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xemu/blockdev.c
Vladimir Sementsov-Ogievskiy ae9d441706 block: bdrv_append(): don't consume reference 
We have too much comments for this feature. It seems better just don't
do it. Most of real users (tests don't count) have to create additional
reference.

Drop also comment in external_snapshot_prepare:
 - bdrv_append doesn't "remove" old bs in common sense, it sounds
   strange
 - the fact that bdrv_append can fail is obvious from the context
 - the fact that we must rollback all changes in transaction abort is
   known (it's the direct role of abort)

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-5-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-04-30 12:27:47 +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 "qemu/osdep.h"
#include "sysemu/block-backend.h"
#include "sysemu/blockdev.h"
#include "hw/block/block.h"
#include "block/blockjob.h"
#include "block/qdict.h"
#include "block/throttle-groups.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/qemu-print.h"
#include "qemu/config-file.h"
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-transaction.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qnum.h"
#include "qapi/qmp/qstring.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qobject-output-visitor.h"
#include "sysemu/sysemu.h"
#include "sysemu/iothread.h"
#include "block/block_int.h"
#include "block/trace.h"
#include "sysemu/arch_init.h"
#include "sysemu/runstate.h"
#include "sysemu/replay.h"
#include "qemu/cutils.h"
#include "qemu/help_option.h"
#include "qemu/main-loop.h"
#include "qemu/throttle-options.h"
QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
void bdrv_set_monitor_owned(BlockDriverState *bs)
{
QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
}
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 implement 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);
BlockJob *job;
if (!dinfo) {
return;
}
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
if (block_job_has_bdrv(job, blk_bs(blk))) {
AioContext *aio_context = job->job.aio_context;
aio_context_acquire(aio_context);
job_cancel(&job->job, false);
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) {
monitor_remove_blk(blk);
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;
}
/*
* Check board claimed all -drive that are meant to be claimed.
* Fatal error if any remain unclaimed.
*/
void drive_check_orphaned(void)
{
BlockBackend *blk;
DriveInfo *dinfo;
Location loc;
bool orphans = false;
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
dinfo = blk_legacy_dinfo(blk);
/*
* Ignore default drives, because we create certain default
* drives unconditionally, then leave them unclaimed. Not the
* users fault.
* Ignore IF_VIRTIO, because it gets desugared into -device,
* so we can leave failing to -device.
* Ignore IF_NONE, because leaving unclaimed IF_NONE remains
* available for device_add is a feature.
*/
if (dinfo->is_default || dinfo->type == IF_VIRTIO
|| dinfo->type == IF_NONE) {
continue;
}
if (!blk_get_attached_dev(blk)) {
loc_push_none(&loc);
qemu_opts_loc_restore(dinfo->opts);
error_report("machine type does not support"
" if=%s,bus=%d,unit=%d",
if_name[dinfo->type], dinfo->bus, dinfo->unit);
loc_pop(&loc);
orphans = true;
}
}
if (orphans) {
exit(1);
}
}
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)
{
qemu_printf(" %s", name);
}
typedef struct {
QEMUBH *bh;
BlockDriverState *bs;
} BDRVPutRefBH;
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 parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
Error **errp)
{
const QListEntry *entry;
for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
switch (qobject_type(entry->value)) {
case QTYPE_QSTRING: {
unsigned long long length;
const char *str = qstring_get_str(qobject_to(QString,
entry->value));
if (parse_uint_full(str, &length, 10) == 0 &&
length > 0 && length <= UINT_MAX) {
block_acct_add_interval(stats, (unsigned) length);
} else {
error_setg(errp, "Invalid interval length: %s", str);
return false;
}
break;
}
case QTYPE_QNUM: {
int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
if (length > 0 && length <= UINT_MAX) {
block_acct_add_interval(stats, (unsigned) length);
} else {
error_setg(errp, "Invalid interval length: %" PRId64, length);
return false;
}
break;
}
default:
error_setg(errp, "The specification of stats-intervals is invalid");
return false;
}
}
return true;
}
typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
/* All parameters but @opts are optional and may be set to NULL. */
static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
const char **throttling_group, ThrottleConfig *throttle_cfg,
BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
{
Error *local_error = NULL;
const char *aio;
if (bdrv_flags) {
if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
*bdrv_flags |= BDRV_O_COPY_ON_READ;
}
if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
error_setg(errp, "invalid aio option");
return;
}
}
}
/* disk I/O throttling */
if (throttling_group) {
*throttling_group = qemu_opt_get(opts, "throttling.group");
}
if (throttle_cfg) {
throttle_config_init(throttle_cfg);
throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.bps-total", 0);
throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
qemu_opt_get_number(opts, "throttling.bps-read", 0);
throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.bps-write", 0);
throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.iops-total", 0);
throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
qemu_opt_get_number(opts, "throttling.iops-read", 0);
throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.iops-write", 0);
throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
throttle_cfg->buckets[THROTTLE_BPS_READ].max =
qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
throttle_cfg->buckets[THROTTLE_OPS_READ].max =
qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
throttle_cfg->op_size =
qemu_opt_get_number(opts, "throttling.iops-size", 0);
if (!throttle_is_valid(throttle_cfg, errp)) {
return;
}
}
if (detect_zeroes) {
*detect_zeroes =
qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
qemu_opt_get(opts, "detect-zeroes"),
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
&local_error);
if (local_error) {
error_propagate(errp, local_error);
return;
}
}
}
/* Takes the ownership of bs_opts */
static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
Error **errp)
{
const char *buf;
int bdrv_flags = 0;
int on_read_error, on_write_error;
bool account_invalid, account_failed;
bool writethrough, read_only;
BlockBackend *blk;
BlockDriverState *bs;
ThrottleConfig cfg;
int snapshot = 0;
Error *error = NULL;
QemuOpts *opts;
QDict *interval_dict = NULL;
QList *interval_list = NULL;
const char *id;
BlockdevDetectZeroesOptions detect_zeroes =
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
const char *throttling_group = NULL;
/* 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, errp);
if (!opts) {
goto err_no_opts;
}
if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
goto early_err;
}
if (id) {
qdict_del(bs_opts, "id");
}
/* extract parameters */
snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
id = qemu_opts_id(opts);
qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
qdict_array_split(interval_dict, &interval_list);
if (qdict_size(interval_dict) != 0) {
error_setg(errp, "Invalid option stats-intervals.%s",
qdict_first(interval_dict)->key);
goto early_err;
}
extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
&detect_zeroes, &error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
if ((buf = qemu_opt_get(opts, "format")) != NULL) {
if (is_help_option(buf)) {
qemu_printf("Supported formats:");
bdrv_iterate_format(bdrv_format_print, NULL, false);
qemu_printf("\nSupported formats (read-only):");
bdrv_iterate_format(bdrv_format_print, NULL, true);
qemu_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_str(bs_opts, "driver", buf);
}
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;
}
}
if (snapshot) {
bdrv_flags |= BDRV_O_SNAPSHOT;
}
read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
/* init */
if ((!file || !*file) && !qdict_size(bs_opts)) {
BlockBackendRootState *blk_rs;
blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
blk_rs = blk_get_root_state(blk);
blk_rs->open_flags = bdrv_flags;
blk_rs->read_only = read_only;
blk_rs->detect_zeroes = detect_zeroes;
qobject_unref(bs_opts);
} else {
if (file && !*file) {
file = NULL;
}
/* bdrv_open() defaults to the values in bdrv_flags (for compatibility
* with other callers) rather than what we want as the real defaults.
