Annotation of qemu/block.c, revision 1.1.1.19
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"
1.1.1.19! root 26: #include "trace.h"
1.1.1.13 root 27: #include "monitor.h"
1.1 root 28: #include "block_int.h"
1.1.1.13 root 29: #include "module.h"
1.1.1.14 root 30: #include "qemu-objects.h"
1.1 root 31:
1.1.1.14 root 32: #ifdef CONFIG_BSD
1.1 root 33: #include <sys/types.h>
34: #include <sys/stat.h>
35: #include <sys/ioctl.h>
1.1.1.14 root 36: #include <sys/queue.h>
1.1.1.13 root 37: #ifndef __DragonFly__
1.1 root 38: #include <sys/disk.h>
39: #endif
1.1.1.13 root 40: #endif
41:
42: #ifdef _WIN32
43: #include <windows.h>
44: #endif
1.1 root 45:
1.1.1.13 root 46: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
47: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 48: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.13 root 49: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
50: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 51: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.14 root 52: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
53: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.18 root 54: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
55: BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.6 root 56: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 57: uint8_t *buf, int nb_sectors);
58: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
59: const uint8_t *buf, int nb_sectors);
1.1.1.3 root 60:
1.1.1.18 root 61: static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
62: QTAILQ_HEAD_INITIALIZER(bdrv_states);
1.1.1.7 root 63:
1.1.1.18 root 64: static QLIST_HEAD(, BlockDriver) bdrv_drivers =
65: QLIST_HEAD_INITIALIZER(bdrv_drivers);
66:
67: /* The device to use for VM snapshots */
68: static BlockDriverState *bs_snapshots;
1.1 root 69:
1.1.1.14 root 70: /* If non-zero, use only whitelisted block drivers */
71: static int use_bdrv_whitelist;
72:
1.1.1.19! root 73: #ifdef _WIN32
! 74: static int is_windows_drive_prefix(const char *filename)
! 75: {
! 76: return (((filename[0] >= 'a' && filename[0] <= 'z') ||
! 77: (filename[0] >= 'A' && filename[0] <= 'Z')) &&
! 78: filename[1] == ':');
! 79: }
! 80:
! 81: int is_windows_drive(const char *filename)
! 82: {
! 83: if (is_windows_drive_prefix(filename) &&
! 84: filename[2] == '\0')
! 85: return 1;
! 86: if (strstart(filename, "\\\\.\\", NULL) ||
! 87: strstart(filename, "//./", NULL))
! 88: return 1;
! 89: return 0;
! 90: }
! 91: #endif
! 92:
! 93: /* check if the path starts with "<protocol>:" */
! 94: static int path_has_protocol(const char *path)
! 95: {
! 96: #ifdef _WIN32
! 97: if (is_windows_drive(path) ||
! 98: is_windows_drive_prefix(path)) {
! 99: return 0;
! 100: }
! 101: #endif
! 102:
! 103: return strchr(path, ':') != NULL;
! 104: }
! 105:
1.1.1.5 root 106: int path_is_absolute(const char *path)
107: {
108: const char *p;
109: #ifdef _WIN32
110: /* specific case for names like: "\\.\d:" */
111: if (*path == '/' || *path == '\\')
112: return 1;
113: #endif
114: p = strchr(path, ':');
115: if (p)
116: p++;
117: else
118: p = path;
119: #ifdef _WIN32
120: return (*p == '/' || *p == '\\');
121: #else
122: return (*p == '/');
123: #endif
1.1.1.2 root 124: }
125:
1.1.1.5 root 126: /* if filename is absolute, just copy it to dest. Otherwise, build a
127: path to it by considering it is relative to base_path. URL are
128: supported. */
129: void path_combine(char *dest, int dest_size,
130: const char *base_path,
131: const char *filename)
132: {
133: const char *p, *p1;
134: int len;
135:
136: if (dest_size <= 0)
137: return;
138: if (path_is_absolute(filename)) {
139: pstrcpy(dest, dest_size, filename);
140: } else {
141: p = strchr(base_path, ':');
142: if (p)
143: p++;
144: else
145: p = base_path;
146: p1 = strrchr(base_path, '/');
147: #ifdef _WIN32
148: {
149: const char *p2;
150: p2 = strrchr(base_path, '\\');
151: if (!p1 || p2 > p1)
152: p1 = p2;
1.1.1.2 root 153: }
1.1.1.5 root 154: #endif
155: if (p1)
156: p1++;
157: else
158: p1 = base_path;
159: if (p1 > p)
160: p = p1;
161: len = p - base_path;
162: if (len > dest_size - 1)
163: len = dest_size - 1;
164: memcpy(dest, base_path, len);
165: dest[len] = '\0';
166: pstrcat(dest, dest_size, filename);
1.1.1.2 root 167: }
168: }
169:
1.1.1.13 root 170: void bdrv_register(BlockDriver *bdrv)
1.1 root 171: {
1.1.1.13 root 172: if (!bdrv->bdrv_aio_readv) {
1.1.1.5 root 173: /* add AIO emulation layer */
1.1.1.13 root 174: bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
175: bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
176: } else if (!bdrv->bdrv_read) {
1.1.1.5 root 177: /* add synchronous IO emulation layer */
178: bdrv->bdrv_read = bdrv_read_em;
179: bdrv->bdrv_write = bdrv_write_em;
180: }
1.1.1.14 root 181:
182: if (!bdrv->bdrv_aio_flush)
183: bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
184:
1.1.1.18 root 185: QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
1.1 root 186: }
187:
188: /* create a new block device (by default it is empty) */
189: BlockDriverState *bdrv_new(const char *device_name)
190: {
1.1.1.18 root 191: BlockDriverState *bs;
1.1 root 192:
193: bs = qemu_mallocz(sizeof(BlockDriverState));
194: pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
195: if (device_name[0] != '\0') {
1.1.1.18 root 196: QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
1.1 root 197: }
198: return bs;
199: }
200:
201: BlockDriver *bdrv_find_format(const char *format_name)
202: {
203: BlockDriver *drv1;
1.1.1.18 root 204: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
205: if (!strcmp(drv1->format_name, format_name)) {
1.1 root 206: return drv1;
1.1.1.18 root 207: }
1.1 root 208: }
209: return NULL;
210: }
211:
1.1.1.14 root 212: static int bdrv_is_whitelisted(BlockDriver *drv)
213: {
214: static const char *whitelist[] = {
215: CONFIG_BDRV_WHITELIST
216: };
217: const char **p;
218:
219: if (!whitelist[0])
220: return 1; /* no whitelist, anything goes */
221:
222: for (p = whitelist; *p; p++) {
223: if (!strcmp(drv->format_name, *p)) {
224: return 1;
225: }
226: }
227: return 0;
228: }
229:
230: BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
231: {
232: BlockDriver *drv = bdrv_find_format(format_name);
233: return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
234: }
235:
1.1.1.13 root 236: int bdrv_create(BlockDriver *drv, const char* filename,
237: QEMUOptionParameter *options)
1.1 root 238: {
239: if (!drv->bdrv_create)
240: return -ENOTSUP;
1.1.1.13 root 241:
242: return drv->bdrv_create(filename, options);
1.1 root 243: }
244:
1.1.1.18 root 245: int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
246: {
247: BlockDriver *drv;
248:
249: drv = bdrv_find_protocol(filename);
250: if (drv == NULL) {
1.1.1.19! root 251: return -ENOENT;
1.1.1.18 root 252: }
253:
254: return bdrv_create(drv, filename, options);
255: }
256:
1.1 root 257: #ifdef _WIN32
1.1.1.2 root 258: void get_tmp_filename(char *filename, int size)
1.1 root 259: {
1.1.1.5 root 260: char temp_dir[MAX_PATH];
1.1.1.6 root 261:
1.1.1.5 root 262: GetTempPath(MAX_PATH, temp_dir);
263: GetTempFileName(temp_dir, "qem", 0, filename);
1.1 root 264: }
265: #else
1.1.1.2 root 266: void get_tmp_filename(char *filename, int size)
1.1 root 267: {
268: int fd;
1.1.1.7 root 269: const char *tmpdir;
1.1 root 270: /* XXX: race condition possible */
1.1.1.7 root 271: tmpdir = getenv("TMPDIR");
272: if (!tmpdir)
273: tmpdir = "/tmp";
274: snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
1.1 root 275: fd = mkstemp(filename);
276: close(fd);
277: }
278: #endif
279:
1.1.1.13 root 280: /*
281: * Detect host devices. By convention, /dev/cdrom[N] is always
282: * recognized as a host CDROM.
283: */
284: static BlockDriver *find_hdev_driver(const char *filename)
285: {
286: int score_max = 0, score;
287: BlockDriver *drv = NULL, *d;
288:
1.1.1.18 root 289: QLIST_FOREACH(d, &bdrv_drivers, list) {
1.1.1.13 root 290: if (d->bdrv_probe_device) {
291: score = d->bdrv_probe_device(filename);
292: if (score > score_max) {
293: score_max = score;
294: drv = d;
295: }
296: }
297: }
298:
299: return drv;
300: }
301:
1.1.1.18 root 302: BlockDriver *bdrv_find_protocol(const char *filename)
303: {
304: BlockDriver *drv1;
305: char protocol[128];
306: int len;
307: const char *p;
308:
309: /* TODO Drivers without bdrv_file_open must be specified explicitly */
310:
311: /*
312: * XXX(hch): we really should not let host device detection
313: * override an explicit protocol specification, but moving this
314: * later breaks access to device names with colons in them.
315: * Thanks to the brain-dead persistent naming schemes on udev-
316: * based Linux systems those actually are quite common.
317: */
318: drv1 = find_hdev_driver(filename);
319: if (drv1) {
320: return drv1;
321: }
322:
1.1.1.19! root 323: if (!path_has_protocol(filename)) {
1.1.1.18 root 324: return bdrv_find_format("file");
325: }
1.1.1.19! root 326: p = strchr(filename, ':');
! 327: assert(p != NULL);
1.1.1.18 root 328: len = p - filename;
329: if (len > sizeof(protocol) - 1)
330: len = sizeof(protocol) - 1;
331: memcpy(protocol, filename, len);
332: protocol[len] = '\0';
333: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
334: if (drv1->protocol_name &&
335: !strcmp(drv1->protocol_name, protocol)) {
336: return drv1;
337: }
338: }
339: return NULL;
340: }
341:
342: static int find_image_format(const char *filename, BlockDriver **pdrv)
1.1 root 343: {
1.1.1.5 root 344: int ret, score, score_max;
1.1 root 345: BlockDriver *drv1, *drv;
1.1.1.5 root 346: uint8_t buf[2048];
347: BlockDriverState *bs;
1.1.1.6 root 348:
1.1.1.18 root 349: ret = bdrv_file_open(&bs, filename, 0);
350: if (ret < 0) {
351: *pdrv = NULL;
352: return ret;
353: }
354:
355: /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
356: if (bs->sg || !bdrv_is_inserted(bs)) {
357: bdrv_delete(bs);
358: drv = bdrv_find_format("raw");
359: if (!drv) {
360: ret = -ENOENT;
361: }
362: *pdrv = drv;
363: return ret;
364: }
1.1.1.5 root 365:
366: ret = bdrv_pread(bs, 0, buf, sizeof(buf));
367: bdrv_delete(bs);
368: if (ret < 0) {
1.1.1.18 root 369: *pdrv = NULL;
370: return ret;
1.1.1.5 root 371: }
372:
1.1 root 373: score_max = 0;
1.1.1.18 root 374: drv = NULL;
375: QLIST_FOREACH(drv1, &bdrv_drivers, list) {
1.1.1.5 root 376: if (drv1->bdrv_probe) {
377: score = drv1->bdrv_probe(buf, ret, filename);
378: if (score > score_max) {
379: score_max = score;
380: drv = drv1;
381: }
1.1 root 382: }
383: }
1.1.1.18 root 384: if (!drv) {
385: ret = -ENOENT;
386: }
387: *pdrv = drv;
388: return ret;
389: }
390:
391: /**
392: * Set the current 'total_sectors' value
393: */
394: static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
395: {
396: BlockDriver *drv = bs->drv;
397:
398: /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
399: if (bs->sg)
400: return 0;
401:
402: /* query actual device if possible, otherwise just trust the hint */
403: if (drv->bdrv_getlength) {
404: int64_t length = drv->bdrv_getlength(bs);
405: if (length < 0) {
406: return length;
407: }
408: hint = length >> BDRV_SECTOR_BITS;
409: }
410:
411: bs->total_sectors = hint;
412: return 0;
413: }
414:
415: /*
416: * Common part for opening disk images and files
417: */
418: static int bdrv_open_common(BlockDriverState *bs, const char *filename,
419: int flags, BlockDriver *drv)
420: {
421: int ret, open_flags;
422:
423: assert(drv != NULL);
424:
425: bs->file = NULL;
426: bs->total_sectors = 0;
427: bs->encrypted = 0;
428: bs->valid_key = 0;
429: bs->open_flags = flags;
430: /* buffer_alignment defaulted to 512, drivers can change this value */
431: bs->buffer_alignment = 512;
432:
433: pstrcpy(bs->filename, sizeof(bs->filename), filename);
434:
435: if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
436: return -ENOTSUP;
437: }
438:
439: bs->drv = drv;
440: bs->opaque = qemu_mallocz(drv->instance_size);
441:
442: /*
443: * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
444: * write cache to the guest. We do need the fdatasync to flush
445: * out transactions for block allocations, and we maybe have a
446: * volatile write cache in our backing device to deal with.
