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bochs: use qemu block API 

Use bdrv_pwrite to access the backing device instead of pread, and
convert the driver to implementing the bdrv_open method which gives
it an already opened BlockDriverState for the underlying device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2010-05-04 12:44:21 +02:00 committed by Kevin Wolf
parent efbca10f10
commit 7a6f391376
1 changed files with 9 additions and 21 deletions
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30
block/bochs.c
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@ -80,8 +80,6 @@ struct bochs_header {
};
typedef struct BDRVBochsState {
int fd;
uint32_t *catalog_bitmap;
int catalog_size;
@ -109,23 +107,16 @@ static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
return 0;
}
static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
static int bochs_open(BlockDriverState *bs, int flags)
{
BDRVBochsState *s = bs->opaque;
int fd, i;
int i;
struct bochs_header bochs;
struct bochs_header_v1 header_v1;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
return -1;
}
bs->read_only = 1; // no write support yet
s->fd = fd;
if (pread(fd, &bochs, sizeof(bochs), 0) != sizeof(bochs)) {
if (bdrv_pread(bs->file, 0, &bochs, sizeof(bochs)) != sizeof(bochs)) {
goto fail;
}
@ -146,8 +137,8 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog);
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
if (pread(s->fd, s->catalog_bitmap, s->catalog_size * 4,
le32_to_cpu(bochs.header)) != s->catalog_size * 4)
if (bdrv_pread(bs->file, le32_to_cpu(bochs.header), s->catalog_bitmap,
s->catalog_size * 4) != s->catalog_size * 4)
goto fail;
for (i = 0; i < s->catalog_size; i++)
le32_to_cpus(&s->catalog_bitmap[i]);
@ -161,7 +152,6 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
return 0;
fail:
close(fd);
return -1;
}
@ -184,8 +174,8 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
(s->extent_blocks + s->bitmap_blocks));
/* read in bitmap for current extent */
if (pread(s->fd, &bitmap_entry, 1, bitmap_offset + (extent_offset / 8))
!= 1) {
if (bdrv_pread(bs->file, bitmap_offset + (extent_offset / 8),
&bitmap_entry, 1) != 1) {
return -1;
}
@ -199,13 +189,12 @@ static int64_t seek_to_sector(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;
int ret;
while (nb_sectors > 0) {
int64_t block_offset = seek_to_sector(bs, sector_num);
if (block_offset >= 0) {
ret = pread(s->fd, buf, 512, block_offset);
ret = bdrv_pread(bs->file, block_offset, buf, 512);
if (ret != 512) {
return -1;
}
@ -222,14 +211,13 @@ static void bochs_close(BlockDriverState *bs)
{
BDRVBochsState *s = bs->opaque;
qemu_free(s->catalog_bitmap);
close(s->fd);
}
static BlockDriver bdrv_bochs = {
.format_name = "bochs",
.instance_size = sizeof(BDRVBochsState),
.bdrv_probe = bochs_probe,
.bdrv_file_open = bochs_open,
.bdrv_open = bochs_open,
.bdrv_read = bochs_read,
.bdrv_close = bochs_close,
};