block.c 67.5 KB
Newer Older
B
bellard 已提交
1 2
/*
 * QEMU System Emulator block driver
3
 *
B
bellard 已提交
4
 * Copyright (c) 2003 Fabrice Bellard
5
 *
B
bellard 已提交
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
24
#include "config-host.h"
P
pbrook 已提交
25
#include "qemu-common.h"
A
aliguori 已提交
26
#include "monitor.h"
B
bellard 已提交
27
#include "block_int.h"
28
#include "module.h"
29
#include "qemu-objects.h"
B
bellard 已提交
30

J
Juan Quintela 已提交
31
#ifdef CONFIG_BSD
B
bellard 已提交
32 33 34
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
B
Blue Swirl 已提交
35
#include <sys/queue.h>
36
#ifndef __DragonFly__
B
bellard 已提交
37 38
#include <sys/disk.h>
#endif
39
#endif
B
bellard 已提交
40

41 42 43 44
#ifdef _WIN32
#include <windows.h>
#endif

45 46
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
47
        BlockDriverCompletionFunc *cb, void *opaque);
48 49
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
50
        BlockDriverCompletionFunc *cb, void *opaque);
51 52
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
53 54
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
55
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
B
bellard 已提交
56 57 58
                        uint8_t *buf, int nb_sectors);
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors);
B
bellard 已提交
59

60 61
static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
    QTAILQ_HEAD_INITIALIZER(bdrv_states);
62

63 64
static QLIST_HEAD(, BlockDriver) bdrv_drivers =
    QLIST_HEAD_INITIALIZER(bdrv_drivers);
B
bellard 已提交
65

66 67 68
/* If non-zero, use only whitelisted block drivers */
static int use_bdrv_whitelist;

B
bellard 已提交
69
int path_is_absolute(const char *path)
70
{
B
bellard 已提交
71
    const char *p;
B
bellard 已提交
72 73 74 75 76
#ifdef _WIN32
    /* specific case for names like: "\\.\d:" */
    if (*path == '/' || *path == '\\')
        return 1;
#endif
B
bellard 已提交
77 78 79 80 81
    p = strchr(path, ':');
    if (p)
        p++;
    else
        p = path;
82 83 84 85 86
#ifdef _WIN32
    return (*p == '/' || *p == '\\');
#else
    return (*p == '/');
#endif
87 88
}

B
bellard 已提交
89 90 91 92 93 94
/* if filename is absolute, just copy it to dest. Otherwise, build a
   path to it by considering it is relative to base_path. URL are
   supported. */
void path_combine(char *dest, int dest_size,
                  const char *base_path,
                  const char *filename)
95
{
B
bellard 已提交
96 97 98 99 100 101 102 103 104 105 106 107 108
    const char *p, *p1;
    int len;

    if (dest_size <= 0)
        return;
    if (path_is_absolute(filename)) {
        pstrcpy(dest, dest_size, filename);
    } else {
        p = strchr(base_path, ':');
        if (p)
            p++;
        else
            p = base_path;
109 110 111 112 113 114 115 116 117
        p1 = strrchr(base_path, '/');
#ifdef _WIN32
        {
            const char *p2;
            p2 = strrchr(base_path, '\\');
            if (!p1 || p2 > p1)
                p1 = p2;
        }
#endif
B
bellard 已提交
118 119 120 121 122 123 124 125 126 127 128 129
        if (p1)
            p1++;
        else
            p1 = base_path;
        if (p1 > p)
            p = p1;
        len = p - base_path;
        if (len > dest_size - 1)
            len = dest_size - 1;
        memcpy(dest, base_path, len);
        dest[len] = '\0';
        pstrcat(dest, dest_size, filename);
130 131 132
    }
}

133
void bdrv_register(BlockDriver *bdrv)
B
bellard 已提交
134
{
135
    if (!bdrv->bdrv_aio_readv) {
B
bellard 已提交
136
        /* add AIO emulation layer */
137 138
        bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
        bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
139
    } else if (!bdrv->bdrv_read) {
B
bellard 已提交
140 141 142 143
        /* add synchronous IO emulation layer */
        bdrv->bdrv_read = bdrv_read_em;
        bdrv->bdrv_write = bdrv_write_em;
    }
144 145 146 147

    if (!bdrv->bdrv_aio_flush)
        bdrv->bdrv_aio_flush = bdrv_aio_flush_em;

148
    QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
B
bellard 已提交
149
}
B
bellard 已提交
150 151 152 153

/* create a new block device (by default it is empty) */
BlockDriverState *bdrv_new(const char *device_name)
{
154
    BlockDriverState *bs;
B
bellard 已提交
155 156 157

    bs = qemu_mallocz(sizeof(BlockDriverState));
    pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
B
bellard 已提交
158
    if (device_name[0] != '\0') {
159
        QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
B
bellard 已提交
160
    }
B
bellard 已提交
161 162 163
    return bs;
}

B
bellard 已提交
164 165 166
BlockDriver *bdrv_find_format(const char *format_name)
{
    BlockDriver *drv1;
167 168
    QLIST_FOREACH(drv1, &bdrv_drivers, list) {
        if (!strcmp(drv1->format_name, format_name)) {
B
bellard 已提交
169
            return drv1;
170
        }
B
bellard 已提交
171 172 173 174
    }
    return NULL;
}

175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
static int bdrv_is_whitelisted(BlockDriver *drv)
{
    static const char *whitelist[] = {
        CONFIG_BDRV_WHITELIST
    };
    const char **p;

    if (!whitelist[0])
        return 1;               /* no whitelist, anything goes */

    for (p = whitelist; *p; p++) {
        if (!strcmp(drv->format_name, *p)) {
            return 1;
        }
    }
    return 0;
}

BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
{
    BlockDriver *drv = bdrv_find_format(format_name);
    return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
}

199 200
int bdrv_create(BlockDriver *drv, const char* filename,
    QEMUOptionParameter *options)
B
bellard 已提交
201 202 203
{
    if (!drv->bdrv_create)
        return -ENOTSUP;
204 205

    return drv->bdrv_create(filename, options);
B
bellard 已提交
206 207
}

208 209 210 211
int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
{
    BlockDriver *drv;

212
    drv = bdrv_find_protocol(filename);
213 214 215 216 217 218 219
    if (drv == NULL) {
        drv = bdrv_find_format("file");
    }

    return bdrv_create(drv, filename, options);
}

B
bellard 已提交
220
#ifdef _WIN32
221
void get_tmp_filename(char *filename, int size)
B
bellard 已提交
222
{
223
    char temp_dir[MAX_PATH];
224

225 226
    GetTempPath(MAX_PATH, temp_dir);
    GetTempFileName(temp_dir, "qem", 0, filename);
B
bellard 已提交
227 228
}
#else
229
void get_tmp_filename(char *filename, int size)
B
bellard 已提交
230
{
B
bellard 已提交
231
    int fd;
232
    const char *tmpdir;
B
bellard 已提交
233
    /* XXX: race condition possible */
A
aurel32 已提交
234 235 236 237
    tmpdir = getenv("TMPDIR");
    if (!tmpdir)
        tmpdir = "/tmp";
    snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
B
bellard 已提交
238 239 240
    fd = mkstemp(filename);
    close(fd);
}
B
bellard 已提交
241
#endif
B
bellard 已提交
242

B
bellard 已提交
243
#ifdef _WIN32
B
bellard 已提交
244 245 246 247 248 249
static int is_windows_drive_prefix(const char *filename)
{
    return (((filename[0] >= 'a' && filename[0] <= 'z') ||
             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
            filename[1] == ':');
}
250

251
int is_windows_drive(const char *filename)
B
bellard 已提交
252
{
253
    if (is_windows_drive_prefix(filename) &&
B
bellard 已提交
254
        filename[2] == '\0')
B
bellard 已提交
255 256 257 258 259 260 261 262
        return 1;
    if (strstart(filename, "\\\\.\\", NULL) ||
        strstart(filename, "//./", NULL))
        return 1;
    return 0;
}
#endif

263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
/*
 * Detect host devices. By convention, /dev/cdrom[N] is always
 * recognized as a host CDROM.
 */
static BlockDriver *find_hdev_driver(const char *filename)
{
    int score_max = 0, score;
    BlockDriver *drv = NULL, *d;

    QLIST_FOREACH(d, &bdrv_drivers, list) {
        if (d->bdrv_probe_device) {
            score = d->bdrv_probe_device(filename);
            if (score > score_max) {
                score_max = score;
                drv = d;
            }
        }
    }

    return drv;
}

285
BlockDriver *bdrv_find_protocol(const char *filename)
B
bellard 已提交
286 287 288
{
    BlockDriver *drv1;
    char protocol[128];
289
    int len;
B
bellard 已提交
290
    const char *p;
B
bellard 已提交
291

292 293
    /* TODO Drivers without bdrv_file_open must be specified explicitly */

294 295 296 297 298 299 300 301 302 303 304 305
    /*
     * XXX(hch): we really should not let host device detection
     * override an explicit protocol specification, but moving this
     * later breaks access to device names with colons in them.
     * Thanks to the brain-dead persistent naming schemes on udev-
     * based Linux systems those actually are quite common.
     */
    drv1 = find_hdev_driver(filename);
    if (drv1) {
        return drv1;
    }

B
bellard 已提交
306
#ifdef _WIN32
307 308 309
     if (is_windows_drive(filename) ||
         is_windows_drive_prefix(filename))
         return bdrv_find_format("file");
B
bellard 已提交
310
#endif
311

312
    p = strchr(filename, ':');
313 314
    if (!p) {
        return bdrv_find_format("file");
315
    }
316 317 318 319 320
    len = p - filename;
    if (len > sizeof(protocol) - 1)
        len = sizeof(protocol) - 1;
    memcpy(protocol, filename, len);
    protocol[len] = '\0';
321
    QLIST_FOREACH(drv1, &bdrv_drivers, list) {
322
        if (drv1->protocol_name &&
323
            !strcmp(drv1->protocol_name, protocol)) {
B
bellard 已提交
324
            return drv1;
325
        }
B
bellard 已提交
326 327 328 329
    }
    return NULL;
}

