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qemu/blockdev.c
Kevin Wolf b7cfc7d58e block: Mark bdrv_refresh_filename() and callers GRAPH_RDLOCK 
This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_refresh_filename() need to hold a reader lock for the graph
because it accesses the children list of a node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-11-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-10-12 16:31:33 +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/dirty-bitmap.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/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"
/* Protected by BQL */
QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
void bdrv_set_monitor_owned(BlockDriverState *bs)
{
GLOBAL_STATE_CODE();
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;
GLOBAL_STATE_CODE();
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;
GLOBAL_STATE_CODE();
if (!dinfo) {
return;
}
JOB_LOCK_GUARD();
do {
job = block_job_next_locked(NULL);
while (job && (job->job.cancelled ||
job->job.deferred_to_main_loop ||
!block_job_has_bdrv(job, blk_bs(blk))))
{
job = block_job_next_locked(job);
}
if (job) {
/*
* This drops the job lock temporarily and polls, so we need to
* restart processing the list from the start after this.
*/
job_cancel_locked(&job->job, false);
}
} while (job);
dinfo->auto_del = 1;
}
void blockdev_auto_del(BlockBackend *blk)
{
DriveInfo *dinfo = blk_legacy_dinfo(blk);
GLOBAL_STATE_CODE();
if (dinfo && dinfo->auto_del) {
monitor_remove_blk(blk);
blk_unref(blk);
}
}
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_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
QemuOpts *opts;
GLOBAL_STATE_CODE();
opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
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;
GLOBAL_STATE_CODE();
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;
GLOBAL_STATE_CODE();
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)
{
GLOBAL_STATE_CODE();
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;
GLOBAL_STATE_CODE();
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;
}
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: {
uint64_t length;
const char *str = qstring_get_str(qobject_to(QString,
entry->value));
if (parse_uint_full(str, 10, &length) == 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;
}
}
}
static OnOffAuto account_get_opt(QemuOpts *opts, const char *name)
{
if (!qemu_opt_find(opts, name)) {
return ON_OFF_AUTO_AUTO;
}
if (qemu_opt_get_bool(opts, name, true)) {
return ON_OFF_AUTO_ON;
}
return ON_OFF_AUTO_OFF;
}
/* 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;
OnOffAuto 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 = account_get_opt(opts, "stats-account-invalid");
account_failed = account_get_opt(opts, "stats-account-failed");
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 | (read_only ? 0 : BDRV_O_RDWR);
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)
{
BlockDriverState *bs;
int bdrv_flags = 0;
GLOBAL_STATE_CODE();
/* 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;
}
aio_context_acquire(qemu_get_aio_context());
bs = bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
aio_context_release(qemu_get_aio_context());
return bs;
}
void blockdev_close_all_bdrv_states(void)
{
BlockDriverState *bs, *next_bs;
GLOBAL_STATE_CODE();
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)
{
GLOBAL_STATE_CODE();
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;
GLOBAL_STATE_CODE();
/* 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;
AioContext *aio_context;
GRAPH_RDLOCK_GUARD_MAINLOOP();
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;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!bdrv_is_inserted(bs)) {
error_setg(errp, "Device has no medium");
bs = NULL;
}
aio_context_release(aio_context);
return bs;
}
static void blockdev_do_action(TransactionAction *action, Error **errp)
{
TransactionActionList list;
list.value = action;
list.next = NULL;
qmp_transaction(&list, NULL, errp);
}
void qmp_blockdev_snapshot_sync(const char *device, const char *node_name,
const char *snapshot_file,
const char *snapshot_node_name,
const char *format,
bool has_mode, NewImageMode mode, Error **errp)
{
BlockdevSnapshotSync snapshot = {
.device = (char *) device,
.node_name = (char *) node_name,
.snapshot_file = (char *) snapshot_file,
.snapshot_node_name = (char *) snapshot_node_name,
.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,
const char *id,
const char *name,
Error **errp)
{
BlockDriverState *bs;
AioContext *aio_context;
QEMUSnapshotInfo sn;
Error *local_err = NULL;
SnapshotInfo *info = NULL;
int ret;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
