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block/parallels: support parallels image creation

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Do not even care to create WithoutFreeSpace image, it is obsolete.
Always create WithouFreSpacExt one.

The code also does not spend a lot of efforts to fill cylinders and
heads fields, they are not used actually in a real life neither in
QEMU nor in Parallels products.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Roman Kagan <rkagan@parallels.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Roman Kagan <rkagan@parallels.com>
Message-id: 1430207220-24458-12-git-send-email-den@openvz.org
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-04-28 10:46:44 +03:00 committed by Stefan Hajnoczi
parent 50ffd8fd3c
commit 74cf6c5026
1 changed files with 97 additions and 0 deletions
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97
block/parallels.c
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@ -33,6 +33,9 @@
#define HEADER_MAGIC2 "WithouFreSpacExt"
#define HEADER_VERSION 2
#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
// always little-endian
typedef struct ParallelsHeader {
char magic[16]; // "WithoutFreeSpace"
@ -317,12 +320,103 @@ static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
return ret;
}
static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
{
int64_t total_size, cl_size;
uint8_t tmp[BDRV_SECTOR_SIZE];
Error *local_err = NULL;
BlockDriverState *file;
uint32_t cat_entries, cat_sectors;
ParallelsHeader header;
int ret;
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
ret = bdrv_create_file(filename, opts, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return ret;
}
file = NULL;
ret = bdrv_open(&file, filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return ret;
}
ret = bdrv_truncate(file, 0);
if (ret < 0) {
goto exit;
}
cat_entries = DIV_ROUND_UP(total_size, cl_size);
cat_sectors = DIV_ROUND_UP(cat_entries * sizeof(uint32_t) +
sizeof(ParallelsHeader), cl_size);
cat_sectors = (cat_sectors * cl_size) >> BDRV_SECTOR_BITS;
memset(&header, 0, sizeof(header));
memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
header.version = cpu_to_le32(HEADER_VERSION);
/* don't care much about geometry, it is not used on image level */
header.heads = cpu_to_le32(16);
header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
header.catalog_entries = cpu_to_le32(cat_entries);
header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
header.data_off = cpu_to_le32(cat_sectors);
/* write all the data */
memset(tmp, 0, sizeof(tmp));
memcpy(tmp, &header, sizeof(header));
ret = bdrv_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE);
if (ret < 0) {
goto exit;
}
ret = bdrv_write_zeroes(file, 1, cat_sectors - 1, 0);
if (ret < 0) {
goto exit;
}
ret = 0;
done:
bdrv_unref(file);
return ret;
exit:
error_setg_errno(errp, -ret, "Failed to create Parallels image");
goto done;
}
static void parallels_close(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
g_free(s->catalog_bitmap);
}
static QemuOptsList parallels_create_opts = {
.name = "parallels-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
.desc = {
{
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size",
},
{
.name = BLOCK_OPT_CLUSTER_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Parallels image cluster size",
.def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
},
{ /* end of list */ }
}
};
static BlockDriver bdrv_parallels = {
.format_name = "parallels",
.instance_size = sizeof(BDRVParallelsState),
@ -333,6 +427,9 @@ static BlockDriver bdrv_parallels = {
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_readv = parallels_co_readv,
.bdrv_co_writev = parallels_co_writev,
.bdrv_create = parallels_create,
.create_opts = &parallels_create_opts,
};
static void bdrv_parallels_init(void)