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block/qcow2: 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>
master
Vladimir Sementsov-Ogievskiy 2019-04-22 17:58:31 +03:00 committed by Kevin Wolf
parent 371420e217
commit b00cb15bda
1 changed files with 2 additions and 7 deletions
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9
block/qcow2.c
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@ -4094,7 +4094,6 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
uint64_t bytes, QEMUIOVector *qiov)
{
BDRVQcow2State *s = bs->opaque;
QEMUIOVector hd_qiov;
int ret;
ssize_t out_len;
uint8_t *buf, *out_buf;
@ -4161,10 +4160,8 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
goto fail;
}
qemu_iovec_init_buf(&hd_qiov, out_buf, out_len);
BLKDBG_EVENT(s->data_file, BLKDBG_WRITE_COMPRESSED);
ret = bdrv_co_pwritev(s->data_file, cluster_offset, out_len, &hd_qiov, 0);
ret = bdrv_co_pwrite(s->data_file, cluster_offset, out_len, out_buf, 0);
if (ret < 0) {
goto fail;
}
@ -4187,7 +4184,6 @@ qcow2_co_preadv_compressed(BlockDriverState *bs,
int ret = 0, csize, nb_csectors;
uint64_t coffset;
uint8_t *buf, *out_buf;
QEMUIOVector local_qiov;
int offset_in_cluster = offset_into_cluster(s, offset);
coffset = file_cluster_offset & s->cluster_offset_mask;
@ -4198,12 +4194,11 @@ qcow2_co_preadv_compressed(BlockDriverState *bs,
if (!buf) {
return -ENOMEM;
}
qemu_iovec_init_buf(&local_qiov, buf, csize);
out_buf = qemu_blockalign(bs, s->cluster_size);
BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED);
ret = bdrv_co_preadv(bs->file, coffset, csize, &local_qiov, 0);
ret = bdrv_co_pread(bs->file, coffset, csize, buf, 0);
if (ret < 0) {
goto fail;
}