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qemu/blockdev.c
Wen Congyang e12f378409 block: more check for replaced node 
We use mirror+replace to fix quorum's broken child. bs/s->common.bs
is quorum, and to_replace is the broken child. The new child is target_bs.
Without this patch, the replace node can be any node, and it can be
top BDS with BB, or another quorum's child. We just check if the broken
child is part of the quorum BDS in this patch.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Message-id: 55A86486.1000404@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-09-02 14:56:39 +01:00

3252 lines
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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/block-backend.h"
#include "sysemu/blockdev.h"
#include "hw/block/block.h"
#include "block/blockjob.h"
#include "block/throttle-groups.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qapi/qmp/types.h"
#include "qapi-visit.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/util.h"
#include "sysemu/sysemu.h"
#include "block/block_int.h"
#include "qmp-commands.h"
#include "trace.h"
#include "sysemu/arch_init.h"
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 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,
};
/**
* Boards may call this to offer board-by-board overrides
* of the default, global values.
*/
void override_max_devs(BlockInterfaceType type, int max_devs)
{
BlockBackend *blk;
DriveInfo *dinfo;
if (max_devs <= 0) {
return;
}
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
dinfo = blk_legacy_dinfo(blk);
if (dinfo->type == type) {
fprintf(stderr, "Cannot override units-per-bus property of"
" the %s interface, because a drive of that type has"
" already been added.\n", if_name[type]);
g_assert_not_reached();
}
}
if_max_devs[type] = max_devs;
}
/*
* 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(BlockBackend *blk)
{
DriveInfo *dinfo = blk_legacy_dinfo(blk);
BlockDriverState *bs = blk_bs(blk);
AioContext *aio_context;
if (!dinfo) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bs->job) {
block_job_cancel(bs->job);
}
aio_context_release(aio_context);
dinfo->auto_del = 1;
}
void blockdev_auto_del(BlockBackend *blk)
{
DriveInfo *dinfo = blk_legacy_dinfo(blk);
if (dinfo && dinfo->auto_del) {
blk_unref(blk);
}
}
/**
* Returns the current mapping of how many units per bus
* a particular interface can support.
*
* A positive integer indicates n units per bus.
* 0 implies the mapping has not been established.
* -1 indicates an invalid BlockInterfaceType was given.
*/
int drive_get_max_devs(BlockInterfaceType type)
{
if (type >= IF_IDE && type < IF_COUNT) {
return if_max_devs[type];
}
return -1;
}
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_noisily(qemu_find_opts("drive"), optstr, false);
}
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
QemuOpts *opts;
opts = drive_def(optstr);
if (!opts) {
return NULL;
}
if (type != IF_DEFAULT) {
qemu_opt_set(opts, "if", if_name[type], &error_abort);
}
if (index >= 0) {
qemu_opt_set_number(opts, "index", index, &error_abort);
}
if (file)
qemu_opt_set(opts, "file", file, &error_abort);
return opts;
}
DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
BlockBackend *blk;
DriveInfo *dinfo;
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
dinfo = blk_legacy_dinfo(blk);
if (dinfo && dinfo->type == type
&& dinfo->bus == bus && dinfo->unit == unit) {
return dinfo;
}
}
return NULL;
}
bool drive_check_orphaned(void)
{
BlockBackend *blk;
DriveInfo *dinfo;
bool rs = false;
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
dinfo = blk_legacy_dinfo(blk);
/* If dinfo->bdrv->dev is NULL, it has no device attached. */
/* Unless this is a default drive, this may be an oversight. */
if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
dinfo->type != IF_NONE) {
fprintf(stderr, "Warning: Orphaned drive without device: "
"id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
dinfo->bus, dinfo->unit);
rs = true;
}
}
return rs;
}
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;
BlockBackend *blk;
DriveInfo *dinfo;
max_bus = -1;
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
dinfo = blk_legacy_dinfo(blk);
if (dinfo && 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]++);
}
static void bdrv_format_print(void *opaque, const char *name)
{
error_printf(" %s", name);
}
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, Error **errp)
{
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_setg(errp, "'%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;
}
if (throttle_max_is_missing_limit(cfg)) {
error_setg(errp, "bps_max/iops_max require corresponding"
" bps/iops values");
return false;
}
return true;
}
typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
/* Takes the ownership of bs_opts */
static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
Error **errp)
{
const char *buf;
int ro = 0;
int bdrv_flags = 0;
int on_read_error, on_write_error;
BlockBackend *blk;
BlockDriverState *bs;
ThrottleConfig cfg;
int snapshot = 0;
bool copy_on_read;
Error *error = NULL;
QemuOpts *opts;
const char *id;
bool has_driver_specific_opts;
BlockdevDetectZeroesOptions detect_zeroes;
const char *throttling_group;
/* Check common options by copying from bs_opts to opts, all other options
* stay in bs_opts for processing by bdrv_open(). */
id = qdict_get_try_str(bs_opts, "id");
opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
if (error) {
error_propagate(errp, error);
goto err_no_opts;
}
qemu_opts_absorb_qdict(opts, bs_opts, &error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
if (id) {
qdict_del(bs_opts, "id");
}
has_driver_specific_opts = !!qdict_size(bs_opts);
/* extract parameters */
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);
if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
error_setg(errp, "invalid discard option");
goto early_err;
