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parallels: use qemu block API

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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 2010-05-06 22:04:50 +02:00 committed by Kevin Wolf
parent 9d8b88f68c
commit 1dec5a7097
1 changed files with 6 additions and 18 deletions
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24
block/parallels.c
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@ -46,7 +46,6 @@ struct parallels_header {
} __attribute__((packed));
typedef struct BDRVParallelsState {
int fd;
uint32_t *catalog_bitmap;
int catalog_size;
@ -68,22 +67,15 @@ static int parallels_probe(const uint8_t *buf, int buf_size, const char *filenam
return 0;
}
static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
static int parallels_open(BlockDriverState *bs, int flags)
{
BDRVParallelsState *s = bs->opaque;
int fd, i;
int i;
struct parallels_header ph;
fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0) {
return -1;
}
bs->read_only = 1; // no write support yet
s->fd = fd;
if (pread(fd, &ph, sizeof(ph), 0) != sizeof(ph))
if (bdrv_pread(bs->file, 0, &ph, sizeof(ph)) != sizeof(ph))
goto fail;
if (memcmp(ph.magic, HEADER_MAGIC, 16) ||
@ -97,7 +89,7 @@ static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
s->catalog_size = le32_to_cpu(ph.catalog_entries);
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
if (pread(s->fd, s->catalog_bitmap, s->catalog_size * 4, 64) !=
if (bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4) !=
s->catalog_size * 4)
goto fail;
for (i = 0; i < s->catalog_size; i++)
@ -107,7 +99,6 @@ static int parallels_open(BlockDriverState *bs, const char *filename, int flags)
fail:
if (s->catalog_bitmap)
qemu_free(s->catalog_bitmap);
close(fd);
return -1;
}
@ -128,12 +119,10 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
static int parallels_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVParallelsState *s = bs->opaque;
while (nb_sectors > 0) {
int64_t position = seek_to_sector(bs, sector_num);
if (position >= 0) {
if (pread(s->fd, buf, 512, position) != 512)
if (bdrv_pread(bs->file, position, buf, 512) != 512)
return -1;
} else {
memset(buf, 0, 512);
@ -149,14 +138,13 @@ static void parallels_close(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
qemu_free(s->catalog_bitmap);
close(s->fd);
}
static BlockDriver bdrv_parallels = {
.format_name = "parallels",
.instance_size = sizeof(BDRVParallelsState),
.bdrv_probe = parallels_probe,
.bdrv_file_open = parallels_open,
.bdrv_open = parallels_open,
.bdrv_read = parallels_read,
.bdrv_close = parallels_close,
};