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qemu/blockdev.c
Stefan Hajnoczi b9464ba19f blockdev: hold AioContext for bdrv_unref() in external_snapshot_clean() 
bdrv_unref() requires the AioContext lock because bdrv_flush() uses
BDRV_POLL_WHILE(), which assumes the AioContext is currently held.  If
BDRV_POLL_WHILE() runs without AioContext held the
pthread_mutex_unlock() call in aio_context_release() fails.

This patch moves bdrv_unref() into the AioContext locked region to solve
the following pthread_mutex_unlock() failure:

  #0  0x00007f566181969b in raise () at /lib64/libc.so.6
  #1  0x00007f566181b3b1 in abort () at /lib64/libc.so.6
  #2  0x00005592cd590458 in error_exit (err=<optimized out>, msg=msg@entry=0x5592cdaf6d60 <__func__.23977> "qemu_mutex_unlock") at util/qemu-thread-posix.c:36
  #3  0x00005592cd96e738 in qemu_mutex_unlock (mutex=mutex@entry=0x5592ce9505e0) at util/qemu-thread-posix.c:96
  #4  0x00005592cd969b69 in aio_context_release (ctx=ctx@entry=0x5592ce950580) at util/async.c:507
  #5  0x00005592cd8ead78 in bdrv_flush (bs=bs@entry=0x5592cfa87210) at block/io.c:2478
  #6  0x00005592cd89df30 in bdrv_close (bs=0x5592cfa87210) at block.c:3207
  #7  0x00005592cd89df30 in bdrv_delete (bs=0x5592cfa87210) at block.c:3395
  #8  0x00005592cd89df30 in bdrv_unref (bs=0x5592cfa87210) at block.c:4418
  #9  0x00005592cd6b7f86 in qmp_transaction (dev_list=<optimized out>, has_props=<optimized out>, props=<optimized out>, errp=errp@entry=0x7ffe4a1fc9d8) at blockdev.c:2308

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171206144550.22295-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-12-19 10:25:08 +00:00

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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/throttle-groups.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qapi/qmp/types.h"
#include "qapi-visit.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qobject-output-visitor.h"
#include "sysemu/sysemu.h"
#include "block/block_int.h"
#include "qmp-commands.h"
#include "block/trace.h"
#include "sysemu/arch_init.h"
#include "sysemu/qtest.h"
#include "qemu/cutils.h"
#include "qemu/help_option.h"
#include "qemu/throttle-options.h"
static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
static int do_open_tray(const char *blk_name, const char *qdev_id,
bool force, Error **errp);
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);
BlockDriverState *bs = blk_bs(blk);
AioContext *aio_context;
if (!dinfo) {
return;
}
if (bs) {
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bs->job) {
block_job_cancel(bs->job);
}
aio_context_release(aio_context);
}
dinfo->auto_del = 1;
}
void blockdev_auto_del(BlockBackend *blk)
{
DriveInfo *dinfo = blk_legacy_dinfo(blk);
if (dinfo && dinfo->auto_del) {
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;
}
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);
if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
dinfo->type != IF_NONE) {
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)
{
error_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 (!strcmp(aio, "native")) {
*bdrv_flags |= BDRV_O_NATIVE_AIO;
} else if (!strcmp(aio, "threads")) {
/* this is the default */
} else {
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, &error);
if (error) {
error_propagate(errp, error);
goto err_no_opts;
}
qemu_opts_absorb_qdict(opts, bs_opts, &error);
if (error) {
error_propagate(errp, error);
goto early_err;
}
if (id) {
qdict_del(bs_opts, "id");
}
/* 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)) {
error_printf("Supported formats:");
bdrv_iterate_format(bdrv_format_print, NULL);
error_printf("\n");
goto early_err;
}
if (qdict_haskey(bs_opts, "driver")) {
error_setg(errp, "Cannot specify both 'driver' and 'format'");
goto early_err;
}
qdict_put_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(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;
QDECREF(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");
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);
QDECREF(interval_dict);
QDECREF(interval_list);
return blk;
early_err:
qemu_opts_del(opts);
QDECREF(interval_dict);
QDECREF(interval_list);
err_no_opts:
QDECREF(bs_opts);
return NULL;
}
/* Takes the ownership of bs_opts */
static 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 void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
Error **errp)
{
const char *value;
value = qemu_opt_get(opts, from);
if (value) {
if (qemu_opt_find(opts, to)) {
error_setg(errp, "'%s' and its alias '%s' can't be used at the "
"same time", to, from);
return;
}
}
/* rename all items in opts */
while ((value = qemu_opt_get(opts, from))) {
qemu_opt_set(opts, to, value, &error_abort);
qemu_opt_unset(opts, from);
}
}
QemuOptsList qemu_legacy_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
.desc = {
{
.name = "bus",
.type = QEMU_OPT_NUMBER,
.help = "bus number",
},{
.name = "unit",
.type = QEMU_OPT_NUMBER,
.help = "unit number (i.e. lun for scsi)",
},{
.name = "index",
.type = QEMU_OPT_NUMBER,
.help = "index number",
},{
.name = "media",
.type = QEMU_OPT_STRING,
.help = "media type (disk, cdrom)",
},{
.name = "if",
.type = QEMU_OPT_STRING,
.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
},{
.name = "cyls",
.type = QEMU_OPT_NUMBER,
.help = "number of cylinders (ide disk geometry)",
},{
.name = "heads",
.type = QEMU_OPT_NUMBER,
.help = "number of heads (ide disk geometry)",
},{
.name = "secs",
.type = QEMU_OPT_NUMBER,
.help = "number of sectors (ide disk geometry)",
},{
.name = "trans",
.type = QEMU_OPT_STRING,
.help = "chs translation (auto, lba, none)",
},{
.name = "boot",
.type = QEMU_OPT_BOOL,
.help = "(deprecated, ignored)",
},{
.name = "addr",
.type = QEMU_OPT_STRING,
.help = "pci address (virtio only)",
},{
.name = "serial",
.type = QEMU_OPT_STRING,
.help = "disk serial number",
},{
.name = "file",
.type = QEMU_OPT_STRING,
.help = "file name",
},
/* Options that are passed on, but have special semantics with -drive */
{
.name = 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)
{
const char *value;
BlockBackend *blk;
DriveInfo *dinfo = NULL;
QDict *bs_opts;
QemuOpts *legacy_opts;
DriveMediaType media = MEDIA_DISK;
BlockInterfaceType type;
int cyls, heads, secs, translation;
int max_devs, bus_id, unit_id, index;
const char *devaddr;
const char *werror, *rerror;
bool read_only = false;
bool copy_on_read;
const char *serial;
const char *filename;
Error *local_err = NULL;
int i;
const char *deprecated[] = {
"serial", "trans", "secs", "heads", "cyls", "addr"