}
}
if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
bdrv_flags |= BDRV_O_CACHE_WB;
}
if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
bdrv_flags |= BDRV_O_NOCACHE;
}
if (qemu_opt_get_bool(opts, BDRV_OPT_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_setg(errp, "invalid aio option");
goto early_err;
}
}
#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");
goto early_err;
}
if (qdict_haskey(bs_opts, "driver")) {
error_setg(errp, "Cannot specify both 'driver' and 'format'");
goto early_err;
}
qdict_put(bs_opts, "driver", qstring_from_str(buf));
}
/* 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);
throttling_group = qemu_opt_get(opts, "throttling.group");
if (!check_throttle_config(&cfg, &error)) {
error_propagate(errp, error);
goto early_err;
}
on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
on_write_error = parse_block_error_action(buf, 0, &error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
}
on_read_error = BLOCKDEV_ON_ERROR_REPORT;
if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
on_read_error = parse_block_error_action(buf, 1, &error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
}
detect_zeroes =
qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
qemu_opt_get(opts, "detect-zeroes"),
BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
&error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
!(bdrv_flags & BDRV_O_UNMAP)) {
error_setg(errp, "setting detect-zeroes to unmap is not allowed "
"without setting discard operation to unmap");
goto early_err;
}
/* init */
if ((!file || !*file) && !has_driver_specific_opts) {
blk = blk_new_with_bs(qemu_opts_id(opts), errp);
if (!blk) {
goto early_err;
}
bs = blk_bs(blk);
bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
bs->read_only = ro;
QDECREF(bs_opts);
} else {
if (file && !*file) {
file = NULL;
}
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;
}
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
errp);
if (!blk) {
goto err_no_bs_opts;
}
bs = blk_bs(blk);
}
bs->detect_zeroes = detect_zeroes;
bdrv_set_on_error(bs, on_read_error, on_write_error);
/* disk I/O throttling */
if (throttle_enabled(&cfg)) {
if (!throttling_group) {
throttling_group = blk_name(blk);
}
bdrv_io_limits_enable(bs, throttling_group);
bdrv_set_io_limits(bs, &cfg);
}
if (bdrv_key_required(bs)) {
autostart = 0;
}
err_no_bs_opts:
qemu_opts_del(opts);
return blk;
early_err:
qemu_opts_del(opts);
err_no_opts:
QDECREF(bs_opts);
return NULL;
}
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
Error **errp)
{
const char *value;
value = qemu_opt_get(opts, from);
if (value) {
if (qemu_opt_find(opts, to)) {
error_setg(errp, "'%s' and its alias '%s' can't be used at the "
"same time", to, from);
return;
}
}
/* rename all items in opts */
while ((value = qemu_opt_get(opts, from))) {
qemu_opt_set(opts, to, value, &error_abort);
qemu_opt_unset(opts, from);
}
}
QemuOptsList qemu_legacy_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_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 = "index",
.type = QEMU_OPT_NUMBER,
.help = "index number",
},{
.name = "media",
.type = QEMU_OPT_STRING,
.help = "media type (disk, cdrom)",
},{
.name = "if",
.type = QEMU_OPT_STRING,
.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
},{
.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 = "boot",
.type = QEMU_OPT_BOOL,
.help = "(deprecated, ignored)",
},{
.name = "addr",
.type = QEMU_OPT_STRING,
.help = "pci address (virtio only)",
},{
.name = "serial",
.type = QEMU_OPT_STRING,
.help = "disk serial number",
},{
.name = "file",
.type = QEMU_OPT_STRING,
.help = "file name",
},
/* Options that are passed on, but have special semantics with -drive */
{
.name = "read-only",
.type = QEMU_OPT_BOOL,
.help = "open drive file as read-only",
},{
.name = "rerror",
.type = QEMU_OPT_STRING,
.help = "read error action",
},{
.name = "werror",
.type = QEMU_OPT_STRING,
.help = "write error action",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},
{ /* end of list */ }
},
};
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
{
const char *value;
BlockBackend *blk;
DriveInfo *dinfo = NULL;
QDict *bs_opts;
QemuOpts *legacy_opts;
DriveMediaType media = MEDIA_DISK;
BlockInterfaceType type;
int cyls, heads, secs, translation;
int max_devs, bus_id, unit_id, index;
const char *devaddr;
const char *werror, *rerror;
bool read_only = false;
bool copy_on_read;
const char *serial;
const char *filename;
Error *local_err = NULL;
int i;
/* Change legacy command line options into QMP ones */
static const struct {
const char *from;
const char *to;
} opt_renames[] = {
{ "iops", "throttling.iops-total" },
{ "iops_rd", "throttling.iops-read" },
{ "iops_wr", "throttling.iops-write" },
{ "bps", "throttling.bps-total" },
{ "bps_rd", "throttling.bps-read" },
{ "bps_wr", "throttling.bps-write" },
{ "iops_max", "throttling.iops-total-max" },
{ "iops_rd_max", "throttling.iops-read-max" },
{ "iops_wr_max", "throttling.iops-write-max" },
{ "bps_max", "throttling.bps-total-max" },
{ "bps_rd_max", "throttling.bps-read-max" },
{ "bps_wr_max", "throttling.bps-write-max" },
{ "iops_size", "throttling.iops-size" },
{ "group", "throttling.group" },
{ "readonly", "read-only" },
};
for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
&local_err);
if (local_err) {
error_report_err(local_err);
return NULL;
}
}
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, BDRV_OPT_CACHE_WB)) {
qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
!!(flags & BDRV_O_CACHE_WB), &error_abort);
}
if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
!!(flags & BDRV_O_NOCACHE), &error_abort);
}
if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
!!(flags & BDRV_O_NO_FLUSH), &error_abort);
}
qemu_opt_unset(all_opts, "cache");
}
/* Get a QDict for processing the options */
bs_opts = qdict_new();
qemu_opts_to_qdict(all_opts, bs_opts);
legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
&error_abort);
qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
if (local_err) {
error_report_err(local_err);
goto fail;
}
/* Deprecated option boot=[on|off] */
if (qemu_opt_get(legacy_opts, "boot") != NULL) {
fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
"ignored. Future versions will reject this parameter. Please "
"update your scripts.\n");
}
/* Media type */
value = qemu_opt_get(legacy_opts, "media");
if (value) {
if (!strcmp(value, "disk")) {
media = MEDIA_DISK;
} else if (!strcmp(value, "cdrom")) {
media = MEDIA_CDROM;
read_only = true;
} else {
error_report("'%s' invalid media", value);
goto fail;
}
}
/* copy-on-read is disabled with a warning for read-only devices */
read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
if (read_only && copy_on_read) {
error_report("warning: disabling copy-on-read on read-only drive");
copy_on_read = false;
}
qdict_put(bs_opts, "read-only",
qstring_from_str(read_only ? "on" : "off"));
qdict_put(bs_opts, "copy-on-read",
qstring_from_str(copy_on_read ? "on" :"off"));
/* Controller type */
value = qemu_opt_get(legacy_opts, "if");
if (value) {
for (type = 0;
type < IF_COUNT && strcmp(value, if_name[type]);
type++) {
}
if (type == IF_COUNT) {
error_report("unsupported bus type '%s'", value);
goto fail;
}
} else {
type = block_default_type;
}
/* Geometry */
cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
heads = qemu_opt_get_number(legacy_opts, "heads", 0);
secs = qemu_opt_get_number(legacy_opts, "secs", 0);
if (cyls || heads || secs) {
if (cyls < 1) {
error_report("invalid physical cyls number");
goto fail;
}
if (heads < 1) {
error_report("invalid physical heads number");
goto fail;
}
if (secs < 1) {
error_report("invalid physical secs number");
goto fail;
}
}
translation = BIOS_ATA_TRANSLATION_AUTO;
value = qemu_opt_get(legacy_opts, "trans");
if (value != NULL) {
if (!cyls) {
error_report("'%s' trans must be used with cyls, heads and secs",
value);
goto fail;
}
if (!strcmp(value, "none")) {
translation = BIOS_ATA_TRANSLATION_NONE;
} else if (!strcmp(value, "lba")) {
translation = BIOS_ATA_TRANSLATION_LBA;
} else if (!strcmp(value, "large")) {
translation = BIOS_ATA_TRANSLATION_LARGE;
} else if (!strcmp(value, "rechs")) {
translation = BIOS_ATA_TRANSLATION_RECHS;
} else if (!strcmp(value, "auto")) {
translation = BIOS_ATA_TRANSLATION_AUTO;
} else {
error_report("'%s' invalid translation type", value);
goto fail;
}
}
if (media == MEDIA_CDROM) {
if (cyls || secs || heads) {
error_report("CHS can't be set with media=cdrom");
goto fail;
}
}
/* Device address specified by bus/unit or index.
* If none was specified, try to find the first free one. */
bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
index = qemu_opt_get_number(legacy_opts, "index", -1);
max_devs = if_max_devs[type];
if (index != -1) {
if (bus_id != 0 || unit_id != -1) {
error_report("index cannot be used with bus and unit");
goto fail;
}
bus_id = drive_index_to_bus_id(type, index);
unit_id = drive_index_to_unit_id(type, index);
}
if (unit_id == -1) {
unit_id = 0;
while (drive_get(type, bus_id, unit_id) != NULL) {
unit_id++;
if (max_devs && unit_id >= max_devs) {
unit_id -= max_devs;
bus_id++;
}
}
}
if (max_devs && unit_id >= max_devs) {
error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
goto fail;
}
if (drive_get(type, bus_id, unit_id) != NULL) {
error_report("drive with bus=%d, unit=%d (index=%d) exists",
bus_id, unit_id, index);
goto fail;
}
/* Serial number */
serial = qemu_opt_get(legacy_opts, "serial");
/* no id supplied -> create one */
if (qemu_opts_id(all_opts) == NULL) {
char *new_id;
const char *mediastr = "";
if (type == IF_IDE || type == IF_SCSI) {
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
}
if (max_devs) {
new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
mediastr, unit_id);
} else {
new_id = g_strdup_printf("%s%s%i", if_name[type],
mediastr, unit_id);
}
qdict_put(bs_opts, "id", qstring_from_str(new_id));
g_free(new_id);
}
/* Add virtio block device */
devaddr = qemu_opt_get(legacy_opts, "addr");
if (devaddr && type != IF_VIRTIO) {
error_report("addr is not supported by this bus type");
goto fail;
}
if (type == IF_VIRTIO) {
QemuOpts *devopts;
devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
&error_abort);
if (arch_type == QEMU_ARCH_S390X) {
qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
} else {
qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
}
qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
&error_abort);
if (devaddr) {
qemu_opt_set(devopts, "addr", devaddr, &error_abort);
}
}
filename = qemu_opt_get(legacy_opts, "file");
/* Check werror/rerror compatibility with if=... */
werror = qemu_opt_get(legacy_opts, "werror");
if (werror != NULL) {
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
type != IF_NONE) {
error_report("werror is not supported by this bus type");
goto fail;
}
qdict_put(bs_opts, "werror", qstring_from_str(werror));
}
rerror = qemu_opt_get(legacy_opts, "rerror");
if (rerror != NULL) {
if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
type != IF_NONE) {
error_report("rerror is not supported by this bus type");
goto fail;
}
qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
}
/* Actual block device init: Functionality shared with blockdev-add */
blk = blockdev_init(filename, bs_opts, &local_err);
bs_opts = NULL;
if (!blk) {
if (local_err) {
error_report_err(local_err);
}
goto fail;
} else {
assert(!local_err);
}
/* Create legacy DriveInfo */
dinfo = g_malloc0(sizeof(*dinfo));
dinfo->opts = all_opts;
dinfo->cyls = cyls;
dinfo->heads = heads;
dinfo->secs = secs;
dinfo->trans = translation;
dinfo->type = type;
dinfo->bus = bus_id;
dinfo->unit = unit_id;
dinfo->devaddr = devaddr;
dinfo->serial = g_strdup(serial);
blk_set_legacy_dinfo(blk, dinfo);
switch(type) {
case IF_IDE:
