. If so, combine them,
! 1650: // filling up gaps with zero sectors.
! 1651: outidx = 0;
! 1652: for (i = 1; i < num_reqs; i++) {
! 1653: int merge = 0;
! 1654: int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
! 1655:
! 1656: // This handles the cases that are valid for all block drivers, namely
! 1657: // exactly sequential writes and overlapping writes.
! 1658: if (reqs[i].sector <= oldreq_last) {
! 1659: merge = 1;
! 1660: }
! 1661:
! 1662: // The block driver may decide that it makes sense to combine requests
! 1663: // even if there is a gap of some sectors between them. In this case,
! 1664: // the gap is filled with zeros (therefore only applicable for yet
! 1665: // unused space in format like qcow2).
! 1666: if (!merge && bs->drv->bdrv_merge_requests) {
! 1667: merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
! 1668: }
! 1669:
! 1670: if (merge) {
! 1671: size_t size;
! 1672: QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
! 1673: qemu_iovec_init(qiov,
! 1674: reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
! 1675:
! 1676: // Add the first request to the merged one. If the requests are
! 1677: // overlapping, drop the last sectors of the first request.
! 1678: size = (reqs[i].sector - reqs[outidx].sector) << 9;
! 1679: qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
! 1680:
! 1681: // We might need to add some zeros between the two requests
! 1682: if (reqs[i].sector > oldreq_last) {
! 1683: size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
! 1684: uint8_t *buf = qemu_blockalign(bs, zero_bytes);
! 1685: memset(buf, 0, zero_bytes);
! 1686: qemu_iovec_add(qiov, buf, zero_bytes);
! 1687: mcb->callbacks[i].free_buf = buf;
! 1688: }
! 1689:
! 1690: // Add the second request
! 1691: qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
! 1692:
! 1693: reqs[outidx].nb_sectors += reqs[i].nb_sectors;
! 1694: reqs[outidx].qiov = qiov;
! 1695:
! 1696: mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
! 1697: } else {
! 1698: outidx++;
! 1699: reqs[outidx].sector = reqs[i].sector;
! 1700: reqs[outidx].nb_sectors = reqs[i].nb_sectors;
! 1701: reqs[outidx].qiov = reqs[i].qiov;
! 1702: }
! 1703: }
! 1704:
! 1705: return outidx + 1;
! 1706: }
! 1707:
! 1708: /*
! 1709: * Submit multiple AIO write requests at once.
! 1710: *
! 1711: * On success, the function returns 0 and all requests in the reqs array have
! 1712: * been submitted. In error case this function returns -1, and any of the
! 1713: * requests may or may not be submitted yet. In particular, this means that the
! 1714: * callback will be called for some of the requests, for others it won't. The
! 1715: * caller must check the error field of the BlockRequest to wait for the right
! 1716: * callbacks (if error != 0, no callback will be called).
! 1717: *
! 1718: * The implementation may modify the contents of the reqs array, e.g. to merge
! 1719: * requests. However, the fields opaque and error are left unmodified as they
! 1720: * are used to signal failure for a single request to the caller.
! 1721: */
! 1722: int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
! 1723: {
! 1724: BlockDriverAIOCB *acb;
! 1725: MultiwriteCB *mcb;
! 1726: int i;
! 1727:
! 1728: if (num_reqs == 0) {
! 1729: return 0;
! 1730: }
! 1731:
! 1732: // Create MultiwriteCB structure
! 1733: mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
! 1734: mcb->num_requests = 0;
! 1735: mcb->num_callbacks = num_reqs;
! 1736:
! 1737: for (i = 0; i < num_reqs; i++) {
! 1738: mcb->callbacks[i].cb = reqs[i].cb;
! 1739: mcb->callbacks[i].opaque = reqs[i].opaque;
! 1740: }
! 1741:
! 1742: // Check for mergable requests
! 1743: num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
! 1744:
! 1745: // Run the aio requests
! 1746: for (i = 0; i < num_reqs; i++) {
! 1747: acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
! 1748: reqs[i].nb_sectors, multiwrite_cb, mcb);
! 1749:
! 1750: if (acb == NULL) {
! 1751: // We can only fail the whole thing if no request has been
! 1752: // submitted yet. Otherwise we'll wait for the submitted AIOs to
! 1753: // complete and report the error in the callback.
