blockdev.c 129.0 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
 */

P
Peter Maydell 已提交
33
#include "qemu/osdep.h"
34
#include "sysemu/block-backend.h"
35
#include "sysemu/blockdev.h"
36
#include "hw/block/block.h"
37
#include "block/blockjob.h"
38
#include "block/qdict.h"
39
#include "block/throttle-groups.h"
40
#include "monitor/monitor.h"
41
#include "qemu/error-report.h"
42 43
#include "qemu/option.h"
#include "qemu/config-file.h"
44 45 46
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-transaction.h"
#include "qapi/qapi-visit-block-core.h"
47
#include "qapi/qmp/qdict.h"
48
#include "qapi/qmp/qnum.h"
49
#include "qapi/qmp/qstring.h"
50
#include "qapi/error.h"
51
#include "qapi/qmp/qerror.h"
52
#include "qapi/qmp/qlist.h"
53
#include "qapi/qobject-output-visitor.h"
54
#include "sysemu/sysemu.h"
55
#include "sysemu/iothread.h"
56
#include "block/block_int.h"
57
#include "block/trace.h"
58
#include "sysemu/arch_init.h"
59
#include "sysemu/qtest.h"
60 61
#include "qemu/cutils.h"
#include "qemu/help_option.h"
62
#include "qemu/throttle-options.h"
63

64 65 66
static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
    QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);

67 68
static int do_open_tray(const char *blk_name, const char *qdev_id,
                        bool force, Error **errp);
69 70 71 72 73
static void blockdev_remove_medium(bool has_device, const char *device,
                                   bool has_id, const char *id, Error **errp);
static void blockdev_insert_medium(bool has_device, const char *device,
                                   bool has_id, const char *id,
                                   const char *node_name, Error **errp);
74

75 76 77 78 79 80 81 82 83 84 85 86
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",
};

87
static int if_max_devs[IF_COUNT] = {
88 89 90 91
    /*
     * Do not change these numbers!  They govern how drive option
     * index maps to unit and bus.  That mapping is ABI.
     *
92
     * All controllers used to implement if=T drives need to support
93 94 95 96 97 98 99 100 101 102 103
     * 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,
104 105
};

106 107 108 109 110 111
/**
 * Boards may call this to offer board-by-board overrides
 * of the default, global values.
 */
void override_max_devs(BlockInterfaceType type, int max_devs)
{
112
    BlockBackend *blk;
113 114 115 116 117 118
    DriveInfo *dinfo;

    if (max_devs <= 0) {
        return;
    }

119 120
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
121 122 123 124 125 126 127 128 129 130 131
        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;
}

132 133 134 135 136 137 138
/*
 * 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.
 */
139
void blockdev_mark_auto_del(BlockBackend *blk)
140
{
141
    DriveInfo *dinfo = blk_legacy_dinfo(blk);
142
    BlockDriverState *bs = blk_bs(blk);
143
    AioContext *aio_context;
144

145
    if (!dinfo) {
146 147 148
        return;
    }

M
Max Reitz 已提交
149 150 151
    if (bs) {
        aio_context = bdrv_get_aio_context(bs);
        aio_context_acquire(aio_context);
152

M
Max Reitz 已提交
153
        if (bs->job) {
154
            job_cancel(&bs->job->job, false);
M
Max Reitz 已提交
155
        }
156

M
Max Reitz 已提交
157 158
        aio_context_release(aio_context);
    }
159

160
    dinfo->auto_del = 1;
161 162
}

163
void blockdev_auto_del(BlockBackend *blk)
164
{
165
    DriveInfo *dinfo = blk_legacy_dinfo(blk);
166

167
    if (dinfo && dinfo->auto_del) {
168
        monitor_remove_blk(blk);
169
        blk_unref(blk);
170 171 172
    }
}

173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
/**
 * 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;
}

190 191 192 193 194 195 196 197 198 199 200 201
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;
}

202 203
QemuOpts *drive_def(const char *optstr)
{
204
    return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
205 206 207
}

QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
208
                    const char *optstr)
209 210 211
{
    QemuOpts *opts;

212
    opts = drive_def(optstr);
213 214 215
    if (!opts) {
        return NULL;
    }
216
    if (type != IF_DEFAULT) {
217
        qemu_opt_set(opts, "if", if_name[type], &error_abort);
218 219
    }
    if (index >= 0) {
220
        qemu_opt_set_number(opts, "index", index, &error_abort);
221
    }
222
    if (file)
223
        qemu_opt_set(opts, "file", file, &error_abort);
224 225 226 227 228
    return opts;
}

DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
229
    BlockBackend *blk;
230 231
    DriveInfo *dinfo;

232 233 234 235
    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) {
236
            return dinfo;
237
        }
238 239 240 241 242
    }

    return NULL;
}

243
void drive_check_orphaned(void)
244
{
245
    BlockBackend *blk;
246
    DriveInfo *dinfo;
247
    Location loc;
248
    bool orphans = false;
249

250 251
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
252
        if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
253
            dinfo->type != IF_NONE) {
254 255
            loc_push_none(&loc);
            qemu_opts_loc_restore(dinfo->opts);
256
            error_report("machine type does not support"
257 258 259
                         " if=%s,bus=%d,unit=%d",
                         if_name[dinfo->type], dinfo->bus, dinfo->unit);
            loc_pop(&loc);
260
            orphans = true;
261 262 263
        }
    }

264 265 266
    if (orphans) {
        exit(1);
    }
267 268
}

269 270 271 272 273 274 275
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));
}

276 277 278
int drive_get_max_bus(BlockInterfaceType type)
{
    int max_bus;
279
    BlockBackend *blk;
280 281 282
    DriveInfo *dinfo;

    max_bus = -1;
283 284 285
    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
        if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
286
            max_bus = dinfo->bus;
287
        }
288 289 290 291
    }
    return max_bus;
}

292 293 294 295 296 297 298 299 300 301
/* 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]++);
}

302 303
static void bdrv_format_print(void *opaque, const char *name)
{
304
    error_printf(" %s", name);
305 306
}

307 308
typedef struct {
    QEMUBH *bh;
309 310
    BlockDriverState *bs;
} BDRVPutRefBH;
311

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;
    }
}

329 330 331 332 333 334 335 336 337
static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
                                  Error **errp)
{
    const QListEntry *entry;
    for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
        switch (qobject_type(entry->value)) {

        case QTYPE_QSTRING: {
            unsigned long long length;
338 339
            const char *str = qstring_get_str(qobject_to(QString,
                                                         entry->value));
340 341 342 343 344 345 346 347 348 349
            if (parse_uint_full(str, &length, 10) == 0 &&
                length > 0 && length <= UINT_MAX) {
                block_acct_add_interval(stats, (unsigned) length);
            } else {
                error_setg(errp, "Invalid interval length: %s", str);
                return false;
            }
            break;
        }

350
        case QTYPE_QNUM: {
351
            int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
352

353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
            if (length > 0 && length <= UINT_MAX) {
                block_acct_add_interval(stats, (unsigned) length);
            } else {
                error_setg(errp, "Invalid interval length: %" PRId64, length);
                return false;
            }
            break;
        }

        default:
            error_setg(errp, "The specification of stats-intervals is invalid");
            return false;
        }
    }
    return true;
}

370 371
typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;

372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402
/* All parameters but @opts are optional and may be set to NULL. */
static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
    const char **throttling_group, ThrottleConfig *throttle_cfg,
    BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
{
    Error *local_error = NULL;
    const char *aio;

    if (bdrv_flags) {
        if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
            *bdrv_flags |= BDRV_O_COPY_ON_READ;
        }

        if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
            if (!strcmp(aio, "native")) {
                *bdrv_flags |= BDRV_O_NATIVE_AIO;
            } else if (!strcmp(aio, "threads")) {
                /* this is the default */
            } else {
               error_setg(errp, "invalid aio option");
               return;
            }
        }
    }

    /* disk I/O throttling */
    if (throttling_group) {
        *throttling_group = qemu_opt_get(opts, "throttling.group");
    }

    if (throttle_cfg) {
403
        throttle_config_init(throttle_cfg);
404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
            qemu_opt_get_number(opts, "throttling.bps-total", 0);
        throttle_cfg->buckets[THROTTLE_BPS_READ].avg  =
            qemu_opt_get_number(opts, "throttling.bps-read", 0);
        throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
            qemu_opt_get_number(opts, "throttling.bps-write", 0);
        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
            qemu_opt_get_number(opts, "throttling.iops-total", 0);
        throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
            qemu_opt_get_number(opts, "throttling.iops-read", 0);
        throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
            qemu_opt_get_number(opts, "throttling.iops-write", 0);

        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
            qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
        throttle_cfg->buckets[THROTTLE_BPS_READ].max  =
            qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
        throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
            qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
            qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
        throttle_cfg->buckets[THROTTLE_OPS_READ].max =
            qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
        throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
            qemu_opt_get_number(opts, "throttling.iops-write-max", 0);

430 431 432 433 434 435 436 437 438 439 440 441 442
        throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
            qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
        throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length  =
            qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
        throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
            qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
        throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
            qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
        throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
            qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
        throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
            qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);

443 444 445
        throttle_cfg->op_size =
            qemu_opt_get_number(opts, "throttling.iops-size", 0);

446
        if (!throttle_is_valid(throttle_cfg, errp)) {
447 448 449 450 451 452
            return;
        }
    }

    if (detect_zeroes) {
        *detect_zeroes =
453
            qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
454 455 456 457 458 459 460 461 462 463
                            qemu_opt_get(opts, "detect-zeroes"),
                            BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
                            &local_error);
        if (local_error) {
            error_propagate(errp, local_error);
            return;
        }
    }
}

464
/* Takes the ownership of bs_opts */
465 466
static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
                                   Error **errp)
467 468 469 470
{
    const char *buf;
    int bdrv_flags = 0;
    int on_read_error, on_write_error;
471
    bool account_invalid, account_failed;
472
    bool writethrough, read_only;
473
    BlockBackend *blk;
474
    BlockDriverState *bs;
475
    ThrottleConfig cfg;
476
    int snapshot = 0;
477
    Error *error = NULL;
478
    QemuOpts *opts;
479 480
    QDict *interval_dict = NULL;
    QList *interval_list = NULL;
481
    const char *id;
482 483 484
    BlockdevDetectZeroesOptions detect_zeroes =
        BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
    const char *throttling_group = NULL;
485

486 487 488
    /* 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");
489
    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
490
    if (error) {
491
        error_propagate(errp, error);
492
        goto err_no_opts;
493 494 495
    }

    qemu_opts_absorb_qdict(opts, bs_opts, &error);
496
    if (error) {
497
        error_propagate(errp, error);
498
        goto early_err;
499 500 501 502 503 504
    }

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

505 506 507
    /* extract parameters */
    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);

508 509 510
    account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
    account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);

511 512
    writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);

513 514
    id = qemu_opts_id(opts);

515 516 517 518 519 520 521 522
    qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
    qdict_array_split(interval_dict, &interval_list);

    if (qdict_size(interval_dict) != 0) {
        error_setg(errp, "Invalid option stats-intervals.%s",
                   qdict_first(interval_dict)->key);
        goto early_err;
    }
523

524 525 526 527 528
    extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
                                    &detect_zeroes, &error);
    if (error) {
        error_propagate(errp, error);
        goto early_err;
529 530 531
    }

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
532 533 534 535
        if (is_help_option(buf)) {
            error_printf("Supported formats:");
            bdrv_iterate_format(bdrv_format_print, NULL);
            error_printf("\n");
536
            goto early_err;
537
        }
538

539 540
        if (qdict_haskey(bs_opts, "driver")) {
            error_setg(errp, "Cannot specify both 'driver' and 'format'");
541
            goto early_err;
542
        }
543
        qdict_put_str(bs_opts, "driver", buf);
544 545
    }

546
    on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
547
    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
548
        on_write_error = parse_block_error_action(buf, 0, &error);
549
        if (error) {
550
            error_propagate(errp, error);
551
            goto early_err;
552 553 554
        }
    }

555
    on_read_error = BLOCKDEV_ON_ERROR_REPORT;
556
    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
557
        on_read_error = parse_block_error_action(buf, 1, &error);
558
        if (error) {
559
            error_propagate(errp, error);
560
            goto early_err;
561 562 563
        }
    }

564
    if (snapshot) {
565
        bdrv_flags |= BDRV_O_SNAPSHOT;
566 567
    }

568 569
    read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);

570
    /* init */
571
    if ((!file || !*file) && !qdict_size(bs_opts)) {
572 573
        BlockBackendRootState *blk_rs;

574
        blk = blk_new(0, BLK_PERM_ALL);
575 576
        blk_rs = blk_get_root_state(blk);
        blk_rs->open_flags    = bdrv_flags;
577
        blk_rs->read_only     = read_only;
578 579
        blk_rs->detect_zeroes = detect_zeroes;

580
        qobject_unref(bs_opts);
581 582
    } else {
        if (file && !*file) {
583 584
            file = NULL;
        }
585

586 587 588 589 590
        /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
         * with other callers) rather than what we want as the real defaults.
         * Apply the defaults here instead. */
        qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
        qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
591 592
        qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
                              read_only ? "on" : "off");
593
        assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
594

595 596 597 598
        if (runstate_check(RUN_STATE_INMIGRATE)) {
            bdrv_flags |= BDRV_O_INACTIVE;
        }

599
        blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
600 601 602 603
        if (!blk) {
            goto err_no_bs_opts;
        }
        bs = blk_bs(blk);
604

605
        bs->detect_zeroes = detect_zeroes;
606

607
        block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
608

609 610 611 612
        if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
            blk_unref(blk);
            blk = NULL;
            goto err_no_bs_opts;
613
        }
614 615
    }

616 617 618
    /* disk I/O throttling */
    if (throttle_enabled(&cfg)) {
        if (!throttling_group) {
619
            throttling_group = id;
620 621 622 623 624
        }
        blk_io_limits_enable(blk, throttling_group);
        blk_set_io_limits(blk, &cfg);
    }

