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vmdk: push vmdk_read_desc up to caller 

Currently, we just try reading a VMDK file as both image and descriptor.
This makes it hard to choose which of the two attempts gave the best error.
We'll decide in advance if the file looks like an image or a descriptor,
and this patch is the first step to that end.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-02-17 14:44:03 +01:00 committed by Kevin Wolf
parent a8842e6d2a
commit d1833ef52b
1 changed files with 31 additions and 24 deletions
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55
block/vmdk.c
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@ -526,8 +526,8 @@ static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
return ret;
}
static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
uint64_t desc_offset, Error **errp);
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
Error **errp);
static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset,
Error **errp)
@ -576,7 +576,13 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
if (header.capacity == 0) {
uint64_t desc_offset = le64_to_cpu(header.desc_offset);
if (desc_offset) {
return vmdk_open_desc_file(bs, flags, desc_offset << 9, errp);
char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
if (!buf) {
return -EINVAL;
}
ret = vmdk_open_desc_file(bs, flags, buf, errp);
g_free(buf);
return ret;
}
}
@ -727,16 +733,12 @@ static int vmdk_parse_description(const char *desc, const char *opt_name,
/* Open an extent file and append to bs array */
static int vmdk_open_sparse(BlockDriverState *bs,
BlockDriverState *file,
int flags, Error **errp)
BlockDriverState *file, int flags,
char *buf, Error **errp)
{
uint32_t magic;
if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) {
return -EIO;
}
magic = be32_to_cpu(magic);
magic = ldl_be_p(buf);
switch (magic) {
case VMDK3_MAGIC:
return vmdk_open_vmfs_sparse(bs, file, flags, errp);
@ -821,8 +823,14 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
extent->flat_start_offset = flat_offset << 9;
} else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
/* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, errp);
char *buf = vmdk_read_desc(extent_file, 0, errp);
if (!buf) {
ret = -EINVAL;
} else {
ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, errp);
}
if (ret) {
g_free(buf);
bdrv_unref(extent_file);
return ret;
}
@ -845,20 +853,13 @@ next_line:
return 0;
}
static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
uint64_t desc_offset, Error **errp)
static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
Error **errp)
{
int ret;
char *buf;
char ct[128];
BDRVVmdkState *s = bs->opaque;
buf = vmdk_read_desc(bs->file, desc_offset, errp);
if (!buf) {
return -EINVAL;
goto exit;
}
if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
ret = -EMEDIUMTYPE;
goto exit;
@ -876,20 +877,25 @@ static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
s->desc_offset = 0;
ret = vmdk_parse_extents(buf, bs, bs->file->filename, errp);
exit:
g_free(buf);
return ret;
}
static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
char *buf = NULL;
int ret;
BDRVVmdkState *s = bs->opaque;
if (vmdk_open_sparse(bs, bs->file, flags, errp) == 0) {
buf = vmdk_read_desc(bs->file, 0, errp);
if (!buf) {
return -EINVAL;
}
if (vmdk_open_sparse(bs, bs->file, flags, buf, errp) == 0) {
s->desc_offset = 0x200;
} else {
ret = vmdk_open_desc_file(bs, flags, 0, errp);
ret = vmdk_open_desc_file(bs, flags, buf, errp);
if (ret) {
goto fail;
}
@ -908,10 +914,11 @@ static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
"vmdk", bs->device_name, "live migration");
migrate_add_blocker(s->migration_blocker);
g_free(buf);
return 0;
fail:
g_free(buf);
g_free(s->create_type);
s->create_type = NULL;
vmdk_free_extents(bs);