blockdev.c 95.6 KB
Newer Older
1 2 3 4 5 6 7
/*
 * QEMU host block devices
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * later.  See the COPYING file in the top-level directory.
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * 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.
31 32
 */

M
Markus Armbruster 已提交
33
#include "sysemu/block-backend.h"
34
#include "sysemu/blockdev.h"
P
Paolo Bonzini 已提交
35
#include "hw/block/block.h"
36
#include "block/blockjob.h"
37
#include "block/throttle-groups.h"
38
#include "monitor/monitor.h"
39
#include "qemu/error-report.h"
40 41
#include "qemu/option.h"
#include "qemu/config-file.h"
42
#include "qapi/qmp/types.h"
K
Kevin Wolf 已提交
43
#include "qapi-visit.h"
44
#include "qapi/qmp/qerror.h"
K
Kevin Wolf 已提交
45
#include "qapi/qmp-output-visitor.h"
46
#include "qapi/util.h"
47
#include "sysemu/sysemu.h"
48
#include "block/block_int.h"
L
Luiz Capitulino 已提交
49
#include "qmp-commands.h"
S
Stefan Hajnoczi 已提交
50
#include "trace.h"
51
#include "sysemu/arch_init.h"
52

53 54 55 56 57 58 59 60 61 62 63 64
static const char *const if_name[IF_COUNT] = {
    [IF_NONE] = "none",
    [IF_IDE] = "ide",
    [IF_SCSI] = "scsi",
    [IF_FLOPPY] = "floppy",
    [IF_PFLASH] = "pflash",
    [IF_MTD] = "mtd",
    [IF_SD] = "sd",
    [IF_VIRTIO] = "virtio",
    [IF_XEN] = "xen",
};

65
static int if_max_devs[IF_COUNT] = {
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
    /*
     * Do not change these numbers!  They govern how drive option
     * index maps to unit and bus.  That mapping is ABI.
     *
     * All controllers used to imlement if=T drives need to support
     * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
     * Otherwise, some index values map to "impossible" bus, unit
     * values.
     *
     * For instance, if you change [IF_SCSI] to 255, -drive
     * if=scsi,index=12 no longer means bus=1,unit=5, but
     * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
     * the drive can't be set up.  Regression.
     */
    [IF_IDE] = 2,
    [IF_SCSI] = 7,
82 83
};

84 85 86 87 88 89
/**
 * Boards may call this to offer board-by-board overrides
 * of the default, global values.
 */
void override_max_devs(BlockInterfaceType type, int max_devs)
{
90
    BlockBackend *blk;
91 92 93 94 95 96
    DriveInfo *dinfo;

    if (max_devs <= 0) {
        return;
    }

97 98
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
99 100 101 102 103 104 105 106 107 108 109
        if (dinfo->type == type) {
            fprintf(stderr, "Cannot override units-per-bus property of"
                    " the %s interface, because a drive of that type has"
                    " already been added.\n", if_name[type]);
            g_assert_not_reached();
        }
    }

    if_max_devs[type] = max_devs;
}

110 111 112 113 114 115 116
/*
 * We automatically delete the drive when a device using it gets
 * unplugged.  Questionable feature, but we can't just drop it.
 * Device models call blockdev_mark_auto_del() to schedule the
 * automatic deletion, and generic qdev code calls blockdev_auto_del()
 * when deletion is actually safe.
 */
117
void blockdev_mark_auto_del(BlockBackend *blk)
118
{
119
    DriveInfo *dinfo = blk_legacy_dinfo(blk);
120
    BlockDriverState *bs = blk_bs(blk);
121
    AioContext *aio_context;
122

123
    if (!dinfo) {
124 125 126
        return;
    }

M
Max Reitz 已提交
127 128 129
    if (bs) {
        aio_context = bdrv_get_aio_context(bs);
        aio_context_acquire(aio_context);
130

M
Max Reitz 已提交
131 132 133
        if (bs->job) {
            block_job_cancel(bs->job);
        }
134

M
Max Reitz 已提交
135 136
        aio_context_release(aio_context);
    }
137

138
    dinfo->auto_del = 1;
139 140
}

141
void blockdev_auto_del(BlockBackend *blk)
142
{
143
    DriveInfo *dinfo = blk_legacy_dinfo(blk);
144

145
    if (dinfo && dinfo->auto_del) {
146
        blk_unref(blk);
147 148 149
    }
}

150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
/**
 * Returns the current mapping of how many units per bus
 * a particular interface can support.
 *
 *  A positive integer indicates n units per bus.
 *  0 implies the mapping has not been established.
 * -1 indicates an invalid BlockInterfaceType was given.
 */
int drive_get_max_devs(BlockInterfaceType type)
{
    if (type >= IF_IDE && type < IF_COUNT) {
        return if_max_devs[type];
    }

    return -1;
}

167 168 169 170 171 172 173 174 175 176 177 178
static int drive_index_to_bus_id(BlockInterfaceType type, int index)
{
    int max_devs = if_max_devs[type];
    return max_devs ? index / max_devs : 0;
}

static int drive_index_to_unit_id(BlockInterfaceType type, int index)
{
    int max_devs = if_max_devs[type];
    return max_devs ? index % max_devs : index;
}

179 180
QemuOpts *drive_def(const char *optstr)
{
181
    return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
182 183 184
}

QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
185
                    const char *optstr)
186 187 188
{
    QemuOpts *opts;

189
    opts = drive_def(optstr);
190 191 192
    if (!opts) {
        return NULL;
    }
193
    if (type != IF_DEFAULT) {
194
        qemu_opt_set(opts, "if", if_name[type], &error_abort);
195 196
    }
    if (index >= 0) {
197
        qemu_opt_set_number(opts, "index", index, &error_abort);
198
    }
199
    if (file)
200
        qemu_opt_set(opts, "file", file, &error_abort);
201 202 203 204 205
    return opts;
}

DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
206
    BlockBackend *blk;
207 208
    DriveInfo *dinfo;

209 210 211 212
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
        if (dinfo && dinfo->type == type
            && dinfo->bus == bus && dinfo->unit == unit) {
213
            return dinfo;
214
        }
215 216 217 218 219
    }

    return NULL;
}

J
John Snow 已提交
220 221
bool drive_check_orphaned(void)
{
222
    BlockBackend *blk;
J
John Snow 已提交
223 224 225
    DriveInfo *dinfo;
    bool rs = false;

226 227
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
J
John Snow 已提交
228 229
        /* If dinfo->bdrv->dev is NULL, it has no device attached. */
        /* Unless this is a default drive, this may be an oversight. */
230
        if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
J
John Snow 已提交
231 232 233
            dinfo->type != IF_NONE) {
            fprintf(stderr, "Warning: Orphaned drive without device: "
                    "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
M
Max Reitz 已提交
234 235
                    blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
                    if_name[dinfo->type], dinfo->bus, dinfo->unit);
J
John Snow 已提交
236 237 238 239 240 241 242
            rs = true;
        }
    }

    return rs;
}

243 244 245 246 247 248 249
DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
{
    return drive_get(type,
                     drive_index_to_bus_id(type, index),
                     drive_index_to_unit_id(type, index));
}

250 251 252
int drive_get_max_bus(BlockInterfaceType type)
{
    int max_bus;
253
    BlockBackend *blk;
254 255 256
    DriveInfo *dinfo;

    max_bus = -1;
257 258 259
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
        if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
260
            max_bus = dinfo->bus;
261
        }
262 263 264 265
    }
    return max_bus;
}

266 267 268 269 270 271 272 273 274 275
/* Get a block device.  This should only be used for single-drive devices
   (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
   appropriate bus.  */
DriveInfo *drive_get_next(BlockInterfaceType type)
{
    static int next_block_unit[IF_COUNT];

    return drive_get(type, 0, next_block_unit[type]++);
}

276 277
static void bdrv_format_print(void *opaque, const char *name)
{
278
    error_printf(" %s", name);
279 280
}

281 282
typedef struct {
    QEMUBH *bh;
F
Fam Zheng 已提交
283 284
    BlockDriverState *bs;
} BDRVPutRefBH;
285

F
Fam Zheng 已提交
286
static void bdrv_put_ref_bh(void *opaque)
287
{
F
Fam Zheng 已提交
288
    BDRVPutRefBH *s = opaque;
289

F
Fam Zheng 已提交
290
    bdrv_unref(s->bs);
291 292 293 294 295
    qemu_bh_delete(s->bh);
    g_free(s);
}

/*
F
Fam Zheng 已提交
296
 * Release a BDS reference in a BH
297
 *
F
Fam Zheng 已提交
298 299 300
 * It is not safe to use bdrv_unref() from a callback function when the callers
 * still need the BlockDriverState.  In such cases we schedule a BH to release
 * the reference.
301
 */
F
Fam Zheng 已提交
302
static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
303
{
F
Fam Zheng 已提交
304
    BDRVPutRefBH *s;
305

F
Fam Zheng 已提交
306 307 308
    s = g_new(BDRVPutRefBH, 1);
    s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
    s->bs = bs;
309 310 311
    qemu_bh_schedule(s->bh);
}

312
static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
313 314
{
    if (!strcmp(buf, "ignore")) {
315
        return BLOCKDEV_ON_ERROR_IGNORE;
316
    } else if (!is_read && !strcmp(buf, "enospc")) {
317
        return BLOCKDEV_ON_ERROR_ENOSPC;
318
    } else if (!strcmp(buf, "stop")) {
319
        return BLOCKDEV_ON_ERROR_STOP;
320
    } else if (!strcmp(buf, "report")) {
321
        return BLOCKDEV_ON_ERROR_REPORT;
322
    } else {
323 324
        error_setg(errp, "'%s' invalid %s error action",
                   buf, is_read ? "read" : "write");
325 326 327 328
        return -1;
    }
}

329
static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
330
{
331 332 333
    if (throttle_conflicting(cfg)) {
        error_setg(errp, "bps/iops/max total values and read/write values"
                         " cannot be used at the same time");
334 335 336
        return false;
    }

337 338
    if (!throttle_is_valid(cfg)) {
        error_setg(errp, "bps/iops/maxs values must be 0 or greater");
339 340 341
        return false;
    }

342 343 344 345 346 347
    if (throttle_max_is_missing_limit(cfg)) {
        error_setg(errp, "bps_max/iops_max require corresponding"
                         " bps/iops values");
        return false;
    }

348 349 350
    return true;
}

351 352
typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;

353
/* Takes the ownership of bs_opts */
354 355
static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
                                   Error **errp)
356 357 358 359 360
{
    const char *buf;
    int ro = 0;
    int bdrv_flags = 0;
    int on_read_error, on_write_error;
M
Markus Armbruster 已提交
361
    BlockBackend *blk;
362
    BlockDriverState *bs;
363
    ThrottleConfig cfg;
364
    int snapshot = 0;
365
    bool copy_on_read;
366
    Error *error = NULL;
367 368
    QemuOpts *opts;
    const char *id;
369
    bool has_driver_specific_opts;
370
    BlockdevDetectZeroesOptions detect_zeroes;
371
    const char *throttling_group;
372

373 374 375
    /* Check common options by copying from bs_opts to opts, all other options
     * stay in bs_opts for processing by bdrv_open(). */
    id = qdict_get_try_str(bs_opts, "id");
376
    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
377
    if (error) {
378
        error_propagate(errp, error);
379
        goto err_no_opts;
380 381 382
    }

    qemu_opts_absorb_qdict(opts, bs_opts, &error);
383
    if (error) {
384
        error_propagate(errp, error);
385
        goto early_err;
386 387 388 389 390 391
    }

    if (id) {
        qdict_del(bs_opts, "id");
    }

392 393
    has_driver_specific_opts = !!qdict_size(bs_opts);

394 395
    /* extract parameters */
    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
396
    ro = qemu_opt_get_bool(opts, "read-only", 0);
397
    copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
398

399 400
    if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
        if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
401
            error_setg(errp, "invalid discard option");
402
            goto early_err;
403 404 405
        }
    }

