330 lines
15 KiB
C
330 lines
15 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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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 BLOCK_INT_GLOBAL_STATE_H
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#define BLOCK_INT_GLOBAL_STATE_H
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#include "block_int-common.h"
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/*
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* Global state (GS) API. These functions run under the BQL.
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*
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* See include/block/block-global-state.h for more information about
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* the GS API.
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*/
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/**
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* stream_start:
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* @job_id: The id of the newly-created job, or %NULL to use the
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* device name of @bs.
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* @bs: Block device to operate on.
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* @base: Block device that will become the new base, or %NULL to
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* flatten the whole backing file chain onto @bs.
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* @backing_file_str: The file name that will be written to @bs as the
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* the new backing file if the job completes. Ignored if @base is %NULL.
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* @creation_flags: Flags that control the behavior of the Job lifetime.
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* See @BlockJobCreateFlags
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @on_error: The action to take upon error.
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* @filter_node_name: The node name that should be assigned to the filter
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* driver that the stream job inserts into the graph above
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* @bs. NULL means that a node name should be autogenerated.
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* @errp: Error object.
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*
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* Start a streaming operation on @bs. Clusters that are unallocated
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* in @bs, but allocated in any image between @base and @bs (both
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* exclusive) will be written to @bs. At the end of a successful
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* streaming job, the backing file of @bs will be changed to
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* @backing_file_str in the written image and to @base in the live
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* BlockDriverState.
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*/
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void stream_start(const char *job_id, BlockDriverState *bs,
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BlockDriverState *base, const char *backing_file_str,
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BlockDriverState *bottom,
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int creation_flags, int64_t speed,
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BlockdevOnError on_error,
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const char *filter_node_name,
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Error **errp);
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/**
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* commit_start:
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* @job_id: The id of the newly-created job, or %NULL to use the
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* device name of @bs.
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* @bs: Active block device.
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* @top: Top block device to be committed.
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* @base: Block device that will be written into, and become the new top.
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* @creation_flags: Flags that control the behavior of the Job lifetime.
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* See @BlockJobCreateFlags
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @on_error: The action to take upon error.
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* @backing_file_str: String to use as the backing file in @top's overlay
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* @filter_node_name: The node name that should be assigned to the filter
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* driver that the commit job inserts into the graph above @top. NULL means
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* that a node name should be autogenerated.
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* @errp: Error object.
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*
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*/
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void commit_start(const char *job_id, BlockDriverState *bs,
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BlockDriverState *base, BlockDriverState *top,
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int creation_flags, int64_t speed,
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BlockdevOnError on_error, const char *backing_file_str,
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const char *filter_node_name, Error **errp);
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/**
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* commit_active_start:
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* @job_id: The id of the newly-created job, or %NULL to use the
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* device name of @bs.
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* @bs: Active block device to be committed.
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* @base: Block device that will be written into, and become the new top.
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* @creation_flags: Flags that control the behavior of the Job lifetime.
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* See @BlockJobCreateFlags
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @on_error: The action to take upon error.
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* @filter_node_name: The node name that should be assigned to the filter
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* driver that the commit job inserts into the graph above @bs. NULL means that
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* a node name should be autogenerated.
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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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* @auto_complete: Auto complete the job.
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* @errp: Error object.
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*
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*/
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BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
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BlockDriverState *base, int creation_flags,
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int64_t speed, BlockdevOnError on_error,
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const char *filter_node_name,
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BlockCompletionFunc *cb, void *opaque,
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bool auto_complete, Error **errp);
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/*
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* mirror_start:
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* @job_id: The id of the newly-created job, or %NULL to use the
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* device name of @bs.
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* @bs: Block device to operate on.
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* @target: Block device to write to.
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* @replaces: Block graph node name to replace once the mirror is done. Can
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* only be used when full mirroring is selected.
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* @creation_flags: Flags that control the behavior of the Job lifetime.
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* See @BlockJobCreateFlags
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @granularity: The chosen granularity for the dirty bitmap.
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* @buf_size: The amount of data that can be in flight at one time.
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* @mode: Whether to collapse all images in the chain to the target.
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* @backing_mode: How to establish the target's backing chain after completion.
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* @zero_target: Whether the target should be explicitly zero-initialized
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* @on_source_error: The action to take upon error reading from the source.
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* @on_target_error: The action to take upon error writing to the target.
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* @unmap: Whether to unmap target where source sectors only contain zeroes.
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* @filter_node_name: The node name that should be assigned to the filter
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* driver that the mirror job inserts into the graph above @bs. NULL means that
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* a node name should be autogenerated.
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* @copy_mode: When to trigger writes to the target.
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* @errp: Error object.
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*
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* Start a mirroring operation on @bs. Clusters that are allocated
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* in @bs will be written to @target until the job is cancelled or
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* manually completed. At the end of a successful mirroring job,
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* @bs will be switched to read from @target.
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*/
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void mirror_start(const char *job_id, BlockDriverState *bs,
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BlockDriverState *target, const char *replaces,
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int creation_flags, int64_t speed,
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uint32_t granularity, int64_t buf_size,
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MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
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bool zero_target,
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BlockdevOnError on_source_error,
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BlockdevOnError on_target_error,
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bool unmap, const char *filter_node_name,
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MirrorCopyMode copy_mode, Error **errp);
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/*
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* backup_job_create:
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* @job_id: The id of the newly-created job, or %NULL to use the
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* device name of @bs.
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* @bs: Block device to operate on.
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* @target: Block device to write to.
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* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
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* @sync_mode: What parts of the disk image should be copied to the destination.