625
    blk_set_enable_write_cache(blk, !writethrough);
626
    blk_set_on_error(blk, on_read_error, on_write_error);
627

628
    if (!monitor_add_blk(blk, id, errp)) {
629 630 631 632 633
        blk_unref(blk);
        blk = NULL;
        goto err_no_bs_opts;
    }

634
err_no_bs_opts:
635
    qemu_opts_del(opts);
636 637
    qobject_unref(interval_dict);
    qobject_unref(interval_list);
638
    return blk;
639

640 641
early_err:
    qemu_opts_del(opts);
642 643
    qobject_unref(interval_dict);
    qobject_unref(interval_list);
644
err_no_opts:
645
    qobject_unref(bs_opts);
646
    return NULL;
647 648
}

649 650 651 652 653
/* Takes the ownership of bs_opts */
static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
{
    int bdrv_flags = 0;

654 655 656 657 658
    /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
     * with other callers) rather than what we want as the real defaults.
     * Apply the defaults here instead. */
    qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
    qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
659
    qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
660

661 662 663 664
    if (runstate_check(RUN_STATE_INMIGRATE)) {
        bdrv_flags |= BDRV_O_INACTIVE;
    }

665
    return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
666 667
}

668 669 670 671 672 673 674 675 676 677 678 679 680
void blockdev_close_all_bdrv_states(void)
{
    BlockDriverState *bs, *next_bs;

    QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
        AioContext *ctx = bdrv_get_aio_context(bs);

        aio_context_acquire(ctx);
        bdrv_unref(bs);
        aio_context_release(ctx);
    }
}

681 682 683 684 685 686 687
/* Iterates over the list of monitor-owned BlockDriverStates */
BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
{
    return bs ? QTAILQ_NEXT(bs, monitor_list)
              : QTAILQ_FIRST(&monitor_bdrv_states);
}

688 689
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
                            Error **errp)
690 691 692 693 694
{
    const char *value;

    value = qemu_opt_get(opts, from);
    if (value) {
695 696 697 698 699
        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;
        }
700 701 702 703
    }

    /* rename all items in opts */
    while ((value = qemu_opt_get(opts, from))) {
704
        qemu_opt_set(opts, to, value, &error_abort);
705 706 707 708
        qemu_opt_unset(opts, from);
    }
}

709 710 711 712 713
QemuOptsList qemu_legacy_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
    .desc = {
        {
714 715 716 717 718 719 720 721 722 723 724 725
            .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",
        },{
726 727 728
            .name = "media",
            .type = QEMU_OPT_STRING,
            .help = "media type (disk, cdrom)",
729 730 731 732
        },{
            .name = "if",
            .type = QEMU_OPT_STRING,
            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
733 734 735 736
        },{
            .name = "serial",
            .type = QEMU_OPT_STRING,
            .help = "disk serial number",
737 738 739 740
        },{
            .name = "file",
            .type = QEMU_OPT_STRING,
            .help = "file name",
741
        },
742 743 744

        /* Options that are passed on, but have special semantics with -drive */
        {
745
            .name = BDRV_OPT_READ_ONLY,
746 747
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
748 749 750 751 752 753 754 755
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
756 757 758 759 760 761
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },

762 763 764 765
        { /* end of list */ }
    },
};

766
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
767
{
768
    const char *value;
769
    BlockBackend *blk;
770
    DriveInfo *dinfo = NULL;
771
    QDict *bs_opts;
772 773
    QemuOpts *legacy_opts;
    DriveMediaType media = MEDIA_DISK;
774
    BlockInterfaceType type;
775
    int max_devs, bus_id, unit_id, index;
776
    const char *werror, *rerror;
777 778
    bool read_only = false;
    bool copy_on_read;
779
    const char *serial;
780
    const char *filename;
781
    Error *local_err = NULL;
782
    int i;
783
    const char *deprecated[] = {
784
        "serial"
785
    };
786

787
    /* Change legacy command line options into QMP ones */
788 789 790 791 792 793 794
    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" },
795

796 797 798
        { "bps",            "throttling.bps-total" },
        { "bps_rd",         "throttling.bps-read" },
        { "bps_wr",         "throttling.bps-write" },
799

800 801 802
        { "iops_max",       "throttling.iops-total-max" },
        { "iops_rd_max",    "throttling.iops-read-max" },
        { "iops_wr_max",    "throttling.iops-write-max" },
803

804 805 806
        { "bps_max",        "throttling.bps-total-max" },
        { "bps_rd_max",     "throttling.bps-read-max" },
        { "bps_wr_max",     "throttling.bps-write-max" },
807

808
        { "iops_size",      "throttling.iops-size" },
809

810 811
        { "group",          "throttling.group" },

812
        { "readonly",       BDRV_OPT_READ_ONLY },
813 814 815
    };

    for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
816 817 818
        qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
                        &local_err);
        if (local_err) {
819
            error_report_err(local_err);
820 821
            return NULL;
        }
822
    }
823

824 825 826
    value = qemu_opt_get(all_opts, "cache");
    if (value) {
        int flags = 0;
827
        bool writethrough;
828

829
        if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
830 831 832 833 834
            error_report("invalid cache option");
            return NULL;
        }

        /* Specific options take precedence */
835 836
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
837
                              !writethrough, &error_abort);
838
        }
839 840
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
841
                              !!(flags & BDRV_O_NOCACHE), &error_abort);
842
        }
843 844
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
845
                              !!(flags & BDRV_O_NO_FLUSH), &error_abort);
846 847 848 849
        }
        qemu_opt_unset(all_opts, "cache");
    }

850 851 852 853
    /* Get a QDict for processing the options */
    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);

854 855
    legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                   &error_abort);
856
    qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
857
    if (local_err) {
858
        error_report_err(local_err);
859 860 861
        goto fail;
    }

862 863 864 865 866 867 868 869 870 871
    /* Other deprecated options */
    if (!qtest_enabled()) {
        for (i = 0; i < ARRAY_SIZE(deprecated); i++) {
            if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) {
                error_report("'%s' is deprecated, please use the corresponding "
                             "option of '-device' instead", deprecated[i]);
            }
        }
    }

872 873 874 875 876 877 878
    /* 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;
879
            read_only = true;
880 881 882 883 884 885
        } else {
            error_report("'%s' invalid media", value);
            goto fail;
        }
    }

886
    /* copy-on-read is disabled with a warning for read-only devices */
887
    read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
888 889 890
    copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);

    if (read_only && copy_on_read) {
891
        warn_report("disabling copy-on-read on read-only drive");
892 893 894
        copy_on_read = false;
    }

895 896
    qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
    qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
897

898 899 900 901 902 903 904 905 906 907 908 909 910 911 912
    /* 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;
    }

913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
    /* 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;
    }

952 953 954
    /* Serial number */
    serial = qemu_opt_get(legacy_opts, "serial");

955 956 957 958 959 960 961 962 963 964 965 966 967 968
    /* 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);
        }
969
        qdict_put_str(bs_opts, "id", new_id);
970 971 972
        g_free(new_id);
    }

973 974 975
    /* Add virtio block device */
    if (type == IF_VIRTIO) {
        QemuOpts *devopts;
976 977
        devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
                                   &error_abort);
978
        if (arch_type == QEMU_ARCH_S390X) {
979
            qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
980
        } else {
981
            qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
982
        }
983 984
        qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
                     &error_abort);
985 986
    }

987 988
    filename = qemu_opt_get(legacy_opts, "file");

989 990 991 992 993 994 995 996
    /* 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;
        }
997
        qdict_put_str(bs_opts, "werror", werror);
998 999 1000 1001 1002 1003 1004 1005 1006
    }

    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;
        }
1007
        qdict_put_str(bs_opts, "rerror", rerror);
1008 1009
    }

1010
    /* Actual block device init: Functionality shared with blockdev-add */
1011
    blk = blockdev_init(filename, bs_opts, &local_err);
1012
    bs_opts = NULL;
1013
    if (!blk) {
1014
        if (local_err) {
1015
            error_report_err(local_err);
1016
        }
1017
        goto fail;
1018
    } else {
1019
        assert(!local_err);
1020 1021
    }

1022 1023
    /* Create legacy DriveInfo */
    dinfo = g_malloc0(sizeof(*dinfo));
1024
    dinfo->opts = all_opts;
1025

1026
    dinfo->type = type;
1027 1028
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
1029
    dinfo->serial = g_strdup(serial);
1030

1031 1032
    blk_set_legacy_dinfo(blk, dinfo);

1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        dinfo->media_cd = media == MEDIA_CDROM;
        break;
    default:
        break;
    }

1044
fail:
1045
    qemu_opts_del(legacy_opts);
1046
    qobject_unref(bs_opts);
1047
    return dinfo;
1048 1049
}

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
{
    BlockDriverState *bs;

    bs = bdrv_lookup_bs(name, name, errp);
    if (bs == NULL) {
        return NULL;
    }

    if (!bdrv_is_root_node(bs)) {
        error_setg(errp, "Need a root block node");
        return NULL;
    }

    if (!bdrv_is_inserted(bs)) {
        error_setg(errp, "Device has no medium");
        return NULL;
    }

    return bs;
}

1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
                                 Error **errp)
{
    BlockBackend *blk;

    if (!blk_name == !qdev_id) {
        error_setg(errp, "Need exactly one of 'device' and 'id'");
        return NULL;
    }

    if (qdev_id) {
        blk = blk_by_qdev_id(qdev_id, errp);
    } else {
        blk = blk_by_name(blk_name);
        if (blk == NULL) {
            error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                      "Device '%s' not found", blk_name);
        }
    }

    return blk;
}

1095
void hmp_commit(Monitor *mon, const QDict *qdict)
1096 1097
{
    const char *device = qdict_get_str(qdict, "device");
1098
    BlockBackend *blk;
1099
    int ret;
1100

1101
    if (!strcmp(device, "all")) {
1102
        ret = blk_commit_all();
1103
    } else {
1104 1105 1106
        BlockDriverState *bs;
        AioContext *aio_context;

1107 1108
        blk = blk_by_name(device);
        if (!blk) {
1109
            monitor_printf(mon, "Device '%s' not found\n", device);
1110
            return;
1111
        }
M
Max Reitz 已提交
1112 1113 1114 1115
        if (!blk_is_available(blk)) {
            monitor_printf(mon, "Device '%s' has no medium\n", device);
            return;
        }
1116 1117 1118 1119 1120 1121 1122 1123

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

        ret = bdrv_commit(bs);

        aio_context_release(aio_context);
1124 1125 1126 1127
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
1128 1129 1130
    }
}

1131
static void blockdev_do_action(TransactionAction *action, Error **errp)
1132
{
1133
    TransactionActionList list;
1134

1135
    list.value = action;
1136
    list.next = NULL;
1137
    qmp_transaction(&list, false, NULL, errp);
1138 1139
}

1140 1141 1142 1143 1144
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,
1145
                                bool has_format, const char *format,
1146
                                bool has_mode, NewImageMode mode, Error **errp)
1147
{
1148
    BlockdevSnapshotSync snapshot = {
1149
        .has_device = has_device,
1150
        .device = (char *) device,
1151 1152
        .has_node_name = has_node_name,
        .node_name = (char *) node_name,
1153
        .snapshot_file = (char *) snapshot_file,
1154 1155
        .has_snapshot_node_name = has_snapshot_node_name,
        .snapshot_node_name = (char *) snapshot_node_name,
1156 1157 1158 1159 1160
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
1161 1162
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1163
        .u.blockdev_snapshot_sync.data = &snapshot,
1164 1165
    };
    blockdev_do_action(&action, errp);
1166 1167
}

1168 1169 1170 1171 1172 1173 1174
void qmp_blockdev_snapshot(const char *node, const char *overlay,
                           Error **errp)
{
    BlockdevSnapshot snapshot_data = {
        .node = (char *) node,
        .overlay = (char *) overlay
    };
1175 1176
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1177
        .u.blockdev_snapshot.data = &snapshot_data,
1178 1179
    };
    blockdev_do_action(&action, errp);
1180 1181
}

1182 1183 1184 1185 1186 1187 1188 1189
void qmp_blockdev_snapshot_internal_sync(const char *device,
                                         const char *name,
                                         Error **errp)
{
    BlockdevSnapshotInternal snapshot = {
        .device = (char *) device,
        .name = (char *) name
    };
1190 1191
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1192
        .u.blockdev_snapshot_internal_sync.data = &snapshot,
1193 1194
    };
    blockdev_do_action(&action, errp);
1195 1196
}

1197 1198 1199 1200 1201 1202 1203
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                         bool has_id,
                                                         const char *id,
                                                         bool has_name,
                                                         const char *name,
                                                         Error **errp)
{
1204
    BlockDriverState *bs;
1205
    AioContext *aio_context;
1206 1207 1208 1209 1210
    QEMUSnapshotInfo sn;
    Error *local_err = NULL;
    SnapshotInfo *info = NULL;
    int ret;

1211 1212
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
1213 1214
        return NULL;
    }
1215
    aio_context = bdrv_get_aio_context(bs);
M
Max Reitz 已提交
1216
    aio_context_acquire(aio_context);
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227

    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
1228
        goto out_aio_context;
1229 1230
    }

1231 1232 1233 1234
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
        goto out_aio_context;
    }

1235
    ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1236
    if (local_err) {
1237
        error_propagate(errp, local_err);
1238
        goto out_aio_context;
1239 1240 1241 1242 1243 1244
    }
    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);
1245
        goto out_aio_context;
1246 1247 1248
    }

    bdrv_snapshot_delete(bs, id, name, &local_err);
1249
    if (local_err) {
1250
        error_propagate(errp, local_err);
1251
        goto out_aio_context;
1252 1253
    }

1254 1255
    aio_context_release(aio_context);