* Apply the defaults here instead. */
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
read_only ? "on" : "off");
qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
if (runstate_check(RUN_STATE_INMIGRATE)) {
bdrv_flags |= BDRV_O_INACTIVE;
}
blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
if (!blk) {
goto err_no_bs_opts;
}
bs = blk_bs(blk);
bs->detect_zeroes = detect_zeroes;
block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
blk_unref(blk);
blk = NULL;
goto err_no_bs_opts;
}
}
/* disk I/O throttling */
if (throttle_enabled(&cfg)) {
if (!throttling_group) {
throttling_group = id;
}
blk_io_limits_enable(blk, throttling_group);
blk_set_io_limits(blk, &cfg);
}
blk_set_enable_write_cache(blk, !writethrough);
blk_set_on_error(blk, on_read_error, on_write_error);
if (!monitor_add_blk(blk, id, errp)) {
blk_unref(blk);
blk = NULL;
goto err_no_bs_opts;
}
err_no_bs_opts:
qemu_opts_del(opts);
qobject_unref(interval_dict);
qobject_unref(interval_list);
return blk;
early_err:
qemu_opts_del(opts);
qobject_unref(interval_dict);
qobject_unref(interval_list);
err_no_opts:
qobject_unref(bs_opts);
return NULL;
}
/* Takes the ownership of bs_opts */
BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
{
int bdrv_flags = 0;
/* bdrv_open() defaults to the values in bdrv_flags (for compatibility
* with other callers) rather than what we want as the real defaults.
* Apply the defaults here instead. */
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
if (runstate_check(RUN_STATE_INMIGRATE)) {
bdrv_flags |= BDRV_O_INACTIVE;
}
return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
}
void blockdev_close_all_bdrv_states(void)
{
BlockDriverState *bs, *next_bs;
QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
}
}
/* Iterates over the list of monitor-owned BlockDriverStates */
BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
{
return bs ? QTAILQ_NEXT(bs, monitor_list)
: QTAILQ_FIRST(&monitor_bdrv_states);
}
static bool 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 false;
}
}
/* 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);
}
return true;
}
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 = "file",
.type = QEMU_OPT_STRING,
.help = "file name",
},
/* Options that are passed on, but have special semantics with -drive */
{
.name = BDRV_OPT_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,
Error **errp)
{
const char *value;
BlockBackend *blk;
DriveInfo *dinfo = NULL;
QDict *bs_opts;
QemuOpts *legacy_opts;
DriveMediaType media = MEDIA_DISK;
BlockInterfaceType type;
int max_devs, bus_id, unit_id, index;
const char *werror, *rerror;
bool read_only = false;
bool copy_on_read;
const char *filename;
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", BDRV_OPT_READ_ONLY },
};
for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
if (!qemu_opt_rename(all_opts, opt_renames[i].from,
opt_renames[i].to, errp)) {
return NULL;
}
}
value = qemu_opt_get(all_opts, "cache");
if (value) {
int flags = 0;
bool writethrough;
if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
error_setg(errp, "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,
!writethrough, &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);
if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
goto fail;
}
/* Media type */
value = qemu_opt_get(legacy_opts, "media");
if (value) {
if (!strcmp(value, "disk")) {
media = MEDIA_DISK;
} else if (!strcmp(value, "cdrom")) {
media = MEDIA_CDROM;
read_only = true;
} else {
error_setg(errp, "'%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, BDRV_OPT_READ_ONLY, false);
copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
if (read_only && copy_on_read) {
warn_report("disabling copy-on-read on read-only drive");
copy_on_read = false;
}
qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
/* 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_setg(errp, "unsupported bus type '%s'", value);
goto fail;
}
} else {
type = block_default_type;
}
/* 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_setg(errp, "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_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
goto fail;
}
if (drive_get(type, bus_id, unit_id) != NULL) {
error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
bus_id, unit_id, index);
goto fail;
}
/* no id supplied -> create one */
if (qemu_opts_id(all_opts) == NULL) {
char *new_id;
const char *mediastr = "";
if (type == IF_IDE || type == IF_SCSI) {
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
}
if (max_devs) {
new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
mediastr, unit_id);
} else {
new_id = g_strdup_printf("%s%s%i", if_name[type],
mediastr, unit_id);
}
qdict_put_str(bs_opts, "id", new_id);
g_free(new_id);
}
/* Add virtio block device */
if (type == IF_VIRTIO) {
QemuOpts *devopts;
devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
&error_abort);
qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
&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_setg(errp, "werror is not supported by this bus type");
goto fail;
}
qdict_put_str(bs_opts, "werror", 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_setg(errp, "rerror is not supported by this bus type");
goto fail;
}
qdict_put_str(bs_opts, "rerror", rerror);
}
/* Actual block device init: Functionality shared with blockdev-add */
blk = blockdev_init(filename, bs_opts, errp);
bs_opts = NULL;
if (!blk) {
goto fail;
}
/* Create legacy DriveInfo */
dinfo = g_malloc0(sizeof(*dinfo));
dinfo->opts = all_opts;
dinfo->type = type;
dinfo->bus = bus_id;
dinfo->unit = unit_id;
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);
qobject_unref(bs_opts);
return dinfo;
}
static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
{
BlockDriverState *bs;
bs = bdrv_lookup_bs(name, name, errp);
if (bs == NULL) {
return NULL;
}
if (!bdrv_is_root_node(bs)) {
error_setg(errp, "Need a root block node");
return NULL;
}
if (!bdrv_is_inserted(bs)) {
error_setg(errp, "Device has no medium");
return NULL;
}
return bs;
}
static void blockdev_do_action(TransactionAction *action, Error **errp)
{
TransactionActionList list;
list.value = action;
list.next = NULL;
qmp_transaction(&list, false, NULL, 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)
{
BlockdevSnapshotSync 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,
};
TransactionAction action = {
.type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
.u.blockdev_snapshot_sync.data = &snapshot,
};
blockdev_do_action(&action, errp);
}
void qmp_blockdev_snapshot(const char *node, const char *overlay,
Error **errp)
{
BlockdevSnapshot snapshot_data = {
.node = (char *) node,
.overlay = (char *) overlay
};
TransactionAction action = {
.type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
.u.blockdev_snapshot.data = &snapshot_data,
};
blockdev_do_action(&action, errp);
}
void qmp_blockdev_snapshot_internal_sync(const char *device,
const char *name,
Error **errp)
{
BlockdevSnapshotInternal snapshot = {
.device = (char *) device,
.name = (char *) name
};
TransactionAction action = {
.type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
.u.blockdev_snapshot_internal_sync.data = &snapshot,
};
blockdev_do_action(&action, 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;
AioContext *aio_context;
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
int ret;
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!has_id) {
id = NULL;
}
if (!has_name) {
name = NULL;
}
if (!id && !name) {
error_setg(errp, "Name or id must be provided");
goto out_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;
if (sn.icount != -1ULL) {
info->icount = sn.icount;
info->has_icount = true;
}
return info;
out_aio_context:
aio_context_release(aio_context);
return NULL;
}
/* New and old BlockDriverState structs for atomic group operations */
typedef struct BlkActionState BlkActionState;
/**
* BlkActionOps:
* Table of operations that define an Action.
*
* @instance_size: Size of state struct, in bytes.
* @prepare: Prepare the work, must NOT be NULL.
* @commit: Commit the changes, can be NULL.
* @abort: Abort the changes on fail, can be NULL.
* @clean: Clean up resources after all transaction actions have called
* commit() or abort(). Can be NULL.
*
* Only prepare() may fail. In a single transaction, only one of commit() or
* abort() will be called. clean() will always be called if it is present.
*/
typedef struct BlkActionOps {
size_t instance_size;
void (*prepare)(BlkActionState *common, Error **errp);
void (*commit)(BlkActionState *common);
void (*abort)(BlkActionState *common);
void (*clean)(BlkActionState *common);
} BlkActionOps;
/**
* BlkActionState:
* Describes one Action's state within a Transaction.