};
/* 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++) {
qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
&local_err);
if (local_err) {
error_report_err(local_err);
return NULL;
}
}
value = qemu_opt_get(all_opts, "cache");
if (value) {
int flags = 0;
bool writethrough;
if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
error_report("invalid cache option");
return NULL;
}
/* Specific options take precedence */
if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
!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);
qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
if (local_err) {
error_report_err(local_err);
goto fail;
}
/* Deprecated option boot=[on|off] */
if (qemu_opt_get(legacy_opts, "boot") != NULL) {
fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
"ignored. Future versions will reject this parameter. Please "
"update your scripts.\n");
}
/* Other deprecated options */
if (!qtest_enabled()) {
for (i = 0; i < ARRAY_SIZE(deprecated); i++) {
if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) {
error_report("'%s' is deprecated, please use the corresponding "
"option of '-device' instead", deprecated[i]);
}
}
}
/* Media type */
value = qemu_opt_get(legacy_opts, "media");
if (value) {
if (!strcmp(value, "disk")) {
media = MEDIA_DISK;
} else if (!strcmp(value, "cdrom")) {
media = MEDIA_CDROM;
read_only = true;
} else {
error_report("'%s' invalid media", value);
goto fail;
}
}
/* copy-on-read is disabled with a warning for read-only devices */
read_only |= qemu_opt_get_bool(legacy_opts, 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_report("unsupported bus type '%s'", value);
goto fail;
}
} else {
type = block_default_type;
}
/* Geometry */
cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
heads = qemu_opt_get_number(legacy_opts, "heads", 0);
secs = qemu_opt_get_number(legacy_opts, "secs", 0);
if (cyls || heads || secs) {
if (cyls < 1) {
error_report("invalid physical cyls number");
goto fail;
}
if (heads < 1) {
error_report("invalid physical heads number");
goto fail;
}
if (secs < 1) {
error_report("invalid physical secs number");
goto fail;
}
}
translation = BIOS_ATA_TRANSLATION_AUTO;
value = qemu_opt_get(legacy_opts, "trans");
if (value != NULL) {
if (!cyls) {
error_report("'%s' trans must be used with cyls, heads and secs",
value);
goto fail;
}
if (!strcmp(value, "none")) {
translation = BIOS_ATA_TRANSLATION_NONE;
} else if (!strcmp(value, "lba")) {
translation = BIOS_ATA_TRANSLATION_LBA;
} else if (!strcmp(value, "large")) {
translation = BIOS_ATA_TRANSLATION_LARGE;
} else if (!strcmp(value, "rechs")) {
translation = BIOS_ATA_TRANSLATION_RECHS;
} else if (!strcmp(value, "auto")) {
translation = BIOS_ATA_TRANSLATION_AUTO;
} else {
error_report("'%s' invalid translation type", value);
goto fail;
}
}
if (media == MEDIA_CDROM) {
if (cyls || secs || heads) {
error_report("CHS can't be set with media=cdrom");
goto fail;
}
}
/* Device address specified by bus/unit or index.
* If none was specified, try to find the first free one. */
bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
index = qemu_opt_get_number(legacy_opts, "index", -1);
max_devs = if_max_devs[type];
if (index != -1) {
if (bus_id != 0 || unit_id != -1) {
error_report("index cannot be used with bus and unit");
goto fail;
}
bus_id = drive_index_to_bus_id(type, index);
unit_id = drive_index_to_unit_id(type, index);
}
if (unit_id == -1) {
unit_id = 0;
while (drive_get(type, bus_id, unit_id) != NULL) {
unit_id++;
if (max_devs && unit_id >= max_devs) {
unit_id -= max_devs;
bus_id++;
}
}
}
if (max_devs && unit_id >= max_devs) {
error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
goto fail;
}
if (drive_get(type, bus_id, unit_id) != NULL) {
error_report("drive with bus=%d, unit=%d (index=%d) exists",
bus_id, unit_id, index);
goto fail;
}
/* Serial number */
serial = qemu_opt_get(legacy_opts, "serial");
/* no id supplied -> create one */
if (qemu_opts_id(all_opts) == NULL) {
char *new_id;
const char *mediastr = "";
if (type == IF_IDE || type == IF_SCSI) {
mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
}
if (max_devs) {
new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
mediastr, unit_id);
} else {
new_id = g_strdup_printf("%s%s%i", if_name[type],
mediastr, unit_id);
}
qdict_put_str(bs_opts, "id", new_id);
g_free(new_id);
}
/* Add virtio block device */
devaddr = qemu_opt_get(legacy_opts, "addr");
if (devaddr && type != IF_VIRTIO) {
error_report("addr is not supported by this bus type");
goto fail;
}
if (type == IF_VIRTIO) {
QemuOpts *devopts;
devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
&error_abort);
if (arch_type == QEMU_ARCH_S390X) {
qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
} else {
qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
}
qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
&error_abort);
if (devaddr) {
qemu_opt_set(devopts, "addr", devaddr, &error_abort);
}
}
filename = qemu_opt_get(legacy_opts, "file");
/* Check werror/rerror compatibility with if=... */
werror = qemu_opt_get(legacy_opts, "werror");
if (werror != NULL) {
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
type != IF_NONE) {
error_report("werror is not supported by this bus type");
goto fail;
}
qdict_put_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_report("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, &local_err);
bs_opts = NULL;
if (!blk) {
if (local_err) {
error_report_err(local_err);
}
goto fail;
} else {
assert(!local_err);
}
/* Create legacy DriveInfo */
dinfo = g_malloc0(sizeof(*dinfo));
dinfo->opts = all_opts;
dinfo->cyls = cyls;
dinfo->heads = heads;
dinfo->secs = secs;
dinfo->trans = translation;
dinfo->type = type;
dinfo->bus = bus_id;
dinfo->unit = unit_id;
dinfo->devaddr = devaddr;
dinfo->serial = g_strdup(serial);
blk_set_legacy_dinfo(blk, dinfo);
switch(type) {
case IF_IDE:
case IF_SCSI:
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
break;
default:
break;
}
fail:
qemu_opts_del(legacy_opts);
QDECREF(bs_opts);
return dinfo;
}
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 BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
Error **errp)
{
BlockBackend *blk;
if (!blk_name == !qdev_id) {
error_setg(errp, "Need exactly one of 'device' and 'id'");
return NULL;
}
if (qdev_id) {
blk = blk_by_qdev_id(qdev_id, errp);
} else {
blk = blk_by_name(blk_name);
if (blk == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", blk_name);
}
}
return blk;
}
void hmp_commit(Monitor *mon, const QDict *qdict)
{