330 331 332 333 334 335 336
static BlockDriver *find_image_format(const char *filename)
{
    int ret, score, score_max;
    BlockDriver *drv1, *drv;
    uint8_t buf[2048];
    BlockDriverState *bs;

337
    ret = bdrv_file_open(&bs, filename, 0);
B
bellard 已提交
338 339
    if (ret < 0)
        return NULL;
340

341 342
    /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
    if (bs->sg || !bdrv_is_inserted(bs)) {
343
        bdrv_delete(bs);
344
        return bdrv_find_format("raw");
345
    }
346

B
bellard 已提交
347 348 349 350 351 352
    ret = bdrv_pread(bs, 0, buf, sizeof(buf));
    bdrv_delete(bs);
    if (ret < 0) {
        return NULL;
    }

B
bellard 已提交
353
    score_max = 0;
354
    drv = NULL;
355
    QLIST_FOREACH(drv1, &bdrv_drivers, list) {
B
bellard 已提交
356 357 358 359 360 361
        if (drv1->bdrv_probe) {
            score = drv1->bdrv_probe(buf, ret, filename);
            if (score > score_max) {
                score_max = score;
                drv = drv1;
            }
B
bellard 已提交
362
        }
B
bellard 已提交
363
    }
B
bellard 已提交
364 365 366
    return drv;
}

367 368 369 370 371 372 373
/**
 * Set the current 'total_sectors' value
 */
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
{
    BlockDriver *drv = bs->drv;

374 375 376 377
    /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
    if (bs->sg)
        return 0;

378 379 380 381 382 383 384 385 386 387 388 389 390
    /* query actual device if possible, otherwise just trust the hint */
    if (drv->bdrv_getlength) {
        int64_t length = drv->bdrv_getlength(bs);
        if (length < 0) {
            return length;
        }
        hint = length >> BDRV_SECTOR_BITS;
    }

    bs->total_sectors = hint;
    return 0;
}

391 392 393 394 395 396 397 398 399 400
/*
 * Common part for opening disk images and files
 */
static int bdrv_open_common(BlockDriverState *bs, const char *filename,
    int flags, BlockDriver *drv)
{
    int ret, open_flags;

    assert(drv != NULL);

401
    bs->file = NULL;
402
    bs->total_sectors = 0;
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
    bs->encrypted = 0;
    bs->valid_key = 0;
    bs->open_flags = flags;
    /* buffer_alignment defaulted to 512, drivers can change this value */
    bs->buffer_alignment = 512;

    pstrcpy(bs->filename, sizeof(bs->filename), filename);

    if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
        return -ENOTSUP;
    }

    bs->drv = drv;
    bs->opaque = qemu_mallocz(drv->instance_size);

    /*
     * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
     * write cache to the guest.  We do need the fdatasync to flush
     * out transactions for block allocations, and we maybe have a
     * volatile write cache in our backing device to deal with.
     */
    if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
        bs->enable_write_cache = 1;

    /*
     * Clear flags that are internal to the block layer before opening the
     * image.
     */
    open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);

    /*
     * Snapshots should be writeable.
     */
    if (bs->is_temporary) {
        open_flags |= BDRV_O_RDWR;
    }

440 441 442 443 444 445 446 447 448 449
    /* Open the image, either directly or using a protocol */
    if (drv->bdrv_file_open) {
        ret = drv->bdrv_file_open(bs, filename, open_flags);
    } else {
        ret = bdrv_file_open(&bs->file, filename, open_flags);
        if (ret >= 0) {
            ret = drv->bdrv_open(bs, open_flags);
        }
    }

450 451 452 453 454
    if (ret < 0) {
        goto free_and_fail;
    }

    bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
455 456 457 458

    ret = refresh_total_sectors(bs, bs->total_sectors);
    if (ret < 0) {
        goto free_and_fail;
459
    }
460

461 462 463 464 465 466 467 468
#ifndef _WIN32
    if (bs->is_temporary) {
        unlink(filename);
    }
#endif
    return 0;

free_and_fail:
469 470 471 472
    if (bs->file) {
        bdrv_delete(bs->file);
        bs->file = NULL;
    }
473 474 475 476 477 478
    qemu_free(bs->opaque);
    bs->opaque = NULL;
    bs->drv = NULL;
    return ret;
}

K
Kevin Wolf 已提交
479 480 481
/*
 * Opens a file using a protocol (file, host_device, nbd, ...)
 */
B
bellard 已提交
482
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
B
bellard 已提交
483
{
B
bellard 已提交
484
    BlockDriverState *bs;
485
    BlockDriver *drv;
B
bellard 已提交
486 487
    int ret;

488
    drv = bdrv_find_protocol(filename);
489 490 491 492
    if (!drv) {
        return -ENOENT;
    }

B
bellard 已提交
493
    bs = bdrv_new("");
K
Kevin Wolf 已提交
494
    ret = bdrv_open_common(bs, filename, flags, drv);
B
bellard 已提交
495 496 497
    if (ret < 0) {
        bdrv_delete(bs);
        return ret;
498
    }
499
    bs->growable = 1;
B
bellard 已提交
500 501 502 503
    *pbs = bs;
    return 0;
}

K
Kevin Wolf 已提交
504 505 506
/*
 * Opens a disk image (raw, qcow2, vmdk, ...)
 */
K
Kevin Wolf 已提交
507 508
int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
              BlockDriver *drv)
B
bellard 已提交
509
{
K
Kevin Wolf 已提交
510
    int ret;
B
bellard 已提交
511

B
bellard 已提交
512
    if (flags & BDRV_O_SNAPSHOT) {
B
bellard 已提交
513 514
        BlockDriverState *bs1;
        int64_t total_size;
A
aliguori 已提交
515
        int is_protocol = 0;
K
Kevin Wolf 已提交
516 517
        BlockDriver *bdrv_qcow2;
        QEMUOptionParameter *options;
K
Kevin Wolf 已提交
518 519
        char tmp_filename[PATH_MAX];
        char backing_filename[PATH_MAX];
520

B
bellard 已提交
521 522
        /* if snapshot, we create a temporary backing file and open it
           instead of opening 'filename' directly */
523

B
bellard 已提交
524 525
        /* if there is a backing file, use it */
        bs1 = bdrv_new("");
K
Kevin Wolf 已提交
526
        ret = bdrv_open(bs1, filename, 0, drv);
527
        if (ret < 0) {
B
bellard 已提交
528
            bdrv_delete(bs1);
529
            return ret;
B
bellard 已提交
530
        }
531
        total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
A
aliguori 已提交
532 533 534 535

        if (bs1->drv && bs1->drv->protocol_name)
            is_protocol = 1;

B
bellard 已提交
536
        bdrv_delete(bs1);
537

B
bellard 已提交
538
        get_tmp_filename(tmp_filename, sizeof(tmp_filename));
A
aliguori 已提交
539 540 541 542 543

        /* Real path is meaningless for protocols */
        if (is_protocol)
            snprintf(backing_filename, sizeof(backing_filename),
                     "%s", filename);
544 545
        else if (!realpath(filename, backing_filename))
            return -errno;
A
aliguori 已提交
546

K
Kevin Wolf 已提交
547 548 549
        bdrv_qcow2 = bdrv_find_format("qcow2");
        options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);

550
        set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
K
Kevin Wolf 已提交
551 552 553 554 555 556 557
        set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
        if (drv) {
            set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
                drv->format_name);
        }

        ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
558
        free_option_parameters(options);
559 560
        if (ret < 0) {
            return ret;
B
bellard 已提交
561
        }
K
Kevin Wolf 已提交
562

B
bellard 已提交
563
        filename = tmp_filename;
K
Kevin Wolf 已提交
564
        drv = bdrv_qcow2;
B
bellard 已提交
565 566
        bs->is_temporary = 1;
    }
B
bellard 已提交
567

K
Kevin Wolf 已提交
568
    /* Find the right image format driver */
569
    if (!drv) {
570
        drv = find_image_format(filename);
571
    }
572

573 574 575
    if (!drv) {
        ret = -ENOENT;
        goto unlink_and_fail;
B
bellard 已提交
576
    }
K
Kevin Wolf 已提交
577 578 579 580

    /* Open the image */
    ret = bdrv_open_common(bs, filename, flags, drv);
    if (ret < 0) {
581 582 583
        goto unlink_and_fail;
    }

K
Kevin Wolf 已提交
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
    /* If there is a backing file, use it */
    if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
        char backing_filename[PATH_MAX];
        int back_flags;
        BlockDriver *back_drv = NULL;

        bs->backing_hd = bdrv_new("");
        path_combine(backing_filename, sizeof(backing_filename),
                     filename, bs->backing_file);
        if (bs->backing_format[0] != '\0')
            back_drv = bdrv_find_format(bs->backing_format);

        /* backing files always opened read-only */
        back_flags =
            flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);

        ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
        if (ret < 0) {
            bdrv_close(bs);
            return ret;
        }
        if (bs->is_temporary) {
            bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
        } else {
            /* base image inherits from "parent" */
            bs->backing_hd->keep_read_only = bs->keep_read_only;
        }
    }

    if (!bdrv_key_required(bs)) {
        /* call the change callback */
        bs->media_changed = 1;
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }

    return 0;

unlink_and_fail:
    if (bs->is_temporary) {
        unlink(filename);
    }
    return ret;
}