1256
    info = g_new0(SnapshotInfo, 1);
1257 1258 1259 1260 1261 1262 1263 1264 1265
    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;
1266 1267 1268 1269

out_aio_context:
    aio_context_release(aio_context);
    return NULL;
1270
}
1271

1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
/**
 * 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,
                                                  Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;

    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;
    }

    bitmap = bdrv_find_dirty_bitmap(bs, name);
    if (!bitmap) {
        error_setg(errp, "Dirty bitmap '%s' not found", name);
1310
        return NULL;
1311 1312 1313 1314 1315 1316 1317 1318 1319
    }

    if (pbs) {
        *pbs = bs;
    }

    return bitmap;
}

1320
/* New and old BlockDriverState structs for atomic group operations */
1321

1322
typedef struct BlkActionState BlkActionState;
1323

1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
/**
 * BlkActionOps:
 * Table of operations that define an Action.
 *
 * @instance_size: Size of state struct, in bytes.
 * @prepare: Prepare the work, must NOT be NULL.
 * @commit: Commit the changes, can be NULL.
 * @abort: Abort the changes on fail, can be NULL.
 * @clean: Clean up resources after all transaction actions have called
 *         commit() or abort(). Can be NULL.
 *
 * Only prepare() may fail. In a single transaction, only one of commit() or
 * abort() will be called. clean() will always be called if it is present.
 */
typedef struct BlkActionOps {
1339
    size_t instance_size;
1340 1341 1342 1343 1344
    void (*prepare)(BlkActionState *common, Error **errp);
    void (*commit)(BlkActionState *common);
    void (*abort)(BlkActionState *common);
    void (*clean)(BlkActionState *common);
} BlkActionOps;
1345

1346 1347 1348 1349 1350 1351
/**
 * BlkActionState:
 * Describes one Action's state within a Transaction.
 *
 * @action: QAPI-defined enum identifying which Action to perform.
 * @ops: Table of ActionOps this Action can perform.
1352
 * @block_job_txn: Transaction which this action belongs to.
1353 1354 1355 1356 1357
 * @entry: List membership for all Actions in this Transaction.
 *
 * This structure must be arranged as first member in a subclassed type,
 * assuming that the compiler will also arrange it to the same offsets as the
 * base class.
1358
 */
1359
struct BlkActionState {
1360
    TransactionAction *action;
1361
    const BlkActionOps *ops;
1362
    JobTxn *block_job_txn;
1363
    TransactionProperties *txn_props;
1364
    QSIMPLEQ_ENTRY(BlkActionState) entry;
1365 1366
};

1367 1368
/* internal snapshot private data */
typedef struct InternalSnapshotState {
1369
    BlkActionState common;
1370 1371
    BlockDriverState *bs;
    QEMUSnapshotInfo sn;
1372
    bool created;
1373 1374
} InternalSnapshotState;

1375 1376 1377 1378 1379 1380 1381

static int action_check_completion_mode(BlkActionState *s, Error **errp)
{
    if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
        error_setg(errp,
                   "Action '%s' does not support Transaction property "
                   "completion-mode = %s",
1382 1383
                   TransactionActionKind_str(s->action->type),
                   ActionCompletionMode_str(s->txn_props->completion_mode));
1384 1385 1386 1387 1388
        return -1;
    }
    return 0;
}

1389
static void internal_snapshot_prepare(BlkActionState *common,
1390 1391
                                      Error **errp)
{
1392
    Error *local_err = NULL;
1393 1394 1395 1396 1397 1398 1399 1400
    const char *device;
    const char *name;
    BlockDriverState *bs;
    QEMUSnapshotInfo old_sn, *sn;
    bool ret;
    qemu_timeval tv;
    BlockdevSnapshotInternal *internal;
    InternalSnapshotState *state;
1401
    AioContext *aio_context;
1402 1403
    int ret1;

1404
    g_assert(common->action->type ==
1405
             TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1406
    internal = common->action->u.blockdev_snapshot_internal_sync.data;
1407 1408 1409 1410 1411 1412 1413
    state = DO_UPCAST(InternalSnapshotState, common, common);

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

    /* 2. check for validation */
1414 1415 1416 1417
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1418 1419
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
1420 1421 1422
        return;
    }

1423 1424
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);
1425

1426
    state->bs = bs;
1427 1428

    /* Paired with .clean() */
1429 1430
    bdrv_drained_begin(bs);

1431
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1432
        goto out;
1433 1434
    }

1435
    if (bdrv_is_read_only(bs)) {
1436
        error_setg(errp, "Device '%s' is read only", device);
1437
        goto out;
1438 1439 1440
    }

    if (!bdrv_can_snapshot(bs)) {
1441 1442 1443
        error_setg(errp, "Block format '%s' used by device '%s' "
                   "does not support internal snapshots",
                   bs->drv->format_name, device);
1444
        goto out;
1445 1446 1447 1448
    }

    if (!strlen(name)) {
        error_setg(errp, "Name is empty");
1449
        goto out;
1450 1451 1452
    }

    /* check whether a snapshot with name exist */
1453 1454 1455 1456
    ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
                                            &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1457
        goto out;
1458 1459 1460 1461
    } else if (ret) {
        error_setg(errp,
                   "Snapshot with name '%s' already exists on device '%s'",
                   name, device);
1462
        goto out;
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
    }

    /* 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);
1478
        goto out;
1479 1480 1481
    }

    /* 4. succeed, mark a snapshot is created */
1482
    state->created = true;
1483 1484 1485

out:
    aio_context_release(aio_context);
1486 1487
}

1488
static void internal_snapshot_abort(BlkActionState *common)
1489 1490 1491 1492 1493
{
    InternalSnapshotState *state =
                             DO_UPCAST(InternalSnapshotState, common, common);
    BlockDriverState *bs = state->bs;
    QEMUSnapshotInfo *sn = &state->sn;
1494
    AioContext *aio_context;
1495 1496
    Error *local_error = NULL;

1497
    if (!state->created) {
1498 1499 1500
        return;
    }

1501 1502 1503
    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

1504
    if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1505 1506 1507 1508 1509
        error_reportf_err(local_error,
                          "Failed to delete snapshot with id '%s' and "
                          "name '%s' on device '%s' in abort: ",
                          sn->id_str, sn->name,
                          bdrv_get_device_name(bs));
1510
    }
1511 1512

    aio_context_release(aio_context);
1513 1514
}

1515
static void internal_snapshot_clean(BlkActionState *common)
1516 1517 1518
{
    InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
                                             common, common);
1519
    AioContext *aio_context;
1520

1521 1522
    if (!state->bs) {
        return;
1523
    }
1524 1525 1526 1527 1528 1529 1530

    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1531 1532
}

1533
/* external snapshot private data */
1534
typedef struct ExternalSnapshotState {
1535
    BlkActionState common;
1536 1537
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
1538
    bool overlay_appended;
1539
} ExternalSnapshotState;
1540

1541
static void external_snapshot_prepare(BlkActionState *common,
1542 1543
                                      Error **errp)
{
1544
    int flags = 0;
1545
    QDict *options = NULL;
1546
    Error *local_err = NULL;
1547
    /* Device and node name of the image to generate the snapshot from */
1548
    const char *device;
1549
    const char *node_name;
1550 1551 1552
    /* Reference to the new image (for 'blockdev-snapshot') */
    const char *snapshot_ref;
    /* File name of the new image (for 'blockdev-snapshot-sync') */
1553
    const char *new_image_file;
1554 1555
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1556
    TransactionAction *action = common->action;
1557
    AioContext *aio_context;
1558

1559 1560 1561 1562 1563
    /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
     * purpose but a different set of parameters */
    switch (action->type) {
    case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
        {
1564
            BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1565 1566 1567 1568 1569 1570 1571 1572
            device = s->node;
            node_name = s->node;
            new_image_file = NULL;
            snapshot_ref = s->overlay;
        }
        break;
    case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
        {
1573
            BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1574 1575 1576 1577 1578 1579 1580 1581
            device = s->has_device ? s->device : NULL;
            node_name = s->has_node_name ? s->node_name : NULL;
            new_image_file = s->snapshot_file;
            snapshot_ref = NULL;
        }
        break;
    default:
        g_assert_not_reached();
1582 1583 1584
    }

    /* start processing */
1585 1586 1587 1588
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1589 1590
    state->old_bs = bdrv_lookup_bs(device, node_name, errp);
    if (!state->old_bs) {
1591 1592 1593
        return;
    }

1594 1595 1596 1597
    aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(aio_context);

    /* Paired with .clean() */
1598
    bdrv_drained_begin(state->old_bs);
1599

1600
    if (!bdrv_is_inserted(state->old_bs)) {
1601
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1602
        goto out;
1603 1604
    }

1605 1606
    if (bdrv_op_is_blocked(state->old_bs,
                           BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1607
        goto out;
1608 1609
    }

1610 1611
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
1612
            error_setg(errp, QERR_IO_ERROR);
1613
            goto out;
1614 1615 1616
        }
    }

1617
    if (!bdrv_is_first_non_filter(state->old_bs)) {
1618
        error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1619
        goto out;
1620 1621
    }

1622
    if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1623
        BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1624 1625 1626 1627
        const char *format = s->has_format ? s->format : "qcow2";
        enum NewImageMode mode;
        const char *snapshot_node_name =
            s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1628

1629 1630
        if (node_name && !snapshot_node_name) {
            error_setg(errp, "New snapshot node name missing");
1631
            goto out;
1632 1633
        }

1634 1635 1636
        if (snapshot_node_name &&
            bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
            error_setg(errp, "New snapshot node name already in use");
1637
            goto out;
1638 1639 1640
        }

        flags = state->old_bs->open_flags;
1641 1642
        flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
        flags |= BDRV_O_NO_BACKING;
1643 1644 1645 1646

        /* create new image w/backing file */
        mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
        if (mode != NEW_IMAGE_MODE_EXISTING) {
1647 1648 1649
            int64_t size = bdrv_getlength(state->old_bs);
            if (size < 0) {
                error_setg_errno(errp, -size, "bdrv_getlength failed");
1650
                goto out;
1651
            }
1652 1653 1654
            bdrv_img_create(new_image_file, format,
                            state->old_bs->filename,
                            state->old_bs->drv->format_name,
1655
                            NULL, size, flags, false, &local_err);
1656 1657
            if (local_err) {
                error_propagate(errp, local_err);
1658
                goto out;
1659 1660 1661 1662 1663
            }
        }

        options = qdict_new();
        if (s->has_snapshot_node_name) {
1664
            qdict_put_str(options, "node-name", snapshot_node_name);
1665
        }
1666
        qdict_put_str(options, "driver", format);
1667 1668
    }

1669 1670
    state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
                              errp);
1671
    /* We will manually add the backing_hd field to the bs later */
1672
    if (!state->new_bs) {
1673
        goto out;
1674 1675
    }

1676
    if (bdrv_has_blk(state->new_bs)) {
1677
        error_setg(errp, "The snapshot is already in use");
1678
        goto out;
1679 1680 1681 1682
    }

    if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
                           errp)) {
1683
        goto out;
1684 1685 1686 1687
    }

    if (state->new_bs->backing != NULL) {
        error_setg(errp, "The snapshot already has a backing image");
1688
        goto out;
1689 1690 1691 1692
    }

    if (!state->new_bs->drv->supports_backing) {
        error_setg(errp, "The snapshot does not support backing images");
1693
        goto out;
1694 1695
    }

1696
    bdrv_set_aio_context(state->new_bs, aio_context);
1697

1698 1699 1700 1701 1702 1703 1704
    /* This removes our old bs and adds the new bs. This is an operation that
     * can fail, so we need to do it in .prepare; undoing it for abort is
     * always possible. */
    bdrv_ref(state->new_bs);
    bdrv_append(state->new_bs, state->old_bs, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1705
        goto out;
1706
    }
1707
    state->overlay_appended = true;
1708 1709 1710

out:
    aio_context_release(aio_context);
1711 1712
}

1713
static void external_snapshot_commit(BlkActionState *common)
1714
{
1715 1716
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1717 1718 1719 1720
    AioContext *aio_context;

    aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(aio_context);
1721

1722 1723 1724
    /* 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 */
1725
    if (!atomic_read(&state->old_bs->copy_on_read)) {
1726 1727 1728
        bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
                    NULL);
    }
1729 1730

    aio_context_release(aio_context);
1731 1732
}

1733
static void external_snapshot_abort(BlkActionState *common)
1734
{
1735 1736 1737
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
1738
        if (state->overlay_appended) {
1739 1740 1741 1742 1743
            AioContext *aio_context;

            aio_context = bdrv_get_aio_context(state->old_bs);
            aio_context_acquire(aio_context);

1744 1745 1746
            bdrv_ref(state->old_bs);   /* we can't let bdrv_set_backind_hd()
                                          close state->old_bs; we need it */
            bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1747
            bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1748
            bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1749 1750

            aio_context_release(aio_context);
1751
        }
1752
    }
1753 1754
}

1755
static void external_snapshot_clean(BlkActionState *common)
1756 1757 1758
{
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1759 1760 1761 1762
    AioContext *aio_context;

    if (!state->old_bs) {
        return;
1763
    }
1764 1765 1766 1767 1768 1769 1770 1771

    aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(aio_context);

    bdrv_drained_end(state->old_bs);
    bdrv_unref(state->new_bs);

    aio_context_release(aio_context);
1772 1773
}

1774
typedef struct DriveBackupState {
1775
    BlkActionState common;
1776 1777 1778 1779
    BlockDriverState *bs;
    BlockJob *job;
} DriveBackupState;

1780
static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1781
                            Error **errp);
1782

1783
static void drive_backup_prepare(BlkActionState *common, Error **errp)
1784 1785
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1786
    BlockDriverState *bs;
1787
    DriveBackup *backup;
1788
    AioContext *aio_context;
1789 1790
    Error *local_err = NULL;

1791
    assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1792
    backup = common->action->u.drive_backup.data;
1793

1794 1795
    bs = qmp_get_root_bs(backup->device, errp);
    if (!bs) {
1796 1797 1798
        return;
    }