*
* @action: QAPI-defined enum identifying which Action to perform.
* @ops: Table of ActionOps this Action can perform.
* @block_job_txn: Transaction which this action belongs to.
* @entry: List membership for all Actions in this Transaction.
*
* This structure must be arranged as first member in a subclassed type,
* assuming that the compiler will also arrange it to the same offsets as the
* base class.
*/
struct BlkActionState {
TransactionAction *action;
const BlkActionOps *ops;
JobTxn *block_job_txn;
TransactionProperties *txn_props;
QTAILQ_ENTRY(BlkActionState) entry;
};
/* internal snapshot private data */
typedef struct InternalSnapshotState {
BlkActionState common;
BlockDriverState *bs;
QEMUSnapshotInfo sn;
bool created;
} InternalSnapshotState;
static int action_check_completion_mode(BlkActionState *s, Error **errp)
{
if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
error_setg(errp,
"Action '%s' does not support Transaction property "
"completion-mode = %s",
TransactionActionKind_str(s->action->type),
ActionCompletionMode_str(s->txn_props->completion_mode));
return -1;
}
return 0;
}
static void internal_snapshot_prepare(BlkActionState *common,
Error **errp)
{
Error *local_err = NULL;
const char *device;
const char *name;
BlockDriverState *bs;
QEMUSnapshotInfo old_sn, *sn;
bool ret;
qemu_timeval tv;
BlockdevSnapshotInternal *internal;
InternalSnapshotState *state;
AioContext *aio_context;
int ret1;
g_assert(common->action->type ==
TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
internal = common->action->u.blockdev_snapshot_internal_sync.data;
state = DO_UPCAST(InternalSnapshotState, common, common);
/* 1. parse input */
device = internal->device;
name = internal->name;
/* 2. check for validation */
if (action_check_completion_mode(common, errp) < 0) {
return;
}
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
state->bs = bs;
/* Paired with .clean() */
bdrv_drained_begin(bs);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
goto out;
}
if (bdrv_is_read_only(bs)) {
error_setg(errp, "Device '%s' is read only", device);
goto out;
}
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);
goto out;
}
if (!strlen(name)) {
error_setg(errp, "Name is empty");
goto out;
}
/* 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);
goto out;
} else if (ret) {
error_setg(errp,
"Snapshot with name '%s' already exists on device '%s'",
name, device);
goto out;
}
/* 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);
if (replay_mode != REPLAY_MODE_NONE) {
sn->icount = replay_get_current_icount();
} else {
sn->icount = -1ULL;
}
ret1 = bdrv_snapshot_create(bs, sn);
if (ret1 < 0) {
error_setg_errno(errp, -ret1,
"Failed to create snapshot '%s' on device '%s'",
name, device);
goto out;
}
/* 4. succeed, mark a snapshot is created */
state->created = true;
out:
aio_context_release(aio_context);
}
static void internal_snapshot_abort(BlkActionState *common)
{
InternalSnapshotState *state =
DO_UPCAST(InternalSnapshotState, common, common);
BlockDriverState *bs = state->bs;
QEMUSnapshotInfo *sn = &state->sn;
AioContext *aio_context;
Error *local_error = NULL;
if (!state->created) {
return;
}
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
error_reportf_err(local_error,
"Failed to delete snapshot with id '%s' and "
"name '%s' on device '%s' in abort: ",
sn->id_str, sn->name,
bdrv_get_device_name(bs));
}
aio_context_release(aio_context);
}
static void internal_snapshot_clean(BlkActionState *common)
{
InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
common, common);
AioContext *aio_context;
if (!state->bs) {
return;
}
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
bdrv_drained_end(state->bs);
aio_context_release(aio_context);
}
/* external snapshot private data */
typedef struct ExternalSnapshotState {
BlkActionState common;
BlockDriverState *old_bs;
BlockDriverState *new_bs;
bool overlay_appended;
} ExternalSnapshotState;
static void external_snapshot_prepare(BlkActionState *common,
Error **errp)
{
int ret;
int flags = 0;
QDict *options = NULL;
Error *local_err = NULL;
/* Device and node name of the image to generate the snapshot from */
const char *device;
const char *node_name;
/* Reference to the new image (for 'blockdev-snapshot') */
const char *snapshot_ref;
/* File name of the new image (for 'blockdev-snapshot-sync') */
const char *new_image_file;
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
TransactionAction *action = common->action;
AioContext *aio_context;
uint64_t perm, shared;
/* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
* purpose but a different set of parameters */
switch (action->type) {
case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
{
BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
device = s->node;
node_name = s->node;
new_image_file = NULL;
snapshot_ref = s->overlay;
}
break;
case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
{
BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
device = s->has_device ? s->device : NULL;
node_name = s->has_node_name ? s->node_name : NULL;
new_image_file = s->snapshot_file;
snapshot_ref = NULL;
}
break;
default:
g_assert_not_reached();
}
/* start processing */
if (action_check_completion_mode(common, errp) < 0) {
return;
}
state->old_bs = bdrv_lookup_bs(device, node_name, errp);
if (!state->old_bs) {
return;
}
aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(aio_context);
/* Paired with .clean() */
bdrv_drained_begin(state->old_bs);
if (!bdrv_is_inserted(state->old_bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
goto out;
}
if (bdrv_op_is_blocked(state->old_bs,
BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
goto out;
}
if (!bdrv_is_read_only(state->old_bs)) {
if (bdrv_flush(state->old_bs)) {
error_setg(errp, QERR_IO_ERROR);
goto out;
}
}
if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
const char *format = s->has_format ? s->format : "qcow2";
enum NewImageMode mode;
const char *snapshot_node_name =
s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
if (node_name && !snapshot_node_name) {
error_setg(errp, "New overlay node-name missing");
goto out;
}
if (snapshot_node_name &&
bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
error_setg(errp, "New overlay node-name already in use");
goto out;
}
flags = state->old_bs->open_flags;
flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
flags |= BDRV_O_NO_BACKING;
/* create new image w/backing file */
mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
if (mode != NEW_IMAGE_MODE_EXISTING) {
int64_t size = bdrv_getlength(state->old_bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
goto out;
}
bdrv_refresh_filename(state->old_bs);
bdrv_img_create(new_image_file, format,
state->old_bs->filename,
state->old_bs->drv->format_name,
NULL, size, flags, false, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
}
options = qdict_new();
if (snapshot_node_name) {
qdict_put_str(options, "node-name", snapshot_node_name);
}
qdict_put_str(options, "driver", format);
}
state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
errp);
/* We will manually add the backing_hd field to the bs later */
if (!state->new_bs) {
goto out;
}
/*
* Allow attaching a backing file to an overlay that's already in use only
* if the parents don't assume that they are already seeing a valid image.
* (Specifically, allow it as a mirror target, which is write-only access.)
*/
bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
if (perm & BLK_PERM_CONSISTENT_READ) {
error_setg(errp, "The overlay is already in use");
goto out;
}
if (state->new_bs->drv->is_filter) {
error_setg(errp, "Filters cannot be used as overlays");
goto out;
}
if (bdrv_cow_child(state->new_bs)) {
error_setg(errp, "The overlay already has a backing image");
goto out;
}
if (!state->new_bs->drv->supports_backing) {
error_setg(errp, "The overlay does not support backing images");
goto out;
}
ret = bdrv_append(state->new_bs, state->old_bs, errp);
if (ret < 0) {
goto out;
}
state->overlay_appended = true;
out:
aio_context_release(aio_context);
}
static void external_snapshot_commit(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
AioContext *aio_context;
aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(aio_context);
/* 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 */
if (!qatomic_read(&state->old_bs->copy_on_read)) {
bdrv_reopen_set_read_only(state->old_bs, true, NULL);
}
aio_context_release(aio_context);
}
static void external_snapshot_abort(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
if (state->new_bs) {
if (state->overlay_appended) {
AioContext *aio_context;
AioContext *tmp_context;
int ret;
aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(aio_context);
bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
close state->old_bs; we need it */
bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
/*
* The call to bdrv_set_backing_hd() above returns state->old_bs to
* the main AioContext. As we're still going to be using it, return
* it to the AioContext it was before.