447: */
448: if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
449: bs->enable_write_cache = 1;
450:
451: /*
452: * Clear flags that are internal to the block layer before opening the
453: * image.
454: */
455: open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
456:
457: /*
458: * Snapshots should be writeable.
459: */
460: if (bs->is_temporary) {
461: open_flags |= BDRV_O_RDWR;
462: }
463:
464: /* Open the image, either directly or using a protocol */
465: if (drv->bdrv_file_open) {
466: ret = drv->bdrv_file_open(bs, filename, open_flags);
467: } else {
468: ret = bdrv_file_open(&bs->file, filename, open_flags);
469: if (ret >= 0) {
470: ret = drv->bdrv_open(bs, open_flags);
471: }
472: }
473:
474: if (ret < 0) {
475: goto free_and_fail;
476: }
477:
478: bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
479:
480: ret = refresh_total_sectors(bs, bs->total_sectors);
481: if (ret < 0) {
482: goto free_and_fail;
483: }
484:
485: #ifndef _WIN32
486: if (bs->is_temporary) {
487: unlink(filename);
488: }
489: #endif
490: return 0;
491:
492: free_and_fail:
493: if (bs->file) {
494: bdrv_delete(bs->file);
495: bs->file = NULL;
496: }
497: qemu_free(bs->opaque);
498: bs->opaque = NULL;
499: bs->drv = NULL;
500: return ret;
1.1 root 501: }
502:
1.1.1.18 root 503: /*
504: * Opens a file using a protocol (file, host_device, nbd, ...)
505: */
1.1.1.5 root 506: int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
1.1 root 507: {
1.1.1.5 root 508: BlockDriverState *bs;
1.1.1.18 root 509: BlockDriver *drv;
1.1.1.5 root 510: int ret;
511:
1.1.1.18 root 512: drv = bdrv_find_protocol(filename);
513: if (!drv) {
514: return -ENOENT;
515: }
516:
1.1.1.5 root 517: bs = bdrv_new("");
1.1.1.18 root 518: ret = bdrv_open_common(bs, filename, flags, drv);
1.1.1.5 root 519: if (ret < 0) {
520: bdrv_delete(bs);
521: return ret;
1.1.1.2 root 522: }
1.1.1.7 root 523: bs->growable = 1;
1.1.1.5 root 524: *pbs = bs;
525: return 0;
526: }
527:
1.1.1.18 root 528: /*
529: * Opens a disk image (raw, qcow2, vmdk, ...)
530: */
531: int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
532: BlockDriver *drv)
1.1 root 533: {
1.1.1.18 root 534: int ret;
1.1 root 535:
1.1.1.5 root 536: if (flags & BDRV_O_SNAPSHOT) {
1.1 root 537: BlockDriverState *bs1;
538: int64_t total_size;
1.1.1.7 root 539: int is_protocol = 0;
1.1.1.13 root 540: BlockDriver *bdrv_qcow2;
541: QEMUOptionParameter *options;
1.1.1.18 root 542: char tmp_filename[PATH_MAX];
543: char backing_filename[PATH_MAX];
1.1.1.6 root 544:
1.1 root 545: /* if snapshot, we create a temporary backing file and open it
546: instead of opening 'filename' directly */
547:
548: /* if there is a backing file, use it */
549: bs1 = bdrv_new("");
1.1.1.18 root 550: ret = bdrv_open(bs1, filename, 0, drv);
1.1.1.8 root 551: if (ret < 0) {
1.1 root 552: bdrv_delete(bs1);
1.1.1.8 root 553: return ret;
1.1 root 554: }
1.1.1.18 root 555: total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
1.1.1.7 root 556:
557: if (bs1->drv && bs1->drv->protocol_name)
558: is_protocol = 1;
559:
1.1 root 560: bdrv_delete(bs1);
1.1.1.6 root 561:
1.1 root 562: get_tmp_filename(tmp_filename, sizeof(tmp_filename));
1.1.1.7 root 563:
564: /* Real path is meaningless for protocols */
565: if (is_protocol)
566: snprintf(backing_filename, sizeof(backing_filename),
567: "%s", filename);
1.1.1.18 root 568: else if (!realpath(filename, backing_filename))
569: return -errno;
1.1.1.7 root 570:
1.1.1.13 root 571: bdrv_qcow2 = bdrv_find_format("qcow2");
572: options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
573:
1.1.1.18 root 574: set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
1.1.1.13 root 575: set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
576: if (drv) {
577: set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
578: drv->format_name);
579: }
580:
581: ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
1.1.1.18 root 582: free_option_parameters(options);
1.1.1.8 root 583: if (ret < 0) {
584: return ret;
1.1 root 585: }
1.1.1.13 root 586:
1.1 root 587: filename = tmp_filename;
1.1.1.13 root 588: drv = bdrv_qcow2;
1.1 root 589: bs->is_temporary = 1;
590: }
591:
1.1.1.18 root 592: /* Find the right image format driver */
593: if (!drv) {
594: ret = find_image_format(filename, &drv);
1.1.1.8 root 595: }
1.1.1.18 root 596:
1.1.1.8 root 597: if (!drv) {
598: goto unlink_and_fail;
1.1 root 599: }
1.1.1.14 root 600:
1.1.1.18 root 601: /* Open the image */
602: ret = bdrv_open_common(bs, filename, flags, drv);
1.1 root 603: if (ret < 0) {
1.1.1.18 root 604: goto unlink_and_fail;
1.1 root 605: }
1.1.1.18 root 606:
607: /* If there is a backing file, use it */
608: if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
609: char backing_filename[PATH_MAX];
610: int back_flags;
1.1.1.13 root 611: BlockDriver *back_drv = NULL;
1.1.1.18 root 612:
1.1 root 613: bs->backing_hd = bdrv_new("");
1.1.1.19! root 614:
! 615: if (path_has_protocol(bs->backing_file)) {
! 616: pstrcpy(backing_filename, sizeof(backing_filename),
! 617: bs->backing_file);
! 618: } else {
! 619: path_combine(backing_filename, sizeof(backing_filename),
! 620: filename, bs->backing_file);
! 621: }
! 622:
! 623: if (bs->backing_format[0] != '\0') {
1.1.1.13 root 624: back_drv = bdrv_find_format(bs->backing_format);
1.1.1.19! root 625: }
1.1.1.18 root 626:
627: /* backing files always opened read-only */
628: back_flags =
629: flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
630:
631: ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
1.1.1.8 root 632: if (ret < 0) {
633: bdrv_close(bs);
634: return ret;
635: }
1.1.1.18 root 636: if (bs->is_temporary) {
637: bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
638: } else {
639: /* base image inherits from "parent" */
640: bs->backing_hd->keep_read_only = bs->keep_read_only;
641: }
1.1 root 642: }
643:
1.1.1.13 root 644: if (!bdrv_key_required(bs)) {
645: /* call the change callback */
646: bs->media_changed = 1;
647: if (bs->change_cb)
1.1.1.19! root 648: bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1.1.13 root 649: }
1.1.1.18 root 650:
1.1 root 651: return 0;
1.1.1.18 root 652:
653: unlink_and_fail:
654: if (bs->is_temporary) {
655: unlink(filename);
656: }
657: return ret;
1.1 root 658: }
659:
660: void bdrv_close(BlockDriverState *bs)
661: {
1.1.1.5 root 662: if (bs->drv) {
1.1.1.18 root 663: if (bs == bs_snapshots) {
664: bs_snapshots = NULL;
665: }
666: if (bs->backing_hd) {
1.1 root 667: bdrv_delete(bs->backing_hd);
1.1.1.18 root 668: bs->backing_hd = NULL;
669: }
1.1 root 670: bs->drv->bdrv_close(bs);
671: qemu_free(bs->opaque);
672: #ifdef _WIN32
673: if (bs->is_temporary) {
674: unlink(bs->filename);
675: }
676: #endif
677: bs->opaque = NULL;
678: bs->drv = NULL;
679:
1.1.1.18 root 680: if (bs->file != NULL) {
681: bdrv_close(bs->file);
682: }
683:
1.1 root 684: /* call the change callback */
1.1.1.5 root 685: bs->media_changed = 1;
1.1 root 686: if (bs->change_cb)
1.1.1.19! root 687: bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1 root 688: }
689: }
690:
1.1.1.18 root 691: void bdrv_close_all(void)
692: {
693: BlockDriverState *bs;
694:
695: QTAILQ_FOREACH(bs, &bdrv_states, list) {
696: bdrv_close(bs);
697: }
698: }
699:
1.1 root 700: void bdrv_delete(BlockDriverState *bs)
701: {
1.1.1.18 root 702: assert(!bs->peer);
1.1.1.7 root 703:
1.1.1.18 root 704: /* remove from list, if necessary */
705: if (bs->device_name[0] != '\0') {
706: QTAILQ_REMOVE(&bdrv_states, bs, list);
707: }
1.1.1.7 root 708:
1.1 root 709: bdrv_close(bs);
1.1.1.18 root 710: if (bs->file != NULL) {
711: bdrv_delete(bs->file);
712: }
713:
714: assert(bs != bs_snapshots);
1.1 root 715: qemu_free(bs);
716: }
717:
1.1.1.18 root 718: int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
719: {
720: if (bs->peer) {
721: return -EBUSY;
722: }
723: bs->peer = qdev;
724: return 0;
725: }
726:
727: void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
728: {
729: assert(bs->peer == qdev);
730: bs->peer = NULL;
731: }
732:
733: DeviceState *bdrv_get_attached(BlockDriverState *bs)
734: {
735: return bs->peer;
736: }
737:
1.1.1.13 root 738: /*
739: * Run consistency checks on an image
740: *
1.1.1.18 root 741: * Returns 0 if the check could be completed (it doesn't mean that the image is
742: * free of errors) or -errno when an internal error occured. The results of the
743: * check are stored in res.
