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/*
* Declarations for long-running block device operations
*
* Copyright (c) 2011 IBM Corp.
* Copyright (c) 2012 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef BLOCKJOB_H
#define BLOCKJOB_H
#include "qemu/job.h"
#include "block/block.h"
#include "qemu/ratelimit.h"
#define BLOCK_JOB_SLICE_TIME 100000000ULL /* ns */
typedef struct BlockJobDriver BlockJobDriver;
/**
* BlockJob:
*
* Long-running operation on a BlockDriverState.
*/
typedef struct BlockJob {
/**
* Data belonging to the generic Job infrastructure.
* Protected by job mutex.
*/
Job job;
/**
* Status that is published by the query-block-jobs QMP API.
* Protected by job mutex.
*/
BlockDeviceIoStatus iostatus;
/**
* Speed that was set with @block_job_set_speed.
* Always modified and read under QEMU global mutex (GLOBAL_STATE_CODE).
*/
int64_t speed;
/**
* Rate limiting data structure for implementing @speed.
* RateLimit API is thread-safe.
*/
RateLimit limit;
/**
* Block other operations when block job is running.
* Always modified and read under QEMU global mutex (GLOBAL_STATE_CODE).
*/
Error *blocker;
/** All notifiers are set once in block_job_create() and never modified. */
/** Called when a cancelled job is finalised. */
Notifier finalize_cancelled_notifier;
/** Called when a successfully completed job is finalised. */
Notifier finalize_completed_notifier;
/** Called when the job transitions to PENDING */
Notifier pending_notifier;
/** Called when the job transitions to READY */
Notifier ready_notifier;
/** Called when the job coroutine yields or terminates */
Notifier idle_notifier;
/**
* BlockDriverStates that are involved in this block job.
* Always modified and read under QEMU global mutex (GLOBAL_STATE_CODE).
*/
GSList *nodes;
} BlockJob;
/*
* Global state (GS) API. These functions run under the BQL.
*
* See include/block/block-global-state.h for more information about
* the GS API.
*/
/**
* block_job_next_locked:
* @job: A block job, or %NULL.
*
* Get the next element from the list of block jobs after @job, or the
* first one if @job is %NULL.
*
* Returns the requested job, or %NULL if there are no more jobs left.
* Called with job lock held.
*/
BlockJob *block_job_next_locked(BlockJob *job);
/**
* block_job_get:
* @id: The id of the block job.
*
* Get the block job identified by @id (which must not be %NULL).
*
* Returns the requested job, or %NULL if it doesn't exist.
* Called with job lock *not* held.
*/
BlockJob *block_job_get(const char *id);
/* Same as block_job_get(), but called with job lock held. */
BlockJob *block_job_get_locked(const char *id);
/**
* block_job_add_bdrv:
* @job: A block job
* @name: The name to assign to the new BdrvChild
* @bs: A BlockDriverState that is involved in @job
* @perm, @shared_perm: Permissions to request on the node
*
* Add @bs to the list of BlockDriverState that are involved in
* @job. This means that all operations will be blocked on @bs while
* @job exists.
*/
int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
uint64_t perm, uint64_t shared_perm, Error **errp);
/**
* block_job_remove_all_bdrv:
* @job: The block job
*
* Remove all BlockDriverStates from the list of nodes that are involved in the
* job. This removes the blockers added with block_job_add_bdrv().
*/
void block_job_remove_all_bdrv(BlockJob *job);
/**
* block_job_has_bdrv:
* @job: The block job
*
* Searches for @bs in the list of nodes that are involved in the
* job.
*/
bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs);
/**
* block_job_set_speed_locked:
* @job: The job to set the speed for.
* @speed: The new value
* @errp: Error object.
*
* Set a rate-limiting parameter for the job; the actual meaning may
* vary depending on the job type.
*
* Called with job lock held, but might release it temporarily.
*/
bool block_job_set_speed_locked(BlockJob *job, int64_t speed, Error **errp);
/**
* block_job_query_locked:
* @job: The job to get information about.
*
* Return information about a job.
*
* Called with job lock held.
*/
BlockJobInfo *block_job_query_locked(BlockJob *job, Error **errp);
/**
* block_job_iostatus_reset_locked:
* @job: The job whose I/O status should be reset.
*
* Reset I/O status on @job and on BlockDriverState objects it uses,
* other than job->blk.
*
* Called with job lock held.
*/
void block_job_iostatus_reset_locked(BlockJob *job);
/*
* block_job_get_aio_context:
*
* Returns aio context associated with a block job.
*/
AioContext *block_job_get_aio_context(BlockJob *job);
/*
* Common functions that are neither I/O nor Global State.
*
* See include/block/block-common.h for more information about
* the Common API.
*/
/**
* block_job_is_internal:
* @job: The job to determine if it is user-visible or not.
*
* Returns true if the job should not be visible to the management layer.
*/
bool block_job_is_internal(BlockJob *job);
/**
* block_job_driver:
*
* Returns the driver associated with a block job.
*/
const BlockJobDriver *block_job_driver(BlockJob *job);
#endif
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