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* @sync_bitmap: The dirty bitmap if sync_mode is 'bitmap' or 'incremental'
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* @bitmap_mode: The bitmap synchronization policy to use.
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* @perf: Performance options. All actual fields assumed to be present,
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* all ".has_*" fields are ignored.
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* @on_source_error: The action to take upon error reading from the source.
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* @on_target_error: The action to take upon error writing to the target.
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* @creation_flags: Flags that control the behavior of the Job lifetime.
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* See @BlockJobCreateFlags
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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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* @txn: Transaction that this job is part of (may be NULL).
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*
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* Create a backup operation on @bs. Clusters in @bs are written to @target
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* until the job is cancelled or manually completed.
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*/
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BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
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BlockDriverState *target, int64_t speed,
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MirrorSyncMode sync_mode,
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BdrvDirtyBitmap *sync_bitmap,
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BitmapSyncMode bitmap_mode,
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bool compress,
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const char *filter_node_name,
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BackupPerf *perf,
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BlockdevOnError on_source_error,
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BlockdevOnError on_target_error,
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int creation_flags,
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BlockCompletionFunc *cb, void *opaque,
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JobTxn *txn, Error **errp);
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BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
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const char *child_name,
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const BdrvChildClass *child_class,
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BdrvChildRole child_role,
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uint64_t perm, uint64_t shared_perm,
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void *opaque, Error **errp);
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void bdrv_root_unref_child(BdrvChild *child);
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void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
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uint64_t *shared_perm);
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/**
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* Sets a BdrvChild's permissions. Avoid if the parent is a BDS; use
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* bdrv_child_refresh_perms() instead and make the parent's
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* .bdrv_child_perm() implementation return the correct values.
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*/
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int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
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Error **errp);
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/**
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* Calls bs->drv->bdrv_child_perm() and updates the child's permission
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* masks with the result.
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* Drivers should invoke this function whenever an event occurs that
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* makes their .bdrv_child_perm() implementation return different
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* values than before, but which will not result in the block layer
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* automatically refreshing the permissions.
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*/
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int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
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bool bdrv_recurse_can_replace(BlockDriverState *bs,
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BlockDriverState *to_replace);
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/*
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* Default implementation for BlockDriver.bdrv_child_perm() that can
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* be used by block filters and image formats, as long as they use the
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* child_of_bds child class and set an appropriate BdrvChildRole.
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*/
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void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c,
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BdrvChildRole role, BlockReopenQueue *reopen_queue,
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uint64_t perm, uint64_t shared,
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uint64_t *nperm, uint64_t *nshared);
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void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp);
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bool blk_dev_has_removable_media(BlockBackend *blk);
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void blk_dev_eject_request(BlockBackend *blk, bool force);
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bool blk_dev_is_medium_locked(BlockBackend *blk);
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void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup);
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void bdrv_set_monitor_owned(BlockDriverState *bs);
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void blockdev_close_all_bdrv_states(void);
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BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp);
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/**
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* Simple implementation of bdrv_co_create_opts for protocol drivers
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* which only support creation via opening a file
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* (usually existing raw storage device)
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*/
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int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv,
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const char *filename,
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QemuOpts *opts,
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Error **errp);
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BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
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const char *name,
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BlockDriverState **pbs,
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Error **errp);
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BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target,
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BlockDirtyBitmapOrStrList *bms,
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HBitmap **backup, Error **errp);
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BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
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bool release,
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BlockDriverState **bitmap_bs,
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Error **errp);
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BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs);
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/**
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* bdrv_add_aio_context_notifier:
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*
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* If a long-running job intends to be always run in the same AioContext as a
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* certain BDS, it may use this function to be notified of changes regarding the
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* association of the BDS to an AioContext.
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*
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* attached_aio_context() is called after the target BDS has been attached to a
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* new AioContext; detach_aio_context() is called before the target BDS is being
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* detached from its old AioContext.
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*/
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void bdrv_add_aio_context_notifier(BlockDriverState *bs,
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void (*attached_aio_context)(AioContext *new_context, void *opaque),
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void (*detach_aio_context)(void *opaque), void *opaque);
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/**
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* bdrv_remove_aio_context_notifier:
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*
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* Unsubscribe of change notifications regarding the BDS's AioContext. The
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* parameters given here have to be the same as those given to
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* bdrv_add_aio_context_notifier().
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*/
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void bdrv_remove_aio_context_notifier(BlockDriverState *bs,
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void (*aio_context_attached)(AioContext *,
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void *),
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void (*aio_context_detached)(void *),
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void *opaque);
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/**
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* End all quiescent sections started by bdrv_drain_all_begin(). This is
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* needed when deleting a BDS before bdrv_drain_all_end() is called.
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*
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* NOTE: this is an internal helper for bdrv_close() *only*. No one else
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* should call it.
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*/
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void bdrv_drain_all_end_quiesce(BlockDriverState *bs);
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/**
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* Make sure that the function is running under both drain and BQL.
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* The latter protects from concurrent writings
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* from the GS API, while the former prevents concurrent reads
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* from I/O.
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*/
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static inline void assert_bdrv_graph_writable(BlockDriverState *bs)
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{
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/*
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* TODO: this function is incomplete. Because the users of this
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* assert lack the necessary drains, check only for BQL.
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* Once the necessary drains are added,
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* assert also for qatomic_read(&bs->quiesce_counter) > 0
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*/
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assert(qemu_in_main_thread());
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}
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#endif /* BLOCK_INT_GLOBAL_STATE */
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