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;
}
/* internal snapshot private data */
typedef struct InternalSnapshotState {
BlockDriverState *bs;
QEMUSnapshotInfo sn;
bool created;
} InternalSnapshotState;
static void internal_snapshot_abort(void *opaque);
static void internal_snapshot_clean(void *opaque);
TransactionActionDrv internal_snapshot_drv = {
.abort = internal_snapshot_abort,
.clean = internal_snapshot_clean,
};
static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
Transaction *tran, Error **errp)
{
Error *local_err = NULL;
const char *device;
const char *name;
BlockDriverState *bs;
QEMUSnapshotInfo old_sn, *sn;
bool ret;
int64_t rt;
InternalSnapshotState *state = g_new0(InternalSnapshotState, 1);
AioContext *aio_context;
int ret1;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
tran_add(tran, &internal_snapshot_drv, state);
device = internal->device;
name = internal->name;
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);
rt = g_get_real_time();
sn->date_sec = rt / G_USEC_PER_SEC;
sn->date_nsec = (rt % G_USEC_PER_SEC) * 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(void *opaque)
{
InternalSnapshotState *state = opaque;
BlockDriverState *bs = state->bs;
QEMUSnapshotInfo *sn = &state->sn;
AioContext *aio_context;
Error *local_error = NULL;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
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(void *opaque)
{
g_autofree InternalSnapshotState *state = opaque;
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 {
BlockDriverState *old_bs;
BlockDriverState *new_bs;
bool overlay_appended;
} ExternalSnapshotState;
static void external_snapshot_commit(void *opaque);
static void external_snapshot_abort(void *opaque);
static void external_snapshot_clean(void *opaque);
TransactionActionDrv external_snapshot_drv = {
.commit = external_snapshot_commit,
.abort = external_snapshot_abort,
.clean = external_snapshot_clean,
};
static void external_snapshot_action(TransactionAction *action,
Transaction *tran, 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 = g_new0(ExternalSnapshotState, 1);
AioContext *aio_context;
uint64_t perm, shared;
/* TODO We'll eventually have to take a writer lock in this function */
GRAPH_RDLOCK_GUARD_MAINLOOP();
tran_add(tran, &external_snapshot_drv, state);
/* '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->device;
node_name = s->node_name;
new_image_file = s->snapshot_file;
snapshot_ref = NULL;
}
break;
default:
g_assert_not_reached();
}
/* start processing */
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->format ?: "qcow2";
enum NewImageMode mode;
const char *snapshot_node_name = s->snapshot_node_name;
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);
aio_context_release(aio_context);
bdrv_img_create(new_image_file, format,
state->old_bs->filename,
state->old_bs->drv->format_name,
NULL, size, flags, false, &local_err);
aio_context_acquire(aio_context);
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);
}
aio_context_release(aio_context);
aio_context_acquire(qemu_get_aio_context());
state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
errp);
aio_context_release(qemu_get_aio_context());
/* We will manually add the backing_hd field to the bs later */
if (!state->new_bs) {
return;
}
aio_context_acquire(aio_context);
/*
* 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(void *opaque)
{
ExternalSnapshotState *state = opaque;
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(void *opaque)
{
ExternalSnapshotState *state = opaque;
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_change_aio_context(state->old_bs,
aio_context, NULL, 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(void *opaque)
{
g_autofree ExternalSnapshotState *state = opaque;
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 {
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_commit(void *opaque);
static void drive_backup_abort(void *opaque);
static void drive_backup_clean(void *opaque);
TransactionActionDrv drive_backup_drv = {
.commit = drive_backup_commit,
.abort = drive_backup_abort,
.clean = drive_backup_clean,
};
static void drive_backup_action(DriveBackup *backup,
JobTxn *block_job_txn,
Transaction *tran, Error **errp)
{
DriveBackupState *state = g_new0(DriveBackupState, 1);
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
AioContext *aio_context;
AioContext *old_context;
const char *format;
QDict *options;
Error *local_err = NULL;
int flags;
int64_t size;
bool set_backing_hd = false;
int ret;
GLOBAL_STATE_CODE();
tran_add(tran, &drive_backup_drv, state);
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);
state->bs = bs;
/* Paired with .clean() */
bdrv_drained_begin(bs);
format = backup->format;
