[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 6/6] VMDK: creating streamOptimized subformat
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v2 6/6] VMDK: creating streamOptimized subformat |
Date: |
Thu, 4 Aug 2011 11:09:21 +0800 |
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 <address@hidden>
---
block/vmdk.c | 18 ++++++++++++------
1 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index da34b9d..ff83f8c 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1089,7 +1089,8 @@ 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;
@@ -1113,7 +1114,9 @@ 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;
@@ -1143,6 +1146,7 @@ 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;
@@ -1284,7 +1288,7 @@ 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 */
@@ -1333,7 +1337,8 @@ 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;
}
@@ -1341,6 +1346,7 @@ 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 {
@@ -1395,7 +1401,7 @@ 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;
@@ -1509,7 +1515,7 @@ 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 }
};