case IF_SCSI:
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
break;
default:
break;
}
fail:
qemu_opts_del(legacy_opts);
QDECREF(bs_opts);
return dinfo;
}
void hmp_commit(Monitor *mon, const QDict *qdict)
{
const char *device = qdict_get_str(qdict, "device");
BlockBackend *blk;
int ret;
if (!strcmp(device, "all")) {
ret = bdrv_commit_all();
} else {
blk = blk_by_name(device);
if (!blk) {
monitor_printf(mon, "Device '%s' not found\n", device);
return;
}
ret = bdrv_commit(blk_bs(blk));
}
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(bool has_device, const char *device,
bool has_node_name, const char *node_name,
const char *snapshot_file,
bool has_snapshot_node_name,
const char *snapshot_node_name,
bool has_format, const char *format,
bool has_mode, NewImageMode mode, Error **errp)
{
BlockdevSnapshot snapshot = {
.has_device = has_device,
.device = (char *) device,
.has_node_name = has_node_name,
.node_name = (char *) node_name,
.snapshot_file = (char *) snapshot_file,
.has_snapshot_node_name = has_snapshot_node_name,
.snapshot_node_name = (char *) snapshot_node_name,
.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;
BlockBackend *blk;
AioContext *aio_context;
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
int ret;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return NULL;
}
bs = blk_bs(blk);
if (!has_id) {
id = NULL;
}
if (!has_name) {
name = NULL;
}
if (!id && !name) {
error_setg(errp, "Name or id must be provided");
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
goto out_aio_context;
}
ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out_aio_context;
}
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);
goto out_aio_context;
}
bdrv_snapshot_delete(bs, id, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out_aio_context;
}
aio_context_release(aio_context);
info = g_new0(SnapshotInfo, 1);
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;
out_aio_context:
aio_context_release(aio_context);
return NULL;
}
/**
* block_dirty_bitmap_lookup:
* Return a dirty bitmap (if present), after validating
* the node reference and bitmap names.
*
* @node: The name of the BDS node to search for bitmaps
* @name: The name of the bitmap to search for
* @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
* @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
* @errp: Output pointer for error information. Can be NULL.
*
* @return: A bitmap object on success, or NULL on failure.
*/
static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
const char *name,
BlockDriverState **pbs,
AioContext **paio,
Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
AioContext *aio_context;
if (!node) {
error_setg(errp, "Node cannot be NULL");
return NULL;
}
if (!name) {
error_setg(errp, "Bitmap name cannot be NULL");
return NULL;
}
bs = bdrv_lookup_bs(node, node, NULL);
if (!bs) {
error_setg(errp, "Node '%s' not found", node);
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bitmap = bdrv_find_dirty_bitmap(bs, name);
if (!bitmap) {
error_setg(errp, "Dirty bitmap '%s' not found", name);
goto fail;
}
if (pbs) {
*pbs = bs;
}
if (paio) {
*paio = aio_context;
} else {
aio_context_release(aio_context);
}
return bitmap;
fail:
aio_context_release(aio_context);
return NULL;
}
/* New and old BlockDriverState structs for atomic group operations */
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;
AioContext *aio_context;
QEMUSnapshotInfo sn;
} InternalSnapshotState;
static void internal_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
Error *local_err = NULL;
const char *device;
const char *name;
BlockBackend *blk;
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 */
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(state->aio_context);
if (!bdrv_is_inserted(bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
return;
}
if (bdrv_is_read_only(bs)) {
error_setg(errp, "Device '%s' is read only", device);
return;
}
if (!bdrv_can_snapshot(bs)) {
error_setg(errp, "Block format '%s' used by device '%s' "
"does not support internal snapshots",
bs->drv->format_name, device);
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,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
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);
}
}
static void internal_snapshot_clean(BlkTransactionState *common)
{
InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
common, common);
if (state->aio_context) {
aio_context_release(state->aio_context);
}
}
/* external snapshot private data */
typedef struct ExternalSnapshotState {
BlkTransactionState common;
BlockDriverState *old_bs;
BlockDriverState *new_bs;
AioContext *aio_context;
} ExternalSnapshotState;
static void external_snapshot_prepare(BlkTransactionState *common,
Error **errp)
{
BlockDriver *drv;
int flags, ret;
QDict *options = NULL;
Error *local_err = NULL;
bool has_device = false;
const char *device;
bool has_node_name = false;
const char *node_name;
bool has_snapshot_node_name = false;
const char *snapshot_node_name;
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);
has_device = action->blockdev_snapshot_sync->has_device;
device = action->blockdev_snapshot_sync->device;
has_node_name = action->blockdev_snapshot_sync->has_node_name;
node_name = action->blockdev_snapshot_sync->node_name;
has_snapshot_node_name =
action->blockdev_snapshot_sync->has_snapshot_node_name;
snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
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_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
has_node_name ? node_name : NULL,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (has_node_name && !has_snapshot_node_name) {
error_setg(errp, "New snapshot node name missing");
return;
}
if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
error_setg(errp, "New snapshot node name already existing");
return;
}
/* Acquire AioContext now so any threads operating on old_bs stop */