if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) {
format = 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(format);
if (source) {
/* Implicit filters should not appear in the filename */
BlockDriverState *explicit_backing =
bdrv_skip_implicit_filters(source);
bdrv_graph_rdlock_main_loop();
bdrv_refresh_filename(explicit_backing);
bdrv_graph_rdunlock_main_loop();
bdrv_img_create(backup->target, format,
explicit_backing->filename,
explicit_backing->drv->format_name, NULL,
size, flags, false, &local_err);
} else {
bdrv_img_create(backup->target, 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 (format) {
qdict_put_str(options, "driver", format);
}
aio_context_release(aio_context);
aio_context_acquire(qemu_get_aio_context());
target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
aio_context_release(qemu_get_aio_context());
if (!target_bs) {
return;
}
/* Honor bdrv_try_change_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_acquire(old_context);
ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, 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->job = do_backup_common(qapi_DriveBackup_base(backup),
bs, target_bs, aio_context,
block_job_txn, errp);
unref:
bdrv_unref(target_bs);
out:
aio_context_release(aio_context);
}
static void drive_backup_commit(void *opaque)
{
DriveBackupState *state = opaque;
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(void *opaque)
{
DriveBackupState *state = opaque;
if (state->job) {
job_cancel_sync(&state->job->job, true);
}
}
static void drive_backup_clean(void *opaque)
{
g_autofree DriveBackupState *state = opaque;
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 {
BlockDriverState *bs;
BlockJob *job;
} BlockdevBackupState;
static void blockdev_backup_commit(void *opaque);
static void blockdev_backup_abort(void *opaque);
static void blockdev_backup_clean(void *opaque);
TransactionActionDrv blockdev_backup_drv = {
.commit = blockdev_backup_commit,
.abort = blockdev_backup_abort,
.clean = blockdev_backup_clean,
};
static void blockdev_backup_action(BlockdevBackup *backup,
JobTxn *block_job_txn,
Transaction *tran, Error **errp)
{
BlockdevBackupState *state = g_new0(BlockdevBackupState, 1);
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
AioContext *old_context;
int ret;
tran_add(tran, &blockdev_backup_drv, state);
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_change_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_change_aio_context(target_bs, aio_context, NULL, 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,
block_job_txn, errp);
aio_context_release(aio_context);
}
static void blockdev_backup_commit(void *opaque)
{
BlockdevBackupState *state = opaque;
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(void *opaque)
{
BlockdevBackupState *state = opaque;
if (state->job) {
job_cancel_sync(&state->job->job, true);
}
}
static void blockdev_backup_clean(void *opaque)
{
g_autofree BlockdevBackupState *state = opaque;
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 {
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
HBitmap *backup;
bool was_enabled;
} BlockDirtyBitmapState;
static void block_dirty_bitmap_add_abort(void *opaque);
TransactionActionDrv block_dirty_bitmap_add_drv = {
.abort = block_dirty_bitmap_add_abort,
.clean = g_free,
};
static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action,
Transaction *tran, Error **errp)
{
Error *local_err = NULL;
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_add_drv, state);
/* 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->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
NULL, &error_abort);
} else {
error_propagate(errp, local_err);
}
}
static void block_dirty_bitmap_add_abort(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
if (state->bitmap) {
bdrv_release_dirty_bitmap(state->bitmap);
}
}
static void block_dirty_bitmap_restore(void *opaque);
static void block_dirty_bitmap_free_backup(void *opaque);
TransactionActionDrv block_dirty_bitmap_clear_drv = {
.abort = block_dirty_bitmap_restore,
.commit = block_dirty_bitmap_free_backup,
.clean = g_free,
};
static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action,
Transaction *tran, Error **errp)
{
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_clear_drv, state);
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(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
if (state->backup) {
bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
}
}
static void block_dirty_bitmap_free_backup(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
hbitmap_free(state->backup);
}
static void block_dirty_bitmap_enable_abort(void *opaque);
TransactionActionDrv block_dirty_bitmap_enable_drv = {