406
    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
K
Kevin Wolf 已提交
407 408
        bdrv_flags |= BDRV_O_CACHE_WB;
    }
409
    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
K
Kevin Wolf 已提交
410 411
        bdrv_flags |= BDRV_O_NOCACHE;
    }
412
    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
K
Kevin Wolf 已提交
413
        bdrv_flags |= BDRV_O_NO_FLUSH;
414 415 416 417 418 419 420 421
    }

    if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
        if (!strcmp(buf, "native")) {
            bdrv_flags |= BDRV_O_NATIVE_AIO;
        } else if (!strcmp(buf, "threads")) {
            /* this is the default */
        } else {
422
           error_setg(errp, "invalid aio option");
423
           goto early_err;
424 425 426 427
        }
    }

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
428 429 430 431
        if (is_help_option(buf)) {
            error_printf("Supported formats:");
            bdrv_iterate_format(bdrv_format_print, NULL);
            error_printf("\n");
432
            goto early_err;
433
        }
434

435 436
        if (qdict_haskey(bs_opts, "driver")) {
            error_setg(errp, "Cannot specify both 'driver' and 'format'");
437
            goto early_err;
438
        }
439
        qdict_put(bs_opts, "driver", qstring_from_str(buf));
440 441
    }

442
    /* disk I/O throttling */
443 444
    memset(&cfg, 0, sizeof(cfg));
    cfg.buckets[THROTTLE_BPS_TOTAL].avg =
445
        qemu_opt_get_number(opts, "throttling.bps-total", 0);
446
    cfg.buckets[THROTTLE_BPS_READ].avg  =
447
        qemu_opt_get_number(opts, "throttling.bps-read", 0);
448
    cfg.buckets[THROTTLE_BPS_WRITE].avg =
449
        qemu_opt_get_number(opts, "throttling.bps-write", 0);
450
    cfg.buckets[THROTTLE_OPS_TOTAL].avg =
451
        qemu_opt_get_number(opts, "throttling.iops-total", 0);
452
    cfg.buckets[THROTTLE_OPS_READ].avg =
453
        qemu_opt_get_number(opts, "throttling.iops-read", 0);
454
    cfg.buckets[THROTTLE_OPS_WRITE].avg =
455
        qemu_opt_get_number(opts, "throttling.iops-write", 0);
456

457 458 459 460 461 462 463 464 465 466 467 468
    cfg.buckets[THROTTLE_BPS_TOTAL].max =
        qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
    cfg.buckets[THROTTLE_BPS_READ].max  =
        qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
    cfg.buckets[THROTTLE_BPS_WRITE].max =
        qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
    cfg.buckets[THROTTLE_OPS_TOTAL].max =
        qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
    cfg.buckets[THROTTLE_OPS_READ].max =
        qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
    cfg.buckets[THROTTLE_OPS_WRITE].max =
        qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
469

470
    cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
471

472 473
    throttling_group = qemu_opt_get(opts, "throttling.group");

474
    if (!check_throttle_config(&cfg, &error)) {
475
        error_propagate(errp, error);
476
        goto early_err;
477 478
    }

479
    on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
480
    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
481
        on_write_error = parse_block_error_action(buf, 0, &error);
482
        if (error) {
483
            error_propagate(errp, error);
484
            goto early_err;
485 486 487
        }
    }

488
    on_read_error = BLOCKDEV_ON_ERROR_REPORT;
489
    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
490
        on_read_error = parse_block_error_action(buf, 1, &error);
491
        if (error) {
492
            error_propagate(errp, error);
493
            goto early_err;
494 495 496
        }
    }

497
    detect_zeroes =
498 499 500 501 502
        qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
                        qemu_opt_get(opts, "detect-zeroes"),
                        BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
                        BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
                        &error);
503 504 505 506 507 508 509 510 511 512 513 514
    if (error) {
        error_propagate(errp, error);
        goto early_err;
    }

    if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
        !(bdrv_flags & BDRV_O_UNMAP)) {
        error_setg(errp, "setting detect-zeroes to unmap is not allowed "
                         "without setting discard operation to unmap");
        goto early_err;
    }

515
    /* init */
516 517 518 519 520
    if ((!file || !*file) && !has_driver_specific_opts) {
        blk = blk_new_with_bs(qemu_opts_id(opts), errp);
        if (!blk) {
            goto early_err;
        }
521

522 523 524
        bs = blk_bs(blk);
        bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
        bs->read_only = ro;
525

526 527 528
        QDECREF(bs_opts);
    } else {
        if (file && !*file) {
529 530
            file = NULL;
        }
531

532 533 534 535 536 537 538 539 540
        if (snapshot) {
            /* always use cache=unsafe with snapshot */
            bdrv_flags &= ~BDRV_O_CACHE_MASK;
            bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
        }

        if (copy_on_read) {
            bdrv_flags |= BDRV_O_COPY_ON_READ;
        }
541

542 543 544 545 546 547 548 549
        bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

        blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
                           errp);
        if (!blk) {
            goto err_no_bs_opts;
        }
        bs = blk_bs(blk);
550 551
    }

552
    bs->detect_zeroes = detect_zeroes;
553

554
    blk_set_on_error(blk, on_read_error, on_write_error);
555

556 557
    /* disk I/O throttling */
    if (throttle_enabled(&cfg)) {
558 559 560 561
        if (!throttling_group) {
            throttling_group = blk_name(blk);
        }
        bdrv_io_limits_enable(bs, throttling_group);
562
        bdrv_set_io_limits(bs, &cfg);
563 564
    }

565
    if (bdrv_key_required(bs)) {
566
        autostart = 0;
567
    }
568

569
err_no_bs_opts:
570
    qemu_opts_del(opts);
571
    return blk;
572

573 574
early_err:
    qemu_opts_del(opts);
575 576
err_no_opts:
    QDECREF(bs_opts);
577
    return NULL;
578 579
}

580 581
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
                            Error **errp)
582 583 584 585 586
{
    const char *value;

    value = qemu_opt_get(opts, from);
    if (value) {
587 588 589 590 591
        if (qemu_opt_find(opts, to)) {
            error_setg(errp, "'%s' and its alias '%s' can't be used at the "
                       "same time", to, from);
            return;
        }
592 593 594 595
    }

    /* rename all items in opts */
    while ((value = qemu_opt_get(opts, from))) {
596
        qemu_opt_set(opts, to, value, &error_abort);
597 598 599 600
        qemu_opt_unset(opts, from);
    }
}

601 602 603 604 605
QemuOptsList qemu_legacy_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
    .desc = {
        {
606 607 608 609 610 611 612 613 614 615 616 617
            .name = "bus",
            .type = QEMU_OPT_NUMBER,
            .help = "bus number",
        },{
            .name = "unit",
            .type = QEMU_OPT_NUMBER,
            .help = "unit number (i.e. lun for scsi)",
        },{
            .name = "index",
            .type = QEMU_OPT_NUMBER,
            .help = "index number",
        },{
618 619 620
            .name = "media",
            .type = QEMU_OPT_STRING,
            .help = "media type (disk, cdrom)",
621 622 623 624
        },{
            .name = "if",
            .type = QEMU_OPT_STRING,
            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640
        },{
            .name = "cyls",
            .type = QEMU_OPT_NUMBER,
            .help = "number of cylinders (ide disk geometry)",
        },{
            .name = "heads",
            .type = QEMU_OPT_NUMBER,
            .help = "number of heads (ide disk geometry)",
        },{
            .name = "secs",
            .type = QEMU_OPT_NUMBER,
            .help = "number of sectors (ide disk geometry)",
        },{
            .name = "trans",
            .type = QEMU_OPT_STRING,
            .help = "chs translation (auto, lba, none)",
641 642 643 644
        },{
            .name = "boot",
            .type = QEMU_OPT_BOOL,
            .help = "(deprecated, ignored)",
645 646 647 648
        },{
            .name = "addr",
            .type = QEMU_OPT_STRING,
            .help = "pci address (virtio only)",
649 650 651 652
        },{
            .name = "serial",
            .type = QEMU_OPT_STRING,
            .help = "disk serial number",
M
Max Reitz 已提交
653 654 655 656
        },{
            .name = "file",
            .type = QEMU_OPT_STRING,
            .help = "file name",
657
        },
658 659 660 661 662 663

        /* Options that are passed on, but have special semantics with -drive */
        {
            .name = "read-only",
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
664 665 666 667 668 669 670 671
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
672 673 674 675 676 677
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },

678 679 680 681
        { /* end of list */ }
    },
};

682
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
683
{
K
Kevin Wolf 已提交
684
    const char *value;
685
    BlockBackend *blk;
686
    DriveInfo *dinfo = NULL;
687
    QDict *bs_opts;
688 689
    QemuOpts *legacy_opts;
    DriveMediaType media = MEDIA_DISK;
690
    BlockInterfaceType type;
691
    int cyls, heads, secs, translation;
692
    int max_devs, bus_id, unit_id, index;
693
    const char *devaddr;
694
    const char *werror, *rerror;
F
Fam Zheng 已提交
695 696
    bool read_only = false;
    bool copy_on_read;
697
    const char *serial;
M
Max Reitz 已提交
698
    const char *filename;
699
    Error *local_err = NULL;
700
    int i;
K
Kevin Wolf 已提交
701

702
    /* Change legacy command line options into QMP ones */
703 704 705 706 707 708 709
    static const struct {
        const char *from;
        const char *to;
    } opt_renames[] = {
        { "iops",           "throttling.iops-total" },
        { "iops_rd",        "throttling.iops-read" },
        { "iops_wr",        "throttling.iops-write" },
710

711 712 713
        { "bps",            "throttling.bps-total" },
        { "bps_rd",         "throttling.bps-read" },
        { "bps_wr",         "throttling.bps-write" },
714

715 716 717
        { "iops_max",       "throttling.iops-total-max" },
        { "iops_rd_max",    "throttling.iops-read-max" },
        { "iops_wr_max",    "throttling.iops-write-max" },
718

719 720 721
        { "bps_max",        "throttling.bps-total-max" },
        { "bps_rd_max",     "throttling.bps-read-max" },
        { "bps_wr_max",     "throttling.bps-write-max" },
722

723
        { "iops_size",      "throttling.iops-size" },
724

725 726
        { "group",          "throttling.group" },

727 728 729 730
        { "readonly",       "read-only" },
    };

    for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
731 732 733
        qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
                        &local_err);
        if (local_err) {
734
            error_report_err(local_err);
735 736
            return NULL;
        }
737
    }
738

K
Kevin Wolf 已提交
739 740 741 742 743 744 745 746 747 748
    value = qemu_opt_get(all_opts, "cache");
    if (value) {
        int flags = 0;

        if (bdrv_parse_cache_flags(value, &flags) != 0) {
            error_report("invalid cache option");
            return NULL;
        }

        /* Specific options take precedence */
749 750
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
751
                              !!(flags & BDRV_O_CACHE_WB), &error_abort);
K
Kevin Wolf 已提交
752
        }
753 754
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
755
                              !!(flags & BDRV_O_NOCACHE), &error_abort);
K
Kevin Wolf 已提交
756
        }
757 758
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
759
                              !!(flags & BDRV_O_NO_FLUSH), &error_abort);
K
Kevin Wolf 已提交
760 761 762 763
        }
        qemu_opt_unset(all_opts, "cache");
    }

764 765 766 767
    /* Get a QDict for processing the options */
    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);

768 769
    legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                   &error_abort);
770
    qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
771
    if (local_err) {
772
        error_report_err(local_err);
773 774 775
        goto fail;
    }

776 777 778 779 780 781 782
    /* Deprecated option boot=[on|off] */
    if (qemu_opt_get(legacy_opts, "boot") != NULL) {
        fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
                "ignored. Future versions will reject this parameter. Please "
                "update your scripts.\n");
    }

783 784 785 786 787 788 789
    /* Media type */
    value = qemu_opt_get(legacy_opts, "media");
    if (value) {
        if (!strcmp(value, "disk")) {
            media = MEDIA_DISK;
        } else if (!strcmp(value, "cdrom")) {
            media = MEDIA_CDROM;
F
Fam Zheng 已提交
790
            read_only = true;
791 792 793 794 795 796
        } else {
            error_report("'%s' invalid media", value);
            goto fail;
        }
    }