1799 1800 1801 1802
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    /* Paired with .clean() */
1803
    bdrv_drained_begin(bs);
1804

1805
    state->bs = bs;
1806

1807
    state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1808
    if (local_err) {
1809
        error_propagate(errp, local_err);
1810
        goto out;
1811
    }
1812 1813 1814

out:
    aio_context_release(aio_context);
1815
}
1816

1817 1818 1819
static void drive_backup_commit(BlkActionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1820 1821 1822 1823 1824
    AioContext *aio_context;

    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

1825
    assert(state->job);
1826
    job_start(&state->job->job);
1827 1828

    aio_context_release(aio_context);
1829 1830
}

1831
static void drive_backup_abort(BlkActionState *common)
1832 1833 1834
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);

1835
    if (state->job) {
1836 1837 1838 1839 1840
        AioContext *aio_context;

        aio_context = bdrv_get_aio_context(state->bs);
        aio_context_acquire(aio_context);

1841
        job_cancel_sync(&state->job->job);
1842 1843

        aio_context_release(aio_context);
1844 1845 1846
    }
}

1847
static void drive_backup_clean(BlkActionState *common)
1848 1849
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1850
    AioContext *aio_context;
1851

1852 1853
    if (!state->bs) {
        return;
1854
    }
1855 1856 1857 1858 1859 1860 1861

    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1862 1863
}

1864
typedef struct BlockdevBackupState {
1865
    BlkActionState common;
1866 1867 1868 1869
    BlockDriverState *bs;
    BlockJob *job;
} BlockdevBackupState;

1870
static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1871
                                    Error **errp);
1872

1873
static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1874 1875 1876
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
    BlockdevBackup *backup;
1877
    BlockDriverState *bs, *target;
1878
    AioContext *aio_context;
1879 1880
    Error *local_err = NULL;

1881
    assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1882
    backup = common->action->u.blockdev_backup.data;
1883

1884
    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1885
    if (!bs) {
1886 1887 1888
        return;
    }

1889
    target = bdrv_lookup_bs(backup->target, backup->target, errp);
M
Max Reitz 已提交
1890
    if (!target) {
1891 1892 1893
        return;
    }

1894 1895
    aio_context = bdrv_get_aio_context(bs);
    if (aio_context != bdrv_get_aio_context(target)) {
1896 1897 1898
        error_setg(errp, "Backup between two IO threads is not implemented");
        return;
    }
1899
    aio_context_acquire(aio_context);
1900
    state->bs = bs;
1901 1902

    /* Paired with .clean() */
1903
    bdrv_drained_begin(state->bs);
1904

1905
    state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1906 1907
    if (local_err) {
        error_propagate(errp, local_err);
1908
        goto out;
1909
    }
1910 1911 1912

out:
    aio_context_release(aio_context);
1913
}
1914

1915 1916 1917
static void blockdev_backup_commit(BlkActionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1918 1919 1920 1921 1922
    AioContext *aio_context;

    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

1923
    assert(state->job);
1924
    job_start(&state->job->job);
1925 1926

    aio_context_release(aio_context);
1927 1928
}

1929
static void blockdev_backup_abort(BlkActionState *common)
1930 1931 1932
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);

1933
    if (state->job) {
1934 1935 1936 1937 1938
        AioContext *aio_context;

        aio_context = bdrv_get_aio_context(state->bs);
        aio_context_acquire(aio_context);

1939
        job_cancel_sync(&state->job->job);
1940 1941

        aio_context_release(aio_context);
1942 1943 1944
    }
}

1945
static void blockdev_backup_clean(BlkActionState *common)
1946 1947
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1948
    AioContext *aio_context;
1949

1950 1951
    if (!state->bs) {
        return;
1952
    }
1953 1954 1955 1956 1957 1958 1959

    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1960 1961
}

F
Fam Zheng 已提交
1962
typedef struct BlockDirtyBitmapState {
1963
    BlkActionState common;
F
Fam Zheng 已提交
1964 1965 1966 1967
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;
    HBitmap *backup;
    bool prepared;
1968
    bool was_enabled;
F
Fam Zheng 已提交
1969 1970
} BlockDirtyBitmapState;

1971
static void block_dirty_bitmap_add_prepare(BlkActionState *common,
F
Fam Zheng 已提交
1972 1973 1974 1975 1976 1977 1978
                                           Error **errp)
{
    Error *local_err = NULL;
    BlockDirtyBitmapAdd *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

1979 1980 1981 1982
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1983
    action = common->action->u.block_dirty_bitmap_add.data;
F
Fam Zheng 已提交
1984 1985 1986
    /* AIO context taken and released within qmp_block_dirty_bitmap_add */
    qmp_block_dirty_bitmap_add(action->node, action->name,
                               action->has_granularity, action->granularity,
1987
                               action->has_persistent, action->persistent,
1988
                               action->has_autoload, action->autoload,
1989
                               action->has_x_disabled, action->x_disabled,
F
Fam Zheng 已提交
1990 1991 1992 1993 1994 1995 1996 1997 1998
                               &local_err);

    if (!local_err) {
        state->prepared = true;
    } else {
        error_propagate(errp, local_err);
    }
}

1999
static void block_dirty_bitmap_add_abort(BlkActionState *common)
F
Fam Zheng 已提交
2000 2001 2002 2003 2004
{
    BlockDirtyBitmapAdd *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

2005
    action = common->action->u.block_dirty_bitmap_add.data;
F
Fam Zheng 已提交
2006 2007 2008 2009 2010 2011 2012 2013
    /* Should not be able to fail: IF the bitmap was added via .prepare(),
     * then the node reference and bitmap name must have been valid.
     */
    if (state->prepared) {
        qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
    }
}

2014
static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
F
Fam Zheng 已提交
2015 2016 2017 2018 2019 2020
                                             Error **errp)
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);
    BlockDirtyBitmap *action;

2021 2022 2023 2024
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

2025
    action = common->action->u.block_dirty_bitmap_clear.data;
F
Fam Zheng 已提交
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
    state->bitmap = block_dirty_bitmap_lookup(action->node,
                                              action->name,
                                              &state->bs,
                                              errp);
    if (!state->bitmap) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
        error_setg(errp, "Cannot modify a frozen bitmap");
        return;
2037 2038 2039
    } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
        error_setg(errp, "Cannot modify a locked bitmap");
        return;
F
Fam Zheng 已提交
2040 2041 2042
    } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
        error_setg(errp, "Cannot clear a disabled bitmap");
        return;
2043 2044 2045
    } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
        error_setg(errp, "Cannot clear a readonly bitmap");
        return;
F
Fam Zheng 已提交
2046 2047 2048 2049 2050
    }

    bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
}

2051
static void block_dirty_bitmap_clear_abort(BlkActionState *common)
F
Fam Zheng 已提交
2052 2053 2054 2055
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

2056 2057 2058
    if (state->backup) {
        bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
    }
F
Fam Zheng 已提交
2059 2060
}

2061
static void block_dirty_bitmap_clear_commit(BlkActionState *common)
F
Fam Zheng 已提交
2062 2063 2064 2065 2066 2067 2068
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    hbitmap_free(state->backup);
}

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 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
                                              Error **errp)
{
    BlockDirtyBitmap *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

    action = common->action->u.x_block_dirty_bitmap_enable.data;
    state->bitmap = block_dirty_bitmap_lookup(action->node,
                                              action->name,
                                              NULL,
                                              errp);
    if (!state->bitmap) {
        return;
    }

    state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
    bdrv_enable_dirty_bitmap(state->bitmap);
}

static void block_dirty_bitmap_enable_abort(BlkActionState *common)
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    if (!state->was_enabled) {
        bdrv_disable_dirty_bitmap(state->bitmap);
    }
}

static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
                                               Error **errp)
{
    BlockDirtyBitmap *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

    action = common->action->u.x_block_dirty_bitmap_disable.data;
    state->bitmap = block_dirty_bitmap_lookup(action->node,
                                              action->name,
                                              NULL,
                                              errp);
    if (!state->bitmap) {
        return;
    }

    state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
    bdrv_disable_dirty_bitmap(state->bitmap);
}

static void block_dirty_bitmap_disable_abort(BlkActionState *common)
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    if (state->was_enabled) {
        bdrv_enable_dirty_bitmap(state->bitmap);
    }
}

2137
static void abort_prepare(BlkActionState *common, Error **errp)
2138 2139 2140 2141
{
    error_setg(errp, "Transaction aborted using Abort action");
}

2142
static void abort_commit(BlkActionState *common)
2143
{
2144
    g_assert_not_reached(); /* this action never succeeds */
2145 2146
}

2147
static const BlkActionOps actions[] = {
2148 2149 2150 2151 2152
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
        .instance_size = sizeof(ExternalSnapshotState),
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
2153
        .clean = external_snapshot_clean,
2154
    },
2155
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2156
        .instance_size = sizeof(ExternalSnapshotState),
2157 2158 2159
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
2160
        .clean = external_snapshot_clean,
2161
    },
2162 2163 2164
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
2165
        .commit = drive_backup_commit,
2166
        .abort = drive_backup_abort,
2167
        .clean = drive_backup_clean,
2168
    },
2169 2170 2171
    [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
        .instance_size = sizeof(BlockdevBackupState),
        .prepare = blockdev_backup_prepare,
2172
        .commit = blockdev_backup_commit,
2173 2174 2175
        .abort = blockdev_backup_abort,
        .clean = blockdev_backup_clean,
    },
2176
    [TRANSACTION_ACTION_KIND_ABORT] = {
2177
        .instance_size = sizeof(BlkActionState),
2178 2179 2180
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
2181 2182 2183 2184
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
        .instance_size = sizeof(InternalSnapshotState),
        .prepare  = internal_snapshot_prepare,
        .abort = internal_snapshot_abort,
2185
        .clean = internal_snapshot_clean,
2186
    },
F
Fam Zheng 已提交
2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
    [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
        .instance_size = sizeof(BlockDirtyBitmapState),
        .prepare = block_dirty_bitmap_add_prepare,
        .abort = block_dirty_bitmap_add_abort,
    },
    [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
        .instance_size = sizeof(BlockDirtyBitmapState),
        .prepare = block_dirty_bitmap_clear_prepare,
        .commit = block_dirty_bitmap_clear_commit,
        .abort = block_dirty_bitmap_clear_abort,
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207
    },
    [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
        .instance_size = sizeof(BlockDirtyBitmapState),
        .prepare = block_dirty_bitmap_enable_prepare,
        .abort = block_dirty_bitmap_enable_abort,
    },
    [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
        .instance_size = sizeof(BlockDirtyBitmapState),
        .prepare = block_dirty_bitmap_disable_prepare,
        .abort = block_dirty_bitmap_disable_abort,
     }
2208 2209
};

2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228
/**
 * Allocate a TransactionProperties structure if necessary, and fill
 * that structure with desired defaults if they are unset.
 */
static TransactionProperties *get_transaction_properties(
    TransactionProperties *props)
{
    if (!props) {
        props = g_new0(TransactionProperties, 1);
    }

    if (!props->has_completion_mode) {
        props->has_completion_mode = true;
        props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
    }

    return props;
}

2229
/*
2230 2231
 * 'Atomic' group operations.  The operations are performed as a set, and if
 * any fail then we roll back all operations in the group.
2232
 */
2233 2234 2235 2236
void qmp_transaction(TransactionActionList *dev_list,
                     bool has_props,
                     struct TransactionProperties *props,
                     Error **errp)
2237
{
2238
    TransactionActionList *dev_entry = dev_list;
2239
    JobTxn *block_job_txn = NULL;
2240
    BlkActionState *state, *next;
2241
    Error *local_err = NULL;
2242

2243
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2244 2245
    QSIMPLEQ_INIT(&snap_bdrv_states);

2246
    /* Does this transaction get canceled as a group on failure?
2247
     * If not, we don't really need to make a JobTxn.
2248 2249 2250
     */
    props = get_transaction_properties(props);
    if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2251
        block_job_txn = job_txn_new();
2252 2253
    }

2254
    /* drain all i/o before any operations */
2255 2256
    bdrv_drain_all();

2257
    /* We don't do anything in this loop that commits us to the operations */
2258
    while (NULL != dev_entry) {
2259
        TransactionAction *dev_info = NULL;
2260
        const BlkActionOps *ops;
2261

2262 2263 2264
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

2265
        assert(dev_info->type < ARRAY_SIZE(actions));
2266

2267
        ops = &actions[dev_info->type];
2268 2269
        assert(ops->instance_size > 0);

2270 2271 2272
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
2273 2274
        state->block_job_txn = block_job_txn;
        state->txn_props = props;
2275
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2276

2277
        state->ops->prepare(state, &local_err);
2278
        if (local_err) {
2279 2280
            error_propagate(errp, local_err);
            goto delete_and_fail;
2281 2282 2283
        }
    }

2284
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2285 2286 2287
        if (state->ops->commit) {
            state->ops->commit(state);
        }
2288 2289 2290 2291 2292 2293
    }

    /* success */
    goto exit;

delete_and_fail:
2294
    /* failure, and it is all-or-none; roll back all operations */
2295 2296 2297
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
2298
        }
2299 2300
    }
exit:
2301 2302 2303
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
2304
        }
2305
        g_free(state);
2306
    }
2307 2308 2309
    if (!has_props) {
        qapi_free_TransactionProperties(props);
    }
2310
    job_txn_unref(block_job_txn);
2311 2312
}

2313 2314 2315
void qmp_eject(bool has_device, const char *device,
               bool has_id, const char *id,
               bool has_force, bool force, Error **errp)
2316
{
2317
    Error *local_err = NULL;
2318 2319 2320 2321 2322
    int rc;

    if (!has_force) {
        force = false;
    }
2323

2324 2325 2326
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      force, &local_err);
2327
    if (rc && rc != -ENOSYS) {
2328
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
2329
        return;
2330
    }
2331
    error_free(local_err);
2332