! 1754: if (mcb->num_requests == 0) {
! 1755: reqs[i].error = EIO;
! 1756: goto fail;
! 1757: } else {
! 1758: mcb->error = EIO;
! 1759: break;
! 1760: }
! 1761: } else {
! 1762: mcb->num_requests++;
! 1763: }
! 1764: }
! 1765:
! 1766: return 0;
! 1767:
! 1768: fail:
! 1769: free(mcb);
! 1770: return -1;
! 1771: }
! 1772:
! 1773: BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
! 1774: BlockDriverCompletionFunc *cb, void *opaque)
! 1775: {
! 1776: BlockDriver *drv = bs->drv;
! 1777:
! 1778: if (!drv)
! 1779: return NULL;
! 1780:
! 1781: /*
! 1782: * Note that unlike bdrv_flush the driver is reponsible for flushing a
! 1783: * backing image if it exists.
! 1784: */
! 1785: return drv->bdrv_aio_flush(bs, cb, opaque);
! 1786: }
! 1787:
1.1.1.5 root 1788: void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1.1.1.4 root 1789: {
1.1.1.10 root 1790: acb->pool->cancel(acb);
1.1.1.5 root 1791: }
1.1.1.4 root 1792:
1793:
1.1.1.5 root 1794: /**************************************************************/
1795: /* async block device emulation */
1.1.1.4 root 1796:
1.1.1.13 root 1797: typedef struct BlockDriverAIOCBSync {
1798: BlockDriverAIOCB common;
1799: QEMUBH *bh;
1800: int ret;
1801: /* vector translation state */
1802: QEMUIOVector *qiov;
1803: uint8_t *bounce;
1804: int is_write;
1805: } BlockDriverAIOCBSync;
1806:
1807: static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1808: {
1809: BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1810: qemu_bh_delete(acb->bh);
1811: acb->bh = NULL;
1812: qemu_aio_release(acb);
1813: }
1814:
1815: static AIOPool bdrv_em_aio_pool = {
1816: .aiocb_size = sizeof(BlockDriverAIOCBSync),
1817: .cancel = bdrv_aio_cancel_em,
1818: };
1819:
1.1.1.5 root 1820: static void bdrv_aio_bh_cb(void *opaque)
1.1.1.4 root 1821: {
1.1.1.5 root 1822: BlockDriverAIOCBSync *acb = opaque;
1.1.1.13 root 1823:
1824: if (!acb->is_write)
1825: qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1826: qemu_vfree(acb->bounce);
1.1.1.5 root 1827: acb->common.cb(acb->common.opaque, acb->ret);
1.1.1.13 root 1828: qemu_bh_delete(acb->bh);
1829: acb->bh = NULL;
1.1.1.5 root 1830: qemu_aio_release(acb);
1.1.1.4 root 1831: }
1832:
1.1.1.13 root 1833: static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1834: int64_t sector_num,
1835: QEMUIOVector *qiov,
1836: int nb_sectors,
1837: BlockDriverCompletionFunc *cb,
1838: void *opaque,
1839: int is_write)
1840:
1.1 root 1841: {
1.1.1.5 root 1842: BlockDriverAIOCBSync *acb;
1.1 root 1843:
1.1.1.13 root 1844: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
1845: acb->is_write = is_write;
1846: acb->qiov = qiov;
1847: acb->bounce = qemu_blockalign(bs, qiov->size);
1848:
1.1.1.5 root 1849: if (!acb->bh)
1850: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1.1.1.13 root 1851:
1852: if (is_write) {
1853: qemu_iovec_to_buffer(acb->qiov, acb->bounce);
1854: acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
1855: } else {
1856: acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
1857: }
1858:
1.1.1.5 root 1859: qemu_bh_schedule(acb->bh);
1.1.1.13 root 1860:
1.1.1.5 root 1861: return &acb->common;
1862: }
1.1 root 1863:
1.1.1.13 root 1864: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
1865: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 1866: BlockDriverCompletionFunc *cb, void *opaque)
1867: {
1.1.1.13 root 1868: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1.1.1.5 root 1869: }
1870:
1.1.1.13 root 1871: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
1872: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1873: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 1874: {
1.1.1.13 root 1875: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1.1 root 1876: }
1877:
1.1.1.14! root 1878: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
! 1879: BlockDriverCompletionFunc *cb, void *opaque)
