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[Qemu-block] [PATCH 6/9] block/backup: use buffer-based io
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-block] [PATCH 6/9] block/backup: use buffer-based io |
Date: |
Mon, 22 Apr 2019 17:58:35 +0300 |
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
block/backup.c | 14 ++++++--------
1 file 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);
--
2.18.0
- [Qemu-block] [PATCH 0/9] block: buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 8/9] block/stream: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 7/9] block/commit: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 1/9] block: introduce byte-based io helpers, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 6/9] block/backup: use buffer-based io,
Vladimir Sementsov-Ogievskiy <=
- [Qemu-block] [PATCH 4/9] block/qed: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 5/9] block/parallels: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 2/9] block/qcow2: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 3/9] block/qcow: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- [Qemu-block] [PATCH 9/9] qemu-img: use buffer-based io, Vladimir Sementsov-Ogievskiy, 2019/04/22
- Re: [Qemu-block] [PATCH 0/9] block: buffer-based io, Stefan Hajnoczi, 2019/04/23
- Re: [Qemu-block] [Qemu-devel] [PATCH 0/9] block: buffer-based io, Stefano Garzarella, 2019/04/30