370 lines
10 KiB
C
370 lines
10 KiB
C
/*
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* Declarations for long-running block device operations
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*
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* Copyright (c) 2011 IBM Corp.
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* Copyright (c) 2012 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef BLOCKJOB_H
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#define BLOCKJOB_H
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#include "block/block.h"
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typedef struct BlockJobDriver BlockJobDriver;
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typedef struct BlockJobTxn BlockJobTxn;
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/**
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* BlockJob:
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*
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* Long-running operation on a BlockDriverState.
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*/
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typedef struct BlockJob {
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/** The job type, including the job vtable. */
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const BlockJobDriver *driver;
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/** The block device on which the job is operating. */
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BlockBackend *blk;
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/**
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* The ID of the block job. May be NULL for internal jobs.
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*/
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char *id;
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/**
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* The coroutine that executes the job. If not NULL, it is
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* reentered when busy is false and the job is cancelled.
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*/
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Coroutine *co;
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/**
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* Set to true if the job should cancel itself. The flag must
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* always be tested just before toggling the busy flag from false
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* to true. After a job has been cancelled, it should only yield
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* if #aio_poll will ("sooner or later") reenter the coroutine.
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*/
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bool cancelled;
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/**
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* Counter for pause request. If non-zero, the block job is either paused,
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* or if busy == true will pause itself as soon as possible.
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*/
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int pause_count;
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/**
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* Set to true if the job is paused by user. Can be unpaused with the
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* block-job-resume QMP command.
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*/
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bool user_paused;
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/**
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* Set to false by the job while the coroutine has yielded and may be
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* re-entered by block_job_enter(). There may still be I/O or event loop
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* activity pending.
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*/
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bool busy;
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/**
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* Set to true by the job while it is in a quiescent state, where
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* no I/O or event loop activity is pending.
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*/
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bool paused;
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/**
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* Set to true when the job is ready to be completed.
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*/
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bool ready;
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/**
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* Set to true when the job has deferred work to the main loop.
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*/
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bool deferred_to_main_loop;
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/** Element of the list of block jobs */
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QLIST_ENTRY(BlockJob) job_list;
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/** Status that is published by the query-block-jobs QMP API */
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BlockDeviceIoStatus iostatus;
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/** Offset that is published by the query-block-jobs QMP API */
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int64_t offset;
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/** Length that is published by the query-block-jobs QMP API */
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int64_t len;
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/** Speed that was set with @block_job_set_speed. */
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int64_t speed;
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/** The completion function that will be called when the job completes. */
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BlockCompletionFunc *cb;
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/** Block other operations when block job is running */
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Error *blocker;
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/** BlockDriverStates that are involved in this block job */
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GSList *nodes;
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/** The opaque value that is passed to the completion function. */
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void *opaque;
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/** Reference count of the block job */
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int refcnt;
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/* True if this job has reported completion by calling block_job_completed.
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*/
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bool completed;
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/* ret code passed to block_job_completed.
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*/
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int ret;
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/** Non-NULL if this job is part of a transaction */
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BlockJobTxn *txn;
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QLIST_ENTRY(BlockJob) txn_list;
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} BlockJob;
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typedef enum BlockJobCreateFlags {
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BLOCK_JOB_DEFAULT = 0x00,
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BLOCK_JOB_INTERNAL = 0x01,
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} BlockJobCreateFlags;
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/**
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* block_job_next:
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* @job: A block job, or %NULL.
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*
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* Get the next element from the list of block jobs after @job, or the
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* first one if @job is %NULL.
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*
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* Returns the requested job, or %NULL if there are no more jobs left.
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*/
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BlockJob *block_job_next(BlockJob *job);
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/**
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* block_job_get:
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* @id: The id of the block job.
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*
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* Get the block job identified by @id (which must not be %NULL).
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*
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* Returns the requested job, or %NULL if it doesn't exist.
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*/
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BlockJob *block_job_get(const char *id);
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/**
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* block_job_add_bdrv:
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* @job: A block job
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* @name: The name to assign to the new BdrvChild
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* @bs: A BlockDriverState that is involved in @job
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* @perm, @shared_perm: Permissions to request on the node
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*
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* Add @bs to the list of BlockDriverState that are involved in
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* @job. This means that all operations will be blocked on @bs while
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* @job exists.
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*/
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int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
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uint64_t perm, uint64_t shared_perm, Error **errp);
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/**
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* block_job_remove_all_bdrv:
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* @job: The block job
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*
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* Remove all BlockDriverStates from the list of nodes that are involved in the
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* job. This removes the blockers added with block_job_add_bdrv().
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*/
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void block_job_remove_all_bdrv(BlockJob *job);
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/**
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* block_job_set_speed:
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* @job: The job to set the speed for.
