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block: don't keep AioContext acquired after blockdev_backup_prepare() 

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171206144550.22295-5-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-12-06 14:45:45 +00:00
parent 66d56054bc
commit edd5adeecd
1 changed files with 34 additions and 10 deletions
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44
blockdev.c
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@ -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 {