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[Qemu-block] [RFC PATCH 2/3] block/qcow2: refactor qcow2_co_preadv to us
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-block] [RFC PATCH 2/3] block/qcow2: refactor qcow2_co_preadv to use buffer-based io |
Date: |
Tue, 21 May 2019 11:45:21 +0300 |
Use buffer based io in encrypted case.
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
block/qcow2.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index de524d870b..5b4e5e7537 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2047,19 +2047,15 @@ 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,
@@ -2068,6 +2064,14 @@ 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;
--
2.18.0