state->aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(state->aio_context);
if (!bdrv_is_inserted(state->old_bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_op_is_blocked(state->old_bs,
BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
return;
}
if (!bdrv_is_read_only(state->old_bs)) {
if (bdrv_flush(state->old_bs)) {
error_setg(errp, QERR_IO_ERROR);
return;
}
}
if (!bdrv_is_first_non_filter(state->old_bs)) {
error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
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 (local_err) {
error_propagate(errp, local_err);
return;
}
}
if (has_snapshot_node_name) {
options = qdict_new();
qdict_put(options, "node-name",
qstring_from_str(snapshot_node_name));
}
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
assert(state->new_bs == NULL);
ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
flags | BDRV_O_NO_BACKING, drv, &local_err);
/* We will manually add the backing_hd field to the bs later */
if (ret != 0) {
error_propagate(errp, local_err);
}
}
static void external_snapshot_commit(BlkTransactionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
bdrv_set_aio_context(state->new_bs, state->aio_context);
/* 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);
aio_context_release(state->aio_context);
}
static void external_snapshot_abort(BlkTransactionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
if (state->new_bs) {
bdrv_unref(state->new_bs);
}
if (state->aio_context) {
aio_context_release(state->aio_context);
}
}
typedef struct DriveBackupState {
BlkTransactionState common;
BlockDriverState *bs;
AioContext *aio_context;
BlockJob *job;
} DriveBackupState;
static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
BlockDriverState *bs;
BlockBackend *blk;
DriveBackup *backup;
Error *local_err = NULL;
assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
backup = common->action->drive_backup;
blk = blk_by_name(backup->device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", backup->device);
return;
}
bs = blk_bs(blk);
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(state->aio_context);
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_bitmap, backup->bitmap,
backup->has_on_source_error, backup->on_source_error,
backup->has_on_target_error, backup->on_target_error,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
state->bs = bs;
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 drive_backup_clean(BlkTransactionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
if (state->aio_context) {
aio_context_release(state->aio_context);
}
}
typedef struct BlockdevBackupState {
BlkTransactionState common;
BlockDriverState *bs;
BlockJob *job;
AioContext *aio_context;
} BlockdevBackupState;
static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
BlockdevBackup *backup;
BlockDriverState *bs, *target;
BlockBackend *blk;
Error *local_err = NULL;
assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
backup = common->action->blockdev_backup;
blk = blk_by_name(backup->device);
if (!blk) {
error_setg(errp, "Device '%s' not found", backup->device);
return;
}
bs = blk_bs(blk);
blk = blk_by_name(backup->target);
if (!blk) {
error_setg(errp, "Device '%s' not found", backup->target);
return;
}
target = blk_bs(blk);
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
if (state->aio_context != bdrv_get_aio_context(target)) {
state->aio_context = NULL;
error_setg(errp, "Backup between two IO threads is not implemented");
return;
}
aio_context_acquire(state->aio_context);
qmp_blockdev_backup(backup->device, backup->target,
backup->sync,
backup->has_speed, backup->speed,
backup->has_on_source_error, backup->on_source_error,
backup->has_on_target_error, backup->on_target_error,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
state->bs = bs;
state->job = state->bs->job;
}
static void blockdev_backup_abort(BlkTransactionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
BlockDriverState *bs = state->bs;
/* Only cancel if it's the job we started */
if (bs && bs->job && bs->job == state->job) {
block_job_cancel_sync(bs->job);
}
}
static void blockdev_backup_clean(BlkTransactionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
if (state->aio_context) {
aio_context_release(state->aio_context);
}
}
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,
.clean = drive_backup_clean,
},
[TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
.instance_size = sizeof(BlockdevBackupState),
.prepare = blockdev_backup_prepare,
.abort = blockdev_backup_abort,
.clean = blockdev_backup_clean,
},
[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,
.clean = internal_snapshot_clean,
},
};
/*
* 'Atomic' group operations. The operations are performed as a set, and if
* any fail then we roll back all operations in the group.
*/
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 operations */
bdrv_drain_all();
/* We don't do anything in this loop that commits us to the operations */
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 (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; roll back all operations */
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(BlockBackend *blk, int force, Error **errp)
{
BlockDriverState *bs = blk_bs(blk);
AioContext *aio_context;
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
goto out;
}
if (!blk_dev_has_removable_media(blk)) {
error_setg(errp, "Device '%s' is not removable",
bdrv_get_device_name(bs));
goto out;
}
if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
blk_dev_eject_request(blk, force);
if (!force) {
error_setg(errp, "Device '%s' is locked",
bdrv_get_device_name(bs));
goto out;
}
}
bdrv_close(bs);
out:
aio_context_release(aio_context);
}
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
{
BlockBackend *blk;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
eject_device(blk, force, errp);