797
    /* copy-on-read is disabled with a warning for read-only devices */
F
Fam Zheng 已提交
798
    read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
799 800 801 802 803 804 805 806 807 808 809 810
    copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);

    if (read_only && copy_on_read) {
        error_report("warning: disabling copy-on-read on read-only drive");
        copy_on_read = false;
    }

    qdict_put(bs_opts, "read-only",
              qstring_from_str(read_only ? "on" : "off"));
    qdict_put(bs_opts, "copy-on-read",
              qstring_from_str(copy_on_read ? "on" :"off"));

811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
    /* Controller type */
    value = qemu_opt_get(legacy_opts, "if");
    if (value) {
        for (type = 0;
             type < IF_COUNT && strcmp(value, if_name[type]);
             type++) {
        }
        if (type == IF_COUNT) {
            error_report("unsupported bus type '%s'", value);
            goto fail;
        }
    } else {
        type = block_default_type;
    }

826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
    /* Geometry */
    cyls  = qemu_opt_get_number(legacy_opts, "cyls", 0);
    heads = qemu_opt_get_number(legacy_opts, "heads", 0);
    secs  = qemu_opt_get_number(legacy_opts, "secs", 0);

    if (cyls || heads || secs) {
        if (cyls < 1) {
            error_report("invalid physical cyls number");
            goto fail;
        }
        if (heads < 1) {
            error_report("invalid physical heads number");
            goto fail;
        }
        if (secs < 1) {
            error_report("invalid physical secs number");
            goto fail;
        }
    }

    translation = BIOS_ATA_TRANSLATION_AUTO;
    value = qemu_opt_get(legacy_opts, "trans");
    if (value != NULL) {
        if (!cyls) {
            error_report("'%s' trans must be used with cyls, heads and secs",
                         value);
            goto fail;
        }
        if (!strcmp(value, "none")) {
            translation = BIOS_ATA_TRANSLATION_NONE;
        } else if (!strcmp(value, "lba")) {
            translation = BIOS_ATA_TRANSLATION_LBA;
858 859 860 861
        } else if (!strcmp(value, "large")) {
            translation = BIOS_ATA_TRANSLATION_LARGE;
        } else if (!strcmp(value, "rechs")) {
            translation = BIOS_ATA_TRANSLATION_RECHS;
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
        } else if (!strcmp(value, "auto")) {
            translation = BIOS_ATA_TRANSLATION_AUTO;
        } else {
            error_report("'%s' invalid translation type", value);
            goto fail;
        }
    }

    if (media == MEDIA_CDROM) {
        if (cyls || secs || heads) {
            error_report("CHS can't be set with media=cdrom");
            goto fail;
        }
    }

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915
    /* Device address specified by bus/unit or index.
     * If none was specified, try to find the first free one. */
    bus_id  = qemu_opt_get_number(legacy_opts, "bus", 0);
    unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
    index   = qemu_opt_get_number(legacy_opts, "index", -1);

    max_devs = if_max_devs[type];

    if (index != -1) {
        if (bus_id != 0 || unit_id != -1) {
            error_report("index cannot be used with bus and unit");
            goto fail;
        }
        bus_id = drive_index_to_bus_id(type, index);
        unit_id = drive_index_to_unit_id(type, index);
    }

    if (unit_id == -1) {
       unit_id = 0;
       while (drive_get(type, bus_id, unit_id) != NULL) {
           unit_id++;
           if (max_devs && unit_id >= max_devs) {
               unit_id -= max_devs;
               bus_id++;
           }
       }
    }

    if (max_devs && unit_id >= max_devs) {
        error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
        goto fail;
    }

    if (drive_get(type, bus_id, unit_id) != NULL) {
        error_report("drive with bus=%d, unit=%d (index=%d) exists",
                     bus_id, unit_id, index);
        goto fail;
    }

916 917 918
    /* Serial number */
    serial = qemu_opt_get(legacy_opts, "serial");

919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
    /* no id supplied -> create one */
    if (qemu_opts_id(all_opts) == NULL) {
        char *new_id;
        const char *mediastr = "";
        if (type == IF_IDE || type == IF_SCSI) {
            mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
        }
        if (max_devs) {
            new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
                                     mediastr, unit_id);
        } else {
            new_id = g_strdup_printf("%s%s%i", if_name[type],
                                     mediastr, unit_id);
        }
        qdict_put(bs_opts, "id", qstring_from_str(new_id));
        g_free(new_id);
    }

937 938 939 940 941 942 943 944 945
    /* Add virtio block device */
    devaddr = qemu_opt_get(legacy_opts, "addr");
    if (devaddr && type != IF_VIRTIO) {
        error_report("addr is not supported by this bus type");
        goto fail;
    }

    if (type == IF_VIRTIO) {
        QemuOpts *devopts;
946 947
        devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
                                   &error_abort);
948
        if (arch_type == QEMU_ARCH_S390X) {
949
            qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
950
        } else {
951
            qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
952
        }
953 954
        qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
                     &error_abort);
955
        if (devaddr) {
956
            qemu_opt_set(devopts, "addr", devaddr, &error_abort);
957 958 959
        }
    }

M
Max Reitz 已提交
960 961
    filename = qemu_opt_get(legacy_opts, "file");

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
    /* Check werror/rerror compatibility with if=... */
    werror = qemu_opt_get(legacy_opts, "werror");
    if (werror != NULL) {
        if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
            type != IF_NONE) {
            error_report("werror is not supported by this bus type");
            goto fail;
        }
        qdict_put(bs_opts, "werror", qstring_from_str(werror));
    }

    rerror = qemu_opt_get(legacy_opts, "rerror");
    if (rerror != NULL) {
        if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
            type != IF_NONE) {
            error_report("rerror is not supported by this bus type");
            goto fail;
        }
        qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
    }

983
    /* Actual block device init: Functionality shared with blockdev-add */
984
    blk = blockdev_init(filename, bs_opts, &local_err);
985
    bs_opts = NULL;
986
    if (!blk) {
987
        if (local_err) {
988
            error_report_err(local_err);
989
        }
990
        goto fail;
991
    } else {
992
        assert(!local_err);
993 994
    }

995 996
    /* Create legacy DriveInfo */
    dinfo = g_malloc0(sizeof(*dinfo));
997
    dinfo->opts = all_opts;
998

999 1000 1001 1002 1003
    dinfo->cyls = cyls;
    dinfo->heads = heads;
    dinfo->secs = secs;
    dinfo->trans = translation;

1004
    dinfo->type = type;
1005 1006
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
1007
    dinfo->devaddr = devaddr;
1008 1009
    dinfo->serial = g_strdup(serial);

1010 1011
    blk_set_legacy_dinfo(blk, dinfo);

1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        dinfo->media_cd = media == MEDIA_CDROM;
        break;
    default:
        break;
    }

1023
fail:
1024
    qemu_opts_del(legacy_opts);
1025
    QDECREF(bs_opts);
1026
    return dinfo;
1027 1028
}

1029
void hmp_commit(Monitor *mon, const QDict *qdict)
1030 1031
{
    const char *device = qdict_get_str(qdict, "device");
1032
    BlockBackend *blk;
1033
    int ret;
1034

1035
    if (!strcmp(device, "all")) {
1036
        ret = bdrv_commit_all();
1037
    } else {
1038 1039
        blk = blk_by_name(device);
        if (!blk) {
1040
            monitor_printf(mon, "Device '%s' not found\n", device);
1041
            return;
1042
        }
M
Max Reitz 已提交
1043 1044 1045 1046
        if (!blk_is_available(blk)) {
            monitor_printf(mon, "Device '%s' has no medium\n", device);
            return;
        }
1047
        ret = bdrv_commit(blk_bs(blk));
1048 1049 1050 1051
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
1052 1053 1054
    }
}

1055 1056
static void blockdev_do_action(int kind, void *data, Error **errp)
{
1057 1058
    TransactionAction action;
    TransactionActionList list;
1059 1060 1061 1062 1063 1064 1065 1066

    action.kind = kind;
    action.data = data;
    list.value = &action;
    list.next = NULL;
    qmp_transaction(&list, errp);
}

1067 1068 1069 1070 1071
void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
                                bool has_node_name, const char *node_name,
                                const char *snapshot_file,
                                bool has_snapshot_node_name,
                                const char *snapshot_node_name,
1072
                                bool has_format, const char *format,
1073
                                bool has_mode, NewImageMode mode, Error **errp)
1074
{
1075
    BlockdevSnapshot snapshot = {
1076
        .has_device = has_device,
1077
        .device = (char *) device,
1078 1079
        .has_node_name = has_node_name,
        .node_name = (char *) node_name,
1080
        .snapshot_file = (char *) snapshot_file,
1081 1082
        .has_snapshot_node_name = has_snapshot_node_name,
        .snapshot_node_name = (char *) snapshot_node_name,
1083 1084 1085 1086 1087
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
1088 1089
    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
                       &snapshot, errp);
1090 1091
}

1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
void qmp_blockdev_snapshot_internal_sync(const char *device,
                                         const char *name,
                                         Error **errp)
{
    BlockdevSnapshotInternal snapshot = {
        .device = (char *) device,
        .name = (char *) name
    };

    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
                       &snapshot, errp);
}

1105 1106 1107 1108 1109 1110 1111
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                         bool has_id,
                                                         const char *id,
                                                         bool has_name,
                                                         const char *name,
                                                         Error **errp)
{
1112 1113
    BlockDriverState *bs;
    BlockBackend *blk;
1114
    AioContext *aio_context;
1115 1116 1117 1118 1119
    QEMUSnapshotInfo sn;
    Error *local_err = NULL;
    SnapshotInfo *info = NULL;
    int ret;

1120 1121
    blk = blk_by_name(device);
    if (!blk) {
1122 1123
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
1124 1125
        return NULL;
    }
M
Max Reitz 已提交
1126 1127 1128

    aio_context = blk_get_aio_context(blk);
    aio_context_acquire(aio_context);
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139

    if (!has_id) {
        id = NULL;
    }

    if (!has_name) {
        name = NULL;
    }

    if (!id && !name) {
        error_setg(errp, "Name or id must be provided");
M
Max Reitz 已提交
1140
        goto out_aio_context;
1141 1142
    }

M
Max Reitz 已提交
1143 1144 1145 1146 1147
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out_aio_context;
    }
    bs = blk_bs(blk);
1148

1149 1150 1151 1152
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
        goto out_aio_context;
    }

1153
    ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1154
    if (local_err) {
1155
        error_propagate(errp, local_err);
1156
        goto out_aio_context;
1157 1158 1159 1160 1161 1162
    }
    if (!ret) {
        error_setg(errp,
                   "Snapshot with id '%s' and name '%s' does not exist on "
                   "device '%s'",
                   STR_OR_NULL(id), STR_OR_NULL(name), device);
1163
        goto out_aio_context;
1164 1165 1166
    }

    bdrv_snapshot_delete(bs, id, name, &local_err);
1167
    if (local_err) {
1168
        error_propagate(errp, local_err);
1169
        goto out_aio_context;
1170 1171
    }

1172 1173
    aio_context_release(aio_context);

1174
    info = g_new0(SnapshotInfo, 1);
1175 1176 1177 1178 1179 1180 1181 1182 1183
    info->id = g_strdup(sn.id_str);
    info->name = g_strdup(sn.name);
    info->date_nsec = sn.date_nsec;
    info->date_sec = sn.date_sec;
    info->vm_state_size = sn.vm_state_size;
    info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
    info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;

    return info;
1184 1185 1186 1187

out_aio_context:
    aio_context_release(aio_context);
    return NULL;
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 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
/**
 * block_dirty_bitmap_lookup:
 * Return a dirty bitmap (if present), after validating
 * the node reference and bitmap names.
 *
 * @node: The name of the BDS node to search for bitmaps
 * @name: The name of the bitmap to search for
 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
 * @errp: Output pointer for error information. Can be NULL.
 *
 * @return: A bitmap object on success, or NULL on failure.
 */
static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
                                                  const char *name,
                                                  BlockDriverState **pbs,
                                                  AioContext **paio,
                                                  Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;
    AioContext *aio_context;

    if (!node) {
        error_setg(errp, "Node cannot be NULL");
        return NULL;
    }
    if (!name) {
        error_setg(errp, "Bitmap name cannot be NULL");
        return NULL;
    }
    bs = bdrv_lookup_bs(node, node, NULL);
    if (!bs) {
        error_setg(errp, "Node '%s' not found", node);
        return NULL;
    }

