vhdx: Support .bdrv_co_create

This adds the .bdrv_co_create driver callback to vhdx, which
enables image creation over QMP.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2018-03-09 19:53:19 +01:00
parent da23248f27
commit 09b68dab5a
2 changed files with 206 additions and 56 deletions

View File

@ -26,6 +26,9 @@
#include "block/vhdx.h"
#include "migration/blocker.h"
#include "qemu/uuid.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qapi-visit-block-core.h"
/* Options for VHDX creation */
@ -39,6 +42,8 @@ typedef enum VHDXImageType {
VHDX_TYPE_DIFFERENCING, /* Currently unsupported */
} VHDXImageType;
static QemuOptsList vhdx_create_opts;
/* Several metadata and region table data entries are identified by
* guids in a MS-specific GUID format. */
@ -1792,59 +1797,71 @@ exit:
* .---- ~ ----------- ~ ------------ ~ ---------------- ~ -----------.
* 1MB
*/
static int coroutine_fn vhdx_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
static int coroutine_fn vhdx_co_create(BlockdevCreateOptions *opts,
Error **errp)
{
BlockdevCreateOptionsVhdx *vhdx_opts;
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
int ret = 0;
uint64_t image_size = (uint64_t) 2 * GiB;
uint32_t log_size = 1 * MiB;
uint32_t block_size = 0;
uint64_t image_size;
uint32_t log_size;
uint32_t block_size;
uint64_t signature;
uint64_t metadata_offset;
bool use_zero_blocks = false;
gunichar2 *creator = NULL;
glong creator_items;
BlockBackend *blk;
char *type = NULL;
VHDXImageType image_type;
Error *local_err = NULL;
image_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
log_size = qemu_opt_get_size_del(opts, VHDX_BLOCK_OPT_LOG_SIZE, 0);
block_size = qemu_opt_get_size_del(opts, VHDX_BLOCK_OPT_BLOCK_SIZE, 0);
type = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
use_zero_blocks = qemu_opt_get_bool_del(opts, VHDX_BLOCK_OPT_ZERO, true);
assert(opts->driver == BLOCKDEV_DRIVER_VHDX);
vhdx_opts = &opts->u.vhdx;
/* Validate options and set default values */
image_size = vhdx_opts->size;
if (image_size > VHDX_MAX_IMAGE_SIZE) {
error_setg_errno(errp, EINVAL, "Image size too large; max of 64TB");
ret = -EINVAL;
goto exit;
return -EINVAL;
}
if (type == NULL) {
type = g_strdup("dynamic");
}
if (!strcmp(type, "dynamic")) {
image_type = VHDX_TYPE_DYNAMIC;
} else if (!strcmp(type, "fixed")) {
image_type = VHDX_TYPE_FIXED;
} else if (!strcmp(type, "differencing")) {
error_setg_errno(errp, ENOTSUP,
"Differencing files not yet supported");
ret = -ENOTSUP;
goto exit;
if (!vhdx_opts->has_log_size) {
log_size = DEFAULT_LOG_SIZE;
} else {
error_setg(errp, "Invalid subformat '%s'", type);
ret = -EINVAL;
goto exit;
log_size = vhdx_opts->log_size;
}
if (log_size < MiB || (log_size % MiB) != 0) {
error_setg_errno(errp, EINVAL, "Log size must be a multiple of 1 MB");
return -EINVAL;
}
if (!vhdx_opts->has_block_state_zero) {
use_zero_blocks = true;
} else {
use_zero_blocks = vhdx_opts->block_state_zero;
}
if (!vhdx_opts->has_subformat) {
vhdx_opts->subformat = BLOCKDEV_VHDX_SUBFORMAT_DYNAMIC;
}
switch (vhdx_opts->subformat) {
case BLOCKDEV_VHDX_SUBFORMAT_DYNAMIC:
image_type = VHDX_TYPE_DYNAMIC;
break;
case BLOCKDEV_VHDX_SUBFORMAT_FIXED:
image_type = VHDX_TYPE_FIXED;
break;
default:
g_assert_not_reached();
}
/* These are pretty arbitrary, and mainly designed to keep the BAT
* size reasonable to load into RAM */
if (block_size == 0) {
if (vhdx_opts->has_block_size) {
block_size = vhdx_opts->block_size;
} else {
if (image_size > 32 * TiB) {
block_size = 64 * MiB;
} else if (image_size > (uint64_t) 100 * GiB) {
@ -1856,30 +1873,27 @@ static int coroutine_fn vhdx_co_create_opts(const char *filename, QemuOpts *opts
}
}
if (block_size < MiB || (block_size % MiB) != 0) {
error_setg_errno(errp, EINVAL, "Block size must be a multiple of 1 MB");
return -EINVAL;
}
if (block_size > VHDX_BLOCK_SIZE_MAX) {
error_setg_errno(errp, EINVAL, "Block size must not exceed %d",
VHDX_BLOCK_SIZE_MAX);
return -EINVAL;
}
/* make the log size close to what was specified, but must be
* min 1MB, and multiple of 1MB */
log_size = ROUND_UP(log_size, MiB);
/* Create BlockBackend to write to the image */
bs = bdrv_open_blockdev_ref(vhdx_opts->file, errp);
if (bs == NULL) {
return -EIO;
}
block_size = ROUND_UP(block_size, MiB);
block_size = block_size > VHDX_BLOCK_SIZE_MAX ? VHDX_BLOCK_SIZE_MAX :
block_size;
ret = bdrv_create_file(filename, opts, &local_err);
blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
error_propagate(errp, local_err);
goto exit;
goto delete_and_exit;
}
blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
&local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
ret = -EIO;
goto exit;
}
blk_set_allow_write_beyond_eof(blk, true);
/* Create (A) */
@ -1931,12 +1945,109 @@ static int coroutine_fn vhdx_co_create_opts(const char *filename, QemuOpts *opts
delete_and_exit:
blk_unref(blk);
exit:
g_free(type);
bdrv_unref(bs);
g_free(creator);
return ret;
}
static int coroutine_fn vhdx_co_create_opts(const char *filename,
QemuOpts *opts,
Error **errp)
{
BlockdevCreateOptions *create_options = NULL;
QDict *qdict = NULL;
QObject *qobj;
Visitor *v;
BlockDriverState *bs = NULL;
Error *local_err = NULL;
int ret;
static const QDictRenames opt_renames[] = {
{ VHDX_BLOCK_OPT_LOG_SIZE, "log-size" },
{ VHDX_BLOCK_OPT_BLOCK_SIZE, "block-size" },
{ VHDX_BLOCK_OPT_ZERO, "block-state-zero" },
{ NULL, NULL },
};
/* Parse options and convert legacy syntax */
qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vhdx_create_opts, true);
if (!qdict_rename_keys(qdict, opt_renames, errp)) {
ret = -EINVAL;
goto fail;
}
/* Create and open the file (protocol layer) */
ret = bdrv_create_file(filename, opts, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto fail;
}
bs = bdrv_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
if (bs == NULL) {
ret = -EIO;
goto fail;
}
/* Now get the QAPI type BlockdevCreateOptions */
qdict_put_str(qdict, "driver", "vhdx");
qdict_put_str(qdict, "file", bs->node_name);
qobj = qdict_crumple(qdict, errp);
QDECREF(qdict);
qdict = qobject_to_qdict(qobj);
if (qdict == NULL) {
ret = -EINVAL;
goto fail;
}
v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
visit_free(v);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto fail;
}
/* Silently round up sizes:
* The image size is rounded to 512 bytes. Make the block and log size
* close to what was specified, but must be at least 1MB, and a multiple of
* 1 MB. Also respect VHDX_BLOCK_SIZE_MAX for block sizes. block_size = 0
* means auto, which is represented by a missing key in QAPI. */
assert(create_options->driver == BLOCKDEV_DRIVER_VHDX);
create_options->u.vhdx.size =
ROUND_UP(create_options->u.vhdx.size, BDRV_SECTOR_SIZE);
if (create_options->u.vhdx.has_log_size) {
create_options->u.vhdx.log_size =
ROUND_UP(create_options->u.vhdx.log_size, MiB);
}
if (create_options->u.vhdx.has_block_size) {
create_options->u.vhdx.block_size =
ROUND_UP(create_options->u.vhdx.block_size, MiB);
if (create_options->u.vhdx.block_size == 0) {
create_options->u.vhdx.has_block_size = false;
}
if (create_options->u.vhdx.block_size > VHDX_BLOCK_SIZE_MAX) {
create_options->u.vhdx.block_size = VHDX_BLOCK_SIZE_MAX;
}
}
/* Create the vhdx image (format layer) */
ret = vhdx_co_create(create_options, errp);
fail:
QDECREF(qdict);
bdrv_unref(bs);
qapi_free_BlockdevCreateOptions(create_options);
return ret;
}
/* If opened r/w, the VHDX driver will automatically replay the log,
* if one is present, inside the vhdx_open() call.
*
@ -2005,6 +2116,7 @@ static BlockDriver bdrv_vhdx = {
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_co_readv = vhdx_co_readv,
.bdrv_co_writev = vhdx_co_writev,
.bdrv_co_create = vhdx_co_create,
.bdrv_co_create_opts = vhdx_co_create_opts,
.bdrv_get_info = vhdx_get_info,
.bdrv_co_check = vhdx_co_check,