1.1.1.13 root 744: */
1.1.1.18 root 745: int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1.1.13 root 746: {
747: if (bs->drv->bdrv_check == NULL) {
748: return -ENOTSUP;
749: }
750:
1.1.1.18 root 751: memset(res, 0, sizeof(*res));
752: return bs->drv->bdrv_check(bs, res);
1.1.1.13 root 753: }
754:
1.1.1.19! root 755: #define COMMIT_BUF_SECTORS 2048
! 756:
1.1 root 757: /* commit COW file into the raw image */
758: int bdrv_commit(BlockDriverState *bs)
759: {
1.1.1.5 root 760: BlockDriver *drv = bs->drv;
1.1.1.18 root 761: BlockDriver *backing_drv;
1.1.1.19! root 762: int64_t sector, total_sectors;
! 763: int n, ro, open_flags;
1.1.1.18 root 764: int ret = 0, rw_ret = 0;
1.1.1.19! root 765: uint8_t *buf;
1.1.1.18 root 766: char filename[1024];
767: BlockDriverState *bs_rw, *bs_ro;
1.1 root 768:
1.1.1.5 root 769: if (!drv)
770: return -ENOMEDIUM;
1.1.1.18 root 771:
772: if (!bs->backing_hd) {
773: return -ENOTSUP;
774: }
1.1 root 775:
1.1.1.18 root 776: if (bs->backing_hd->keep_read_only) {
777: return -EACCES;
1.1 root 778: }
779:
1.1.1.18 root 780: backing_drv = bs->backing_hd->drv;
781: ro = bs->backing_hd->read_only;
782: strncpy(filename, bs->backing_hd->filename, sizeof(filename));
783: open_flags = bs->backing_hd->open_flags;
784:
785: if (ro) {
786: /* re-open as RW */
787: bdrv_delete(bs->backing_hd);
788: bs->backing_hd = NULL;
789: bs_rw = bdrv_new("");
790: rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
791: backing_drv);
792: if (rw_ret < 0) {
793: bdrv_delete(bs_rw);
794: /* try to re-open read-only */
795: bs_ro = bdrv_new("");
796: ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
797: backing_drv);
798: if (ret < 0) {
799: bdrv_delete(bs_ro);
800: /* drive not functional anymore */
801: bs->drv = NULL;
802: return ret;
803: }
804: bs->backing_hd = bs_ro;
805: return rw_ret;
806: }
807: bs->backing_hd = bs_rw;
1.1 root 808: }
809:
1.1.1.14 root 810: total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1.1.19! root 811: buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
1.1 root 812:
1.1.1.19! root 813: for (sector = 0; sector < total_sectors; sector += n) {
! 814: if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
! 815:
! 816: if (bdrv_read(bs, sector, buf, n) != 0) {
! 817: ret = -EIO;
! 818: goto ro_cleanup;
! 819: }
! 820:
! 821: if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
! 822: ret = -EIO;
! 823: goto ro_cleanup;
! 824: }
1.1 root 825: }
826: }
1.1.1.2 root 827:
1.1.1.18 root 828: if (drv->bdrv_make_empty) {
829: ret = drv->bdrv_make_empty(bs);
830: bdrv_flush(bs);
831: }
1.1.1.2 root 832:
1.1.1.18 root 833: /*
834: * Make sure all data we wrote to the backing device is actually
835: * stable on disk.
836: */
837: if (bs->backing_hd)
838: bdrv_flush(bs->backing_hd);
839:
840: ro_cleanup:
1.1.1.19! root 841: qemu_free(buf);
1.1.1.18 root 842:
843: if (ro) {
844: /* re-open as RO */
845: bdrv_delete(bs->backing_hd);
846: bs->backing_hd = NULL;
847: bs_ro = bdrv_new("");
848: ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
849: backing_drv);
850: if (ret < 0) {
851: bdrv_delete(bs_ro);
852: /* drive not functional anymore */
853: bs->drv = NULL;
854: return ret;
855: }
856: bs->backing_hd = bs_ro;
857: bs->backing_hd->keep_read_only = 0;
858: }
859:
860: return ret;
861: }
862:
863: void bdrv_commit_all(void)
864: {
865: BlockDriverState *bs;
866:
867: QTAILQ_FOREACH(bs, &bdrv_states, list) {
868: bdrv_commit(bs);
869: }
870: }
871:
872: /*
873: * Return values:
874: * 0 - success
875: * -EINVAL - backing format specified, but no file
876: * -ENOSPC - can't update the backing file because no space is left in the
877: * image file header
878: * -ENOTSUP - format driver doesn't support changing the backing file
879: */
880: int bdrv_change_backing_file(BlockDriverState *bs,
881: const char *backing_file, const char *backing_fmt)
882: {
883: BlockDriver *drv = bs->drv;
884:
885: if (drv->bdrv_change_backing_file != NULL) {
886: return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
887: } else {
888: return -ENOTSUP;
889: }
1.1 root 890: }
891:
1.1.1.7 root 892: static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
893: size_t size)
894: {
895: int64_t len;
896:
897: if (!bdrv_is_inserted(bs))
898: return -ENOMEDIUM;
899:
900: if (bs->growable)
901: return 0;
902:
903: len = bdrv_getlength(bs);
904:
1.1.1.11 root 905: if (offset < 0)
906: return -EIO;
907:
908: if ((offset > len) || (len - offset < size))
1.1.1.7 root 909: return -EIO;
910:
911: return 0;
912: }
913:
914: static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
915: int nb_sectors)
916: {
1.1.1.18 root 917: return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
918: nb_sectors * BDRV_SECTOR_SIZE);
1.1.1.7 root 919: }
920:
1.1.1.5 root 921: /* return < 0 if error. See bdrv_write() for the return codes */
1.1.1.6 root 922: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
1.1 root 923: uint8_t *buf, int nb_sectors)
924: {
925: BlockDriver *drv = bs->drv;
926:
1.1.1.5 root 927: if (!drv)
928: return -ENOMEDIUM;
1.1.1.7 root 929: if (bdrv_check_request(bs, sector_num, nb_sectors))
930: return -EIO;
1.1 root 931:
1.1.1.13 root 932: return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
1.1 root 933: }
934:
1.1.1.14 root 935: static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
936: int nb_sectors, int dirty)
937: {
938: int64_t start, end;
939: unsigned long val, idx, bit;
940:
941: start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
942: end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
943:
944: for (; start <= end; start++) {
945: idx = start / (sizeof(unsigned long) * 8);
946: bit = start % (sizeof(unsigned long) * 8);
947: val = bs->dirty_bitmap[idx];
948: if (dirty) {
1.1.1.19! root 949: if (!(val & (1UL << bit))) {
1.1.1.18 root 950: bs->dirty_count++;
1.1.1.19! root 951: val |= 1UL << bit;
1.1.1.18 root 952: }
1.1.1.14 root 953: } else {
1.1.1.19! root 954: if (val & (1UL << bit)) {
1.1.1.18 root 955: bs->dirty_count--;
1.1.1.19! root 956: val &= ~(1UL << bit);
1.1.1.18 root 957: }
1.1.1.14 root 958: }
959: bs->dirty_bitmap[idx] = val;
960: }
961: }
962:
1.1.1.6 root 963: /* Return < 0 if error. Important errors are:
1.1.1.5 root 964: -EIO generic I/O error (may happen for all errors)
965: -ENOMEDIUM No media inserted.
966: -EINVAL Invalid sector number or nb_sectors
967: -EACCES Trying to write a read-only device
968: */
1.1.1.6 root 969: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
1.1 root 970: const uint8_t *buf, int nb_sectors)
971: {
1.1.1.5 root 972: BlockDriver *drv = bs->drv;
973: if (!bs->drv)
974: return -ENOMEDIUM;
1.1 root 975: if (bs->read_only)
1.1.1.5 root 976: return -EACCES;
1.1.1.7 root 977: if (bdrv_check_request(bs, sector_num, nb_sectors))
978: return -EIO;
979:
1.1.1.14 root 980: if (bs->dirty_bitmap) {
981: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
982: }
983:
1.1.1.18 root 984: if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
985: bs->wr_highest_sector = sector_num + nb_sectors - 1;
986: }
987:
1.1.1.7 root 988: return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
1.1 root 989: }
990:
1.1.1.13 root 991: int bdrv_pread(BlockDriverState *bs, int64_t offset,
992: void *buf, int count1)
1.1.1.5 root 993: {
1.1.1.14 root 994: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 995: int len, nb_sectors, count;
996: int64_t sector_num;
1.1.1.15 root 997: int ret;
1.1.1.5 root 998:
999: count = count1;
1000: /* first read to align to sector start */
1.1.1.14 root 1001: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 1002: if (len > count)
1003: len = count;
1.1.1.14 root 1004: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 1005: if (len > 0) {
1.1.1.15 root 1006: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1007: return ret;
1.1.1.14 root 1008: memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1.1.1.5 root 1009: count -= len;
1010: if (count == 0)
1011: return count1;
1012: sector_num++;
1013: buf += len;
1014: }
1015:
1016: /* read the sectors "in place" */
1.1.1.14 root 1017: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 1018: if (nb_sectors > 0) {
1.1.1.15 root 1019: if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
1020: return ret;
1.1.1.5 root 1021: sector_num += nb_sectors;
1.1.1.14 root 1022: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 1023: buf += len;
1024: count -= len;
1025: }
1026:
1027: /* add data from the last sector */
1028: if (count > 0) {
1.1.1.15 root 1029: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1030: return ret;
1.1.1.5 root 1031: memcpy(buf, tmp_buf, count);
1032: }
1033: return count1;
1034: }
1035:
1.1.1.13 root 1036: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
1037: const void *buf, int count1)
1.1.1.5 root 1038: {
1.1.1.14 root 1039: uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5 root 1040: int len, nb_sectors, count;
1041: int64_t sector_num;
1.1.1.15 root 1042: int ret;
1.1.1.5 root 1043:
1044: count = count1;
1045: /* first write to align to sector start */
1.1.1.14 root 1046: len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5 root 1047: if (len > count)
1048: len = count;
1.1.1.14 root 1049: sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5 root 1050: if (len > 0) {
1.1.1.15 root 1051: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1052: return ret;
1.1.1.14 root 1053: memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1.1.1.15 root 1054: if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1055: return ret;
1.1.1.5 root 1056: count -= len;
1057: if (count == 0)
1058: return count1;
1059: sector_num++;
1060: buf += len;
1061: }
1062:
1063: /* write the sectors "in place" */
1.1.1.14 root 1064: nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5 root 1065: if (nb_sectors > 0) {
1.1.1.15 root 1066: if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
1067: return ret;
1.1.1.5 root 1068: sector_num += nb_sectors;
1.1.1.14 root 1069: len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5 root 1070: buf += len;
1071: count -= len;
1072: }
1073:
1074: /* add data from the last sector */
1075: if (count > 0) {
1.1.1.15 root 1076: if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1077: return ret;
1.1.1.5 root 1078: memcpy(tmp_buf, buf, count);
1.1.1.15 root 1079: if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1080: return ret;
1.1.1.5 root 1081: }
1082: return count1;
1083: }
1084:
1.1.1.17 root 1085: /*
1086: * Writes to the file and ensures that no writes are reordered across this
1087: * request (acts as a barrier)
1088: *
1089: * Returns 0 on success, -errno in error cases.
1090: */
1091: int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
1092: const void *buf, int count)
1093: {
1094: int ret;
1095:
1096: ret = bdrv_pwrite(bs, offset, buf, count);
1097: if (ret < 0) {
1098: return ret;
1099: }
1100:
1101: /* No flush needed for cache=writethrough, it uses O_DSYNC */
1102: if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
1103: bdrv_flush(bs);
1104: }
1105:
1106: return 0;
1107: }
1108:
1109: /*
1110: * Writes to the file and ensures that no writes are reordered across this
1111: * request (acts as a barrier)
1112: *
1113: * Returns 0 on success, -errno in error cases.
1114: */
1115: int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
1116: const uint8_t *buf, int nb_sectors)
1117: {
1118: return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
1119: buf, BDRV_SECTOR_SIZE * nb_sectors);
1120: }
1121:
1.1.1.5 root 1122: /**
1123: * Truncate file to 'offset' bytes (needed only for file protocols)
1124: */
1125: int bdrv_truncate(BlockDriverState *bs, int64_t offset)
1126: {
1127: BlockDriver *drv = bs->drv;
1.1.1.18 root 1128: int ret;
1.1.1.5 root 1129: if (!drv)
1130: return -ENOMEDIUM;
1131: if (!drv->bdrv_truncate)
1132: return -ENOTSUP;
1.1.1.14 root 1133: if (bs->read_only)
1134: return -EACCES;
1.1.1.19! root 1135: if (bdrv_in_use(bs))
! 1136: return -EBUSY;
1.1.1.18 root 1137: ret = drv->bdrv_truncate(bs, offset);
1138: if (ret == 0) {
1139: ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1.1.1.19! root 1140: if (bs->change_cb) {
! 1141: bs->change_cb(bs->change_opaque, CHANGE_SIZE);
! 1142: }
1.1.1.18 root 1143: }
1144: return ret;
1.1.1.5 root 1145: }
1146:
1147: /**
1148: * Length of a file in bytes. Return < 0 if error or unknown.