}
void qmp_block_passwd(bool has_device, const char *device,
bool has_node_name, const char *node_name,
const char *password, Error **errp)
{
Error *local_err = NULL;
BlockDriverState *bs;
AioContext *aio_context;
bs = bdrv_lookup_bs(has_device ? device : NULL,
has_node_name ? node_name : NULL,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_add_key(bs, password, errp);
aio_context_release(aio_context);
}
/* Assumes AioContext is held */
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, NULL, bdrv_flags, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return;
}
bdrv_add_key(bs, password, errp);
}
void qmp_change_blockdev(const char *device, const char *filename,
const char *format, Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
BlockDriver *drv = NULL;
int bdrv_flags;
Error *err = NULL;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (format) {
drv = bdrv_find_whitelisted_format(format, bs->read_only);
if (!drv) {
error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
goto out;
}
}
eject_device(blk, 0, &err);
if (err) {
error_propagate(errp, err);
goto out;
}
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);
out:
aio_context_release(aio_context);
}
/* 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,
bool has_group,
const char *group, Error **errp)
{
ThrottleConfig cfg;
BlockDriverState *bs;
BlockBackend *blk;
AioContext *aio_context;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
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;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (throttle_enabled(&cfg)) {
/* Enable I/O limits if they're not enabled yet, otherwise
* just update the throttling group. */
if (!bs->io_limits_enabled) {
bdrv_io_limits_enable(bs, has_group ? group : device);
} else if (has_group) {
bdrv_io_limits_update_group(bs, group);
}
/* Set the new throttling configuration */
bdrv_set_io_limits(bs, &cfg);
} else if (bs->io_limits_enabled) {
/* If all throttling settings are set to 0, disable I/O limits */
bdrv_io_limits_disable(bs);
}
aio_context_release(aio_context);
}
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
bool has_granularity, uint32_t granularity,
Error **errp)
{
AioContext *aio_context;
BlockDriverState *bs;
if (!name || name[0] == '\0') {
error_setg(errp, "Bitmap name cannot be empty");
return;
}
bs = bdrv_lookup_bs(node, node, errp);
if (!bs) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (has_granularity) {
if (granularity < 512 || !is_power_of_2(granularity)) {
error_setg(errp, "Granularity must be power of 2 "
"and at least 512");
goto out;
}
} else {
/* Default to cluster size, if available: */
granularity = bdrv_get_default_bitmap_granularity(bs);
}
bdrv_create_dirty_bitmap(bs, granularity, name, errp);
out:
aio_context_release(aio_context);
}
void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
Error **errp)
{
AioContext *aio_context;
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
if (!bitmap || !bs) {
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be removed",
name);
goto out;
}
bdrv_dirty_bitmap_make_anon(bitmap);
bdrv_release_dirty_bitmap(bs, bitmap);
out:
aio_context_release(aio_context);
}
/**
* Completely clear a bitmap, for the purposes of synchronizing a bitmap
* immediately after a full backup operation.
*/
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
Error **errp)
{
AioContext *aio_context;
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
if (!bitmap || !bs) {
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be modified",
name);
goto out;
} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently disabled and cannot be cleared",
name);
goto out;
}
bdrv_clear_dirty_bitmap(bitmap);
out:
aio_context_release(aio_context);
}
void hmp_drive_del(Monitor *mon, const QDict *qdict)
{
const char *id = qdict_get_str(qdict, "id");
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
Error *local_err = NULL;
blk = blk_by_name(id);
if (!blk) {
error_report("Device '%s' not found", id);
return;
}
bs = blk_bs(blk);
if (!blk_legacy_dinfo(blk)) {
error_report("Deleting device added with blockdev-add"
" is not supported");
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
error_report_err(local_err);
aio_context_release(aio_context);
return;
}
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 (blk_get_attached_dev(blk)) {
blk_hide_on_behalf_of_hmp_drive_del(blk);
/* Further I/O must not pause the guest */
bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
BLOCKDEV_ON_ERROR_REPORT);
} else {
blk_unref(blk);
}
aio_context_release(aio_context);
}
void qmp_block_resize(bool has_device, const char *device,
bool has_node_name, const char *node_name,
int64_t size, Error **errp)
{
Error *local_err = NULL;
BlockDriverState *bs;
AioContext *aio_context;
int ret;
bs = bdrv_lookup_bs(has_device ? device : NULL,
has_node_name ? node_name : NULL,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!bdrv_is_first_non_filter(bs)) {
error_setg(errp, QERR_FEATURE_DISABLED, "resize");
goto out;
}
if (size < 0) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
goto out;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
error_setg(errp, QERR_DEVICE_IN_USE, device);
goto out;
}
/* 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_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
break;
case -ENOTSUP:
error_setg(errp, QERR_UNSUPPORTED);
break;
case -EACCES:
error_setg(errp, "Device '%s' is read only", device);
break;
case -EBUSY:
error_setg(errp, QERR_DEVICE_IN_USE, device);
break;
default:
error_setg_errno(errp, -ret, "Could not resize");
break;
}
out:
aio_context_release(aio_context);
}
static void block_job_cb(void *opaque, int ret)
{
/* Note that this function may be executed from another AioContext besides
* the QEMU main loop. If you need to access anything that assumes the
* QEMU global mutex, use a BH or introduce a mutex.