const char *device = qdict_get_str(qdict, "device");
BlockBackend *blk;
int ret;
if (!strcmp(device, "all")) {
ret = blk_commit_all();
} else {
BlockDriverState *bs;
AioContext *aio_context;
blk = blk_by_name(device);
if (!blk) {
monitor_printf(mon, "Device '%s' not found\n", device);
return;
}
if (!blk_is_available(blk)) {
monitor_printf(mon, "Device '%s' has no medium\n", device);
return;
}
bs = blk_bs(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
ret = bdrv_commit(bs);
aio_context_release(aio_context);
}
if (ret < 0) {
monitor_printf(mon, "'commit' error for '%s': %s\n", device,
strerror(-ret));
}
}
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;
return info;
out_aio_context:
aio_context_release(aio_context);
return NULL;
}
/**
* block_dirty_bitmap_lookup:
* Return a dirty bitmap (if present), after validating
* the node reference and bitmap names.
*
* @node: The name of the BDS node to search for bitmaps
* @name: The name of the bitmap to search for
* @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
* @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
* @errp: Output pointer for error information. Can be NULL.
*
* @return: A bitmap object on success, or NULL on failure.
*/
static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
const char *name,
BlockDriverState **pbs,
Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
if (!node) {
error_setg(errp, "Node cannot be NULL");
return NULL;
}
if (!name) {
error_setg(errp, "Bitmap name cannot be NULL");
return NULL;
}
bs = bdrv_lookup_bs(node, node, NULL);
if (!bs) {
error_setg(errp, "Node '%s' not found", node);
return NULL;
}
bitmap = bdrv_find_dirty_bitmap(bs, name);
if (!bitmap) {
error_setg(errp, "Dirty bitmap '%s' not found", name);
return NULL;
}
if (pbs) {
*pbs = bs;
}
return bitmap;
}
/* 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;
BlockJobTxn *block_job_txn;
TransactionProperties *txn_props;
QSIMPLEQ_ENTRY(BlkActionState) entry;
};
/* internal snapshot private data */
typedef struct InternalSnapshotState {
BlkActionState common;
BlockDriverState *bs;
AioContext *aio_context;
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;
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;
}
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(state->aio_context);
state->bs = bs;
bdrv_drained_begin(bs);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
return;
}
if (bdrv_is_read_only(bs)) {
error_setg(errp, "Device '%s' is read only", device);
return;
}
if (!bdrv_can_snapshot(bs)) {
error_setg(errp, "Block format '%s' used by device '%s' "
"does not support internal snapshots",
bs->drv->format_name, device);
return;
}
if (!strlen(name)) {
error_setg(errp, "Name is empty");
return;
}
/* check whether a snapshot with name exist */
ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
} else if (ret) {
error_setg(errp,
"Snapshot with name '%s' already exists on device '%s'",
name, device);
return;
}
/* 3. take the snapshot */
sn = &state->sn;
pstrcpy(sn->name, sizeof(sn->name), name);
qemu_gettimeofday(&tv);
sn->date_sec = tv.tv_sec;
sn->date_nsec = tv.tv_usec * 1000;
sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
ret1 = bdrv_snapshot_create(bs, sn);
if (ret1 < 0) {
error_setg_errno(errp, -ret1,
"Failed to create snapshot '%s' on device '%s'",
name, device);
return;
}
/* 4. succeed, mark a snapshot is created */
state->created = true;
}
static void internal_snapshot_abort(BlkActionState *common)
{
InternalSnapshotState *state =
DO_UPCAST(InternalSnapshotState, common, common);
BlockDriverState *bs = state->bs;
QEMUSnapshotInfo *sn = &state->sn;
Error *local_error = NULL;
if (!state->created) {
return;
}
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));
}
}
static void internal_snapshot_clean(BlkActionState *common)
{
InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
common, common);
if (state->aio_context) {
if (state->bs) {
bdrv_drained_end(state->bs);
}
aio_context_release(state->aio_context);
}
}
/* external snapshot private data */
typedef struct ExternalSnapshotState {
BlkActionState common;
BlockDriverState *old_bs;
BlockDriverState *new_bs;
AioContext *aio_context;
bool overlay_appended;
} ExternalSnapshotState;
static void external_snapshot_prepare(BlkActionState *common,
Error **errp)
{
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;
/* '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;
}
/* Acquire AioContext now so any threads operating on old_bs stop */
state->aio_context = bdrv_get_aio_context(state->old_bs);
aio_context_acquire(state->aio_context);
bdrv_drained_begin(state->old_bs);
if (!bdrv_is_inserted(state->old_bs)) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_op_is_blocked(state->old_bs,
BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
return;
}
if (!bdrv_is_read_only(state->old_bs)) {
if (bdrv_flush(state->old_bs)) {
error_setg(errp, QERR_IO_ERROR);
return;
}
}
if (!bdrv_is_first_non_filter(state->old_bs)) {
error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
return;
}
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 snapshot node name missing");
return;
}
if (snapshot_node_name &&
bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
error_setg(errp, "New snapshot node name already in use");
return;
}
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");
return;
}
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);
return;
}
}
options = qdict_new();
if (s->has_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) {
return;
}
if (bdrv_has_blk(state->new_bs)) {
error_setg(errp, "The snapshot is already in use");
return;
}
if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
errp)) {
return;
}
if (state->new_bs->backing != NULL) {
error_setg(errp, "The snapshot already has a backing image");
return;
}
if (!state->new_bs->drv->supports_backing) {
error_setg(errp, "The snapshot does not support backing images");
return;
}
bdrv_set_aio_context(state->new_bs, state->aio_context);
/* This removes our old bs and adds the new bs. This is an operation that
* can fail, so we need to do it in .prepare; undoing it for abort is
* always possible. */
bdrv_ref(state->new_bs);
bdrv_append(state->new_bs, state->old_bs, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
state->overlay_appended = true;
}
static void external_snapshot_commit(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
/* 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 (!atomic_read(&state->old_bs->copy_on_read)) {
bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}
}