*/
tmp_context = bdrv_get_aio_context(state->old_bs);
if (aio_context != tmp_context) {
aio_context_release(aio_context);
aio_context_acquire(tmp_context);
ret = bdrv_try_set_aio_context(state->old_bs,
aio_context, NULL);
assert(ret == 0);
aio_context_release(tmp_context);
aio_context_acquire(aio_context);
}
bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
aio_context_release(aio_context);
}
}
}
static void external_snapshot_clean(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
AioContext *aio_context;
if (!state->old_bs) {
return;
}
aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(aio_context);
bdrv_drained_end(state->old_bs);
bdrv_unref(state->new_bs);
aio_context_release(aio_context);
}
typedef struct DriveBackupState {
BlkActionState common;
BlockDriverState *bs;
BlockJob *job;
} DriveBackupState;
static BlockJob *do_backup_common(BackupCommon *backup,
BlockDriverState *bs,
BlockDriverState *target_bs,
AioContext *aio_context,
JobTxn *txn, Error **errp);
static void drive_backup_prepare(BlkActionState *common, Error **errp)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
DriveBackup *backup;
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
AioContext *aio_context;
AioContext *old_context;
QDict *options;
Error *local_err = NULL;
int flags;
int64_t size;
bool set_backing_hd = false;
int ret;
assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
backup = common->action->u.drive_backup.data;
if (!backup->has_mode) {
backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
bs = bdrv_lookup_bs(backup->device, backup->device, errp);
if (!bs) {
return;
}
if (!bs->drv) {
error_setg(errp, "Device has no medium");
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
/* Paired with .clean() */
bdrv_drained_begin(bs);
if (!backup->has_format) {
backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
NULL : (char *) bs->drv->format_name;
}
/* 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 (backup->sync == MIRROR_SYNC_MODE_TOP) {
/*
* Backup will not replace the source by the target, so none
* of the filters skipped here will be removed (in contrast to
* mirror). Therefore, we can skip all of them when looking
* for the first COW relationship.
*/
source = bdrv_cow_bs(bdrv_skip_filters(bs));
if (!source) {
backup->sync = MIRROR_SYNC_MODE_FULL;
}
}
if (backup->sync == MIRROR_SYNC_MODE_NONE) {
source = bs;
flags |= BDRV_O_NO_BACKING;
set_backing_hd = true;
}
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
goto out;
}
if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
assert(backup->format);
if (source) {
/* Implicit filters should not appear in the filename */
BlockDriverState *explicit_backing =
bdrv_skip_implicit_filters(source);
bdrv_refresh_filename(explicit_backing);
bdrv_img_create(backup->target, backup->format,
explicit_backing->filename,
explicit_backing->drv->format_name, NULL,
size, flags, false, &local_err);
} else {
bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
size, flags, false, &local_err);
}
}
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
options = qdict_new();
qdict_put_str(options, "discard", "unmap");
qdict_put_str(options, "detect-zeroes", "unmap");
if (backup->format) {
qdict_put_str(options, "driver", backup->format);
}
target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
if (!target_bs) {
goto out;
}
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_release(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
bdrv_unref(target_bs);
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (set_backing_hd) {
if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
goto unref;
}
}
state->bs = bs;
state->job = do_backup_common(qapi_DriveBackup_base(backup),
bs, target_bs, aio_context,
common->block_job_txn, errp);
unref:
bdrv_unref(target_bs);
out:
aio_context_release(aio_context);
}
static void drive_backup_commit(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
AioContext *aio_context;
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
assert(state->job);
job_start(&state->job->job);
aio_context_release(aio_context);
}
static void drive_backup_abort(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
if (state->job) {
AioContext *aio_context;
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
job_cancel_sync(&state->job->job);
aio_context_release(aio_context);
}
}
static void drive_backup_clean(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
AioContext *aio_context;
if (!state->bs) {
return;
}
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
bdrv_drained_end(state->bs);
aio_context_release(aio_context);
}
typedef struct BlockdevBackupState {
BlkActionState common;
BlockDriverState *bs;
BlockJob *job;
} BlockdevBackupState;
static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
BlockdevBackup *backup;
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
AioContext *old_context;
int ret;
assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
backup = common->action->u.blockdev_backup.data;
bs = bdrv_lookup_bs(backup->device, backup->device, errp);
if (!bs) {
return;
}
target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
if (!target_bs) {
return;
}
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
aio_context = bdrv_get_aio_context(bs);
old_context = bdrv_get_aio_context(target_bs);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
state->bs = bs;
/* Paired with .clean() */
bdrv_drained_begin(state->bs);
state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
bs, target_bs, aio_context,
common->block_job_txn, errp);
aio_context_release(aio_context);
}
static void blockdev_backup_commit(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
AioContext *aio_context;
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
assert(state->job);
job_start(&state->job->job);
aio_context_release(aio_context);
}
static void blockdev_backup_abort(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
if (state->job) {
AioContext *aio_context;
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
job_cancel_sync(&state->job->job);
aio_context_release(aio_context);
}
}
static void blockdev_backup_clean(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
AioContext *aio_context;
if (!state->bs) {
return;
}
aio_context = bdrv_get_aio_context(state->bs);
aio_context_acquire(aio_context);
bdrv_drained_end(state->bs);
aio_context_release(aio_context);
}
typedef struct BlockDirtyBitmapState {
BlkActionState common;
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
HBitmap *backup;
bool prepared;
bool was_enabled;
} BlockDirtyBitmapState;
static void block_dirty_bitmap_add_prepare(BlkActionState *common,
Error **errp)
{
Error *local_err = NULL;
BlockDirtyBitmapAdd *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_add.data;
/* AIO context taken and released within qmp_block_dirty_bitmap_add */
qmp_block_dirty_bitmap_add(action->node, action->name,
action->has_granularity, action->granularity,
action->has_persistent, action->persistent,
action->has_disabled, action->disabled,
&local_err);
if (!local_err) {
state->prepared = true;
} else {
error_propagate(errp, local_err);
}
}
static void block_dirty_bitmap_add_abort(BlkActionState *common)
{
BlockDirtyBitmapAdd *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
action = common->action->u.block_dirty_bitmap_add.data;
/* Should not be able to fail: IF the bitmap was added via .prepare(),
* then the node reference and bitmap name must have been valid.
