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VMDK: creating streamOptimized subformat

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Creating streamOptimized subformat. Added subformat option
'streamOptimized', to create a image with compression enabled and each
cluster with a GrainMarker.

Signed-off-by: Fam Zheng <famcool@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2011-08-12 23:19:32 +08:00 committed by Kevin Wolf
parent 2b2c8c5dec
commit 6c031aac4d
1 changed files with 12 additions and 6 deletions
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18
block/vmdk.c
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@ -1090,7 +1090,8 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
}
static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
static int vmdk_create_extent(const char *filename, int64_t filesize,
bool flat, bool compress)
{
int ret, i;
int fd = 0;
@ -1114,7 +1115,9 @@ static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
magic = cpu_to_be32(VMDK4_MAGIC);
memset(&header, 0, sizeof(header));
header.version = 1;
header.flags = 3; /* ?? */
header.flags =
3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0);
header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0;
header.capacity = filesize / 512;
header.granularity = 128;
header.num_gtes_per_gte = 512;
@ -1144,6 +1147,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize, bool flat)
header.rgd_offset = cpu_to_le64(header.rgd_offset);
header.gd_offset = cpu_to_le64(header.gd_offset);
header.grain_offset = cpu_to_le64(header.grain_offset);
header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm);
header.check_bytes[0] = 0xa;
header.check_bytes[1] = 0x20;
@ -1285,7 +1289,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
const char *fmt = NULL;
int flags = 0;
int ret = 0;
bool flat, split;
bool flat, split, compress;
char ext_desc_lines[BUF_SIZE] = "";
char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX];
const int64_t split_size = 0x80000000; /* VMDK has constant split size */
@ -1334,7 +1338,8 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
} else if (strcmp(fmt, "monolithicFlat") &&
strcmp(fmt, "monolithicSparse") &&
strcmp(fmt, "twoGbMaxExtentSparse") &&
strcmp(fmt, "twoGbMaxExtentFlat")) {
strcmp(fmt, "twoGbMaxExtentFlat") &&
strcmp(fmt, "streamOptimized")) {
fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt);
return -EINVAL;
}
@ -1342,6 +1347,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
strcmp(fmt, "twoGbMaxExtentSparse"));
flat = !(strcmp(fmt, "monolithicFlat") &&
strcmp(fmt, "twoGbMaxExtentFlat"));
compress = !strcmp(fmt, "streamOptimized");
if (flat) {
desc_extent_line = "RW %lld FLAT \"%s\" 0\n";
} else {
@ -1396,7 +1402,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options)
snprintf(ext_filename, sizeof(ext_filename), "%s%s",
path, desc_filename);
if (vmdk_create_extent(ext_filename, size, flat)) {
if (vmdk_create_extent(ext_filename, size, flat, compress)) {
return -EINVAL;
}
filesize -= size;
@ -1510,7 +1516,7 @@ static QEMUOptionParameter vmdk_create_options[] = {
.type = OPT_STRING,
.help =
"VMDK flat extent format, can be one of "
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat} "
"{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} "
},
{ NULL }
};