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block/qcow2: refactor qcow2_co_preadv to use buffer-based io 

Use buffer based io in encrypted case.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20190604161514.262241-11-vsementsov@virtuozzo.com
Message-Id: <20190604161514.262241-11-vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-06-04 19:15:12 +03:00 committed by Stefan Hajnoczi
parent 1acc3466a2
commit 00721a3529
1 changed files with 16 additions and 12 deletions
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28
block/qcow2.c
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@ -2059,19 +2059,15 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
}
assert(cur_bytes <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
qemu_iovec_reset(&hd_qiov);
qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes);
}
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
ret = bdrv_co_preadv(s->data_file,
cluster_offset + offset_in_cluster,
cur_bytes, &hd_qiov, 0);
if (ret < 0) {
goto fail;
}
if (bs->encrypted) {
assert(s->crypto);
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
ret = bdrv_co_pread(s->data_file,
cluster_offset + offset_in_cluster,
cur_bytes, cluster_data, 0);
if (ret < 0) {
goto fail;
}
assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
assert((cur_bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
if (qcow2_co_decrypt(bs, cluster_offset, offset,
@ -2080,6 +2076,14 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
goto fail;
}
qemu_iovec_from_buf(qiov, bytes_done, cluster_data, cur_bytes);
} else {
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
ret = bdrv_co_preadv(s->data_file,
cluster_offset + offset_in_cluster,
cur_bytes, &hd_qiov, 0);
if (ret < 0) {
goto fail;
}
}
break;