blockdev.c 128.4 KB
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/*
 * 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.
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 *
 * 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.
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 */

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#include "qemu/osdep.h"
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#include "sysemu/block-backend.h"
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#include "sysemu/blockdev.h"
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#include "hw/block/block.h"
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#include "block/blockjob.h"
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#include "block/qdict.h"
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#include "block/throttle-groups.h"
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#include "monitor/monitor.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
#include "qemu/config-file.h"
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#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-transaction.h"
#include "qapi/qapi-visit-block-core.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qnum.h"
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#include "qapi/qmp/qstring.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/qmp/qlist.h"
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#include "qapi/qobject-output-visitor.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/iothread.h"
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#include "block/block_int.h"
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#include "block/trace.h"
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#include "sysemu/arch_init.h"
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#include "sysemu/qtest.h"
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#include "qemu/cutils.h"
#include "qemu/help_option.h"
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#include "qemu/throttle-options.h"
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static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
    QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);

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static int do_open_tray(const char *blk_name, const char *qdev_id,
                        bool force, Error **errp);
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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);
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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",
};

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static int if_max_devs[IF_COUNT] = {
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    /*
     * Do not change these numbers!  They govern how drive option
     * index maps to unit and bus.  That mapping is ABI.
     *
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     * All controllers used to implement if=T drives need to support
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     * 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,
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};

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/**
 * Boards may call this to offer board-by-board overrides
 * of the default, global values.
 */
void override_max_devs(BlockInterfaceType type, int max_devs)
{
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    BlockBackend *blk;
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    DriveInfo *dinfo;

    if (max_devs <= 0) {
        return;
    }

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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
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        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;
}

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/*
 * 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.
 */
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void blockdev_mark_auto_del(BlockBackend *blk)
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{
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    DriveInfo *dinfo = blk_legacy_dinfo(blk);
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    BlockDriverState *bs = blk_bs(blk);
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    AioContext *aio_context;
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    if (!dinfo) {
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        return;
    }

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    if (bs) {
        aio_context = bdrv_get_aio_context(bs);
        aio_context_acquire(aio_context);
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        if (bs->job) {
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            job_cancel(&bs->job->job, false);
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        }
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        aio_context_release(aio_context);
    }
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    dinfo->auto_del = 1;
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}

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void blockdev_auto_del(BlockBackend *blk)
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{
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    DriveInfo *dinfo = blk_legacy_dinfo(blk);
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    if (dinfo && dinfo->auto_del) {
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        monitor_remove_blk(blk);
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        blk_unref(blk);
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    }
}

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/**
 * 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;
}

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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;
}

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QemuOpts *drive_def(const char *optstr)
{
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    return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
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}

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

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    opts = drive_def(optstr);
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    if (!opts) {
        return NULL;
    }
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    if (type != IF_DEFAULT) {
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        qemu_opt_set(opts, "if", if_name[type], &error_abort);
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    }
    if (index >= 0) {
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        qemu_opt_set_number(opts, "index", index, &error_abort);
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    }
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    if (file)
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        qemu_opt_set(opts, "file", file, &error_abort);
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    return opts;
}

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

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    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) {
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            return dinfo;
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        }
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    }

    return NULL;
}

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void drive_check_orphaned(void)
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{
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    BlockBackend *blk;
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    DriveInfo *dinfo;
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    Location loc;
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    bool orphans = false;
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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
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        if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
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            dinfo->type != IF_NONE) {
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            loc_push_none(&loc);
            qemu_opts_loc_restore(dinfo->opts);
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            error_report("machine type does not support"
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                         " if=%s,bus=%d,unit=%d",
                         if_name[dinfo->type], dinfo->bus, dinfo->unit);
            loc_pop(&loc);
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            orphans = true;
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        }
    }

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    if (orphans) {
        exit(1);
    }
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}

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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));
}

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int drive_get_max_bus(BlockInterfaceType type)
{
    int max_bus;
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    BlockBackend *blk;
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    DriveInfo *dinfo;

    max_bus = -1;
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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
        if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
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            max_bus = dinfo->bus;
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        }
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    }
    return max_bus;
}

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/* 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]++);
}

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static void bdrv_format_print(void *opaque, const char *name)
{
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    error_printf(" %s", name);
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}

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typedef struct {
    QEMUBH *bh;
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    BlockDriverState *bs;
} BDRVPutRefBH;
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static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
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{
    if (!strcmp(buf, "ignore")) {
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        return BLOCKDEV_ON_ERROR_IGNORE;
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    } else if (!is_read && !strcmp(buf, "enospc")) {
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        return BLOCKDEV_ON_ERROR_ENOSPC;
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    } else if (!strcmp(buf, "stop")) {
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        return BLOCKDEV_ON_ERROR_STOP;
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    } else if (!strcmp(buf, "report")) {
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        return BLOCKDEV_ON_ERROR_REPORT;
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    } else {
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        error_setg(errp, "'%s' invalid %s error action",
                   buf, is_read ? "read" : "write");
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        return -1;
    }
}

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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;
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            const char *str = qstring_get_str(qobject_to(QString,
                                                         entry->value));
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            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;
        }

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

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typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;

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/* 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);
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        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);

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        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);

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

446
        if (!throttle_is_valid(throttle_cfg, errp)) {
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            return;
        }
    }

    if (detect_zeroes) {
        *detect_zeroes =
453
            qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
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                            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;
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    }

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

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

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

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

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    id = qemu_opts_id(opts);

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    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;
    }
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    extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
                                    &detect_zeroes, &error);
    if (error) {
        error_propagate(errp, error);
        goto early_err;
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    }

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
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        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

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        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);
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    }

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;
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        }
    }

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;
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        }
    }

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

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    read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);

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

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

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

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        /* 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");
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        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 = "file",
            .type = QEMU_OPT_STRING,
            .help = "file name",
737
        },
738 739 740

        /* Options that are passed on, but have special semantics with -drive */
        {
741
            .name = BDRV_OPT_READ_ONLY,
742 743
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
744 745 746 747 748 749 750 751
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
752 753 754 755 756 757
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },

758 759 760 761
        { /* end of list */ }
    },
};

762
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
763
{
764
    const char *value;
765
    BlockBackend *blk;
766
    DriveInfo *dinfo = NULL;
767
    QDict *bs_opts;
768 769
    QemuOpts *legacy_opts;
    DriveMediaType media = MEDIA_DISK;
770
    BlockInterfaceType type;
771
    int max_devs, bus_id, unit_id, index;
772
    const char *werror, *rerror;
773 774
    bool read_only = false;
    bool copy_on_read;
775
    const char *filename;
776
    Error *local_err = NULL;
777
    int i;
778

779
    /* Change legacy command line options into QMP ones */
780 781 782 783 784 785 786
    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" },
787

788 789 790
        { "bps",            "throttling.bps-total" },
        { "bps_rd",         "throttling.bps-read" },
        { "bps_wr",         "throttling.bps-write" },
791

792 793 794
        { "iops_max",       "throttling.iops-total-max" },
        { "iops_rd_max",    "throttling.iops-read-max" },
        { "iops_wr_max",    "throttling.iops-write-max" },
795

796 797 798
        { "bps_max",        "throttling.bps-total-max" },
        { "bps_rd_max",     "throttling.bps-read-max" },
        { "bps_wr_max",     "throttling.bps-write-max" },
799

800
        { "iops_size",      "throttling.iops-size" },
801

802 803
        { "group",          "throttling.group" },

804
        { "readonly",       BDRV_OPT_READ_ONLY },
805 806 807
    };

    for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
808 809 810
        qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
                        &local_err);
        if (local_err) {
811
            error_report_err(local_err);
812 813
            return NULL;
        }
814
    }
815

816 817 818
    value = qemu_opt_get(all_opts, "cache");
    if (value) {
        int flags = 0;
819
        bool writethrough;
820

821
        if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
822 823 824 825 826
            error_report("invalid cache option");
            return NULL;
        }

        /* Specific options take precedence */
827 828
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
829
                              !writethrough, &error_abort);
830
        }
831 832
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
833
                              !!(flags & BDRV_O_NOCACHE), &error_abort);
834
        }
835 836
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
837
                              !!(flags & BDRV_O_NO_FLUSH), &error_abort);
838 839 840 841
        }
        qemu_opt_unset(all_opts, "cache");
    }

842 843 844 845
    /* Get a QDict for processing the options */
    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);

846 847
    legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                   &error_abort);
848
    qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
849
    if (local_err) {
850
        error_report_err(local_err);
851 852 853 854 855 856 857 858 859 860
        goto fail;
    }

    /* 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;
861
            read_only = true;
862 863 864 865 866 867
        } else {
            error_report("'%s' invalid media", value);
            goto fail;
        }
    }

868
    /* copy-on-read is disabled with a warning for read-only devices */
869
    read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
870 871 872
    copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);

    if (read_only && copy_on_read) {
873
        warn_report("disabling copy-on-read on read-only drive");
874 875 876
        copy_on_read = false;
    }

877 878
    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");
879

880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
    /* 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;
    }

895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
    /* 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;
    }

    /* 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);
        }
948
        qdict_put_str(bs_opts, "id", new_id);
949 950 951
        g_free(new_id);
    }

952 953 954
    /* Add virtio block device */
    if (type == IF_VIRTIO) {
        QemuOpts *devopts;
955 956
        devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
                                   &error_abort);
957
        if (arch_type == QEMU_ARCH_S390X) {
958
            qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
959
        } else {
960
            qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
961
        }
962 963
        qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
                     &error_abort);
964 965
    }

966 967
    filename = qemu_opt_get(legacy_opts, "file");

968 969 970 971 972 973 974 975
    /* 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;
        }
976
        qdict_put_str(bs_opts, "werror", werror);
977 978 979 980 981 982 983 984 985
    }

    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;
        }
986
        qdict_put_str(bs_opts, "rerror", rerror);
987 988
    }

989
    /* Actual block device init: Functionality shared with blockdev-add */
990
    blk = blockdev_init(filename, bs_opts, &local_err);
991
    bs_opts = NULL;
992
    if (!blk) {
993
        if (local_err) {
994
            error_report_err(local_err);
995
        }
996
        goto fail;
997
    } else {
998
        assert(!local_err);
999 1000
    }

1001 1002
    /* Create legacy DriveInfo */
    dinfo = g_malloc0(sizeof(*dinfo));
1003
    dinfo->opts = all_opts;
1004

