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qemu-img: convert: don't use unallocated_blocks_are_zero

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qemu-img convert wants to distinguish ZERO which comes from short
backing files. unallocated_blocks_are_zero field of bdi is unrelated:
space after EOF is always considered to be zero anyway. So, just make
post_backing_zero true in case of short backing file.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200528094405.145708-2-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-05-28 12:43:56 +03:00 committed by Max Reitz
parent a2cd85f6ac
commit 2253d86eb4
1 changed files with 1 additions and 3 deletions
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4
qemu-img.c
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@ -1681,7 +1681,6 @@ typedef struct ImgConvertState {
BlockBackend *target;
bool has_zero_init;
bool compressed;
bool unallocated_blocks_are_zero;
bool target_is_new;
bool target_has_backing;
int64_t target_backing_sectors; /* negative if unknown */
@ -1726,7 +1725,7 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
if (s->target_backing_sectors >= 0) {
if (sector_num >= s->target_backing_sectors) {
post_backing_zero = s->unallocated_blocks_are_zero;
post_backing_zero = true;
} else if (sector_num + n > s->target_backing_sectors) {
/* Split requests around target_backing_sectors (because
* starting from there, zeros are handled differently) */
@ -2678,7 +2677,6 @@ static int img_convert(int argc, char **argv)
} else {
s.compressed = s.compressed || bdi.needs_compressed_writes;
s.cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
s.unallocated_blocks_are_zero = bdi.unallocated_blocks_are_zero;
}
ret = convert_do_copy(&s);