B
bellard 已提交
629 630
void bdrv_close(BlockDriverState *bs)
{
B
bellard 已提交
631
    if (bs->drv) {
632
        if (bs->backing_hd) {
B
bellard 已提交
633
            bdrv_delete(bs->backing_hd);
634 635
            bs->backing_hd = NULL;
        }
B
bellard 已提交
636 637 638 639 640 641
        bs->drv->bdrv_close(bs);
        qemu_free(bs->opaque);
#ifdef _WIN32
        if (bs->is_temporary) {
            unlink(bs->filename);
        }
B
bellard 已提交
642
#endif
B
bellard 已提交
643 644
        bs->opaque = NULL;
        bs->drv = NULL;
B
bellard 已提交
645

646 647 648 649
        if (bs->file != NULL) {
            bdrv_close(bs->file);
        }

B
bellard 已提交
650
        /* call the change callback */
B
bellard 已提交
651
        bs->media_changed = 1;
B
bellard 已提交
652 653 654 655 656
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
}

657 658 659 660 661 662 663 664 665
void bdrv_close_all(void)
{
    BlockDriverState *bs;

    QTAILQ_FOREACH(bs, &bdrv_states, list) {
        bdrv_close(bs);
    }
}

B
bellard 已提交
666 667
void bdrv_delete(BlockDriverState *bs)
{
668 669 670 671
    /* remove from list, if necessary */
    if (bs->device_name[0] != '\0') {
        QTAILQ_REMOVE(&bdrv_states, bs, list);
    }
672

B
bellard 已提交
673
    bdrv_close(bs);
674 675 676 677
    if (bs->file != NULL) {
        bdrv_delete(bs->file);
    }

B
bellard 已提交
678
    qemu_free(bs);
B
bellard 已提交
679 680
}

A
aliguori 已提交
681 682 683 684 685 686 687 688 689 690 691 692 693 694
/*
 * Run consistency checks on an image
 *
 * Returns the number of errors or -errno when an internal error occurs
 */
int bdrv_check(BlockDriverState *bs)
{
    if (bs->drv->bdrv_check == NULL) {
        return -ENOTSUP;
    }

    return bs->drv->bdrv_check(bs);
}

695 696 697
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
B
bellard 已提交
698
    BlockDriver *drv = bs->drv;
B
bellard 已提交
699
    int64_t i, total_sectors;
700 701
    int n, j, ro, open_flags;
    int ret = 0, rw_ret = 0;
702
    unsigned char sector[BDRV_SECTOR_SIZE];
703 704
    char filename[1024];
    BlockDriverState *bs_rw, *bs_ro;
705

B
bellard 已提交
706 707
    if (!drv)
        return -ENOMEDIUM;
708 709 710
    
    if (!bs->backing_hd) {
        return -ENOTSUP;
711 712
    }

713 714 715 716 717 718 719 720 721 722 723 724 725
    if (bs->backing_hd->keep_read_only) {
        return -EACCES;
    }
    
    ro = bs->backing_hd->read_only;
    strncpy(filename, bs->backing_hd->filename, sizeof(filename));
    open_flags =  bs->backing_hd->open_flags;

    if (ro) {
        /* re-open as RW */
        bdrv_delete(bs->backing_hd);
        bs->backing_hd = NULL;
        bs_rw = bdrv_new("");
K
Kevin Wolf 已提交
726
        rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv);
727 728 729 730
        if (rw_ret < 0) {
            bdrv_delete(bs_rw);
            /* try to re-open read-only */
            bs_ro = bdrv_new("");
K
Kevin Wolf 已提交
731
            ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
732 733 734 735 736 737 738 739 740 741
            if (ret < 0) {
                bdrv_delete(bs_ro);
                /* drive not functional anymore */
                bs->drv = NULL;
                return ret;
            }
            bs->backing_hd = bs_ro;
            return rw_ret;
        }
        bs->backing_hd = bs_rw;
B
bellard 已提交
742
    }
743

J
Jan Kiszka 已提交
744
    total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
B
bellard 已提交
745
    for (i = 0; i < total_sectors;) {
B
bellard 已提交
746
        if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
B
bellard 已提交
747 748
            for(j = 0; j < n; j++) {
                if (bdrv_read(bs, i, sector, 1) != 0) {
749 750
                    ret = -EIO;
                    goto ro_cleanup;
B
bellard 已提交
751 752 753
                }

                if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
754 755
                    ret = -EIO;
                    goto ro_cleanup;
B
bellard 已提交
756 757
                }
                i++;
758
	    }
B
bellard 已提交
759 760 761
	} else {
            i += n;
        }
762
    }
763

764 765 766 767
    if (drv->bdrv_make_empty) {
        ret = drv->bdrv_make_empty(bs);
        bdrv_flush(bs);
    }
768

769 770 771 772 773 774
    /*
     * Make sure all data we wrote to the backing device is actually
     * stable on disk.
     */
    if (bs->backing_hd)
        bdrv_flush(bs->backing_hd);
775 776 777 778 779 780 781 782

ro_cleanup:

    if (ro) {
        /* re-open as RO */
        bdrv_delete(bs->backing_hd);
        bs->backing_hd = NULL;
        bs_ro = bdrv_new("");
K
Kevin Wolf 已提交
783
        ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
784 785 786 787 788 789 790 791 792 793
        if (ret < 0) {
            bdrv_delete(bs_ro);
            /* drive not functional anymore */
            bs->drv = NULL;
            return ret;
        }
        bs->backing_hd = bs_ro;
        bs->backing_hd->keep_read_only = 0;
    }

794
    return ret;
795 796
}

797 798 799 800 801 802 803 804 805
void bdrv_commit_all(void)
{
    BlockDriverState *bs;

    QTAILQ_FOREACH(bs, &bdrv_states, list) {
        bdrv_commit(bs);
    }
}

K
Kevin Wolf 已提交
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
/*
 * Return values:
 * 0        - success
 * -EINVAL  - backing format specified, but no file
 * -ENOSPC  - can't update the backing file because no space is left in the
 *            image file header
 * -ENOTSUP - format driver doesn't support changing the backing file
 */
int bdrv_change_backing_file(BlockDriverState *bs,
    const char *backing_file, const char *backing_fmt)
{
    BlockDriver *drv = bs->drv;

    if (drv->bdrv_change_backing_file != NULL) {
        return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
    } else {
        return -ENOTSUP;
    }
}

826 827 828 829 830 831 832 833 834 835 836 837 838
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
                                   size_t size)
{
    int64_t len;

    if (!bdrv_is_inserted(bs))
        return -ENOMEDIUM;

    if (bs->growable)
        return 0;

    len = bdrv_getlength(bs);

K
Kevin Wolf 已提交
839 840 841 842
    if (offset < 0)
        return -EIO;

    if ((offset > len) || (len - offset < size))
843 844 845 846 847 848 849 850
        return -EIO;

    return 0;
}

static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
                              int nb_sectors)
{
851 852
    return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
                                   nb_sectors * BDRV_SECTOR_SIZE);
853 854
}

B
bellard 已提交
855
/* return < 0 if error. See bdrv_write() for the return codes */
856
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
B
bellard 已提交
857 858
              uint8_t *buf, int nb_sectors)
{
B
bellard 已提交
859 860
    BlockDriver *drv = bs->drv;

B
bellard 已提交
861 862
    if (!drv)
        return -ENOMEDIUM;
863 864
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return -EIO;
B
bellard 已提交
865

866
    return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
B
bellard 已提交
867 868
}

869
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
870
                             int nb_sectors, int dirty)
871 872
{
    int64_t start, end;
873
    unsigned long val, idx, bit;
874

J
Jan Kiszka 已提交
875
    start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
876
    end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
877 878

    for (; start <= end; start++) {
879 880 881 882
        idx = start / (sizeof(unsigned long) * 8);
        bit = start % (sizeof(unsigned long) * 8);
        val = bs->dirty_bitmap[idx];
        if (dirty) {
883 884 885 886
            if (!(val & (1 << bit))) {
                bs->dirty_count++;
                val |= 1 << bit;
            }
887
        } else {
888 889 890 891
            if (val & (1 << bit)) {
                bs->dirty_count--;
                val &= ~(1 << bit);
            }
892 893
        }
        bs->dirty_bitmap[idx] = val;
894 895 896
    }
}

897
/* Return < 0 if error. Important errors are:
B
bellard 已提交
898 899 900 901 902
  -EIO         generic I/O error (may happen for all errors)
  -ENOMEDIUM   No media inserted.
  -EINVAL      Invalid sector number or nb_sectors
  -EACCES      Trying to write a read-only device
*/
903
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
B
bellard 已提交
904 905
               const uint8_t *buf, int nb_sectors)
{
B
bellard 已提交
906
    BlockDriver *drv = bs->drv;
B
bellard 已提交
907 908
    if (!bs->drv)
        return -ENOMEDIUM;
B
bellard 已提交
909
    if (bs->read_only)
B
bellard 已提交
910
        return -EACCES;
911 912
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return -EIO;
913

914
    if (bs->dirty_bitmap) {
915 916
        set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
    }
917

918 919 920 921
    if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
        bs->wr_highest_sector = sector_num + nb_sectors - 1;
    }

922
    return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
B
bellard 已提交
923 924
}

925 926
int bdrv_pread(BlockDriverState *bs, int64_t offset,
               void *buf, int count1)
B
bellard 已提交
927
{
J
Jan Kiszka 已提交
928
    uint8_t tmp_buf[BDRV_SECTOR_SIZE];
B
bellard 已提交
929 930
    int len, nb_sectors, count;
    int64_t sector_num;
931
    int ret;
B
bellard 已提交
932 933 934

    count = count1;
    /* first read to align to sector start */
J
Jan Kiszka 已提交
935
    len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
B
bellard 已提交
936 937
    if (len > count)
        len = count;
J
Jan Kiszka 已提交
938
    sector_num = offset >> BDRV_SECTOR_BITS;
B
bellard 已提交
939
    if (len > 0) {
940 941
        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
J
Jan Kiszka 已提交
942
        memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
B
bellard 已提交
943 944 945 946 947 948 949 950
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* read the sectors "in place" */
J
Jan Kiszka 已提交
951
    nb_sectors = count >> BDRV_SECTOR_BITS;
B
bellard 已提交
952
    if (nb_sectors > 0) {
953 954
        if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
            return ret;
B
bellard 已提交
955
        sector_num += nb_sectors;
J
Jan Kiszka 已提交
956
        len = nb_sectors << BDRV_SECTOR_BITS;
B
bellard 已提交
957 958 959 960 961 962
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
963 964
        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
B
bellard 已提交
965 966 967 968 969
        memcpy(buf, tmp_buf, count);
    }
    return count1;
}

