[PATCH for-5.0 v2] qemu-img: Report convert errors by bytes, not sectors

[Eric Blake <eblake@redhat.com>]

Various qemu-img commands are inconsistent on whether they report
status/errors in terms of bytes or sector offsets.  The latter is
confusing (especially as more places move to 4k block sizes), so let's
switch everything to just use bytes everywhere.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---

- v2: fix printf formats [patchew]

 qemu-img.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index b167376bd72e..821cbf610e5f 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1924,8 +1924,8 @@ retry:
         if (status == BLK_DATA && !copy_range) {
             ret = convert_co_read(s, sector_num, n, buf);
             if (ret < 0) {
-                error_report("error while reading sector %" PRId64
-                             ": %s", sector_num, strerror(-ret));
+                error_report("error while reading at byte %lld: %s",
+                             sector_num * BDRV_SECTOR_SIZE, strerror(-ret));
                 s->ret = ret;
             }
         } else if (!s->min_sparse && status == BLK_ZERO) {
@@ -1953,8 +1953,8 @@ retry:
                 ret = convert_co_write(s, sector_num, n, buf, status);
             }
             if (ret < 0) {
-                error_report("error while writing sector %" PRId64
-                             ": %s", sector_num, strerror(-ret));
+                error_report("error while writing at byte %lld: %s",
+                             sector_num * BDRV_SECTOR_SIZE, strerror(-ret));
                 s->ret = ret;
             }
         }
-- 
2.26.0.rc2