    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    bitmap = bdrv_find_dirty_bitmap(bs, name);
    if (!bitmap) {
        error_setg(errp, "Dirty bitmap '%s' not found", name);
        goto fail;
    }

    if (pbs) {
        *pbs = bs;
    }
    if (paio) {
        *paio = aio_context;
    } else {
        aio_context_release(aio_context);
    }

    return bitmap;

 fail:
    aio_context_release(aio_context);
    return NULL;
}

1252
/* New and old BlockDriverState structs for atomic group operations */
1253

1254
typedef struct BlkTransactionState BlkTransactionState;
1255 1256 1257 1258 1259 1260 1261

/* Only prepare() may fail. In a single transaction, only one of commit() or
   abort() will be called, clean() will always be called if it present. */
typedef struct BdrvActionOps {
    /* Size of state struct, in bytes. */
    size_t instance_size;
    /* Prepare the work, must NOT be NULL. */
1262
    void (*prepare)(BlkTransactionState *common, Error **errp);
1263
    /* Commit the changes, can be NULL. */
1264
    void (*commit)(BlkTransactionState *common);
1265
    /* Abort the changes on fail, can be NULL. */
1266
    void (*abort)(BlkTransactionState *common);
1267
    /* Clean up resource in the end, can be NULL. */
1268
    void (*clean)(BlkTransactionState *common);
1269 1270 1271 1272 1273 1274 1275
} BdrvActionOps;

/*
 * This structure must be arranged as first member in child type, assuming
 * that compiler will also arrange it to the same address with parent instance.
 * Later it will be used in free().
 */
1276
struct BlkTransactionState {
1277
    TransactionAction *action;
1278
    const BdrvActionOps *ops;
1279
    QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1280 1281
};

1282 1283 1284 1285
/* internal snapshot private data */
typedef struct InternalSnapshotState {
    BlkTransactionState common;
    BlockDriverState *bs;
1286
    AioContext *aio_context;
1287 1288 1289 1290 1291 1292
    QEMUSnapshotInfo sn;
} InternalSnapshotState;

static void internal_snapshot_prepare(BlkTransactionState *common,
                                      Error **errp)
{
1293
    Error *local_err = NULL;
1294 1295
    const char *device;
    const char *name;
1296
    BlockBackend *blk;
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
    BlockDriverState *bs;
    QEMUSnapshotInfo old_sn, *sn;
    bool ret;
    qemu_timeval tv;
    BlockdevSnapshotInternal *internal;
    InternalSnapshotState *state;
    int ret1;

    g_assert(common->action->kind ==
             TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
    internal = common->action->blockdev_snapshot_internal_sync;
    state = DO_UPCAST(InternalSnapshotState, common, common);

    /* 1. parse input */
    device = internal->device;
    name = internal->name;

    /* 2. check for validation */
1315 1316
    blk = blk_by_name(device);
    if (!blk) {
1317 1318
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
1319 1320 1321
        return;
    }

1322
    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1323
    state->aio_context = blk_get_aio_context(blk);
1324 1325
    aio_context_acquire(state->aio_context);

M
Max Reitz 已提交
1326
    if (!blk_is_available(blk)) {
1327
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1328 1329
        return;
    }
M
Max Reitz 已提交
1330
    bs = blk_bs(blk);
1331

1332 1333 1334 1335
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
        return;
    }

1336
    if (bdrv_is_read_only(bs)) {
1337
        error_setg(errp, "Device '%s' is read only", device);
1338 1339 1340 1341
        return;
    }

    if (!bdrv_can_snapshot(bs)) {
1342 1343 1344
        error_setg(errp, "Block format '%s' used by device '%s' "
                   "does not support internal snapshots",
                   bs->drv->format_name, device);
1345 1346 1347 1348 1349 1350 1351 1352 1353
        return;
    }

    if (!strlen(name)) {
        error_setg(errp, "Name is empty");
        return;
    }

    /* check whether a snapshot with name exist */
1354 1355 1356 1357
    ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
                                            &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
        return;
    } else if (ret) {
        error_setg(errp,
                   "Snapshot with name '%s' already exists on device '%s'",
                   name, device);
        return;
    }

    /* 3. take the snapshot */
    sn = &state->sn;
    pstrcpy(sn->name, sizeof(sn->name), name);
    qemu_gettimeofday(&tv);
    sn->date_sec = tv.tv_sec;
    sn->date_nsec = tv.tv_usec * 1000;
    sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

    ret1 = bdrv_snapshot_create(bs, sn);
    if (ret1 < 0) {
        error_setg_errno(errp, -ret1,
                         "Failed to create snapshot '%s' on device '%s'",
                         name, device);
        return;
    }

    /* 4. succeed, mark a snapshot is created */
    state->bs = bs;
}

static void internal_snapshot_abort(BlkTransactionState *common)
{
    InternalSnapshotState *state =
                             DO_UPCAST(InternalSnapshotState, common, common);
    BlockDriverState *bs = state->bs;
    QEMUSnapshotInfo *sn = &state->sn;
    Error *local_error = NULL;

    if (!bs) {
        return;
    }

    if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
        error_report("Failed to delete snapshot with id '%s' and name '%s' on "
                     "device '%s' in abort: %s",
                     sn->id_str,
                     sn->name,
                     bdrv_get_device_name(bs),
                     error_get_pretty(local_error));
        error_free(local_error);
    }
}

1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
static void internal_snapshot_clean(BlkTransactionState *common)
{
    InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
                                             common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1419
/* external snapshot private data */
1420 1421
typedef struct ExternalSnapshotState {
    BlkTransactionState common;
1422 1423
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
1424
    AioContext *aio_context;
1425
} ExternalSnapshotState;
1426

1427
static void external_snapshot_prepare(BlkTransactionState *common,
1428 1429 1430
                                      Error **errp)
{
    int flags, ret;
1431
    QDict *options;
1432
    Error *local_err = NULL;
1433
    bool has_device = false;
1434
    const char *device;
1435 1436 1437 1438
    bool has_node_name = false;
    const char *node_name;
    bool has_snapshot_node_name = false;
    const char *snapshot_node_name;
1439 1440 1441
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1442 1443
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1444
    TransactionAction *action = common->action;
1445

1446
    /* get parameters */
1447
    g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1448

1449
    has_device = action->blockdev_snapshot_sync->has_device;
1450
    device = action->blockdev_snapshot_sync->device;
1451 1452 1453 1454 1455 1456
    has_node_name = action->blockdev_snapshot_sync->has_node_name;
    node_name = action->blockdev_snapshot_sync->node_name;
    has_snapshot_node_name =
        action->blockdev_snapshot_sync->has_snapshot_node_name;
    snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;

1457 1458 1459 1460 1461 1462 1463 1464 1465
    new_image_file = action->blockdev_snapshot_sync->snapshot_file;
    if (action->blockdev_snapshot_sync->has_format) {
        format = action->blockdev_snapshot_sync->format;
    }
    if (action->blockdev_snapshot_sync->has_mode) {
        mode = action->blockdev_snapshot_sync->mode;
    }

    /* start processing */
1466 1467 1468
    state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
                                   has_node_name ? node_name : NULL,
                                   &local_err);
1469
    if (local_err) {
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
        error_propagate(errp, local_err);
        return;
    }

    if (has_node_name && !has_snapshot_node_name) {
        error_setg(errp, "New snapshot node name missing");
        return;
    }

    if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
        error_setg(errp, "New snapshot node name already existing");
1481 1482 1483
        return;
    }

1484 1485 1486 1487
    /* Acquire AioContext now so any threads operating on old_bs stop */
    state->aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(state->aio_context);

1488
    if (!bdrv_is_inserted(state->old_bs)) {
1489
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1490 1491 1492
        return;
    }

1493 1494
    if (bdrv_op_is_blocked(state->old_bs,
                           BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1495 1496 1497
        return;
    }

1498 1499
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
1500
            error_setg(errp, QERR_IO_ERROR);
1501 1502 1503 1504
            return;
        }
    }

1505
    if (!bdrv_is_first_non_filter(state->old_bs)) {
1506
        error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1507 1508 1509
        return;
    }

1510
    flags = state->old_bs->open_flags;
1511 1512 1513 1514

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
1515 1516
                        state->old_bs->filename,
                        state->old_bs->drv->format_name,
1517
                        NULL, -1, flags, &local_err, false);
1518
        if (local_err) {
1519 1520 1521 1522 1523
            error_propagate(errp, local_err);
            return;
        }
    }

1524
    options = qdict_new();
1525 1526 1527 1528
    if (has_snapshot_node_name) {
        qdict_put(options, "node-name",
                  qstring_from_str(snapshot_node_name));
    }
1529
    qdict_put(options, "driver", qstring_from_str(format));
1530

1531 1532
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
1533
    assert(state->new_bs == NULL);
1534
    ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1535
                    flags | BDRV_O_NO_BACKING, &local_err);
1536
    /* We will manually add the backing_hd field to the bs later */
1537
    if (ret != 0) {
1538
        error_propagate(errp, local_err);
1539 1540 1541
    }
}

1542
static void external_snapshot_commit(BlkTransactionState *common)
1543
{
1544 1545
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1546

1547 1548
    bdrv_set_aio_context(state->new_bs, state->aio_context);

1549 1550
    /* This removes our old bs and adds the new bs */
    bdrv_append(state->new_bs, state->old_bs);
1551 1552 1553
    /* We don't need (or want) to use the transactional
     * bdrv_reopen_multiple() across all the entries at once, because we
     * don't want to abort all of them if one of them fails the reopen */
1554
    bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1555
                NULL);
1556 1557

    aio_context_release(state->aio_context);
1558 1559
}

1560
static void external_snapshot_abort(BlkTransactionState *common)
1561
{
1562 1563 1564
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
F
Fam Zheng 已提交
1565
        bdrv_unref(state->new_bs);
1566
    }
1567 1568 1569
    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
1570 1571
}

1572 1573 1574
typedef struct DriveBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
1575
    AioContext *aio_context;
1576 1577 1578 1579 1580 1581
    BlockJob *job;
} DriveBackupState;

static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1582
    BlockBackend *blk;
1583 1584 1585 1586 1587 1588
    DriveBackup *backup;
    Error *local_err = NULL;

    assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
    backup = common->action->drive_backup;

1589 1590
    blk = blk_by_name(backup->device);
    if (!blk) {
1591 1592
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", backup->device);
1593 1594 1595 1596
        return;
    }

    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1597
    state->aio_context = blk_get_aio_context(blk);
1598 1599
    aio_context_acquire(state->aio_context);

1600 1601
    qmp_drive_backup(backup->device, backup->target,
                     backup->has_format, backup->format,
1602
                     backup->sync,
1603 1604
                     backup->has_mode, backup->mode,
                     backup->has_speed, backup->speed,
1605
                     backup->has_bitmap, backup->bitmap,
1606 1607 1608
                     backup->has_on_source_error, backup->on_source_error,
                     backup->has_on_target_error, backup->on_target_error,
                     &local_err);
1609
    if (local_err) {
1610 1611 1612 1613
        error_propagate(errp, local_err);
        return;
    }

M
Max Reitz 已提交
1614
    state->bs = blk_bs(blk);
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628
    state->job = state->bs->job;
}

static void drive_backup_abort(BlkTransactionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
    BlockDriverState *bs = state->bs;

    /* Only cancel if it's the job we started */
    if (bs && bs->job && bs->job == state->job) {
        block_job_cancel_sync(bs->job);
    }
}

1629 1630 1631 1632 1633 1634 1635 1636 1637
static void drive_backup_clean(BlkTransactionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
typedef struct BlockdevBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
    BlockJob *job;
    AioContext *aio_context;
} BlockdevBackupState;

static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
    BlockdevBackup *backup;
M
Max Reitz 已提交
1649
    BlockBackend *blk, *target;
1650 1651 1652 1653 1654
    Error *local_err = NULL;

    assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
    backup = common->action->blockdev_backup;