static void external_snapshot_abort(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
if (state->new_bs) {
if (state->overlay_appended) {
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);
bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
}
}
}
static void external_snapshot_clean(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
if (state->aio_context) {
bdrv_drained_end(state->old_bs);
bdrv_unref(state->new_bs);
aio_context_release(state->aio_context);
}
}
typedef struct DriveBackupState {
BlkActionState common;
BlockDriverState *bs;
AioContext *aio_context;
BlockJob *job;
} DriveBackupState;
static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
Error **errp);
static void drive_backup_prepare(BlkActionState *common, Error **errp)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
BlockDriverState *bs;
DriveBackup *backup;
Error *local_err = NULL;
assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
backup = common->action->u.drive_backup.data;
bs = qmp_get_root_bs(backup->device, errp);
if (!bs) {
return;
}
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(state->aio_context);
bdrv_drained_begin(bs);
state->bs = bs;
state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
static void drive_backup_commit(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
assert(state->job);
block_job_start(state->job);
}
static void drive_backup_abort(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
if (state->job) {
block_job_cancel_sync(state->job);
}
}
static void drive_backup_clean(BlkActionState *common)
{
DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
if (state->aio_context) {
bdrv_drained_end(state->bs);
aio_context_release(state->aio_context);
}
}
typedef struct BlockdevBackupState {
BlkActionState common;
BlockDriverState *bs;
BlockJob *job;
AioContext *aio_context;
} BlockdevBackupState;
static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
Error **errp);
static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
BlockdevBackup *backup;
BlockDriverState *bs, *target;
Error *local_err = NULL;
assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
backup = common->action->u.blockdev_backup.data;
bs = qmp_get_root_bs(backup->device, errp);
if (!bs) {
return;
}
target = bdrv_lookup_bs(backup->target, backup->target, errp);
if (!target) {
return;
}
/* AioContext is released in .clean() */
state->aio_context = bdrv_get_aio_context(bs);
if (state->aio_context != bdrv_get_aio_context(target)) {
state->aio_context = NULL;
error_setg(errp, "Backup between two IO threads is not implemented");
return;
}
aio_context_acquire(state->aio_context);
state->bs = bs;
bdrv_drained_begin(state->bs);
state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
static void blockdev_backup_commit(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
assert(state->job);
block_job_start(state->job);
}
static void blockdev_backup_abort(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
if (state->job) {
block_job_cancel_sync(state->job);
}
}
static void blockdev_backup_clean(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
if (state->aio_context) {
bdrv_drained_end(state->bs);
aio_context_release(state->aio_context);
}
}
typedef struct BlockDirtyBitmapState {
BlkActionState common;
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
AioContext *aio_context;
HBitmap *backup;
bool prepared;
} 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_autoload, action->autoload,
&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_frozen(state->bitmap)) {
error_setg(errp, "Cannot modify a frozen bitmap");
return;
} else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
error_setg(errp, "Cannot clear a disabled bitmap");
return;
} else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
error_setg(errp, "Cannot clear a readonly bitmap");
return;
}
bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
/* AioContext is released in .clean() */
}
static void block_dirty_bitmap_clear_abort(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (state->backup) {
bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
}
}
static void block_dirty_bitmap_clear_commit(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
hbitmap_free(state->backup);
}
static void block_dirty_bitmap_clear_clean(BlkActionState *common)
{
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
if (state->aio_context) {
aio_context_release(state->aio_context);
}
}
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_clear_commit,
.abort = block_dirty_bitmap_clear_abort,
.clean = block_dirty_bitmap_clear_clean,
}
};
/**
* 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;
BlockJobTxn *block_job_txn = NULL;
BlkActionState *state, *next;
Error *local_err = NULL;
QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
QSIMPLEQ_INIT(&snap_bdrv_states);
/* Does this transaction get canceled as a group on failure?
* If not, we don't really need to make a BlockJobTxn.
*/
props = get_transaction_properties(props);
if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
block_job_txn = block_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;
QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
state->ops->prepare(state, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
}
QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
if (state->ops->commit) {
state->ops->commit(state);
}
}
/* success */
goto exit;
delete_and_fail:
/* failure, and it is all-or-none; roll back all operations */
QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
if (state->ops->abort) {
state->ops->abort(state);
}
}
exit:
QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
if (state->ops->clean) {
state->ops->clean(state);
}
g_free(state);
}
if (!has_props) {
qapi_free_TransactionProperties(props);
}
block_job_txn_unref(block_job_txn);
}
void qmp_eject(bool has_device, const char *device,
bool has_id, const char *id,
bool has_force, bool force, Error **errp)
{
Error *local_err = NULL;
int rc;
if (!has_force) {
force = false;
}
rc = do_open_tray(has_device ? device : NULL,
has_id ? id : NULL,
force, &local_err);
if (rc && rc != -ENOSYS) {
error_propagate(errp, local_err);
return;
}
error_free(local_err);
qmp_x_blockdev_remove_medium(has_device, device, has_id, id, errp);
}
void qmp_block_passwd(bool has_device, const char *device,
bool has_node_name, const char *node_name,
const char *password, Error **errp)
{
error_setg(errp,
"Setting block passwords directly is no longer supported");
}
/*
* Attempt to open the tray of @device.
