bb0c940993
In job_finish_sync job_enter should be enough for a job to make some progress and draining is a wrong tool for it. So use job_enter directly here and drop job_drain with all related staff not used more. Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Tested-by: John Snow <jsnow@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
121 lines
4.4 KiB
C
121 lines
4.4 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_INT_H
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#define BLOCKJOB_INT_H
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#include "block/blockjob.h"
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#include "block/block.h"
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/**
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* BlockJobDriver:
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*
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* A class type for block job driver.
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*/
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struct BlockJobDriver {
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/** Generic JobDriver callbacks and settings */
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JobDriver job_driver;
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/*
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* Returns whether the job has pending requests for the child or will
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* submit new requests before the next pause point. This callback is polled
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* in the context of draining a job node after requesting that the job be
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* paused, until all activity on the child has stopped.
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*/
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bool (*drained_poll)(BlockJob *job);
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/*
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* If the callback is not NULL, it will be invoked before the job is
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* resumed in a new AioContext. This is the place to move any resources
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* besides job->blk to the new AioContext.
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*/
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void (*attached_aio_context)(BlockJob *job, AioContext *new_context);
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};
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/**
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* block_job_create:
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* @job_id: The id of the newly-created job, or %NULL to have one
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* generated automatically.
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* @driver: The class object for the newly-created job.
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* @txn: The transaction this job belongs to, if any. %NULL otherwise.
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* @bs: The block
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* @perm, @shared_perm: Permissions to request for @bs
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @flags: Creation flags for the Block Job. See @JobCreateFlags.
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* @cb: Completion function for the job.
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* @opaque: Opaque pointer value passed to @cb.
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* @errp: Error object.
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*
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* Create a new long-running block device job and return it. The job
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* will call @cb asynchronously when the job completes. Note that
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* @bs may have been closed at the time the @cb it is called. If
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* this is the case, the job may be reported as either cancelled or
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* completed.
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*
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* This function is not part of the public job interface; it should be
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* called from a wrapper that is specific to the job type.
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*/
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void *block_job_create(const char *job_id, const BlockJobDriver *driver,
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JobTxn *txn, BlockDriverState *bs, uint64_t perm,
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uint64_t shared_perm, int64_t speed, int flags,
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BlockCompletionFunc *cb, void *opaque, Error **errp);
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/**
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* block_job_free:
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* Callback to be used for JobDriver.free in all block jobs. Frees block job
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* specific resources in @job.
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*/
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void block_job_free(Job *job);
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/**
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* block_job_user_resume:
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* Callback to be used for JobDriver.user_resume in all block jobs. Resets the
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* iostatus when the user resumes @job.
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*/
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void block_job_user_resume(Job *job);
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/**
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* block_job_ratelimit_get_delay:
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*
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* Calculate and return delay for the next request in ns. See the documentation
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* of ratelimit_calculate_delay() for details.
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*/
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int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n);
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/**
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* block_job_error_action:
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* @job: The job to signal an error for.
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* @on_err: The error action setting.
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* @is_read: Whether the operation was a read.
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* @error: The error that was reported.
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*
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* Report an I/O error for a block job and possibly stop the VM. Return the
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* action that was selected based on @on_err and @error.
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*/
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BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
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int is_read, int error);
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#endif
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