/*
* Block driver for the various disk image formats used by Bochs
* Currently only for "growing" type in read-only mode
- *
+ *
* Copyright (c) 2005 Alex Beregszaszi
- *
+ *
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include "vl.h"
+#include "qemu-common.h"
#include "block_int.h"
/**************************************************************/
#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"
// not allocated: 0xffffffff
// always little-endian
-struct bochs_header {
+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
} extra;
};
+// always little-endian
+struct bochs_header {
+ 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
+ uint32_t reserved; // for ???
+ uint64_t disk; // disk size
+ char padding[HEADER_SIZE - 64 - 8 - 24];
+ } redolog;
+ char padding[HEADER_SIZE - 64 - 8];
+ } extra;
+};
+
typedef struct BDRVBochsState {
int fd;
uint32_t *catalog_bitmap;
int catalog_size;
-
+
int data_offset;
-
+
int bitmap_blocks;
int extent_blocks;
int extent_size;
static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const struct bochs_header *bochs = (const void *)buf;
-
+
if (buf_size < HEADER_SIZE)
return 0;
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;
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) {
if (fd < 0)
return -1;
}
-
+
bs->read_only = 1; // no write support yet
-
+
s->fd = fd;
if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) {
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;
}
- bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
+ 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);
s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog);
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
- if (!s->catalog_bitmap)
- goto fail;
if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) !=
s->catalog_size * 4)
goto fail;
s->bitmap_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.bitmap) - 1) / 512;
s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512;
-
+
s->extent_size = le32_to_cpu(bochs.extra.redolog.extent);
return 0;
// seek to sector
extent_index = offset / s->extent_size;
extent_offset = (offset % s->extent_size) / 512;
-
+
if (s->catalog_bitmap[extent_index] == 0xffffffff)
{
// fprintf(stderr, "page not allocated [%x - %x:%x]\n",
bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] *
(s->extent_blocks + s->bitmap_blocks));
block_offset = bitmap_offset + (512 * (s->bitmap_blocks + extent_offset));
-
+
// fprintf(stderr, "sect: %x [ext i: %x o: %x] -> %x bitmap: %x block: %x\n",
// sector_num, extent_index, extent_offset,
// le32_to_cpu(s->catalog_bitmap[extent_index]),
// bitmap_offset, block_offset);
-
+
// read in bitmap for current extent
lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET);
-
+
read(s->fd, &bitmap_entry, 1);
-
+
if (!((bitmap_entry >> (extent_offset % 8)) & 1))
{
// fprintf(stderr, "sector (%x) in bitmap not allocated\n",
}
lseek(s->fd, block_offset, SEEK_SET);
-
+
return 0;
}
-static int bochs_read(BlockDriverState *bs, int64_t sector_num,
+static int bochs_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVBochsState *s = bs->opaque;
}
BlockDriver bdrv_bochs = {
- "bochs",
- sizeof(BDRVBochsState),
- bochs_probe,
- bochs_open,
- bochs_read,
- NULL,
- bochs_close,
+ .format_name = "bochs",
+ .instance_size = sizeof(BDRVBochsState),
+ .bdrv_probe = bochs_probe,
+ .bdrv_open = bochs_open,
+ .bdrv_read = bochs_read,
+ .bdrv_close = bochs_close,
};
projects / qemu / blobdiff