2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #ifndef BLOCK_INT_GLOBAL_STATE_H
26 #define BLOCK_INT_GLOBAL_STATE_H
28 #include "block_int-common.h"
31 * Global state (GS) API. These functions run under the BQL.
33 * See include/block/block-global-state.h for more information about
39 * @job_id: The id of the newly-created job, or %NULL to use the
41 * @bs: Block device to operate on.
42 * @base: Block device that will become the new base, or %NULL to
43 * flatten the whole backing file chain onto @bs.
44 * @backing_file_str: The file name that will be written to @bs as the
45 * the new backing file if the job completes. Ignored if @base is %NULL.
46 * @creation_flags: Flags that control the behavior of the Job lifetime.
47 * See @BlockJobCreateFlags
48 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
49 * @on_error: The action to take upon error.
50 * @filter_node_name: The node name that should be assigned to the filter
51 * driver that the stream job inserts into the graph above
52 * @bs. NULL means that a node name should be autogenerated.
53 * @errp: Error object.
55 * Start a streaming operation on @bs. Clusters that are unallocated
56 * in @bs, but allocated in any image between @base and @bs (both
57 * exclusive) will be written to @bs. At the end of a successful
58 * streaming job, the backing file of @bs will be changed to
59 * @backing_file_str in the written image and to @base in the live
62 void stream_start(const char *job_id
, BlockDriverState
*bs
,
63 BlockDriverState
*base
, const char *backing_file_str
,
64 BlockDriverState
*bottom
,
65 int creation_flags
, int64_t speed
,
66 BlockdevOnError on_error
,
67 const char *filter_node_name
,
72 * @job_id: The id of the newly-created job, or %NULL to use the
74 * @bs: Active block device.
75 * @top: Top block device to be committed.
76 * @base: Block device that will be written into, and become the new top.
77 * @creation_flags: Flags that control the behavior of the Job lifetime.
78 * See @BlockJobCreateFlags
79 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
80 * @on_error: The action to take upon error.
81 * @backing_file_str: String to use as the backing file in @top's overlay
82 * @filter_node_name: The node name that should be assigned to the filter
83 * driver that the commit job inserts into the graph above @top. NULL means
84 * that a node name should be autogenerated.
85 * @errp: Error object.
88 void commit_start(const char *job_id
, BlockDriverState
*bs
,
89 BlockDriverState
*base
, BlockDriverState
*top
,
90 int creation_flags
, int64_t speed
,
91 BlockdevOnError on_error
, const char *backing_file_str
,
92 const char *filter_node_name
, Error
**errp
);
94 * commit_active_start:
95 * @job_id: The id of the newly-created job, or %NULL to use the
97 * @bs: Active block device to be committed.
98 * @base: Block device that will be written into, and become the new top.
99 * @creation_flags: Flags that control the behavior of the Job lifetime.
100 * See @BlockJobCreateFlags
101 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
102 * @on_error: The action to take upon error.
103 * @filter_node_name: The node name that should be assigned to the filter
104 * driver that the commit job inserts into the graph above @bs. NULL means that
105 * a node name should be autogenerated.
106 * @cb: Completion function for the job.
107 * @opaque: Opaque pointer value passed to @cb.
108 * @auto_complete: Auto complete the job.
109 * @errp: Error object.
112 BlockJob
*commit_active_start(const char *job_id
, BlockDriverState
*bs
,
113 BlockDriverState
*base
, int creation_flags
,
114 int64_t speed
, BlockdevOnError on_error
,
115 const char *filter_node_name
,
116 BlockCompletionFunc
*cb
, void *opaque
,
117 bool auto_complete
, Error
**errp
);
120 * @job_id: The id of the newly-created job, or %NULL to use the
121 * device name of @bs.
122 * @bs: Block device to operate on.
123 * @target: Block device to write to.
124 * @replaces: Block graph node name to replace once the mirror is done. Can
125 * only be used when full mirroring is selected.
126 * @creation_flags: Flags that control the behavior of the Job lifetime.
127 * See @BlockJobCreateFlags
128 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
129 * @granularity: The chosen granularity for the dirty bitmap.
130 * @buf_size: The amount of data that can be in flight at one time.
131 * @mode: Whether to collapse all images in the chain to the target.
132 * @backing_mode: How to establish the target's backing chain after completion.
133 * @zero_target: Whether the target should be explicitly zero-initialized
134 * @on_source_error: The action to take upon error reading from the source.