.abort = block_dirty_bitmap_enable_abort,
.clean = g_free,
};
static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action,
Transaction *tran, Error **errp)
{
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_enable_drv, state);
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(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
if (!state->was_enabled) {
bdrv_disable_dirty_bitmap(state->bitmap);
}
}
static void block_dirty_bitmap_disable_abort(void *opaque);
TransactionActionDrv block_dirty_bitmap_disable_drv = {
.abort = block_dirty_bitmap_disable_abort,
.clean = g_free,
};
static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action,
Transaction *tran, Error **errp)
{
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_disable_drv, state);
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(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
if (state->was_enabled) {
bdrv_enable_dirty_bitmap(state->bitmap);
}
}
TransactionActionDrv block_dirty_bitmap_merge_drv = {
.commit = block_dirty_bitmap_free_backup,
.abort = block_dirty_bitmap_restore,
.clean = g_free,
};
static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action,
Transaction *tran, Error **errp)
{
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_merge_drv, state);
state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
action->bitmaps, &state->backup,
errp);
}
static void block_dirty_bitmap_remove_commit(void *opaque);
static void block_dirty_bitmap_remove_abort(void *opaque);
TransactionActionDrv block_dirty_bitmap_remove_drv = {
.commit = block_dirty_bitmap_remove_commit,
.abort = block_dirty_bitmap_remove_abort,
.clean = g_free,
};
static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action,
Transaction *tran, Error **errp)
{
BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
tran_add(tran, &block_dirty_bitmap_remove_drv, state);
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(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
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(void *opaque)
{
BlockDirtyBitmapState *state = opaque;
bdrv_dirty_bitmap_set_busy(state->bitmap, false);
bdrv_release_dirty_bitmap(state->bitmap);
}
static void abort_commit(void *opaque);
TransactionActionDrv abort_drv = {
.commit = abort_commit,
};
static void abort_action(Transaction *tran, Error **errp)
{
tran_add(tran, &abort_drv, NULL);
error_setg(errp, "Transaction aborted using Abort action");
}
static void abort_commit(void *opaque)
{
g_assert_not_reached(); /* this action never succeeds */
}
static void transaction_action(TransactionAction *act, JobTxn *block_job_txn,
Transaction *tran, Error **errp)
{
switch (act->type) {
case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
external_snapshot_action(act, tran, errp);
return;
case TRANSACTION_ACTION_KIND_DRIVE_BACKUP:
drive_backup_action(act->u.drive_backup.data,
block_job_txn, tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP:
blockdev_backup_action(act->u.blockdev_backup.data,
block_job_txn, tran, errp);
return;
case TRANSACTION_ACTION_KIND_ABORT:
abort_action(tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC:
internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data,
tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD:
block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data,
tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR:
block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data,
tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE:
block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data,
tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE:
block_dirty_bitmap_disable_action(
act->u.block_dirty_bitmap_disable.data, tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE:
block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data,
tran, errp);
return;
case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE:
block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data,
tran, errp);
return;
/*
* 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.
*/
case TRANSACTION_ACTION_KIND__MAX:
default:
g_assert_not_reached();
};
}
/*
* 'Atomic' group operations. The operations are performed as a set, and if
* any fail then we roll back all operations in the group.
*
* Always run under BQL.
*/
void qmp_transaction(TransactionActionList *actions,
struct TransactionProperties *properties,
Error **errp)
{
TransactionActionList *act;
JobTxn *block_job_txn = NULL;
Error *local_err = NULL;
Transaction *tran;
ActionCompletionMode comp_mode =
properties ? properties->completion_mode :
ACTION_COMPLETION_MODE_INDIVIDUAL;
GLOBAL_STATE_CODE();
/* Does this transaction get canceled as a group on failure?
* If not, we don't really need to make a JobTxn.