1655 1656
    blk = blk_by_name(backup->device);
    if (!blk) {
1657
        error_setg(errp, "Device '%s' not found", backup->device);
1658 1659 1660
        return;
    }

M
Max Reitz 已提交
1661 1662
    target = blk_by_name(backup->target);
    if (!target) {
1663
        error_setg(errp, "Device '%s' not found", backup->target);
1664 1665 1666 1667
        return;
    }

    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1668 1669
    state->aio_context = blk_get_aio_context(blk);
    if (state->aio_context != blk_get_aio_context(target)) {
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
        state->aio_context = NULL;
        error_setg(errp, "Backup between two IO threads is not implemented");
        return;
    }
    aio_context_acquire(state->aio_context);

    qmp_blockdev_backup(backup->device, backup->target,
                        backup->sync,
                        backup->has_speed, backup->speed,
                        backup->has_on_source_error, backup->on_source_error,
                        backup->has_on_target_error, backup->on_target_error,
                        &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

M
Max Reitz 已提交
1687
    state->bs = blk_bs(blk);
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
    state->job = state->bs->job;
}

static void blockdev_backup_abort(BlkTransactionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
    BlockDriverState *bs = state->bs;

    /* Only cancel if it's the job we started */
    if (bs && bs->job && bs->job == state->job) {
        block_job_cancel_sync(bs->job);
    }
}

static void blockdev_backup_clean(BlkTransactionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1711 1712 1713 1714 1715 1716 1717
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
    error_setg(errp, "Transaction aborted using Abort action");
}

static void abort_commit(BlkTransactionState *common)
{
1718
    g_assert_not_reached(); /* this action never succeeds */
1719 1720
}

1721
static const BdrvActionOps actions[] = {
1722
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1723
        .instance_size = sizeof(ExternalSnapshotState),
1724 1725 1726 1727
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
    },
1728 1729 1730 1731
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
        .abort = drive_backup_abort,
1732
        .clean = drive_backup_clean,
1733
    },
1734 1735 1736 1737 1738 1739
    [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
        .instance_size = sizeof(BlockdevBackupState),
        .prepare = blockdev_backup_prepare,
        .abort = blockdev_backup_abort,
        .clean = blockdev_backup_clean,
    },
1740 1741 1742 1743 1744
    [TRANSACTION_ACTION_KIND_ABORT] = {
        .instance_size = sizeof(BlkTransactionState),
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
1745 1746 1747 1748
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
        .instance_size = sizeof(InternalSnapshotState),
        .prepare  = internal_snapshot_prepare,
        .abort = internal_snapshot_abort,
1749
        .clean = internal_snapshot_clean,
1750
    },
1751 1752
};

1753
/*
1754 1755
 * 'Atomic' group operations.  The operations are performed as a set, and if
 * any fail then we roll back all operations in the group.
1756
 */
1757
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1758
{
1759
    TransactionActionList *dev_entry = dev_list;
1760
    BlkTransactionState *state, *next;
1761
    Error *local_err = NULL;
1762

1763
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1764 1765
    QSIMPLEQ_INIT(&snap_bdrv_states);

1766
    /* drain all i/o before any operations */
1767 1768
    bdrv_drain_all();

1769
    /* We don't do anything in this loop that commits us to the operations */
1770
    while (NULL != dev_entry) {
1771
        TransactionAction *dev_info = NULL;
1772
        const BdrvActionOps *ops;
1773

1774 1775 1776
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

1777 1778 1779
        assert(dev_info->kind < ARRAY_SIZE(actions));

        ops = &actions[dev_info->kind];
1780 1781
        assert(ops->instance_size > 0);

1782 1783 1784 1785
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1786

1787
        state->ops->prepare(state, &local_err);
1788
        if (local_err) {
1789 1790
            error_propagate(errp, local_err);
            goto delete_and_fail;
1791 1792 1793
        }
    }

1794
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1795 1796 1797
        if (state->ops->commit) {
            state->ops->commit(state);
        }
1798 1799 1800 1801 1802 1803
    }

    /* success */
    goto exit;

delete_and_fail:
1804
    /* failure, and it is all-or-none; roll back all operations */
1805 1806 1807
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
1808
        }
1809 1810
    }
exit:
1811 1812 1813
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
1814
        }
1815
        g_free(state);
1816 1817 1818 1819
    }
}


1820
static void eject_device(BlockBackend *blk, int force, Error **errp)
1821
{
1822
    BlockDriverState *bs = blk_bs(blk);
1823 1824
    AioContext *aio_context;

M
Max Reitz 已提交
1825 1826 1827 1828 1829
    if (!bs) {
        /* No medium inserted, so there is nothing to do */
        return;
    }

1830 1831
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);
1832

1833
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1834
        goto out;
1835
    }
1836
    if (!blk_dev_has_removable_media(blk)) {
1837 1838
        error_setg(errp, "Device '%s' is not removable",
                   bdrv_get_device_name(bs));
1839
        goto out;
1840
    }
1841

1842 1843
    if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
        blk_dev_eject_request(blk, force);
P
Paolo Bonzini 已提交
1844
        if (!force) {
1845 1846
            error_setg(errp, "Device '%s' is locked",
                       bdrv_get_device_name(bs));
1847
            goto out;
P
Paolo Bonzini 已提交
1848
        }
1849
    }
1850

1851
    bdrv_close(bs);
1852 1853 1854

out:
    aio_context_release(aio_context);
1855 1856
}

L
Luiz Capitulino 已提交
1857
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1858
{
1859
    BlockBackend *blk;
1860

1861 1862
    blk = blk_by_name(device);
    if (!blk) {
1863 1864
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
L
Luiz Capitulino 已提交
1865
        return;
1866 1867
    }

1868
    eject_device(blk, force, errp);
1869 1870
}

1871 1872 1873
void qmp_block_passwd(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      const char *password, Error **errp)
1874
{
1875
    Error *local_err = NULL;
1876
    BlockDriverState *bs;
1877
    AioContext *aio_context;
1878

1879 1880 1881
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
1882
    if (local_err) {
1883
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1884
        return;
1885 1886
    }

1887 1888 1889
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

1890
    bdrv_add_key(bs, password, errp);
1891 1892

    aio_context_release(aio_context);
1893 1894
}

1895
/* Assumes AioContext is held */
M
Max Reitz 已提交
1896 1897
static void qmp_bdrv_open_encrypted(BlockDriverState **pbs,
                                    const char *filename,
1898
                                    int bdrv_flags, const char *format,
L
Luiz Capitulino 已提交
1899 1900
                                    const char *password, Error **errp)
{
1901
    Error *local_err = NULL;
1902
    QDict *options = NULL;
1903 1904
    int ret;

1905 1906 1907 1908 1909
    if (format) {
        options = qdict_new();
        qdict_put(options, "driver", qstring_from_str(format));
    }

M
Max Reitz 已提交
1910
    ret = bdrv_open(pbs, filename, NULL, options, bdrv_flags, &local_err);
1911
    if (ret < 0) {
1912
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1913 1914 1915
        return;
    }

M
Max Reitz 已提交
1916
    bdrv_add_key(*pbs, password, errp);
L
Luiz Capitulino 已提交
1917 1918 1919
}

void qmp_change_blockdev(const char *device, const char *filename,
1920
                         const char *format, Error **errp)
1921
{
1922
    BlockBackend *blk;
1923
    BlockDriverState *bs;
1924
    AioContext *aio_context;
1925
    int bdrv_flags;
M
Max Reitz 已提交
1926
    bool new_bs;
1927
    Error *err = NULL;
1928

1929 1930
    blk = blk_by_name(device);
    if (!blk) {
1931 1932
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
L
Luiz Capitulino 已提交
1933
        return;
1934
    }
1935
    bs = blk_bs(blk);
M
Max Reitz 已提交
1936
    new_bs = !bs;
L
Luiz Capitulino 已提交
1937

M
Max Reitz 已提交
1938
    aio_context = blk_get_aio_context(blk);
1939 1940
    aio_context_acquire(aio_context);

1941
    eject_device(blk, 0, &err);
1942
    if (err) {
L
Luiz Capitulino 已提交
1943
        error_propagate(errp, err);
1944
        goto out;
1945
    }
L
Luiz Capitulino 已提交
1946

M
Max Reitz 已提交
1947 1948 1949 1950 1951 1952 1953 1954
    bdrv_flags = blk_is_read_only(blk) ? 0 : BDRV_O_RDWR;
    bdrv_flags |= blk_get_root_state(blk)->open_flags & ~BDRV_O_RDWR;

    qmp_bdrv_open_encrypted(&bs, filename, bdrv_flags, format, NULL, &err);
    if (err) {
        error_propagate(errp, err);
        goto out;
    }
L
Luiz Capitulino 已提交
1955

M
Max Reitz 已提交
1956 1957 1958 1959 1960 1961
    if (new_bs) {
        blk_insert_bs(blk, bs);
        /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
         * NULL */
        blk_dev_change_media_cb(blk, true);
    }
1962 1963 1964

out:
    aio_context_release(aio_context);
1965
}
1966

Z
Zhi Yong Wu 已提交
1967
/* throttling disk I/O limits */
1968
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
                               int64_t bps_wr,
                               int64_t iops,
                               int64_t iops_rd,
                               int64_t iops_wr,
                               bool has_bps_max,
                               int64_t bps_max,
                               bool has_bps_rd_max,
                               int64_t bps_rd_max,
                               bool has_bps_wr_max,
                               int64_t bps_wr_max,
                               bool has_iops_max,
                               int64_t iops_max,
                               bool has_iops_rd_max,
                               int64_t iops_rd_max,
                               bool has_iops_wr_max,
1984 1985
                               int64_t iops_wr_max,
                               bool has_iops_size,
1986 1987 1988
                               int64_t iops_size,
                               bool has_group,
                               const char *group, Error **errp)
Z
Zhi Yong Wu 已提交
1989
{
1990
    ThrottleConfig cfg;
Z
Zhi Yong Wu 已提交
1991
    BlockDriverState *bs;
1992
    BlockBackend *blk;
1993
    AioContext *aio_context;
Z
Zhi Yong Wu 已提交
1994

1995 1996
    blk = blk_by_name(device);
    if (!blk) {
1997 1998
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
1999
        return;
Z
Zhi Yong Wu 已提交
2000
    }
M
Max Reitz 已提交
2001 2002 2003 2004

    aio_context = blk_get_aio_context(blk);
    aio_context_acquire(aio_context);

2005
    bs = blk_bs(blk);
M
Max Reitz 已提交
2006 2007 2008 2009
    if (!bs) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
Z
Zhi Yong Wu 已提交
2010

2011 2012 2013 2014 2015 2016 2017 2018 2019
    memset(&cfg, 0, sizeof(cfg));
    cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
    cfg.buckets[THROTTLE_BPS_READ].avg  = bps_rd;
    cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;

    cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
    cfg.buckets[THROTTLE_OPS_READ].avg  = iops_rd;
    cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;

2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037
    if (has_bps_max) {
        cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
    }
    if (has_bps_rd_max) {
        cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
    }
    if (has_bps_wr_max) {
        cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
    }
    if (has_iops_max) {
        cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
    }
    if (has_iops_rd_max) {
        cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
    }
    if (has_iops_wr_max) {
        cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
    }
Z
Zhi Yong Wu 已提交
2038

2039 2040 2041
    if (has_iops_size) {
        cfg.op_size = iops_size;
    }
2042 2043

    if (!check_throttle_config(&cfg, errp)) {
M
Max Reitz 已提交
2044
        goto out;
Z
Zhi Yong Wu 已提交
2045 2046
    }

2047 2048 2049 2050 2051 2052 2053 2054 2055
    if (throttle_enabled(&cfg)) {
        /* Enable I/O limits if they're not enabled yet, otherwise
         * just update the throttling group. */
        if (!bs->io_limits_enabled) {
            bdrv_io_limits_enable(bs, has_group ? group : device);
        } else if (has_group) {
            bdrv_io_limits_update_group(bs, group);
        }
        /* Set the new throttling configuration */
2056
        bdrv_set_io_limits(bs, &cfg);
2057 2058 2059
    } else if (bs->io_limits_enabled) {
        /* If all throttling settings are set to 0, disable I/O limits */
        bdrv_io_limits_disable(bs);
Z
Zhi Yong Wu 已提交
2060
    }
2061

