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[Qemu-block] [PATCH v2 4/9] block: don't keep AioContext acquired after
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-block] [PATCH v2 4/9] block: don't keep AioContext acquired after blockdev_backup_prepare() |
Date: |
Wed, 6 Dec 2017 14:45:45 +0000 |
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
blockdev.c | 44 ++++++++++++++++++++++++++++++++++----------
1 file changed, 34 insertions(+), 10 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 5a56a1abf2..d7ad76416e 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1936,7 +1936,6 @@ typedef struct BlockdevBackupState {
BlkActionState common;
BlockDriverState *bs;
BlockJob *job;
- AioContext *aio_context;
} BlockdevBackupState;
static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn,
@@ -1947,6 +1946,7 @@ static void blockdev_backup_prepare(BlkActionState
*common, Error **errp)
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common,
common);
BlockdevBackup *backup;
BlockDriverState *bs, *target;
+ AioContext *aio_context;
Error *local_err = NULL;
assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
@@ -1962,29 +1962,39 @@ static void blockdev_backup_prepare(BlkActionState
*common, Error **errp)
return;
}
- /* AioContext is released in .clean() */
- state->aio_context = bdrv_get_aio_context(bs);
- if (state->aio_context != bdrv_get_aio_context(target)) {
- state->aio_context = NULL;
+ aio_context = bdrv_get_aio_context(bs);
+ if (aio_context != bdrv_get_aio_context(target)) {
error_setg(errp, "Backup between two IO threads is not implemented");
return;
}
- aio_context_acquire(state->aio_context);
+ aio_context_acquire(aio_context);
state->bs = bs;
+
+ /* Paired with .clean() */
bdrv_drained_begin(state->bs);
state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
if (local_err) {
error_propagate(errp, local_err);
- return;
+ goto out;
}
+
+out:
+ aio_context_release(aio_context);
}
static void blockdev_backup_commit(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common,
common);
+ AioContext *aio_context;
+
+ aio_context = bdrv_get_aio_context(state->bs);
+ aio_context_acquire(aio_context);
+
assert(state->job);
block_job_start(state->job);
+
+ aio_context_release(aio_context);
}
static void blockdev_backup_abort(BlkActionState *common)
@@ -1992,18 +2002,32 @@ static void blockdev_backup_abort(BlkActionState
*common)
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common,
common);
if (state->job) {
+ AioContext *aio_context;
+
+ aio_context = bdrv_get_aio_context(state->bs);
+ aio_context_acquire(aio_context);
+
block_job_cancel_sync(state->job);
+
+ aio_context_release(aio_context);
}
}
static void blockdev_backup_clean(BlkActionState *common)
{
BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common,
common);
+ AioContext *aio_context;
- if (state->aio_context) {
- bdrv_drained_end(state->bs);
- aio_context_release(state->aio_context);
+ if (!state->bs) {
+ return;
}
+
+ aio_context = bdrv_get_aio_context(state->bs);
+ aio_context_acquire(aio_context);
+
+ bdrv_drained_end(state->bs);
+
+ aio_context_release(aio_context);
}
typedef struct BlockDirtyBitmapState {
--
2.14.3
- [Qemu-block] [PATCH v2 0/9] blockdev: fix QMP 'transaction' with IOThreads, Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 1/9] blockdev: hold AioContext for bdrv_unref() in external_snapshot_clean(), Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 2/9] block: don't keep AioContext acquired after external_snapshot_prepare(), Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 3/9] block: don't keep AioContext acquired after drive_backup_prepare(), Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 4/9] block: don't keep AioContext acquired after blockdev_backup_prepare(),
Stefan Hajnoczi <=
- [Qemu-block] [PATCH v2 5/9] block: don't keep AioContext acquired after internal_snapshot_prepare(), Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 6/9] block: drop unused BlockDirtyBitmapState->aio_context field, Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 7/9] iothread: add iothread_by_id() API, Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 8/9] blockdev: add x-blockdev-set-iothread testing command, Stefan Hajnoczi, 2017/12/06
- [Qemu-block] [PATCH v2 9/9] qemu-iotests: add 202 external snapshots IOThread test, Stefan Hajnoczi, 2017/12/06