1005
    dinfo->type = type;
1006 1007
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
1008

1009 1010
    blk_set_legacy_dinfo(blk, dinfo);

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        dinfo->media_cd = media == MEDIA_CDROM;
        break;
    default:
        break;
    }

1022
fail:
1023
    qemu_opts_del(legacy_opts);
1024
    qobject_unref(bs_opts);
1025
    return dinfo;
1026 1027
}

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
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;
}

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
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;
}

1073
void hmp_commit(Monitor *mon, const QDict *qdict)
1074 1075
{
    const char *device = qdict_get_str(qdict, "device");
1076
    BlockBackend *blk;
1077
    int ret;
1078

1079
    if (!strcmp(device, "all")) {
1080
        ret = blk_commit_all();
1081
    } else {
1082 1083 1084
        BlockDriverState *bs;
        AioContext *aio_context;

1085 1086
        blk = blk_by_name(device);
        if (!blk) {
1087
            monitor_printf(mon, "Device '%s' not found\n", device);
1088
            return;
1089
        }
M
Max Reitz 已提交
1090 1091 1092 1093
        if (!blk_is_available(blk)) {
            monitor_printf(mon, "Device '%s' has no medium\n", device);
            return;
        }
1094 1095 1096 1097 1098 1099 1100 1101

        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);
1102 1103 1104 1105
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
1106 1107 1108
    }
}

1109
static void blockdev_do_action(TransactionAction *action, Error **errp)
1110
{
1111
    TransactionActionList list;
1112

1113
    list.value = action;
1114
    list.next = NULL;
1115
    qmp_transaction(&list, false, NULL, errp);
1116 1117
}

1118 1119 1120 1121 1122
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,
1123
                                bool has_format, const char *format,
1124
                                bool has_mode, NewImageMode mode, Error **errp)
1125
{
1126
    BlockdevSnapshotSync snapshot = {
1127
        .has_device = has_device,
1128
        .device = (char *) device,
1129 1130
        .has_node_name = has_node_name,
        .node_name = (char *) node_name,
1131
        .snapshot_file = (char *) snapshot_file,
1132 1133
        .has_snapshot_node_name = has_snapshot_node_name,
        .snapshot_node_name = (char *) snapshot_node_name,
1134 1135 1136 1137 1138
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
1139 1140
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1141
        .u.blockdev_snapshot_sync.data = &snapshot,
1142 1143
    };
    blockdev_do_action(&action, errp);
1144 1145
}

1146 1147 1148 1149 1150 1151 1152
void qmp_blockdev_snapshot(const char *node, const char *overlay,
                           Error **errp)
{
    BlockdevSnapshot snapshot_data = {
        .node = (char *) node,
        .overlay = (char *) overlay
    };
1153 1154
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1155
        .u.blockdev_snapshot.data = &snapshot_data,
1156 1157
    };
    blockdev_do_action(&action, errp);
1158 1159
}

1160 1161 1162 1163 1164 1165 1166 1167
void qmp_blockdev_snapshot_internal_sync(const char *device,
                                         const char *name,
                                         Error **errp)
{
    BlockdevSnapshotInternal snapshot = {
        .device = (char *) device,
        .name = (char *) name
    };
1168 1169
    TransactionAction action = {
        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1170
        .u.blockdev_snapshot_internal_sync.data = &snapshot,
1171 1172
    };
    blockdev_do_action(&action, errp);
1173 1174
}

1175 1176 1177 1178 1179 1180 1181
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                         bool has_id,
                                                         const char *id,
                                                         bool has_name,
                                                         const char *name,
                                                         Error **errp)
{
1182
    BlockDriverState *bs;
1183
    AioContext *aio_context;
1184 1185 1186 1187 1188
    QEMUSnapshotInfo sn;
    Error *local_err = NULL;
    SnapshotInfo *info = NULL;
    int ret;

1189 1190
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
1191 1192
        return NULL;
    }
1193
    aio_context = bdrv_get_aio_context(bs);
M
Max Reitz 已提交
1194
    aio_context_acquire(aio_context);
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205

    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
1206
        goto out_aio_context;
1207 1208
    }

1209 1210 1211 1212
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
        goto out_aio_context;
    }

1213
    ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1214
    if (local_err) {
1215
        error_propagate(errp, local_err);
1216
        goto out_aio_context;
1217 1218 1219 1220 1221 1222
    }
    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);
1223
        goto out_aio_context;
1224 1225 1226
    }

    bdrv_snapshot_delete(bs, id, name, &local_err);
1227
    if (local_err) {
1228
        error_propagate(errp, local_err);
1229
        goto out_aio_context;
1230 1231
    }

1232 1233
    aio_context_release(aio_context);

1234
    info = g_new0(SnapshotInfo, 1);
1235 1236 1237 1238 1239 1240 1241 1242 1243
    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;
1244 1245 1246 1247

out_aio_context:
    aio_context_release(aio_context);
    return NULL;
1248
}
1249

1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
/**
 * 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);
1288
        return NULL;
1289 1290 1291 1292 1293 1294 1295 1296 1297
    }

    if (pbs) {
        *pbs = bs;
    }

    return bitmap;
}

1298
/* New and old BlockDriverState structs for atomic group operations */
1299

1300
typedef struct BlkActionState BlkActionState;
1301

1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
/**
 * 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 {
1317
    size_t instance_size;
1318 1319 1320 1321 1322
    void (*prepare)(BlkActionState *common, Error **errp);
    void (*commit)(BlkActionState *common);
    void (*abort)(BlkActionState *common);
    void (*clean)(BlkActionState *common);
} BlkActionOps;
1323

1324 1325 1326 1327 1328 1329
/**
 * 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.
1330
 * @block_job_txn: Transaction which this action belongs to.
1331 1332 1333 1334 1335
 * @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.
1336
 */
1337
struct BlkActionState {
1338
    TransactionAction *action;
1339
    const BlkActionOps *ops;
1340
    JobTxn *block_job_txn;
1341
    TransactionProperties *txn_props;
1342
    QSIMPLEQ_ENTRY(BlkActionState) entry;
1343 1344
};

1345 1346
/* internal snapshot private data */
typedef struct InternalSnapshotState {
1347
    BlkActionState common;
1348 1349
    BlockDriverState *bs;
    QEMUSnapshotInfo sn;
1350
    bool created;
1351 1352
} InternalSnapshotState;

1353 1354 1355 1356 1357 1358 1359

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",
1360 1361
                   TransactionActionKind_str(s->action->type),
                   ActionCompletionMode_str(s->txn_props->completion_mode));
1362 1363 1364 1365 1366
        return -1;
    }
    return 0;
}

1367
static void internal_snapshot_prepare(BlkActionState *common,
1368 1369
                                      Error **errp)
{
1370
    Error *local_err = NULL;
1371 1372 1373 1374 1375 1376 1377 1378
    const char *device;
    const char *name;
    BlockDriverState *bs;
    QEMUSnapshotInfo old_sn, *sn;
    bool ret;
    qemu_timeval tv;
    BlockdevSnapshotInternal *internal;
    InternalSnapshotState *state;
1379
    AioContext *aio_context;
1380 1381
    int ret1;

1382
    g_assert(common->action->type ==
1383
             TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1384
    internal = common->action->u.blockdev_snapshot_internal_sync.data;
1385 1386 1387 1388 1389 1390 1391
    state = DO_UPCAST(InternalSnapshotState, common, common);

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

    /* 2. check for validation */
1392 1393 1394 1395
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1396 1397
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
1398 1399 1400
        return;
    }

1401 1402
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);
1403

1404
    state->bs = bs;
1405 1406

    /* Paired with .clean() */
1407 1408
    bdrv_drained_begin(bs);

1409
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1410
        goto out;
1411 1412
    }

1413
    if (bdrv_is_read_only(bs)) {
1414
        error_setg(errp, "Device '%s' is read only", device);
1415
        goto out;
1416 1417 1418
    }

    if (!bdrv_can_snapshot(bs)) {
1419 1420 1421
        error_setg(errp, "Block format '%s' used by device '%s' "
                   "does not support internal snapshots",
                   bs->drv->format_name, device);
1422
        goto out;
1423 1424 1425 1426
    }

    if (!strlen(name)) {
        error_setg(errp, "Name is empty");
1427
        goto out;
1428 1429 1430
    }

    /* check whether a snapshot with name exist */
1431 1432 1433 1434
    ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
                                            &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1435
        goto out;
1436 1437 1438 1439
    } else if (ret) {
        error_setg(errp,
                   "Snapshot with name '%s' already exists on device '%s'",
                   name, device);
1440
        goto out;
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
    }

    /* 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);
1456
        goto out;
1457 1458 1459
    }

    /* 4. succeed, mark a snapshot is created */
1460
    state->created = true;
1461 1462 1463

out:
    aio_context_release(aio_context);
1464 1465
}

1466
static void internal_snapshot_abort(BlkActionState *common)
1467 1468 1469 1470 1471
{
    InternalSnapshotState *state =
                             DO_UPCAST(InternalSnapshotState, common, common);
    BlockDriverState *bs = state->bs;
    QEMUSnapshotInfo *sn = &state->sn;
1472
    AioContext *aio_context;
1473 1474
    Error *local_error = NULL;

1475
    if (!state->created) {
1476 1477 1478
        return;
    }

1479 1480 1481
    aio_context = bdrv_get_aio_context(state->bs);
    aio_context_acquire(aio_context);

1482
    if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1483 1484 1485 1486 1487
        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));
1488
    }
1489 1490

    aio_context_release(aio_context);
1491 1492
}

1493
static void internal_snapshot_clean(BlkActionState *common)
1494 1495 1496
{
    InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
                                             common, common);
1497
    AioContext *aio_context;
1498

1499 1500
    if (!state->bs) {
        return;
1501
    }
1502 1503 1504 1505 1506 1507 1508

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

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1509 1510
}

1511
/* external snapshot private data */
1512
typedef struct ExternalSnapshotState {
1513
    BlkActionState common;
1514 1515
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
1516
    bool overlay_appended;
1517
} ExternalSnapshotState;
1518

