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[Qemu-devel] [PATCH 05/50] block: Fix BB AIOCB AioContext without BDS
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH 05/50] block: Fix BB AIOCB AioContext without BDS |
Date: |
Mon, 26 Jan 2015 11:02:39 -0500 |
Fix the BlockBackend's AIOCB AioContext for aborting AIO in case there
is no BDS. If there is no implementation of AIOCBInfo::get_aio_context()
the AioContext is derived from the BDS the AIOCB belongs to. If that BDS
is NULL (because it has been removed from the BB) this will not work.
This patch makes blk_get_aio_context() fall back to the main loop
context if the BDS pointer is NULL and implements
AIOCBInfo::get_aio_context() (blk_aiocb_get_aio_context()) which invokes
blk_get_aio_context().
Signed-off-by: Max Reitz <address@hidden>
---
block/block-backend.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index 96a5bc6..4c40747 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -18,6 +18,8 @@
/* Number of coroutines to reserve per attached device model */
#define COROUTINE_POOL_RESERVATION 64
+static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb);
+
struct BlockBackend {
char *name;
int refcnt;
@@ -34,10 +36,12 @@ struct BlockBackend {
typedef struct BlockBackendAIOCB {
BlockAIOCB common;
QEMUBH *bh;
+ BlockBackend *blk;
int ret;
} BlockBackendAIOCB;
static const AIOCBInfo block_backend_aiocb_info = {
+ .get_aio_context = blk_aiocb_get_aio_context,
.aiocb_size = sizeof(BlockBackendAIOCB),
};
@@ -530,6 +534,7 @@ static BlockAIOCB *abort_aio_request(BlockBackend *blk,
BlockCompletionFunc *cb,
QEMUBH *bh;
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
+ acb->blk = blk;
acb->ret = ret;
bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb);
@@ -783,7 +788,17 @@ void blk_op_unblock_all(BlockBackend *blk, Error *reason)
AioContext *blk_get_aio_context(BlockBackend *blk)
{
- return bdrv_get_aio_context(blk->bs);
+ if (blk->bs) {
+ return bdrv_get_aio_context(blk->bs);
+ } else {
+ return qemu_get_aio_context();
+ }
+}
+
+static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb)
+{
+ BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb);
+ return blk_get_aio_context(blk_acb->blk);
}
void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
--
2.1.0
- [Qemu-devel] [PATCH 00/50] blockdev: BlockBackend and media, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 04/50] hw/usb-storage: Check whether BB is inserted, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 08/50] block/quorum: Implement bdrv_is_inserted(), Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 05/50] block: Fix BB AIOCB AioContext without BDS,
Max Reitz <=
- [Qemu-devel] [PATCH 01/50] blockdev: Allow creation of BDS trees without BB, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 03/50] hw/block/fdc: Implement tray status, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 02/50] iotests: Only create BB if necessary, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 13/50] block: Add BlockBackendRootState, Max Reitz, 2015/01/26
- [Qemu-devel] [PATCH 14/50] block: Make some BB functions fall back to BBRS, Max Reitz, 2015/01/26