M
Max Reitz 已提交
2062
out:
2063
    aio_context_release(aio_context);
Z
Zhi Yong Wu 已提交
2064 2065
}

2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 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
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
                                bool has_granularity, uint32_t granularity,
                                Error **errp)
{
    AioContext *aio_context;
    BlockDriverState *bs;

    if (!name || name[0] == '\0') {
        error_setg(errp, "Bitmap name cannot be empty");
        return;
    }

    bs = bdrv_lookup_bs(node, node, errp);
    if (!bs) {
        return;
    }

    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    if (has_granularity) {
        if (granularity < 512 || !is_power_of_2(granularity)) {
            error_setg(errp, "Granularity must be power of 2 "
                             "and at least 512");
            goto out;
        }
    } else {
        /* Default to cluster size, if available: */
        granularity = bdrv_get_default_bitmap_granularity(bs);
    }

    bdrv_create_dirty_bitmap(bs, granularity, name, errp);

 out:
    aio_context_release(aio_context);
}

void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
                                   Error **errp)
{
    AioContext *aio_context;
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;

    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
    if (!bitmap || !bs) {
        return;
    }

J
John Snow 已提交
2115 2116 2117 2118 2119 2120
    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be removed",
                   name);
        goto out;
    }
2121
    bdrv_dirty_bitmap_make_anon(bitmap);
2122 2123
    bdrv_release_dirty_bitmap(bs, bitmap);

J
John Snow 已提交
2124
 out:
2125 2126 2127
    aio_context_release(aio_context);
}

J
John Snow 已提交
2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
/**
 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
 * immediately after a full backup operation.
 */
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
                                  Error **errp)
{
    AioContext *aio_context;
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;

    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
    if (!bitmap || !bs) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be modified",
                   name);
        goto out;
    } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently disabled and cannot be cleared",
                   name);
        goto out;
    }

    bdrv_clear_dirty_bitmap(bitmap);

 out:
    aio_context_release(aio_context);
}

2162
void hmp_drive_del(Monitor *mon, const QDict *qdict)
2163 2164
{
    const char *id = qdict_get_str(qdict, "id");
2165
    BlockBackend *blk;
2166
    BlockDriverState *bs;
2167
    AioContext *aio_context;
2168
    Error *local_err = NULL;
2169

2170 2171
    blk = blk_by_name(id);
    if (!blk) {
2172
        error_report("Device '%s' not found", id);
2173
        return;
2174
    }
2175

2176
    if (!blk_legacy_dinfo(blk)) {
2177 2178
        error_report("Deleting device added with blockdev-add"
                     " is not supported");
2179
        return;
2180 2181
    }

M
Max Reitz 已提交
2182
    aio_context = blk_get_aio_context(blk);
2183 2184
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2185 2186 2187 2188 2189 2190 2191
    bs = blk_bs(blk);
    if (bs) {
        if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
            error_report_err(local_err);
            aio_context_release(aio_context);
            return;
        }
2192

M
Max Reitz 已提交
2193 2194
        bdrv_close(bs);
    }
2195

2196
    /* if we have a device attached to this BlockDriverState
2197 2198 2199 2200
     * then we need to make the drive anonymous until the device
     * can be removed.  If this is a drive with no device backing
     * then we can just get rid of the block driver state right here.
     */
2201
    if (blk_get_attached_dev(blk)) {
2202
        blk_hide_on_behalf_of_hmp_drive_del(blk);
2203
        /* Further I/O must not pause the guest */
2204 2205
        blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
                         BLOCKDEV_ON_ERROR_REPORT);
2206
    } else {
2207
        blk_unref(blk);
2208 2209
    }

2210
    aio_context_release(aio_context);
2211
}
2212

2213 2214 2215
void qmp_block_resize(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      int64_t size, Error **errp)
2216
{
2217
    Error *local_err = NULL;
2218
    BlockDriverState *bs;
2219
    AioContext *aio_context;
2220
    int ret;
2221

2222 2223 2224
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
2225
    if (local_err) {
2226 2227 2228 2229
        error_propagate(errp, local_err);
        return;
    }

2230 2231 2232
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2233
    if (!bdrv_is_first_non_filter(bs)) {
2234
        error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2235
        goto out;
2236 2237 2238
    }

    if (size < 0) {
2239
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2240
        goto out;
2241 2242
    }

2243
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2244
        error_setg(errp, QERR_DEVICE_IN_USE, device);
2245
        goto out;
2246 2247
    }

2248 2249 2250
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

2251 2252
    ret = bdrv_truncate(bs, size);
    switch (ret) {
2253 2254 2255
    case 0:
        break;
    case -ENOMEDIUM:
2256
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2257 2258
        break;
    case -ENOTSUP:
2259
        error_setg(errp, QERR_UNSUPPORTED);
2260 2261
        break;
    case -EACCES:
2262
        error_setg(errp, "Device '%s' is read only", device);
2263 2264
        break;
    case -EBUSY:
2265
        error_setg(errp, QERR_DEVICE_IN_USE, device);
2266 2267
        break;
    default:
2268
        error_setg_errno(errp, -ret, "Could not resize");
2269
        break;
2270
    }
2271 2272 2273

out:
    aio_context_release(aio_context);
2274
}
S
Stefan Hajnoczi 已提交
2275

2276
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
2277
{
2278 2279 2280 2281 2282
    /* Note that this function may be executed from another AioContext besides
     * the QEMU main loop.  If you need to access anything that assumes the
     * QEMU global mutex, use a BH or introduce a mutex.
     */

S
Stefan Hajnoczi 已提交
2283
    BlockDriverState *bs = opaque;
2284
    const char *msg = NULL;
S
Stefan Hajnoczi 已提交
2285

2286
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
2287 2288

    assert(bs->job);
2289

S
Stefan Hajnoczi 已提交
2290
    if (ret < 0) {
2291
        msg = strerror(-ret);
S
Stefan Hajnoczi 已提交
2292 2293
    }

2294
    if (block_job_is_cancelled(bs->job)) {
2295
        block_job_event_cancelled(bs->job);
2296
    } else {
2297
        block_job_event_completed(bs->job, msg);
2298
    }
2299

F
Fam Zheng 已提交
2300
    bdrv_put_ref_bh_schedule(bs);
S
Stefan Hajnoczi 已提交
2301 2302
}

2303 2304 2305 2306
void qmp_block_stream(const char *device,
                      bool has_base, const char *base,
                      bool has_backing_file, const char *backing_file,
                      bool has_speed, int64_t speed,
P
Paolo Bonzini 已提交
2307 2308
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
2309
{
2310
    BlockBackend *blk;
S
Stefan Hajnoczi 已提交
2311
    BlockDriverState *bs;
2312
    BlockDriverState *base_bs = NULL;
2313
    AioContext *aio_context;
2314
    Error *local_err = NULL;
2315
    const char *base_name = NULL;
S
Stefan Hajnoczi 已提交
2316

P
Paolo Bonzini 已提交
2317 2318 2319 2320
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

2321 2322
    blk = blk_by_name(device);
    if (!blk) {
2323 2324
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
S
Stefan Hajnoczi 已提交
2325 2326 2327
        return;
    }

M
Max Reitz 已提交
2328
    aio_context = blk_get_aio_context(blk);
2329 2330
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2331 2332 2333 2334 2335 2336
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

2337
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2338
        goto out;
2339 2340
    }

2341
    if (has_base) {
2342 2343
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
2344
            error_setg(errp, QERR_BASE_NOT_FOUND, base);
2345
            goto out;
2346
        }
2347
        assert(bdrv_get_aio_context(base_bs) == aio_context);
2348
        base_name = base;
S
Stefan Hajnoczi 已提交
2349 2350
    }

2351 2352 2353 2354 2355
    /* if we are streaming the entire chain, the result will have no backing
     * file, and specifying one is therefore an error */
    if (base_bs == NULL && has_backing_file) {
        error_setg(errp, "backing file specified, but streaming the "
                         "entire chain");
2356
        goto out;
2357 2358 2359 2360 2361 2362
    }

    /* backing_file string overrides base bs filename */
    base_name = has_backing_file ? backing_file : base_name;

    stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
P
Paolo Bonzini 已提交
2363
                 on_error, block_job_cb, bs, &local_err);
2364
    if (local_err) {
2365
        error_propagate(errp, local_err);
2366
        goto out;
S
Stefan Hajnoczi 已提交
2367 2368 2369
    }

    trace_qmp_block_stream(bs, bs->job);
2370 2371 2372

out:
    aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
2373
}
2374

2375
void qmp_block_commit(const char *device,
2376 2377
                      bool has_base, const char *base,
                      bool has_top, const char *top,
2378
                      bool has_backing_file, const char *backing_file,
2379 2380 2381
                      bool has_speed, int64_t speed,
                      Error **errp)
{
2382
    BlockBackend *blk;
2383 2384
    BlockDriverState *bs;
    BlockDriverState *base_bs, *top_bs;
2385
    AioContext *aio_context;
2386 2387 2388 2389
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
2390
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2391

2392 2393 2394 2395
    if (!has_speed) {
        speed = 0;
    }

2396 2397 2398 2399 2400
    /* Important Note:
     *  libvirt relies on the DeviceNotFound error class in order to probe for
     *  live commit feature versions; for this to work, we must make sure to
     *  perform the device lookup before any generic errors that may occur in a
     *  scenario in which all optional arguments are omitted. */
2401 2402
    blk = blk_by_name(device);
    if (!blk) {
2403 2404
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
2405
        return;
2406 2407
    }

M
Max Reitz 已提交
2408
    aio_context = blk_get_aio_context(blk);
2409 2410
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2411 2412 2413 2414 2415 2416
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

2417
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2418
        goto out;
2419 2420 2421 2422 2423
    }

    /* default top_bs is the active layer */
    top_bs = bs;

2424
    if (has_top && top) {
2425 2426 2427 2428 2429 2430 2431
        if (strcmp(bs->filename, top) != 0) {
            top_bs = bdrv_find_backing_image(bs, top);
        }
    }

    if (top_bs == NULL) {
        error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2432
        goto out;
2433 2434
    }

2435 2436
    assert(bdrv_get_aio_context(top_bs) == aio_context);

2437 2438 2439 2440 2441 2442 2443
    if (has_base && base) {
        base_bs = bdrv_find_backing_image(top_bs, base);
    } else {
        base_bs = bdrv_find_base(top_bs);
    }

    if (base_bs == NULL) {
2444
        error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2445
        goto out;
2446 2447
    }

2448 2449
    assert(bdrv_get_aio_context(base_bs) == aio_context);

2450 2451 2452 2453
    if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
        goto out;
    }

2454 2455 2456
    /* Do not allow attempts to commit an image into itself */
    if (top_bs == base_bs) {
        error_setg(errp, "cannot commit an image into itself");
2457
        goto out;
2458 2459
    }

F
Fam Zheng 已提交
2460
    if (top_bs == bs) {
2461 2462 2463
        if (has_backing_file) {
            error_setg(errp, "'backing-file' specified,"
                             " but 'top' is the active layer");
2464
            goto out;
2465
        }
F
Fam Zheng 已提交
2466 2467 2468 2469
        commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
                            bs, &local_err);
    } else {
        commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2470
                     has_backing_file ? backing_file : NULL, &local_err);
F
Fam Zheng 已提交
2471
    }
2472 2473
    if (local_err != NULL) {
        error_propagate(errp, local_err);
2474
        goto out;
2475
    }
2476 2477 2478

out:
    aio_context_release(aio_context);
2479 2480
}

2481 2482
void qmp_drive_backup(const char *device, const char *target,
                      bool has_format, const char *format,
2483
                      enum MirrorSyncMode sync,
2484 2485
                      bool has_mode, enum NewImageMode mode,
                      bool has_speed, int64_t speed,
2486
                      bool has_bitmap, const char *bitmap,
2487 2488 2489 2490
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
{
2491
    BlockBackend *blk;
2492 2493
    BlockDriverState *bs;
    BlockDriverState *target_bs;
2494
    BlockDriverState *source = NULL;
2495
    BdrvDirtyBitmap *bmap = NULL;
2496
    AioContext *aio_context;
2497
    QDict *options = NULL;
2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515
    Error *local_err = NULL;
    int flags;
    int64_t size;
    int ret;

    if (!has_speed) {
        speed = 0;
    }
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }

2516 2517
    blk = blk_by_name(device);
    if (!blk) {
2518 2519
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
2520 2521 2522
        return;
    }

M
Max Reitz 已提交
2523
    aio_context = blk_get_aio_context(blk);
2524 2525
    aio_context_acquire(aio_context);

F
Fam Zheng 已提交
2526 2527
    /* Although backup_run has this check too, we need to use bs->drv below, so
     * do an early check redundantly. */
M
Max Reitz 已提交
2528
    if (!blk_is_available(blk)) {
2529
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2530
        goto out;
2531
    }
M
Max Reitz 已提交
2532
    bs = blk_bs(blk);
2533 2534 2535 2536 2537

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }

F
Fam Zheng 已提交
2538
    /* Early check to avoid creating target */
2539
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2540
        goto out;
2541 2542 2543 2544
    }

    flags = bs->open_flags | BDRV_O_RDWR;

2545 2546 2547
    /* See if we have a backing HD we can use to create our new image
     * on top of. */
    if (sync == MIRROR_SYNC_MODE_TOP) {
2548
        source = backing_bs(bs);
2549 2550 2551 2552 2553 2554 2555 2556
        if (!source) {
            sync = MIRROR_SYNC_MODE_FULL;
        }
    }
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }

2557 2558 2559
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2560
        goto out;
2561 2562 2563
    }

    if (mode != NEW_IMAGE_MODE_EXISTING) {
2564
        assert(format);
2565 2566 2567 2568 2569 2570 2571 2572
        if (source) {
            bdrv_img_create(target, format, source->filename,
                            source->drv->format_name, NULL,
                            size, flags, &local_err, false);
        } else {
            bdrv_img_create(target, format, NULL, NULL, NULL,
                            size, flags, &local_err, false);
        }
2573 2574
    }

2575
    if (local_err) {
2576
        error_propagate(errp, local_err);
2577
        goto out;
2578 2579
    }

2580 2581 2582 2583 2584
    if (format) {
        options = qdict_new();
        qdict_put(options, "driver", qstring_from_str(format));
    }

2585
    target_bs = NULL;
2586
    ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2587
    if (ret < 0) {
2588
        error_propagate(errp, local_err);
2589
        goto out;
2590 2591
    }

2592 2593
    bdrv_set_aio_context(target_bs, aio_context);

2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
    if (has_bitmap) {
        bmap = bdrv_find_dirty_bitmap(bs, bitmap);
        if (!bmap) {
            error_setg(errp, "Bitmap '%s' could not be found", bitmap);
            goto out;
        }
    }

    backup_start(bs, target_bs, speed, sync, bmap,
                 on_source_error, on_target_error,
2604 2605
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
F
Fam Zheng 已提交
2606
        bdrv_unref(target_bs);
2607
        error_propagate(errp, local_err);
2608
        goto out;
2609
    }
2610 2611 2612

out:
    aio_context_release(aio_context);
2613 2614
}

2615 2616
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
2617
    return bdrv_named_nodes_list(errp);
2618 2619
}

F
Fam Zheng 已提交
2620 2621 2622 2623 2624 2625 2626 2627 2628
void qmp_blockdev_backup(const char *device, const char *target,
                         enum MirrorSyncMode sync,
                         bool has_speed, int64_t speed,
                         bool has_on_source_error,
                         BlockdevOnError on_source_error,
                         bool has_on_target_error,
                         BlockdevOnError on_target_error,
                         Error **errp)
{
M
Max Reitz 已提交
2629
    BlockBackend *blk, *target_blk;
F
Fam Zheng 已提交
2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    Error *local_err = NULL;
    AioContext *aio_context;

    if (!has_speed) {
        speed = 0;
    }
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }

2645 2646
    blk = blk_by_name(device);
    if (!blk) {
2647
        error_setg(errp, "Device '%s' not found", device);
F
Fam Zheng 已提交
2648 2649 2650
        return;
    }

M
Max Reitz 已提交
2651
    aio_context = blk_get_aio_context(blk);
F
Fam Zheng 已提交
2652 2653
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2654 2655 2656 2657 2658 2659 2660 2661
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

    target_blk = blk_by_name(target);
    if (!target_blk) {
2662
        error_setg(errp, "Device '%s' not found", target);
F
Fam Zheng 已提交
2663 2664
        goto out;
    }
M
Max Reitz 已提交
2665 2666 2667 2668 2669 2670

    if (!blk_is_available(target_blk)) {
        error_setg(errp, "Device '%s' has no medium", target);
        goto out;
    }
    target_bs = blk_bs(target_blk);
F
Fam Zheng 已提交
2671 2672 2673

    bdrv_ref(target_bs);
    bdrv_set_aio_context(target_bs, aio_context);
2674 2675
    backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
                 on_target_error, block_job_cb, bs, &local_err);
F
Fam Zheng 已提交
2676 2677 2678 2679 2680 2681 2682 2683
    if (local_err != NULL) {
        bdrv_unref(target_bs);
        error_propagate(errp, local_err);
    }
out:
    aio_context_release(aio_context);
}

P
Paolo Bonzini 已提交
2684 2685
void qmp_drive_mirror(const char *device, const char *target,
                      bool has_format, const char *format,
2686
                      bool has_node_name, const char *node_name,
2687
                      bool has_replaces, const char *replaces,
P
Paolo Bonzini 已提交
2688 2689
                      enum MirrorSyncMode sync,
                      bool has_mode, enum NewImageMode mode,
2690
                      bool has_speed, int64_t speed,
2691
                      bool has_granularity, uint32_t granularity,
2692
                      bool has_buf_size, int64_t buf_size,
2693 2694
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
2695
                      bool has_unmap, bool unmap,
2696
                      Error **errp)
P
Paolo Bonzini 已提交
2697
{
2698
    BlockBackend *blk;
P
Paolo Bonzini 已提交
2699 2700
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
2701
    AioContext *aio_context;
P
Paolo Bonzini 已提交
2702
    Error *local_err = NULL;
2703
    QDict *options;
P
Paolo Bonzini 已提交
2704
    int flags;
2705
    int64_t size;
P
Paolo Bonzini 已提交
2706 2707 2708 2709 2710
    int ret;

    if (!has_speed) {
        speed = 0;
    }
2711 2712 2713 2714 2715 2716
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
P
Paolo Bonzini 已提交
2717 2718 2719
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
2720 2721 2722
    if (!has_granularity) {
        granularity = 0;
    }
2723
    if (!has_buf_size) {
W
Wen Congyang 已提交
2724
        buf_size = 0;
2725
    }
2726 2727 2728
    if (!has_unmap) {
        unmap = true;
    }
2729

2730
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2731 2732
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "a value in range [512B, 64MB]");
2733 2734 2735
        return;
    }
    if (granularity & (granularity - 1)) {
2736 2737
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "power of 2");
2738 2739
        return;
    }
P
Paolo Bonzini 已提交
2740

2741 2742
    blk = blk_by_name(device);
    if (!blk) {
2743 2744
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
P
Paolo Bonzini 已提交
2745 2746 2747
        return;
    }

M
Max Reitz 已提交
2748
    aio_context = blk_get_aio_context(blk);
2749 2750
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2751
    if (!blk_is_available(blk)) {
2752
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2753
        goto out;
P
Paolo Bonzini 已提交
2754
    }
M
Max Reitz 已提交
2755
    bs = blk_bs(blk);
P
Paolo Bonzini 已提交
2756 2757 2758 2759 2760

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }

2761
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2762
        goto out;
P
Paolo Bonzini 已提交
2763 2764 2765
    }

    flags = bs->open_flags | BDRV_O_RDWR;
2766
    source = backing_bs(bs);
P
Paolo Bonzini 已提交
2767 2768 2769
    if (!source && sync == MIRROR_SYNC_MODE_TOP) {
        sync = MIRROR_SYNC_MODE_FULL;
    }
2770 2771 2772
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }
P
Paolo Bonzini 已提交
2773

2774 2775 2776
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2777
        goto out;
2778 2779
    }

2780 2781
    if (has_replaces) {
        BlockDriverState *to_replace_bs;
2782 2783
        AioContext *replace_aio_context;
        int64_t replace_size;
2784 2785 2786 2787

        if (!has_node_name) {
            error_setg(errp, "a node-name must be provided when replacing a"
                             " named node of the graph");
2788
            goto out;
2789 2790
        }

2791
        to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
2792 2793 2794

        if (!to_replace_bs) {
            error_propagate(errp, local_err);
2795
            goto out;
2796 2797
        }

2798 2799 2800 2801 2802 2803
        replace_aio_context = bdrv_get_aio_context(to_replace_bs);
        aio_context_acquire(replace_aio_context);
        replace_size = bdrv_getlength(to_replace_bs);
        aio_context_release(replace_aio_context);

        if (size != replace_size) {
2804 2805
            error_setg(errp, "cannot replace image with a mirror image of "
                             "different size");
2806
            goto out;
2807 2808 2809
        }
    }

2810 2811 2812
    if ((sync == MIRROR_SYNC_MODE_FULL || !source)
        && mode != NEW_IMAGE_MODE_EXISTING)
    {
P
Paolo Bonzini 已提交
2813
        /* create new image w/o backing file */
2814
        assert(format);
2815
        bdrv_img_create(target, format,
2816
                        NULL, NULL, NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2817 2818 2819 2820 2821 2822
    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
2823 2824 2825
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
2826
                            NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2827 2828 2829 2830 2831 2832
            break;
        default:
            abort();
        }
    }

2833
    if (local_err) {
2834
        error_propagate(errp, local_err);
2835
        goto out;
P
Paolo Bonzini 已提交
2836 2837
    }

2838
    options = qdict_new();
2839 2840 2841
    if (has_node_name) {
        qdict_put(options, "node-name", qstring_from_str(node_name));
    }
2842 2843 2844
    if (format) {
        qdict_put(options, "driver", qstring_from_str(format));
    }
2845

2846 2847 2848
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
2849
    target_bs = NULL;
2850
    ret = bdrv_open(&target_bs, target, NULL, options,
2851
                    flags | BDRV_O_NO_BACKING, &local_err);
P
Paolo Bonzini 已提交
2852
    if (ret < 0) {
2853
        error_propagate(errp, local_err);
2854
        goto out;
P
Paolo Bonzini 已提交
2855 2856
    }

2857 2858
    bdrv_set_aio_context(target_bs, aio_context);

2859 2860 2861 2862 2863 2864
    /* pass the node name to replace to mirror start since it's loose coupling
     * and will allow to check whether the node still exist at mirror completion
     */
    mirror_start(bs, target_bs,
                 has_replaces ? replaces : NULL,
                 speed, granularity, buf_size, sync,
2865
                 on_source_error, on_target_error,
2866
                 unmap,
2867
                 block_job_cb, bs, &local_err);
P
Paolo Bonzini 已提交
2868
    if (local_err != NULL) {
F
Fam Zheng 已提交
2869
        bdrv_unref(target_bs);
P
Paolo Bonzini 已提交
2870
        error_propagate(errp, local_err);
2871
        goto out;
P
Paolo Bonzini 已提交
2872
    }
2873 2874 2875

out:
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
2876 2877
}

2878
/* Get the block job for a given device name and acquire its AioContext */
2879 2880
static BlockJob *find_block_job(const char *device, AioContext **aio_context,
                                Error **errp)
2881
{
2882
    BlockBackend *blk;
2883 2884
    BlockDriverState *bs;

M
Max Reitz 已提交
2885 2886
    *aio_context = NULL;

2887 2888
    blk = blk_by_name(device);
    if (!blk) {
2889 2890 2891
        goto notfound;
    }

M
Max Reitz 已提交
2892
    *aio_context = blk_get_aio_context(blk);
2893 2894
    aio_context_acquire(*aio_context);