2333
    blockdev_remove_medium(has_device, device, has_id, id, errp);
2334 2335
}

2336 2337 2338
void qmp_block_passwd(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      const char *password, Error **errp)
2339
{
2340 2341
    error_setg(errp,
               "Setting block passwords directly is no longer supported");
2342 2343
}

2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
/*
 * Attempt to open the tray of @device.
 * If @force, ignore its tray lock.
 * Else, if the tray is locked, don't open it, but ask the guest to open it.
 * On error, store an error through @errp and return -errno.
 * If @device does not exist, return -ENODEV.
 * If it has no removable media, return -ENOTSUP.
 * If it has no tray, return -ENOSYS.
 * If the guest was asked to open the tray, return -EINPROGRESS.
 * Else, return 0.
2354
 */
2355 2356
static int do_open_tray(const char *blk_name, const char *qdev_id,
                        bool force, Error **errp)
2357 2358
{
    BlockBackend *blk;
2359
    const char *device = qdev_id ?: blk_name;
2360 2361
    bool locked;

2362
    blk = qmp_get_blk(blk_name, qdev_id, errp);
2363
    if (!blk) {
2364
        return -ENODEV;
2365 2366 2367 2368
    }

    if (!blk_dev_has_removable_media(blk)) {
        error_setg(errp, "Device '%s' is not removable", device);
2369
        return -ENOTSUP;
2370 2371
    }

2372
    if (!blk_dev_has_tray(blk)) {
2373 2374
        error_setg(errp, "Device '%s' does not have a tray", device);
        return -ENOSYS;
2375 2376
    }

2377
    if (blk_dev_is_tray_open(blk)) {
2378
        return 0;
2379 2380 2381 2382 2383 2384 2385 2386
    }

    locked = blk_dev_is_medium_locked(blk);
    if (locked) {
        blk_dev_eject_request(blk, force);
    }

    if (!locked || force) {
2387
        blk_dev_change_media_cb(blk, false, &error_abort);
2388
    }
2389 2390

    if (locked && !force) {
2391 2392 2393
        error_setg(errp, "Device '%s' is locked and force was not specified, "
                   "wait for tray to open and try again", device);
        return -EINPROGRESS;
2394 2395 2396 2397 2398
    }

    return 0;
}

2399 2400 2401
void qmp_blockdev_open_tray(bool has_device, const char *device,
                            bool has_id, const char *id,
                            bool has_force, bool force,
2402 2403
                            Error **errp)
{
2404 2405 2406
    Error *local_err = NULL;
    int rc;

2407 2408 2409
    if (!has_force) {
        force = false;
    }
2410 2411 2412
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      force, &local_err);
2413 2414 2415 2416 2417
    if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
        error_propagate(errp, local_err);
        return;
    }
    error_free(local_err);
2418 2419
}

2420 2421 2422
void qmp_blockdev_close_tray(bool has_device, const char *device,
                             bool has_id, const char *id,
                             Error **errp)
2423 2424
{
    BlockBackend *blk;
2425
    Error *local_err = NULL;
2426

2427 2428 2429 2430
    device = has_device ? device : NULL;
    id = has_id ? id : NULL;

    blk = qmp_get_blk(device, id, errp);
2431 2432 2433 2434 2435
    if (!blk) {
        return;
    }

    if (!blk_dev_has_removable_media(blk)) {
2436
        error_setg(errp, "Device '%s' is not removable", device ?: id);
2437 2438 2439
        return;
    }

2440 2441 2442 2443 2444
    if (!blk_dev_has_tray(blk)) {
        /* Ignore this command on tray-less devices */
        return;
    }

2445 2446 2447 2448
    if (!blk_dev_is_tray_open(blk)) {
        return;
    }

2449 2450 2451 2452 2453
    blk_dev_change_media_cb(blk, true, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }
2454 2455
}

2456 2457
static void blockdev_remove_medium(bool has_device, const char *device,
                                   bool has_id, const char *id, Error **errp)
2458 2459 2460 2461
{
    BlockBackend *blk;
    BlockDriverState *bs;
    AioContext *aio_context;
2462
    bool has_attached_device;
2463

2464 2465 2466 2467
    device = has_device ? device : NULL;
    id = has_id ? id : NULL;

    blk = qmp_get_blk(device, id, errp);
2468 2469 2470 2471 2472
    if (!blk) {
        return;
    }

    /* For BBs without a device, we can exchange the BDS tree at will */
2473
    has_attached_device = blk_get_attached_dev(blk);
2474

2475 2476
    if (has_attached_device && !blk_dev_has_removable_media(blk)) {
        error_setg(errp, "Device '%s' is not removable", device ?: id);
2477 2478 2479
        return;
    }

2480 2481 2482 2483
    if (has_attached_device && blk_dev_has_tray(blk) &&
        !blk_dev_is_tray_open(blk))
    {
        error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
        return;
    }

    bs = blk_bs(blk);
    if (!bs) {
        return;
    }

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

    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
        goto out;
    }

    blk_remove_bs(blk);

2501 2502 2503 2504 2505
    if (!blk_dev_has_tray(blk)) {
        /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
         * called at all); therefore, the medium needs to be ejected here.
         * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
         * value passed here (i.e. false). */
2506
        blk_dev_change_media_cb(blk, false, &error_abort);
2507 2508
    }

2509 2510 2511 2512
out:
    aio_context_release(aio_context);
}

2513
void qmp_blockdev_remove_medium(const char *id, Error **errp)
2514 2515 2516 2517
{
    blockdev_remove_medium(false, NULL, true, id, errp);
}

2518
static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2519 2520
                                            BlockDriverState *bs, Error **errp)
{
2521
    Error *local_err = NULL;
2522
    bool has_device;
2523
    int ret;
2524 2525 2526 2527 2528

    /* For BBs without a device, we can exchange the BDS tree at will */
    has_device = blk_get_attached_dev(blk);

    if (has_device && !blk_dev_has_removable_media(blk)) {
2529
        error_setg(errp, "Device is not removable");
2530 2531 2532
        return;
    }

2533
    if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2534
        error_setg(errp, "Tray of the device is not open");
2535 2536 2537 2538
        return;
    }

    if (blk_bs(blk)) {
2539
        error_setg(errp, "There already is a medium in the device");
2540 2541 2542
        return;
    }

2543 2544 2545 2546
    ret = blk_insert_bs(blk, bs, errp);
    if (ret < 0) {
        return;
    }
2547

2548 2549 2550 2551 2552 2553
    if (!blk_dev_has_tray(blk)) {
        /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
         * called at all); therefore, the medium needs to be pushed into the
         * slot here.
         * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
         * value passed here (i.e. true). */
2554 2555 2556 2557 2558 2559
        blk_dev_change_media_cb(blk, true, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            blk_remove_bs(blk);
            return;
        }
2560
    }
2561 2562
}

2563 2564 2565
static void blockdev_insert_medium(bool has_device, const char *device,
                                   bool has_id, const char *id,
                                   const char *node_name, Error **errp)
2566
{
2567
    BlockBackend *blk;
2568 2569
    BlockDriverState *bs;

2570 2571 2572 2573 2574 2575 2576
    blk = qmp_get_blk(has_device ? device : NULL,
                      has_id ? id : NULL,
                      errp);
    if (!blk) {
        return;
    }

2577 2578 2579 2580 2581 2582
    bs = bdrv_find_node(node_name);
    if (!bs) {
        error_setg(errp, "Node '%s' not found", node_name);
        return;
    }

2583
    if (bdrv_has_blk(bs)) {
2584
        error_setg(errp, "Node '%s' is already in use", node_name);
2585 2586 2587
        return;
    }

2588
    qmp_blockdev_insert_anon_medium(blk, bs, errp);
2589 2590
}

2591 2592
void qmp_blockdev_insert_medium(const char *id, const char *node_name,
                                Error **errp)
2593 2594 2595 2596
{
    blockdev_insert_medium(false, NULL, true, id, node_name, errp);
}

2597 2598 2599
void qmp_blockdev_change_medium(bool has_device, const char *device,
                                bool has_id, const char *id,
                                const char *filename,
2600
                                bool has_format, const char *format,
2601 2602
                                bool has_read_only,
                                BlockdevChangeReadOnlyMode read_only,
2603
                                Error **errp)
2604 2605 2606
{
    BlockBackend *blk;
    BlockDriverState *medium_bs = NULL;
2607
    int bdrv_flags;
2608
    bool detect_zeroes;
2609
    int rc;
2610 2611 2612
    QDict *options = NULL;
    Error *err = NULL;

2613 2614 2615
    blk = qmp_get_blk(has_device ? device : NULL,
                      has_id ? id : NULL,
                      errp);
2616 2617 2618 2619 2620 2621 2622 2623 2624
    if (!blk) {
        goto fail;
    }

    if (blk_bs(blk)) {
        blk_update_root_state(blk);
    }

    bdrv_flags = blk_get_open_flags_from_root_state(blk);
2625 2626
    bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
        BDRV_O_PROTOCOL);
2627

2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647
    if (!has_read_only) {
        read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
    }

    switch (read_only) {
    case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
        break;

    case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
        bdrv_flags &= ~BDRV_O_RDWR;
        break;

    case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
        bdrv_flags |= BDRV_O_RDWR;
        break;

    default:
        abort();
    }

2648 2649
    options = qdict_new();
    detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2650
    qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2651

2652
    if (has_format) {
2653
        qdict_put_str(options, "driver", format);
2654 2655
    }

2656 2657
    medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
    if (!medium_bs) {
2658 2659 2660
        goto fail;
    }

2661 2662 2663
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      false, &err);
2664
    if (rc && rc != -ENOSYS) {
2665 2666 2667
        error_propagate(errp, err);
        goto fail;
    }
2668 2669
    error_free(err);
    err = NULL;
2670

2671
    blockdev_remove_medium(has_device, device, has_id, id, &err);
2672 2673 2674 2675 2676
    if (err) {
        error_propagate(errp, err);
        goto fail;
    }

2677
    qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2678 2679 2680 2681 2682
    if (err) {
        error_propagate(errp, err);
        goto fail;
    }

2683
    qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2684 2685 2686 2687 2688 2689 2690 2691

fail:
    /* If the medium has been inserted, the device has its own reference, so
     * ours must be relinquished; and if it has not been inserted successfully,
     * the reference must be relinquished anyway */
    bdrv_unref(medium_bs);
}

2692
/* throttling disk I/O limits */
2693
void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2694
{
2695
    ThrottleConfig cfg;
2696
    BlockDriverState *bs;
2697
    BlockBackend *blk;
2698
    AioContext *aio_context;
2699

2700 2701 2702
    blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
                      arg->has_id ? arg->id : NULL,
                      errp);
2703
    if (!blk) {
2704
        return;
2705
    }
M
Max Reitz 已提交
2706 2707 2708 2709

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

2710
    bs = blk_bs(blk);
M
Max Reitz 已提交
2711
    if (!bs) {
2712
        error_setg(errp, "Device has no medium");
M
Max Reitz 已提交
2713 2714
        goto out;
    }
2715

2716
    throttle_config_init(&cfg);
2717 2718 2719
    cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
    cfg.buckets[THROTTLE_BPS_READ].avg  = arg->bps_rd;
    cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2720

2721 2722 2723
    cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
    cfg.buckets[THROTTLE_OPS_READ].avg  = arg->iops_rd;
    cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2724

2725 2726
    if (arg->has_bps_max) {
        cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2727
    }
2728 2729
    if (arg->has_bps_rd_max) {
        cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2730
    }
2731 2732
    if (arg->has_bps_wr_max) {
        cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2733
    }
2734 2735
    if (arg->has_iops_max) {
        cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2736
    }
2737 2738
    if (arg->has_iops_rd_max) {
        cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2739
    }
2740 2741
    if (arg->has_iops_wr_max) {
        cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2742
    }
2743

2744 2745
    if (arg->has_bps_max_length) {
        cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2746
    }
2747 2748
    if (arg->has_bps_rd_max_length) {
        cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2749
    }
2750 2751
    if (arg->has_bps_wr_max_length) {
        cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2752
    }
2753 2754
    if (arg->has_iops_max_length) {
        cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2755
    }
2756 2757
    if (arg->has_iops_rd_max_length) {
        cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2758
    }
2759 2760
    if (arg->has_iops_wr_max_length) {
        cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2761 2762
    }

2763 2764
    if (arg->has_iops_size) {
        cfg.op_size = arg->iops_size;
2765
    }
2766

2767
    if (!throttle_is_valid(&cfg, errp)) {
M
Max Reitz 已提交
2768
        goto out;
2769 2770
    }

2771 2772 2773
    if (throttle_enabled(&cfg)) {
        /* Enable I/O limits if they're not enabled yet, otherwise
         * just update the throttling group. */
2774
        if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2775
            blk_io_limits_enable(blk,
2776 2777 2778
                                 arg->has_group ? arg->group :
                                 arg->has_device ? arg->device :
                                 arg->id);
2779 2780
        } else if (arg->has_group) {
            blk_io_limits_update_group(blk, arg->group);
2781 2782
        }
        /* Set the new throttling configuration */
2783
        blk_set_io_limits(blk, &cfg);
2784
    } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2785
        /* If all throttling settings are set to 0, disable I/O limits */
2786
        blk_io_limits_disable(blk);
2787
    }
2788

M
Max Reitz 已提交
2789
out:
2790
    aio_context_release(aio_context);
2791 2792
}

2793 2794
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
                                bool has_granularity, uint32_t granularity,
2795
                                bool has_persistent, bool persistent,
2796
                                bool has_autoload, bool autoload,
2797
                                bool has_disabled, bool disabled,
2798 2799 2800
                                Error **errp)
{
    BlockDriverState *bs;
2801
    BdrvDirtyBitmap *bitmap;
2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816