970 971
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                const void *buf, int count1)
B
bellard 已提交
972
{
J
Jan Kiszka 已提交
973
    uint8_t tmp_buf[BDRV_SECTOR_SIZE];
B
bellard 已提交
974 975
    int len, nb_sectors, count;
    int64_t sector_num;
976
    int ret;
B
bellard 已提交
977 978 979

    count = count1;
    /* first write to align to sector start */
J
Jan Kiszka 已提交
980
    len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
B
bellard 已提交
981 982
    if (len > count)
        len = count;
J
Jan Kiszka 已提交
983
    sector_num = offset >> BDRV_SECTOR_BITS;
B
bellard 已提交
984
    if (len > 0) {
985 986
        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
J
Jan Kiszka 已提交
987
        memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
988 989
        if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
B
bellard 已提交
990 991 992 993 994 995 996 997
        count -= len;
        if (count == 0)
            return count1;
        sector_num++;
        buf += len;
    }

    /* write the sectors "in place" */
J
Jan Kiszka 已提交
998
    nb_sectors = count >> BDRV_SECTOR_BITS;
B
bellard 已提交
999
    if (nb_sectors > 0) {
1000 1001
        if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
            return ret;
B
bellard 已提交
1002
        sector_num += nb_sectors;
J
Jan Kiszka 已提交
1003
        len = nb_sectors << BDRV_SECTOR_BITS;
B
bellard 已提交
1004 1005 1006 1007 1008 1009
        buf += len;
        count -= len;
    }

    /* add data from the last sector */
    if (count > 0) {
1010 1011
        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
B
bellard 已提交
1012
        memcpy(tmp_buf, buf, count);
1013 1014
        if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
            return ret;
B
bellard 已提交
1015 1016 1017 1018
    }
    return count1;
}

K
Kevin Wolf 已提交
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
/*
 * Writes to the file and ensures that no writes are reordered across this
 * request (acts as a barrier)
 *
 * Returns 0 on success, -errno in error cases.
 */
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
    const void *buf, int count)
{
    int ret;

    ret = bdrv_pwrite(bs, offset, buf, count);
    if (ret < 0) {
        return ret;
    }

    /* No flush needed for cache=writethrough, it uses O_DSYNC */
    if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
        bdrv_flush(bs);
    }

    return 0;
}

/*
 * Writes to the file and ensures that no writes are reordered across this
 * request (acts as a barrier)
 *
 * Returns 0 on success, -errno in error cases.
 */
int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
    const uint8_t *buf, int nb_sectors)
{
    return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
        buf, BDRV_SECTOR_SIZE * nb_sectors);
}

B
bellard 已提交
1056 1057 1058 1059 1060 1061
/**
 * Truncate file to 'offset' bytes (needed only for file protocols)
 */
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
{
    BlockDriver *drv = bs->drv;
1062
    int ret;
B
bellard 已提交
1063
    if (!drv)
B
bellard 已提交
1064
        return -ENOMEDIUM;
B
bellard 已提交
1065 1066
    if (!drv->bdrv_truncate)
        return -ENOTSUP;
1067 1068
    if (bs->read_only)
        return -EACCES;
1069 1070 1071 1072 1073
    ret = drv->bdrv_truncate(bs, offset);
    if (ret == 0) {
        ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
    }
    return ret;
B
bellard 已提交
1074 1075 1076 1077 1078 1079 1080 1081 1082
}

/**
 * Length of a file in bytes. Return < 0 if error or unknown.
 */
int64_t bdrv_getlength(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1083
        return -ENOMEDIUM;
1084 1085 1086 1087 1088 1089

    /* Fixed size devices use the total_sectors value for speed instead of
       issuing a length query (like lseek) on each call.  Also, legacy block
       drivers don't provide a bdrv_getlength function and must use
       total_sectors. */
    if (!bs->growable || !drv->bdrv_getlength) {
J
Jan Kiszka 已提交
1090
        return bs->total_sectors * BDRV_SECTOR_SIZE;
B
bellard 已提交
1091 1092
    }
    return drv->bdrv_getlength(bs);
B
bellard 已提交
1093 1094
}

B
bellard 已提交
1095
/* return 0 as number of sectors if no device present or error */
1096
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
B
bellard 已提交
1097
{
B
bellard 已提交
1098 1099 1100 1101 1102
    int64_t length;
    length = bdrv_getlength(bs);
    if (length < 0)
        length = 0;
    else
J
Jan Kiszka 已提交
1103
        length = length >> BDRV_SECTOR_BITS;
B
bellard 已提交
1104
    *nb_sectors_ptr = length;
B
bellard 已提交
1105
}
B
bellard 已提交
1106

1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
struct partition {
        uint8_t boot_ind;           /* 0x80 - active */
        uint8_t head;               /* starting head */
        uint8_t sector;             /* starting sector */
        uint8_t cyl;                /* starting cylinder */
        uint8_t sys_ind;            /* What partition type */
        uint8_t end_head;           /* end head */
        uint8_t end_sector;         /* end sector */
        uint8_t end_cyl;            /* end cylinder */
        uint32_t start_sect;        /* starting sector counting from 0 */
        uint32_t nr_sects;          /* nr of sectors in partition */
} __attribute__((packed));

/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
static int guess_disk_lchs(BlockDriverState *bs,
                           int *pcylinders, int *pheads, int *psectors)
{
1124
    uint8_t buf[BDRV_SECTOR_SIZE];
1125 1126 1127
    int ret, i, heads, sectors, cylinders;
    struct partition *p;
    uint32_t nr_sects;
B
blueswir1 已提交
1128
    uint64_t nb_sectors;
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167

    bdrv_get_geometry(bs, &nb_sectors);

    ret = bdrv_read(bs, 0, buf, 1);
    if (ret < 0)
        return -1;
    /* test msdos magic */
    if (buf[510] != 0x55 || buf[511] != 0xaa)
        return -1;
    for(i = 0; i < 4; i++) {
        p = ((struct partition *)(buf + 0x1be)) + i;
        nr_sects = le32_to_cpu(p->nr_sects);
        if (nr_sects && p->end_head) {
            /* We make the assumption that the partition terminates on
               a cylinder boundary */
            heads = p->end_head + 1;
            sectors = p->end_sector & 63;
            if (sectors == 0)
                continue;
            cylinders = nb_sectors / (heads * sectors);
            if (cylinders < 1 || cylinders > 16383)
                continue;
            *pheads = heads;
            *psectors = sectors;
            *pcylinders = cylinders;
#if 0
            printf("guessed geometry: LCHS=%d %d %d\n",
                   cylinders, heads, sectors);
#endif
            return 0;
        }
    }
    return -1;
}

void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
{
    int translation, lba_detected = 0;
    int cylinders, heads, secs;
B
blueswir1 已提交
1168
    uint64_t nb_sectors;
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222

    /* if a geometry hint is available, use it */
    bdrv_get_geometry(bs, &nb_sectors);
    bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
    translation = bdrv_get_translation_hint(bs);
    if (cylinders != 0) {
        *pcyls = cylinders;
        *pheads = heads;
        *psecs = secs;
    } else {
        if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
            if (heads > 16) {
                /* if heads > 16, it means that a BIOS LBA
                   translation was active, so the default
                   hardware geometry is OK */
                lba_detected = 1;
                goto default_geometry;
            } else {
                *pcyls = cylinders;
                *pheads = heads;
                *psecs = secs;
                /* disable any translation to be in sync with
                   the logical geometry */
                if (translation == BIOS_ATA_TRANSLATION_AUTO) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_NONE);
                }
            }
        } else {
        default_geometry:
            /* if no geometry, use a standard physical disk geometry */
            cylinders = nb_sectors / (16 * 63);

            if (cylinders > 16383)
                cylinders = 16383;
            else if (cylinders < 2)
                cylinders = 2;
            *pcyls = cylinders;
            *pheads = 16;
            *psecs = 63;
            if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
                if ((*pcyls * *pheads) <= 131072) {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LARGE);
                } else {
                    bdrv_set_translation_hint(bs,
                                              BIOS_ATA_TRANSLATION_LBA);
                }
            }
        }
        bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
    }
}

1223
void bdrv_set_geometry_hint(BlockDriverState *bs,
B
bellard 已提交
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
                            int cyls, int heads, int secs)
{
    bs->cyls = cyls;
    bs->heads = heads;
    bs->secs = secs;
}

void bdrv_set_type_hint(BlockDriverState *bs, int type)
{
    bs->type = type;
    bs->removable = ((type == BDRV_TYPE_CDROM ||
                      type == BDRV_TYPE_FLOPPY));
}

B
bellard 已提交
1238 1239 1240 1241 1242
void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
{
    bs->translation = translation;
}

1243
void bdrv_get_geometry_hint(BlockDriverState *bs,
B
bellard 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
                            int *pcyls, int *pheads, int *psecs)
{
    *pcyls = bs->cyls;
    *pheads = bs->heads;
    *psecs = bs->secs;
}

int bdrv_get_type_hint(BlockDriverState *bs)
{
    return bs->type;
}

B
bellard 已提交
1256 1257 1258 1259 1260
int bdrv_get_translation_hint(BlockDriverState *bs)
{
    return bs->translation;
}