*/
BlockDriverState *bs = opaque;
const char *msg = NULL;
trace_block_job_cb(bs, bs->job, ret);
assert(bs->job);
if (ret < 0) {
msg = strerror(-ret);
}
if (block_job_is_cancelled(bs->job)) {
block_job_event_cancelled(bs->job);
} else {
block_job_event_completed(bs->job, msg);
}
bdrv_put_ref_bh_schedule(bs);
}
void qmp_block_stream(const char *device,
bool has_base, const char *base,
bool has_backing_file, const char *backing_file,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *base_bs = NULL;
AioContext *aio_context;
Error *local_err = NULL;
const char *base_name = NULL;
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
goto out;
}
if (has_base) {
base_bs = bdrv_find_backing_image(bs, base);
if (base_bs == NULL) {
error_setg(errp, QERR_BASE_NOT_FOUND, base);
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
base_name = base;
}
/* if we are streaming the entire chain, the result will have no backing
* file, and specifying one is therefore an error */
if (base_bs == NULL && has_backing_file) {
error_setg(errp, "backing file specified, but streaming the "
"entire chain");
goto out;
}
/* backing_file string overrides base bs filename */
base_name = has_backing_file ? backing_file : base_name;
stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
on_error, block_job_cb, bs, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
trace_qmp_block_stream(bs, bs->job);
out:
aio_context_release(aio_context);
}
void qmp_block_commit(const char *device,
bool has_base, const char *base,
bool has_top, const char *top,
bool has_backing_file, const char *backing_file,
bool has_speed, int64_t speed,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *base_bs, *top_bs;
AioContext *aio_context;
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;
if (!has_speed) {
speed = 0;
}
/* Important Note:
* libvirt relies on the DeviceNotFound error class in order to probe for
* live commit feature versions; for this to work, we must make sure to
* perform the device lookup before any generic errors that may occur in a
* scenario in which all optional arguments are omitted. */
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
goto out;
}
/* default top_bs is the active layer */
top_bs = bs;
if (has_top && 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");
goto out;
}
assert(bdrv_get_aio_context(top_bs) == aio_context);
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_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
goto out;
}
/* Do not allow attempts to commit an image into itself */
if (top_bs == base_bs) {
error_setg(errp, "cannot commit an image into itself");
goto out;
}
if (top_bs == bs) {
if (has_backing_file) {
error_setg(errp, "'backing-file' specified,"
" but 'top' is the active layer");
goto out;
}
commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
bs, &local_err);
} else {
commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
has_backing_file ? backing_file : NULL, &local_err);
}
if (local_err != NULL) {
error_propagate(errp, local_err);
goto out;
}
out:
aio_context_release(aio_context);
}
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_bitmap, const char *bitmap,
bool has_on_source_error, BlockdevOnError on_source_error,
bool has_on_target_error, BlockdevOnError on_target_error,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
BdrvDirtyBitmap *bmap = NULL;
AioContext *aio_context;
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;
}
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
/* Although backup_run has this check too, we need to use bs->drv below, so
* do an early check redundantly. */
if (!bdrv_is_inserted(bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
goto out;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (format) {
drv = bdrv_find_format(format);
if (!drv) {
error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
goto out;
}
}
/* Early check to avoid creating target */
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
goto out;
}
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");
goto out;
}
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 (local_err) {
error_propagate(errp, local_err);
goto out;
}
target_bs = NULL;
ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto out;
}
bdrv_set_aio_context(target_bs, aio_context);
if (has_bitmap) {
bmap = bdrv_find_dirty_bitmap(bs, bitmap);
if (!bmap) {
error_setg(errp, "Bitmap '%s' could not be found", bitmap);
goto out;
}
}
backup_start(bs, target_bs, speed, sync, bmap,
on_source_error, on_target_error,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
goto out;
}
out:
aio_context_release(aio_context);
}
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
return bdrv_named_nodes_list(errp);
}
void qmp_blockdev_backup(const char *device, const char *target,
enum MirrorSyncMode sync,
bool has_speed, int64_t speed,
bool has_on_source_error,
BlockdevOnError on_source_error,
bool has_on_target_error,
BlockdevOnError on_target_error,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *target_bs;
Error *local_err = NULL;
AioContext *aio_context;
if (!has_speed) {
speed = 0;
}
if (!has_on_source_error) {
on_source_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_on_target_error) {
on_target_error = BLOCKDEV_ON_ERROR_REPORT;
}
blk = blk_by_name(device);
if (!blk) {
error_setg(errp, "Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
blk = blk_by_name(target);
if (!blk) {
error_setg(errp, "Device '%s' not found", target);
goto out;
}
target_bs = blk_bs(blk);
bdrv_ref(target_bs);
bdrv_set_aio_context(target_bs, aio_context);
backup_start(bs, target_bs, speed, sync, NULL, 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);
}
out:
aio_context_release(aio_context);
}
void qmp_drive_mirror(const char *device, const char *target,
bool has_format, const char *format,
bool has_node_name, const char *node_name,
bool has_replaces, const char *replaces,
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,
bool has_unmap, bool unmap,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
AioContext *aio_context;
BlockDriver *drv = NULL;
Error *local_err = NULL;
QDict *options = 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 = 0;
}
if (!has_unmap) {
unmap = true;
}
if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
"a value in range [512B, 64MB]");
return;
}
if (granularity & (granularity - 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
"power of 2");
return;
}
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!bdrv_is_inserted(bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
goto out;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (format) {
drv = bdrv_find_format(format);
if (!drv) {
error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
goto out;
}
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
goto out;
}
flags = bs->open_flags | BDRV_O_RDWR;
source = bs->backing_hd;
if (!source && sync == MIRROR_SYNC_MODE_TOP) {
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");
goto out;
}
if (has_replaces) {
BlockDriverState *to_replace_bs;
AioContext *replace_aio_context;
int64_t replace_size;
if (!has_node_name) {
error_setg(errp, "a node-name must be provided when replacing a"
" named node of the graph");
goto out;
}
to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
if (!to_replace_bs) {
error_propagate(errp, local_err);
goto out;
}
replace_aio_context = bdrv_get_aio_context(to_replace_bs);
aio_context_acquire(replace_aio_context);
replace_size = bdrv_getlength(to_replace_bs);
aio_context_release(replace_aio_context);
if (size != replace_size) {
error_setg(errp, "cannot replace image with a mirror image of "
"different size");
goto out;
}
}
if ((sync == MIRROR_SYNC_MODE_FULL || !source)
&& 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 (local_err) {
error_propagate(errp, local_err);
goto out;
}
if (has_node_name) {
options = qdict_new();
qdict_put(options, "node-name", qstring_from_str(node_name));
}
/* Mirroring takes care of copy-on-write using the source's backing
* file.
*/
target_bs = NULL;
ret = bdrv_open(&target_bs, target, NULL, options,
flags | BDRV_O_NO_BACKING, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto out;
}
bdrv_set_aio_context(target_bs, aio_context);
/* pass the node name to replace to mirror start since it's loose coupling
* and will allow to check whether the node still exist at mirror completion
*/
mirror_start(bs, target_bs,
has_replaces ? replaces : NULL,
speed, granularity, buf_size, sync,
on_source_error, on_target_error,
unmap,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
goto out;
}
out:
aio_context_release(aio_context);
}
/* Get the block job for a given device name and acquire its AioContext */
static BlockJob *find_block_job(const char *device, AioContext **aio_context,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
blk = blk_by_name(device);
if (!blk) {
goto notfound;
}
bs = blk_bs(blk);
*aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(*aio_context);
if (!bs->job) {
aio_context_release(*aio_context);
goto notfound;
}
return bs->job;
notfound:
error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
"No active block job on device '%s'", device);
*aio_context = NULL;
return NULL;
}
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job) {
return;
}
block_job_set_speed(job, speed, errp);
aio_context_release(aio_context);
}
void qmp_block_job_cancel(const char *device,
bool has_force, bool force, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job) {
return;
}
if (!has_force) {
force = false;
}
if (job->user_paused && !force) {
error_setg(errp, "The block job for device '%s' is currently paused",
device);
goto out;
}
trace_qmp_block_job_cancel(job);
block_job_cancel(job);
out:
aio_context_release(aio_context);
}
void qmp_block_job_pause(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job || job->user_paused) {
return;
}
job->user_paused = true;
trace_qmp_block_job_pause(job);
block_job_pause(job);
aio_context_release(aio_context);
}
void qmp_block_job_resume(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job || !job->user_paused) {
return;
}
job->user_paused = false;
trace_qmp_block_job_resume(job);
block_job_resume(job);
aio_context_release(aio_context);
}
void qmp_block_job_complete(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_block_job_complete(job);
block_job_complete(job, errp);
aio_context_release(aio_context);
}
void qmp_change_backing_file(const char *device,
const char *image_node_name,
const char *backing_file,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs = NULL;
AioContext *aio_context;
BlockDriverState *image_bs = NULL;
Error *local_err = NULL;
bool ro;
int open_flags;
int ret;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
if (!image_bs) {
error_setg(errp, "image file not found");
goto out;
}
if (bdrv_find_base(image_bs) == image_bs) {
error_setg(errp, "not allowing backing file change on an image "
"without a backing file");
goto out;
}
/* even though we are not necessarily operating on bs, we need it to
* determine if block ops are currently prohibited on the chain */
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
goto out;
}
/* final sanity check */
if (!bdrv_chain_contains(bs, image_bs)) {
error_setg(errp, "'%s' and image file are not in the same chain",
device);
goto out;
}
/* if not r/w, reopen to make r/w */
open_flags = image_bs->open_flags;
ro = bdrv_is_read_only(image_bs);
if (ro) {
bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
}
ret = bdrv_change_backing_file(image_bs, backing_file,
image_bs->drv ? image_bs->drv->format_name : "");
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
backing_file);
/* don't exit here, so we can try to restore open flags if
* appropriate */
}
if (ro) {
bdrv_reopen(image_bs, open_flags, &local_err);
if (local_err) {
error_propagate(errp, local_err); /* will preserve prior errp */
}
}
out:
aio_context_release(aio_context);
}
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
QmpOutputVisitor *ov = qmp_output_visitor_new();
BlockBackend *blk;
QObject *obj;
QDict *qdict;
Error *local_err = NULL;
/* Require an ID in the top level */
if (!options->has_id) {
error_setg(errp, "Block device needs an ID");
goto fail;
}
/* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
* cache.direct=false instead of silently switching to aio=threads, except
* when called from drive_new().
*
* For now, simply forbidding the combination for all drivers will do. */
if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
bool direct = options->has_cache &&
options->cache->has_direct &&
options->cache->direct;
if (!direct) {
error_setg(errp, "aio=native requires cache.direct=true");
goto fail;
}
}
visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
&options, NULL, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto fail;
}
obj = qmp_output_get_qobject(ov);
qdict = qobject_to_qdict(obj);
qdict_flatten(qdict);
blk = blockdev_init(NULL, qdict, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto fail;
}
if (bdrv_key_required(blk_bs(blk))) {
blk_unref(blk);
error_setg(errp, "blockdev-add doesn't support encrypted devices");
goto fail;
}
fail:
qmp_output_visitor_cleanup(ov);
}
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
BlockJobInfoList *head = NULL, **p_next = &head;
BlockDriverState *bs;
for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bs->job) {
BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
elem->value = block_job_query(bs->job);
*p_next = elem;
p_next = &elem->next;
}
aio_context_release(aio_context);
}
return head;
}
QemuOptsList qemu_common_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
.desc = {
{
.name = "snapshot",
.type = QEMU_OPT_BOOL,
.help = "enable/disable snapshot mode",
},{
.name = "discard",
.type = QEMU_OPT_STRING,
.help = "discard operation (ignore/off, unmap/on)",
},{
.name = BDRV_OPT_CACHE_WB,
.type = QEMU_OPT_BOOL,
.help = "enables writeback mode for any caches",
},{
.name = BDRV_OPT_CACHE_DIRECT,
.type = QEMU_OPT_BOOL,
.help = "enables use of O_DIRECT (bypass the host page cache)",
},{
.name = BDRV_OPT_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 = "rerror",
.type = QEMU_OPT_STRING,
.help = "read error action",
},{
.name = "werror",
.type = QEMU_OPT_STRING,
.help = "write error action",
},{
.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 = "throttling.group",
.type = QEMU_OPT_STRING,
.help = "name of the block throttling group",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},{
.name = "detect-zeroes",
.type = QEMU_OPT_STRING,
.help = "try to optimize zero writes (off, on, unmap)",
},
{ /* 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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