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qemu/blockdev.c
Stefan Weil 3a6f270326 block: Remove unused assignment (fixes warning from clang) 
blockdev.c:1929:13: warning: Value stored to 'ret' is never read
            ret = 0;
            ^     ~

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2013-10-02 22:55:28 +04:00

2243 lines
64 KiB
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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.
*
* 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.
*/
#include "sysemu/blockdev.h"
#include "hw/block/block.h"
#include "block/blockjob.h"
#include "monitor/monitor.h"
#include "qapi/qmp/qerror.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qapi/qmp/types.h"
#include "sysemu/sysemu.h"
#include "block/block_int.h"
#include "qmp-commands.h"
#include "trace.h"
#include "sysemu/arch_init.h"
static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
extern QemuOptsList qemu_common_drive_opts;
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",
};
static const int if_max_devs[IF_COUNT] = {
/*
* Do not change these numbers! They govern how drive option
* index maps to unit and bus. That mapping is ABI.
*
* All controllers used to imlement if=T drives need to support
* if_max_devs[T] units, for any T with if_max_devs[T] != 0.
* Otherwise, some index values map to "impossible" bus, unit
* values.
*
* For instance, if you change [IF_SCSI] to 255, -drive
* if=scsi,index=12 no longer means bus=1,unit=5, but
* bus=0,unit=12. With an lsi53c895a controller (7 units max),
* the drive can't be set up. Regression.
*/
[IF_IDE] = 2,
[IF_SCSI] = 7,
};
/*
* 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.
*/
void blockdev_mark_auto_del(BlockDriverState *bs)
{
DriveInfo *dinfo = drive_get_by_blockdev(bs);
if (bs->job) {
block_job_cancel(bs->job);
}
if (dinfo) {
dinfo->auto_del = 1;
}
}
void blockdev_auto_del(BlockDriverState *bs)
{
DriveInfo *dinfo = drive_get_by_blockdev(bs);
if (dinfo && dinfo->auto_del) {
drive_put_ref(dinfo);
}
}
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;
}
QemuOpts *drive_def(const char *optstr)
{
return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
}
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
QemuOpts *opts;
char buf[32];
opts = drive_def(optstr);
if (!opts) {
return NULL;
}
if (type != IF_DEFAULT) {
qemu_opt_set(opts, "if", if_name[type]);
}
if (index >= 0) {
snprintf(buf, sizeof(buf), "%d", index);
qemu_opt_set(opts, "index", buf);
}
if (file)
qemu_opt_set(opts, "file", file);
return opts;
}
DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
DriveInfo *dinfo;
/* seek interface, bus and unit */
QTAILQ_FOREACH(dinfo, &drives, next) {
if (dinfo->type == type &&
dinfo->bus == bus &&
dinfo->unit == unit)
return dinfo;
}
return NULL;
}
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));
}
int drive_get_max_bus(BlockInterfaceType type)
{
int max_bus;
DriveInfo *dinfo;
max_bus = -1;
QTAILQ_FOREACH(dinfo, &drives, next) {
if(dinfo->type == type &&
dinfo->bus > max_bus)
max_bus = dinfo->bus;
}
return max_bus;
}
/* 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]++);
}
DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
{
DriveInfo *dinfo;
QTAILQ_FOREACH(dinfo, &drives, next) {
if (dinfo->bdrv == bs) {
return dinfo;
}
}
return NULL;
}
static void bdrv_format_print(void *opaque, const char *name)
{
error_printf(" %s", name);
}
static void drive_uninit(DriveInfo *dinfo)
{
qemu_opts_del(dinfo->opts);
bdrv_unref(dinfo->bdrv);
g_free(dinfo->id);
QTAILQ_REMOVE(&drives, dinfo, next);
g_free(dinfo->serial);
g_free(dinfo);
}
void drive_put_ref(DriveInfo *dinfo)
{
assert(dinfo->refcount);
if (--dinfo->refcount == 0) {
drive_uninit(dinfo);
}
}
void drive_get_ref(DriveInfo *dinfo)
{
dinfo->refcount++;
}
typedef struct {
QEMUBH *bh;
BlockDriverState *bs;
} BDRVPutRefBH;
static void bdrv_put_ref_bh(void *opaque)
{
BDRVPutRefBH *s = opaque;
bdrv_unref(s->bs);
qemu_bh_delete(s->bh);
g_free(s);
}
/*
* Release a BDS reference in a BH
*
* It is not safe to use bdrv_unref() from a callback function when the callers
* still need the BlockDriverState. In such cases we schedule a BH to release
* the reference.