* If @force, ignore its tray lock.
* Else, if the tray is locked, don't open it, but ask the guest to open it.
* On error, store an error through @errp and return -errno.
* If @device does not exist, return -ENODEV.
* If it has no removable media, return -ENOTSUP.
* If it has no tray, return -ENOSYS.
* If the guest was asked to open the tray, return -EINPROGRESS.
* Else, return 0.
*/
static int do_open_tray(const char *blk_name, const char *qdev_id,
bool force, Error **errp)
{
BlockBackend *blk;
const char *device = qdev_id ?: blk_name;
bool locked;
blk = qmp_get_blk(blk_name, qdev_id, errp);
if (!blk) {
return -ENODEV;
}
if (!blk_dev_has_removable_media(blk)) {
error_setg(errp, "Device '%s' is not removable", device);
return -ENOTSUP;
}
if (!blk_dev_has_tray(blk)) {
error_setg(errp, "Device '%s' does not have a tray", device);
return -ENOSYS;
}
if (blk_dev_is_tray_open(blk)) {
return 0;
}
locked = blk_dev_is_medium_locked(blk);
if (locked) {
blk_dev_eject_request(blk, force);
}
if (!locked || force) {
blk_dev_change_media_cb(blk, false, &error_abort);
}
if (locked && !force) {
error_setg(errp, "Device '%s' is locked and force was not specified, "
"wait for tray to open and try again", device);
return -EINPROGRESS;
}
return 0;
}
void qmp_blockdev_open_tray(bool has_device, const char *device,
bool has_id, const char *id,
bool has_force, bool force,
Error **errp)
{
Error *local_err = NULL;
int rc;
if (!has_force) {
force = false;
}
rc = do_open_tray(has_device ? device : NULL,
has_id ? id : NULL,
force, &local_err);
if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
error_propagate(errp, local_err);
return;
}
error_free(local_err);
}
void qmp_blockdev_close_tray(bool has_device, const char *device,
bool has_id, const char *id,
Error **errp)
{
BlockBackend *blk;
Error *local_err = NULL;
device = has_device ? device : NULL;
id = has_id ? id : NULL;
blk = qmp_get_blk(device, id, errp);
if (!blk) {
return;
}
if (!blk_dev_has_removable_media(blk)) {
error_setg(errp, "Device '%s' is not removable", device ?: id);
return;
}
if (!blk_dev_has_tray(blk)) {
/* Ignore this command on tray-less devices */
return;
}
if (!blk_dev_is_tray_open(blk)) {
return;
}
blk_dev_change_media_cb(blk, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
void qmp_x_blockdev_remove_medium(bool has_device, const char *device,
bool has_id, const char *id, Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
bool has_attached_device;
device = has_device ? device : NULL;
id = has_id ? id : NULL;
blk = qmp_get_blk(device, id, errp);
if (!blk) {
return;
}
/* For BBs without a device, we can exchange the BDS tree at will */
has_attached_device = blk_get_attached_dev(blk);
if (has_attached_device && !blk_dev_has_removable_media(blk)) {
error_setg(errp, "Device '%s' is not removable", device ?: id);
return;
}
if (has_attached_device && blk_dev_has_tray(blk) &&
!blk_dev_is_tray_open(blk))
{
error_setg(errp, "Tray of device '%s' is not open", device ?: id);
return;
}
bs = blk_bs(blk);
if (!bs) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
goto out;
}
blk_remove_bs(blk);
if (!blk_dev_has_tray(blk)) {
/* For tray-less devices, blockdev-open-tray is a no-op (or may not be
* called at all); therefore, the medium needs to be ejected here.
* Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
* value passed here (i.e. false). */
blk_dev_change_media_cb(blk, false, &error_abort);
}
out:
aio_context_release(aio_context);
}
static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
BlockDriverState *bs, Error **errp)
{
Error *local_err = NULL;
bool has_device;
int ret;
/* For BBs without a device, we can exchange the BDS tree at will */
has_device = blk_get_attached_dev(blk);
if (has_device && !blk_dev_has_removable_media(blk)) {
error_setg(errp, "Device is not removable");
return;
}
if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
error_setg(errp, "Tray of the device is not open");
return;
}
if (blk_bs(blk)) {
error_setg(errp, "There already is a medium in the device");
return;
}
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
return;
}
if (!blk_dev_has_tray(blk)) {
/* For tray-less devices, blockdev-close-tray is a no-op (or may not be
* called at all); therefore, the medium needs to be pushed into the
* slot here.
* Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
* value passed here (i.e. true). */
blk_dev_change_media_cb(blk, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
blk_remove_bs(blk);
return;
}
}
}
void qmp_x_blockdev_insert_medium(bool has_device, const char *device,
bool has_id, const char *id,
const char *node_name, Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
blk = qmp_get_blk(has_device ? device : NULL,
has_id ? id : NULL,
errp);
if (!blk) {
return;
}
bs = bdrv_find_node(node_name);
if (!bs) {
error_setg(errp, "Node '%s' not found", node_name);
return;
}
if (bdrv_has_blk(bs)) {
error_setg(errp, "Node '%s' is already in use", node_name);
return;
}
qmp_blockdev_insert_anon_medium(blk, bs, errp);
}
void qmp_blockdev_change_medium(bool has_device, const char *device,
bool has_id, const char *id,
const char *filename,
bool has_format, const char *format,
bool has_read_only,
BlockdevChangeReadOnlyMode read_only,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *medium_bs = NULL;
int bdrv_flags;
bool detect_zeroes;
int rc;
QDict *options = NULL;
Error *err = NULL;
blk = qmp_get_blk(has_device ? device : NULL,
has_id ? id : NULL,
errp);
if (!blk) {
goto fail;
}
if (blk_bs(blk)) {
blk_update_root_state(blk);
}
bdrv_flags = blk_get_open_flags_from_root_state(blk);
bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
BDRV_O_PROTOCOL);
if (!has_read_only) {
read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
}
switch (read_only) {
case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
break;
case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
bdrv_flags &= ~BDRV_O_RDWR;
break;
case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
bdrv_flags |= BDRV_O_RDWR;
break;
default:
abort();
}
options = qdict_new();
detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
if (has_format) {
qdict_put_str(options, "driver", format);
}
medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
if (!medium_bs) {
goto fail;
}
rc = do_open_tray(has_device ? device : NULL,
has_id ? id : NULL,
false, &err);
if (rc && rc != -ENOSYS) {
error_propagate(errp, err);
goto fail;
}
error_free(err);
err = NULL;
qmp_x_blockdev_remove_medium(has_device, device, has_id, id, &err);
if (err) {
error_propagate(errp, err);
goto fail;
}
qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
if (err) {
error_propagate(errp, err);
goto fail;
}
qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
fail:
/* If the medium has been inserted, the device has its own reference, so
* ours must be relinquished; and if it has not been inserted successfully,
* the reference must be relinquished anyway */
bdrv_unref(medium_bs);
}
/* throttling disk I/O limits */
void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
{
ThrottleConfig cfg;
BlockDriverState *bs;
BlockBackend *blk;
AioContext *aio_context;
blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
arg->has_id ? arg->id : NULL,
errp);
if (!blk) {
return;
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
bs = blk_bs(blk);
if (!bs) {
error_setg(errp, "Device has no medium");
goto out;
}
throttle_config_init(&cfg);
cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
if (arg->has_bps_max) {
cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
}
if (arg->has_bps_rd_max) {
cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
}
if (arg->has_bps_wr_max) {
cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
}
if (arg->has_iops_max) {
cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
}
if (arg->has_iops_rd_max) {
cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
}
if (arg->has_iops_wr_max) {
cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
}
if (arg->has_bps_max_length) {
cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
}
if (arg->has_bps_rd_max_length) {
cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
}
if (arg->has_bps_wr_max_length) {
cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
}
if (arg->has_iops_max_length) {
cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
}
if (arg->has_iops_rd_max_length) {
cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
}
if (arg->has_iops_wr_max_length) {
cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
}
if (arg->has_iops_size) {
cfg.op_size = arg->iops_size;
}
if (!throttle_is_valid(&cfg, errp)) {
goto out;
}
if (throttle_enabled(&cfg)) {
/* Enable I/O limits if they're not enabled yet, otherwise
* just update the throttling group. */
if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
blk_io_limits_enable(blk,
arg->has_group ? arg->group :
arg->has_device ? arg->device :
arg->id);
} else if (arg->has_group) {
blk_io_limits_update_group(blk, arg->group);
}
/* Set the new throttling configuration */
blk_set_io_limits(blk, &cfg);
} else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
/* If all throttling settings are set to 0, disable I/O limits */
blk_io_limits_disable(blk);
}
out:
aio_context_release(aio_context);
}
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
bool has_granularity, uint32_t granularity,
bool has_persistent, bool persistent,
bool has_autoload, bool autoload,
Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
if (!name || name[0] == '\0') {
error_setg(errp, "Bitmap name cannot be empty");
return;
}
bs = bdrv_lookup_bs(node, node, errp);
if (!bs) {
return;
}
if (has_granularity) {
if (granularity < 512 || !is_power_of_2(granularity)) {
error_setg(errp, "Granularity must be power of 2 "
"and at least 512");
return;
}
} else {
/* Default to cluster size, if available: */
granularity = bdrv_get_default_bitmap_granularity(bs);
}
if (!has_persistent) {
persistent = false;
}
if (!has_autoload) {
autoload = false;
}
if (has_autoload && !persistent) {
error_setg(errp, "Autoload flag must be used only for persistent "
"bitmaps");
return;
}
if (persistent &&
!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
{
return;
}
bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
if (bitmap == NULL) {
return;
}
bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
bdrv_dirty_bitmap_set_autoload(bitmap, autoload);
}
void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
Error *local_err = NULL;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be removed",
name);
return;
}
if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return;
}
}
bdrv_dirty_bitmap_make_anon(bitmap);
bdrv_release_dirty_bitmap(bs, bitmap);
}
/**
* Completely clear a bitmap, for the purposes of synchronizing a bitmap
* immediately after a full backup operation.
*/
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
Error **errp)
{
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
if (!bitmap || !bs) {
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be modified",
name);
return;
} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently disabled and cannot be cleared",
name);
return;
} else if (bdrv_dirty_bitmap_readonly(bitmap)) {
error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
return;
}
bdrv_clear_dirty_bitmap(bitmap, NULL);
}
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 hmp_drive_del(Monitor *mon, const QDict *qdict)
{
const char *id = qdict_get_str(qdict, "id");
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
Error *local_err = NULL;
bs = bdrv_find_node(id);
if (bs) {
qmp_blockdev_del(id, &local_err);
if (local_err) {
error_report_err(local_err);
}
return;
}
blk = blk_by_name(id);
if (!blk) {
error_report("Device '%s' not found", id);
return;
}
if (!blk_legacy_dinfo(blk)) {
error_report("Deleting device added with blockdev-add"
" is not supported");
return;
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
bs = blk_bs(blk);
if (bs) {
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
error_report_err(local_err);
aio_context_release(aio_context);
return;
}
blk_remove_bs(blk);
}
/* Make the BlockBackend and the attached BlockDriverState anonymous */
monitor_remove_blk(blk);
/* If this BlockBackend has a device attached to it, its refcount will be
* decremented when the device is removed; otherwise we have to do so here.