! 1880: {
! 1881: BlockDriverAIOCBSync *acb;
! 1882:
! 1883: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
! 1884: acb->is_write = 1; /* don't bounce in the completion hadler */
! 1885: acb->qiov = NULL;
! 1886: acb->bounce = NULL;
! 1887: acb->ret = 0;
! 1888:
! 1889: if (!acb->bh)
! 1890: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
! 1891:
! 1892: bdrv_flush(bs);
! 1893: qemu_bh_schedule(acb->bh);
! 1894: return &acb->common;
! 1895: }
! 1896:
1.1.1.5 root 1897: /**************************************************************/
1898: /* sync block device emulation */
1899:
1900: static void bdrv_rw_em_cb(void *opaque, int ret)
1.1.1.4 root 1901: {
1.1.1.5 root 1902: *(int *)opaque = ret;
1.1.1.4 root 1903: }
1904:
1.1.1.5 root 1905: #define NOT_DONE 0x7fffffff
1906:
1.1.1.6 root 1907: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 1908: uint8_t *buf, int nb_sectors)
1909: {
1910: int async_ret;
1911: BlockDriverAIOCB *acb;
1.1.1.13 root 1912: struct iovec iov;
1913: QEMUIOVector qiov;
1.1.1.5 root 1914:
1.1.1.14! root 1915: async_context_push();
! 1916:
1.1.1.5 root 1917: async_ret = NOT_DONE;
1.1.1.13 root 1918: iov.iov_base = (void *)buf;
1919: iov.iov_len = nb_sectors * 512;
1920: qemu_iovec_init_external(&qiov, &iov, 1);
1921: acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
1922: bdrv_rw_em_cb, &async_ret);
1.1.1.14! root 1923: if (acb == NULL) {
! 1924: async_ret = -1;
! 1925: goto fail;
! 1926: }
1.1.1.7 root 1927:
1.1.1.5 root 1928: while (async_ret == NOT_DONE) {
1929: qemu_aio_wait();
1930: }
1.1.1.7 root 1931:
1.1.1.14! root 1932:
! 1933: fail:
! 1934: async_context_pop();
1.1.1.5 root 1935: return async_ret;
1936: }
1937:
1938: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1939: const uint8_t *buf, int nb_sectors)
1940: {
1941: int async_ret;
1942: BlockDriverAIOCB *acb;
1.1.1.13 root 1943: struct iovec iov;
1944: QEMUIOVector qiov;
1.1.1.5 root 1945:
1.1.1.14! root 1946: async_context_push();
! 1947:
1.1.1.5 root 1948: async_ret = NOT_DONE;
1.1.1.13 root 1949: iov.iov_base = (void *)buf;
1950: iov.iov_len = nb_sectors * 512;
1951: qemu_iovec_init_external(&qiov, &iov, 1);
1952: acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
1953: bdrv_rw_em_cb, &async_ret);
1.1.1.14! root 1954: if (acb == NULL) {
! 1955: async_ret = -1;
! 1956: goto fail;
! 1957: }
1.1.1.5 root 1958: while (async_ret == NOT_DONE) {
1959: qemu_aio_wait();
1960: }
1.1.1.14! root 1961:
! 1962: fail:
! 1963: async_context_pop();
1.1.1.5 root 1964: return async_ret;
1965: }
1.1 root 1966:
1967: void bdrv_init(void)
1968: {
1.1.1.13 root 1969: module_call_init(MODULE_INIT_BLOCK);
1.1.1.10 root 1970: }
1971:
1.1.1.14! root 1972: void bdrv_init_with_whitelist(void)
! 1973: {
! 1974: use_bdrv_whitelist = 1;
! 1975: bdrv_init();
! 1976: }
! 1977:
1.1.1.13 root 1978: void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
1979: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 1980: {
1981: BlockDriverAIOCB *acb;
1982:
1.1.1.10 root 1983: if (pool->free_aiocb) {
1984: acb = pool->free_aiocb;
1985: pool->free_aiocb = acb->next;
1.1.1.5 root 1986: } else {
1.1.1.10 root 1987: acb = qemu_mallocz(pool->aiocb_size);
1988: acb->pool = pool;
1.1.1.5 root 1989: }
1990: acb->bs = bs;
1991: acb->cb = cb;
1992: acb->opaque = opaque;
1993: return acb;
1994: }
1995:
1996: void qemu_aio_release(void *p)
1997: {
1.1.1.10 root 1998: BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
1999: AIOPool *pool = acb->pool;
2000: acb->next = pool->free_aiocb;
2001: pool->free_aiocb = acb;
1.1.1.5 root 2002: }
2003:
2004: /**************************************************************/
2005: /* removable device support */
2006:
2007: /**
2008: * Return TRUE if the media is present
2009: */
2010: int bdrv_is_inserted(BlockDriverState *bs)
2011: {
2012: BlockDriver *drv = bs->drv;
2013: int ret;