*/
static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
{
BDRVPutRefBH *s;
s = g_new(BDRVPutRefBH, 1);
s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
s->bs = bs;
qemu_bh_schedule(s->bh);
}
static int parse_block_error_action(const char *buf, bool is_read)
{
if (!strcmp(buf, "ignore")) {
return BLOCKDEV_ON_ERROR_IGNORE;
} else if (!is_read && !strcmp(buf, "enospc")) {
return BLOCKDEV_ON_ERROR_ENOSPC;
} else if (!strcmp(buf, "stop")) {
return BLOCKDEV_ON_ERROR_STOP;
} else if (!strcmp(buf, "report")) {
return BLOCKDEV_ON_ERROR_REPORT;
} else {
error_report("'%s' invalid %s error action",
buf, is_read ? "read" : "write");
return -1;
}
}
static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
{
if (throttle_conflicting(cfg)) {
error_setg(errp, "bps/iops/max total values and read/write values"
" cannot be used at the same time");
return false;
}
if (!throttle_is_valid(cfg)) {
error_setg(errp, "bps/iops/maxs values must be 0 or greater");
return false;
}
return true;
}
static DriveInfo *blockdev_init(QemuOpts *all_opts,
BlockInterfaceType block_default_type)
{
const char *buf;
const char *file = NULL;
const char *serial;
const char *mediastr = "";
BlockInterfaceType type;
enum { MEDIA_DISK, MEDIA_CDROM } media;
int bus_id, unit_id;
int cyls, heads, secs, translation;
int max_devs;
int index;
int ro = 0;
int bdrv_flags = 0;
int on_read_error, on_write_error;
const char *devaddr;
DriveInfo *dinfo;
ThrottleConfig cfg;
int snapshot = 0;
bool copy_on_read;
int ret;
Error *error = NULL;
QemuOpts *opts;
QDict *bs_opts;
const char *id;
bool has_driver_specific_opts;
BlockDriver *drv = NULL;
translation = BIOS_ATA_TRANSLATION_AUTO;
media = MEDIA_DISK;
/* Check common options by copying from all_opts to opts, all other options
* are stored in bs_opts. */
id = qemu_opts_id(all_opts);
opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
if (error_is_set(&error)) {
qerror_report_err(error);
error_free(error);
return NULL;
}
bs_opts = qdict_new();
qemu_opts_to_qdict(all_opts, bs_opts);
qemu_opts_absorb_qdict(opts, bs_opts, &error);
if (error_is_set(&error)) {
qerror_report_err(error);
error_free(error);
return NULL;
}
if (id) {
qdict_del(bs_opts, "id");
}
has_driver_specific_opts = !!qdict_size(bs_opts);
/* extract parameters */
bus_id = qemu_opt_get_number(opts, "bus", 0);
unit_id = qemu_opt_get_number(opts, "unit", -1);
index = qemu_opt_get_number(opts, "index", -1);
cyls = qemu_opt_get_number(opts, "cyls", 0);
heads = qemu_opt_get_number(opts, "heads", 0);
secs = qemu_opt_get_number(opts, "secs", 0);
snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
ro = qemu_opt_get_bool(opts, "read-only", 0);
copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
file = qemu_opt_get(opts, "file");
serial = qemu_opt_get(opts, "serial");
if ((buf = qemu_opt_get(opts, "if")) != NULL) {
for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
;
if (type == IF_COUNT) {
error_report("unsupported bus type '%s'", buf);
return NULL;
}
} else {
type = block_default_type;
}
max_devs = if_max_devs[type];
if (cyls || heads || secs) {
if (cyls < 1) {
error_report("invalid physical cyls number");
return NULL;
}
if (heads < 1) {
error_report("invalid physical heads number");
return NULL;
}
if (secs < 1) {
error_report("invalid physical secs number");
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
if (!cyls) {
error_report("'%s' trans must be used with cyls, heads and secs",
buf);
return NULL;
}
if (!strcmp(buf, "none"))
translation = BIOS_ATA_TRANSLATION_NONE;
else if (!strcmp(buf, "lba"))
translation = BIOS_ATA_TRANSLATION_LBA;
else if (!strcmp(buf, "auto"))
translation = BIOS_ATA_TRANSLATION_AUTO;
else {
error_report("'%s' invalid translation type", buf);
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "media")) != NULL) {
if (!strcmp(buf, "disk")) {
media = MEDIA_DISK;
} else if (!strcmp(buf, "cdrom")) {
if (cyls || secs || heads) {
error_report("CHS can't be set with media=%s", buf);
return NULL;
}
media = MEDIA_CDROM;
} else {
error_report("'%s' invalid media", buf);
return NULL;
}
}
if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
error_report("invalid discard option");
return NULL;
}
}
if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
bdrv_flags |= BDRV_O_CACHE_WB;
}
if (qemu_opt_get_bool(opts, "cache.direct", false)) {
bdrv_flags |= BDRV_O_NOCACHE;
}
if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
bdrv_flags |= BDRV_O_NO_FLUSH;
}
#ifdef CONFIG_LINUX_AIO
if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
if (!strcmp(buf, "native")) {
bdrv_flags |= BDRV_O_NATIVE_AIO;
} else if (!strcmp(buf, "threads")) {
/* this is the default */
} else {
error_report("invalid aio option");
return NULL;
}
}
#endif
if ((buf = qemu_opt_get(opts, "format")) != NULL) {
if (is_help_option(buf)) {
error_printf("Supported formats:");
bdrv_iterate_format(bdrv_format_print, NULL);
error_printf("\n");
return NULL;
}
drv = bdrv_find_whitelisted_format(buf, ro);
if (!drv) {
if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
error_report("'%s' can be only used as read-only device.", buf);
} else {
error_report("'%s' invalid format", buf);
}
return NULL;
}
}
/* disk I/O throttling */
memset(&cfg, 0, sizeof(cfg));
cfg.buckets[THROTTLE_BPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.bps-total", 0);
cfg.buckets[THROTTLE_BPS_READ].avg =
qemu_opt_get_number(opts, "throttling.bps-read", 0);
cfg.buckets[THROTTLE_BPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.bps-write", 0);
cfg.buckets[THROTTLE_OPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.iops-total", 0);
cfg.buckets[THROTTLE_OPS_READ].avg =
qemu_opt_get_number(opts, "throttling.iops-read", 0);
cfg.buckets[THROTTLE_OPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.iops-write", 0);
cfg.buckets[THROTTLE_BPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
cfg.buckets[THROTTLE_BPS_READ].max =
qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
cfg.buckets[THROTTLE_BPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
cfg.buckets[THROTTLE_OPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
cfg.buckets[THROTTLE_OPS_READ].max =
qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
cfg.buckets[THROTTLE_OPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
if (!check_throttle_config(&cfg, &error)) {
error_report("%s", error_get_pretty(error));
error_free(error);
return NULL;
}
if (qemu_opt_get(opts, "boot") != NULL) {
fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
"ignored. Future versions will reject this parameter. Please "
"update your scripts.\n");
}
on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
if ((buf = qemu_opt_get(opts, "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");
return NULL;
}
on_write_error = parse_block_error_action(buf, 0);
if (on_write_error < 0) {
return NULL;
}
}
on_read_error = BLOCKDEV_ON_ERROR_REPORT;
if ((buf = qemu_opt_get(opts, "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");
return NULL;
}
on_read_error = parse_block_error_action(buf, 1);
if (on_read_error < 0) {
return NULL;
}
}
if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
if (type != IF_VIRTIO) {
error_report("addr is not supported by this bus type");
return NULL;
}
}
/* compute bus and unit according index */
if (index != -1) {
if (bus_id != 0 || unit_id != -1) {
error_report("index cannot be used with bus and unit");
return NULL;
}
bus_id = drive_index_to_bus_id(type, index);
unit_id = drive_index_to_unit_id(type, index);
}
/* if user doesn't specify a unit_id,
* try to find the first free
*/
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++;
}
}
}
/* check unit id */
if (max_devs && unit_id >= max_devs) {
error_report("unit %d too big (max is %d)",
unit_id, max_devs - 1);
return NULL;
}
/*
* catch multiple definitions
*/
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);
return NULL;
}
/* init */
dinfo = g_malloc0(sizeof(*dinfo));
if ((buf = qemu_opts_id(opts)) != NULL) {
dinfo->id = g_strdup(buf);
} else {
/* no id supplied -> create one */
dinfo->id = g_malloc0(32);
if (type == IF_IDE || type == IF_SCSI)
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
if (max_devs)
snprintf(dinfo->id, 32, "%s%i%s%i",
if_name[type], bus_id, mediastr, unit_id);
else
snprintf(dinfo->id, 32, "%s%s%i",
if_name[type], mediastr, unit_id);
}
dinfo->bdrv = bdrv_new(dinfo->id);
dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
dinfo->bdrv->read_only = ro;
dinfo->devaddr = devaddr;
dinfo->type = type;
dinfo->bus = bus_id;
dinfo->unit = unit_id;
dinfo->cyls = cyls;
dinfo->heads = heads;
dinfo->secs = secs;
dinfo->trans = translation;
dinfo->opts = all_opts;
dinfo->refcount = 1;
if (serial != NULL) {
dinfo->serial = g_strdup(serial);
}
QTAILQ_INSERT_TAIL(&drives, dinfo, next);
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
/* disk I/O throttling */
if (throttle_enabled(&cfg)) {
bdrv_io_limits_enable(dinfo->bdrv);
bdrv_set_io_limits(dinfo->bdrv, &cfg);
}
switch(type) {
case IF_IDE:
case IF_SCSI:
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
break;
case IF_SD:
case IF_FLOPPY:
case IF_PFLASH:
case IF_MTD:
break;
case IF_VIRTIO:
{
/* add virtio block device */
QemuOpts *devopts;
devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
if (arch_type == QEMU_ARCH_S390X) {
qemu_opt_set(devopts, "driver", "virtio-blk-s390");
} else {
qemu_opt_set(devopts, "driver", "virtio-blk-pci");
}
qemu_opt_set(devopts, "drive", dinfo->id);
if (devaddr)
qemu_opt_set(devopts, "addr", devaddr);
break;
}
default:
abort();
}
if (!file || !*file) {
if (has_driver_specific_opts) {
file = NULL;
} else {
return dinfo;
}
}
if (snapshot) {
/* always use cache=unsafe with snapshot */
bdrv_flags &= ~BDRV_O_CACHE_MASK;
bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
}
if (copy_on_read) {
bdrv_flags |= BDRV_O_COPY_ON_READ;
}
if (runstate_check(RUN_STATE_INMIGRATE)) {
bdrv_flags |= BDRV_O_INCOMING;
}
if (media == MEDIA_CDROM) {
/* CDROM is fine for any interface, don't check. */
ro = 1;
} else if (ro == 1) {
if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
type != IF_NONE && type != IF_PFLASH) {
error_report("read-only not supported by this bus type");
goto err;
}
}
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
if (ro && copy_on_read) {
error_report("warning: disabling copy_on_read on read-only drive");
}
QINCREF(bs_opts);
ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
if (ret < 0) {
error_report("could not open disk image %s: %s",
file ?: dinfo->id, error_get_pretty(error));
goto err;
}
if (bdrv_key_required(dinfo->bdrv))
autostart = 0;
QDECREF(bs_opts);
qemu_opts_del(opts);
return dinfo;
err:
qemu_opts_del(opts);
QDECREF(bs_opts);
bdrv_unref(dinfo->bdrv);
g_free(dinfo->id);
QTAILQ_REMOVE(&drives, dinfo, next);
g_free(dinfo);
return NULL;
}
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
{
const char *value;
value = qemu_opt_get(opts, from);
if (value) {
qemu_opt_set(opts, to, value);
qemu_opt_unset(opts, from);
}
}
DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
{
const char *value;
/* Change legacy command line options into QMP ones */
qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
qemu_opt_rename(all_opts,
"iops_size", "throttling.iops-size");
qemu_opt_rename(all_opts, "readonly", "read-only");
value = qemu_opt_get(all_opts, "cache");
if (value) {
int flags = 0;
if (bdrv_parse_cache_flags(value, &flags) != 0) {
error_report("invalid cache option");
return NULL;
}
/* Specific options take precedence */
if (!qemu_opt_get(all_opts, "cache.writeback")) {
qemu_opt_set_bool(all_opts, "cache.writeback",
!!(flags & BDRV_O_CACHE_WB));
}
if (!qemu_opt_get(all_opts, "cache.direct")) {
qemu_opt_set_bool(all_opts, "cache.direct",
!!(flags & BDRV_O_NOCACHE));
}
if (!qemu_opt_get(all_opts, "cache.no-flush")) {
qemu_opt_set_bool(all_opts, "cache.no-flush",
!!(flags & BDRV_O_NO_FLUSH));
}
qemu_opt_unset(all_opts, "cache");
}
return blockdev_init(all_opts, block_default_type);
}
void do_commit(Monitor *mon, const QDict *qdict)
{
const char *device = qdict_get_str(qdict, "device");
BlockDriverState *bs;
int ret;
if (!strcmp(device, "all")) {
ret = bdrv_commit_all();
} else {
bs = bdrv_find(device);
if (!bs) {
monitor_printf(mon, "Device '%s' not found\n", device);
return;
}
ret = bdrv_commit(bs);
}
if (ret < 0) {
monitor_printf(mon, "'commit' error for '%s': %s\n", device,
strerror(-ret));
}
}
static void blockdev_do_action(int kind, void *data, Error **errp)
{
TransactionAction action;
TransactionActionList list;
action.kind = kind;
action.data = data;
list.value = &action;
list.next = NULL;
qmp_transaction(&list, errp);
}
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
bool has_format, const char *format,
bool has_mode, enum NewImageMode mode,
Error **errp)
{
BlockdevSnapshot snapshot = {
.device = (char *) device,
.snapshot_file = (char *) snapshot_file,
.has_format = has_format,
.format = (char *) format,
.has_mode = has_mode,
.mode = mode,
};
blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
&snapshot, errp);
}
void qmp_blockdev_snapshot_internal_sync(const char *device,
const char *name,
Error **errp)
{
BlockdevSnapshotInternal snapshot = {
.device = (char *) device,
.name = (char *) name
};
blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
&snapshot, errp);
}
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
bool has_id,
const char *id,
bool has_name,
const char *name,
Error **errp)
{
BlockDriverState *bs = bdrv_find(device);
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
int ret;
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return NULL;
}
if (!has_id) {
id = NULL;
}
if (!has_name) {
name = NULL;
}
if (!id && !name) {
error_setg(errp, "Name or id must be provided");
return NULL;
}
ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return NULL;
}
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);
return NULL;
}
bdrv_snapshot_delete(bs, id, name, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return NULL;
}
info = g_malloc0(sizeof(SnapshotInfo));
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;
}
/* New and old BlockDriverState structs for group snapshots */
typedef struct BlkTransactionState BlkTransactionState;
/* Only prepare() may fail. In a single transaction, only one of commit() or
abort() will be called, clean() will always be called if it present. */
typedef struct BdrvActionOps {
/* Size of state struct, in bytes. */
size_t instance_size;
/* Prepare the work, must NOT be NULL. */
void (*prepare)(BlkTransactionState *common, Error **errp);
/* Commit the changes, can be NULL. */
void (*commit)(BlkTransactionState *common);
/* Abort the changes on fail, can be NULL. */
void (*abort)(BlkTransactionState *common);
/* Clean up resource in the end, can be NULL. */
void (*clean)(BlkTransactionState *common);
} BdrvActionOps;
/*
* This structure must be arranged as first member in child type, assuming
* that compiler will also arrange it to the same address with parent instance.
* Later it will be used in free().
*/
struct BlkTransactionState {
TransactionAction *action;
const BdrvActionOps *ops;
QSIMPLEQ_ENTRY(BlkTransactionState) entry;
};
/* internal snapshot private data */
typedef struct InternalSnapshotState {
BlkTransactionState common;
BlockDriverState *bs;
QEMUSnapshotInfo sn;
} InternalSnapshotState;
static void internal_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
const char *device;
const char *name;
BlockDriverState *bs;
QEMUSnapshotInfo old_sn, *sn;
bool ret;
qemu_timeval tv;
BlockdevSnapshotInternal *internal;
InternalSnapshotState *state;
int ret1;
g_assert(common->action->kind ==
TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
internal = common->action->blockdev_snapshot_internal_sync;
state = DO_UPCAST(InternalSnapshotState, common, common);
/* 1. parse input */
device = internal->device;
name = internal->name;
/* 2. check for validation */
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_is_read_only(bs)) {
error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
return;
}
if (!bdrv_can_snapshot(bs)) {
error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
bs->drv->format_name, device, "internal snapshot");
return;
}
if (!strlen(name)) {
error_setg(errp, "Name is empty");
return;
}
/* check whether a snapshot with name exist */
ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
if (error_is_set(errp)) {
return;
} else if (ret) {
error_setg(errp,
"Snapshot with name '%s' already exists on device '%s'",
name, device);
return;
}
/* 3. take the snapshot */
sn = &state->sn;
pstrcpy(sn->name, sizeof(sn->name), name);
qemu_gettimeofday(&tv);
sn->date_sec = tv.tv_sec;
sn->date_nsec = tv.tv_usec * 1000;
sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
ret1 = bdrv_snapshot_create(bs, sn);
if (ret1 < 0) {
error_setg_errno(errp, -ret1,
"Failed to create snapshot '%s' on device '%s'",
name, device);
return;
}
/* 4. succeed, mark a snapshot is created */
state->bs = bs;
}
static void internal_snapshot_abort(BlkTransactionState *common)
{
InternalSnapshotState *state =
DO_UPCAST(InternalSnapshotState, common, common);
BlockDriverState *bs = state->bs;
QEMUSnapshotInfo *sn = &state->sn;
Error *local_error = NULL;
if (!bs) {
return;
}
if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
error_report("Failed to delete snapshot with id '%s' and name '%s' on "
"device '%s' in abort: %s",
sn->id_str,
sn->name,
bdrv_get_device_name(bs),
error_get_pretty(local_error));
error_free(local_error);
}
}
/* external snapshot private data */
typedef struct ExternalSnapshotState {
BlkTransactionState common;
BlockDriverState *old_bs;
BlockDriverState *new_bs;
} ExternalSnapshotState;
static void external_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
BlockDriver *drv;
int flags, ret;
Error *local_err = NULL;
const char *device;
const char *new_image_file;
const char *format = "qcow2";
enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
TransactionAction *action = common->action;
/* get parameters */
g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
device = action->blockdev_snapshot_sync->device;
new_image_file = action->blockdev_snapshot_sync->snapshot_file;
if (action->blockdev_snapshot_sync->has_format) {
format = action->blockdev_snapshot_sync->format;
}
if (action->blockdev_snapshot_sync->has_mode) {
mode = action->blockdev_snapshot_sync->mode;
}
/* start processing */
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
state->old_bs = bdrv_find(device);
if (!state->old_bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(state->old_bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_in_use(state->old_bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
if (!bdrv_is_read_only(state->old_bs)) {
if (bdrv_flush(state->old_bs)) {
error_set(errp, QERR_IO_ERROR);
return;
}
}
flags = state->old_bs->open_flags;
/* create new image w/backing file */
if (mode != NEW_IMAGE_MODE_EXISTING) {
bdrv_img_create(new_image_file, format,
state->old_bs->filename,
state->old_bs->drv->format_name,
NULL, -1, flags, &local_err, false);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
}
/* We will manually add the backing_hd field to the bs later */
state->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
ret = bdrv_open(state->new_bs, new_image_file, NULL,
flags | BDRV_O_NO_BACKING, drv, &local_err);
if (ret != 0) {
error_propagate(errp, local_err);
}
}
static void external_snapshot_commit(BlkTransactionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
/* This removes our old bs and adds the new bs */
bdrv_append(state->new_bs, state->old_bs);
/* 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 */
bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}
static void external_snapshot_abort(BlkTransactionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
if (state->new_bs) {
bdrv_unref(state->new_bs);
}
}
typedef struct DriveBackupState {
BlkTransactionState common;
BlockDriverState *bs;
BlockJob *job;
} DriveBackupState;
static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
DriveBackup *backup;
Error *local_err = NULL;
assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
backup = common->action->drive_backup;
qmp_drive_backup(backup->device, backup->target,
backup->has_format, backup->format,
backup->sync,
backup->has_mode, backup->mode,
backup->has_speed, backup->speed,
backup->has_on_source_error, backup->on_source_error,
backup->has_on_target_error, backup->on_target_error,
&local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
state->bs = NULL;
state->job = NULL;
return;
}
state->bs = bdrv_find(backup->device);
state->job = state->bs->job;
}
static void drive_backup_abort(BlkTransactionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
BlockDriverState *bs = state->bs;
/* Only cancel if it's the job we started */
if (bs && bs->job && bs->job == state->job) {
block_job_cancel_sync(bs->job);
}
}
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
error_setg(errp, "Transaction aborted using Abort action");
}
static void abort_commit(BlkTransactionState *common)
{
g_assert_not_reached(); /* this action never succeeds */
}
static const BdrvActionOps actions[] = {
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
.instance_size = sizeof(ExternalSnapshotState),
.prepare = external_snapshot_prepare,
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
},
[TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
.instance_size = sizeof(DriveBackupState),
.prepare = drive_backup_prepare,
.abort = drive_backup_abort,
},
[TRANSACTION_ACTION_KIND_ABORT] = {
.instance_size = sizeof(BlkTransactionState),
.prepare = abort_prepare,
.commit = abort_commit,
},
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
.instance_size = sizeof(InternalSnapshotState),
.prepare = internal_snapshot_prepare,
.abort = internal_snapshot_abort,
},
};
/*
* 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
* then we do not pivot any of the devices in the group, and abandon the
* snapshots
*/
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
{
TransactionActionList *dev_entry = dev_list;
BlkTransactionState *state, *next;
Error *local_err = NULL;
QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
QSIMPLEQ_INIT(&snap_bdrv_states);
/* drain all i/o before any snapshots */
bdrv_drain_all();
/* We don't do anything in this loop that commits us to the snapshot */
while (NULL != dev_entry) {
TransactionAction *dev_info = NULL;
const BdrvActionOps *ops;
dev_info = dev_entry->value;
dev_entry = dev_entry->next;
assert(dev_info->kind < ARRAY_SIZE(actions));
ops = &actions[dev_info->kind];
assert(ops->instance_size > 0);
state = g_malloc0(ops->instance_size);
state->ops = ops;
state->action = dev_info;
QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
state->ops->prepare(state, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
}
QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
if (state->ops->commit) {
state->ops->commit(state);
}
}
/* success */
goto exit;
delete_and_fail:
/*
* failure, and it is all-or-none; abandon each new bs, and keep using
* the original bs for all images
*/
QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
if (state->ops->abort) {
state->ops->abort(state);
}
}
exit:
QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
if (state->ops->clean) {
state->ops->clean(state);
}
g_free(state);
}
}
static void eject_device(BlockDriverState *bs, int force, Error **errp)
{
if (bdrv_in_use(bs)) {
error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return;
}
if (!bdrv_dev_has_removable_media(bs)) {
error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
return;
}
if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
bdrv_dev_eject_request(bs, force);
if (!force) {
error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
return;
}
}
bdrv_close(bs);
}
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
{
BlockDriverState *bs;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
eject_device(bs, force, errp);
}
void qmp_block_passwd(const char *device, const char *password, Error **errp)
{
BlockDriverState *bs;
int err;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
err = bdrv_set_key(bs, password);
if (err == -EINVAL) {
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
return;
} else if (err < 0) {
error_set(errp, QERR_INVALID_PASSWORD);
return;
}
}
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
int bdrv_flags, BlockDriver *drv,
const char *password, Error **errp)
{
Error *local_err = NULL;
int ret;
ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return;
}
if (bdrv_key_required(bs)) {
if (password) {
if (bdrv_set_key(bs, password) < 0) {
error_set(errp, QERR_INVALID_PASSWORD);
}
} else {
error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
bdrv_get_encrypted_filename(bs));
}
} else if (password) {
error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
}
}
void qmp_change_blockdev(const char *device, const char *filename,
bool has_format, const char *format, Error **errp)
{
BlockDriverState *bs;
BlockDriver *drv = NULL;
int bdrv_flags;
Error *err = NULL;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (format) {
drv = bdrv_find_whitelisted_format(format, bs->read_only);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
}
eject_device(bs, 0, &err);
if (error_is_set(&err)) {
error_propagate(errp, err);
return;
}
bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
}
/* throttling disk I/O limits */
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
int64_t bps_wr,
int64_t iops,
int64_t iops_rd,
int64_t iops_wr,
bool has_bps_max,
int64_t bps_max,
bool has_bps_rd_max,
int64_t bps_rd_max,
bool has_bps_wr_max,
int64_t bps_wr_max,
bool has_iops_max,
int64_t iops_max,
bool has_iops_rd_max,
int64_t iops_rd_max,
bool has_iops_wr_max,
int64_t iops_wr_max,
bool has_iops_size,
int64_t iops_size, Error **errp)
{
ThrottleConfig cfg;
BlockDriverState *bs;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
memset(&cfg, 0, sizeof(cfg));
cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
if (has_bps_max) {
cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
}
if (has_bps_rd_max) {
cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
}
if (has_bps_wr_max) {
cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
}
if (has_iops_max) {
cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
}
if (has_iops_rd_max) {
cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
}
if (has_iops_wr_max) {
cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
}
if (has_iops_size) {
cfg.op_size = iops_size;
}
if (!check_throttle_config(&cfg, errp)) {
return;
}
if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
bdrv_io_limits_enable(bs);
} else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
bdrv_io_limits_disable(bs);
}
if (bs->io_limits_enabled) {
bdrv_set_io_limits(bs, &cfg);
}
}
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
const char *id = qdict_get_str(qdict, "id");
BlockDriverState *bs;
bs = bdrv_find(id);
if (!bs) {
qerror_report(QERR_DEVICE_NOT_FOUND, id);
return -1;
}
if (bdrv_in_use(bs)) {
qerror_report(QERR_DEVICE_IN_USE, id);
return -1;
}
/* quiesce block driver; prevent further io */
bdrv_drain_all();
bdrv_flush(bs);
bdrv_close(bs);
/* if we have a device attached to this BlockDriverState
* then we need to make the drive anonymous until the device
* can be removed. If this is a drive with no device backing
* then we can just get rid of the block driver state right here.
*/
if (bdrv_get_attached_dev(bs)) {
bdrv_make_anon(bs);
/* Further I/O must not pause the guest */
bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
BLOCKDEV_ON_ERROR_REPORT);
} else {
drive_uninit(drive_get_by_blockdev(bs));
}
return 0;
}
void qmp_block_resize(const char *device, int64_t size, Error **errp)
{
BlockDriverState *bs;
int ret;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (size < 0) {
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
return;
}
/* complete all in-flight operations before resizing the device */
bdrv_drain_all();
ret = bdrv_truncate(bs, size);
switch (ret) {
case 0:
break;
case -ENOMEDIUM:
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
break;
case -ENOTSUP:
error_set(errp, QERR_UNSUPPORTED);
break;
case -EACCES:
error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
break;
case -EBUSY:
error_set(errp, QERR_DEVICE_IN_USE, device);
break;
default:
error_setg_errno(errp, -ret, "Could not resize");
break;
}
}
static void block_job_cb(void *opaque, int ret)
{
BlockDriverState *bs = opaque;
QObject *obj;
trace_block_job_cb(bs, bs->job, ret);
assert(bs->job);
obj = qobject_from_block_job(bs->job);
if (ret < 0) {
QDict *dict = qobject_to_qdict(obj);
qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
}
if (block_job_is_cancelled(bs->job)) {
monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
} else {
monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
}
qobject_decref(obj);
bdrv_put_ref_bh_schedule(bs);
}
void qmp_block_stream(const char *device, bool has_base,
const char *base, bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *base_bs = NULL;
Error *local_err = NULL;
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (base) {
base_bs = bdrv_find_backing_image(bs, base);
if (base_bs == NULL) {
error_set(errp, QERR_BASE_NOT_FOUND, base);
return;
}
}
stream_start(bs, base_bs, base, has_speed ? speed : 0,
on_error, block_job_cb, bs, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
trace_qmp_block_stream(bs, bs->job);
}
void qmp_block_commit(const char *device,
bool has_base, const char *base, const char *top,
bool has_speed, int64_t speed,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *base_bs, *top_bs;
Error *local_err = NULL;
/* This will be part of the QMP command, if/when the
* BlockdevOnError change for blkmirror makes it in
*/
BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
/* drain all i/o before commits */
bdrv_drain_all();
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
/* default top_bs is the active layer */
top_bs = bs;
if (top) {
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");
return;
}
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) {
error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
return;
}
commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
&local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return;
}
}
void qmp_drive_backup(const char *device, const char *target,
bool has_format, const char *format,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
bool has_speed, int64_t speed,
bool has_on_source_error, BlockdevOnError on_source_error,
bool has_on_target_error, BlockdevOnError on_target_error,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
int64_t size;
int ret;
if (!has_speed) {
speed = 0;
}
if (!has_on_source_error) {
on_source_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_on_target_error) {
on_target_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (format) {
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
}
if (bdrv_in_use(bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
flags = bs->open_flags | BDRV_O_RDWR;
/* See if we have a backing HD we can use to create our new image
* on top of. */
if (sync == MIRROR_SYNC_MODE_TOP) {
source = bs->backing_hd;
if (!source) {
sync = MIRROR_SYNC_MODE_FULL;
}
}
if (sync == MIRROR_SYNC_MODE_NONE) {
source = bs;
}
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
return;
}
if (mode != NEW_IMAGE_MODE_EXISTING) {
assert(format && drv);
if (source) {
bdrv_img_create(target, format, source->filename,
source->drv->format_name, NULL,
size, flags, &local_err, false);
} else {
bdrv_img_create(target, format, NULL, NULL, NULL,
size, flags, &local_err, false);
}
}
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
if (ret < 0) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}
backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}
}
#define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
void qmp_drive_mirror(const char *device, const char *target,
bool has_format, const char *format,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
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,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
int64_t size;
int ret;
if (!has_speed) {
speed = 0;
}
if (!has_on_source_error) {
on_source_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_on_target_error) {
on_target_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
if (!has_granularity) {
granularity = 0;
}
if (!has_buf_size) {
buf_size = DEFAULT_MIRROR_BUF_SIZE;
}
if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
error_set(errp, QERR_INVALID_PARAMETER, device);
return;
}
if (granularity & (granularity - 1)) {
error_set(errp, QERR_INVALID_PARAMETER, device);
return;
}
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (format) {
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
}
if (bdrv_in_use(bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
flags = bs->open_flags | BDRV_O_RDWR;
source = bs->backing_hd;
if (!source && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
return;
}
if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
/* create new image w/o backing file */
assert(format && drv);
bdrv_img_create(target, format,
NULL, NULL, NULL, size, flags, &local_err, false);
} else {
switch (mode) {
case NEW_IMAGE_MODE_EXISTING:
break;
case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
/* create new image with backing file */
bdrv_img_create(target, format,
source->filename,
source->drv->format_name,
NULL, size, flags, &local_err, false);
break;
default:
abort();
}
}
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
/* Mirroring takes care of copy-on-write using the source's backing
* file.
