diff mbox series

[RFC,v2,1/8] block-backend: introduce I/O rehandle info

Message ID 20200930094606.5323-2-cenjiahui@huawei.com
State New
Headers show
Series block-backend: Introduce I/O hang | expand

Commit Message

cenjiahui Sept. 30, 2020, 9:45 a.m. UTC 
The I/O hang feature is realized based on a rehandle mechanism.
Each block backend will have a list to store hanging block AIOs,
and a timer to regularly resend these aios. In order to issue
the AIOs again, each block AIOs also need to store its coroutine entry.

Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Ying Fang <fangying1@huawei.com>
---
 block/block-backend.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/block/block-backend.c b/block/block-backend.c
index ce78d30794..b8367d82cc 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -35,6 +35,18 @@ 
 
 static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb);
 
+/* block backend rehandle timer interval 5s */
+#define BLOCK_BACKEND_REHANDLE_TIMER_INTERVAL   5000
+
+typedef struct BlockBackendRehandleInfo {
+    bool enable;
+    QEMUTimer *ts;
+    unsigned timer_interval_ms;
+
+    unsigned int in_flight;
+    QTAILQ_HEAD(, BlkAioEmAIOCB) re_aios;
+} BlockBackendRehandleInfo;
+
 typedef struct BlockBackendAioNotifier {
     void (*attached_aio_context)(AioContext *new_context, void *opaque);
     void (*detach_aio_context)(void *opaque);
@@ -95,6 +107,8 @@  struct BlockBackend {
      * Accessed with atomic ops.
      */
     unsigned int in_flight;
+
+    BlockBackendRehandleInfo reinfo;
 };
 
 typedef struct BlockBackendAIOCB {
@@ -350,6 +364,7 @@  BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm)
     qemu_co_queue_init(&blk->queued_requests);
     notifier_list_init(&blk->remove_bs_notifiers);
     notifier_list_init(&blk->insert_bs_notifiers);
+
     QLIST_INIT(&blk->aio_notifiers);
 
     QTAILQ_INSERT_TAIL(&block_backends, blk, link);
@@ -1392,6 +1407,10 @@  typedef struct BlkAioEmAIOCB {
     BlkRwCo rwco;
     int bytes;
     bool has_returned;
+
+    /* for rehandle */
+    CoroutineEntry *co_entry;
+    QTAILQ_ENTRY(BlkAioEmAIOCB) list;
 } BlkAioEmAIOCB;
 
 static AioContext *blk_aio_em_aiocb_get_aio_context(BlockAIOCB *acb_)