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

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

    if (has_granularity) {
        if (granularity < 512 || !is_power_of_2(granularity)) {
            error_setg(errp, "Granularity must be power of 2 "
                             "and at least 512");
2817
            return;
2818 2819 2820 2821 2822 2823
        }
    } else {
        /* Default to cluster size, if available: */
        granularity = bdrv_get_default_bitmap_granularity(bs);
    }

2824 2825 2826
    if (!has_persistent) {
        persistent = false;
    }
2827

2828 2829
    if (has_autoload) {
        warn_report("Autoload option is deprecated and its value is ignored");
2830
    }
2831

2832 2833 2834 2835
    if (!has_disabled) {
        disabled = false;
    }

2836 2837 2838 2839 2840 2841 2842
    if (persistent &&
        !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
    {
        return;
    }

    bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2843 2844
    if (bitmap == NULL) {
        return;
2845
    }
2846

2847 2848 2849 2850
    if (disabled) {
        bdrv_disable_dirty_bitmap(bitmap);
    }

2851
    bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2852 2853 2854 2855 2856 2857 2858
}

void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
                                   Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;
2859
    Error *local_err = NULL;
2860

2861
    bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2862 2863 2864 2865
    if (!bitmap || !bs) {
        return;
    }

2866 2867 2868 2869
    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be removed",
                   name);
2870
        return;
2871 2872 2873 2874 2875
    } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently locked and cannot be removed",
                   name);
        return;
2876
    }
2877 2878 2879 2880 2881 2882 2883 2884 2885

    if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
        bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
        if (local_err != NULL) {
            error_propagate(errp, local_err);
            return;
        }
    }

2886 2887 2888
    bdrv_release_dirty_bitmap(bs, bitmap);
}

2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
/**
 * 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)
{
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;

2899
    bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2900 2901 2902 2903 2904 2905 2906 2907
    if (!bitmap || !bs) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be modified",
                   name);
2908
        return;
2909 2910 2911 2912 2913
    } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently locked and cannot be modified",
                   name);
        return;
2914 2915 2916 2917
    } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently disabled and cannot be cleared",
                   name);
2918
        return;
2919 2920 2921
    } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
        error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
        return;
2922 2923
    }

F
Fam Zheng 已提交
2924
    bdrv_clear_dirty_bitmap(bitmap, NULL);
2925 2926
}

2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968
void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name,
                                   Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;

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

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be enabled",
                   name);
        return;
    }

    bdrv_enable_dirty_bitmap(bitmap);
}

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

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

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be disabled",
                   name);
        return;
    }

    bdrv_disable_dirty_bitmap(bitmap);
}

2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name,
                                    const char *src_name, Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *dst, *src;

    dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
    if (!dst) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(dst)) {
        error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
                   dst_name);
        return;
    } else if (bdrv_dirty_bitmap_readonly(dst)) {
        error_setg(errp, "Bitmap '%s' is readonly and cannot be modified",
                   dst_name);
        return;
    }

    src = bdrv_find_dirty_bitmap(bs, src_name);
    if (!src) {
        error_setg(errp, "Dirty bitmap '%s' not found", src_name);
        return;
    }

    bdrv_merge_dirty_bitmap(dst, src, errp);
}

2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023
BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
                                                              const char *name,
                                                              Error **errp)
{
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;
    BlockDirtyBitmapSha256 *ret = NULL;
    char *sha256;

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

    sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
    if (sha256 == NULL) {
        return NULL;
    }

    ret = g_new(BlockDirtyBitmapSha256, 1);
    ret->sha256 = sha256;

    return ret;
}

3024
void hmp_drive_del(Monitor *mon, const QDict *qdict)
3025 3026
{
    const char *id = qdict_get_str(qdict, "id");
3027
    BlockBackend *blk;
3028
    BlockDriverState *bs;
3029
    AioContext *aio_context;
3030
    Error *local_err = NULL;
3031

3032 3033
    bs = bdrv_find_node(id);
    if (bs) {
3034
        qmp_blockdev_del(id, &local_err);
3035 3036 3037 3038 3039 3040
        if (local_err) {
            error_report_err(local_err);
        }
        return;
    }

3041 3042
    blk = blk_by_name(id);
    if (!blk) {
3043
        error_report("Device '%s' not found", id);
3044
        return;
3045
    }
3046

3047
    if (!blk_legacy_dinfo(blk)) {
3048 3049
        error_report("Deleting device added with blockdev-add"
                     " is not supported");
3050
        return;
3051 3052
    }

M
Max Reitz 已提交
3053
    aio_context = blk_get_aio_context(blk);
3054 3055
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
3056 3057 3058 3059 3060 3061 3062
    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;
        }
3063

3064
        blk_remove_bs(blk);
M
Max Reitz 已提交
3065
    }
3066

3067
    /* Make the BlockBackend and the attached BlockDriverState anonymous */
3068 3069
    monitor_remove_blk(blk);

3070 3071
    /* If this BlockBackend has a device attached to it, its refcount will be
     * decremented when the device is removed; otherwise we have to do so here.
3072
     */
3073
    if (blk_get_attached_dev(blk)) {
3074
        /* Further I/O must not pause the guest */
3075 3076
        blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
                         BLOCKDEV_ON_ERROR_REPORT);
3077
    } else {
3078
        blk_unref(blk);
3079 3080
    }

3081
    aio_context_release(aio_context);
3082
}
3083

3084 3085 3086
void qmp_block_resize(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      int64_t size, Error **errp)
3087
{
3088
    Error *local_err = NULL;
3089
    BlockBackend *blk = NULL;
3090
    BlockDriverState *bs;
3091
    AioContext *aio_context;
3092
    int ret;
3093

3094 3095 3096
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
3097
    if (local_err) {
3098 3099 3100 3101
        error_propagate(errp, local_err);
        return;
    }

3102 3103 3104
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

3105
    if (!bdrv_is_first_non_filter(bs)) {
3106
        error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3107
        goto out;
3108 3109 3110
    }

    if (size < 0) {
3111
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3112
        goto out;
3113 3114
    }

3115
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3116
        error_setg(errp, QERR_DEVICE_IN_USE, device);
3117
        goto out;
3118 3119
    }

3120
    blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3121 3122 3123 3124
    ret = blk_insert_bs(blk, bs, errp);
    if (ret < 0) {
        goto out;
    }
3125

3126
    bdrv_drained_begin(bs);
3127
    ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3128
    bdrv_drained_end(bs);
3129 3130

out:
3131
    blk_unref(blk);
3132
    aio_context_release(aio_context);
3133
}
3134

3135
void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3136
                      bool has_base, const char *base,
3137
                      bool has_base_node, const char *base_node,
3138 3139
                      bool has_backing_file, const char *backing_file,
                      bool has_speed, int64_t speed,
3140 3141
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
3142
{
3143
    BlockDriverState *bs, *iter;
3144
    BlockDriverState *base_bs = NULL;
3145
    AioContext *aio_context;
3146
    Error *local_err = NULL;
3147
    const char *base_name = NULL;
3148

3149 3150 3151 3152
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

3153
    bs = bdrv_lookup_bs(device, device, errp);
3154
    if (!bs) {
3155 3156 3157
        return;
    }

3158
    aio_context = bdrv_get_aio_context(bs);
3159 3160
    aio_context_acquire(aio_context);

3161 3162 3163 3164 3165 3166
    if (has_base && has_base_node) {
        error_setg(errp, "'base' and 'base-node' cannot be specified "
                   "at the same time");
        goto out;
    }

3167
    if (has_base) {
3168 3169
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
3170
            error_setg(errp, QERR_BASE_NOT_FOUND, base);
3171
            goto out;
3172
        }
3173
        assert(bdrv_get_aio_context(base_bs) == aio_context);
3174
        base_name = base;
3175 3176
    }

3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190
    if (has_base_node) {
        base_bs = bdrv_lookup_bs(NULL, base_node, errp);
        if (!base_bs) {
            goto out;
        }
        if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
            error_setg(errp, "Node '%s' is not a backing image of '%s'",
                       base_node, device);
            goto out;
        }
        assert(bdrv_get_aio_context(base_bs) == aio_context);
        base_name = base_bs->filename;
    }

3191 3192 3193 3194 3195 3196 3197
    /* Check for op blockers in the whole chain between bs and base */
    for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
        if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
            goto out;
        }
    }

3198 3199 3200 3201 3202
    /* 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");
3203
        goto out;
3204 3205 3206 3207 3208
    }

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

3209
    stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3210
                 has_speed ? speed : 0, on_error, &local_err);
3211
    if (local_err) {
3212
        error_propagate(errp, local_err);
3213
        goto out;
3214 3215 3216
    }

    trace_qmp_block_stream(bs, bs->job);
3217 3218 3219

out:
    aio_context_release(aio_context);
3220
}
3221

3222
void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3223 3224
                      bool has_base, const char *base,
                      bool has_top, const char *top,
3225
                      bool has_backing_file, const char *backing_file,
3226
                      bool has_speed, int64_t speed,
3227
                      bool has_filter_node_name, const char *filter_node_name,
3228 3229 3230
                      Error **errp)
{
    BlockDriverState *bs;
3231
    BlockDriverState *iter;
3232
    BlockDriverState *base_bs, *top_bs;
3233
    AioContext *aio_context;
3234 3235 3236 3237
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
3238
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3239

3240 3241 3242
    if (!has_speed) {
        speed = 0;
    }
3243 3244 3245
    if (!has_filter_node_name) {
        filter_node_name = NULL;
    }
3246

3247 3248 3249 3250 3251
    /* 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. */
3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
    bs = qmp_get_root_bs(device, &local_err);
    if (!bs) {
        bs = bdrv_lookup_bs(device, device, NULL);
        if (!bs) {
            error_free(local_err);
            error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                      "Device '%s' not found", device);
        } else {
            error_propagate(errp, local_err);
        }
3262
        return;
3263 3264
    }

3265
    aio_context = bdrv_get_aio_context(bs);
3266 3267
    aio_context_acquire(aio_context);

3268
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3269
        goto out;
3270 3271 3272 3273 3274
    }

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

3275
    if (has_top && top) {
3276 3277 3278 3279 3280 3281 3282
        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");
3283
        goto out;
3284 3285
    }

3286 3287
    assert(bdrv_get_aio_context(top_bs) == aio_context);

3288 3289 3290 3291 3292 3293 3294
    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) {
3295
        error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3296
        goto out;
3297 3298
    }

3299 3300
    assert(bdrv_get_aio_context(base_bs) == aio_context);

3301 3302 3303 3304
    for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
        if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
            goto out;
        }
3305 3306
    }

3307 3308 3309
    /* Do not allow attempts to commit an image into itself */
    if (top_bs == base_bs) {
        error_setg(errp, "cannot commit an image into itself");
3310
        goto out;
3311 3312
    }

3313
    if (top_bs == bs) {
3314 3315 3316
        if (has_backing_file) {
            error_setg(errp, "'backing-file' specified,"
                             " but 'top' is the active layer");
3317
            goto out;
3318
        }
3319
        commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3320
                            JOB_DEFAULT, speed, on_error,
3321
                            filter_node_name, NULL, NULL, false, &local_err);
3322
    } else {
3323 3324 3325 3326
        BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
        if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
            goto out;
        }
3327
        commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3328
                     on_error, has_backing_file ? backing_file : NULL,
3329
                     filter_node_name, &local_err);
3330
    }
3331 3332
    if (local_err != NULL) {
        error_propagate(errp, local_err);
3333
        goto out;
3334
    }
3335 3336 3337

out:
    aio_context_release(aio_context);
3338 3339
}

3340
static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3341
                                 Error **errp)
3342 3343 3344
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
3345
    BlockDriverState *source = NULL;
3346
    BlockJob *job = NULL;
3347
    BdrvDirtyBitmap *bmap = NULL;
3348
    AioContext *aio_context;
3349
    QDict *options = NULL;
3350
    Error *local_err = NULL;
3351
    int flags, job_flags = JOB_DEFAULT;
3352
    int64_t size;
3353
    bool set_backing_hd = false;
3354

3355 3356
    if (!backup->has_speed) {
        backup->speed = 0;
3357
    }
3358 3359
    if (!backup->has_on_source_error) {
        backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3360
    }
3361 3362
    if (!backup->has_on_target_error) {
        backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3363
    }
3364 3365 3366 3367 3368
    if (!backup->has_mode) {
        backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
    if (!backup->has_job_id) {
        backup->job_id = NULL;
3369
    }
3370 3371 3372 3373 3374 3375
    if (!backup->has_auto_finalize) {
        backup->auto_finalize = true;
    }
    if (!backup->has_auto_dismiss) {
        backup->auto_dismiss = true;
    }
3376 3377 3378
    if (!backup->has_compress) {
        backup->compress = false;
    }
3379

3380
    bs = qmp_get_root_bs(backup->device, errp);
3381
    if (!bs) {
3382
        return NULL;
3383 3384
    }

3385
    aio_context = bdrv_get_aio_context(bs);
3386 3387
    aio_context_acquire(aio_context);

3388 3389 3390
    if (!backup->has_format) {
        backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
                         NULL : (char*) bs->drv->format_name;
3391 3392
    }

3393
    /* Early check to avoid creating target */
3394
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3395
        goto out;
3396 3397
    }

3398
    flags = bs->open_flags | BDRV_O_RDWR;
3399

3400 3401
    /* See if we have a backing HD we can use to create our new image
     * on top of. */
3402
    if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3403
        source = backing_bs(bs);
3404
        if (!source) {
3405
            backup->sync = MIRROR_SYNC_MODE_FULL;
3406 3407
        }
    }
3408
    if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3409
        source = bs;
3410 3411
        flags |= BDRV_O_NO_BACKING;
        set_backing_hd = true;
3412 3413
    }

3414 3415 3416
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
3417
        goto out;
3418 3419
    }

3420 3421
    if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
        assert(backup->format);
3422
        if (source) {
3423
            bdrv_img_create(backup->target, backup->format, source->filename,
3424
                            source->drv->format_name, NULL,
3425
                            size, flags, false, &local_err);
3426
        } else {
3427
            bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3428
                            size, flags, false, &local_err);
3429
        }
3430 3431
    }

