176 lines
5 KiB
C
176 lines
5 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 "qemu/job.h"
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#include "block/block.h"
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#include "qemu/ratelimit.h"
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#define BLOCK_JOB_SLICE_TIME 100000000ULL /* ns */
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typedef struct BlockJobDriver BlockJobDriver;
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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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/** Data belonging to the generic Job infrastructure */
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Job job;
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/** The block device on which the job is operating. */
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BlockBackend *blk;
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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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/** Speed that was set with @block_job_set_speed. */
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int64_t speed;
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/** Rate limiting data structure for implementing @speed. */
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RateLimit limit;
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/** Block other operations when block job is running */
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Error *blocker;
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/** Called when a cancelled job is finalised. */
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Notifier finalize_cancelled_notifier;
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/** Called when a successfully completed job is finalised. */
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Notifier finalize_completed_notifier;
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/** Called when the job transitions to PENDING */
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Notifier pending_notifier;
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/** Called when the job transitions to READY */
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Notifier ready_notifier;
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/** Called when the job coroutine yields or terminates */
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Notifier idle_notifier;
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/** BlockDriverStates that are involved in this block job */
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GSList *nodes;
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} BlockJob;
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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_has_bdrv:
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* @job: The block job
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*
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* Searches for @bs in the list of nodes that are involved in the
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* job.
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*/
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bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs);
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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_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_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_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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/**
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* block_job_driver:
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*
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* Returns the driver associated with a block job.
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*/
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const BlockJobDriver *block_job_driver(BlockJob *job);
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#endif
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