*/
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
&local_err);
if (ret < 0) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}
mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
on_source_error, on_target_error,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}
}
static BlockJob *find_block_job(const char *device)
{
BlockDriverState *bs;
bs = bdrv_find(device);
if (!bs || !bs->job) {
return NULL;
}
return bs->job;
}
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
{
BlockJob *job = find_block_job(device);
if (!job) {
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
block_job_set_speed(job, speed, errp);
}
void qmp_block_job_cancel(const char *device,
bool has_force, bool force, Error **errp)
{
BlockJob *job = find_block_job(device);
if (!has_force) {
force = false;
}
if (!job) {
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
if (job->paused && !force) {
error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
return;
}
trace_qmp_block_job_cancel(job);
block_job_cancel(job);
}
void qmp_block_job_pause(const char *device, Error **errp)
{
BlockJob *job = find_block_job(device);
if (!job) {
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
trace_qmp_block_job_pause(job);
block_job_pause(job);
}
void qmp_block_job_resume(const char *device, Error **errp)
{
BlockJob *job = find_block_job(device);
if (!job) {
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
trace_qmp_block_job_resume(job);
block_job_resume(job);
}
void qmp_block_job_complete(const char *device, Error **errp)
{
BlockJob *job = find_block_job(device);
if (!job) {
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
trace_qmp_block_job_complete(job);
block_job_complete(job, errp);
}
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
{
BlockJobInfoList **prev = opaque;
BlockJob *job = bs->job;
if (job) {
BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
elem->value = block_job_query(bs->job);
(*prev)->next = elem;
*prev = elem;
}
}
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
/* Dummy is a fake list element for holding the head pointer */
BlockJobInfoList dummy = {};
BlockJobInfoList *prev = &dummy;
bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
return dummy.next;
}
QemuOptsList qemu_common_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
.desc = {
{
.name = "bus",
.type = QEMU_OPT_NUMBER,
.help = "bus number",
},{
.name = "unit",
.type = QEMU_OPT_NUMBER,
.help = "unit number (i.e. lun for scsi)",
},{
.name = "if",
.type = QEMU_OPT_STRING,
.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
},{
.name = "index",
.type = QEMU_OPT_NUMBER,
.help = "index number",
},{
.name = "cyls",
.type = QEMU_OPT_NUMBER,
.help = "number of cylinders (ide disk geometry)",
},{
.name = "heads",
.type = QEMU_OPT_NUMBER,
.help = "number of heads (ide disk geometry)",
},{
.name = "secs",
.type = QEMU_OPT_NUMBER,
.help = "number of sectors (ide disk geometry)",
},{
.name = "trans",
.type = QEMU_OPT_STRING,
.help = "chs translation (auto, lba. none)",
},{
.name = "media",
.type = QEMU_OPT_STRING,
.help = "media type (disk, cdrom)",
},{
.name = "snapshot",
.type = QEMU_OPT_BOOL,
.help = "enable/disable snapshot mode",
},{
.name = "file",
.type = QEMU_OPT_STRING,
.help = "disk image",
},{
.name = "discard",
.type = QEMU_OPT_STRING,
.help = "discard operation (ignore/off, unmap/on)",
},{
.name = "cache.writeback",
.type = QEMU_OPT_BOOL,
.help = "enables writeback mode for any caches",
},{
.name = "cache.direct",
.type = QEMU_OPT_BOOL,
.help = "enables use of O_DIRECT (bypass the host page cache)",
},{
.name = "cache.no-flush",
.type = QEMU_OPT_BOOL,
.help = "ignore any flush requests for the device",
},{
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
},{
.name = "format",
.type = QEMU_OPT_STRING,
.help = "disk format (raw, qcow2, ...)",
},{
.name = "serial",
.type = QEMU_OPT_STRING,
.help = "disk serial number",
},{
.name = "rerror",
.type = QEMU_OPT_STRING,
.help = "read error action",
},{
.name = "werror",
.type = QEMU_OPT_STRING,
.help = "write error action",
},{
.name = "addr",
.type = QEMU_OPT_STRING,
.help = "pci address (virtio only)",
},{
.name = "read-only",
.type = QEMU_OPT_BOOL,
.help = "open drive file as read-only",
},{
.name = "throttling.iops-total",
.type = QEMU_OPT_NUMBER,
.help = "limit total I/O operations per second",
},{
.name = "throttling.iops-read",
.type = QEMU_OPT_NUMBER,
.help = "limit read operations per second",
},{
.name = "throttling.iops-write",
.type = QEMU_OPT_NUMBER,
.help = "limit write operations per second",
},{
.name = "throttling.bps-total",
.type = QEMU_OPT_NUMBER,
.help = "limit total bytes per second",
},{
.name = "throttling.bps-read",
.type = QEMU_OPT_NUMBER,
.help = "limit read bytes per second",
},{
.name = "throttling.bps-write",
.type = QEMU_OPT_NUMBER,
.help = "limit write bytes per second",
},{
.name = "throttling.iops-total-max",
.type = QEMU_OPT_NUMBER,
.help = "I/O operations burst",
},{
.name = "throttling.iops-read-max",
.type = QEMU_OPT_NUMBER,
.help = "I/O operations read burst",
},{
.name = "throttling.iops-write-max",
.type = QEMU_OPT_NUMBER,
.help = "I/O operations write burst",
},{
.name = "throttling.bps-total-max",
.type = QEMU_OPT_NUMBER,
.help = "total bytes burst",
},{
.name = "throttling.bps-read-max",
.type = QEMU_OPT_NUMBER,
.help = "total bytes read burst",
},{
.name = "throttling.bps-write-max",
.type = QEMU_OPT_NUMBER,
.help = "total bytes write burst",
},{
.name = "throttling.iops-size",
.type = QEMU_OPT_NUMBER,
.help = "when limiting by iops max size of an I/O in bytes",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},{
.name = "boot",
.type = QEMU_OPT_BOOL,
.help = "(deprecated, ignored)",
},
{ /* end of list */ }
},
};
QemuOptsList qemu_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
.desc = {
/*
* no elements => accept any params
* validation will happen later
*/
{ /* end of list */ }
},
};
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