1149: */
1150: int64_t bdrv_getlength(BlockDriverState *bs)
1151: {
1152: BlockDriver *drv = bs->drv;
1153: if (!drv)
1154: return -ENOMEDIUM;
1.1.1.18 root 1155:
1156: /* Fixed size devices use the total_sectors value for speed instead of
1157: issuing a length query (like lseek) on each call. Also, legacy block
1158: drivers don't provide a bdrv_getlength function and must use
1159: total_sectors. */
1160: if (!bs->growable || !drv->bdrv_getlength) {
1.1.1.14 root 1161: return bs->total_sectors * BDRV_SECTOR_SIZE;
1.1.1.5 root 1162: }
1163: return drv->bdrv_getlength(bs);
1164: }
1165:
1166: /* return 0 as number of sectors if no device present or error */
1.1.1.6 root 1167: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1.1 root 1168: {
1.1.1.5 root 1169: int64_t length;
1170: length = bdrv_getlength(bs);
1171: if (length < 0)
1172: length = 0;
1173: else
1.1.1.14 root 1174: length = length >> BDRV_SECTOR_BITS;
1.1.1.5 root 1175: *nb_sectors_ptr = length;
1.1 root 1176: }
1177:
1.1.1.7 root 1178: struct partition {
1179: uint8_t boot_ind; /* 0x80 - active */
1180: uint8_t head; /* starting head */
1181: uint8_t sector; /* starting sector */
1182: uint8_t cyl; /* starting cylinder */
1183: uint8_t sys_ind; /* What partition type */
1184: uint8_t end_head; /* end head */
1185: uint8_t end_sector; /* end sector */
1186: uint8_t end_cyl; /* end cylinder */
1187: uint32_t start_sect; /* starting sector counting from 0 */
1188: uint32_t nr_sects; /* nr of sectors in partition */
1189: } __attribute__((packed));
1190:
1191: /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1192: static int guess_disk_lchs(BlockDriverState *bs,
1193: int *pcylinders, int *pheads, int *psectors)
1194: {
1.1.1.18 root 1195: uint8_t buf[BDRV_SECTOR_SIZE];
1.1.1.7 root 1196: int ret, i, heads, sectors, cylinders;
1197: struct partition *p;
1198: uint32_t nr_sects;
1199: uint64_t nb_sectors;
1200:
1201: bdrv_get_geometry(bs, &nb_sectors);
1202:
1203: ret = bdrv_read(bs, 0, buf, 1);
1204: if (ret < 0)
1205: return -1;
1206: /* test msdos magic */
1207: if (buf[510] != 0x55 || buf[511] != 0xaa)
1208: return -1;
1209: for(i = 0; i < 4; i++) {
1210: p = ((struct partition *)(buf + 0x1be)) + i;
1211: nr_sects = le32_to_cpu(p->nr_sects);
1212: if (nr_sects && p->end_head) {
1213: /* We make the assumption that the partition terminates on
1214: a cylinder boundary */
1215: heads = p->end_head + 1;
1216: sectors = p->end_sector & 63;
1217: if (sectors == 0)
1218: continue;
1219: cylinders = nb_sectors / (heads * sectors);
1220: if (cylinders < 1 || cylinders > 16383)
1221: continue;
1222: *pheads = heads;
1223: *psectors = sectors;
1224: *pcylinders = cylinders;
1225: #if 0
1226: printf("guessed geometry: LCHS=%d %d %d\n",
1227: cylinders, heads, sectors);
1228: #endif
1229: return 0;
1230: }
1231: }
1232: return -1;
1233: }
1234:
1235: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1.1 root 1236: {
1.1.1.7 root 1237: int translation, lba_detected = 0;
1238: int cylinders, heads, secs;
1239: uint64_t nb_sectors;
1240:
1241: /* if a geometry hint is available, use it */
1242: bdrv_get_geometry(bs, &nb_sectors);
1243: bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1244: translation = bdrv_get_translation_hint(bs);
1245: if (cylinders != 0) {
1246: *pcyls = cylinders;
1247: *pheads = heads;
1248: *psecs = secs;
1249: } else {
1250: if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1251: if (heads > 16) {
1252: /* if heads > 16, it means that a BIOS LBA
1253: translation was active, so the default
1254: hardware geometry is OK */
1255: lba_detected = 1;
1256: goto default_geometry;
1257: } else {
1258: *pcyls = cylinders;
1259: *pheads = heads;
1260: *psecs = secs;
1261: /* disable any translation to be in sync with
1262: the logical geometry */
1263: if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1264: bdrv_set_translation_hint(bs,
1265: BIOS_ATA_TRANSLATION_NONE);
1266: }
1267: }
1268: } else {
1269: default_geometry:
1270: /* if no geometry, use a standard physical disk geometry */
1271: cylinders = nb_sectors / (16 * 63);
1272:
1273: if (cylinders > 16383)
1274: cylinders = 16383;
1275: else if (cylinders < 2)
1276: cylinders = 2;
1277: *pcyls = cylinders;
1278: *pheads = 16;
1279: *psecs = 63;
1280: if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1281: if ((*pcyls * *pheads) <= 131072) {
1282: bdrv_set_translation_hint(bs,
1283: BIOS_ATA_TRANSLATION_LARGE);
1284: } else {
1285: bdrv_set_translation_hint(bs,
1286: BIOS_ATA_TRANSLATION_LBA);
1287: }
1288: }
1289: }
1290: bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1291: }
1.1 root 1292: }
1293:
1.1.1.6 root 1294: void bdrv_set_geometry_hint(BlockDriverState *bs,
1.1 root 1295: int cyls, int heads, int secs)
1296: {
1297: bs->cyls = cyls;
1298: bs->heads = heads;
1299: bs->secs = secs;
1300: }
1301:
1302: void bdrv_set_type_hint(BlockDriverState *bs, int type)
1303: {
1304: bs->type = type;
1305: bs->removable = ((type == BDRV_TYPE_CDROM ||
1306: type == BDRV_TYPE_FLOPPY));
1307: }
1308:
1309: void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1310: {
1311: bs->translation = translation;
1312: }
1313:
1.1.1.6 root 1314: void bdrv_get_geometry_hint(BlockDriverState *bs,
1.1 root 1315: int *pcyls, int *pheads, int *psecs)
1316: {
1317: *pcyls = bs->cyls;
1318: *pheads = bs->heads;
1319: *psecs = bs->secs;
1320: }
1321:
1322: int bdrv_get_type_hint(BlockDriverState *bs)
1323: {
1324: return bs->type;
1325: }
1326:
1327: int bdrv_get_translation_hint(BlockDriverState *bs)
1328: {
1329: return bs->translation;
1330: }
1331:
1.1.1.18 root 1332: void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
1333: BlockErrorAction on_write_error)
1334: {
1335: bs->on_read_error = on_read_error;
1336: bs->on_write_error = on_write_error;
1337: }
1338:
1339: BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
1340: {
1341: return is_read ? bs->on_read_error : bs->on_write_error;
1342: }
1343:
1344: void bdrv_set_removable(BlockDriverState *bs, int removable)
1345: {
1346: bs->removable = removable;
1347: if (removable && bs == bs_snapshots) {
1348: bs_snapshots = NULL;
1349: }
1350: }
1351:
1.1 root 1352: int bdrv_is_removable(BlockDriverState *bs)
1353: {
1354: return bs->removable;
1355: }
1356:
1357: int bdrv_is_read_only(BlockDriverState *bs)
1358: {
1359: return bs->read_only;
1360: }
1361:
1.1.1.6 root 1362: int bdrv_is_sg(BlockDriverState *bs)
1363: {
1364: return bs->sg;
1365: }
1366:
1.1.1.14 root 1367: int bdrv_enable_write_cache(BlockDriverState *bs)
1368: {
1369: return bs->enable_write_cache;
1370: }
1371:
1.1.1.5 root 1372: /* XXX: no longer used */
1.1.1.6 root 1373: void bdrv_set_change_cb(BlockDriverState *bs,
1.1.1.19! root 1374: void (*change_cb)(void *opaque, int reason),
! 1375: void *opaque)
1.1 root 1376: {
1377: bs->change_cb = change_cb;
1378: bs->change_opaque = opaque;
1379: }
1380:
1381: int bdrv_is_encrypted(BlockDriverState *bs)
1382: {
1383: if (bs->backing_hd && bs->backing_hd->encrypted)
1384: return 1;
1385: return bs->encrypted;
1386: }
1387:
1.1.1.8 root 1388: int bdrv_key_required(BlockDriverState *bs)
1389: {
1390: BlockDriverState *backing_hd = bs->backing_hd;
1391:
1392: if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1393: return 1;
1394: return (bs->encrypted && !bs->valid_key);
1395: }
1396:
1.1 root 1397: int bdrv_set_key(BlockDriverState *bs, const char *key)
1398: {
1399: int ret;
1400: if (bs->backing_hd && bs->backing_hd->encrypted) {
1401: ret = bdrv_set_key(bs->backing_hd, key);
1402: if (ret < 0)
1403: return ret;
1404: if (!bs->encrypted)
1405: return 0;
1406: }
1.1.1.18 root 1407: if (!bs->encrypted) {
1408: return -EINVAL;
1409: } else if (!bs->drv || !bs->drv->bdrv_set_key) {
1410: return -ENOMEDIUM;
1411: }
1.1.1.8 root 1412: ret = bs->drv->bdrv_set_key(bs, key);
1.1.1.13 root 1413: if (ret < 0) {
1414: bs->valid_key = 0;
1415: } else if (!bs->valid_key) {
1416: bs->valid_key = 1;
1417: /* call the change callback now, we skipped it on open */
1418: bs->media_changed = 1;
1419: if (bs->change_cb)
1.1.1.19! root 1420: bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1.1.13 root 1421: }
1.1.1.8 root 1422: return ret;
1.1 root 1423: }
1424:
1425: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1426: {
1.1.1.5 root 1427: if (!bs->drv) {
1.1 root 1428: buf[0] = '\0';
1429: } else {
1430: pstrcpy(buf, buf_size, bs->drv->format_name);
1431: }
1432: }
1433:
1.1.1.6 root 1434: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1.1 root 1435: void *opaque)
1436: {
1437: BlockDriver *drv;
1438:
1.1.1.18 root 1439: QLIST_FOREACH(drv, &bdrv_drivers, list) {
1.1 root 1440: it(opaque, drv->format_name);
1441: }
1442: }
1443:
1444: BlockDriverState *bdrv_find(const char *name)
1445: {
1446: BlockDriverState *bs;
1447:
1.1.1.18 root 1448: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1449: if (!strcmp(name, bs->device_name)) {
1.1 root 1450: return bs;
1.1.1.18 root 1451: }
1.1 root 1452: }
1453: return NULL;
1454: }
1455:
1.1.1.18 root 1456: BlockDriverState *bdrv_next(BlockDriverState *bs)
1457: {
1458: if (!bs) {
1459: return QTAILQ_FIRST(&bdrv_states);
1460: }
1461: return QTAILQ_NEXT(bs, list);
1462: }
1463:
1.1.1.8 root 1464: void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1.1 root 1465: {
1466: BlockDriverState *bs;
1467:
1.1.1.18 root 1468: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.8 root 1469: it(opaque, bs);
1.1 root 1470: }
1471: }
1472:
1473: const char *bdrv_get_device_name(BlockDriverState *bs)
1474: {
1475: return bs->device_name;
1476: }
1477:
1.1.1.19! root 1478: int bdrv_flush(BlockDriverState *bs)
1.1.1.4 root 1479: {
1.1.1.18 root 1480: if (bs->open_flags & BDRV_O_NO_FLUSH) {
1.1.1.19! root 1481: return 0;
! 1482: }
! 1483:
! 1484: if (bs->drv && bs->drv->bdrv_flush) {
! 1485: return bs->drv->bdrv_flush(bs);
1.1.1.18 root 1486: }
1487:
1.1.1.19! root 1488: /*
! 1489: * Some block drivers always operate in either writethrough or unsafe mode
! 1490: * and don't support bdrv_flush therefore. Usually qemu doesn't know how
! 1491: * the server works (because the behaviour is hardcoded or depends on
! 1492: * server-side configuration), so we can't ensure that everything is safe
! 1493: * on disk. Returning an error doesn't work because that would break guests
! 1494: * even if the server operates in writethrough mode.
! 1495: *
! 1496: * Let's hope the user knows what he's doing.
! 1497: */
! 1498: return 0;
1.1.1.4 root 1499: }
1500:
1.1.1.7 root 1501: void bdrv_flush_all(void)
1502: {
1503: BlockDriverState *bs;
1504:
1.1.1.18 root 1505: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1506: if (bs->drv && !bdrv_is_read_only(bs) &&
1507: (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1.1.1.7 root 1508: bdrv_flush(bs);
1.1.1.18 root 1509: }
1510: }
1511: }
1512:
1513: int bdrv_has_zero_init(BlockDriverState *bs)
1514: {
1515: assert(bs->drv);
1516:
1517: if (bs->drv->bdrv_has_zero_init) {
1518: return bs->drv->bdrv_has_zero_init(bs);
1519: }
1520:
1521: return 1;
1.1.1.7 root 1522: }
1523:
1.1.1.19! root 1524: int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
! 1525: {
! 1526: if (!bs->drv) {
! 1527: return -ENOMEDIUM;
! 1528: }
! 1529: if (!bs->drv->bdrv_discard) {
! 1530: return 0;
! 1531: }
! 1532: return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
! 1533: }
! 1534:
1.1.1.7 root 1535: /*
1536: * Returns true iff the specified sector is present in the disk image. Drivers
1537: * not implementing the functionality are assumed to not support backing files,
1538: * hence all their sectors are reported as allocated.