1519
static void external_snapshot_prepare(BlkActionState *common,
1520 1521
                                      Error **errp)
{
1522
    int flags = 0;
1523
    QDict *options = NULL;
1524
    Error *local_err = NULL;
1525
    /* Device and node name of the image to generate the snapshot from */
1526
    const char *device;
1527
    const char *node_name;
1528 1529 1530
    /* Reference to the new image (for 'blockdev-snapshot') */
    const char *snapshot_ref;
    /* File name of the new image (for 'blockdev-snapshot-sync') */
1531
    const char *new_image_file;
1532 1533
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1534
    TransactionAction *action = common->action;
1535
    AioContext *aio_context;
1536

1537 1538 1539 1540 1541
    /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
     * purpose but a different set of parameters */
    switch (action->type) {
    case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
        {
1542
            BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1543 1544 1545 1546 1547 1548 1549 1550
            device = s->node;
            node_name = s->node;
            new_image_file = NULL;
            snapshot_ref = s->overlay;
        }
        break;
    case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
        {
1551
            BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1552 1553 1554 1555 1556 1557 1558 1559
            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();
1560 1561 1562
    }

    /* start processing */
1563 1564 1565 1566
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1567 1568
    state->old_bs = bdrv_lookup_bs(device, node_name, errp);
    if (!state->old_bs) {
1569 1570 1571
        return;
    }

1572 1573 1574 1575
    aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(aio_context);

    /* Paired with .clean() */
1576
    bdrv_drained_begin(state->old_bs);
1577

1578
    if (!bdrv_is_inserted(state->old_bs)) {
1579
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1580
        goto out;
1581 1582
    }

1583 1584
    if (bdrv_op_is_blocked(state->old_bs,
                           BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1585
        goto out;
1586 1587
    }

1588 1589
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
1590
            error_setg(errp, QERR_IO_ERROR);
1591
            goto out;
1592 1593 1594
        }
    }

1595
    if (!bdrv_is_first_non_filter(state->old_bs)) {
1596
        error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1597
        goto out;
1598 1599
    }

1600
    if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1601
        BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1602 1603 1604 1605
        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;
1606

1607 1608
        if (node_name && !snapshot_node_name) {
            error_setg(errp, "New snapshot node name missing");
1609
            goto out;
1610 1611
        }

1612 1613 1614
        if (snapshot_node_name &&
            bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
            error_setg(errp, "New snapshot node name already in use");
1615
            goto out;
1616 1617 1618
        }

        flags = state->old_bs->open_flags;
1619 1620
        flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
        flags |= BDRV_O_NO_BACKING;
1621 1622 1623 1624

        /* create new image w/backing file */
        mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
        if (mode != NEW_IMAGE_MODE_EXISTING) {
1625 1626 1627
            int64_t size = bdrv_getlength(state->old_bs);
            if (size < 0) {
                error_setg_errno(errp, -size, "bdrv_getlength failed");
1628
                goto out;
1629
            }
1630 1631 1632
            bdrv_img_create(new_image_file, format,
                            state->old_bs->filename,
                            state->old_bs->drv->format_name,
1633
                            NULL, size, flags, false, &local_err);
1634 1635
            if (local_err) {
                error_propagate(errp, local_err);
1636
                goto out;
1637 1638 1639 1640 1641
            }
        }

        options = qdict_new();
        if (s->has_snapshot_node_name) {
1642
            qdict_put_str(options, "node-name", snapshot_node_name);
1643
        }
1644
        qdict_put_str(options, "driver", format);
1645 1646
    }

1647 1648
    state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
                              errp);
1649
    /* We will manually add the backing_hd field to the bs later */
1650
    if (!state->new_bs) {
1651
        goto out;
1652 1653
    }

1654
    if (bdrv_has_blk(state->new_bs)) {
1655
        error_setg(errp, "The snapshot is already in use");
1656
        goto out;
1657 1658 1659 1660
    }

    if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
                           errp)) {
1661
        goto out;
1662 1663 1664 1665
    }

    if (state->new_bs->backing != NULL) {
        error_setg(errp, "The snapshot already has a backing image");
1666
        goto out;
1667 1668 1669 1670
    }

    if (!state->new_bs->drv->supports_backing) {
        error_setg(errp, "The snapshot does not support backing images");
1671
        goto out;
1672 1673
    }

1674
    bdrv_set_aio_context(state->new_bs, aio_context);
1675

1676 1677 1678 1679 1680 1681 1682
    /* 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);
1683
        goto out;
1684
    }
1685
    state->overlay_appended = true;
1686 1687 1688

out:
    aio_context_release(aio_context);
1689 1690
}

1691
static void external_snapshot_commit(BlkActionState *common)
1692
{
1693 1694
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1695 1696 1697 1698
    AioContext *aio_context;

    aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(aio_context);
1699

1700 1701 1702
    /* 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 */
1703
    if (!atomic_read(&state->old_bs->copy_on_read)) {
1704 1705 1706
        bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
                    NULL);
    }
1707 1708

    aio_context_release(aio_context);
1709 1710
}

1711
static void external_snapshot_abort(BlkActionState *common)
1712
{
1713 1714 1715
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
1716
        if (state->overlay_appended) {
1717 1718 1719 1720 1721
            AioContext *aio_context;

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

1722 1723 1724
            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);
1725
            bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1726
            bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1727 1728

            aio_context_release(aio_context);
1729
        }
1730
    }
1731 1732
}

1733
static void external_snapshot_clean(BlkActionState *common)
1734 1735 1736
{
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1737 1738 1739 1740
    AioContext *aio_context;

    if (!state->old_bs) {
        return;
1741
    }
1742 1743 1744 1745 1746 1747 1748 1749

    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);
1750 1751
}

1752
typedef struct DriveBackupState {
1753
    BlkActionState common;
1754 1755 1756 1757
    BlockDriverState *bs;
    BlockJob *job;
} DriveBackupState;

1758
static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1759
                            Error **errp);
1760

1761
static void drive_backup_prepare(BlkActionState *common, Error **errp)
1762 1763
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1764
    BlockDriverState *bs;
1765
    DriveBackup *backup;
1766
    AioContext *aio_context;
1767 1768
    Error *local_err = NULL;

1769
    assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1770
    backup = common->action->u.drive_backup.data;
1771

1772 1773
    bs = qmp_get_root_bs(backup->device, errp);
    if (!bs) {
1774 1775 1776
        return;
    }

1777 1778 1779 1780
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    /* Paired with .clean() */
1781
    bdrv_drained_begin(bs);
1782

1783
    state->bs = bs;
1784

1785
    state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1786
    if (local_err) {
1787
        error_propagate(errp, local_err);
1788
        goto out;
1789
    }
1790 1791 1792

out:
    aio_context_release(aio_context);
1793
}
1794

1795 1796 1797
static void drive_backup_commit(BlkActionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1798 1799 1800 1801 1802
    AioContext *aio_context;

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

1803
    assert(state->job);
1804
    job_start(&state->job->job);
1805 1806

    aio_context_release(aio_context);
1807 1808
}

1809
static void drive_backup_abort(BlkActionState *common)
1810 1811 1812
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);

1813
    if (state->job) {
1814 1815 1816 1817 1818
        AioContext *aio_context;

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

1819
        job_cancel_sync(&state->job->job);
1820 1821

        aio_context_release(aio_context);
1822 1823 1824
    }
}

1825
static void drive_backup_clean(BlkActionState *common)
1826 1827
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1828
    AioContext *aio_context;
1829

1830 1831
    if (!state->bs) {
        return;
1832
    }
1833 1834 1835 1836 1837 1838 1839

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

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1840 1841
}

1842
typedef struct BlockdevBackupState {
1843
    BlkActionState common;
1844 1845 1846 1847
    BlockDriverState *bs;
    BlockJob *job;
} BlockdevBackupState;

1848
static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1849
                                    Error **errp);
1850

1851
static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1852 1853 1854
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
    BlockdevBackup *backup;
1855
    BlockDriverState *bs, *target;
1856
    AioContext *aio_context;
1857 1858
    Error *local_err = NULL;

1859
    assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1860
    backup = common->action->u.blockdev_backup.data;
1861

1862
    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1863
    if (!bs) {
1864 1865 1866
        return;
    }

1867
    target = bdrv_lookup_bs(backup->target, backup->target, errp);
M
Max Reitz 已提交
1868
    if (!target) {
1869 1870 1871
        return;
    }

1872 1873
    aio_context = bdrv_get_aio_context(bs);
    if (aio_context != bdrv_get_aio_context(target)) {
1874 1875 1876
        error_setg(errp, "Backup between two IO threads is not implemented");
        return;
    }
1877
    aio_context_acquire(aio_context);
1878
    state->bs = bs;
1879 1880

    /* Paired with .clean() */
1881
    bdrv_drained_begin(state->bs);
1882

1883
    state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1884 1885
    if (local_err) {
        error_propagate(errp, local_err);
1886
        goto out;
1887
    }
1888 1889 1890

out:
    aio_context_release(aio_context);
1891
}
1892

1893 1894 1895
static void blockdev_backup_commit(BlkActionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1896 1897 1898 1899 1900
    AioContext *aio_context;

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

1901
    assert(state->job);
1902
    job_start(&state->job->job);
1903 1904

    aio_context_release(aio_context);
1905 1906
}

1907
static void blockdev_backup_abort(BlkActionState *common)
1908 1909 1910
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);

1911
    if (state->job) {
1912 1913 1914 1915 1916
        AioContext *aio_context;

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

1917
        job_cancel_sync(&state->job->job);
1918 1919

        aio_context_release(aio_context);
1920 1921 1922
    }
}

1923
static void blockdev_backup_clean(BlkActionState *common)
1924 1925
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1926
    AioContext *aio_context;
1927

1928 1929
    if (!state->bs) {
        return;
1930
    }
1931 1932 1933 1934 1935 1936 1937

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

    bdrv_drained_end(state->bs);

    aio_context_release(aio_context);
1938 1939
}

F
Fam Zheng 已提交
1940
typedef struct BlockDirtyBitmapState {
1941
    BlkActionState common;
F
Fam Zheng 已提交
1942 1943 1944 1945
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;
    HBitmap *backup;
    bool prepared;
1946
    bool was_enabled;
F
Fam Zheng 已提交
1947 1948
} BlockDirtyBitmapState;

1949
static void block_dirty_bitmap_add_prepare(BlkActionState *common,
F
Fam Zheng 已提交
1950 1951 1952 1953 1954 1955 1956
                                           Error **errp)
{
    Error *local_err = NULL;
    BlockDirtyBitmapAdd *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

