block/parallels: add get_block_status
Implement VFS method for get_block_status to Parallels format driver. qemu_co_mutex_lock is not necessary yet (the driver is read-only) but will be necessary very soon when write will be supported. Signed-off-by: Roman Kagan <rkagan@parallels.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Denis V. Lunev <den@openvz.org> Message-id: 1430207220-24458-6-git-send-email-den@openvz.org CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
parent
9de9da17d8
commit
dd3bed16ff
|
@ -166,6 +166,26 @@ static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
|
||||||
return MIN(nb_sectors, ret);
|
return MIN(nb_sectors, ret);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
|
||||||
|
int64_t sector_num, int nb_sectors, int *pnum)
|
||||||
|
{
|
||||||
|
BDRVParallelsState *s = bs->opaque;
|
||||||
|
int64_t offset;
|
||||||
|
|
||||||
|
qemu_co_mutex_lock(&s->lock);
|
||||||
|
offset = seek_to_sector(s, sector_num);
|
||||||
|
qemu_co_mutex_unlock(&s->lock);
|
||||||
|
|
||||||
|
*pnum = cluster_remainder(s, sector_num, nb_sectors);
|
||||||
|
|
||||||
|
if (offset < 0) {
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
return (offset << BDRV_SECTOR_BITS) |
|
||||||
|
BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
|
||||||
|
}
|
||||||
|
|
||||||
static int parallels_read(BlockDriverState *bs, int64_t sector_num,
|
static int parallels_read(BlockDriverState *bs, int64_t sector_num,
|
||||||
uint8_t *buf, int nb_sectors)
|
uint8_t *buf, int nb_sectors)
|
||||||
{
|
{
|
||||||
|
@ -213,6 +233,7 @@ static BlockDriver bdrv_parallels = {
|
||||||
.bdrv_open = parallels_open,
|
.bdrv_open = parallels_open,
|
||||||
.bdrv_read = parallels_co_read,
|
.bdrv_read = parallels_co_read,
|
||||||
.bdrv_close = parallels_close,
|
.bdrv_close = parallels_close,
|
||||||
|
.bdrv_co_get_block_status = parallels_co_get_block_status,
|
||||||
};
|
};
|
||||||
|
|
||||||
static void bdrv_parallels_init(void)
|
static void bdrv_parallels_init(void)
|
||||||
|
|
Loading…
Reference in New Issue