*/
if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
for (act = actions; act; act = act->next) {
TransactionActionKind type = act->value->type;
if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP &&
type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP)
{
error_setg(errp,
"Action '%s' does not support transaction property "
"completion-mode = %s",
TransactionActionKind_str(type),
ActionCompletionMode_str(comp_mode));
return;
}
}
block_job_txn = job_txn_new();
}
/* drain all i/o before any operations */
bdrv_drain_all();
tran = tran_new();
/* We don't do anything in this loop that commits us to the operations */
for (act = actions; act; act = act->next) {
transaction_action(act->value, block_job_txn, tran, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
}
tran_commit(tran);
/* success */
goto exit;
delete_and_fail:
/* failure, and it is all-or-none; roll back all operations */
tran_abort(tran);
exit:
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(const char *device, const char *node_name,
int64_t size, Error **errp)
{
Error *local_err = NULL;
BlockBackend *blk;
BlockDriverState *bs;
AioContext *old_ctx;
bs = bdrv_lookup_bs(device, node_name, &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_co_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_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
bdrv_co_leave(bs, old_ctx);
bdrv_co_lock(bs);
bdrv_drained_end(bs);
blk_co_unref(blk);
bdrv_co_unlock(bs);
}
void qmp_block_stream(const char *job_id, const char *device,
const char *base,
const char *base_node,
const char *backing_file,
const char *bottom,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
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;
GLOBAL_STATE_CODE();
if (base && base_node) {
error_setg(errp, "'base' and 'base-node' cannot be specified "
"at the same time");
return;
}
if (base && bottom) {
error_setg(errp, "'base' and 'bottom' cannot be specified "
"at the same time");
return;
}
if (bottom && 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 (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 (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_graph_rdlock_main_loop();
bdrv_refresh_filename(base_bs);
bdrv_graph_rdunlock_main_loop();
}
if (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 = 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 && 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(job_id, 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(const char *job_id, const char *device,
const char *base_node,
const char *base,
const char *top_node,
const char *top,
const char *backing_file,
bool has_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
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;
/* TODO We'll eventually have to take a writer lock in this function */
GRAPH_RDLOCK_GUARD_MAINLOOP();
if (!has_speed) {
speed = 0;
}
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
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 (top_node && top) {
error_setg(errp, "'top-node' and 'top' are mutually exclusive");
goto out;
} else if (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 (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 (base_node && base) {
error_setg(errp, "'base-node' and 'base' are mutually exclusive");
goto out;
} else if (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 (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 (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 (!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(job_id, bs, base_bs, top_bs, job_flags,
speed, on_error, backing_file,
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_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->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->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->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)
{
GRAPH_RDLOCK_GUARD_MAINLOOP();
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,
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,
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;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
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_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 (!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;
}
}
if (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,
replaces, 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->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->replaces) {
if (!arg->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_graph_rdlock_main_loop();
bdrv_refresh_filename(explicit_backing);
bdrv_graph_rdunlock_main_loop();
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->node_name) {
qdict_put_str(options, "node-name", arg->node_name);
}
if (format) {
qdict_put_str(options, "driver", format);
}
aio_context_release(aio_context);
/* Mirroring takes care of copy-on-write using the source's backing
* file.
*/
aio_context_acquire(qemu_get_aio_context());
target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
aio_context_release(qemu_get_aio_context());
if (!target_bs) {
return;
}
zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
(arg->mode == NEW_IMAGE_MODE_EXISTING ||
!bdrv_has_zero_init(target_bs)));
/* Honor bdrv_try_change_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_acquire(old_context);
ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, 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->job_id, bs, target_bs,
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,
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(const char *job_id,
const char *device, const char *target,
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,
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_change_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_change_aio_context(target_bs, aio_context, NULL, errp);
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (ret < 0) {
goto out;
}
blockdev_mirror_common(job_id, bs, target_bs,
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, 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. Called with job_mutex held.