1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                       BlockErrorAction on_write_error)
{
    bs->on_read_error = on_read_error;
    bs->on_write_error = on_write_error;
}

BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
{
    return is_read ? bs->on_read_error : bs->on_write_error;
}

B
bellard 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
int bdrv_is_removable(BlockDriverState *bs)
{
    return bs->removable;
}

int bdrv_is_read_only(BlockDriverState *bs)
{
    return bs->read_only;
}

1283 1284 1285 1286 1287
int bdrv_is_sg(BlockDriverState *bs)
{
    return bs->sg;
}

1288 1289 1290 1291 1292
int bdrv_enable_write_cache(BlockDriverState *bs)
{
    return bs->enable_write_cache;
}

B
bellard 已提交
1293
/* XXX: no longer used */
1294
void bdrv_set_change_cb(BlockDriverState *bs,
B
bellard 已提交
1295 1296 1297 1298 1299 1300
                        void (*change_cb)(void *opaque), void *opaque)
{
    bs->change_cb = change_cb;
    bs->change_opaque = opaque;
}

B
bellard 已提交
1301 1302 1303 1304 1305 1306 1307
int bdrv_is_encrypted(BlockDriverState *bs)
{
    if (bs->backing_hd && bs->backing_hd->encrypted)
        return 1;
    return bs->encrypted;
}

1308 1309 1310 1311 1312 1313 1314 1315 1316
int bdrv_key_required(BlockDriverState *bs)
{
    BlockDriverState *backing_hd = bs->backing_hd;

    if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
        return 1;
    return (bs->encrypted && !bs->valid_key);
}

B
bellard 已提交
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
int bdrv_set_key(BlockDriverState *bs, const char *key)
{
    int ret;
    if (bs->backing_hd && bs->backing_hd->encrypted) {
        ret = bdrv_set_key(bs->backing_hd, key);
        if (ret < 0)
            return ret;
        if (!bs->encrypted)
            return 0;
    }
1327 1328 1329 1330 1331
    if (!bs->encrypted) {
        return -EINVAL;
    } else if (!bs->drv || !bs->drv->bdrv_set_key) {
        return -ENOMEDIUM;
    }
1332
    ret = bs->drv->bdrv_set_key(bs, key);
1333 1334 1335 1336 1337 1338 1339 1340 1341
    if (ret < 0) {
        bs->valid_key = 0;
    } else if (!bs->valid_key) {
        bs->valid_key = 1;
        /* call the change callback now, we skipped it on open */
        bs->media_changed = 1;
        if (bs->change_cb)
            bs->change_cb(bs->change_opaque);
    }
1342
    return ret;
B
bellard 已提交
1343 1344 1345 1346
}

void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
{
B
bellard 已提交
1347
    if (!bs->drv) {
B
bellard 已提交
1348 1349 1350 1351 1352 1353
        buf[0] = '\0';
    } else {
        pstrcpy(buf, buf_size, bs->drv->format_name);
    }
}

1354
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
B
bellard 已提交
1355 1356 1357 1358
                         void *opaque)
{
    BlockDriver *drv;

1359
    QLIST_FOREACH(drv, &bdrv_drivers, list) {
B
bellard 已提交
1360 1361 1362 1363
        it(opaque, drv->format_name);
    }
}

B
bellard 已提交
1364 1365 1366 1367
BlockDriverState *bdrv_find(const char *name)
{
    BlockDriverState *bs;

1368 1369
    QTAILQ_FOREACH(bs, &bdrv_states, list) {
        if (!strcmp(name, bs->device_name)) {
B
bellard 已提交
1370
            return bs;
1371
        }
B
bellard 已提交
1372 1373 1374 1375
    }
    return NULL;
}

M
Markus Armbruster 已提交
1376 1377 1378 1379 1380 1381 1382 1383
BlockDriverState *bdrv_next(BlockDriverState *bs)
{
    if (!bs) {
        return QTAILQ_FIRST(&bdrv_states);
    }
    return QTAILQ_NEXT(bs, list);
}

1384
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
B
bellard 已提交
1385 1386 1387
{
    BlockDriverState *bs;

1388
    QTAILQ_FOREACH(bs, &bdrv_states, list) {
1389
        it(opaque, bs);
B
bellard 已提交
1390 1391 1392
    }
}

B
bellard 已提交
1393 1394 1395 1396 1397
const char *bdrv_get_device_name(BlockDriverState *bs)
{
    return bs->device_name;
}

P
pbrook 已提交
1398 1399
void bdrv_flush(BlockDriverState *bs)
{
1400 1401 1402 1403
    if (bs->open_flags & BDRV_O_NO_FLUSH) {
        return;
    }

1404
    if (bs->drv && bs->drv->bdrv_flush)
P
pbrook 已提交
1405 1406 1407
        bs->drv->bdrv_flush(bs);
}

A
aliguori 已提交
1408 1409 1410 1411
void bdrv_flush_all(void)
{
    BlockDriverState *bs;

1412 1413 1414
    QTAILQ_FOREACH(bs, &bdrv_states, list) {
        if (bs->drv && !bdrv_is_read_only(bs) &&
            (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
A
aliguori 已提交
1415
            bdrv_flush(bs);
1416 1417
        }
    }
A
aliguori 已提交
1418 1419
}

K
Kevin Wolf 已提交
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
int bdrv_has_zero_init(BlockDriverState *bs)
{
    assert(bs->drv);

    if (bs->drv->no_zero_init) {
        return 0;
    } else if (bs->file) {
        return bdrv_has_zero_init(bs->file);
    }

    return 1;
}

1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
/*
 * Returns true iff the specified sector is present in the disk image. Drivers
 * not implementing the functionality are assumed to not support backing files,
 * hence all their sectors are reported as allocated.
 *
 * 'pnum' is set to the number of sectors (including and immediately following
 * the specified sector) that are known to be in the same
 * allocated/unallocated state.
 *
 * 'nb_sectors' is the max value 'pnum' should be set to.
 */
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
	int *pnum)
{
    int64_t n;
    if (!bs->drv->bdrv_is_allocated) {
        if (sector_num >= bs->total_sectors) {
            *pnum = 0;
            return 0;
        }
        n = bs->total_sectors - sector_num;
        *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
        return 1;
    }
    return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
}

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488
void bdrv_mon_event(const BlockDriverState *bdrv,
                    BlockMonEventAction action, int is_read)
{
    QObject *data;
    const char *action_str;

    switch (action) {
    case BDRV_ACTION_REPORT:
        action_str = "report";
        break;
    case BDRV_ACTION_IGNORE:
        action_str = "ignore";
        break;
    case BDRV_ACTION_STOP:
        action_str = "stop";
        break;
    default:
        abort();
    }

    data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
                              bdrv->device_name,
                              action_str,
                              is_read ? "read" : "write");
    monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);

    qobject_decref(data);
}

1489
static void bdrv_print_dict(QObject *obj, void *opaque)
B
bellard 已提交
1490
{
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
    QDict *bs_dict;
    Monitor *mon = opaque;

    bs_dict = qobject_to_qdict(obj);

    monitor_printf(mon, "%s: type=%s removable=%d",
                        qdict_get_str(bs_dict, "device"),
                        qdict_get_str(bs_dict, "type"),
                        qdict_get_bool(bs_dict, "removable"));

    if (qdict_get_bool(bs_dict, "removable")) {
        monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
    }

    if (qdict_haskey(bs_dict, "inserted")) {
        QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));

        monitor_printf(mon, " file=");
        monitor_print_filename(mon, qdict_get_str(qdict, "file"));
        if (qdict_haskey(qdict, "backing_file")) {
            monitor_printf(mon, " backing_file=");
            monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
        }
        monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
                            qdict_get_bool(qdict, "ro"),
                            qdict_get_str(qdict, "drv"),
                            qdict_get_bool(qdict, "encrypted"));
    } else {
        monitor_printf(mon, " [not inserted]");
    }

    monitor_printf(mon, "\n");
}

void bdrv_info_print(Monitor *mon, const QObject *data)
{
    qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
}

void bdrv_info(Monitor *mon, QObject **ret_data)
{
    QList *bs_list;
B
bellard 已提交
1533 1534
    BlockDriverState *bs;

1535 1536
    bs_list = qlist_new();

1537
    QTAILQ_FOREACH(bs, &bdrv_states, list) {
1538 1539 1540
        QObject *bs_obj;
        const char *type = "unknown";

B
bellard 已提交
1541 1542
        switch(bs->type) {
        case BDRV_TYPE_HD:
1543
            type = "hd";
B
bellard 已提交
1544 1545
            break;
        case BDRV_TYPE_CDROM:
1546
            type = "cdrom";
B
bellard 已提交
1547 1548
            break;
        case BDRV_TYPE_FLOPPY:
1549
            type = "floppy";
B
bellard 已提交
1550 1551
            break;
        }
1552 1553 1554 1555 1556 1557

        bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
                                    "'removable': %i, 'locked': %i }",
                                    bs->device_name, type, bs->removable,
                                    bs->locked);

B
bellard 已提交
1558
        if (bs->drv) {
1559 1560 1561 1562 1563 1564 1565 1566
            QObject *obj;
            QDict *bs_dict = qobject_to_qdict(bs_obj);

            obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
                                     "'encrypted': %i }",
                                     bs->filename, bs->read_only,
                                     bs->drv->format_name,
                                     bdrv_is_encrypted(bs));
1567
            if (bs->backing_file[0] != '\0') {
1568 1569 1570
                QDict *qdict = qobject_to_qdict(obj);
                qdict_put(qdict, "backing_file",
                          qstring_from_str(bs->backing_file));
A
aliguori 已提交
1571
            }
1572 1573

            qdict_put_obj(bs_dict, "inserted", obj);
B
bellard 已提交
1574
        }
1575
        qlist_append_obj(bs_list, bs_obj);
B
bellard 已提交
1576
    }
1577 1578

