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qemu-e2k/blockdev.c
Ian Main fc5d3f8432 Implement sync modes for drive-backup. 
This patch adds sync-modes to the drive-backup interface and
implements the FULL, NONE and TOP modes of synchronization.

FULL performs as before copying the entire contents of the drive
while preserving the point-in-time using CoW.
NONE only copies new writes to the target drive.
TOP copies changes to the topmost drive image and preserves the
point-in-time using CoW.

For sync mode TOP are creating a new target image using the same backing
file as the original disk image.  Then any new data that has been laid
on top of it since creation is copied in the main backup_run() loop.
There is an extra check in the 'TOP' case so that we don't bother to copy
all the data of the backing file as it already exists in the target.
This is where the bdrv_co_is_allocated() is used to determine if the
data exists in the topmost layer or below.

Also any new data being written is intercepted via the write_notifier
hook which ends up calling backup_do_cow() to copy old data out before
it gets overwritten.

For mode 'NONE' we create the new target image and only copy in the
original data from the disk image starting from the time the call was
made.  This preserves the point in time data by only copying the parts
that are *going to change* to the target image.  This way we can
reconstruct the final image by checking to see if the given block exists
in the new target image first, and if it does not, you can get it from
the original image.  This is basically an optimization allowing you to
do point-in-time snapshots with low overhead vs the 'FULL' version.

Since there is no old data to copy out the loop in backup_run() for the
NONE case just calls qemu_coroutine_yield() which only wakes up after
an event (usually cancel in this case).  The rest is handled by the
before_write notifier which again calls backup_do_cow() to write out
the old data so it can be preserved.

Signed-off-by: Ian Main <imain@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-07-26 22:01:31 +02:00

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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_delete(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;
DriveInfo *dinfo;
} DrivePutRefBH;
static void drive_put_ref_bh(void *opaque)
{
DrivePutRefBH *s = opaque;
drive_put_ref(s->dinfo);
qemu_bh_delete(s->bh);
g_free(s);
}
/*
* Release a drive reference in a BH
*
* It is not possible to use drive_put_ref() from a callback function when the
* callers still need the drive. In such cases we schedule a BH to release the
* reference.
*/
static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
{
DrivePutRefBH *s;
s = g_new(DrivePutRefBH, 1);
s->bh = qemu_bh_new(drive_put_ref_bh, s);
s->dinfo = dinfo;
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 do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
{
bool bps_flag;
bool iops_flag;
assert(io_limits);
bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
&& ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
|| (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
&& ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
|| (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
if (bps_flag || iops_flag) {
error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
"cannot be used at the same time");
return false;
}
if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
error_setg(errp, "bps and iops 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;
BlockIOLimit io_limits;
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;
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;
}
}
bdrv_flags = 0;
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", true)) {
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;
}
qdict_put(bs_opts, "driver", qstring_from_str(buf));
}
/* disk I/O throttling */
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] =
qemu_opt_get_number(opts, "throttling.bps-total", 0);
io_limits.bps[BLOCK_IO_LIMIT_READ] =
qemu_opt_get_number(opts, "throttling.bps-read", 0);
io_limits.bps[BLOCK_IO_LIMIT_WRITE] =
qemu_opt_get_number(opts, "throttling.bps-write", 0);
io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
qemu_opt_get_number(opts, "throttling.iops-total", 0);
io_limits.iops[BLOCK_IO_LIMIT_READ] =
qemu_opt_get_number(opts, "throttling.iops-read", 0);
io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
qemu_opt_get_number(opts, "throttling.iops-write", 0);
if (!do_check_io_limits(&io_limits, &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 */
bdrv_set_io_limits(dinfo->bdrv, &io_limits);
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, NULL);
if (ret < 0) {
if (ret == -EMEDIUMTYPE) {
error_report("could not open disk image %s: not in %s format",
file ?: dinfo->id, qdict_get_str(bs_opts, "driver"));
} else {
error_report("could not open disk image %s: %s",
file ?: dinfo->id, strerror(-ret));
}
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_delete(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, "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);
}
/* 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;
};
/* 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);
if (ret != 0) {
error_setg_file_open(errp, -ret, new_image_file);
}
}
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_delete(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)
{
assert(false); /* 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,
},
};
/*
* '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];
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)
{
int ret;
ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv);
if (ret < 0) {
error_setg_file_open(errp, -ret, filename);
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, Error **errp)
{
BlockIOLimit io_limits;
BlockDriverState *bs;
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd;
io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
if (!do_check_io_limits(&io_limits, errp)) {
return;
}
bs->io_limits = io_limits;
if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
bdrv_io_limits_enable(bs);
} else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
bdrv_io_limits_disable(bs);
} else {
if (bs->block_timer) {
qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
}
}
}
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);
drive_put_ref_bh_schedule(drive_get_by_blockdev(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;
}
/* Grab a reference so hotplug does not delete the BlockDriverState from
* underneath us.
*/
drive_get_ref(drive_get_by_blockdev(bs));
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;
}
/* Grab a reference so hotplug does not delete the BlockDriverState from
* underneath us.
*/
drive_get_ref(drive_get_by_blockdev(bs));
}
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);
if (ret < 0) {
bdrv_delete(target_bs);
error_setg_file_open(errp, -ret, target);
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_delete(target_bs);
error_propagate(errp, local_err);
return;
}
/* Grab a reference so hotplug does not delete the BlockDriverState from
* underneath us.
*/
drive_get_ref(drive_get_by_blockdev(bs));
}
#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:
ret = 0;
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);
if (ret < 0) {
bdrv_delete(target_bs);
error_setg_file_open(errp, -ret, target);
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_delete(target_bs);
error_propagate(errp, local_err);
return;
}
/* Grab a reference so hotplug does not delete the BlockDriverState from
* underneath us.
*/
drive_get_ref(drive_get_by_blockdev(bs));
}
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 = "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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