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block-backend: Add device specific retry callback

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Add retry_request_cb in BlockDevOps to do device specific retry action.
Backend's timer would be registered only when the backend is set 'retry'
on errors and the device supports retry action.

Signed-off-by: Jiahui Cen <cenjiahui(a)huawei.com>
Signed-off-by: Ying Fang <fangying1(a)huawei.com>
This commit is contained in:
Huawei Technologies Co., Ltd 2021-01-21 15:46:47 +08:00 committed by Euler Robot
parent e15dae90d8
commit 788fb23e33
1 changed files with 53 additions and 0 deletions
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block-backend-Add-device-specific-retry-callback.patch Normal file
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@ -0,0 +1,53 @@
From f74edc7c8c85874691daf8801c159874ef45aae0 Mon Sep 17 00:00:00 2001
From: Jiahui Cen <cenjiahui@huawei.com>
Date: Thu, 21 Jan 2021 15:46:47 +0800
Subject: [PATCH] block-backend: Add device specific retry callback
Add retry_request_cb in BlockDevOps to do device specific retry action.
Backend's timer would be registered only when the backend is set 'retry'
on errors and the device supports retry action.
Signed-off-by: Jiahui Cen <cenjiahui(a)huawei.com>
Signed-off-by: Ying Fang <fangying1(a)huawei.com>
---
block/block-backend.c | 8 ++++++++
include/sysemu/block-backend.h | 4 ++++
2 files changed, 12 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index a9a43b1440..b8f535a5fd 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -958,6 +958,14 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
blk->dev_ops = ops;
blk->dev_opaque = opaque;
+ if ((blk->on_read_error == BLOCKDEV_ON_ERROR_RETRY ||
+ blk->on_write_error == BLOCKDEV_ON_ERROR_RETRY) &&
+ ops->retry_request_cb) {
+ blk->retry_timer = aio_timer_new(blk->ctx, QEMU_CLOCK_REALTIME,
+ SCALE_MS, ops->retry_request_cb,
+ opaque);
+ }
+
/* Are we currently quiesced? Should we enforce this right now? */
if (blk->quiesce_counter && ops->drained_begin) {
ops->drained_begin(opaque);
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 733c4957eb..b58dc6bde8 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -66,6 +66,10 @@ typedef struct BlockDevOps {
* Runs when the backend's last drain request ends.
*/
void (*drained_end)(void *opaque);
+ /*
+ * Runs when retrying failed requests.
+ */
+ void (*retry_request_cb)(void *opaque);
} BlockDevOps;
/* This struct is embedded in (the private) BlockBackend struct and contains
--
2.27.0