1957 1958 1959 1960
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

1961
    action = common->action->u.block_dirty_bitmap_add.data;
F
Fam Zheng 已提交
1962 1963 1964
    /* 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,
1965
                               action->has_persistent, action->persistent,
1966
                               action->has_autoload, action->autoload,
1967
                               action->has_x_disabled, action->x_disabled,
F
Fam Zheng 已提交
1968 1969 1970 1971 1972 1973 1974 1975 1976
                               &local_err);

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

1977
static void block_dirty_bitmap_add_abort(BlkActionState *common)
F
Fam Zheng 已提交
1978 1979 1980 1981 1982
{
    BlockDirtyBitmapAdd *action;
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

1983
    action = common->action->u.block_dirty_bitmap_add.data;
F
Fam Zheng 已提交
1984 1985 1986 1987 1988 1989 1990 1991
    /* 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);
    }
}

1992
static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
F
Fam Zheng 已提交
1993 1994 1995 1996 1997 1998
                                             Error **errp)
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);
    BlockDirtyBitmap *action;

1999 2000 2001 2002
    if (action_check_completion_mode(common, errp) < 0) {
        return;
    }

2003
    action = common->action->u.block_dirty_bitmap_clear.data;
F
Fam Zheng 已提交
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
    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;
2015 2016 2017
    } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
        error_setg(errp, "Cannot modify a locked bitmap");
        return;
F
Fam Zheng 已提交
2018 2019 2020
    } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
        error_setg(errp, "Cannot clear a disabled bitmap");
        return;
2021 2022 2023
    } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
        error_setg(errp, "Cannot clear a readonly bitmap");
        return;
F
Fam Zheng 已提交
2024 2025 2026 2027 2028
    }

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

2029
static void block_dirty_bitmap_clear_abort(BlkActionState *common)
F
Fam Zheng 已提交
2030 2031 2032 2033
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

2034 2035 2036
    if (state->backup) {
        bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
    }
F
Fam Zheng 已提交
2037 2038
}

2039
static void block_dirty_bitmap_clear_commit(BlkActionState *common)
F
Fam Zheng 已提交
2040 2041 2042 2043 2044 2045 2046
{
    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                             common, common);

    hbitmap_free(state->backup);
}

2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
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);
    }
}

2115
static void abort_prepare(BlkActionState *common, Error **errp)
2116 2117 2118 2119
{
    error_setg(errp, "Transaction aborted using Abort action");
}

2120
static void abort_commit(BlkActionState *common)
2121
{
2122
    g_assert_not_reached(); /* this action never succeeds */
2123 2124
}

2125
static const BlkActionOps actions[] = {
2126 2127 2128 2129 2130
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
        .instance_size = sizeof(ExternalSnapshotState),
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
2131
        .clean = external_snapshot_clean,
2132
    },
2133
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2134
        .instance_size = sizeof(ExternalSnapshotState),
2135 2136 2137
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
2138
        .clean = external_snapshot_clean,
2139
    },
2140 2141 2142
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
2143
        .commit = drive_backup_commit,
2144
        .abort = drive_backup_abort,
2145
        .clean = drive_backup_clean,
2146
    },
2147 2148 2149
    [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
        .instance_size = sizeof(BlockdevBackupState),
        .prepare = blockdev_backup_prepare,
2150
        .commit = blockdev_backup_commit,
2151 2152 2153
        .abort = blockdev_backup_abort,
        .clean = blockdev_backup_clean,
    },
2154
    [TRANSACTION_ACTION_KIND_ABORT] = {
2155
        .instance_size = sizeof(BlkActionState),
2156 2157 2158
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
2159 2160 2161 2162
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
        .instance_size = sizeof(InternalSnapshotState),
        .prepare  = internal_snapshot_prepare,
        .abort = internal_snapshot_abort,
2163
        .clean = internal_snapshot_clean,
2164
    },
F
Fam Zheng 已提交
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174
    [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,
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185
    },
    [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,
     }
2186 2187
};

2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206
/**
 * 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;
}

2207
/*
2208 2209
 * 'Atomic' group operations.  The operations are performed as a set, and if
 * any fail then we roll back all operations in the group.
2210
 */
2211 2212 2213 2214
void qmp_transaction(TransactionActionList *dev_list,
                     bool has_props,
                     struct TransactionProperties *props,
                     Error **errp)
2215
{
2216
    TransactionActionList *dev_entry = dev_list;
2217
    JobTxn *block_job_txn = NULL;
2218
    BlkActionState *state, *next;
2219
    Error *local_err = NULL;
2220

2221
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2222 2223
    QSIMPLEQ_INIT(&snap_bdrv_states);

2224
    /* Does this transaction get canceled as a group on failure?
2225
     * If not, we don't really need to make a JobTxn.
2226 2227 2228
     */
    props = get_transaction_properties(props);
    if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2229
        block_job_txn = job_txn_new();
2230 2231
    }

2232
    /* drain all i/o before any operations */
2233 2234
    bdrv_drain_all();

2235
    /* We don't do anything in this loop that commits us to the operations */
2236
    while (NULL != dev_entry) {
2237
        TransactionAction *dev_info = NULL;
2238
        const BlkActionOps *ops;
2239

2240 2241 2242
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

2243
        assert(dev_info->type < ARRAY_SIZE(actions));
2244

2245
        ops = &actions[dev_info->type];
2246 2247
        assert(ops->instance_size > 0);

2248 2249 2250
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
2251 2252
        state->block_job_txn = block_job_txn;
        state->txn_props = props;
2253
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2254

2255
        state->ops->prepare(state, &local_err);
2256
        if (local_err) {
2257 2258
            error_propagate(errp, local_err);
            goto delete_and_fail;
2259 2260 2261
        }
    }

2262
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2263 2264 2265
        if (state->ops->commit) {
            state->ops->commit(state);
        }
2266 2267 2268 2269 2270 2271
    }

    /* success */
    goto exit;

delete_and_fail:
2272
    /* failure, and it is all-or-none; roll back all operations */
2273 2274 2275
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
2276
        }
2277 2278
    }
exit:
2279 2280 2281
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
2282
        }
2283
        g_free(state);
2284
    }
2285 2286 2287
    if (!has_props) {
        qapi_free_TransactionProperties(props);
    }
2288
    job_txn_unref(block_job_txn);
2289 2290
}

2291 2292 2293
void qmp_eject(bool has_device, const char *device,
               bool has_id, const char *id,
               bool has_force, bool force, Error **errp)
2294
{
2295
    Error *local_err = NULL;
2296 2297 2298 2299 2300
    int rc;

    if (!has_force) {
        force = false;
    }
2301

2302 2303 2304
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      force, &local_err);
2305
    if (rc && rc != -ENOSYS) {
2306
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
2307
        return;
2308
    }
2309
    error_free(local_err);
2310

2311
    blockdev_remove_medium(has_device, device, has_id, id, errp);
2312 2313
}

2314 2315 2316
void qmp_block_passwd(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      const char *password, Error **errp)
2317
{
2318 2319
    error_setg(errp,
               "Setting block passwords directly is no longer supported");
2320 2321
}

2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
/*
 * 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.
2332
 */
2333 2334
static int do_open_tray(const char *blk_name, const char *qdev_id,
                        bool force, Error **errp)
2335 2336
{
    BlockBackend *blk;
2337
    const char *device = qdev_id ?: blk_name;
2338 2339
    bool locked;

2340
    blk = qmp_get_blk(blk_name, qdev_id, errp);
2341
    if (!blk) {
2342
        return -ENODEV;
2343 2344 2345 2346
    }

    if (!blk_dev_has_removable_media(blk)) {
        error_setg(errp, "Device '%s' is not removable", device);
2347
        return -ENOTSUP;
2348 2349
    }

2350
    if (!blk_dev_has_tray(blk)) {
2351 2352
        error_setg(errp, "Device '%s' does not have a tray", device);
        return -ENOSYS;
2353 2354
    }

2355
    if (blk_dev_is_tray_open(blk)) {
2356
        return 0;
2357 2358 2359 2360 2361 2362 2363 2364
    }

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

    if (!locked || force) {
2365
        blk_dev_change_media_cb(blk, false, &error_abort);
2366
    }
2367 2368

    if (locked && !force) {
2369 2370 2371
        error_setg(errp, "Device '%s' is locked and force was not specified, "
                   "wait for tray to open and try again", device);
        return -EINPROGRESS;
2372 2373 2374 2375 2376
    }

    return 0;
}

2377 2378 2379
void qmp_blockdev_open_tray(bool has_device, const char *device,
                            bool has_id, const char *id,
                            bool has_force, bool force,
2380 2381
                            Error **errp)
{
2382 2383 2384
    Error *local_err = NULL;
    int rc;

2385 2386 2387
    if (!has_force) {
        force = false;
    }
2388 2389 2390
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      force, &local_err);
2391 2392 2393 2394 2395
    if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
        error_propagate(errp, local_err);
        return;
    }
    error_free(local_err);
2396 2397
}

2398 2399 2400
void qmp_blockdev_close_tray(bool has_device, const char *device,
                             bool has_id, const char *id,
                             Error **errp)
2401 2402
{
    BlockBackend *blk;
2403
    Error *local_err = NULL;
2404

2405 2406 2407 2408
    device = has_device ? device : NULL;
    id = has_id ? id : NULL;

    blk = qmp_get_blk(device, id, errp);
2409 2410 2411 2412 2413
    if (!blk) {
        return;
    }

    if (!blk_dev_has_removable_media(blk)) {
2414
        error_setg(errp, "Device '%s' is not removable", device ?: id);
2415 2416 2417
        return;
    }

2418 2419 2420 2421 2422
    if (!blk_dev_has_tray(blk)) {
        /* Ignore this command on tray-less devices */
        return;
    }

2423 2424 2425 2426
    if (!blk_dev_is_tray_open(blk)) {
        return;
    }

2427 2428 2429 2430 2431
    blk_dev_change_media_cb(blk, true, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }
2432 2433
}

2434 2435
static void blockdev_remove_medium(bool has_device, const char *device,
                                   bool has_id, const char *id, Error **errp)
2436 2437 2438 2439
{
    BlockBackend *blk;
    BlockDriverState *bs;
    AioContext *aio_context;
2440
    bool has_attached_device;
2441

2442 2443 2444 2445
    device = has_device ? device : NULL;
    id = has_id ? id : NULL;

    blk = qmp_get_blk(device, id, errp);
2446 2447 2448 2449 2450
    if (!blk) {
        return;
    }

