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block/parallels: add get_block_status

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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:
Roman Kagan 2015-04-28 10:46:38 +03:00 committed by Stefan Hajnoczi
parent 9de9da17d8
commit dd3bed16ff
1 changed files with 21 additions and 0 deletions
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21
block/parallels.c
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@ -166,6 +166,26 @@ static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
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,
uint8_t *buf, int nb_sectors)
{
@ -213,6 +233,7 @@ static BlockDriver bdrv_parallels = {
.bdrv_open = parallels_open,
.bdrv_read = parallels_co_read,
.bdrv_close = parallels_close,
.bdrv_co_get_block_status = parallels_co_get_block_status,
};
static void bdrv_parallels_init(void)