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block/backup: use qemu_iovec_init_buf 

Use new qemu_iovec_init_buf() instead of
qemu_iovec_init_external( ... , 1), which simplifies the code.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20190218140926.333779-5-vsementsov@virtuozzo.com
Message-Id: <20190218140926.333779-5-vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-02-18 17:09:13 +03:00 committed by Stefan Hajnoczi
parent ae5a9592ce
commit 31e0a6e1af
1 changed files with 1 additions and 4 deletions
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5
block/backup.c
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@ -107,7 +107,6 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
void **bounce_buffer)
{
int ret;
struct iovec iov;
QEMUIOVector qiov;
BlockBackend *blk = job->common.blk;
int nbytes;
@ -119,9 +118,7 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
if (!*bounce_buffer) {
*bounce_buffer = blk_blockalign(blk, job->cluster_size);
}
iov.iov_base = *bounce_buffer;
iov.iov_len = nbytes;
qemu_iovec_init_external(&qiov, &iov, 1);
qemu_iovec_init_buf(&qiov, *bounce_buffer, nbytes);
ret = blk_co_preadv(blk, start, qiov.size, &qiov, read_flags);
if (ret < 0) {