    /* For BBs without a device, we can exchange the BDS tree at will */
2451
    has_attached_device = blk_get_attached_dev(blk);
2452

2453 2454
    if (has_attached_device && !blk_dev_has_removable_media(blk)) {
        error_setg(errp, "Device '%s' is not removable", device ?: id);
2455 2456 2457
        return;
    }

2458 2459 2460 2461
    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);
2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
        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);

2479 2480 2481 2482 2483
    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). */
2484
        blk_dev_change_media_cb(blk, false, &error_abort);
2485 2486
    }

2487 2488 2489 2490
out:
    aio_context_release(aio_context);
}

2491
void qmp_blockdev_remove_medium(const char *id, Error **errp)
2492 2493 2494 2495
{
    blockdev_remove_medium(false, NULL, true, id, errp);
}

2496
static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2497 2498
                                            BlockDriverState *bs, Error **errp)
{
2499
    Error *local_err = NULL;
2500
    bool has_device;
2501
    int ret;
2502 2503 2504 2505 2506

    /* 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)) {
2507
        error_setg(errp, "Device is not removable");
2508 2509 2510
        return;
    }

2511
    if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2512
        error_setg(errp, "Tray of the device is not open");
2513 2514 2515 2516
        return;
    }

    if (blk_bs(blk)) {
2517
        error_setg(errp, "There already is a medium in the device");
2518 2519 2520
        return;
    }

2521 2522 2523 2524
    ret = blk_insert_bs(blk, bs, errp);
    if (ret < 0) {
        return;
    }
2525

2526 2527 2528 2529 2530 2531
    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). */
2532 2533 2534 2535 2536 2537
        blk_dev_change_media_cb(blk, true, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            blk_remove_bs(blk);
            return;
        }
2538
    }
2539 2540
}

2541 2542 2543
static void blockdev_insert_medium(bool has_device, const char *device,
                                   bool has_id, const char *id,
                                   const char *node_name, Error **errp)
2544
{
2545
    BlockBackend *blk;
2546 2547
    BlockDriverState *bs;

2548 2549 2550 2551 2552 2553 2554
    blk = qmp_get_blk(has_device ? device : NULL,
                      has_id ? id : NULL,
                      errp);
    if (!blk) {
        return;
    }

2555 2556 2557 2558 2559 2560
    bs = bdrv_find_node(node_name);
    if (!bs) {
        error_setg(errp, "Node '%s' not found", node_name);
        return;
    }

2561
    if (bdrv_has_blk(bs)) {
2562
        error_setg(errp, "Node '%s' is already in use", node_name);
2563 2564 2565
        return;
    }

2566
    qmp_blockdev_insert_anon_medium(blk, bs, errp);
2567 2568
}

2569 2570
void qmp_blockdev_insert_medium(const char *id, const char *node_name,
                                Error **errp)
2571 2572 2573 2574
{
    blockdev_insert_medium(false, NULL, true, id, node_name, errp);
}

2575 2576 2577
void qmp_blockdev_change_medium(bool has_device, const char *device,
                                bool has_id, const char *id,
                                const char *filename,
2578
                                bool has_format, const char *format,
2579 2580
                                bool has_read_only,
                                BlockdevChangeReadOnlyMode read_only,
2581
                                Error **errp)
2582 2583 2584
{
    BlockBackend *blk;
    BlockDriverState *medium_bs = NULL;
2585
    int bdrv_flags;
2586
    bool detect_zeroes;
2587
    int rc;
2588 2589 2590
    QDict *options = NULL;
    Error *err = NULL;

2591 2592 2593
    blk = qmp_get_blk(has_device ? device : NULL,
                      has_id ? id : NULL,
                      errp);
2594 2595 2596 2597 2598 2599 2600 2601 2602
    if (!blk) {
        goto fail;
    }

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

    bdrv_flags = blk_get_open_flags_from_root_state(blk);
2603 2604
    bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
        BDRV_O_PROTOCOL);
2605

2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625
    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();
    }

2626 2627
    options = qdict_new();
    detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2628
    qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2629

2630
    if (has_format) {
2631
        qdict_put_str(options, "driver", format);
2632 2633
    }

2634 2635
    medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
    if (!medium_bs) {
2636 2637 2638
        goto fail;
    }

2639 2640 2641
    rc = do_open_tray(has_device ? device : NULL,
                      has_id ? id : NULL,
                      false, &err);
2642
    if (rc && rc != -ENOSYS) {
2643 2644 2645
        error_propagate(errp, err);
        goto fail;
    }
2646 2647
    error_free(err);
    err = NULL;
2648

2649
    blockdev_remove_medium(has_device, device, has_id, id, &err);
2650 2651 2652 2653 2654
    if (err) {
        error_propagate(errp, err);
        goto fail;
    }

2655
    qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2656 2657 2658 2659 2660
    if (err) {
        error_propagate(errp, err);
        goto fail;
    }

2661
    qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2662 2663 2664 2665 2666 2667 2668 2669

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);
}

2670
/* throttling disk I/O limits */
2671
void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2672
{
2673
    ThrottleConfig cfg;
2674
    BlockDriverState *bs;
2675
    BlockBackend *blk;
2676
    AioContext *aio_context;
2677

2678 2679 2680
    blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
                      arg->has_id ? arg->id : NULL,
                      errp);
2681
    if (!blk) {
2682
        return;
2683
    }
M
Max Reitz 已提交
2684 2685 2686 2687

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

2688
    bs = blk_bs(blk);
M
Max Reitz 已提交
2689
    if (!bs) {
2690
        error_setg(errp, "Device has no medium");
M
Max Reitz 已提交
2691 2692
        goto out;
    }
2693

2694
    throttle_config_init(&cfg);
2695 2696 2697
    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;
2698

2699 2700 2701
    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;
2702

2703 2704
    if (arg->has_bps_max) {
        cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2705
    }
2706 2707
    if (arg->has_bps_rd_max) {
        cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2708
    }
2709 2710
    if (arg->has_bps_wr_max) {
        cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2711
    }
2712 2713
    if (arg->has_iops_max) {
        cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2714
    }
2715 2716
    if (arg->has_iops_rd_max) {
        cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2717
    }
2718 2719
    if (arg->has_iops_wr_max) {
        cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2720
    }
2721

2722 2723
    if (arg->has_bps_max_length) {
        cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2724
    }
2725 2726
    if (arg->has_bps_rd_max_length) {
        cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2727
    }
2728 2729
    if (arg->has_bps_wr_max_length) {
        cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2730
    }
2731 2732
    if (arg->has_iops_max_length) {
        cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2733
    }
2734 2735
    if (arg->has_iops_rd_max_length) {
        cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2736
    }
2737 2738
    if (arg->has_iops_wr_max_length) {
        cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2739 2740
    }

2741 2742
    if (arg->has_iops_size) {
        cfg.op_size = arg->iops_size;
2743
    }
2744

2745
    if (!throttle_is_valid(&cfg, errp)) {
M
Max Reitz 已提交
2746
        goto out;
2747 2748
    }

2749 2750 2751
    if (throttle_enabled(&cfg)) {
        /* Enable I/O limits if they're not enabled yet, otherwise
         * just update the throttling group. */
2752
        if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2753
            blk_io_limits_enable(blk,
2754 2755 2756
                                 arg->has_group ? arg->group :
                                 arg->has_device ? arg->device :
                                 arg->id);
2757 2758
        } else if (arg->has_group) {
            blk_io_limits_update_group(blk, arg->group);
2759 2760
        }
        /* Set the new throttling configuration */
2761
        blk_set_io_limits(blk, &cfg);
2762
    } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2763
        /* If all throttling settings are set to 0, disable I/O limits */
2764
        blk_io_limits_disable(blk);
2765
    }
2766

M
Max Reitz 已提交
2767
out:
2768
    aio_context_release(aio_context);
2769 2770
}

2771 2772
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
                                bool has_granularity, uint32_t granularity,
2773
                                bool has_persistent, bool persistent,
2774
                                bool has_autoload, bool autoload,
2775
                                bool has_disabled, bool disabled,
2776 2777 2778
                                Error **errp)
{
    BlockDriverState *bs;
2779
    BdrvDirtyBitmap *bitmap;
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794

    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");
2795
            return;
2796 2797 2798 2799 2800 2801
        }
    } else {
        /* Default to cluster size, if available: */
        granularity = bdrv_get_default_bitmap_granularity(bs);
    }

2802 2803 2804
    if (!has_persistent) {
        persistent = false;
    }
2805

2806 2807
    if (has_autoload) {
        warn_report("Autoload option is deprecated and its value is ignored");
2808
    }
2809

2810 2811 2812 2813
    if (!has_disabled) {
        disabled = false;
    }

2814 2815 2816 2817 2818 2819 2820
    if (persistent &&
        !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
    {
        return;
    }

    bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2821 2822
    if (bitmap == NULL) {
        return;
2823
    }
2824

2825 2826 2827 2828
    if (disabled) {
        bdrv_disable_dirty_bitmap(bitmap);
    }

2829
    bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2830 2831 2832 2833 2834 2835 2836
}

void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
                                   Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;
2837
    Error *local_err = NULL;
2838

2839
    bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2840 2841 2842 2843
    if (!bitmap || !bs) {
        return;
    }

2844 2845 2846 2847
    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be removed",
                   name);
2848
        return;
2849 2850 2851 2852 2853
    } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently locked and cannot be removed",
                   name);
        return;
2854
    }
2855 2856 2857 2858 2859 2860 2861 2862 2863

    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;
        }
    }

2864 2865 2866
    bdrv_release_dirty_bitmap(bs, bitmap);
}

2867 2868 2869 2870 2871 2872 2873 2874 2875 2876
/**
 * 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;

2877
    bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2878 2879 2880 2881 2882 2883 2884 2885
    if (!bitmap || !bs) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be modified",
                   name);
2886
        return;
2887 2888 2889 2890 2891
    } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently locked and cannot be modified",
                   name);
        return;
2892 2893 2894 2895
    } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently disabled and cannot be cleared",
                   name);
2896
        return;
2897 2898 2899
    } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
        error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
        return;
2900 2901
    }

F
Fam Zheng 已提交
2902
    bdrv_clear_dirty_bitmap(bitmap, NULL);
2903 2904
}

2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946
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);
}