    *ret_data = QOBJECT(bs_list);
B
bellard 已提交
1579
}
1580

1581
static void bdrv_stats_iter(QObject *data, void *opaque)
1582
{
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
    QDict *qdict;
    Monitor *mon = opaque;

    qdict = qobject_to_qdict(data);
    monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));

    qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
    monitor_printf(mon, " rd_bytes=%" PRId64
                        " wr_bytes=%" PRId64
                        " rd_operations=%" PRId64
                        " wr_operations=%" PRId64
                        "\n",
                        qdict_get_int(qdict, "rd_bytes"),
                        qdict_get_int(qdict, "wr_bytes"),
                        qdict_get_int(qdict, "rd_operations"),
                        qdict_get_int(qdict, "wr_operations"));
}

void bdrv_stats_print(Monitor *mon, const QObject *data)
{
    qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
}

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
{
    QObject *res;
    QDict *dict;

    res = qobject_from_jsonf("{ 'stats': {"
                             "'rd_bytes': %" PRId64 ","
                             "'wr_bytes': %" PRId64 ","
                             "'rd_operations': %" PRId64 ","
                             "'wr_operations': %" PRId64 ","
                             "'wr_highest_offset': %" PRId64
                             "} }",
                             bs->rd_bytes, bs->wr_bytes,
                             bs->rd_ops, bs->wr_ops,
1620 1621
                             bs->wr_highest_sector *
                             (uint64_t)BDRV_SECTOR_SIZE);
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
    dict  = qobject_to_qdict(res);

    if (*bs->device_name) {
        qdict_put(dict, "device", qstring_from_str(bs->device_name));
    }

    if (bs->file) {
        QObject *parent = bdrv_info_stats_bs(bs->file);
        qdict_put_obj(dict, "parent", parent);
    }

    return res;
}

1636 1637 1638 1639
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
{
    QObject *obj;
    QList *devices;
1640 1641
    BlockDriverState *bs;

1642 1643
    devices = qlist_new();

1644
    QTAILQ_FOREACH(bs, &bdrv_states, list) {
1645
        obj = bdrv_info_stats_bs(bs);
1646
        qlist_append_obj(devices, obj);
1647
    }
1648 1649

    *ret_data = QOBJECT(devices);
1650
}
B
bellard 已提交
1651

1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
{
    if (bs->backing_hd && bs->backing_hd->encrypted)
        return bs->backing_file;
    else if (bs->encrypted)
        return bs->filename;
    else
        return NULL;
}

1662
void bdrv_get_backing_filename(BlockDriverState *bs,
B
bellard 已提交
1663 1664
                               char *filename, int filename_size)
{
K
Kevin Wolf 已提交
1665
    if (!bs->backing_file) {
B
bellard 已提交
1666 1667 1668 1669 1670 1671
        pstrcpy(filename, filename_size, "");
    } else {
        pstrcpy(filename, filename_size, bs->backing_file);
    }
}

1672
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
B
bellard 已提交
1673 1674 1675 1676
                          const uint8_t *buf, int nb_sectors)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1677
        return -ENOMEDIUM;
B
bellard 已提交
1678 1679
    if (!drv->bdrv_write_compressed)
        return -ENOTSUP;
K
Kevin Wolf 已提交
1680 1681
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return -EIO;
1682

1683
    if (bs->dirty_bitmap) {
1684 1685
        set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
    }
1686

B
bellard 已提交
1687 1688
    return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
1689

B
bellard 已提交
1690 1691 1692 1693
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1694
        return -ENOMEDIUM;
B
bellard 已提交
1695 1696 1697 1698 1699 1700
    if (!drv->bdrv_get_info)
        return -ENOTSUP;
    memset(bdi, 0, sizeof(*bdi));
    return drv->bdrv_get_info(bs, bdi);
}

1701 1702
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
                      int64_t pos, int size)
1703 1704 1705 1706
{
    BlockDriver *drv = bs->drv;
    if (!drv)
        return -ENOMEDIUM;
1707 1708 1709 1710 1711
    if (drv->bdrv_save_vmstate)
        return drv->bdrv_save_vmstate(bs, buf, pos, size);
    if (bs->file)
        return bdrv_save_vmstate(bs->file, buf, pos, size);
    return -ENOTSUP;
1712 1713
}

1714 1715
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
                      int64_t pos, int size)
1716 1717 1718 1719
{
    BlockDriver *drv = bs->drv;
    if (!drv)
        return -ENOMEDIUM;
1720 1721 1722 1723 1724
    if (drv->bdrv_load_vmstate)
        return drv->bdrv_load_vmstate(bs, buf, pos, size);
    if (bs->file)
        return bdrv_load_vmstate(bs->file, buf, pos, size);
    return -ENOTSUP;
1725 1726
}

K
Kevin Wolf 已提交
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
{
    BlockDriver *drv = bs->drv;

    if (!drv || !drv->bdrv_debug_event) {
        return;
    }

    return drv->bdrv_debug_event(bs, event);

}

B
bellard 已提交
1739 1740 1741
/**************************************************************/
/* handling of snapshots */

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
int bdrv_can_snapshot(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
        return 0;
    }

    if (!drv->bdrv_snapshot_create) {
        if (bs->file != NULL) {
            return bdrv_can_snapshot(bs->file);
        }
        return 0;
    }

    return 1;
}

1759
int bdrv_snapshot_create(BlockDriverState *bs,
B
bellard 已提交
1760 1761 1762 1763
                         QEMUSnapshotInfo *sn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1764
        return -ENOMEDIUM;
1765 1766 1767 1768 1769
    if (drv->bdrv_snapshot_create)
        return drv->bdrv_snapshot_create(bs, sn_info);
    if (bs->file)
        return bdrv_snapshot_create(bs->file, sn_info);
    return -ENOTSUP;
B
bellard 已提交
1770 1771
}

1772
int bdrv_snapshot_goto(BlockDriverState *bs,
B
bellard 已提交
1773 1774 1775
                       const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
1776 1777
    int ret, open_ret;

B
bellard 已提交
1778
    if (!drv)
B
bellard 已提交
1779
        return -ENOMEDIUM;
1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
    if (drv->bdrv_snapshot_goto)
        return drv->bdrv_snapshot_goto(bs, snapshot_id);

    if (bs->file) {
        drv->bdrv_close(bs);
        ret = bdrv_snapshot_goto(bs->file, snapshot_id);
        open_ret = drv->bdrv_open(bs, bs->open_flags);
        if (open_ret < 0) {
            bdrv_delete(bs->file);
            bs->drv = NULL;
            return open_ret;
        }
        return ret;
    }

    return -ENOTSUP;
B
bellard 已提交
1796 1797 1798 1799 1800 1801
}

int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1802
        return -ENOMEDIUM;
1803 1804 1805 1806 1807
    if (drv->bdrv_snapshot_delete)
        return drv->bdrv_snapshot_delete(bs, snapshot_id);
    if (bs->file)
        return bdrv_snapshot_delete(bs->file, snapshot_id);
    return -ENOTSUP;
B
bellard 已提交
1808 1809
}

1810
int bdrv_snapshot_list(BlockDriverState *bs,
B
bellard 已提交
1811 1812 1813 1814
                       QEMUSnapshotInfo **psn_info)
{
    BlockDriver *drv = bs->drv;
    if (!drv)
B
bellard 已提交
1815
        return -ENOMEDIUM;
1816 1817 1818 1819 1820
    if (drv->bdrv_snapshot_list)
        return drv->bdrv_snapshot_list(bs, psn_info);
    if (bs->file)
        return bdrv_snapshot_list(bs->file, psn_info);
    return -ENOTSUP;
B
bellard 已提交
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
}

#define NB_SUFFIXES 4

char *get_human_readable_size(char *buf, int buf_size, int64_t size)
{
    static const char suffixes[NB_SUFFIXES] = "KMGT";
    int64_t base;
    int i;

    if (size <= 999) {
        snprintf(buf, buf_size, "%" PRId64, size);
    } else {
        base = 1024;
        for(i = 0; i < NB_SUFFIXES; i++) {
            if (size < (10 * base)) {
1837
                snprintf(buf, buf_size, "%0.1f%c",
B
bellard 已提交
1838 1839 1840 1841
                         (double)size / base,
                         suffixes[i]);
                break;
            } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1842
                snprintf(buf, buf_size, "%" PRId64 "%c",
B
bellard 已提交
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855
                         ((size + (base >> 1)) / base),
                         suffixes[i]);
                break;
            }
            base = base * 1024;
        }
    }
    return buf;
}

char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
{
    char buf1[128], date_buf[128], clock_buf[128];
1856 1857 1858
#ifdef _WIN32
    struct tm *ptm;
#else
B
bellard 已提交
1859
    struct tm tm;
1860
#endif
B
bellard 已提交
1861 1862 1863 1864
    time_t ti;
    int64_t secs;

    if (!sn) {
1865 1866
        snprintf(buf, buf_size,
                 "%-10s%-20s%7s%20s%15s",
B
bellard 已提交
1867 1868 1869
                 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
    } else {
        ti = sn->date_sec;
1870 1871 1872 1873 1874
#ifdef _WIN32
        ptm = localtime(&ti);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", ptm);
#else
B
bellard 已提交
1875 1876 1877
        localtime_r(&ti, &tm);
        strftime(date_buf, sizeof(date_buf),
                 "%Y-%m-%d %H:%M:%S", &tm);
1878
#endif
B
bellard 已提交
1879 1880 1881 1882 1883
        secs = sn->vm_clock_nsec / 1000000000;
        snprintf(clock_buf, sizeof(clock_buf),
                 "%02d:%02d:%02d.%03d",
                 (int)(secs / 3600),
                 (int)((secs / 60) % 60),
1884
                 (int)(secs % 60),
B
bellard 已提交
1885 1886
                 (int)((sn->vm_clock_nsec / 1000000) % 1000));
        snprintf(buf, buf_size,
1887
                 "%-10s%-20s%7s%20s%15s",
B
bellard 已提交
1888 1889 1890 1891 1892 1893 1894 1895
                 sn->id_str, sn->name,
                 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                 date_buf,
                 clock_buf);
    }
    return buf;
}