2014: if (!drv)
2015: return 0;
2016: if (!drv->bdrv_is_inserted)
2017: return 1;
2018: ret = drv->bdrv_is_inserted(bs);
2019: return ret;
2020: }
2021:
2022: /**
2023: * Return TRUE if the media changed since the last call to this
1.1.1.6 root 2024: * function. It is currently only used for floppy disks
1.1.1.5 root 2025: */
2026: int bdrv_media_changed(BlockDriverState *bs)
2027: {
2028: BlockDriver *drv = bs->drv;
2029: int ret;
2030:
2031: if (!drv || !drv->bdrv_media_changed)
2032: ret = -ENOTSUP;
2033: else
2034: ret = drv->bdrv_media_changed(bs);
2035: if (ret == -ENOTSUP)
2036: ret = bs->media_changed;
2037: bs->media_changed = 0;
2038: return ret;
2039: }
2040:
2041: /**
2042: * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2043: */
1.1.1.13 root 2044: int bdrv_eject(BlockDriverState *bs, int eject_flag)
1.1.1.5 root 2045: {
2046: BlockDriver *drv = bs->drv;
2047: int ret;
2048:
1.1.1.13 root 2049: if (bs->locked) {
2050: return -EBUSY;
2051: }
2052:
1.1.1.5 root 2053: if (!drv || !drv->bdrv_eject) {
2054: ret = -ENOTSUP;
2055: } else {
2056: ret = drv->bdrv_eject(bs, eject_flag);
2057: }
2058: if (ret == -ENOTSUP) {
2059: if (eject_flag)
2060: bdrv_close(bs);
1.1.1.13 root 2061: ret = 0;
1.1.1.5 root 2062: }
1.1.1.13 root 2063:
2064: return ret;
1.1.1.5 root 2065: }
2066:
2067: int bdrv_is_locked(BlockDriverState *bs)
2068: {
2069: return bs->locked;
2070: }
2071:
2072: /**
2073: * Lock or unlock the media (if it is locked, the user won't be able
2074: * to eject it manually).
2075: */
2076: void bdrv_set_locked(BlockDriverState *bs, int locked)
2077: {
2078: BlockDriver *drv = bs->drv;
2079:
2080: bs->locked = locked;
2081: if (drv && drv->bdrv_set_locked) {
2082: drv->bdrv_set_locked(bs, locked);
2083: }
1.1 root 2084: }
1.1.1.6 root 2085:
2086: /* needed for generic scsi interface */
2087:
2088: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2089: {
2090: BlockDriver *drv = bs->drv;
2091:
2092: if (drv && drv->bdrv_ioctl)
2093: return drv->bdrv_ioctl(bs, req, buf);
2094: return -ENOTSUP;
2095: }
1.1.1.13 root 2096:
2097: BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2098: unsigned long int req, void *buf,
2099: BlockDriverCompletionFunc *cb, void *opaque)
2100: {
2101: BlockDriver *drv = bs->drv;
2102:
2103: if (drv && drv->bdrv_aio_ioctl)
2104: return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2105: return NULL;
2106: }
2107:
1.1.1.14! root 2108:
! 2109:
1.1.1.13 root 2110: void *qemu_blockalign(BlockDriverState *bs, size_t size)
2111: {
2112: return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2113: }
1.1.1.14! root 2114:
! 2115: void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
! 2116: {
! 2117: int64_t bitmap_size;
! 2118:
! 2119: if (enable) {
! 2120: if (!bs->dirty_bitmap) {
! 2121: bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
! 2122: BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
! 2123: bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
! 2124:
! 2125: bs->dirty_bitmap = qemu_mallocz(bitmap_size);
! 2126: }
! 2127: } else {
! 2128: if (bs->dirty_bitmap) {
! 2129: qemu_free(bs->dirty_bitmap);
! 2130: bs->dirty_bitmap = NULL;
! 2131: }
! 2132: }
! 2133: }
! 2134:
! 2135: int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
! 2136: {
! 2137: int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
! 2138:
! 2139: if (bs->dirty_bitmap &&
! 2140: (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
! 2141: return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
! 2142: (1 << (chunk % (sizeof(unsigned long) * 8)));
! 2143: } else {
! 2144: return 0;
! 2145: }
! 2146: }
! 2147:
! 2148: void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
! 2149: int nr_sectors)
! 2150: {
! 2151: set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
! 2152: }
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