M
Max Reitz 已提交
2895 2896 2897 2898 2899
    if (!blk_is_available(blk)) {
        goto notfound;
    }
    bs = blk_bs(blk);

2900 2901
    if (!bs->job) {
        goto notfound;
2902
    }
2903

2904
    return bs->job;
2905 2906

notfound:
2907 2908
    error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
              "No active block job on device '%s'", device);
M
Max Reitz 已提交
2909 2910 2911 2912
    if (*aio_context) {
        aio_context_release(*aio_context);
        *aio_context = NULL;
    }
2913
    return NULL;
2914 2915
}

2916
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2917
{
2918
    AioContext *aio_context;
2919
    BlockJob *job = find_block_job(device, &aio_context, errp);
2920 2921 2922 2923 2924

    if (!job) {
        return;
    }

2925
    block_job_set_speed(job, speed, errp);
2926
    aio_context_release(aio_context);
2927
}
2928

2929 2930
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
2931
{
2932
    AioContext *aio_context;
2933
    BlockJob *job = find_block_job(device, &aio_context, errp);
2934

2935 2936 2937
    if (!job) {
        return;
    }
2938 2939 2940 2941 2942

    if (!has_force) {
        force = false;
    }

F
Fam Zheng 已提交
2943
    if (job->user_paused && !force) {
2944 2945
        error_setg(errp, "The block job for device '%s' is currently paused",
                   device);
2946
        goto out;
2947
    }
2948 2949 2950

    trace_qmp_block_job_cancel(job);
    block_job_cancel(job);
2951 2952
out:
    aio_context_release(aio_context);
2953
}
S
Stefan Hajnoczi 已提交
2954

2955 2956
void qmp_block_job_pause(const char *device, Error **errp)
{
2957
    AioContext *aio_context;
2958
    BlockJob *job = find_block_job(device, &aio_context, errp);
2959

F
Fam Zheng 已提交
2960
    if (!job || job->user_paused) {
2961 2962 2963
        return;
    }

F
Fam Zheng 已提交
2964
    job->user_paused = true;
2965 2966
    trace_qmp_block_job_pause(job);
    block_job_pause(job);
2967
    aio_context_release(aio_context);
2968 2969 2970 2971
}

void qmp_block_job_resume(const char *device, Error **errp)
{
2972
    AioContext *aio_context;
2973
    BlockJob *job = find_block_job(device, &aio_context, errp);
2974

F
Fam Zheng 已提交
2975
    if (!job || !job->user_paused) {
2976 2977 2978
        return;
    }

F
Fam Zheng 已提交
2979
    job->user_paused = false;
2980 2981
    trace_qmp_block_job_resume(job);
    block_job_resume(job);
2982
    aio_context_release(aio_context);
2983 2984
}

P
Paolo Bonzini 已提交
2985 2986
void qmp_block_job_complete(const char *device, Error **errp)
{
2987
    AioContext *aio_context;
2988
    BlockJob *job = find_block_job(device, &aio_context, errp);
P
Paolo Bonzini 已提交
2989 2990 2991 2992 2993 2994 2995

    if (!job) {
        return;
    }

    trace_qmp_block_job_complete(job);
    block_job_complete(job, errp);
2996
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
2997 2998
}

2999 3000 3001 3002 3003
void qmp_change_backing_file(const char *device,
                             const char *image_node_name,
                             const char *backing_file,
                             Error **errp)
{
3004
    BlockBackend *blk;
3005
    BlockDriverState *bs = NULL;
3006
    AioContext *aio_context;
3007 3008 3009 3010 3011 3012
    BlockDriverState *image_bs = NULL;
    Error *local_err = NULL;
    bool ro;
    int open_flags;
    int ret;

3013 3014
    blk = blk_by_name(device);
    if (!blk) {
3015 3016
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
3017 3018 3019
        return;
    }

M
Max Reitz 已提交
3020
    aio_context = blk_get_aio_context(blk);
3021 3022
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
3023 3024 3025 3026 3027 3028
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

3029 3030 3031
    image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
3032
        goto out;
3033 3034 3035 3036
    }

    if (!image_bs) {
        error_setg(errp, "image file not found");
3037
        goto out;
3038 3039 3040 3041 3042
    }

    if (bdrv_find_base(image_bs) == image_bs) {
        error_setg(errp, "not allowing backing file change on an image "
                         "without a backing file");
3043
        goto out;
3044 3045 3046 3047 3048
    }

    /* even though we are not necessarily operating on bs, we need it to
     * determine if block ops are currently prohibited on the chain */
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3049
        goto out;
3050 3051 3052 3053 3054 3055
    }

    /* final sanity check */
    if (!bdrv_chain_contains(bs, image_bs)) {
        error_setg(errp, "'%s' and image file are not in the same chain",
                   device);
3056
        goto out;
3057 3058 3059 3060 3061 3062 3063 3064 3065 3066
    }

    /* if not r/w, reopen to make r/w */
    open_flags = image_bs->open_flags;
    ro = bdrv_is_read_only(image_bs);

    if (ro) {
        bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
3067
            goto out;
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086
        }
    }

    ret = bdrv_change_backing_file(image_bs, backing_file,
                               image_bs->drv ? image_bs->drv->format_name : "");

    if (ret < 0) {
        error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
                         backing_file);
        /* don't exit here, so we can try to restore open flags if
         * appropriate */
    }

    if (ro) {
        bdrv_reopen(image_bs, open_flags, &local_err);
        if (local_err) {
            error_propagate(errp, local_err); /* will preserve prior errp */
        }
    }
3087 3088 3089

out:
    aio_context_release(aio_context);
3090 3091
}

K
Kevin Wolf 已提交
3092 3093 3094
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
    QmpOutputVisitor *ov = qmp_output_visitor_new();
3095 3096
    BlockDriverState *bs;
    BlockBackend *blk = NULL;
K
Kevin Wolf 已提交
3097 3098 3099 3100
    QObject *obj;
    QDict *qdict;
    Error *local_err = NULL;

3101
    /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
K
Kevin Wolf 已提交
3102
     * cache.direct=false instead of silently switching to aio=threads, except
3103
     * when called from drive_new().
K
Kevin Wolf 已提交
3104 3105 3106
     *
     * For now, simply forbidding the combination for all drivers will do. */
    if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3107 3108 3109 3110
        bool direct = options->has_cache &&
                      options->cache->has_direct &&
                      options->cache->direct;
        if (!direct) {
K
Kevin Wolf 已提交
3111 3112 3113 3114 3115 3116 3117
            error_setg(errp, "aio=native requires cache.direct=true");
            goto fail;
        }
    }

    visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
                               &options, NULL, &local_err);
3118
    if (local_err) {
K
Kevin Wolf 已提交
3119 3120 3121 3122 3123 3124 3125 3126 3127
        error_propagate(errp, local_err);
        goto fail;
    }

    obj = qmp_output_get_qobject(ov);
    qdict = qobject_to_qdict(obj);

    qdict_flatten(qdict);

3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150
    if (options->has_id) {
        blk = blockdev_init(NULL, qdict, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            goto fail;
        }

        bs = blk_bs(blk);
    } else {
        int ret;

        if (!qdict_get_try_str(qdict, "node-name")) {
            error_setg(errp, "'id' and/or 'node-name' need to be specified for "
                       "the root node");
            goto fail;
        }

        bs = NULL;
        ret = bdrv_open(&bs, NULL, NULL, qdict, BDRV_O_RDWR | BDRV_O_CACHE_WB,
                        errp);
        if (ret < 0) {
            goto fail;
        }
K
Kevin Wolf 已提交
3151 3152
    }

3153 3154 3155 3156 3157 3158
    if (bs && bdrv_key_required(bs)) {
        if (blk) {
            blk_unref(blk);
        } else {
            bdrv_unref(bs);
        }
3159 3160 3161 3162
        error_setg(errp, "blockdev-add doesn't support encrypted devices");
        goto fail;
    }

K
Kevin Wolf 已提交
3163 3164 3165 3166
fail:
    qmp_output_visitor_cleanup(ov);
}

3167
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
S
Stefan Hajnoczi 已提交
3168
{
3169 3170
    BlockJobInfoList *head = NULL, **p_next = &head;
    BlockDriverState *bs;
S
Stefan Hajnoczi 已提交
3171

3172
    for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3173 3174 3175 3176
        AioContext *aio_context = bdrv_get_aio_context(bs);

        aio_context_acquire(aio_context);

3177 3178 3179 3180 3181 3182
        if (bs->job) {
            BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
            elem->value = block_job_query(bs->job);
            *p_next = elem;
            p_next = &elem->next;
        }
3183 3184

        aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
3185 3186
    }

3187
    return head;
S
Stefan Hajnoczi 已提交
3188
}
3189

3190
QemuOptsList qemu_common_drive_opts = {
3191
    .name = "drive",
3192
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3193 3194 3195 3196 3197
    .desc = {
        {
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
3198 3199 3200 3201
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
3202
        },{
3203
            .name = BDRV_OPT_CACHE_WB,
K
Kevin Wolf 已提交
3204 3205 3206
            .type = QEMU_OPT_BOOL,
            .help = "enables writeback mode for any caches",
        },{
3207
            .name = BDRV_OPT_CACHE_DIRECT,
K
Kevin Wolf 已提交
3208 3209 3210
            .type = QEMU_OPT_BOOL,
            .help = "enables use of O_DIRECT (bypass the host page cache)",
        },{
3211
            .name = BDRV_OPT_CACHE_NO_FLUSH,
K
Kevin Wolf 已提交
3212 3213
            .type = QEMU_OPT_BOOL,
            .help = "ignore any flush requests for the device",
3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230
        },{
            .name = "aio",
            .type = QEMU_OPT_STRING,
            .help = "host AIO implementation (threads, native)",
        },{
            .name = "format",
            .type = QEMU_OPT_STRING,
            .help = "disk format (raw, qcow2, ...)",
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
        },{
3231
            .name = "read-only",
3232 3233 3234
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
3235
            .name = "throttling.iops-total",
3236 3237 3238
            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
3239
            .name = "throttling.iops-read",
3240 3241 3242
            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
3243
            .name = "throttling.iops-write",
3244 3245 3246
            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
3247
            .name = "throttling.bps-total",
3248 3249 3250
            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
3251
            .name = "throttling.bps-read",
3252 3253 3254
            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
3255
            .name = "throttling.bps-write",
3256 3257
            .type = QEMU_OPT_NUMBER,
            .help = "limit write bytes per second",
3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281
        },{
            .name = "throttling.iops-total-max",
            .type = QEMU_OPT_NUMBER,
            .help = "I/O operations burst",
        },{
            .name = "throttling.iops-read-max",
            .type = QEMU_OPT_NUMBER,
            .help = "I/O operations read burst",
        },{
            .name = "throttling.iops-write-max",
            .type = QEMU_OPT_NUMBER,
            .help = "I/O operations write burst",
        },{
            .name = "throttling.bps-total-max",
            .type = QEMU_OPT_NUMBER,
            .help = "total bytes burst",
        },{
            .name = "throttling.bps-read-max",
            .type = QEMU_OPT_NUMBER,
            .help = "total bytes read burst",
        },{
            .name = "throttling.bps-write-max",
            .type = QEMU_OPT_NUMBER,
            .help = "total bytes write burst",
3282 3283 3284 3285
        },{
            .name = "throttling.iops-size",
            .type = QEMU_OPT_NUMBER,
            .help = "when limiting by iops max size of an I/O in bytes",
3286 3287 3288 3289
        },{
            .name = "throttling.group",
            .type = QEMU_OPT_STRING,
            .help = "name of the block throttling group",
3290 3291 3292 3293
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
3294 3295 3296 3297
        },{
            .name = "detect-zeroes",
            .type = QEMU_OPT_STRING,
            .help = "try to optimize zero writes (off, on, unmap)",
3298 3299 3300 3301
        },
        { /* end of list */ }
    },
};
3302 3303 3304 3305 3306

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
3307 3308 3309 3310
        /*
         * no elements => accept any params
         * validation will happen later
         */
3311 3312 3313
        { /* end of list */ }
    },
};