B
bellard 已提交
1896

B
bellard 已提交
1897
/**************************************************************/
B
bellard 已提交
1898
/* async I/Os */
B
bellard 已提交
1899

1900
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1901
                                 QEMUIOVector *qiov, int nb_sectors,
1902
                                 BlockDriverCompletionFunc *cb, void *opaque)
B
bellard 已提交
1903 1904
{
    BlockDriver *drv = bs->drv;
1905
    BlockDriverAIOCB *ret;
B
bellard 已提交
1906

B
bellard 已提交
1907
    if (!drv)
1908
        return NULL;
1909 1910
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return NULL;
1911

1912 1913
    ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
                              cb, opaque);
1914 1915 1916

    if (ret) {
	/* Update stats even though technically transfer has not happened. */
J
Jan Kiszka 已提交
1917
	bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1918 1919 1920 1921
	bs->rd_ops ++;
    }

    return ret;
B
bellard 已提交
1922 1923
}

1924 1925 1926
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
                                  QEMUIOVector *qiov, int nb_sectors,
                                  BlockDriverCompletionFunc *cb, void *opaque)
B
bellard 已提交
1927
{
B
bellard 已提交
1928
    BlockDriver *drv = bs->drv;
1929
    BlockDriverAIOCB *ret;
B
bellard 已提交
1930

B
bellard 已提交
1931
    if (!drv)
1932
        return NULL;
B
bellard 已提交
1933
    if (bs->read_only)
1934
        return NULL;
1935 1936
    if (bdrv_check_request(bs, sector_num, nb_sectors))
        return NULL;
B
bellard 已提交
1937

1938
    if (bs->dirty_bitmap) {
1939 1940
        set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
    }
1941

1942 1943
    ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
                               cb, opaque);
1944 1945

    if (ret) {
1946 1947 1948 1949 1950 1951
        /* Update stats even though technically transfer has not happened. */
        bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
        bs->wr_ops ++;
        if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
            bs->wr_highest_sector = sector_num + nb_sectors - 1;
        }
1952 1953 1954
    }

    return ret;
B
bellard 已提交
1955 1956
}

K
Kevin Wolf 已提交
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975

typedef struct MultiwriteCB {
    int error;
    int num_requests;
    int num_callbacks;
    struct {
        BlockDriverCompletionFunc *cb;
        void *opaque;
        QEMUIOVector *free_qiov;
        void *free_buf;
    } callbacks[];
} MultiwriteCB;

static void multiwrite_user_cb(MultiwriteCB *mcb)
{
    int i;

    for (i = 0; i < mcb->num_callbacks; i++) {
        mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1976 1977 1978
        if (mcb->callbacks[i].free_qiov) {
            qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
        }
K
Kevin Wolf 已提交
1979
        qemu_free(mcb->callbacks[i].free_qiov);
1980
        qemu_vfree(mcb->callbacks[i].free_buf);
K
Kevin Wolf 已提交
1981 1982 1983 1984 1985 1986 1987
    }
}

static void multiwrite_cb(void *opaque, int ret)
{
    MultiwriteCB *mcb = opaque;

1988
    if (ret < 0 && !mcb->error) {
K
Kevin Wolf 已提交
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
        mcb->error = ret;
        multiwrite_user_cb(mcb);
    }

    mcb->num_requests--;
    if (mcb->num_requests == 0) {
        if (mcb->error == 0) {
            multiwrite_user_cb(mcb);
        }
        qemu_free(mcb);
    }
}

static int multiwrite_req_compare(const void *a, const void *b)
{
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
    const BlockRequest *req1 = a, *req2 = b;

    /*
     * Note that we can't simply subtract req2->sector from req1->sector
     * here as that could overflow the return value.
     */
    if (req1->sector > req2->sector) {
        return 1;
    } else if (req1->sector < req2->sector) {
        return -1;
    } else {
        return 0;
    }
K
Kevin Wolf 已提交
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
}

/*
 * Takes a bunch of requests and tries to merge them. Returns the number of
 * requests that remain after merging.
 */
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
    int num_reqs, MultiwriteCB *mcb)
{
    int i, outidx;

    // Sort requests by start sector
    qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);

    // Check if adjacent requests touch the same clusters. If so, combine them,
    // filling up gaps with zero sectors.
    outidx = 0;
    for (i = 1; i < num_reqs; i++) {
        int merge = 0;
        int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;

        // This handles the cases that are valid for all block drivers, namely
        // exactly sequential writes and overlapping writes.
        if (reqs[i].sector <= oldreq_last) {
            merge = 1;
        }

        // The block driver may decide that it makes sense to combine requests
        // even if there is a gap of some sectors between them. In this case,
        // the gap is filled with zeros (therefore only applicable for yet
        // unused space in format like qcow2).
        if (!merge && bs->drv->bdrv_merge_requests) {
            merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
        }

2052 2053 2054 2055
        if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
            merge = 0;
        }

K
Kevin Wolf 已提交
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078
        if (merge) {
            size_t size;
            QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
            qemu_iovec_init(qiov,
                reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);

            // Add the first request to the merged one. If the requests are
            // overlapping, drop the last sectors of the first request.
            size = (reqs[i].sector - reqs[outidx].sector) << 9;
            qemu_iovec_concat(qiov, reqs[outidx].qiov, size);

            // We might need to add some zeros between the two requests
            if (reqs[i].sector > oldreq_last) {
                size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
                uint8_t *buf = qemu_blockalign(bs, zero_bytes);
                memset(buf, 0, zero_bytes);
                qemu_iovec_add(qiov, buf, zero_bytes);
                mcb->callbacks[i].free_buf = buf;
            }

            // Add the second request
            qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);

2079
            reqs[outidx].nb_sectors = qiov->size >> 9;
K
Kevin Wolf 已提交
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140
            reqs[outidx].qiov = qiov;

            mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
        } else {
            outidx++;
            reqs[outidx].sector     = reqs[i].sector;
            reqs[outidx].nb_sectors = reqs[i].nb_sectors;
            reqs[outidx].qiov       = reqs[i].qiov;
        }
    }

    return outidx + 1;
}

/*
 * Submit multiple AIO write requests at once.
 *
 * On success, the function returns 0 and all requests in the reqs array have
 * been submitted. In error case this function returns -1, and any of the
 * requests may or may not be submitted yet. In particular, this means that the
 * callback will be called for some of the requests, for others it won't. The
 * caller must check the error field of the BlockRequest to wait for the right
 * callbacks (if error != 0, no callback will be called).
 *
 * The implementation may modify the contents of the reqs array, e.g. to merge
 * requests. However, the fields opaque and error are left unmodified as they
 * are used to signal failure for a single request to the caller.
 */
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
{
    BlockDriverAIOCB *acb;
    MultiwriteCB *mcb;
    int i;

    if (num_reqs == 0) {
        return 0;
    }

    // Create MultiwriteCB structure
    mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
    mcb->num_requests = 0;
    mcb->num_callbacks = num_reqs;

    for (i = 0; i < num_reqs; i++) {
        mcb->callbacks[i].cb = reqs[i].cb;
        mcb->callbacks[i].opaque = reqs[i].opaque;
    }

    // Check for mergable requests
    num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);

    // Run the aio requests
    for (i = 0; i < num_reqs; i++) {
        acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
            reqs[i].nb_sectors, multiwrite_cb, mcb);

        if (acb == NULL) {
            // We can only fail the whole thing if no request has been
            // submitted yet. Otherwise we'll wait for the submitted AIOs to
            // complete and report the error in the callback.
            if (mcb->num_requests == 0) {
2141
                reqs[i].error = -EIO;
K
Kevin Wolf 已提交
2142 2143
                goto fail;
            } else {
2144 2145
                mcb->num_requests++;
                multiwrite_cb(mcb, -EIO);
K
Kevin Wolf 已提交
2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
                break;
            }
        } else {
            mcb->num_requests++;
        }
    }

    return 0;

fail:
B
Bruce Rogers 已提交
2156
    qemu_free(mcb);
K
Kevin Wolf 已提交
2157 2158 2159
    return -1;
}

2160 2161 2162 2163 2164
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    BlockDriver *drv = bs->drv;

2165 2166 2167 2168
    if (bs->open_flags & BDRV_O_NO_FLUSH) {
        return bdrv_aio_noop_em(bs, cb, opaque);
    }

2169 2170 2171 2172 2173
    if (!drv)
        return NULL;
    return drv->bdrv_aio_flush(bs, cb, opaque);
}

B
bellard 已提交
2174 2175
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
2176
    acb->pool->cancel(acb);
B
bellard 已提交
2177 2178
}

2179

B
bellard 已提交
2180 2181 2182
/**************************************************************/
/* async block device emulation */

2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194
typedef struct BlockDriverAIOCBSync {
    BlockDriverAIOCB common;
    QEMUBH *bh;
    int ret;
    /* vector translation state */
    QEMUIOVector *qiov;
    uint8_t *bounce;
    int is_write;
} BlockDriverAIOCBSync;

static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
{
2195 2196
    BlockDriverAIOCBSync *acb =
        container_of(blockacb, BlockDriverAIOCBSync, common);
2197
    qemu_bh_delete(acb->bh);
A
Avi Kivity 已提交
2198
    acb->bh = NULL;
2199 2200 2201 2202 2203 2204 2205 2206
    qemu_aio_release(acb);
}

static AIOPool bdrv_em_aio_pool = {
    .aiocb_size         = sizeof(BlockDriverAIOCBSync),
    .cancel             = bdrv_aio_cancel_em,
};

