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blockdev.c
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4089 lines (3507 loc) · 119 KB
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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 "qapi/util.h"
#include "sysemu/sysemu.h"
#include "block/block_int.h"
#include "qmp-commands.h"
#include "block/trace.h"
#include "sysemu/arch_init.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_QINT: {
int64_t length = qint_get_int(qobject_to_qint(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__MAX,
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;
if (bdrv_key_required(bs)) {
autostart = 0;
}
block_acct_init(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;
/* 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");
}
/* 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) {
error_report("warning: 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++;
}
}