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vvfat: fix qemu-img map and qemu-img convert

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- bs->total_sectors is the number of sectors of the whole disk
- s->sector_count is the number of sectors of the FAT partition

This fixes the following assert in qemu-img map:
qemu-img.c:2641: get_block_status: Assertion `nb_sectors' failed.

This also fixes an infinite loop in qemu-img convert.

Fixes: 4480e0f924
Fixes: https://bugs.launchpad.net/qemu/+bug/1599539
Cc: qemu-stable@nongnu.org
Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hervé Poussineau 2017-05-22 23:11:53 +02:00 committed by Kevin Wolf
parent 544daf6679
commit 139921aaa7
1 changed files with 1 additions and 2 deletions
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3
block/vvfat.c
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@ -2968,8 +2968,7 @@ vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *n, BlockDriverState **file)
{
BDRVVVFATState* s = bs->opaque;
*n = s->sector_count - sector_num;
*n = bs->total_sectors - sector_num;
if (*n > nb_sectors) {
*n = nb_sectors;
} else if (*n < 0) {