1539: *
1540: * 'pnum' is set to the number of sectors (including and immediately following
1541: * the specified sector) that are known to be in the same
1542: * allocated/unallocated state.
1543: *
1544: * 'nb_sectors' is the max value 'pnum' should be set to.
1545: */
1546: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1547: int *pnum)
1548: {
1549: int64_t n;
1550: if (!bs->drv->bdrv_is_allocated) {
1551: if (sector_num >= bs->total_sectors) {
1552: *pnum = 0;
1553: return 0;
1554: }
1555: n = bs->total_sectors - sector_num;
1556: *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1557: return 1;
1558: }
1559: return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1560: }
1561:
1.1.1.18 root 1562: void bdrv_mon_event(const BlockDriverState *bdrv,
1563: BlockMonEventAction action, int is_read)
1564: {
1565: QObject *data;
1566: const char *action_str;
1567:
1568: switch (action) {
1569: case BDRV_ACTION_REPORT:
1570: action_str = "report";
1571: break;
1572: case BDRV_ACTION_IGNORE:
1573: action_str = "ignore";
1574: break;
1575: case BDRV_ACTION_STOP:
1576: action_str = "stop";
1577: break;
1578: default:
1579: abort();
1580: }
1581:
1582: data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1583: bdrv->device_name,
1584: action_str,
1585: is_read ? "read" : "write");
1586: monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
1587:
1588: qobject_decref(data);
1589: }
1590:
1.1.1.14 root 1591: static void bdrv_print_dict(QObject *obj, void *opaque)
1.1 root 1592: {
1.1.1.14 root 1593: QDict *bs_dict;
1594: Monitor *mon = opaque;
1595:
1596: bs_dict = qobject_to_qdict(obj);
1597:
1598: monitor_printf(mon, "%s: type=%s removable=%d",
1599: qdict_get_str(bs_dict, "device"),
1600: qdict_get_str(bs_dict, "type"),
1601: qdict_get_bool(bs_dict, "removable"));
1602:
1603: if (qdict_get_bool(bs_dict, "removable")) {
1604: monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1605: }
1606:
1607: if (qdict_haskey(bs_dict, "inserted")) {
1608: QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1609:
1610: monitor_printf(mon, " file=");
1611: monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1612: if (qdict_haskey(qdict, "backing_file")) {
1613: monitor_printf(mon, " backing_file=");
1614: monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1615: }
1616: monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1617: qdict_get_bool(qdict, "ro"),
1618: qdict_get_str(qdict, "drv"),
1619: qdict_get_bool(qdict, "encrypted"));
1620: } else {
1621: monitor_printf(mon, " [not inserted]");
1622: }
1623:
1624: monitor_printf(mon, "\n");
1625: }
1626:
1627: void bdrv_info_print(Monitor *mon, const QObject *data)
1628: {
1629: qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1630: }
1631:
1632: void bdrv_info(Monitor *mon, QObject **ret_data)
1633: {
1634: QList *bs_list;
1.1 root 1635: BlockDriverState *bs;
1636:
1.1.1.14 root 1637: bs_list = qlist_new();
1638:
1.1.1.18 root 1639: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.14 root 1640: QObject *bs_obj;
1641: const char *type = "unknown";
1642:
1.1 root 1643: switch(bs->type) {
1644: case BDRV_TYPE_HD:
1.1.1.14 root 1645: type = "hd";
1.1 root 1646: break;
1647: case BDRV_TYPE_CDROM:
1.1.1.14 root 1648: type = "cdrom";
1.1 root 1649: break;
1650: case BDRV_TYPE_FLOPPY:
1.1.1.14 root 1651: type = "floppy";
1.1 root 1652: break;
1653: }
1.1.1.14 root 1654:
1655: bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1656: "'removable': %i, 'locked': %i }",
1657: bs->device_name, type, bs->removable,
1658: bs->locked);
1659:
1.1.1.5 root 1660: if (bs->drv) {
1.1.1.14 root 1661: QObject *obj;
1662: QDict *bs_dict = qobject_to_qdict(bs_obj);
1663:
1664: obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1665: "'encrypted': %i }",
1666: bs->filename, bs->read_only,
1667: bs->drv->format_name,
1668: bdrv_is_encrypted(bs));
1.1.1.5 root 1669: if (bs->backing_file[0] != '\0') {
1.1.1.14 root 1670: QDict *qdict = qobject_to_qdict(obj);
1671: qdict_put(qdict, "backing_file",
1672: qstring_from_str(bs->backing_file));
1.1.1.13 root 1673: }
1.1.1.14 root 1674:
1675: qdict_put_obj(bs_dict, "inserted", obj);
1.1 root 1676: }
1.1.1.14 root 1677: qlist_append_obj(bs_list, bs_obj);
1.1 root 1678: }
1.1.1.14 root 1679:
1680: *ret_data = QOBJECT(bs_list);
1681: }
1682:
1683: static void bdrv_stats_iter(QObject *data, void *opaque)
1684: {
1685: QDict *qdict;
1686: Monitor *mon = opaque;
1687:
1688: qdict = qobject_to_qdict(data);
1689: monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1690:
1691: qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1692: monitor_printf(mon, " rd_bytes=%" PRId64
1693: " wr_bytes=%" PRId64
1694: " rd_operations=%" PRId64
1695: " wr_operations=%" PRId64
1696: "\n",
1697: qdict_get_int(qdict, "rd_bytes"),
1698: qdict_get_int(qdict, "wr_bytes"),
1699: qdict_get_int(qdict, "rd_operations"),
1700: qdict_get_int(qdict, "wr_operations"));
1701: }
1702:
1703: void bdrv_stats_print(Monitor *mon, const QObject *data)
1704: {
1705: qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1.1 root 1706: }
1707:
1.1.1.18 root 1708: static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
1709: {
1710: QObject *res;
1711: QDict *dict;
1712:
1713: res = qobject_from_jsonf("{ 'stats': {"
1714: "'rd_bytes': %" PRId64 ","
1715: "'wr_bytes': %" PRId64 ","
1716: "'rd_operations': %" PRId64 ","
1717: "'wr_operations': %" PRId64 ","
1718: "'wr_highest_offset': %" PRId64
1719: "} }",
1720: bs->rd_bytes, bs->wr_bytes,
1721: bs->rd_ops, bs->wr_ops,
1722: bs->wr_highest_sector *
1723: (uint64_t)BDRV_SECTOR_SIZE);
1724: dict = qobject_to_qdict(res);
1725:
1726: if (*bs->device_name) {
1727: qdict_put(dict, "device", qstring_from_str(bs->device_name));
1728: }
1729:
1730: if (bs->file) {
1731: QObject *parent = bdrv_info_stats_bs(bs->file);
1732: qdict_put_obj(dict, "parent", parent);
1733: }
1734:
1735: return res;
1736: }
1737:
1.1.1.14 root 1738: void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1.1.1.6 root 1739: {
1.1.1.14 root 1740: QObject *obj;
1741: QList *devices;
1.1.1.6 root 1742: BlockDriverState *bs;
1743:
1.1.1.14 root 1744: devices = qlist_new();
1745:
1.1.1.18 root 1746: QTAILQ_FOREACH(bs, &bdrv_states, list) {
1747: obj = bdrv_info_stats_bs(bs);
1.1.1.14 root 1748: qlist_append_obj(devices, obj);
1.1.1.6 root 1749: }
1.1.1.14 root 1750:
1751: *ret_data = QOBJECT(devices);
1.1.1.6 root 1752: }
1753:
1.1.1.8 root 1754: const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1755: {
1756: if (bs->backing_hd && bs->backing_hd->encrypted)
1757: return bs->backing_file;
1758: else if (bs->encrypted)
1759: return bs->filename;
1760: else
1761: return NULL;
1762: }
1763:
1.1.1.6 root 1764: void bdrv_get_backing_filename(BlockDriverState *bs,
1.1.1.5 root 1765: char *filename, int filename_size)
1766: {
1.1.1.18 root 1767: if (!bs->backing_file) {
1.1.1.5 root 1768: pstrcpy(filename, filename_size, "");
1769: } else {
1770: pstrcpy(filename, filename_size, bs->backing_file);
1771: }
1772: }
1773:
1.1.1.6 root 1774: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 1775: const uint8_t *buf, int nb_sectors)
1776: {
1777: BlockDriver *drv = bs->drv;
1778: if (!drv)
1779: return -ENOMEDIUM;
1780: if (!drv->bdrv_write_compressed)
1781: return -ENOTSUP;
1.1.1.11 root 1782: if (bdrv_check_request(bs, sector_num, nb_sectors))
1783: return -EIO;
1.1.1.14 root 1784:
1785: if (bs->dirty_bitmap) {
1786: set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1787: }
1788:
1.1.1.5 root 1789: return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1790: }
1.1.1.6 root 1791:
1.1.1.5 root 1792: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1793: {
1794: BlockDriver *drv = bs->drv;
1795: if (!drv)
1796: return -ENOMEDIUM;
1797: if (!drv->bdrv_get_info)
1798: return -ENOTSUP;
1799: memset(bdi, 0, sizeof(*bdi));
1800: return drv->bdrv_get_info(bs, bdi);
1801: }
1802:
1.1.1.13 root 1803: int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1804: int64_t pos, int size)
1.1.1.9 root 1805: {
1806: BlockDriver *drv = bs->drv;
1807: if (!drv)
1808: return -ENOMEDIUM;
1.1.1.18 root 1809: if (drv->bdrv_save_vmstate)
1810: return drv->bdrv_save_vmstate(bs, buf, pos, size);
1811: if (bs->file)
1812: return bdrv_save_vmstate(bs->file, buf, pos, size);
1813: return -ENOTSUP;
1.1.1.9 root 1814: }
1815:
1.1.1.13 root 1816: int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1817: int64_t pos, int size)
1.1.1.9 root 1818: {
1819: BlockDriver *drv = bs->drv;
1820: if (!drv)
1821: return -ENOMEDIUM;
1.1.1.18 root 1822: if (drv->bdrv_load_vmstate)
1823: return drv->bdrv_load_vmstate(bs, buf, pos, size);
1824: if (bs->file)
1825: return bdrv_load_vmstate(bs->file, buf, pos, size);
1826: return -ENOTSUP;
1827: }
1828:
1829: void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
1830: {
1831: BlockDriver *drv = bs->drv;
1832:
1833: if (!drv || !drv->bdrv_debug_event) {
1834: return;
1835: }
1836:
1837: return drv->bdrv_debug_event(bs, event);
1838:
1.1.1.9 root 1839: }
1840:
1.1 root 1841: /**************************************************************/
1.1.1.5 root 1842: /* handling of snapshots */
1.1 root 1843:
1.1.1.18 root 1844: int bdrv_can_snapshot(BlockDriverState *bs)
1845: {
1846: BlockDriver *drv = bs->drv;
1847: if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1848: return 0;
1849: }
1850:
1851: if (!drv->bdrv_snapshot_create) {
1852: if (bs->file != NULL) {
1853: return bdrv_can_snapshot(bs->file);
1854: }
1855: return 0;
1856: }
1857:
1858: return 1;
1859: }
1860:
1861: int bdrv_is_snapshot(BlockDriverState *bs)
1862: {
1863: return !!(bs->open_flags & BDRV_O_SNAPSHOT);
1864: }
1865:
1866: BlockDriverState *bdrv_snapshots(void)
1867: {
1868: BlockDriverState *bs;
1869:
1870: if (bs_snapshots) {
1871: return bs_snapshots;
1872: }
1873:
1874: bs = NULL;
1875: while ((bs = bdrv_next(bs))) {
1876: if (bdrv_can_snapshot(bs)) {
1877: bs_snapshots = bs;
1878: return bs;
1879: }
1880: }
1881: return NULL;
1882: }
1883:
1.1.1.6 root 1884: int bdrv_snapshot_create(BlockDriverState *bs,
1.1.1.5 root 1885: QEMUSnapshotInfo *sn_info)
1886: {
1887: BlockDriver *drv = bs->drv;
1888: if (!drv)
1889: return -ENOMEDIUM;
1.1.1.18 root 1890: if (drv->bdrv_snapshot_create)
1891: return drv->bdrv_snapshot_create(bs, sn_info);
1892: if (bs->file)
1893: return bdrv_snapshot_create(bs->file, sn_info);
1894: return -ENOTSUP;
1.1.1.5 root 1895: }
1.1 root 1896:
1.1.1.6 root 1897: int bdrv_snapshot_goto(BlockDriverState *bs,
1.1.1.5 root 1898: const char *snapshot_id)
1.1 root 1899: {
1.1.1.5 root 1900: BlockDriver *drv = bs->drv;
1.1.1.18 root 1901: int ret, open_ret;
1902:
1.1.1.5 root 1903: if (!drv)
1904: return -ENOMEDIUM;
1.1.1.18 root 1905: if (drv->bdrv_snapshot_goto)
1906: return drv->bdrv_snapshot_goto(bs, snapshot_id);
1907:
1908: if (bs->file) {
1909: drv->bdrv_close(bs);
1910: ret = bdrv_snapshot_goto(bs->file, snapshot_id);
1911: open_ret = drv->bdrv_open(bs, bs->open_flags);
1912: if (open_ret < 0) {
1913: bdrv_delete(bs->file);
1914: bs->drv = NULL;
1915: return open_ret;
1916: }
1917: return ret;
1918: }
1919:
1920: return -ENOTSUP;
1.1 root 1921: }
1922:
1.1.1.5 root 1923: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1.1 root 1924: {
1.1.1.5 root 1925: BlockDriver *drv = bs->drv;
1926: if (!drv)
1927: return -ENOMEDIUM;
1.1.1.18 root 1928: if (drv->bdrv_snapshot_delete)
1929: return drv->bdrv_snapshot_delete(bs, snapshot_id);
1930: if (bs->file)
1931: return bdrv_snapshot_delete(bs->file, snapshot_id);
1932: return -ENOTSUP;
1.1.1.5 root 1933: }
1.1 root 1934:
1.1.1.6 root 1935: int bdrv_snapshot_list(BlockDriverState *bs,
1.1.1.5 root 1936: QEMUSnapshotInfo **psn_info)
1937: {
1938: BlockDriver *drv = bs->drv;
1939: if (!drv)
1940: return -ENOMEDIUM;
1.1.1.18 root 1941: if (drv->bdrv_snapshot_list)
1942: return drv->bdrv_snapshot_list(bs, psn_info);
1943: if (bs->file)
1944: return bdrv_snapshot_list(bs->file, psn_info);
1945: return -ENOTSUP;
1.1.1.5 root 1946: }
1947:
1.1.1.19! root 1948: int bdrv_snapshot_load_tmp(BlockDriverState *bs,
! 1949: const char *snapshot_name)
! 1950: {
! 1951: BlockDriver *drv = bs->drv;
! 1952: if (!drv) {
! 1953: return -ENOMEDIUM;
! 1954: }
! 1955: if (!bs->read_only) {
! 1956: return -EINVAL;
! 1957: }
! 1958: if (drv->bdrv_snapshot_load_tmp) {
! 1959: return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
! 1960: }
! 1961: return -ENOTSUP;
! 1962: }
! 1963:
1.1.1.5 root 1964: #define NB_SUFFIXES 4
1965:
1966: char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1967: {
1968: static const char suffixes[NB_SUFFIXES] = "KMGT";
1969: int64_t base;
1970: int i;
1971:
1972: if (size <= 999) {
1973: snprintf(buf, buf_size, "%" PRId64, size);
1974: } else {
1975: base = 1024;
1976: for(i = 0; i < NB_SUFFIXES; i++) {
1977: if (size < (10 * base)) {
1.1.1.6 root 1978: snprintf(buf, buf_size, "%0.1f%c",
1.1.1.5 root 1979: (double)size / base,
1980: suffixes[i]);
1981: break;
1982: } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1.1.1.6 root 1983: snprintf(buf, buf_size, "%" PRId64 "%c",
1.1.1.5 root 1984: ((size + (base >> 1)) / base),
1985: suffixes[i]);
1986: break;
1987: }
1988: base = base * 1024;
1989: }
1.1 root 1990: }
1.1.1.5 root 1991: return buf;
1992: }
1993:
1994: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1995: {
1996: char buf1[128], date_buf[128], clock_buf[128];
1997: #ifdef _WIN32
1998: struct tm *ptm;
1.1.1.2 root 1999: #else
1.1.1.5 root 2000: struct tm tm;
1.1.1.2 root 2001: #endif
1.1.1.5 root 2002: time_t ti;
2003: int64_t secs;
2004:
2005: if (!sn) {
1.1.1.6 root 2006: snprintf(buf, buf_size,
2007: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 2008: "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2009: } else {
2010: ti = sn->date_sec;
1.1 root 2011: #ifdef _WIN32
1.1.1.5 root 2012: ptm = localtime(&ti);
2013: strftime(date_buf, sizeof(date_buf),
2014: "%Y-%m-%d %H:%M:%S", ptm);
2015: #else
2016: localtime_r(&ti, &tm);
2017: strftime(date_buf, sizeof(date_buf),
2018: "%Y-%m-%d %H:%M:%S", &tm);
1.1 root 2019: #endif
1.1.1.5 root 2020: secs = sn->vm_clock_nsec / 1000000000;
2021: snprintf(clock_buf, sizeof(clock_buf),
2022: "%02d:%02d:%02d.%03d",
2023: (int)(secs / 3600),
2024: (int)((secs / 60) % 60),
1.1.1.6 root 2025: (int)(secs % 60),
1.1.1.5 root 2026: (int)((sn->vm_clock_nsec / 1000000) % 1000));
2027: snprintf(buf, buf_size,
1.1.1.6 root 2028: "%-10s%-20s%7s%20s%15s",
1.1.1.5 root 2029: sn->id_str, sn->name,
2030: get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
2031: date_buf,
2032: clock_buf);
2033: }
2034: return buf;
1.1 root 2035: }
2036:
2037:
1.1.1.5 root 2038: /**************************************************************/
2039: /* async I/Os */
2040:
1.1.1.7 root 2041: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1.1.1.13 root 2042: QEMUIOVector *qiov, int nb_sectors,
1.1.1.7 root 2043: BlockDriverCompletionFunc *cb, void *opaque)
2044: {
1.1.1.5 root 2045: BlockDriver *drv = bs->drv;
1.1.1.6 root 2046: BlockDriverAIOCB *ret;
1.1.1.5 root 2047:
1.1.1.19! root 2048: trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
! 2049:
1.1.1.5 root 2050: if (!drv)
2051: return NULL;
1.1.1.7 root 2052: if (bdrv_check_request(bs, sector_num, nb_sectors))
2053: return NULL;
1.1.1.5 root 2054:
1.1.1.13 root 2055: ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
2056: cb, opaque);
1.1.1.6 root 2057:
2058: if (ret) {
2059: /* Update stats even though technically transfer has not happened. */
1.1.1.14 root 2060: bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6 root 2061: bs->rd_ops ++;
2062: }
2063:
2064: return ret;
1.1 root 2065: }
2066:
1.1.1.19! root 2067: typedef struct BlockCompleteData {
! 2068: BlockDriverCompletionFunc *cb;
! 2069: void *opaque;
! 2070: BlockDriverState *bs;
! 2071: int64_t sector_num;
! 2072: int nb_sectors;
! 2073: } BlockCompleteData;
! 2074:
! 2075: static void block_complete_cb(void *opaque, int ret)
! 2076: {
! 2077: BlockCompleteData *b = opaque;
! 2078:
! 2079: if (b->bs->dirty_bitmap) {
! 2080: set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
! 2081: }
! 2082: b->cb(b->opaque, ret);
! 2083: qemu_free(b);
! 2084: }
! 2085:
! 2086: static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
! 2087: int64_t sector_num,
! 2088: int nb_sectors,
! 2089: BlockDriverCompletionFunc *cb,
! 2090: void *opaque)
! 2091: {
! 2092: BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
! 2093:
! 2094: blkdata->bs = bs;
! 2095: blkdata->cb = cb;
! 2096: blkdata->opaque = opaque;
! 2097: blkdata->sector_num = sector_num;
! 2098: blkdata->nb_sectors = nb_sectors;
! 2099:
! 2100: return blkdata;
! 2101: }
! 2102:
1.1.1.13 root 2103: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
2104: QEMUIOVector *qiov, int nb_sectors,
2105: BlockDriverCompletionFunc *cb, void *opaque)
1.1 root 2106: {
1.1.1.5 root 2107: BlockDriver *drv = bs->drv;
1.1.1.6 root 2108: BlockDriverAIOCB *ret;
1.1.1.19! root 2109: BlockCompleteData *blk_cb_data;
! 2110:
! 2111: trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
1.1 root 2112:
1.1.1.5 root 2113: if (!drv)
2114: return NULL;
2115: if (bs->read_only)
2116: return NULL;
1.1.1.7 root 2117: if (bdrv_check_request(bs, sector_num, nb_sectors))
2118: return NULL;
1.1.1.4 root 2119:
1.1.1.14 root 2120: if (bs->dirty_bitmap) {
1.1.1.19! root 2121: blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
! 2122: opaque);
! 2123: cb = &block_complete_cb;
! 2124: opaque = blk_cb_data;
1.1.1.14 root 2125: }
2126:
1.1.1.13 root 2127: ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
2128: cb, opaque);
1.1.1.6 root 2129:
2130: if (ret) {
1.1.1.18 root 2131: /* Update stats even though technically transfer has not happened. */
2132: bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
2133: bs->wr_ops ++;
2134: if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
2135: bs->wr_highest_sector = sector_num + nb_sectors - 1;
2136: }
1.1.1.6 root 2137: }
2138:
2139: return ret;
1.1.1.5 root 2140: }
2141:
1.1.1.14 root 2142:
2143: typedef struct MultiwriteCB {
2144: int error;
2145: int num_requests;
2146: int num_callbacks;
2147: struct {
2148: BlockDriverCompletionFunc *cb;
2149: void *opaque;
2150: QEMUIOVector *free_qiov;
2151: void *free_buf;
2152: } callbacks[];
2153: } MultiwriteCB;
2154:
2155: static void multiwrite_user_cb(MultiwriteCB *mcb)
2156: {
2157: int i;
2158:
2159: for (i = 0; i < mcb->num_callbacks; i++) {
2160: mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1.1.1.16 root 2161: if (mcb->callbacks[i].free_qiov) {
2162: qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
2163: }
1.1.1.14 root 2164: qemu_free(mcb->callbacks[i].free_qiov);
1.1.1.15 root 2165: qemu_vfree(mcb->callbacks[i].free_buf);
1.1.1.14 root 2166: }
2167: }
2168:
2169: static void multiwrite_cb(void *opaque, int ret)
2170: {
2171: MultiwriteCB *mcb = opaque;
2172:
1.1.1.19! root 2173: trace_multiwrite_cb(mcb, ret);
! 2174:
1.1.1.16 root 2175: if (ret < 0 && !mcb->error) {
1.1.1.14 root 2176: mcb->error = ret;
2177: }
2178:
2179: mcb->num_requests--;
2180: if (mcb->num_requests == 0) {
1.1.1.17 root 2181: multiwrite_user_cb(mcb);
1.1.1.14 root 2182: qemu_free(mcb);
2183: }
2184: }
2185:
2186: static int multiwrite_req_compare(const void *a, const void *b)
2187: {
1.1.1.17 root 2188: const BlockRequest *req1 = a, *req2 = b;
2189:
2190: /*
2191: * Note that we can't simply subtract req2->sector from req1->sector
2192: * here as that could overflow the return value.
2193: */
2194: if (req1->sector > req2->sector) {
2195: return 1;
2196: } else if (req1->sector < req2->sector) {
2197: return -1;
2198: } else {
2199: return 0;
2200: }
1.1.1.14 root 2201: }
2202:
2203: /*
2204: * Takes a bunch of requests and tries to merge them. Returns the number of
2205: * requests that remain after merging.
2206: */
2207: static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
2208: int num_reqs, MultiwriteCB *mcb)
2209: {
2210: int i, outidx;
2211:
2212: // Sort requests by start sector
2213: qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
2214:
2215: // Check if adjacent requests touch the same clusters. If so, combine them,
2216: // filling up gaps with zero sectors.