*/
if (blk_get_attached_dev(blk)) {
/* Further I/O must not pause the guest */
blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
BLOCKDEV_ON_ERROR_REPORT);
} else {
blk_unref(blk);
}
aio_context_release(aio_context);
}
void qmp_block_resize(bool has_device, const char *device,
bool has_node_name, const char *node_name,
int64_t size, Error **errp)
{
Error *local_err = NULL;
BlockBackend *blk = NULL;
BlockDriverState *bs;
AioContext *aio_context;
int ret;
bs = bdrv_lookup_bs(has_device ? device : NULL,
has_node_name ? node_name : NULL,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!bdrv_is_first_non_filter(bs)) {
error_setg(errp, QERR_FEATURE_DISABLED, "resize");
goto out;
}
if (size < 0) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
goto out;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
error_setg(errp, QERR_DEVICE_IN_USE, device);
goto out;
}
blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
goto out;
}
bdrv_drained_begin(bs);
ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
bdrv_drained_end(bs);
out:
blk_unref(blk);
aio_context_release(aio_context);
}
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_speed, int64_t speed,
bool has_on_error, BlockdevOnError on_error,
Error **errp)
{
BlockDriverState *bs, *iter;
BlockDriverState *base_bs = NULL;
AioContext *aio_context;
Error *local_err = NULL;
const char *base_name = NULL;
if (!has_on_error) {
on_error = BLOCKDEV_ON_ERROR_REPORT;
}
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 && has_base_node) {
error_setg(errp, "'base' and 'base-node' cannot be specified "
"at the same time");
goto out;
}
if (has_base) {
base_bs = bdrv_find_backing_image(bs, base);
if (base_bs == NULL) {
error_setg(errp, QERR_BASE_NOT_FOUND, base);
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
base_name = base;
}
if (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);
base_name = base_bs->filename;
}
/* Check for op blockers in the whole chain between bs and base */
for (iter = bs; iter && iter != base_bs; iter = backing_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;
}
/* backing_file string overrides base bs filename */
base_name = has_backing_file ? backing_file : base_name;
stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
has_speed ? speed : 0, on_error, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
trace_qmp_block_stream(bs, bs->job);
out:
aio_context_release(aio_context);
}
void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
bool has_base, const char *base,
bool has_top, const char *top,
bool has_backing_file, const char *backing_file,
bool has_speed, int64_t speed,
bool has_filter_node_name, const char *filter_node_name,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *iter;
BlockDriverState *base_bs, *top_bs;
AioContext *aio_context;
Error *local_err = NULL;
/* This will be part of the QMP command, if/when the
* BlockdevOnError change for blkmirror makes it in
*/
BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
if (!has_speed) {
speed = 0;
}
if (!has_filter_node_name) {
filter_node_name = NULL;
}
/* 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 && top) {
if (strcmp(bs->filename, top) != 0) {
top_bs = bdrv_find_backing_image(bs, top);
}
}
if (top_bs == NULL) {
error_setg(errp, "Top image file %s not found", top ? top : "NULL");
goto out;
}
assert(bdrv_get_aio_context(top_bs) == aio_context);
if (has_base && base) {
base_bs = bdrv_find_backing_image(top_bs, base);
} else {
base_bs = bdrv_find_base(top_bs);
}
if (base_bs == NULL) {
error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_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;
}
if (top_bs == bs) {
if (has_backing_file) {
error_setg(errp, "'backing-file' specified,"
" but 'top' is the active layer");
goto out;
}
commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
BLOCK_JOB_DEFAULT, 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, 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);
}
static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
BlockJob *job = NULL;
BdrvDirtyBitmap *bmap = NULL;
AioContext *aio_context;
QDict *options = NULL;
Error *local_err = NULL;
int flags;
int64_t size;
bool set_backing_hd = false;
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_mode) {
backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
if (!backup->has_job_id) {
backup->job_id = NULL;
}
if (!backup->has_compress) {
backup->compress = false;
}
bs = qmp_get_root_bs(backup->device, errp);
if (!bs) {
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
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) {
source = backing_bs(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) {
bdrv_img_create(backup->target, backup->format, source->filename,
source->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;
}
if (backup->format) {
if (!options) {
options = qdict_new();
}
qdict_put_str(options, "driver", backup->format);
}
target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
if (!target_bs) {
goto out;
}
bdrv_set_aio_context(target_bs, aio_context);
if (set_backing_hd) {
bdrv_set_backing_hd(target_bs, source, &local_err);
if (local_err) {
bdrv_unref(target_bs);
goto out;
}
}
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);
bdrv_unref(target_bs);
goto out;
}
}
job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
backup->sync, bmap, backup->compress,
backup->on_source_error, backup->on_target_error,
BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
bdrv_unref(target_bs);
if (local_err != NULL) {
error_propagate(errp, local_err);
goto out;
}
out:
aio_context_release(aio_context);
return job;
}
void qmp_drive_backup(DriveBackup *arg, Error **errp)
{
BlockJob *job;
job = do_drive_backup(arg, NULL, errp);
if (job) {
block_job_start(job);
}
}
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
return bdrv_named_nodes_list(errp);
}
BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_bs;
Error *local_err = NULL;
AioContext *aio_context;
BlockJob *job = NULL;
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_compress) {
backup->compress = false;
}
bs = qmp_get_root_bs(backup->device, errp);
if (!bs) {
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
if (!target_bs) {
goto out;
}
if (bdrv_get_aio_context(target_bs) != aio_context) {
if (!bdrv_has_blk(target_bs)) {
/* The target BDS is not attached, we can safely move it to another
* AioContext. */
bdrv_set_aio_context(target_bs, aio_context);
} else {
error_setg(errp, "Target is attached to a different thread from "
"source.");
goto out;
}
}
job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
backup->sync, NULL, backup->compress,
backup->on_source_error, backup->on_target_error,
BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
}
out:
aio_context_release(aio_context);
return job;
}
void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
{
BlockJob *job;
job = do_blockdev_backup(arg, NULL, errp);
if (job) {
block_job_start(job);
}
}
/* 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 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,
Error **errp)
{
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 (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