*/
if (state->prepared) {
qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
}
}
static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
BlockDirtyBitmap *action;
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_clear.data;
state->bitmap = block_dirty_bitmap_lookup(action->node,
action->name,
&state->bs,
errp);
if (!state->bitmap) {
return;
}
if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
return;
}
bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
}
static void block_dirty_bitmap_restore(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (state->backup) {
bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
}
}
static void block_dirty_bitmap_free_backup(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
hbitmap_free(state->backup);
}
static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmap *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_enable.data;
state->bitmap = block_dirty_bitmap_lookup(action->node,
action->name,
NULL,
errp);
if (!state->bitmap) {
return;
}
if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
return;
}
state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
bdrv_enable_dirty_bitmap(state->bitmap);
}
static void block_dirty_bitmap_enable_abort(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (!state->was_enabled) {
bdrv_disable_dirty_bitmap(state->bitmap);
}
}
static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmap *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_disable.data;
state->bitmap = block_dirty_bitmap_lookup(action->node,
action->name,
NULL,
errp);
if (!state->bitmap) {
return;
}
if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
return;
}
state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
bdrv_disable_dirty_bitmap(state->bitmap);
}
static void block_dirty_bitmap_disable_abort(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (state->was_enabled) {
bdrv_enable_dirty_bitmap(state->bitmap);
}
}
static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmapMerge *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_merge.data;
state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
action->bitmaps, &state->backup,
errp);
}
static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmap *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.block_dirty_bitmap_remove.data;
state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
false, &state->bs, errp);
if (state->bitmap) {
bdrv_dirty_bitmap_skip_store(state->bitmap, true);
bdrv_dirty_bitmap_set_busy(state->bitmap, true);
}
}
static void block_dirty_bitmap_remove_abort(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (state->bitmap) {
bdrv_dirty_bitmap_skip_store(state->bitmap, false);
bdrv_dirty_bitmap_set_busy(state->bitmap, false);
}
}
static void block_dirty_bitmap_remove_commit(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
bdrv_dirty_bitmap_set_busy(state->bitmap, false);
bdrv_release_dirty_bitmap(state->bitmap);
}
static void abort_prepare(BlkActionState *common, Error **errp)
{
error_setg(errp, "Transaction aborted using Abort action");
}
static void abort_commit(BlkActionState *common)
{
g_assert_not_reached(); /* this action never succeeds */
}
static const BlkActionOps actions[] = {
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
.instance_size = sizeof(ExternalSnapshotState),
.prepare = external_snapshot_prepare,
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
.clean = external_snapshot_clean,
},
[TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
.instance_size = sizeof(ExternalSnapshotState),
.prepare = external_snapshot_prepare,
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
.clean = external_snapshot_clean,
},
[TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
.instance_size = sizeof(DriveBackupState),
.prepare = drive_backup_prepare,
.commit = drive_backup_commit,
.abort = drive_backup_abort,
.clean = drive_backup_clean,
},
[TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
.instance_size = sizeof(BlockdevBackupState),
.prepare = blockdev_backup_prepare,
.commit = blockdev_backup_commit,
.abort = blockdev_backup_abort,
.clean = blockdev_backup_clean,
},
[TRANSACTION_ACTION_KIND_ABORT] = {
.instance_size = sizeof(BlkActionState),
.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,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_add_prepare,
.abort = block_dirty_bitmap_add_abort,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_clear_prepare,
.commit = block_dirty_bitmap_free_backup,
.abort = block_dirty_bitmap_restore,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_enable_prepare,
.abort = block_dirty_bitmap_enable_abort,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_disable_prepare,
.abort = block_dirty_bitmap_disable_abort,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_merge_prepare,
.commit = block_dirty_bitmap_free_backup,
.abort = block_dirty_bitmap_restore,
},
[TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_remove_prepare,
.commit = block_dirty_bitmap_remove_commit,
.abort = block_dirty_bitmap_remove_abort,
},
/* Where are transactions for MIRROR, COMMIT and STREAM?
* Although these blockjobs use transaction callbacks like the backup job,
* these jobs do not necessarily adhere to transaction semantics.
* These jobs may not fully undo all of their actions on abort, nor do they
* necessarily work in transactions with more than one job in them.
*/
};
/**
* Allocate a TransactionProperties structure if necessary, and fill
* that structure with desired defaults if they are unset.
*/
static TransactionProperties *get_transaction_properties(
TransactionProperties *props)
{
if (!props) {
props = g_new0(TransactionProperties, 1);
}
if (!props->has_completion_mode) {
props->has_completion_mode = true;
props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
}
return props;
}
/*
* '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,
bool has_props,
struct TransactionProperties *props,
Error **errp)
{
TransactionActionList *dev_entry = dev_list;
JobTxn *block_job_txn = NULL;
BlkActionState *state, *next;
Error *local_err = NULL;
QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
QTAILQ_INIT(&snap_bdrv_states);
/* Does this transaction get canceled as a group on failure?
* If not, we don't really need to make a JobTxn.
*/
props = get_transaction_properties(props);
if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
block_job_txn = job_txn_new();
}
/* 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 BlkActionOps *ops;
dev_info = dev_entry->value;
dev_entry = dev_entry->next;
assert(dev_info->type < ARRAY_SIZE(actions));
ops = &actions[dev_info->type];
assert(ops->instance_size > 0);
state = g_malloc0(ops->instance_size);
state->ops = ops;
state->action = dev_info;
state->block_job_txn = block_job_txn;
state->txn_props = props;
QTAILQ_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;
}
}
QTAILQ_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 */
QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
if (state->ops->abort) {
state->ops->abort(state);
}
}
exit:
QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
if (state->ops->clean) {
state->ops->clean(state);
}
g_free(state);
}
if (!has_props) {
qapi_free_TransactionProperties(props);
}
job_txn_unref(block_job_txn);
}
BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
const char *name,
Error **errp)
{
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
BlockDirtyBitmapSha256 *ret = NULL;
char *sha256;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
return NULL;
}
sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
if (sha256 == NULL) {
return NULL;
}
ret = g_new(BlockDirtyBitmapSha256, 1);
ret->sha256 = sha256;
return ret;
}
void coroutine_fn 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;
BlockBackend *blk;
BlockDriverState *bs;
AioContext *old_ctx;
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 (size < 0) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
error_setg(errp, QERR_DEVICE_IN_USE, device);
return;
}
blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
if (!blk) {
return;
}
bdrv_co_lock(bs);
bdrv_drained_begin(bs);
bdrv_co_unlock(bs);
old_ctx = bdrv_co_enter(bs);
blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
bdrv_co_leave(bs, old_ctx);
bdrv_co_lock(bs);
bdrv_drained_end(bs);
blk_unref(blk);
bdrv_co_unlock(bs);
}
void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
bool has_base, const char *base,
bool has_base_node, const char *base_node,
bool has_backing_file, const char *backing_file,
bool has_bottom, const char *bottom,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
bool has_filter_node_name, const char *filter_node_name,
bool has_auto_finalize, bool auto_finalize,
bool has_auto_dismiss, bool auto_dismiss,
Error **errp)
{
BlockDriverState *bs, *iter, *iter_end;
BlockDriverState *base_bs = NULL;
BlockDriverState *bottom_bs = NULL;
AioContext *aio_context;
Error *local_err = NULL;
int job_flags = JOB_DEFAULT;
if (has_base && has_base_node) {
error_setg(errp, "'base' and 'base-node' cannot be specified "
"at the same time");
return;
}
if (has_base && has_bottom) {
error_setg(errp, "'base' and 'bottom' cannot be specified "
"at the same time");
return;
}
if (has_bottom && has_base_node) {
error_setg(errp, "'bottom' and 'base-node' cannot be specified "
"at the same time");
return;
}
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
bs = bdrv_lookup_bs(device, device, errp);
if (!bs) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (has_base) {
base_bs = bdrv_find_backing_image(bs, base);
if (base_bs == NULL) {
error_setg(errp, "Can't find '%s' in the backing chain", base);
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
}
if (has_base_node) {
base_bs = bdrv_lookup_bs(NULL, base_node, errp);
