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Support for Bochs "growing" images, by Volker Ruppert.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2296 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-01-05 18:56:04 +00:00
parent b92090309e
commit 6850dd945e
1 changed files with 35 additions and 5 deletions
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38
block-bochs.c
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@ -28,7 +28,8 @@
/**************************************************************/
#define HEADER_MAGIC "Bochs Virtual HD Image"
#define HEADER_VERSION 0x00010000
#define HEADER_VERSION 0x00020000
#define HEADER_V1 0x00010000
#define HEADER_SIZE 512
#define REDOLOG_TYPE "Redolog"
@ -36,6 +37,26 @@
// not allocated: 0xffffffff
// always little-endian
struct bochs_header_v1 {
char magic[32]; // "Bochs Virtual HD Image"
char type[16]; // "Redolog"
char subtype[16]; // "Undoable" / "Volatile" / "Growing"
uint32_t version;
uint32_t header; // size of header
union {
struct {
uint32_t catalog; // num of entries
uint32_t bitmap; // bitmap size
uint32_t extent; // extent size
uint64_t disk; // disk size
char padding[HEADER_SIZE - 64 - 8 - 20];
} redolog;
char padding[HEADER_SIZE - 64 - 8];
} extra;
};
// always little-endian
struct bochs_header {
char magic[32]; // "Bochs Virtual HD Image"
@ -49,8 +70,9 @@ struct bochs_header {
uint32_t catalog; // num of entries
uint32_t bitmap; // bitmap size
uint32_t extent; // extent size
uint32_t reserved; // for ???
uint64_t disk; // disk size
char padding[HEADER_SIZE - 64 - 8 - 20];
char padding[HEADER_SIZE - 64 - 8 - 24];
} redolog;
char padding[HEADER_SIZE - 64 - 8];
} extra;
@ -79,7 +101,8 @@ static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
if (!strcmp(bochs->magic, HEADER_MAGIC) &&
!strcmp(bochs->type, REDOLOG_TYPE) &&
!strcmp(bochs->subtype, GROWING_TYPE) &&
(le32_to_cpu(bochs->version) == HEADER_VERSION))
((le32_to_cpu(bochs->version) == HEADER_VERSION) ||
(le32_to_cpu(bochs->version) == HEADER_V1)))
return 100;
return 0;
@ -90,6 +113,7 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
BDRVBochsState *s = bs->opaque;
int fd, i;
struct bochs_header bochs;
struct bochs_header_v1 header_v1;
fd = open(filename, O_RDWR | O_BINARY);
if (fd < 0) {
@ -109,11 +133,17 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
if (strcmp(bochs.magic, HEADER_MAGIC) ||
strcmp(bochs.type, REDOLOG_TYPE) ||
strcmp(bochs.subtype, GROWING_TYPE) ||
(le32_to_cpu(bochs.version) != HEADER_VERSION)) {
((le32_to_cpu(bochs.version) != HEADER_VERSION) &&
(le32_to_cpu(bochs.version) != HEADER_V1))) {
goto fail;
}
if (le32_to_cpu(bochs.version) == HEADER_V1) {
memcpy(&header_v1, &bochs, sizeof(bochs));
bs->total_sectors = le64_to_cpu(header_v1.extra.redolog.disk) / 512;
} else {
bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
}
lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET);