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authorMax Reitz <mreitz@redhat.com>2019-07-24 19:12:29 +0200
committerMax Reitz <mreitz@redhat.com>2019-08-19 17:13:26 +0200
commit4d7c487eac1652dfe4498fe84f32900ad461d61b (patch)
tree5f990d40e76ae167306c080e8d9f7126061e17c6 /qemu-img.c
parent672de729a1f93d84e7597652b1125ab5d62421d8 (diff)
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qemu-img: Fix bdrv_has_zero_init() use in convert
bdrv_has_zero_init() only has meaning for newly created images or image areas. If qemu-img convert did not create the image itself, it cannot rely on bdrv_has_zero_init()'s result to carry any meaning. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190724171239.8764-2-mreitz@redhat.com Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qemu-img.c')
-rw-r--r--qemu-img.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/qemu-img.c b/qemu-img.c
index c920e35..7daa05e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1578,6 +1578,7 @@ typedef struct ImgConvertState {
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 */
bool wr_in_order;
@@ -1975,9 +1976,11 @@ static int convert_do_copy(ImgConvertState *s)
int64_t sector_num = 0;
/* Check whether we have zero initialisation or can get it efficiently */
- s->has_zero_init = s->min_sparse && !s->target_has_backing
- ? bdrv_has_zero_init(blk_bs(s->target))
- : false;
+ if (s->target_is_new && s->min_sparse && !s->target_has_backing) {
+ s->has_zero_init = bdrv_has_zero_init(blk_bs(s->target));
+ } else {
+ s->has_zero_init = false;
+ }
if (!s->has_zero_init && !s->target_has_backing &&
bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)))
@@ -2428,6 +2431,8 @@ static int img_convert(int argc, char **argv)
}
}
+ s.target_is_new = !skip_create;
+
flags = s.min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR;
ret = bdrv_parse_cache_mode(cache, &flags, &writethrough);
if (ret < 0) {