*/
static BlockJob *find_block_job_locked(const char *id, Error **errp)
{
BlockJob *job;
assert(id != NULL);
job = block_job_get_locked(id);
if (!job) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
"Block job '%s' not found", id);
return NULL;
}
return job;
}
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(device, errp);
if (!job) {
return;
}
block_job_set_speed_locked(job, speed, errp);
}
void qmp_block_job_cancel(const char *device,
bool has_force, bool force, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(device, errp);
if (!job) {
return;
}
if (!has_force) {
force = false;
}
if (job_user_paused_locked(&job->job) && !force) {
error_setg(errp, "The block job for device '%s' is currently paused",
device);
return;
}
trace_qmp_block_job_cancel(job);
job_user_cancel_locked(&job->job, force, errp);
}
void qmp_block_job_pause(const char *device, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(device, errp);
if (!job) {
return;
}
trace_qmp_block_job_pause(job);
job_user_pause_locked(&job->job, errp);
}
void qmp_block_job_resume(const char *device, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(device, errp);
if (!job) {
return;
}
trace_qmp_block_job_resume(job);
job_user_resume_locked(&job->job, errp);
}
void qmp_block_job_complete(const char *device, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(device, errp);
if (!job) {
return;
}
trace_qmp_block_job_complete(job);
job_complete_locked(&job->job, errp);
}
void qmp_block_job_finalize(const char *id, Error **errp)
{
BlockJob *job;
JOB_LOCK_GUARD();
job = find_block_job_locked(id, errp);
if (!job) {
return;
}
trace_qmp_block_job_finalize(job);
job_ref_locked(&job->job);
job_finalize_locked(&job->job, errp);
job_unref_locked(&job->job);
}
void qmp_block_job_dismiss(const char *id, Error **errp)
{
BlockJob *bjob;
Job *job;
JOB_LOCK_GUARD();
bjob = find_block_job_locked(id, errp);
if (!bjob) {
return;
}
trace_qmp_block_job_dismiss(bjob);
job = &bjob->job;
job_dismiss_locked(&job, errp);
}
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_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp)
{
BlockReopenQueue *queue = NULL;
/* Add each one of the BDS that we want to reopen to the queue */
for (; reopen_list != NULL; reopen_list = reopen_list->next) {
BlockdevOptions *options = reopen_list->value;
BlockDriverState *bs;
AioContext *ctx;
QObject *obj;
Visitor *v;
QDict *qdict;
/* Check for the selected node name */
if (!options->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 */
v = qobject_output_visitor_new(&obj);
visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
visit_complete(v, &obj);
visit_free(v);
qdict = qobject_to(QDict, obj);
qdict_flatten(qdict);
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
queue = bdrv_reopen_queue(queue, bs, qdict, false);
aio_context_release(ctx);
}
/* Perform the reopen operation */
bdrv_reopen_multiple(queue, errp);
queue = NULL;
fail:
bdrv_reopen_queue_free(queue);
}
void qmp_blockdev_del(const char *node_name, Error **errp)
{
AioContext *aio_context;
BlockDriverState *bs;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
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 * GRAPH_RDLOCK
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, const char *child,
const char *node, Error **errp)
{
BlockDriverState *parent_bs, *new_bs = NULL;
BdrvChild *p_child;
bdrv_graph_wrlock(NULL);
parent_bs = bdrv_lookup_bs(parent, parent, errp);
if (!parent_bs) {
goto out;
}
if (!child == !node) {
if (child) {
error_setg(errp, "The parameters child and node are in conflict");
} else {
error_setg(errp, "Either child or node must be specified");
}
goto out;
}
if (child) {
p_child = bdrv_find_child(parent_bs, child);
if (!p_child) {
error_setg(errp, "Node '%s' does not have child '%s'",
parent, child);
goto out;
}
bdrv_del_child(parent_bs, p_child, errp);
}
if (node) {
new_bs = bdrv_find_node(node);
if (!new_bs) {
error_setg(errp, "Node '%s' not found", node);
goto out;
}
bdrv_add_child(parent_bs, new_bs, errp);
}
out:
bdrv_graph_wrunlock();
}
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
BlockJobInfoList *head = NULL, **tail = &head;
BlockJob *job;
JOB_LOCK_GUARD();
for (job = block_job_next_locked(NULL); job;
job = block_job_next_locked(job)) {
BlockJobInfo *value;
if (block_job_is_internal(job)) {
continue;
}
value = block_job_query_locked(job, errp);
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;
GRAPH_RDLOCK_GUARD_MAINLOOP();
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_change_aio_context(bs, new_context, NULL, 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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