2217: outidx = 0;
2218: for (i = 1; i < num_reqs; i++) {
2219: int merge = 0;
2220: int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
2221:
2222: // This handles the cases that are valid for all block drivers, namely
2223: // exactly sequential writes and overlapping writes.
2224: if (reqs[i].sector <= oldreq_last) {
2225: merge = 1;
2226: }
2227:
2228: // The block driver may decide that it makes sense to combine requests
2229: // even if there is a gap of some sectors between them. In this case,
2230: // the gap is filled with zeros (therefore only applicable for yet
2231: // unused space in format like qcow2).
2232: if (!merge && bs->drv->bdrv_merge_requests) {
2233: merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
2234: }
2235:
1.1.1.16 root 2236: if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
2237: merge = 0;
2238: }
2239:
1.1.1.14 root 2240: if (merge) {
2241: size_t size;
2242: QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
2243: qemu_iovec_init(qiov,
2244: reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
2245:
2246: // Add the first request to the merged one. If the requests are
2247: // overlapping, drop the last sectors of the first request.
2248: size = (reqs[i].sector - reqs[outidx].sector) << 9;
2249: qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
2250:
2251: // We might need to add some zeros between the two requests
2252: if (reqs[i].sector > oldreq_last) {
2253: size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
2254: uint8_t *buf = qemu_blockalign(bs, zero_bytes);
2255: memset(buf, 0, zero_bytes);
2256: qemu_iovec_add(qiov, buf, zero_bytes);
2257: mcb->callbacks[i].free_buf = buf;
2258: }
2259:
2260: // Add the second request
2261: qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
2262:
1.1.1.17 root 2263: reqs[outidx].nb_sectors = qiov->size >> 9;
1.1.1.14 root 2264: reqs[outidx].qiov = qiov;
2265:
2266: mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
2267: } else {
2268: outidx++;
2269: reqs[outidx].sector = reqs[i].sector;
2270: reqs[outidx].nb_sectors = reqs[i].nb_sectors;
2271: reqs[outidx].qiov = reqs[i].qiov;
2272: }
2273: }
2274:
2275: return outidx + 1;
2276: }
2277:
2278: /*
2279: * Submit multiple AIO write requests at once.
2280: *
2281: * On success, the function returns 0 and all requests in the reqs array have
2282: * been submitted. In error case this function returns -1, and any of the
2283: * requests may or may not be submitted yet. In particular, this means that the
2284: * callback will be called for some of the requests, for others it won't. The
2285: * caller must check the error field of the BlockRequest to wait for the right
2286: * callbacks (if error != 0, no callback will be called).
2287: *
2288: * The implementation may modify the contents of the reqs array, e.g. to merge
2289: * requests. However, the fields opaque and error are left unmodified as they
2290: * are used to signal failure for a single request to the caller.
2291: */
2292: int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
2293: {
2294: BlockDriverAIOCB *acb;
2295: MultiwriteCB *mcb;
2296: int i;
2297:
2298: if (num_reqs == 0) {
2299: return 0;
2300: }
2301:
2302: // Create MultiwriteCB structure
2303: mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
2304: mcb->num_requests = 0;
2305: mcb->num_callbacks = num_reqs;
2306:
2307: for (i = 0; i < num_reqs; i++) {
2308: mcb->callbacks[i].cb = reqs[i].cb;
2309: mcb->callbacks[i].opaque = reqs[i].opaque;
2310: }
2311:
2312: // Check for mergable requests
2313: num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2314:
1.1.1.19! root 2315: trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
! 2316:
1.1.1.17 root 2317: /*
2318: * Run the aio requests. As soon as one request can't be submitted
2319: * successfully, fail all requests that are not yet submitted (we must
2320: * return failure for all requests anyway)
2321: *
2322: * num_requests cannot be set to the right value immediately: If
2323: * bdrv_aio_writev fails for some request, num_requests would be too high
2324: * and therefore multiwrite_cb() would never recognize the multiwrite
2325: * request as completed. We also cannot use the loop variable i to set it
2326: * when the first request fails because the callback may already have been
2327: * called for previously submitted requests. Thus, num_requests must be
2328: * incremented for each request that is submitted.
2329: *
2330: * The problem that callbacks may be called early also means that we need
2331: * to take care that num_requests doesn't become 0 before all requests are
2332: * submitted - multiwrite_cb() would consider the multiwrite request
2333: * completed. A dummy request that is "completed" by a manual call to
2334: * multiwrite_cb() takes care of this.
2335: */
2336: mcb->num_requests = 1;
2337:
1.1.1.19! root 2338: // Run the aio requests
1.1.1.14 root 2339: for (i = 0; i < num_reqs; i++) {
1.1.1.17 root 2340: mcb->num_requests++;
1.1.1.14 root 2341: acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2342: reqs[i].nb_sectors, multiwrite_cb, mcb);
2343:
2344: if (acb == NULL) {
2345: // We can only fail the whole thing if no request has been
2346: // submitted yet. Otherwise we'll wait for the submitted AIOs to
2347: // complete and report the error in the callback.
1.1.1.17 root 2348: if (i == 0) {
1.1.1.19! root 2349: trace_bdrv_aio_multiwrite_earlyfail(mcb);
1.1.1.14 root 2350: goto fail;
2351: } else {
1.1.1.19! root 2352: trace_bdrv_aio_multiwrite_latefail(mcb, i);
1.1.1.16 root 2353: multiwrite_cb(mcb, -EIO);
1.1.1.14 root 2354: break;
2355: }
2356: }
2357: }
2358:
1.1.1.17 root 2359: /* Complete the dummy request */
2360: multiwrite_cb(mcb, 0);
2361:
1.1.1.14 root 2362: return 0;
2363:
2364: fail:
1.1.1.17 root 2365: for (i = 0; i < mcb->num_callbacks; i++) {
2366: reqs[i].error = -EIO;
2367: }
2368: qemu_free(mcb);
1.1.1.14 root 2369: return -1;
2370: }
2371:
2372: BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2373: BlockDriverCompletionFunc *cb, void *opaque)
2374: {
2375: BlockDriver *drv = bs->drv;
2376:
1.1.1.18 root 2377: if (bs->open_flags & BDRV_O_NO_FLUSH) {
2378: return bdrv_aio_noop_em(bs, cb, opaque);
2379: }
2380:
1.1.1.14 root 2381: if (!drv)
2382: return NULL;
2383: return drv->bdrv_aio_flush(bs, cb, opaque);
2384: }
2385:
1.1.1.5 root 2386: void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1.1.1.4 root 2387: {
1.1.1.10 root 2388: acb->pool->cancel(acb);
1.1.1.5 root 2389: }
1.1.1.4 root 2390:
2391:
1.1.1.5 root 2392: /**************************************************************/
2393: /* async block device emulation */
1.1.1.4 root 2394:
1.1.1.13 root 2395: typedef struct BlockDriverAIOCBSync {
2396: BlockDriverAIOCB common;
2397: QEMUBH *bh;
2398: int ret;
2399: /* vector translation state */
2400: QEMUIOVector *qiov;
2401: uint8_t *bounce;
2402: int is_write;
2403: } BlockDriverAIOCBSync;
2404:
2405: static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2406: {
1.1.1.18 root 2407: BlockDriverAIOCBSync *acb =
2408: container_of(blockacb, BlockDriverAIOCBSync, common);
1.1.1.13 root 2409: qemu_bh_delete(acb->bh);
2410: acb->bh = NULL;
2411: qemu_aio_release(acb);
2412: }
2413:
2414: static AIOPool bdrv_em_aio_pool = {
2415: .aiocb_size = sizeof(BlockDriverAIOCBSync),
2416: .cancel = bdrv_aio_cancel_em,
2417: };
2418:
1.1.1.5 root 2419: static void bdrv_aio_bh_cb(void *opaque)
1.1.1.4 root 2420: {
1.1.1.5 root 2421: BlockDriverAIOCBSync *acb = opaque;
1.1.1.13 root 2422:
2423: if (!acb->is_write)
2424: qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2425: qemu_vfree(acb->bounce);
1.1.1.5 root 2426: acb->common.cb(acb->common.opaque, acb->ret);
1.1.1.13 root 2427: qemu_bh_delete(acb->bh);
2428: acb->bh = NULL;
1.1.1.5 root 2429: qemu_aio_release(acb);
1.1.1.4 root 2430: }
2431:
1.1.1.13 root 2432: static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2433: int64_t sector_num,
2434: QEMUIOVector *qiov,
2435: int nb_sectors,
2436: BlockDriverCompletionFunc *cb,
2437: void *opaque,
2438: int is_write)
2439:
1.1 root 2440: {
1.1.1.5 root 2441: BlockDriverAIOCBSync *acb;
1.1 root 2442:
1.1.1.13 root 2443: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2444: acb->is_write = is_write;
2445: acb->qiov = qiov;
2446: acb->bounce = qemu_blockalign(bs, qiov->size);
2447:
1.1.1.5 root 2448: if (!acb->bh)
2449: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1.1.1.13 root 2450:
2451: if (is_write) {
2452: qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2453: acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2454: } else {
2455: acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2456: }
2457:
1.1.1.5 root 2458: qemu_bh_schedule(acb->bh);
1.1.1.13 root 2459:
1.1.1.5 root 2460: return &acb->common;
2461: }
1.1 root 2462:
1.1.1.13 root 2463: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2464: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5 root 2465: BlockDriverCompletionFunc *cb, void *opaque)
2466: {
1.1.1.13 root 2467: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1.1.1.5 root 2468: }
2469:
1.1.1.13 root 2470: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2471: int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2472: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 2473: {
1.1.1.13 root 2474: return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1.1 root 2475: }
2476:
1.1.1.14 root 2477: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2478: BlockDriverCompletionFunc *cb, void *opaque)
2479: {
2480: BlockDriverAIOCBSync *acb;
2481:
2482: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2483: acb->is_write = 1; /* don't bounce in the completion hadler */
2484: acb->qiov = NULL;
2485: acb->bounce = NULL;
2486: acb->ret = 0;
2487:
2488: if (!acb->bh)
2489: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2490:
2491: bdrv_flush(bs);
2492: qemu_bh_schedule(acb->bh);
2493: return &acb->common;
2494: }
2495:
1.1.1.18 root 2496: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
2497: BlockDriverCompletionFunc *cb, void *opaque)
2498: {
2499: BlockDriverAIOCBSync *acb;
2500:
2501: acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2502: acb->is_write = 1; /* don't bounce in the completion handler */
2503: acb->qiov = NULL;
2504: acb->bounce = NULL;
2505: acb->ret = 0;
2506:
2507: if (!acb->bh) {
2508: acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2509: }
2510:
2511: qemu_bh_schedule(acb->bh);
2512: return &acb->common;
2513: }
2514:
1.1.1.5 root 2515: /**************************************************************/
2516: /* sync block device emulation */
2517:
2518: static void bdrv_rw_em_cb(void *opaque, int ret)
1.1.1.4 root 2519: {
1.1.1.5 root 2520: *(int *)opaque = ret;
1.1.1.4 root 2521: }
2522:
1.1.1.5 root 2523: #define NOT_DONE 0x7fffffff
2524:
1.1.1.6 root 2525: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5 root 2526: uint8_t *buf, int nb_sectors)
2527: {
2528: int async_ret;
2529: BlockDriverAIOCB *acb;
1.1.1.13 root 2530: struct iovec iov;
2531: QEMUIOVector qiov;
1.1.1.5 root 2532:
1.1.1.14 root 2533: async_context_push();
2534:
1.1.1.5 root 2535: async_ret = NOT_DONE;
1.1.1.13 root 2536: iov.iov_base = (void *)buf;
1.1.1.18 root 2537: iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13 root 2538: qemu_iovec_init_external(&qiov, &iov, 1);
