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block: Add block job transactions

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Sometimes block jobs must execute as a transaction group.  Finishing
jobs wait until all other jobs are ready to complete successfully.
Failure or cancellation of one job cancels the other jobs in the group.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1446765200-3054-10-git-send-email-jsnow@redhat.com
[Rewrite the implementation which is now contained in block_job_completed.
--Fam]
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-11-05 18:13:15 -05:00 • committed by Kevin Wolf
parent 94db6d2d30
commit c55a832fdd
3 changed files with 172 additions and 2 deletions
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1
include/block/block.h
View file

@ -14,6 +14,7 @@ typedef struct BlockDriver BlockDriver;
typedef struct BlockJob BlockJob;
typedef struct BdrvChild BdrvChild;
typedef struct BdrvChildRole BdrvChildRole;
typedef struct BlockJobTxn BlockJobTxn;
typedef struct BlockDriverInfo {
/* in bytes, 0 if irrelevant */

38
include/block/blockjob.h
View file

@ -162,6 +162,9 @@ struct BlockJob {
*/
int ret;
/** Non-NULL if this job is part of a transaction */
BlockJobTxn *txn;
QLIST_ENTRY(BlockJob) txn_list;
};
/**
@ -405,4 +408,39 @@ void block_job_defer_to_main_loop(BlockJob *job,
BlockJobDeferToMainLoopFn *fn,
void *opaque);
/**
* block_job_txn_new:
*
* Allocate and return a new block job transaction. Jobs can be added to the
* transaction using block_job_txn_add_job().
*
* The transaction is automatically freed when the last job completes or is
* cancelled.
*
* All jobs in the transaction either complete successfully or fail/cancel as a
* group. Jobs wait for each other before completing. Cancelling one job
* cancels all jobs in the transaction.
*/
BlockJobTxn *block_job_txn_new(void);
/**
* block_job_txn_unref:
*
* Release a reference that was previously acquired with block_job_txn_add_job
* or block_job_txn_new. If it's the last reference to the object, it will be
* freed.
*/
void block_job_txn_unref(BlockJobTxn *txn);
/**
* block_job_txn_add_job:
* @txn: The transaction (may be NULL)
* @job: Job to add to the transaction
*
* Add @job to the transaction. The @job must not already be in a transaction.
* The caller must call either block_job_txn_unref() or block_job_completed()
* to release the reference that is automatically grabbed here.
*/
void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job);
#endif