3432
    if (local_err) {
3433
        error_propagate(errp, local_err);
3434
        goto out;
3435 3436
    }

3437
    if (backup->format) {
3438 3439 3440
        if (!options) {
            options = qdict_new();
        }
3441
        qdict_put_str(options, "driver", backup->format);
3442 3443
    }

3444
    target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3445
    if (!target_bs) {
3446
        goto out;
3447 3448
    }

3449 3450
    bdrv_set_aio_context(target_bs, aio_context);

3451 3452 3453 3454 3455 3456 3457 3458
    if (set_backing_hd) {
        bdrv_set_backing_hd(target_bs, source, &local_err);
        if (local_err) {
            bdrv_unref(target_bs);
            goto out;
        }
    }

3459 3460
    if (backup->has_bitmap) {
        bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3461
        if (!bmap) {
3462
            error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3463
            bdrv_unref(target_bs);
3464 3465
            goto out;
        }
3466 3467 3468 3469 3470 3471
        if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
            error_setg(errp,
                       "Bitmap '%s' is currently locked and cannot be used for "
                       "backup", backup->bitmap);
            goto out;
        }
3472
    }
3473
    if (!backup->auto_finalize) {
3474
        job_flags |= JOB_MANUAL_FINALIZE;
3475 3476
    }
    if (!backup->auto_dismiss) {
3477
        job_flags |= JOB_MANUAL_DISMISS;
3478
    }
3479

3480 3481 3482
    job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
                            backup->sync, bmap, backup->compress,
                            backup->on_source_error, backup->on_target_error,
3483
                            job_flags, NULL, NULL, txn, &local_err);
3484
    bdrv_unref(target_bs);
3485 3486
    if (local_err != NULL) {
        error_propagate(errp, local_err);
3487
        goto out;
3488
    }
3489 3490 3491

out:
    aio_context_release(aio_context);
3492
    return job;
3493 3494
}

3495
void qmp_drive_backup(DriveBackup *arg, Error **errp)
3496
{
3497 3498 3499 3500

    BlockJob *job;
    job = do_drive_backup(arg, NULL, errp);
    if (job) {
3501
        job_start(&job->job);
3502
    }
3503 3504
}

3505 3506
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
3507
    return bdrv_named_nodes_list(errp);
3508 3509
}

3510
BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3511
                             Error **errp)
3512 3513 3514 3515 3516
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    Error *local_err = NULL;
    AioContext *aio_context;
3517
    BlockJob *job = NULL;
3518
    int job_flags = JOB_DEFAULT;
3519

3520 3521
    if (!backup->has_speed) {
        backup->speed = 0;
3522
    }
3523 3524 3525 3526 3527
    if (!backup->has_on_source_error) {
        backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!backup->has_on_target_error) {
        backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3528
    }
3529 3530
    if (!backup->has_job_id) {
        backup->job_id = NULL;
3531
    }
3532 3533 3534 3535 3536 3537
    if (!backup->has_auto_finalize) {
        backup->auto_finalize = true;
    }
    if (!backup->has_auto_dismiss) {
        backup->auto_dismiss = true;
    }
3538 3539 3540
    if (!backup->has_compress) {
        backup->compress = false;
    }
3541

3542
    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
3543
    if (!bs) {
3544
        return NULL;
3545 3546
    }

3547
    aio_context = bdrv_get_aio_context(bs);
3548 3549
    aio_context_acquire(aio_context);

3550
    target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3551
    if (!target_bs) {
M
Max Reitz 已提交
3552 3553
        goto out;
    }
3554

3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565
    if (bdrv_get_aio_context(target_bs) != aio_context) {
        if (!bdrv_has_blk(target_bs)) {
            /* The target BDS is not attached, we can safely move it to another
             * AioContext. */
            bdrv_set_aio_context(target_bs, aio_context);
        } else {
            error_setg(errp, "Target is attached to a different thread from "
                             "source.");
            goto out;
        }
    }
3566
    if (!backup->auto_finalize) {
3567
        job_flags |= JOB_MANUAL_FINALIZE;
3568 3569
    }
    if (!backup->auto_dismiss) {
3570
        job_flags |= JOB_MANUAL_DISMISS;
3571
    }
3572 3573 3574
    job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
                            backup->sync, NULL, backup->compress,
                            backup->on_source_error, backup->on_target_error,
3575
                            job_flags, NULL, NULL, txn, &local_err);
3576 3577 3578 3579 3580
    if (local_err != NULL) {
        error_propagate(errp, local_err);
    }
out:
    aio_context_release(aio_context);
3581
    return job;
3582 3583
}

3584 3585
void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
{
3586 3587 3588
    BlockJob *job;
    job = do_blockdev_backup(arg, NULL, errp);
    if (job) {
3589
        job_start(&job->job);
3590
    }
3591 3592
}

3593 3594 3595
/* Parameter check and block job starting for drive mirroring.
 * Caller should hold @device and @target's aio context (must be the same).
 **/
3596
static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3597 3598 3599
                                   BlockDriverState *target,
                                   bool has_replaces, const char *replaces,
                                   enum MirrorSyncMode sync,
3600
                                   BlockMirrorBackingMode backing_mode,
3601 3602 3603 3604 3605 3606 3607 3608
                                   bool has_speed, int64_t speed,
                                   bool has_granularity, uint32_t granularity,
                                   bool has_buf_size, int64_t buf_size,
                                   bool has_on_source_error,
                                   BlockdevOnError on_source_error,
                                   bool has_on_target_error,
                                   BlockdevOnError on_target_error,
                                   bool has_unmap, bool unmap,
3609 3610
                                   bool has_filter_node_name,
                                   const char *filter_node_name,
3611
                                   bool has_copy_mode, MirrorCopyMode copy_mode,
3612
                                   Error **errp)
3613 3614 3615 3616 3617
{

    if (!has_speed) {
        speed = 0;
    }
3618 3619 3620 3621 3622 3623
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
3624 3625 3626
    if (!has_granularity) {
        granularity = 0;
    }
3627
    if (!has_buf_size) {
W
Wen Congyang 已提交
3628
        buf_size = 0;
3629
    }
3630 3631 3632
    if (!has_unmap) {
        unmap = true;
    }
3633 3634 3635
    if (!has_filter_node_name) {
        filter_node_name = NULL;
    }
3636 3637 3638
    if (!has_copy_mode) {
        copy_mode = MIRROR_COPY_MODE_BACKGROUND;
    }
3639

3640
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3641 3642
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "a value in range [512B, 64MB]");
3643 3644 3645
        return;
    }
    if (granularity & (granularity - 1)) {
3646 3647
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "power of 2");
3648 3649
        return;
    }
3650

3651 3652 3653
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
        return;
    }
3654 3655 3656
    if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
        return;
    }
3657 3658 3659 3660 3661 3662 3663 3664

    if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
        sync = MIRROR_SYNC_MODE_FULL;
    }

    /* 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
     */
3665
    mirror_start(job_id, bs, target,
3666
                 has_replaces ? replaces : NULL,
3667
                 speed, granularity, buf_size, sync, backing_mode,
3668
                 on_source_error, on_target_error, unmap, filter_node_name,
3669
                 copy_mode, errp);
3670 3671
}

3672
void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3673 3674 3675 3676
{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
    AioContext *aio_context;
3677
    BlockMirrorBackingMode backing_mode;
3678 3679 3680 3681
    Error *local_err = NULL;
    QDict *options = NULL;
    int flags;
    int64_t size;
3682
    const char *format = arg->format;
3683

3684 3685
    bs = qmp_get_root_bs(arg->device, errp);
    if (!bs) {
3686 3687 3688
        return;
    }

3689 3690 3691 3692 3693
    /* Early check to avoid creating target */
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
        return;
    }

3694
    aio_context = bdrv_get_aio_context(bs);
3695 3696
    aio_context_acquire(aio_context);

3697 3698
    if (!arg->has_mode) {
        arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3699
    }
3700

3701 3702 3703
    if (!arg->has_format) {
        format = (arg->mode == NEW_IMAGE_MODE_EXISTING
                  ? NULL : bs->drv->format_name);
3704 3705
    }

3706
    flags = bs->open_flags | BDRV_O_RDWR;
3707
    source = backing_bs(bs);
3708 3709
    if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
        arg->sync = MIRROR_SYNC_MODE_FULL;
3710
    }
3711
    if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3712 3713
        source = bs;
    }
3714

3715 3716 3717
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
3718
        goto out;
3719 3720
    }

3721
    if (arg->has_replaces) {
3722
        BlockDriverState *to_replace_bs;
3723 3724
        AioContext *replace_aio_context;
        int64_t replace_size;
3725

3726
        if (!arg->has_node_name) {
3727 3728
            error_setg(errp, "a node-name must be provided when replacing a"
                             " named node of the graph");
3729
            goto out;
3730 3731
        }

3732
        to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3733 3734 3735

        if (!to_replace_bs) {
            error_propagate(errp, local_err);
3736
            goto out;
3737 3738
        }

3739 3740 3741 3742 3743 3744
        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) {
3745 3746
            error_setg(errp, "cannot replace image with a mirror image of "
                             "different size");
3747
            goto out;
3748 3749 3750
        }
    }

3751
    if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3752 3753 3754 3755 3756
        backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
    } else {
        backing_mode = MIRROR_OPEN_BACKING_CHAIN;
    }

3757 3758 3759
    /* Don't open backing image in create() */
    flags |= BDRV_O_NO_BACKING;

3760 3761
    if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
        && arg->mode != NEW_IMAGE_MODE_EXISTING)
3762
    {
3763
        /* create new image w/o backing file */
3764
        assert(format);
3765
        bdrv_img_create(arg->target, format,
3766
                        NULL, NULL, NULL, size, flags, false, &local_err);
3767
    } else {
3768
        switch (arg->mode) {
3769 3770 3771 3772
        case NEW_IMAGE_MODE_EXISTING:
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
3773
            bdrv_img_create(arg->target, format,
3774 3775
                            source->filename,
                            source->drv->format_name,
3776
                            NULL, size, flags, false, &local_err);
3777 3778 3779 3780 3781 3782
            break;
        default:
            abort();
        }
    }

3783
    if (local_err) {
3784
        error_propagate(errp, local_err);
3785
        goto out;
3786 3787
    }

3788
    options = qdict_new();
3789
    if (arg->has_node_name) {
3790
        qdict_put_str(options, "node-name", arg->node_name);
3791
    }
3792
    if (format) {
3793
        qdict_put_str(options, "driver", format);
3794
    }
3795

3796 3797 3798
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
3799
    target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3800
    if (!target_bs) {
3801
        goto out;
3802 3803
    }

3804 3805
    bdrv_set_aio_context(target_bs, aio_context);

3806 3807 3808 3809 3810 3811 3812 3813
    blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
                           arg->has_replaces, arg->replaces, arg->sync,
                           backing_mode, arg->has_speed, arg->speed,
                           arg->has_granularity, arg->granularity,
                           arg->has_buf_size, arg->buf_size,
                           arg->has_on_source_error, arg->on_source_error,
                           arg->has_on_target_error, arg->on_target_error,
                           arg->has_unmap, arg->unmap,
3814
                           false, NULL,
3815
                           arg->has_copy_mode, arg->copy_mode,
3816
                           &local_err);
3817
    bdrv_unref(target_bs);
3818
    error_propagate(errp, local_err);
3819 3820
out:
    aio_context_release(aio_context);
3821 3822
}

3823 3824
void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
                         const char *device, const char *target,
3825 3826 3827 3828 3829 3830 3831 3832 3833
                         bool has_replaces, const char *replaces,
                         MirrorSyncMode sync,
                         bool has_speed, int64_t speed,
                         bool has_granularity, uint32_t granularity,
                         bool has_buf_size, int64_t buf_size,
                         bool has_on_source_error,
                         BlockdevOnError on_source_error,
                         bool has_on_target_error,
                         BlockdevOnError on_target_error,
3834 3835
                         bool has_filter_node_name,
                         const char *filter_node_name,
3836
                         bool has_copy_mode, MirrorCopyMode copy_mode,
3837 3838 3839 3840 3841
                         Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    AioContext *aio_context;
3842
    BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3843 3844
    Error *local_err = NULL;

3845
    bs = qmp_get_root_bs(device, errp);
3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859
    if (!bs) {
        return;
    }

    target_bs = bdrv_lookup_bs(target, target, errp);
    if (!target_bs) {
        return;
    }

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

    bdrv_set_aio_context(target_bs, aio_context);

3860
    blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3861
                           has_replaces, replaces, sync, backing_mode,
3862 3863 3864 3865 3866 3867
                           has_speed, speed,
                           has_granularity, granularity,
                           has_buf_size, buf_size,
                           has_on_source_error, on_source_error,
                           has_on_target_error, on_target_error,
                           true, true,
3868
                           has_filter_node_name, filter_node_name,
3869
                           has_copy_mode, copy_mode,
3870
                           &local_err);
3871
    error_propagate(errp, local_err);
3872 3873 3874 3875

    aio_context_release(aio_context);
}

3876 3877
/* Get a block job using its ID and acquire its AioContext */
static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3878
                                Error **errp)
3879
{
3880
    BlockJob *job;
3881

3882
    assert(id != NULL);
M
Max Reitz 已提交
3883

3884
    *aio_context = NULL;
3885

3886
    job = block_job_get(id);
M
Max Reitz 已提交
3887

3888 3889 3890 3891
    if (!job) {
        error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
                  "Block job '%s' not found", id);
        return NULL;
3892
    }
3893

3894 3895
    *aio_context = blk_get_aio_context(job->blk);
    aio_context_acquire(*aio_context);
3896

3897
    return job;
3898 3899
}

3900
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3901
{
3902
    AioContext *aio_context;
3903
    BlockJob *job = find_block_job(device, &aio_context, errp);
3904 3905 3906 3907 3908

    if (!job) {
        return;
    }

3909
    block_job_set_speed(job, speed, errp);
3910
    aio_context_release(aio_context);
3911
}
3912