2207
static void bdrv_aio_bh_cb(void *opaque)
B
bellard 已提交
2208
{
2209
    BlockDriverAIOCBSync *acb = opaque;
2210 2211 2212

    if (!acb->is_write)
        qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2213
    qemu_vfree(acb->bounce);
2214
    acb->common.cb(acb->common.opaque, acb->ret);
2215
    qemu_bh_delete(acb->bh);
A
Avi Kivity 已提交
2216
    acb->bh = NULL;
2217
    qemu_aio_release(acb);
B
bellard 已提交
2218
}
2219

2220 2221 2222 2223 2224 2225 2226 2227
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
                                            int64_t sector_num,
                                            QEMUIOVector *qiov,
                                            int nb_sectors,
                                            BlockDriverCompletionFunc *cb,
                                            void *opaque,
                                            int is_write)

B
bellard 已提交
2228
{
2229 2230
    BlockDriverAIOCBSync *acb;

2231
    acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2232 2233
    acb->is_write = is_write;
    acb->qiov = qiov;
2234
    acb->bounce = qemu_blockalign(bs, qiov->size);
2235

2236 2237
    if (!acb->bh)
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2238 2239 2240 2241 2242 2243 2244 2245

    if (is_write) {
        qemu_iovec_to_buffer(acb->qiov, acb->bounce);
        acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
    } else {
        acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
    }

2246
    qemu_bh_schedule(acb->bh);
2247

2248
    return &acb->common;
2249 2250
}

2251 2252
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2253
        BlockDriverCompletionFunc *cb, void *opaque)
2254
{
2255 2256
    return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
}
B
bellard 已提交
2257

2258 2259 2260 2261 2262
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
2263 2264
}

2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    BlockDriverAIOCBSync *acb;

    acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
    acb->is_write = 1; /* don't bounce in the completion hadler */
    acb->qiov = NULL;
    acb->bounce = NULL;
    acb->ret = 0;

    if (!acb->bh)
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);

    bdrv_flush(bs);
    qemu_bh_schedule(acb->bh);
    return &acb->common;
}

2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    BlockDriverAIOCBSync *acb;

    acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
    acb->is_write = 1; /* don't bounce in the completion handler */
    acb->qiov = NULL;
    acb->bounce = NULL;
    acb->ret = 0;

    if (!acb->bh) {
        acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
    }

    qemu_bh_schedule(acb->bh);
    return &acb->common;
}

B
bellard 已提交
2303 2304
/**************************************************************/
/* sync block device emulation */
B
bellard 已提交
2305

B
bellard 已提交
2306 2307 2308
static void bdrv_rw_em_cb(void *opaque, int ret)
{
    *(int *)opaque = ret;
B
bellard 已提交
2309 2310
}

B
bellard 已提交
2311 2312
#define NOT_DONE 0x7fffffff

2313
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
B
bellard 已提交
2314
                        uint8_t *buf, int nb_sectors)
P
pbrook 已提交
2315
{
2316 2317
    int async_ret;
    BlockDriverAIOCB *acb;
2318 2319
    struct iovec iov;
    QEMUIOVector qiov;
B
bellard 已提交
2320

2321 2322
    async_context_push();

B
bellard 已提交
2323
    async_ret = NOT_DONE;
2324
    iov.iov_base = (void *)buf;
2325
    iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2326 2327 2328
    qemu_iovec_init_external(&qiov, &iov, 1);
    acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
        bdrv_rw_em_cb, &async_ret);
2329 2330 2331 2332
    if (acb == NULL) {
        async_ret = -1;
        goto fail;
    }
2333

B
bellard 已提交
2334 2335 2336
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
2337

2338 2339 2340

fail:
    async_context_pop();
B
bellard 已提交
2341
    return async_ret;
P
pbrook 已提交
2342 2343
}

B
bellard 已提交
2344 2345 2346
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                         const uint8_t *buf, int nb_sectors)
{
2347 2348
    int async_ret;
    BlockDriverAIOCB *acb;
2349 2350
    struct iovec iov;
    QEMUIOVector qiov;
B
bellard 已提交
2351

2352 2353
    async_context_push();

B
bellard 已提交
2354
    async_ret = NOT_DONE;
2355
    iov.iov_base = (void *)buf;
2356
    iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2357 2358 2359
    qemu_iovec_init_external(&qiov, &iov, 1);
    acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
        bdrv_rw_em_cb, &async_ret);
2360 2361 2362 2363
    if (acb == NULL) {
        async_ret = -1;
        goto fail;
    }
B
bellard 已提交
2364 2365 2366
    while (async_ret == NOT_DONE) {
        qemu_aio_wait();
    }
2367 2368 2369

fail:
    async_context_pop();
B
bellard 已提交
2370 2371
    return async_ret;
}
B
bellard 已提交
2372 2373 2374

void bdrv_init(void)
{
2375
    module_call_init(MODULE_INIT_BLOCK);
B
bellard 已提交
2376
}
2377

2378 2379 2380 2381 2382 2383
void bdrv_init_with_whitelist(void)
{
    use_bdrv_whitelist = 1;
    bdrv_init();
}

2384 2385
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   BlockDriverCompletionFunc *cb, void *opaque)
2386 2387 2388
{
    BlockDriverAIOCB *acb;

2389 2390 2391
    if (pool->free_aiocb) {
        acb = pool->free_aiocb;
        pool->free_aiocb = acb->next;
2392
    } else {
2393 2394
        acb = qemu_mallocz(pool->aiocb_size);
        acb->pool = pool;
2395 2396 2397 2398 2399 2400 2401 2402 2403
    }
    acb->bs = bs;
    acb->cb = cb;
    acb->opaque = opaque;
    return acb;
}

void qemu_aio_release(void *p)
{
2404 2405 2406 2407
    BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
    AIOPool *pool = acb->pool;
    acb->next = pool->free_aiocb;
    pool->free_aiocb = acb;
2408
}
B
bellard 已提交
2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429

/**************************************************************/
/* removable device support */

/**
 * Return TRUE if the media is present
 */
int bdrv_is_inserted(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;
    if (!drv)
        return 0;
    if (!drv->bdrv_is_inserted)
        return 1;
    ret = drv->bdrv_is_inserted(bs);
    return ret;
}

/**
 * Return TRUE if the media changed since the last call to this
2430
 * function. It is currently only used for floppy disks
B
bellard 已提交
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449
 */
int bdrv_media_changed(BlockDriverState *bs)
{
    BlockDriver *drv = bs->drv;
    int ret;

    if (!drv || !drv->bdrv_media_changed)
        ret = -ENOTSUP;
    else
        ret = drv->bdrv_media_changed(bs);
    if (ret == -ENOTSUP)
        ret = bs->media_changed;
    bs->media_changed = 0;
    return ret;
}

/**
 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
 */
2450
int bdrv_eject(BlockDriverState *bs, int eject_flag)
B
bellard 已提交
2451 2452 2453 2454
{
    BlockDriver *drv = bs->drv;
    int ret;

2455 2456 2457 2458
    if (bs->locked) {
        return -EBUSY;
    }

B
bellard 已提交
2459 2460 2461 2462 2463 2464 2465 2466
    if (!drv || !drv->bdrv_eject) {
        ret = -ENOTSUP;
    } else {
        ret = drv->bdrv_eject(bs, eject_flag);
    }
    if (ret == -ENOTSUP) {
        if (eject_flag)
            bdrv_close(bs);
2467
        ret = 0;
B
bellard 已提交
2468
    }
2469 2470

    return ret;
B
bellard 已提交
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490
}

int bdrv_is_locked(BlockDriverState *bs)
{
    return bs->locked;
}

/**
 * Lock or unlock the media (if it is locked, the user won't be able
 * to eject it manually).
 */
void bdrv_set_locked(BlockDriverState *bs, int locked)
{
    BlockDriver *drv = bs->drv;

    bs->locked = locked;
    if (drv && drv->bdrv_set_locked) {
        drv->bdrv_set_locked(bs, locked);
    }
}
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501

/* needed for generic scsi interface */

int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
    BlockDriver *drv = bs->drv;

    if (drv && drv->bdrv_ioctl)
        return drv->bdrv_ioctl(bs, req, buf);
    return -ENOTSUP;
}
2502

2503 2504 2505
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque)
2506
{
2507
    BlockDriver *drv = bs->drv;
2508

2509 2510 2511
    if (drv && drv->bdrv_aio_ioctl)
        return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
    return NULL;
2512
}
2513

2514 2515


2516 2517 2518 2519
void *qemu_blockalign(BlockDriverState *bs, size_t size)
{
    return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
}
2520 2521 2522 2523

void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
{
    int64_t bitmap_size;
2524

2525
    bs->dirty_count = 0;
2526
    if (enable) {
2527 2528 2529 2530
        if (!bs->dirty_bitmap) {
            bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
                    BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
            bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2531

2532
            bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2533
        }
2534
    } else {
2535
        if (bs->dirty_bitmap) {
2536
            qemu_free(bs->dirty_bitmap);
2537
            bs->dirty_bitmap = NULL;
2538
        }
2539 2540 2541 2542 2543
    }
}

int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
{
J
Jan Kiszka 已提交
2544
    int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2545

2546 2547 2548 2549
    if (bs->dirty_bitmap &&
        (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
        return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
            (1 << (chunk % (sizeof(unsigned long) * 8)));
2550 2551 2552 2553 2554
    } else {
        return 0;
    }
}

2555 2556
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                      int nr_sectors)
2557 2558 2559
{
    set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
}
2560 2561 2562 2563 2564

int64_t bdrv_get_dirty_count(BlockDriverState *bs)
{
    return bs->dirty_count;
}