if (!base_bs) {
goto out;
}
if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
error_setg(errp, "Node '%s' is not a backing image of '%s'",
base_node, device);
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
bdrv_refresh_filename(base_bs);
}
if (has_bottom) {
bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
if (!bottom_bs) {
goto out;
}
if (!bottom_bs->drv) {
error_setg(errp, "Node '%s' is not open", bottom);
goto out;
}
if (bottom_bs->drv->is_filter) {
error_setg(errp, "Node '%s' is a filter, use a non-filter node "
"as 'bottom'", bottom);
goto out;
}
if (!bdrv_chain_contains(bs, bottom_bs)) {
error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
bottom, device);
goto out;
}
assert(bdrv_get_aio_context(bottom_bs) == aio_context);
}
/*
* Check for op blockers in the whole chain between bs and base (or bottom)
*/
iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
for (iter = bs; iter && iter != iter_end;
iter = bdrv_filter_or_cow_bs(iter))
{
if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
goto out;
}
}
/* 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;
}
if (has_auto_finalize && !auto_finalize) {
job_flags |= JOB_MANUAL_FINALIZE;
}
if (has_auto_dismiss && !auto_dismiss) {
job_flags |= JOB_MANUAL_DISMISS;
}
stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file,
bottom_bs, job_flags, has_speed ? speed : 0, on_error,
filter_node_name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
trace_qmp_block_stream(bs);
out:
aio_context_release(aio_context);
}
void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
bool has_base_node, const char *base_node,
bool has_base, const char *base,
bool has_top_node, const char *top_node,
bool has_top, const char *top,
bool has_backing_file, const char *backing_file,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
bool has_filter_node_name, const char *filter_node_name,
bool has_auto_finalize, bool auto_finalize,
bool has_auto_dismiss, bool auto_dismiss,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *iter;
BlockDriverState *base_bs, *top_bs;
AioContext *aio_context;
Error *local_err = NULL;
int job_flags = JOB_DEFAULT;
uint64_t top_perm, top_shared;
if (!has_speed) {
speed = 0;
}
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_filter_node_name) {
filter_node_name = NULL;
}
if (has_auto_finalize && !auto_finalize) {
job_flags |= JOB_MANUAL_FINALIZE;
}
if (has_auto_dismiss && !auto_dismiss) {
job_flags |= JOB_MANUAL_DISMISS;
}
/* 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. */
bs = qmp_get_root_bs(device, &local_err);
if (!bs) {
bs = bdrv_lookup_bs(device, device, NULL);
if (!bs) {
error_free(local_err);
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
} else {
error_propagate(errp, local_err);
}
return;
}
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_node && has_top) {
error_setg(errp, "'top-node' and 'top' are mutually exclusive");
goto out;
} else if (has_top_node) {
top_bs = bdrv_lookup_bs(NULL, top_node, errp);
if (top_bs == NULL) {
goto out;
}
if (!bdrv_chain_contains(bs, top_bs)) {
error_setg(errp, "'%s' is not in this backing file chain",
top_node);
goto out;
}
} else if (has_top && top) {
/* This strcmp() is just a shortcut, there is no need to
* refresh @bs's filename. If it mismatches,
* bdrv_find_backing_image() will do the refresh and may still
* return @bs. */
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_node && has_base) {
error_setg(errp, "'base-node' and 'base' are mutually exclusive");
goto out;
} else if (has_base_node) {
base_bs = bdrv_lookup_bs(NULL, base_node, errp);
if (base_bs == NULL) {
goto out;
}
if (!bdrv_chain_contains(top_bs, base_bs)) {
error_setg(errp, "'%s' is not in this backing file chain",
base_node);
goto out;
}
} else if (has_base && base) {
base_bs = bdrv_find_backing_image(top_bs, base);
if (base_bs == NULL) {
error_setg(errp, "Can't find '%s' in the backing chain", base);
goto out;
}
} else {
base_bs = bdrv_find_base(top_bs);
if (base_bs == NULL) {
error_setg(errp, "There is no backimg image");
goto out;
}
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
iter = bdrv_filter_or_cow_bs(iter))
{
if (bdrv_op_is_blocked(iter, 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;
}
/*
* Active commit is required if and only if someone has taken a
* WRITE permission on the top node. Historically, we have always
* used active commit for top nodes, so continue that practice
* lest we possibly break clients that rely on this behavior, e.g.
* to later attach this node to a writing parent.
* (Active commit is never really wrong.)
*/
bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
if (top_perm & BLK_PERM_WRITE ||
bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
{
if (has_backing_file) {
if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
error_setg(errp, "'backing-file' specified,"
" but 'top' is the active layer");
} else {
error_setg(errp, "'backing-file' specified, but 'top' has a "
"writer on it");
}
goto out;
}
if (!has_job_id) {
/*
* Emulate here what block_job_create() does, because it
* is possible that @bs != @top_bs (the block job should
* be named after @bs, even if @top_bs is the actual
* source)
*/
job_id = bdrv_get_device_name(bs);
}
commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
filter_node_name, NULL, NULL, false, &local_err);
} else {
BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
goto out;
}
commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
speed, on_error, has_backing_file ? backing_file : NULL,
filter_node_name, &local_err);
}
if (local_err != NULL) {
error_propagate(errp, local_err);
goto out;
}
out:
aio_context_release(aio_context);
}
/* Common QMP interface for drive-backup and blockdev-backup */
static BlockJob *do_backup_common(BackupCommon *backup,
BlockDriverState *bs,
BlockDriverState *target_bs,
AioContext *aio_context,
JobTxn *txn, Error **errp)
{
BlockJob *job = NULL;
BdrvDirtyBitmap *bmap = NULL;
BackupPerf perf = { .max_workers = 64 };
int job_flags = JOB_DEFAULT;
if (!backup->has_speed) {
backup->speed = 0;
}
if (!backup->has_on_source_error) {
backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!backup->has_on_target_error) {
backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!backup->has_job_id) {
backup->job_id = NULL;
}
if (!backup->has_auto_finalize) {
backup->auto_finalize = true;
}
if (!backup->has_auto_dismiss) {
backup->auto_dismiss = true;
}
if (!backup->has_compress) {
backup->compress = false;
}
if (backup->x_perf) {
if (backup->x_perf->has_use_copy_range) {
perf.use_copy_range = backup->x_perf->use_copy_range;
}
if (backup->x_perf->has_max_workers) {
perf.max_workers = backup->x_perf->max_workers;
}
if (backup->x_perf->has_max_chunk) {
perf.max_chunk = backup->x_perf->max_chunk;
}
}
if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
(backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
/* done before desugaring 'incremental' to print the right message */
if (!backup->has_bitmap) {
error_setg(errp, "must provide a valid bitmap name for "
"'%s' sync mode", MirrorSyncMode_str(backup->sync));
return NULL;
}
}
if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
if (backup->has_bitmap_mode &&
backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
error_setg(errp, "Bitmap sync mode must be '%s' "
"when using sync mode '%s'",
BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
MirrorSyncMode_str(backup->sync));
return NULL;
}
backup->has_bitmap_mode = true;
backup->sync = MIRROR_SYNC_MODE_BITMAP;
backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
}
if (backup->has_bitmap) {
bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
if (!bmap) {
error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
return NULL;
}
if (!backup->has_bitmap_mode) {
error_setg(errp, "Bitmap sync mode must be given "
"when providing a bitmap");
return NULL;
}
if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
return NULL;
}
/* This does not produce a useful bitmap artifact: */
if (backup->sync == MIRROR_SYNC_MODE_NONE) {
error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
" outputs", MirrorSyncMode_str(backup->sync));
return NULL;
}
/* If the bitmap isn't used for input or output, this is useless: */
if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
backup->sync != MIRROR_SYNC_MODE_BITMAP) {
error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
" when combined with sync mode '%s'",
BitmapSyncMode_str(backup->bitmap_mode),
MirrorSyncMode_str(backup->sync));
return NULL;
}
}
if (!backup->has_bitmap && backup->has_bitmap_mode) {
error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
return NULL;
}
if (!backup->auto_finalize) {
job_flags |= JOB_MANUAL_FINALIZE;
}
if (!backup->auto_dismiss) {
job_flags |= JOB_MANUAL_DISMISS;
}
job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
backup->sync, bmap, backup->bitmap_mode,
backup->compress,
backup->filter_node_name,
&perf,
backup->on_source_error,
backup->on_target_error,
job_flags, NULL, NULL, txn, errp);
return job;
}
void qmp_drive_backup(DriveBackup *backup, Error **errp)
{
TransactionAction action = {
.type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
.u.drive_backup.data = backup,
};
blockdev_do_action(&action, errp);
}
BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
bool flat,
Error **errp)
{
bool return_flat = has_flat && flat;
return bdrv_named_nodes_list(return_flat, errp);
}
XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
{
return bdrv_get_xdbg_block_graph(errp);
}
void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
{
TransactionAction action = {
.type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
.u.blockdev_backup.data = backup,
};
blockdev_do_action(&action, errp);
}
/* Parameter check and block job starting for drive mirroring.
* Caller should hold @device and @target's aio context (must be the same).
**/
static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
BlockDriverState *target,
bool has_replaces, const char *replaces,
enum MirrorSyncMode sync,
BlockMirrorBackingMode backing_mode,
bool zero_target,
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,
bool has_filter_node_name,
const char *filter_node_name,
bool has_copy_mode, MirrorCopyMode copy_mode,
bool has_auto_finalize, bool auto_finalize,
bool has_auto_dismiss, bool auto_dismiss,
Error **errp)
{
BlockDriverState *unfiltered_bs;
int job_flags = JOB_DEFAULT;
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_granularity) {
granularity = 0;
}
if (!has_buf_size) {
buf_size = 0;
}
if (!has_unmap) {
unmap = true;
}
if (!has_filter_node_name) {
filter_node_name = NULL;
}
if (!has_copy_mode) {
copy_mode = MIRROR_COPY_MODE_BACKGROUND;
}
if (has_auto_finalize && !auto_finalize) {
job_flags |= JOB_MANUAL_FINALIZE;
}
if (has_auto_dismiss && !auto_dismiss) {
job_flags |= JOB_MANUAL_DISMISS;
}
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",
"a power of 2");
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
return;
}
if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
return;
}
if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
if (!has_replaces) {
/* We want to mirror from @bs, but keep implicit filters on top */
unfiltered_bs = bdrv_skip_implicit_filters(bs);
if (unfiltered_bs != bs) {
replaces = unfiltered_bs->node_name;
has_replaces = true;
}
}
if (has_replaces) {
BlockDriverState *to_replace_bs;
AioContext *replace_aio_context;
int64_t bs_size, replace_size;
bs_size = bdrv_getlength(bs);
if (bs_size < 0) {
error_setg_errno(errp, -bs_size, "Failed to query device's size");
return;
}
to_replace_bs = check_to_replace_node(bs, replaces, errp);
if (!to_replace_bs) {
return;
}
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 (replace_size < 0) {
error_setg_errno(errp, -replace_size,
"Failed to query the replacement node's size");
return;
}
if (bs_size != replace_size) {
error_setg(errp, "cannot replace image with a mirror image of "
"different size");
return;
}
}
/* 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(job_id, bs, target,
has_replaces ? replaces : NULL, job_flags,
speed, granularity, buf_size, sync, backing_mode, zero_target,
on_source_error, on_target_error, unmap, filter_node_name,
copy_mode, errp);
}
void qmp_drive_mirror(DriveMirror *arg, Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_backing_bs, *target_bs;
AioContext *aio_context;
AioContext *old_context;
BlockMirrorBackingMode backing_mode;
Error *local_err = NULL;
QDict *options = NULL;
int flags;
int64_t size;
const char *format = arg->format;
bool zero_target;
int ret;
bs = qmp_get_root_bs(arg->device, errp);
if (!bs) {
return;
}
/* Early check to avoid creating target */
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!arg->has_mode) {
arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
if (!arg->has_format) {
format = (arg->mode == NEW_IMAGE_MODE_EXISTING
? NULL : bs->drv->format_name);
}
flags = bs->open_flags | BDRV_O_RDWR;
target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
arg->sync = MIRROR_SYNC_MODE_FULL;
}
if (arg->sync == MIRROR_SYNC_MODE_NONE) {
target_backing_bs = bs;
}
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
goto out;
}
if (arg->has_replaces) {
if (!arg->has_node_name) {
error_setg(errp, "a node-name must be provided when replacing a"
" named node of the graph");
goto out;
}
}
if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
} else {
backing_mode = MIRROR_OPEN_BACKING_CHAIN;
}
/* Don't open backing image in create() */
flags |= BDRV_O_NO_BACKING;
if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
&& arg->mode != NEW_IMAGE_MODE_EXISTING)
{
/* create new image w/o backing file */
assert(format);
bdrv_img_create(arg->target, format,
NULL, NULL, NULL, size, flags, false, &local_err);
} else {
/* Implicit filters should not appear in the filename */
BlockDriverState *explicit_backing =
bdrv_skip_implicit_filters(target_backing_bs);
switch (arg->mode) {
case NEW_IMAGE_MODE_EXISTING:
break;
case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
/* create new image with backing file */
bdrv_refresh_filename(explicit_backing);
bdrv_img_create(arg->target, format,
explicit_backing->filename,
explicit_backing->drv->format_name,
NULL, size, flags, false, &local_err);
break;
default:
abort();
}
}
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
options = qdict_new();
if (arg->has_node_name) {
qdict_put_str(options, "node-name", arg->node_name);
}
if (format) {
qdict_put_str(options, "driver", format);
}
/* Mirroring takes care of copy-on-write using the source's backing
* file.
*/
target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
if (!target_bs) {
goto out;
}
zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
(arg->mode == NEW_IMAGE_MODE_EXISTING ||
!bdrv_has_zero_init(target_bs)));
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_release(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
bdrv_unref(target_bs);
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
arg->has_replaces, arg->replaces, arg->sync,
backing_mode, zero_target,
arg->has_speed, arg->speed,
arg->has_granularity, arg->granularity,
arg->has_buf_size, arg->buf_size,
arg->has_on_source_error, arg->on_source_error,
arg->has_on_target_error, arg->on_target_error,
arg->has_unmap, arg->unmap,
false, NULL,
arg->has_copy_mode, arg->copy_mode,
arg->has_auto_finalize, arg->auto_finalize,
arg->has_auto_dismiss, arg->auto_dismiss,
errp);
bdrv_unref(target_bs);
out:
aio_context_release(aio_context);
}
void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
const char *device, const char *target,
bool has_replaces, const char *replaces,
MirrorSyncMode sync,
bool has_speed, int64_t speed,
bool has_granularity, uint32_t granularity,
bool has_buf_size, int64_t buf_size,
bool has_on_source_error,
BlockdevOnError on_source_error,
bool has_on_target_error,
BlockdevOnError on_target_error,
bool has_filter_node_name,
const char *filter_node_name,
bool has_copy_mode, MirrorCopyMode copy_mode,
bool has_auto_finalize, bool auto_finalize,
bool has_auto_dismiss, bool auto_dismiss,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
AioContext *old_context;
BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
bool zero_target;
int ret;
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return;
}
target_bs = bdrv_lookup_bs(target, target, errp);
if (!target_bs) {
return;
}
zero_target = (sync == MIRROR_SYNC_MODE_FULL);
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (ret < 0) {
goto out;
}
blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
has_replaces, replaces, sync, backing_mode,
zero_target, has_speed, speed,
has_granularity, granularity,
has_buf_size, buf_size,
has_on_source_error, on_source_error,
has_on_target_error, on_target_error,
true, true,
has_filter_node_name, filter_node_name,
has_copy_mode, copy_mode,
has_auto_finalize, auto_finalize,
has_auto_dismiss, auto_dismiss,
errp);
out:
aio_context_release(aio_context);
}
/* Get a block job using its ID and acquire its AioContext */
static BlockJob *find_block_job(const char *id, AioContext **aio_context,
Error **errp)
{
BlockJob *job;
assert(id != NULL);
*aio_context = NULL;
job = block_job_get(id);
if (!job) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
"Block job '%s' not found", id);
return NULL;
}
*aio_context = blk_get_aio_context(job->blk);
aio_context_acquire(*aio_context);
return job;
}
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(&job->job) && !force) {
error_setg(errp, "The block job for device '%s' is currently paused",
device);
goto out;
}
trace_qmp_block_job_cancel(job);
job_user_cancel(&job->job, force, errp);
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) {
return;
}
trace_qmp_block_job_pause(job);
job_user_pause(&job->job, errp);
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) {
return;
}
trace_qmp_block_job_resume(job);
job_user_resume(&job->job, errp);
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);
job_complete(&job->job, errp);
aio_context_release(aio_context);
}
void qmp_block_job_finalize(const char *id, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(id, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_block_job_finalize(job);
job_ref(&job->job);
job_finalize(&job->job, errp);
/*
* Job's context might have changed via job_finalize (and job_txn_apply
* automatically acquires the new one), so make sure we release the correct
* one.