2539: acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2540: bdrv_rw_em_cb, &async_ret);
1.1.1.14 root 2541: if (acb == NULL) {
2542: async_ret = -1;
2543: goto fail;
2544: }
1.1.1.7 root 2545:
1.1.1.5 root 2546: while (async_ret == NOT_DONE) {
2547: qemu_aio_wait();
2548: }
1.1.1.7 root 2549:
1.1.1.14 root 2550:
2551: fail:
2552: async_context_pop();
1.1.1.5 root 2553: return async_ret;
2554: }
2555:
2556: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2557: const uint8_t *buf, int nb_sectors)
2558: {
2559: int async_ret;
2560: BlockDriverAIOCB *acb;
1.1.1.13 root 2561: struct iovec iov;
2562: QEMUIOVector qiov;
1.1.1.5 root 2563:
1.1.1.14 root 2564: async_context_push();
2565:
1.1.1.5 root 2566: async_ret = NOT_DONE;
1.1.1.13 root 2567: iov.iov_base = (void *)buf;
1.1.1.18 root 2568: iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13 root 2569: qemu_iovec_init_external(&qiov, &iov, 1);
2570: acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2571: bdrv_rw_em_cb, &async_ret);
1.1.1.14 root 2572: if (acb == NULL) {
2573: async_ret = -1;
2574: goto fail;
2575: }
1.1.1.5 root 2576: while (async_ret == NOT_DONE) {
2577: qemu_aio_wait();
2578: }
1.1.1.14 root 2579:
2580: fail:
2581: async_context_pop();
1.1.1.5 root 2582: return async_ret;
2583: }
1.1 root 2584:
2585: void bdrv_init(void)
2586: {
1.1.1.13 root 2587: module_call_init(MODULE_INIT_BLOCK);
1.1.1.10 root 2588: }
2589:
1.1.1.14 root 2590: void bdrv_init_with_whitelist(void)
2591: {
2592: use_bdrv_whitelist = 1;
2593: bdrv_init();
2594: }
2595:
1.1.1.13 root 2596: void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2597: BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5 root 2598: {
2599: BlockDriverAIOCB *acb;
2600:
1.1.1.10 root 2601: if (pool->free_aiocb) {
2602: acb = pool->free_aiocb;
2603: pool->free_aiocb = acb->next;
1.1.1.5 root 2604: } else {
1.1.1.10 root 2605: acb = qemu_mallocz(pool->aiocb_size);
2606: acb->pool = pool;
1.1.1.5 root 2607: }
2608: acb->bs = bs;
2609: acb->cb = cb;
2610: acb->opaque = opaque;
2611: return acb;
2612: }
2613:
2614: void qemu_aio_release(void *p)
2615: {
1.1.1.10 root 2616: BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2617: AIOPool *pool = acb->pool;
2618: acb->next = pool->free_aiocb;
2619: pool->free_aiocb = acb;
1.1.1.5 root 2620: }
2621:
2622: /**************************************************************/
2623: /* removable device support */
2624:
2625: /**
2626: * Return TRUE if the media is present
2627: */
2628: int bdrv_is_inserted(BlockDriverState *bs)
2629: {
2630: BlockDriver *drv = bs->drv;
2631: int ret;
2632: if (!drv)
2633: return 0;
2634: if (!drv->bdrv_is_inserted)
1.1.1.18 root 2635: return !bs->tray_open;
1.1.1.5 root 2636: ret = drv->bdrv_is_inserted(bs);
2637: return ret;
2638: }
2639:
2640: /**
2641: * Return TRUE if the media changed since the last call to this
1.1.1.6 root 2642: * function. It is currently only used for floppy disks
1.1.1.5 root 2643: */
2644: int bdrv_media_changed(BlockDriverState *bs)
2645: {
2646: BlockDriver *drv = bs->drv;
2647: int ret;
2648:
2649: if (!drv || !drv->bdrv_media_changed)
2650: ret = -ENOTSUP;
2651: else
2652: ret = drv->bdrv_media_changed(bs);
2653: if (ret == -ENOTSUP)
2654: ret = bs->media_changed;
2655: bs->media_changed = 0;
2656: return ret;
2657: }
2658:
2659: /**
2660: * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2661: */
1.1.1.13 root 2662: int bdrv_eject(BlockDriverState *bs, int eject_flag)
1.1.1.5 root 2663: {
2664: BlockDriver *drv = bs->drv;
2665: int ret;
2666:
1.1.1.13 root 2667: if (bs->locked) {
2668: return -EBUSY;
2669: }
2670:
1.1.1.5 root 2671: if (!drv || !drv->bdrv_eject) {
2672: ret = -ENOTSUP;
2673: } else {
2674: ret = drv->bdrv_eject(bs, eject_flag);
2675: }
2676: if (ret == -ENOTSUP) {
1.1.1.13 root 2677: ret = 0;
1.1.1.5 root 2678: }
1.1.1.18 root 2679: if (ret >= 0) {
2680: bs->tray_open = eject_flag;
2681: }
1.1.1.13 root 2682:
2683: return ret;
1.1.1.5 root 2684: }
2685:
2686: int bdrv_is_locked(BlockDriverState *bs)
2687: {
2688: return bs->locked;
2689: }
2690:
2691: /**
2692: * Lock or unlock the media (if it is locked, the user won't be able
2693: * to eject it manually).
2694: */
2695: void bdrv_set_locked(BlockDriverState *bs, int locked)
2696: {
2697: BlockDriver *drv = bs->drv;
2698:
2699: bs->locked = locked;
2700: if (drv && drv->bdrv_set_locked) {
2701: drv->bdrv_set_locked(bs, locked);
2702: }
1.1 root 2703: }
1.1.1.6 root 2704:
2705: /* needed for generic scsi interface */
2706:
2707: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2708: {
2709: BlockDriver *drv = bs->drv;
2710:
2711: if (drv && drv->bdrv_ioctl)
2712: return drv->bdrv_ioctl(bs, req, buf);
2713: return -ENOTSUP;
2714: }
1.1.1.13 root 2715:
2716: BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2717: unsigned long int req, void *buf,
2718: BlockDriverCompletionFunc *cb, void *opaque)
2719: {
2720: BlockDriver *drv = bs->drv;
2721:
2722: if (drv && drv->bdrv_aio_ioctl)
2723: return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2724: return NULL;
2725: }
2726:
1.1.1.14 root 2727:
2728:
1.1.1.13 root 2729: void *qemu_blockalign(BlockDriverState *bs, size_t size)
2730: {
2731: return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2732: }
1.1.1.14 root 2733:
2734: void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2735: {
2736: int64_t bitmap_size;
2737:
1.1.1.18 root 2738: bs->dirty_count = 0;
1.1.1.14 root 2739: if (enable) {
2740: if (!bs->dirty_bitmap) {
2741: bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2742: BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2743: bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2744:
2745: bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2746: }
2747: } else {
2748: if (bs->dirty_bitmap) {
2749: qemu_free(bs->dirty_bitmap);
2750: bs->dirty_bitmap = NULL;
2751: }
2752: }
2753: }
2754:
2755: int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2756: {
2757: int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2758:
2759: if (bs->dirty_bitmap &&
2760: (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
1.1.1.19! root 2761: return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
! 2762: (1UL << (chunk % (sizeof(unsigned long) * 8))));
1.1.1.14 root 2763: } else {
2764: return 0;
2765: }
2766: }
2767:
2768: void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2769: int nr_sectors)
2770: {
2771: set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2772: }
1.1.1.18 root 2773:
2774: int64_t bdrv_get_dirty_count(BlockDriverState *bs)
2775: {
2776: return bs->dirty_count;
2777: }
1.1.1.19! root 2778:
! 2779: void bdrv_set_in_use(BlockDriverState *bs, int in_use)
! 2780: {
! 2781: assert(bs->in_use != in_use);
! 2782: bs->in_use = in_use;
! 2783: }
! 2784:
! 2785: int bdrv_in_use(BlockDriverState *bs)
! 2786: {
! 2787: return bs->in_use;
! 2788: }
! 2789:
! 2790: int bdrv_img_create(const char *filename, const char *fmt,
! 2791: const char *base_filename, const char *base_fmt,
! 2792: char *options, uint64_t img_size, int flags)
! 2793: {
! 2794: QEMUOptionParameter *param = NULL, *create_options = NULL;
! 2795: QEMUOptionParameter *backing_fmt, *backing_file;
! 2796: BlockDriverState *bs = NULL;
! 2797: BlockDriver *drv, *proto_drv;
! 2798: BlockDriver *backing_drv = NULL;
! 2799: int ret = 0;
! 2800:
! 2801: /* Find driver and parse its options */
! 2802: drv = bdrv_find_format(fmt);
! 2803: if (!drv) {
! 2804: error_report("Unknown file format '%s'", fmt);
! 2805: ret = -EINVAL;
! 2806: goto out;
! 2807: }
! 2808:
! 2809: proto_drv = bdrv_find_protocol(filename);
! 2810: if (!proto_drv) {
! 2811: error_report("Unknown protocol '%s'", filename);
! 2812: ret = -EINVAL;
! 2813: goto out;
! 2814: }
! 2815:
! 2816: create_options = append_option_parameters(create_options,
! 2817: drv->create_options);
! 2818: create_options = append_option_parameters(create_options,
! 2819: proto_drv->create_options);
! 2820:
! 2821: /* Create parameter list with default values */
! 2822: param = parse_option_parameters("", create_options, param);
! 2823:
! 2824: set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
! 2825:
! 2826: /* Parse -o options */
! 2827: if (options) {
! 2828: param = parse_option_parameters(options, create_options, param);
! 2829: if (param == NULL) {
! 2830: error_report("Invalid options for file format '%s'.", fmt);
! 2831: ret = -EINVAL;
! 2832: goto out;
! 2833: }
! 2834: }
! 2835:
! 2836: if (base_filename) {
! 2837: if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
! 2838: base_filename)) {
! 2839: error_report("Backing file not supported for file format '%s'",
! 2840: fmt);
! 2841: ret = -EINVAL;
! 2842: goto out;
! 2843: }
! 2844: }
! 2845:
! 2846: if (base_fmt) {
! 2847: if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
! 2848: error_report("Backing file format not supported for file "
! 2849: "format '%s'", fmt);
! 2850: ret = -EINVAL;
! 2851: goto out;
! 2852: }
! 2853: }
! 2854:
! 2855: backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
! 2856: if (backing_file && backing_file->value.s) {
! 2857: if (!strcmp(filename, backing_file->value.s)) {
! 2858: error_report("Error: Trying to create an image with the "
! 2859: "same filename as the backing file");
! 2860: ret = -EINVAL;
! 2861: goto out;
! 2862: }
! 2863: }
! 2864:
! 2865: backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
! 2866: if (backing_fmt && backing_fmt->value.s) {
! 2867: backing_drv = bdrv_find_format(backing_fmt->value.s);
! 2868: if (!backing_drv) {
! 2869: error_report("Unknown backing file format '%s'",
! 2870: backing_fmt->value.s);
! 2871: ret = -EINVAL;
! 2872: goto out;
! 2873: }
! 2874: }
! 2875:
! 2876: // The size for the image must always be specified, with one exception:
! 2877: // If we are using a backing file, we can obtain the size from there
! 2878: if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
! 2879: if (backing_file && backing_file->value.s) {
! 2880: uint64_t size;
! 2881: char buf[32];
! 2882:
! 2883: bs = bdrv_new("");
! 2884:
! 2885: ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
! 2886: if (ret < 0) {
! 2887: error_report("Could not open '%s'", backing_file->value.s);
! 2888: goto out;
! 2889: }
! 2890: bdrv_get_geometry(bs, &size);
! 2891: size *= 512;
! 2892:
! 2893: snprintf(buf, sizeof(buf), "%" PRId64, size);
! 2894: set_option_parameter(param, BLOCK_OPT_SIZE, buf);
! 2895: } else {
! 2896: error_report("Image creation needs a size parameter");
! 2897: ret = -EINVAL;
! 2898: goto out;
! 2899: }
! 2900: }
! 2901:
! 2902: printf("Formatting '%s', fmt=%s ", filename, fmt);
! 2903: print_option_parameters(param);
! 2904: puts("");
! 2905:
! 2906: ret = bdrv_create(drv, filename, param);
! 2907:
! 2908: if (ret < 0) {
! 2909: if (ret == -ENOTSUP) {
! 2910: error_report("Formatting or formatting option not supported for "
! 2911: "file format '%s'", fmt);
! 2912: } else if (ret == -EFBIG) {
! 2913: error_report("The image size is too large for file format '%s'",
! 2914: fmt);
! 2915: } else {
! 2916: error_report("%s: error while creating %s: %s", filename, fmt,
! 2917: strerror(-ret));
! 2918: }
! 2919: }
! 2920:
! 2921: out:
! 2922: free_option_parameters(create_options);
! 2923: free_option_parameters(param);
! 2924:
! 2925: if (bs) {
! 2926: bdrv_delete(bs);
! 2927: }
! 2928:
! 2929: return ret;
! 2930: }
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