2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976
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);
}

2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001
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;
}

3002
void hmp_drive_del(Monitor *mon, const QDict *qdict)
3003 3004
{
    const char *id = qdict_get_str(qdict, "id");
3005
    BlockBackend *blk;
3006
    BlockDriverState *bs;
3007
    AioContext *aio_context;
3008
    Error *local_err = NULL;
3009

3010 3011
    bs = bdrv_find_node(id);
    if (bs) {
3012
        qmp_blockdev_del(id, &local_err);
3013 3014 3015 3016 3017 3018
        if (local_err) {
            error_report_err(local_err);
        }
        return;
    }

3019 3020
    blk = blk_by_name(id);
    if (!blk) {
3021
        error_report("Device '%s' not found", id);
3022
        return;
3023
    }
3024

3025
    if (!blk_legacy_dinfo(blk)) {
3026 3027
        error_report("Deleting device added with blockdev-add"
                     " is not supported");
3028
        return;
3029 3030
    }

M
Max Reitz 已提交
3031
    aio_context = blk_get_aio_context(blk);
3032 3033
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
3034 3035 3036 3037 3038 3039 3040
    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;
        }
3041

3042
        blk_remove_bs(blk);
M
Max Reitz 已提交
3043
    }
3044

3045
    /* Make the BlockBackend and the attached BlockDriverState anonymous */
3046 3047
    monitor_remove_blk(blk);

3048 3049
    /* 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.
3050
     */
3051
    if (blk_get_attached_dev(blk)) {
3052
        /* Further I/O must not pause the guest */
3053 3054
        blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
                         BLOCKDEV_ON_ERROR_REPORT);
3055
    } else {
3056
        blk_unref(blk);
3057 3058
    }

3059
    aio_context_release(aio_context);
3060
}
3061

3062 3063 3064
void qmp_block_resize(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      int64_t size, Error **errp)
3065
{
3066
    Error *local_err = NULL;
3067
    BlockBackend *blk = NULL;
3068
    BlockDriverState *bs;
3069
    AioContext *aio_context;
3070
    int ret;
3071

3072 3073 3074
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
3075
    if (local_err) {
3076 3077 3078 3079
        error_propagate(errp, local_err);
        return;
    }

3080 3081 3082
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

3083
    if (!bdrv_is_first_non_filter(bs)) {
3084
        error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3085
        goto out;
3086 3087 3088
    }

    if (size < 0) {
3089
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3090
        goto out;
3091 3092
    }

3093
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3094
        error_setg(errp, QERR_DEVICE_IN_USE, device);
3095
        goto out;
3096 3097
    }

3098
    blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3099 3100 3101 3102
    ret = blk_insert_bs(blk, bs, errp);
    if (ret < 0) {
        goto out;
    }
3103

3104
    bdrv_drained_begin(bs);
3105
    ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3106
    bdrv_drained_end(bs);
3107 3108

out:
3109
    blk_unref(blk);
3110
    aio_context_release(aio_context);
3111
}
3112

3113
void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3114
                      bool has_base, const char *base,
3115
                      bool has_base_node, const char *base_node,
3116 3117
                      bool has_backing_file, const char *backing_file,
                      bool has_speed, int64_t speed,
3118 3119
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
3120
{
3121
    BlockDriverState *bs, *iter;
3122
    BlockDriverState *base_bs = NULL;
3123
    AioContext *aio_context;
3124
    Error *local_err = NULL;
3125
    const char *base_name = NULL;
3126
    int job_flags = JOB_DEFAULT;
3127

3128 3129 3130 3131
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

3132
    bs = bdrv_lookup_bs(device, device, errp);
3133
    if (!bs) {
3134 3135 3136
        return;
    }

3137
    aio_context = bdrv_get_aio_context(bs);
3138 3139
    aio_context_acquire(aio_context);

3140 3141 3142 3143 3144 3145
    if (has_base && has_base_node) {
        error_setg(errp, "'base' and 'base-node' cannot be specified "
                   "at the same time");
        goto out;
    }

3146
    if (has_base) {
3147 3148
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
3149
            error_setg(errp, QERR_BASE_NOT_FOUND, base);
3150
            goto out;
3151
        }
3152
        assert(bdrv_get_aio_context(base_bs) == aio_context);
3153
        base_name = base;
3154 3155
    }

3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169
    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;
    }

3170 3171 3172 3173 3174 3175 3176
    /* 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;
        }
    }

3177 3178 3179 3180 3181
    /* 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");
3182
        goto out;
3183 3184 3185 3186 3187
    }

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

3188
    stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3189
                 job_flags, has_speed ? speed : 0, on_error, &local_err);
3190
    if (local_err) {
3191
        error_propagate(errp, local_err);
3192
        goto out;
3193 3194 3195
    }

    trace_qmp_block_stream(bs, bs->job);
3196 3197 3198

out:
    aio_context_release(aio_context);
3199
}
3200

3201
void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3202 3203
                      bool has_base, const char *base,
                      bool has_top, const char *top,
3204
                      bool has_backing_file, const char *backing_file,
3205
                      bool has_speed, int64_t speed,
3206
                      bool has_filter_node_name, const char *filter_node_name,
3207 3208 3209
                      Error **errp)
{
    BlockDriverState *bs;
3210
    BlockDriverState *iter;
3211
    BlockDriverState *base_bs, *top_bs;
3212
    AioContext *aio_context;
3213 3214 3215 3216
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
3217
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3218
    int job_flags = JOB_DEFAULT;
3219

3220 3221 3222
    if (!has_speed) {
        speed = 0;
    }
3223 3224 3225
    if (!has_filter_node_name) {
        filter_node_name = NULL;
    }
3226

3227 3228 3229 3230 3231
    /* 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. */
3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
    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);
        }
3242
        return;
3243 3244
    }

3245
    aio_context = bdrv_get_aio_context(bs);
3246 3247
    aio_context_acquire(aio_context);

3248
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3249
        goto out;
3250 3251 3252 3253 3254
    }

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

3255
    if (has_top && top) {
3256 3257 3258 3259 3260 3261 3262
        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");
3263
        goto out;
3264 3265
    }

3266 3267
    assert(bdrv_get_aio_context(top_bs) == aio_context);

3268 3269 3270 3271 3272 3273 3274
    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) {
3275
        error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3276
        goto out;
3277 3278
    }

3279 3280
    assert(bdrv_get_aio_context(base_bs) == aio_context);

3281 3282 3283 3284
    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;
        }
3285 3286
    }

3287 3288 3289
    /* Do not allow attempts to commit an image into itself */
    if (top_bs == base_bs) {
        error_setg(errp, "cannot commit an image into itself");
3290
        goto out;
3291 3292
    }

3293
    if (top_bs == bs) {
3294 3295 3296
        if (has_backing_file) {
            error_setg(errp, "'backing-file' specified,"
                             " but 'top' is the active layer");
3297
            goto out;
3298
        }
3299
        commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3300
                            job_flags, speed, on_error,
3301
                            filter_node_name, NULL, NULL, false, &local_err);
3302
    } else {
3303 3304 3305 3306
        BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
        if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
            goto out;
        }
3307 3308
        commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
                     speed, on_error, has_backing_file ? backing_file : NULL,
3309
                     filter_node_name, &local_err);
3310
    }
3311 3312
    if (local_err != NULL) {
        error_propagate(errp, local_err);
3313
        goto out;
3314
    }
3315 3316 3317

out:
    aio_context_release(aio_context);
3318 3319
}

3320
static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3321
                                 Error **errp)
3322 3323 3324
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
3325
    BlockDriverState *source = NULL;
3326
    BlockJob *job = NULL;
3327
    BdrvDirtyBitmap *bmap = NULL;
3328
    AioContext *aio_context;
3329
    QDict *options = NULL;
3330
    Error *local_err = NULL;
3331
    int flags, job_flags = JOB_DEFAULT;
3332
    int64_t size;
3333
    bool set_backing_hd = false;
3334

3335 3336
    if (!backup->has_speed) {
        backup->speed = 0;
3337
    }
3338 3339
    if (!backup->has_on_source_error) {
        backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3340
    }
3341 3342
    if (!backup->has_on_target_error) {
        backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3343
    }
3344 3345 3346 3347 3348
    if (!backup->has_mode) {
        backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
    if (!backup->has_job_id) {
        backup->job_id = NULL;
3349
    }
3350 3351 3352 3353 3354 3355
    if (!backup->has_auto_finalize) {
        backup->auto_finalize = true;
    }
    if (!backup->has_auto_dismiss) {
        backup->auto_dismiss = true;
    }
3356 3357 3358
    if (!backup->has_compress) {
        backup->compress = false;
    }
3359

3360
    bs = qmp_get_root_bs(backup->device, errp);
3361
    if (!bs) {
3362
        return NULL;
3363 3364
    }

3365
    aio_context = bdrv_get_aio_context(bs);
3366 3367
    aio_context_acquire(aio_context);

3368 3369 3370
    if (!backup->has_format) {
        backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
                         NULL : (char*) bs->drv->format_name;
3371 3372
    }

3373
    /* Early check to avoid creating target */
3374
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3375
        goto out;
3376 3377
    }

3378
    flags = bs->open_flags | BDRV_O_RDWR;
3379

3380 3381
    /* See if we have a backing HD we can use to create our new image
     * on top of. */
3382
    if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3383
        source = backing_bs(bs);
3384
        if (!source) {
3385
            backup->sync = MIRROR_SYNC_MODE_FULL;
3386 3387
        }
    }
3388
    if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3389
        source = bs;
3390 3391
        flags |= BDRV_O_NO_BACKING;
        set_backing_hd = true;
3392 3393
    }

3394 3395 3396
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
3397
        goto out;
3398 3399
    }

3400 3401
    if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
        assert(backup->format);
3402
        if (source) {
3403
            bdrv_img_create(backup->target, backup->format, source->filename,
3404
                            source->drv->format_name, NULL,
3405
                            size, flags, false, &local_err);
3406
        } else {
3407
            bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3408
                            size, flags, false, &local_err);
3409
        }
3410 3411
    }

3412
    if (local_err) {
3413
        error_propagate(errp, local_err);
3414
        goto out;
3415 3416
    }

3417
    if (backup->format) {
3418 3419 3420
        if (!options) {
            options = qdict_new();
        }
3421
        qdict_put_str(options, "driver", backup->format);
3422 3423
    }