"a value in range [512B, 64MB]");
return;
}
if (granularity & (granularity - 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
"power of 2");
return;
}
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 (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
/* 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,
speed, granularity, buf_size, sync, backing_mode,
on_source_error, on_target_error, unmap, filter_node_name,
errp);
}
void qmp_drive_mirror(DriveMirror *arg, Error **errp)
{
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
AioContext *aio_context;
BlockMirrorBackingMode backing_mode;
Error *local_err = NULL;
QDict *options = NULL;
int flags;
int64_t size;
const char *format = arg->format;
bs = qmp_get_root_bs(arg->device, errp);
if (!bs) {
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;
source = backing_bs(bs);
if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
arg->sync = MIRROR_SYNC_MODE_FULL;
}
if (arg->sync == MIRROR_SYNC_MODE_NONE) {
source = bs;
}
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
goto out;
}
if (arg->has_replaces) {
BlockDriverState *to_replace_bs;
AioContext *replace_aio_context;
int64_t replace_size;
if (!arg->has_node_name) {
error_setg(errp, "a node-name must be provided when replacing a"
" named node of the graph");
goto out;
}
to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
if (!to_replace_bs) {
error_propagate(errp, local_err);
goto out;
}
replace_aio_context = bdrv_get_aio_context(to_replace_bs);
aio_context_acquire(replace_aio_context);
replace_size = bdrv_getlength(to_replace_bs);
aio_context_release(replace_aio_context);
if (size != replace_size) {
error_setg(errp, "cannot replace image with a mirror image of "
"different size");
goto out;
}
}
if (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 || !source)
&& 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 {
switch (arg->mode) {
case NEW_IMAGE_MODE_EXISTING:
break;
case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
/* create new image with backing file */
bdrv_img_create(arg->target, format,
source->filename,
source->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;
}
bdrv_set_aio_context(target_bs, 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, 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,
&local_err);
bdrv_unref(target_bs);
error_propagate(errp, local_err);
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,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
Error *local_err = NULL;
bs = qmp_get_root_bs(device, errp);
if (!bs) {
return;
}
target_bs = bdrv_lookup_bs(target, target, errp);
if (!target_bs) {
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_set_aio_context(target_bs, aio_context);
blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
has_replaces, replaces, sync, backing_mode,
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,
&local_err);
error_propagate(errp, local_err);
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 (block_job_user_paused(job) && !force) {
error_setg(errp, "The block job for device '%s' is currently paused",
device);
goto out;
}
trace_qmp_block_job_cancel(job);
block_job_cancel(job);
out:
aio_context_release(aio_context);
}
void qmp_block_job_pause(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job || block_job_user_paused(job)) {
return;
}
trace_qmp_block_job_pause(job);
block_job_user_pause(job);
aio_context_release(aio_context);
}
void qmp_block_job_resume(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job || !block_job_user_paused(job)) {
return;
}
trace_qmp_block_job_resume(job);
block_job_user_resume(job);
aio_context_release(aio_context);
}
void qmp_block_job_complete(const char *device, Error **errp)
{
AioContext *aio_context;
BlockJob *job = find_block_job(device, &aio_context, errp);
if (!job) {
return;
}
trace_qmp_block_job_complete(job);
block_job_complete(job, errp);
aio_context_release(aio_context);
}
void qmp_change_backing_file(const char *device,
const char *image_node_name,
const char *backing_file,
Error **errp)
{
BlockDriverState *bs = NULL;
AioContext *aio_context;
BlockDriverState *image_bs = NULL;
Error *local_err = NULL;
bool ro;
int open_flags;
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 */
open_flags = image_bs->open_flags;
ro = bdrv_is_read_only(image_bs);
if (ro) {
bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
}
ret = bdrv_change_backing_file(image_bs, backing_file,
image_bs->drv ? image_bs->drv->format_name : "");
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
backing_file);
/* don't exit here, so we can try to restore open flags if
* appropriate */
}
if (ro) {
bdrv_reopen(image_bs, open_flags, &local_err);
error_propagate(errp, local_err);
}
out:
aio_context_release(aio_context);
}
void hmp_drive_add_node(Monitor *mon, const char *optstr)
{
QemuOpts *opts;
QDict *qdict;
Error *local_err = NULL;
opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
if (!opts) {
return;
}
qdict = qemu_opts_to_qdict(opts, NULL);
if (!qdict_get_try_str(qdict, "node-name")) {
QDECREF(qdict);
error_report("'node-name' needs to be specified");
goto out;
}
BlockDriverState *bs = bds_tree_init(qdict, &local_err);
if (!bs) {
error_report_err(local_err);
goto out;
}
QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
out:
qemu_opts_del(opts);
}
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
BlockDriverState *bs;
QObject *obj;
Visitor *v = qobject_output_visitor_new(&obj);
QDict *qdict;
const QDictEntry *ent;
Error *local_err = NULL;
visit_type_BlockdevOptions(v, NULL, &options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto fail;
}
visit_complete(v, &obj);
qdict = qobject_to_qdict(obj);
qdict_flatten(qdict);
/*
* Rewrite "backing": null to "backing": ""
* TODO Rewrite "" to null instead, and perhaps not even here
*/
for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) {
char *dot = strrchr(ent->key, '.');
if (!strcmp(dot ? dot + 1 : ent->key, "backing")
&& qobject_type(ent->value) == QTYPE_QNULL) {
qdict_put(qdict, ent->key, qstring_new());
}
}
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;
}
QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
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, "Cannot find node %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 (!bs->monitor_list.tqe_prev) {
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, **p_next = &head;
BlockJob *job;
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
BlockJobInfoList *elem;
AioContext *aio_context;
if (block_job_is_internal(job)) {
continue;
}
elem = g_new0(BlockJobInfoList, 1);
aio_context = blk_get_aio_context(job->blk);
aio_context_acquire(aio_context);
elem->value = block_job_query(job, errp);
aio_context_release(aio_context);
if (!elem->value) {
g_free(elem);
qapi_free_BlockJobInfoList(head);
return NULL;
}
*p_next = elem;
p_next = &elem->next;
}
return head;
}
QemuOptsList qemu_common_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
.desc = {
{
.name = "snapshot",
.type = QEMU_OPT_BOOL,
.help = "enable/disable snapshot mode",
},{
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
},{
.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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