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vvfat: do not fail if the disk has spare sectors

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If the number of "faked sectors" + the number of sectors that are
part of a cluster does not sum up to the total number of sectors,
qemu-img convert fails.  Read these spare sectors as all zeros.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-05 09:12:04 +02:00 committed by Kevin Wolf
parent 2b6a43a835
commit e654bfe4c1
1 changed files with 2 additions and 2 deletions
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4
block/vvfat.c
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@ -1245,7 +1245,7 @@ static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
int i;
for(i=0;i<nb_sectors;i++,sector_num++) {
if (sector_num >= s->sector_count)
if (sector_num >= bs->total_sectors)
return -1;
if (s->qcow) {
int n;
@ -1271,7 +1271,7 @@ DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num));
uint32_t sector=sector_num-s->faked_sectors,
sector_offset_in_cluster=(sector%s->sectors_per_cluster),
cluster_num=sector/s->sectors_per_cluster;
if(read_cluster(s, cluster_num) != 0) {
if(cluster_num > s->cluster_count || read_cluster(s, cluster_num) != 0) {
/* LATER TODO: strict: return -1; */
memset(buf+i*0x200,0,0x200);
continue;