3424
    target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3425
    if (!target_bs) {
3426
        goto out;
3427 3428
    }

3429 3430
    bdrv_set_aio_context(target_bs, aio_context);

3431 3432 3433 3434 3435 3436 3437 3438
    if (set_backing_hd) {
        bdrv_set_backing_hd(target_bs, source, &local_err);
        if (local_err) {
            bdrv_unref(target_bs);
            goto out;
        }
    }

3439 3440
    if (backup->has_bitmap) {
        bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3441
        if (!bmap) {
3442
            error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3443
            bdrv_unref(target_bs);
3444 3445
            goto out;
        }
3446 3447 3448 3449 3450 3451
        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;
        }
3452
    }
3453
    if (!backup->auto_finalize) {
3454
        job_flags |= JOB_MANUAL_FINALIZE;
3455 3456
    }
    if (!backup->auto_dismiss) {
3457
        job_flags |= JOB_MANUAL_DISMISS;
3458
    }
3459

3460 3461 3462
    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,
3463
                            job_flags, NULL, NULL, txn, &local_err);
3464
    bdrv_unref(target_bs);
3465 3466
    if (local_err != NULL) {
        error_propagate(errp, local_err);
3467
        goto out;
3468
    }
3469 3470 3471

out:
    aio_context_release(aio_context);
3472
    return job;
3473 3474
}

3475
void qmp_drive_backup(DriveBackup *arg, Error **errp)
3476
{
3477 3478 3479 3480

    BlockJob *job;
    job = do_drive_backup(arg, NULL, errp);
    if (job) {
3481
        job_start(&job->job);
3482
    }
3483 3484
}

3485 3486
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
3487
    return bdrv_named_nodes_list(errp);
3488 3489
}

3490
BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3491
                             Error **errp)
3492 3493 3494 3495 3496
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    Error *local_err = NULL;
    AioContext *aio_context;
3497
    BlockJob *job = NULL;
3498
    int job_flags = JOB_DEFAULT;
3499

3500 3501
    if (!backup->has_speed) {
        backup->speed = 0;
3502
    }
3503 3504 3505 3506 3507
    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;
3508
    }
3509 3510
    if (!backup->has_job_id) {
        backup->job_id = NULL;
3511
    }
3512 3513 3514 3515 3516 3517
    if (!backup->has_auto_finalize) {
        backup->auto_finalize = true;
    }
    if (!backup->has_auto_dismiss) {
        backup->auto_dismiss = true;
    }
3518 3519 3520
    if (!backup->has_compress) {
        backup->compress = false;
    }
3521

3522
    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
3523
    if (!bs) {
3524
        return NULL;
3525 3526
    }

3527
    aio_context = bdrv_get_aio_context(bs);
3528 3529
    aio_context_acquire(aio_context);

3530
    target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3531
    if (!target_bs) {
M
Max Reitz 已提交
3532 3533
        goto out;
    }
3534

3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545
    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;
        }
    }
3546
    if (!backup->auto_finalize) {
3547
        job_flags |= JOB_MANUAL_FINALIZE;
3548 3549
    }
    if (!backup->auto_dismiss) {
3550
        job_flags |= JOB_MANUAL_DISMISS;
3551
    }
3552 3553 3554
    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,
3555
                            job_flags, NULL, NULL, txn, &local_err);
3556 3557 3558 3559 3560
    if (local_err != NULL) {
        error_propagate(errp, local_err);
    }
out:
    aio_context_release(aio_context);
3561
    return job;
3562 3563
}

3564 3565
void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
{
3566 3567 3568
    BlockJob *job;
    job = do_blockdev_backup(arg, NULL, errp);
    if (job) {
3569
        job_start(&job->job);
3570
    }
3571 3572
}

3573 3574 3575
/* Parameter check and block job starting for drive mirroring.
 * Caller should hold @device and @target's aio context (must be the same).
 **/
3576
static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3577 3578 3579
                                   BlockDriverState *target,
                                   bool has_replaces, const char *replaces,
                                   enum MirrorSyncMode sync,
3580
                                   BlockMirrorBackingMode backing_mode,
3581 3582 3583 3584 3585 3586 3587 3588
                                   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,
3589 3590
                                   bool has_filter_node_name,
                                   const char *filter_node_name,
3591
                                   bool has_copy_mode, MirrorCopyMode copy_mode,
3592
                                   Error **errp)
3593
{
3594
    int job_flags = JOB_DEFAULT;
3595 3596 3597 3598

    if (!has_speed) {
        speed = 0;
    }
3599 3600 3601 3602 3603 3604
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
3605 3606 3607
    if (!has_granularity) {
        granularity = 0;
    }
3608
    if (!has_buf_size) {
W
Wen Congyang 已提交
3609
        buf_size = 0;
3610
    }
3611 3612 3613
    if (!has_unmap) {
        unmap = true;
    }
3614 3615 3616
    if (!has_filter_node_name) {
        filter_node_name = NULL;
    }
3617 3618 3619
    if (!has_copy_mode) {
        copy_mode = MIRROR_COPY_MODE_BACKGROUND;
    }
3620

3621
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3622 3623
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "a value in range [512B, 64MB]");
3624 3625 3626
        return;
    }
    if (granularity & (granularity - 1)) {
3627 3628
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "power of 2");
3629 3630
        return;
    }
3631

3632 3633 3634
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
        return;
    }
3635 3636 3637
    if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
        return;
    }
3638 3639 3640 3641 3642 3643 3644 3645

    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
     */
3646
    mirror_start(job_id, bs, target,
3647
                 has_replaces ? replaces : NULL, job_flags,
3648
                 speed, granularity, buf_size, sync, backing_mode,
3649
                 on_source_error, on_target_error, unmap, filter_node_name,
3650
                 copy_mode, errp);
3651 3652
}

3653
void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3654 3655 3656 3657
{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
    AioContext *aio_context;
3658
    BlockMirrorBackingMode backing_mode;
3659 3660 3661 3662
    Error *local_err = NULL;
    QDict *options = NULL;
    int flags;
    int64_t size;
3663
    const char *format = arg->format;
3664

3665 3666
    bs = qmp_get_root_bs(arg->device, errp);
    if (!bs) {
3667 3668 3669
        return;
    }

3670 3671 3672 3673 3674
    /* Early check to avoid creating target */
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
        return;
    }

3675
    aio_context = bdrv_get_aio_context(bs);
3676 3677
    aio_context_acquire(aio_context);

3678 3679
    if (!arg->has_mode) {
        arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3680
    }
3681

3682 3683 3684
    if (!arg->has_format) {
        format = (arg->mode == NEW_IMAGE_MODE_EXISTING
                  ? NULL : bs->drv->format_name);
3685 3686
    }

3687
    flags = bs->open_flags | BDRV_O_RDWR;
3688
    source = backing_bs(bs);
3689 3690
    if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
        arg->sync = MIRROR_SYNC_MODE_FULL;
3691
    }
3692
    if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3693 3694
        source = bs;
    }
3695

3696 3697 3698
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
3699
        goto out;
3700 3701
    }

3702
    if (arg->has_replaces) {
3703
        BlockDriverState *to_replace_bs;
3704 3705
        AioContext *replace_aio_context;
        int64_t replace_size;
3706

3707
        if (!arg->has_node_name) {
3708 3709
            error_setg(errp, "a node-name must be provided when replacing a"
                             " named node of the graph");
3710
            goto out;
3711 3712
        }

3713
        to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3714 3715 3716

        if (!to_replace_bs) {
            error_propagate(errp, local_err);
3717
            goto out;
3718 3719
        }

3720 3721 3722 3723 3724 3725
        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) {
3726 3727
            error_setg(errp, "cannot replace image with a mirror image of "
                             "different size");
3728
            goto out;
3729 3730 3731
        }
    }

3732
    if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3733 3734 3735 3736 3737
        backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
    } else {
        backing_mode = MIRROR_OPEN_BACKING_CHAIN;
    }

3738 3739 3740
    /* Don't open backing image in create() */
    flags |= BDRV_O_NO_BACKING;

3741 3742
    if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
        && arg->mode != NEW_IMAGE_MODE_EXISTING)
3743
    {
3744
        /* create new image w/o backing file */
3745
        assert(format);
3746
        bdrv_img_create(arg->target, format,
3747
                        NULL, NULL, NULL, size, flags, false, &local_err);
3748
    } else {
3749
        switch (arg->mode) {
3750 3751 3752 3753
        case NEW_IMAGE_MODE_EXISTING:
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
3754
            bdrv_img_create(arg->target, format,
3755 3756
                            source->filename,
                            source->drv->format_name,
3757
                            NULL, size, flags, false, &local_err);
3758 3759 3760 3761 3762 3763
            break;
        default:
            abort();
        }
    }

3764
    if (local_err) {
3765
        error_propagate(errp, local_err);
3766
        goto out;
3767 3768
    }

3769
    options = qdict_new();
3770
    if (arg->has_node_name) {
3771
        qdict_put_str(options, "node-name", arg->node_name);
3772
    }
3773
    if (format) {
3774
        qdict_put_str(options, "driver", format);
3775
    }
3776

3777 3778 3779
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
3780
    target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3781
    if (!target_bs) {
3782
        goto out;
3783 3784
    }

3785 3786
    bdrv_set_aio_context(target_bs, aio_context);

3787 3788 3789 3790 3791 3792 3793 3794
    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,
3795
                           false, NULL,
3796
                           arg->has_copy_mode, arg->copy_mode,
3797
                           &local_err);
3798
    bdrv_unref(target_bs);
3799
    error_propagate(errp, local_err);
3800 3801
out:
    aio_context_release(aio_context);
3802 3803
}

3804 3805
void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
                         const char *device, const char *target,
3806 3807 3808 3809 3810 3811 3812 3813 3814
                         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,
3815 3816
                         bool has_filter_node_name,
                         const char *filter_node_name,
3817
                         bool has_copy_mode, MirrorCopyMode copy_mode,
3818 3819 3820 3821 3822
                         Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    AioContext *aio_context;
3823
    BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3824 3825
    Error *local_err = NULL;

3826
    bs = qmp_get_root_bs(device, errp);
3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840
    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);

3841
    blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3842
                           has_replaces, replaces, sync, backing_mode,
3843 3844 3845 3846 3847 3848
                           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,
3849
                           has_filter_node_name, filter_node_name,
3850
                           has_copy_mode, copy_mode,
3851
                           &local_err);
3852
    error_propagate(errp, local_err);
3853 3854 3855 3856

    aio_context_release(aio_context);
}

3857 3858
/* Get a block job using its ID and acquire its AioContext */
static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3859
                                Error **errp)
3860
{
3861
    BlockJob *job;
3862

3863
    assert(id != NULL);
M
Max Reitz 已提交
3864

3865
    *aio_context = NULL;
3866

3867
    job = block_job_get(id);
M
Max Reitz 已提交
3868

3869 3870 3871 3872
    if (!job) {
        error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
                  "Block job '%s' not found", id);
        return NULL;
3873
    }
3874

3875 3876
    *aio_context = blk_get_aio_context(job->blk);
    aio_context_acquire(*aio_context);
3877

3878
    return job;
3879 3880
}

3881
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3882
{
3883
    AioContext *aio_context;
3884
    BlockJob *job = find_block_job(device, &aio_context, errp);
3885 3886 3887 3888 3889

    if (!job) {
        return;
    }

3890
    block_job_set_speed(job, speed, errp);
3891
    aio_context_release(aio_context);
3892
}
3893

3894 3895
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
3896
{
3897
    AioContext *aio_context;
3898
    BlockJob *job = find_block_job(device, &aio_context, errp);
3899

3900 3901 3902
    if (!job) {
        return;
    }
3903 3904 3905 3906 3907

    if (!has_force) {
        force = false;
    }

3908
    if (job_user_paused(&job->job) && !force) {
3909 3910
        error_setg(errp, "The block job for device '%s' is currently paused",
                   device);
3911
        goto out;
3912
    }
3913 3914

    trace_qmp_block_job_cancel(job);
3915
    job_user_cancel(&job->job, force, errp);
3916 3917
out:
    aio_context_release(aio_context);
3918
}
3919

3920 3921
void qmp_block_job_pause(const char *device, Error **errp)
{
3922
    AioContext *aio_context;
3923
    BlockJob *job = find_block_job(device, &aio_context, errp);
3924

3925
    if (!job) {
3926 3927 3928 3929
        return;
    }

    trace_qmp_block_job_pause(job);
3930
    job_user_pause(&job->job, errp);
3931
    aio_context_release(aio_context);
3932 3933 3934 3935
}

void qmp_block_job_resume(const char *device, Error **errp)
{
3936
    AioContext *aio_context;
3937
    BlockJob *job = find_block_job(device, &aio_context, errp);
3938

3939
    if (!job) {
3940 3941 3942 3943
        return;
    }

    trace_qmp_block_job_resume(job);
3944
    job_user_resume(&job->job, errp);
3945
    aio_context_release(aio_context);
3946 3947
}

3948 3949
void qmp_block_job_complete(const char *device, Error **errp)
{
3950
    AioContext *aio_context;
3951
    BlockJob *job = find_block_job(device, &aio_context, errp);
3952 3953 3954 3955 3956 3957

    if (!job) {
        return;
    }

    trace_qmp_block_job_complete(job);
3958
    job_complete(&job->job, errp);
3959
    aio_context_release(aio_context);
3960 3961
}

3962 3963 3964 3965 3966 3967 3968 3969 3970 3971
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);
3972
    job_finalize(&job->job, errp);
3973 3974 3975
    aio_context_release(aio_context);
}

3976 3977 3978
void qmp_block_job_dismiss(const char *id, Error **errp)
{
    AioContext *aio_context;
K
Kevin Wolf 已提交
3979 3980
    BlockJob *bjob = find_block_job(id, &aio_context, errp);
    Job *job;
3981

K
Kevin Wolf 已提交
3982
    if (!bjob) {
3983 3984 3985
        return;
    }

K
Kevin Wolf 已提交
3986 3987 3988
    trace_qmp_block_job_dismiss(bjob);
    job = &bjob->job;
    job_dismiss(&job, errp);
3989 3990 3991
    aio_context_release(aio_context);
}

3992 3993 3994 3995 3996 3997
void qmp_change_backing_file(const char *device,
                             const char *image_node_name,
                             const char *backing_file,
                             Error **errp)
{
    BlockDriverState *bs = NULL;
3998
    AioContext *aio_context;
3999 4000 4001 4002 4003 4004
    BlockDriverState *image_bs = NULL;
    Error *local_err = NULL;
    bool ro;
    int open_flags;
    int ret;

4005 4006
    bs = qmp_get_root_bs(device, errp);
    if (!bs) {
4007 4008 4009
        return;
    }

4010
    aio_context = bdrv_get_aio_context(bs);
4011 4012
    aio_context_acquire(aio_context);

4013 4014 4015
    image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
4016
        goto out;
4017 4018 4019 4020
    }

    if (!image_bs) {
        error_setg(errp, "image file not found");
4021
        goto out;
4022 4023 4024 4025 4026
    }

    if (bdrv_find_base(image_bs) == image_bs) {
        error_setg(errp, "not allowing backing file change on an image "
                         "without a backing file");
4027
        goto out;
4028 4029 4030 4031 4032
    }

    /* 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)) {
4033
        goto out;
4034 4035 4036 4037 4038 4039
    }

    /* final sanity check */
    if (!bdrv_chain_contains(bs, image_bs)) {
        error_setg(errp, "'%s' and image file are not in the same chain",
                   device);
4040
        goto out;
4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
    }

    /* 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);
4051
            goto out;
4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066
        }
    }

    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);
4067
        error_propagate(errp, local_err);
4068
    }
4069 4070 4071

out:
    aio_context_release(aio_context);
4072 4073
}

4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087
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")) {
4088
        qobject_unref(qdict);
4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104
        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);
}

4105 4106
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
4107
    BlockDriverState *bs;
4108
    QObject *obj;
4109
    Visitor *v = qobject_output_visitor_new(&obj);
4110 4111 4112
    QDict *qdict;
    Error *local_err = NULL;

4113
    visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4114
    if (local_err) {
4115 4116 4117 4118
        error_propagate(errp, local_err);
        goto fail;
    }

4119
    visit_complete(v, &obj);
4120
    qdict = qobject_to(QDict, obj);
4121 4122 4123

    qdict_flatten(qdict);

4124 4125 4126 4127
    if (!qdict_get_try_str(qdict, "node-name")) {
        error_setg(errp, "'node-name' must be specified for the root node");
        goto fail;
    }
4128

4129 4130 4131
    bs = bds_tree_init(qdict, errp);
    if (!bs) {
        goto fail;
4132 4133
    }

4134 4135
    QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);

4136
fail:
4137
    visit_free(v);
4138 4139
}

4140
void qmp_blockdev_del(const char *node_name, Error **errp)
4141 4142 4143 4144
{
    AioContext *aio_context;
    BlockDriverState *bs;

4145 4146 4147
    bs = bdrv_find_node(node_name);
    if (!bs) {
        error_setg(errp, "Cannot find node %s", node_name);
4148 4149
        return;
    }
4150 4151 4152
    if (bdrv_has_blk(bs)) {
        error_setg(errp, "Node %s is in use", node_name);
        return;
4153
    }
4154
    aio_context = bdrv_get_aio_context(bs);
4155 4156
    aio_context_acquire(aio_context);

4157 4158 4159
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
        goto out;
    }
4160

4161 4162 4163 4164
    if (!bs->monitor_list.tqe_prev) {
        error_setg(errp, "Node %s is not owned by the monitor",
                   bs->node_name);
        goto out;
4165 4166
    }

4167 4168 4169 4170
    if (bs->refcnt > 1) {
        error_setg(errp, "Block device %s is in use",
                   bdrv_get_device_or_node_name(bs));
        goto out;
4171 4172
    }

4173 4174 4175
    QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
    bdrv_unref(bs);

4176 4177 4178 4179
out:
    aio_context_release(aio_context);
}

4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 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
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);
    }
}

4235
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4236
{
4237
    BlockJobInfoList *head = NULL, **p_next = &head;
4238
    BlockJob *job;
4239

4240
    for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4241 4242
        BlockJobInfoList *elem;
        AioContext *aio_context;
4243

4244 4245 4246 4247 4248
        if (block_job_is_internal(job)) {
            continue;
        }
        elem = g_new0(BlockJobInfoList, 1);
        aio_context = blk_get_aio_context(job->blk);
4249
        aio_context_acquire(aio_context);
4250
        elem->value = block_job_query(job, errp);
4251
        aio_context_release(aio_context);
4252 4253 4254 4255 4256
        if (!elem->value) {
            g_free(elem);
            qapi_free_BlockJobInfoList(head);
            return NULL;
        }
4257 4258
        *p_next = elem;
        p_next = &elem->next;
4259 4260
    }

4261
    return head;
4262
}
4263

4264
void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4265
                                 bool has_force, bool force, Error **errp)
4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276
{
    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;
    }

4277 4278 4279 4280 4281
    /* 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);
4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304
        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);
}

4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347
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);
    }
}

4348
QemuOptsList qemu_common_drive_opts = {
4349
    .name = "drive",
4350
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4351 4352 4353 4354 4355 4356 4357 4358 4359
    .desc = {
        {
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
        },{
            .name = "aio",
            .type = QEMU_OPT_STRING,
            .help = "host AIO implementation (threads, native)",
4360 4361 4362 4363
        },{
            .name = BDRV_OPT_CACHE_WB,
            .type = QEMU_OPT_BOOL,
            .help = "Enable writeback mode",
4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376
        },{
            .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",
        },{
4377
            .name = BDRV_OPT_READ_ONLY,
4378 4379
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
4380 4381 4382 4383 4384
        },

        THROTTLE_OPTS,

        {
4385 4386 4387
            .name = "throttling.group",
            .type = QEMU_OPT_STRING,
            .help = "name of the block throttling group",
4388 4389 4390 4391
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
4392 4393 4394 4395
        },{
            .name = "detect-zeroes",
            .type = QEMU_OPT_STRING,
            .help = "try to optimize zero writes (off, on, unmap)",
4396 4397 4398 4399 4400 4401 4402 4403 4404 4405
        },{
            .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",
4406 4407 4408 4409
        },
        { /* end of list */ }
    },
};
4410 4411 4412 4413 4414

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
4415 4416 4417 4418
        /*
         * no elements => accept any params
         * validation will happen later
         */
4419 4420 4421
        { /* end of list */ }
    },
};
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