diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-04-22 17:58:35 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-04-30 15:29:00 +0200 |
| commit | 607dbdc4e09bfefa3f165079a5e87df035a0e26c (patch) | |
| tree | ef1e2ec1916a9c40a2ad72707ed9e753a8ce8937 /block/backup.c | |
| parent | a4072543ccdddbd241d5962d9237b8b41fd006bf (diff) | |
block/backup: use buffer-based io
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/backup.c')
| -rw-r--r-- | block/backup.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/block/backup.c b/block/backup.c index 9988753249..910ed764aa 100644 --- a/block/backup.c +++ b/block/backup.c @@ -107,7 +107,6 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, void **bounce_buffer) { int ret; - QEMUIOVector qiov; BlockBackend *blk = job->common.blk; int nbytes; int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0; @@ -118,9 +117,8 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, if (!*bounce_buffer) { *bounce_buffer = blk_blockalign(blk, job->cluster_size); } - qemu_iovec_init_buf(&qiov, *bounce_buffer, nbytes); - ret = blk_co_preadv(blk, start, qiov.size, &qiov, read_flags); + ret = blk_co_pread(blk, start, nbytes, *bounce_buffer, read_flags); if (ret < 0) { trace_backup_do_cow_read_fail(job, start, ret); if (error_is_read) { @@ -129,13 +127,13 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, goto fail; } - if (qemu_iovec_is_zero(&qiov)) { + if (buffer_is_zero(*bounce_buffer, nbytes)) { ret = blk_co_pwrite_zeroes(job->target, start, - qiov.size, write_flags | BDRV_REQ_MAY_UNMAP); + nbytes, write_flags | BDRV_REQ_MAY_UNMAP); } else { - ret = blk_co_pwritev(job->target, start, - qiov.size, &qiov, write_flags | - (job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0)); + ret = blk_co_pwrite(job->target, start, + nbytes, *bounce_buffer, write_flags | + (job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0)); } if (ret < 0) { trace_backup_do_cow_write_fail(job, start, ret); |