*/
aio_context = blk_get_aio_context(job->blk);
job_unref(&job->job);
aio_context_release(aio_context);
}
void qmp_block_job_dismiss(const char *id, Error **errp)
{
AioContext *aio_context;
BlockJob *bjob = find_block_job(id, &aio_context, errp);
Job *job;
if (!bjob) {
return;
}
trace_qmp_block_job_dismiss(bjob);
job = &bjob->job;
job_dismiss(&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)
{
BlockDriverState *bs = NULL;
AioContext *aio_context;
BlockDriverState *image_bs = NULL;
Error *local_err = NULL;
bool ro;
int ret;
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return;
}
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 */
ro = bdrv_is_read_only(image_bs);
if (ro) {
if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
goto out;
}
}
ret = bdrv_change_backing_file(image_bs, backing_file,
image_bs->drv ? image_bs->drv->format_name : "",
false);
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_set_read_only(image_bs, true, errp);
}
out:
aio_context_release(aio_context);
}
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
BlockDriverState *bs;
QObject *obj;
Visitor *v = qobject_output_visitor_new(&obj);
QDict *qdict;
visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
visit_complete(v, &obj);
qdict = qobject_to(QDict, obj);
qdict_flatten(qdict);
if (!qdict_get_try_str(qdict, "node-name")) {
error_setg(errp, "'node-name' must be specified for the root node");
goto fail;
}
bs = bds_tree_init(qdict, errp);
if (!bs) {
goto fail;
}
bdrv_set_monitor_owned(bs);
fail:
visit_free(v);
}
void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
{
BlockDriverState *bs;
AioContext *ctx;
QObject *obj;
Visitor *v = qobject_output_visitor_new(&obj);
BlockReopenQueue *queue;
QDict *qdict;
/* Check for the selected node name */
if (!options->has_node_name) {
error_setg(errp, "node-name not specified");
goto fail;
}
bs = bdrv_find_node(options->node_name);
if (!bs) {
error_setg(errp, "Failed to find node with node-name='%s'",
options->node_name);
goto fail;
}
/* Put all options in a QDict and flatten it */
visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
visit_complete(v, &obj);
qdict = qobject_to(QDict, obj);
qdict_flatten(qdict);
/* Perform the reopen operation */
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_subtree_drained_begin(bs);
queue = bdrv_reopen_queue(NULL, bs, qdict, false);
bdrv_reopen_multiple(queue, errp);
bdrv_subtree_drained_end(bs);
aio_context_release(ctx);
fail:
visit_free(v);
}
void qmp_blockdev_del(const char *node_name, Error **errp)
{
AioContext *aio_context;
BlockDriverState *bs;
bs = bdrv_find_node(node_name);
if (!bs) {
error_setg(errp, "Failed to find node with node-name='%s'", node_name);
return;
}
if (bdrv_has_blk(bs)) {
error_setg(errp, "Node %s is in use", node_name);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
goto out;
}
if (!QTAILQ_IN_USE(bs, monitor_list)) {
error_setg(errp, "Node %s is not owned by the monitor",
bs->node_name);
goto out;
}
if (bs->refcnt > 1) {
error_setg(errp, "Block device %s is in use",
bdrv_get_device_or_node_name(bs));
goto out;
}
QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
bdrv_unref(bs);
out:
aio_context_release(aio_context);
}
static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
const char *child_name)
{
BdrvChild *child;
QLIST_FOREACH(child, &parent_bs->children, next) {
if (strcmp(child->name, child_name) == 0) {
return child;
}
}
return NULL;
}
void qmp_x_blockdev_change(const char *parent, bool has_child,
const char *child, bool has_node,
const char *node, Error **errp)
{
BlockDriverState *parent_bs, *new_bs = NULL;
BdrvChild *p_child;
parent_bs = bdrv_lookup_bs(parent, parent, errp);
if (!parent_bs) {
return;
}
if (has_child == has_node) {
if (has_child) {
error_setg(errp, "The parameters child and node are in conflict");
} else {
error_setg(errp, "Either child or node must be specified");
}
return;
}
if (has_child) {
p_child = bdrv_find_child(parent_bs, child);
if (!p_child) {
error_setg(errp, "Node '%s' does not have child '%s'",
parent, child);
return;
}
bdrv_del_child(parent_bs, p_child, errp);
}
if (has_node) {
new_bs = bdrv_find_node(node);
if (!new_bs) {
error_setg(errp, "Node '%s' not found", node);
return;
}
bdrv_add_child(parent_bs, new_bs, errp);
}
}
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
BlockJobInfoList *head = NULL, **tail = &head;
BlockJob *job;
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
BlockJobInfo *value;
AioContext *aio_context;
if (block_job_is_internal(job)) {
continue;
}
aio_context = blk_get_aio_context(job->blk);
aio_context_acquire(aio_context);
value = block_job_query(job, errp);
aio_context_release(aio_context);
if (!value) {
qapi_free_BlockJobInfoList(head);
return NULL;
}
QAPI_LIST_APPEND(tail, value);
}
return head;
}
void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
bool has_force, bool force, Error **errp)
{
AioContext *old_context;
AioContext *new_context;
BlockDriverState *bs;
bs = bdrv_find_node(node_name);
if (!bs) {
error_setg(errp, "Failed to find node with node-name='%s'", node_name);
return;
}
/* Protects against accidents. */
if (!(has_force && force) && bdrv_has_blk(bs)) {
error_setg(errp, "Node %s is associated with a BlockBackend and could "
"be in use (use force=true to override this check)",
node_name);
return;
}
if (iothread->type == QTYPE_QSTRING) {
IOThread *obj = iothread_by_id(iothread->u.s);
if (!obj) {
error_setg(errp, "Cannot find iothread %s", iothread->u.s);
return;
}
new_context = iothread_get_aio_context(obj);
} else {
new_context = qemu_get_aio_context();
}
old_context = bdrv_get_aio_context(bs);
aio_context_acquire(old_context);
bdrv_try_set_aio_context(bs, new_context, errp);
aio_context_release(old_context);
}
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 = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native, io_uring)",
},{
.name = BDRV_OPT_CACHE_WB,
.type = QEMU_OPT_BOOL,
.help = "Enable writeback mode",
},{
.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 = BDRV_OPT_READ_ONLY,
.type = QEMU_OPT_BOOL,
.help = "open drive file as read-only",
},
THROTTLE_OPTS,
{
.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)",
},{
.name = "stats-account-invalid",
.type = QEMU_OPT_BOOL,
.help = "whether to account for invalid I/O operations "
"in the statistics",
},{
.name = "stats-account-failed",
.type = QEMU_OPT_BOOL,
.help = "whether to account for failed I/O operations "
"in the statistics",
},
{ /* 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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