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* @speed: The new value
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* @errp: Error object.
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*
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* Set a rate-limiting parameter for the job; the actual meaning may
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* vary depending on the job type.
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*/
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void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp);
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/**
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* block_job_start:
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* @job: A job that has not yet been started.
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*
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* Begins execution of a block job.
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* Takes ownership of one reference to the job object.
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*/
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void block_job_start(BlockJob *job);
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/**
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* block_job_cancel:
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* @job: The job to be canceled.
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*
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* Asynchronously cancel the specified job.
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*/
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void block_job_cancel(BlockJob *job);
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/**
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* block_job_complete:
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* @job: The job to be completed.
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* @errp: Error object.
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*
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* Asynchronously complete the specified job.
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*/
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void block_job_complete(BlockJob *job, Error **errp);
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/**
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* block_job_query:
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* @job: The job to get information about.
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*
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* Return information about a job.
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*/
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BlockJobInfo *block_job_query(BlockJob *job, Error **errp);
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/**
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* block_job_user_pause:
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* @job: The job to be paused.
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*
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* Asynchronously pause the specified job.
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* Do not allow a resume until a matching call to block_job_user_resume.
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*/
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void block_job_user_pause(BlockJob *job);
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/**
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* block_job_paused:
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* @job: The job to query.
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*
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* Returns true if the job is user-paused.
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*/
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bool block_job_user_paused(BlockJob *job);
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/**
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* block_job_user_resume:
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* @job: The job to be resumed.
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*
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* Resume the specified job.
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* Must be paired with a preceding block_job_user_pause.
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*/
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void block_job_user_resume(BlockJob *job);
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/**
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* block_job_cancel_sync:
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* @job: The job to be canceled.
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*
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* Synchronously cancel the job. The completion callback is called
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* before the function returns. The job may actually complete
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* instead of canceling itself; the circumstances under which this
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* happens depend on the kind of job that is active.
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*
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* Returns the return value from the job if the job actually completed
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* during the call, or -ECANCELED if it was canceled.
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*/
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int block_job_cancel_sync(BlockJob *job);
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/**
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* block_job_cancel_sync_all:
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*
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* Synchronously cancels all jobs using block_job_cancel_sync().
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*/
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void block_job_cancel_sync_all(void);
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/**
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* block_job_complete_sync:
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* @job: The job to be completed.
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* @errp: Error object which may be set by block_job_complete(); this is not
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* necessarily set on every error, the job return value has to be
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* checked as well.
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*
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* Synchronously complete the job. The completion callback is called before the
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* function returns, unless it is NULL (which is permissible when using this
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* function).
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*
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* Returns the return value from the job.
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*/
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int block_job_complete_sync(BlockJob *job, Error **errp);
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/**
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* block_job_iostatus_reset:
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* @job: The job whose I/O status should be reset.
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*
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* Reset I/O status on @job and on BlockDriverState objects it uses,
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* other than job->blk.
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*/
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void block_job_iostatus_reset(BlockJob *job);
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/**
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* block_job_txn_new:
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*
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* Allocate and return a new block job transaction. Jobs can be added to the
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* transaction using block_job_txn_add_job().
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*
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* The transaction is automatically freed when the last job completes or is
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* cancelled.
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*
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* All jobs in the transaction either complete successfully or fail/cancel as a
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* group. Jobs wait for each other before completing. Cancelling one job
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* cancels all jobs in the transaction.
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*/
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BlockJobTxn *block_job_txn_new(void);
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/**
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* block_job_ref:
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*
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* Add a reference to BlockJob refcnt, it will be decreased with
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* block_job_unref, and then be freed if it comes to be the last
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* reference.
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*/
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void block_job_ref(BlockJob *job);
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/**
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* block_job_unref:
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*
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* Release a reference that was previously acquired with block_job_ref
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* or block_job_create. If it's the last reference to the object, it will be
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* freed.
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*/
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void block_job_unref(BlockJob *job);
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/**
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* block_job_txn_unref:
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*
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* Release a reference that was previously acquired with block_job_txn_add_job
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* or block_job_txn_new. If it's the last reference to the object, it will be
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* freed.
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*/
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void block_job_txn_unref(BlockJobTxn *txn);
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/**
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* block_job_txn_add_job:
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* @txn: The transaction (may be NULL)
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* @job: Job to add to the transaction
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*
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* Add @job to the transaction. The @job must not already be in a transaction.
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* The caller must call either block_job_txn_unref() or block_job_completed()
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* to release the reference that is automatically grabbed here.
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*/
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void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job);
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/**
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* block_job_is_internal:
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* @job: The job to determine if it is user-visible or not.
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*
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* Returns true if the job should not be visible to the management layer.
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*/
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bool block_job_is_internal(BlockJob *job);
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#endif
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