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[Qemu-devel] [PATCH v6 05/12] VMDK: add field BDRVVmdkState.desc_offset
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v6 05/12] VMDK: add field BDRVVmdkState.desc_offset |
Date: |
Fri, 1 Jul 2011 12:55:35 +0800 |
There are several occurrence of magic number 0x200 as the descriptor
offset within mono sparse image file. This is not the case for images
with separate descriptor file. So a field is added to BDRVVmdkState to
hold the correct value.
Signed-off-by: Fam Zheng <address@hidden>
---
block/vmdk.c | 26 ++++++++++++++++----------
1 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index 03248f3..9393ff9 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -81,6 +81,7 @@ typedef struct VmdkExtent {
} VmdkExtent;
typedef struct BDRVVmdkState {
+ int desc_offset;
int num_extents;
uint32_t parent_cid;
VmdkExtent *extents;
@@ -173,10 +174,11 @@ static uint32_t vmdk_read_cid(BlockDriverState *bs, int
parent)
uint32_t cid;
const char *p_name, *cid_str;
size_t cid_str_size;
+ BDRVVmdkState *s = bs->opaque;
- /* the descriptor offset = 0x200 */
- if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
+ if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
return 0;
+ }
if (parent) {
cid_str = "parentCID";
@@ -198,10 +200,11 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t
cid)
{
char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
char *p_name, *tmp_str;
+ BDRVVmdkState *s = bs->opaque;
- /* the descriptor offset = 0x200 */
- if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
- return -1;
+ if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
+ return -EIO;
+ }
tmp_str = strstr(desc,"parentCID");
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
@@ -211,8 +214,9 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t
cid)
pstrcat(desc, sizeof(desc), tmp_desc);
}
- if (bdrv_pwrite_sync(bs->file, 0x200, desc, DESC_SIZE) < 0)
- return -1;
+ if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) {
+ return -EIO;
+ }
return 0;
}
@@ -296,7 +300,6 @@ static int vmdk_snapshot_create(const char *filename, const
char *backing_file)
ret = -errno;
goto fail;
}
- /* the descriptor offset = 0x200 */
if (lseek(p_fd, 0x200, SEEK_SET) == -1) {
ret = -errno;
goto fail;
@@ -400,10 +403,11 @@ static int vmdk_parent_open(BlockDriverState *bs)
{
char *p_name;
char desc[DESC_SIZE];
+ BDRVVmdkState *s = bs->opaque;
- /* the descriptor offset = 0x200 */
- if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
+ if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
return -1;
+ }
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) {
char *end_name;
@@ -531,6 +535,7 @@ static int vmdk_open_vmdk3(BlockDriverState *bs, int flags)
VmdkExtent *extent;
BDRVVmdkState *s = bs->opaque;
+ s->desc_offset = 0x200;
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header));
if (ret != sizeof(header)) {
ret = ret < 0 ? ret : -EIO;
@@ -561,6 +566,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs, int flags)
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent;
+ s->desc_offset = 0x200;
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header));
if (ret != sizeof(header)) {
ret = ret < 0 ? ret : -EIO;
- [Qemu-devel] [PATCH v6 00/12] Adding VMDK monolithic flat support, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 05/12] VMDK: add field BDRVVmdkState.desc_offset,
Fam Zheng <=
- [Qemu-devel] [PATCH v6 06/12] VMDK: flush multiple extents, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 07/12] VMDK: move 'static' cid_update flag to bs field, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 08/12] VMDK: change get_cluster_offset return type, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 09/12] VMDK: open/read/write for monolithicFlat image, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 10/12] VMDK: create different subformats, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 11/12] VMDK: fix coding style, Fam Zheng, 2011/07/01
- [Qemu-devel] [PATCH v6 12/12] block: add bdrv_get_allocated_file_size() operation, Fam Zheng, 2011/07/01