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[Qemu-devel] [PATCH 16/20] vmdk: push vmdk_read_desc up to caller
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 16/20] vmdk: push vmdk_read_desc up to caller |
Date: |
Sun, 9 Feb 2014 10:48:51 +0100 |
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 <address@hidden>
---
block/vmdk.c | 54 ++++++++++++++++++++++++++++++------------------------
1 file changed, 30 insertions(+), 24 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index 58f4c34..74a0bac 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -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)
@@ -575,7 +575,13 @@ 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;
}
}
@@ -726,16 +732,12 @@ 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);
@@ -819,7 +821,12 @@ 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) {
bdrv_unref(extent_file);
return ret;
@@ -843,20 +850,13 @@ 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;
@@ -874,20 +874,25 @@ 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;
}
@@ -906,10 +911,11 @@ 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);
--
1.8.5.3
- Re: [Qemu-devel] [PATCH 10/20] curl: correctly propagate errors, (continued)
- [Qemu-devel] [PATCH 11/20] qcow: correctly propagate errors, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 12/20] qed: correctly propagate errors, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 13/20] vhdx: correctly propagate errors, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 15/20] vmdk: extract vmdk_read_desc, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 16/20] vmdk: push vmdk_read_desc up to caller,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 17/20] vmdk: do not try opening a file as both image and descriptor, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 19/20] block: do not abuse EMEDIUMTYPE, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 20/20] vdi: say why an image is bad, Paolo Bonzini, 2014/02/09
- [Qemu-devel] [PATCH 14/20] vvfat: correctly propagate errors, Paolo Bonzini, 2014/02/09