View File

@ -3844,6 +3844,44 @@
'size': 'size',
'*static': 'bool' } }
##
# @BlockdevVhdxSubformat:
#
# @dynamic: Growing image file
# @fixed: Preallocated fixed-size image file
#
# Since: 2.12
##
{ 'enum': 'BlockdevVhdxSubformat',
'data': [ 'dynamic', 'fixed' ] }
##
# @BlockdevCreateOptionsVhdx:
#
# Driver specific image creation options for vhdx.
#
# @file Node to create the image format on
# @size Size of the virtual disk in bytes
# @log-size Log size in bytes, must be a multiple of 1 MB
# (default: 1 MB)
# @block-size Block size in bytes, must be a multiple of 1 MB and not
# larger than 256 MB (default: automatically choose a block
# size depending on the image size)
# @subformat vhdx subformat (default: dynamic)
# @block-state-zero Force use of payload blocks of type 'ZERO'. Non-standard,
# but default. Do not set to 'off' when using 'qemu-img
# convert' with subformat=dynamic.
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsVhdx',
'data': { 'file': 'BlockdevRef',
'size': 'size',
'*log-size': 'size',
'*block-size': 'size',
'*subformat': 'BlockdevVhdxSubformat',
'*block-state-zero': 'bool' } }
##
# @BlockdevCreateNotSupported:
#
@ -3899,7 +3937,7 @@
'ssh': 'BlockdevCreateOptionsSsh',
'throttle': 'BlockdevCreateNotSupported',
'vdi': 'BlockdevCreateOptionsVdi',
'vhdx': 'BlockdevCreateNotSupported',
'vhdx': 'BlockdevCreateOptionsVhdx',
'vmdk': 'BlockdevCreateNotSupported',
'vpc': 'BlockdevCreateNotSupported',
'vvfat': 'BlockdevCreateNotSupported',