3913 3914
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
3915
{
3916
    AioContext *aio_context;
3917
    BlockJob *job = find_block_job(device, &aio_context, errp);
3918

3919 3920 3921
    if (!job) {
        return;
    }
3922 3923 3924 3925 3926

    if (!has_force) {
        force = false;
    }

3927
    if (job_user_paused(&job->job) && !force) {
3928 3929
        error_setg(errp, "The block job for device '%s' is currently paused",
                   device);
3930
        goto out;
3931
    }
3932 3933

    trace_qmp_block_job_cancel(job);
3934
    job_user_cancel(&job->job, force, errp);
3935 3936
out:
    aio_context_release(aio_context);
3937
}
3938

3939 3940
void qmp_block_job_pause(const char *device, Error **errp)
{
3941
    AioContext *aio_context;
3942
    BlockJob *job = find_block_job(device, &aio_context, errp);
3943

3944
    if (!job) {
3945 3946 3947 3948
        return;
    }

    trace_qmp_block_job_pause(job);
3949
    job_user_pause(&job->job, errp);
3950
    aio_context_release(aio_context);
3951 3952 3953 3954
}

void qmp_block_job_resume(const char *device, Error **errp)
{
3955
    AioContext *aio_context;
3956
    BlockJob *job = find_block_job(device, &aio_context, errp);
3957

3958
    if (!job) {
3959 3960 3961 3962
        return;
    }

    trace_qmp_block_job_resume(job);
3963
    job_user_resume(&job->job, errp);
3964
    aio_context_release(aio_context);
3965 3966
}

3967 3968
void qmp_block_job_complete(const char *device, Error **errp)
{
3969
    AioContext *aio_context;
3970
    BlockJob *job = find_block_job(device, &aio_context, errp);
3971 3972 3973 3974 3975 3976

    if (!job) {
        return;
    }

    trace_qmp_block_job_complete(job);
3977
    job_complete(&job->job, errp);
3978
    aio_context_release(aio_context);
3979 3980
}

3981 3982 3983 3984 3985 3986 3987 3988 3989 3990
void qmp_block_job_finalize(const char *id, Error **errp)
{
    AioContext *aio_context;
    BlockJob *job = find_block_job(id, &aio_context, errp);

    if (!job) {
        return;
    }

    trace_qmp_block_job_finalize(job);
3991
    job_finalize(&job->job, errp);
3992 3993 3994
    aio_context_release(aio_context);
}

3995 3996 3997
void qmp_block_job_dismiss(const char *id, Error **errp)
{
    AioContext *aio_context;
K
Kevin Wolf 已提交
3998 3999
    BlockJob *bjob = find_block_job(id, &aio_context, errp);
    Job *job;
4000

K
Kevin Wolf 已提交
4001
    if (!bjob) {
4002 4003 4004
        return;
    }

K
Kevin Wolf 已提交
4005 4006 4007
    trace_qmp_block_job_dismiss(bjob);
    job = &bjob->job;
    job_dismiss(&job, errp);
4008 4009 4010
    aio_context_release(aio_context);
}

4011 4012 4013 4014 4015 4016
void qmp_change_backing_file(const char *device,
                             const char *image_node_name,
                             const char *backing_file,
                             Error **errp)
{
    BlockDriverState *bs = NULL;
4017
    AioContext *aio_context;
4018 4019 4020 4021 4022 4023
    BlockDriverState *image_bs = NULL;
    Error *local_err = NULL;
    bool ro;
    int open_flags;
    int ret;

4024 4025
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
4026 4027 4028
        return;
    }

4029
    aio_context = bdrv_get_aio_context(bs);
4030 4031
    aio_context_acquire(aio_context);

4032 4033 4034
    image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
4035
        goto out;
4036 4037 4038 4039
    }

    if (!image_bs) {
        error_setg(errp, "image file not found");
4040
        goto out;
4041 4042 4043 4044 4045
    }

    if (bdrv_find_base(image_bs) == image_bs) {
        error_setg(errp, "not allowing backing file change on an image "
                         "without a backing file");
4046
        goto out;
4047 4048 4049 4050 4051
    }

    /* 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)) {
4052
        goto out;
4053 4054 4055 4056 4057 4058
    }

    /* final sanity check */
    if (!bdrv_chain_contains(bs, image_bs)) {
        error_setg(errp, "'%s' and image file are not in the same chain",
                   device);
4059
        goto out;
4060 4061 4062 4063 4064 4065 4066 4067 4068 4069
    }

    /* 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);
4070
            goto out;
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085
        }
    }

    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);
4086
        error_propagate(errp, local_err);
4087
    }
4088 4089 4090

out:
    aio_context_release(aio_context);
4091 4092
}

4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106
void hmp_drive_add_node(Monitor *mon, const char *optstr)
{
    QemuOpts *opts;
    QDict *qdict;
    Error *local_err = NULL;

    opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
    if (!opts) {
        return;
    }

    qdict = qemu_opts_to_qdict(opts, NULL);

    if (!qdict_get_try_str(qdict, "node-name")) {
4107
        qobject_unref(qdict);
4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123
        error_report("'node-name' needs to be specified");
        goto out;
    }

    BlockDriverState *bs = bds_tree_init(qdict, &local_err);
    if (!bs) {
        error_report_err(local_err);
        goto out;
    }

    QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);

out:
    qemu_opts_del(opts);
}

4124 4125
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
4126
    BlockDriverState *bs;
4127
    QObject *obj;
4128
    Visitor *v = qobject_output_visitor_new(&obj);
4129 4130 4131
    QDict *qdict;
    Error *local_err = NULL;

4132
    visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4133
    if (local_err) {
4134 4135 4136 4137
        error_propagate(errp, local_err);
        goto fail;
    }

4138
    visit_complete(v, &obj);
4139
    qdict = qobject_to(QDict, obj);
4140 4141 4142

    qdict_flatten(qdict);

4143 4144 4145 4146
    if (!qdict_get_try_str(qdict, "node-name")) {
        error_setg(errp, "'node-name' must be specified for the root node");
        goto fail;
    }
4147

4148 4149 4150
    bs = bds_tree_init(qdict, errp);
    if (!bs) {
        goto fail;
4151 4152
    }

4153 4154
    QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);

4155
fail:
4156
    visit_free(v);
4157 4158
}

4159
void qmp_blockdev_del(const char *node_name, Error **errp)
4160 4161 4162 4163
{
    AioContext *aio_context;
    BlockDriverState *bs;

4164 4165 4166
    bs = bdrv_find_node(node_name);
    if (!bs) {
        error_setg(errp, "Cannot find node %s", node_name);
4167 4168
        return;
    }
4169 4170 4171
    if (bdrv_has_blk(bs)) {
        error_setg(errp, "Node %s is in use", node_name);
        return;
4172
    }
4173
    aio_context = bdrv_get_aio_context(bs);
4174 4175
    aio_context_acquire(aio_context);

4176 4177 4178
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
        goto out;
    }
4179

4180 4181 4182 4183
    if (!bs->monitor_list.tqe_prev) {
        error_setg(errp, "Node %s is not owned by the monitor",
                   bs->node_name);
        goto out;
4184 4185
    }

4186 4187 4188 4189
    if (bs->refcnt > 1) {
        error_setg(errp, "Block device %s is in use",
                   bdrv_get_device_or_node_name(bs));
        goto out;
4190 4191
    }

4192 4193 4194
    QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
    bdrv_unref(bs);

4195 4196 4197 4198
out:
    aio_context_release(aio_context);
}

4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253
static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
                                  const char *child_name)
{
    BdrvChild *child;

    QLIST_FOREACH(child, &parent_bs->children, next) {
        if (strcmp(child->name, child_name) == 0) {
            return child;
        }
    }

    return NULL;
}

void qmp_x_blockdev_change(const char *parent, bool has_child,
                           const char *child, bool has_node,
                           const char *node, Error **errp)
{
    BlockDriverState *parent_bs, *new_bs = NULL;
    BdrvChild *p_child;

    parent_bs = bdrv_lookup_bs(parent, parent, errp);
    if (!parent_bs) {
        return;
    }

    if (has_child == has_node) {
        if (has_child) {
            error_setg(errp, "The parameters child and node are in conflict");
        } else {
            error_setg(errp, "Either child or node must be specified");
        }
        return;
    }

    if (has_child) {
        p_child = bdrv_find_child(parent_bs, child);
        if (!p_child) {
            error_setg(errp, "Node '%s' does not have child '%s'",
                       parent, child);
            return;
        }
        bdrv_del_child(parent_bs, p_child, errp);
    }

    if (has_node) {
        new_bs = bdrv_find_node(node);
        if (!new_bs) {
            error_setg(errp, "Node '%s' not found", node);
            return;
        }
        bdrv_add_child(parent_bs, new_bs, errp);
    }
}

4254
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4255
{
4256
    BlockJobInfoList *head = NULL, **p_next = &head;
4257
    BlockJob *job;
4258

4259
    for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4260 4261
        BlockJobInfoList *elem;
        AioContext *aio_context;
4262

4263 4264 4265 4266 4267
        if (block_job_is_internal(job)) {
            continue;
        }
        elem = g_new0(BlockJobInfoList, 1);
        aio_context = blk_get_aio_context(job->blk);
4268
        aio_context_acquire(aio_context);
4269
        elem->value = block_job_query(job, errp);
4270
        aio_context_release(aio_context);
4271 4272 4273 4274 4275
        if (!elem->value) {
            g_free(elem);
            qapi_free_BlockJobInfoList(head);
            return NULL;
        }
4276 4277
        *p_next = elem;
        p_next = &elem->next;
4278 4279
    }

4280
    return head;
4281
}
4282

4283
void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4284
                                 bool has_force, bool force, Error **errp)
4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295
{
    AioContext *old_context;
    AioContext *new_context;
    BlockDriverState *bs;

    bs = bdrv_find_node(node_name);
    if (!bs) {
        error_setg(errp, "Cannot find node %s", node_name);
        return;
    }

4296 4297 4298 4299 4300
    /* Protects against accidents. */
    if (!(has_force && force) && bdrv_has_blk(bs)) {
        error_setg(errp, "Node %s is associated with a BlockBackend and could "
                         "be in use (use force=true to override this check)",
                         node_name);
4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323
        return;
    }

    if (iothread->type == QTYPE_QSTRING) {
        IOThread *obj = iothread_by_id(iothread->u.s);
        if (!obj) {
            error_setg(errp, "Cannot find iothread %s", iothread->u.s);
            return;
        }

        new_context = iothread_get_aio_context(obj);
    } else {
        new_context = qemu_get_aio_context();
    }

    old_context = bdrv_get_aio_context(bs);
    aio_context_acquire(old_context);

    bdrv_set_aio_context(bs, new_context);

    aio_context_release(old_context);
}

4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366
void qmp_x_block_latency_histogram_set(
    const char *device,
    bool has_boundaries, uint64List *boundaries,
    bool has_boundaries_read, uint64List *boundaries_read,
    bool has_boundaries_write, uint64List *boundaries_write,
    bool has_boundaries_flush, uint64List *boundaries_flush,
    Error **errp)
{
    BlockBackend *blk = blk_by_name(device);
    BlockAcctStats *stats;

    if (!blk) {
        error_setg(errp, "Device '%s' not found", device);
        return;
    }
    stats = blk_get_stats(blk);

    if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
        !has_boundaries_flush)
    {
        block_latency_histograms_clear(stats);
        return;
    }

    if (has_boundaries || has_boundaries_read) {
        block_latency_histogram_set(
            stats, BLOCK_ACCT_READ,
            has_boundaries_read ? boundaries_read : boundaries);
    }

    if (has_boundaries || has_boundaries_write) {
        block_latency_histogram_set(
            stats, BLOCK_ACCT_WRITE,
            has_boundaries_write ? boundaries_write : boundaries);
    }

    if (has_boundaries || has_boundaries_flush) {
        block_latency_histogram_set(
            stats, BLOCK_ACCT_FLUSH,
            has_boundaries_flush ? boundaries_flush : boundaries);
    }
}

4367
QemuOptsList qemu_common_drive_opts = {
4368
    .name = "drive",
4369
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4370 4371 4372 4373 4374 4375 4376 4377 4378
    .desc = {
        {
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
        },{
            .name = "aio",
            .type = QEMU_OPT_STRING,
            .help = "host AIO implementation (threads, native)",
4379 4380 4381 4382
        },{
            .name = BDRV_OPT_CACHE_WB,
            .type = QEMU_OPT_BOOL,
            .help = "Enable writeback mode",
4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395
        },{
            .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",
        },{
4396
            .name = BDRV_OPT_READ_ONLY,
4397 4398
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
4399 4400 4401 4402 4403
        },

        THROTTLE_OPTS,

        {
4404 4405 4406
            .name = "throttling.group",
            .type = QEMU_OPT_STRING,
            .help = "name of the block throttling group",
4407 4408 4409 4410
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
4411 4412 4413 4414
        },{
            .name = "detect-zeroes",
            .type = QEMU_OPT_STRING,
            .help = "try to optimize zero writes (off, on, unmap)",
4415 4416 4417 4418 4419 4420 4421 4422 4423 4424
        },{
            .name = "stats-account-invalid",
            .type = QEMU_OPT_BOOL,
            .help = "whether to account for invalid I/O operations "
                    "in the statistics",
        },{
            .name = "stats-account-failed",
            .type = QEMU_OPT_BOOL,
            .help = "whether to account for failed I/O operations "
                    "in the statistics",
4425 4426 4427 4428
        },
        { /* end of list */ }
    },
};
4429 4430 4431 4432 4433

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
4434 4435 4436 4437
        /*
         * no elements => accept any params
         * validation will happen later
         */
4438 4439 4440
        { /* end of list */ }
    },
};
反馈
建议
客服 返回
顶部