135 * @on_target_error: The action to take upon error writing to the target.
136 * @unmap: Whether to unmap target where source sectors only contain zeroes.
137 * @filter_node_name: The node name that should be assigned to the filter
138 * driver that the mirror job inserts into the graph above @bs. NULL means that
139 * a node name should be autogenerated.
140 * @copy_mode: When to trigger writes to the target.
141 * @errp: Error object.
143 * Start a mirroring operation on @bs. Clusters that are allocated
144 * in @bs will be written to @target until the job is cancelled or
145 * manually completed. At the end of a successful mirroring job,
146 * @bs will be switched to read from @target.
148 void mirror_start(const char *job_id
, BlockDriverState
*bs
,
149 BlockDriverState
*target
, const char *replaces
,
150 int creation_flags
, int64_t speed
,
151 uint32_t granularity
, int64_t buf_size
,
152 MirrorSyncMode mode
, BlockMirrorBackingMode backing_mode
,
154 BlockdevOnError on_source_error
,
155 BlockdevOnError on_target_error
,
156 bool unmap
, const char *filter_node_name
,
157 MirrorCopyMode copy_mode
, Error
**errp
);
161 * @job_id: The id of the newly-created job, or %NULL to use the
162 * device name of @bs.
163 * @bs: Block device to operate on.
164 * @target: Block device to write to.
165 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
166 * @sync_mode: What parts of the disk image should be copied to the destination.
167 * @sync_bitmap: The dirty bitmap if sync_mode is 'bitmap' or 'incremental'
168 * @bitmap_mode: The bitmap synchronization policy to use.
169 * @perf: Performance options. All actual fields assumed to be present,
170 * all ".has_*" fields are ignored.
171 * @on_source_error: The action to take upon error reading from the source.
172 * @on_target_error: The action to take upon error writing to the target.
173 * @creation_flags: Flags that control the behavior of the Job lifetime.
174 * See @BlockJobCreateFlags
175 * @cb: Completion function for the job.
176 * @opaque: Opaque pointer value passed to @cb.
177 * @txn: Transaction that this job is part of (may be NULL).
179 * Create a backup operation on @bs. Clusters in @bs are written to @target
180 * until the job is cancelled or manually completed.
182 BlockJob
*backup_job_create(const char *job_id
, BlockDriverState
*bs
,
183 BlockDriverState
*target
, int64_t speed
,
184 MirrorSyncMode sync_mode
,
185 BdrvDirtyBitmap
*sync_bitmap
,
186 BitmapSyncMode bitmap_mode
,
188 const char *filter_node_name
,
190 BlockdevOnError on_source_error
,
191 BlockdevOnError on_target_error
,
193 BlockCompletionFunc
*cb
, void *opaque
,
194 JobTxn
*txn
, Error
**errp
);
196 BdrvChild
*bdrv_root_attach_child(BlockDriverState
*child_bs
,
197 const char *child_name
,
198 const BdrvChildClass
*child_class
,
199 BdrvChildRole child_role
,
200 uint64_t perm
, uint64_t shared_perm
,
201 void *opaque
, Error
**errp
);
202 void bdrv_root_unref_child(BdrvChild
*child
);
204 void bdrv_get_cumulative_perm(BlockDriverState
*bs
, uint64_t *perm
,
205 uint64_t *shared_perm
);
208 * Sets a BdrvChild's permissions. Avoid if the parent is a BDS; use
209 * bdrv_child_refresh_perms() instead and make the parent's
210 * .bdrv_child_perm() implementation return the correct values.
212 int bdrv_child_try_set_perm(BdrvChild
*c
, uint64_t perm
, uint64_t shared
,
216 * Calls bs->drv->bdrv_child_perm() and updates the child's permission
217 * masks with the result.
218 * Drivers should invoke this function whenever an event occurs that
219 * makes their .bdrv_child_perm() implementation return different
220 * values than before, but which will not result in the block layer
221 * automatically refreshing the permissions.
223 int bdrv_child_refresh_perms(BlockDriverState
*bs
, BdrvChild
*c
, Error
**errp
);
225 bool bdrv_recurse_can_replace(BlockDriverState
*bs
,
226 BlockDriverState
*to_replace
);
229 * Default implementation for BlockDriver.bdrv_child_perm() that can
230 * be used by block filters and image formats, as long as they use the
231 * child_of_bds child class and set an appropriate BdrvChildRole.
233 void bdrv_default_perms(BlockDriverState
*bs
, BdrvChild
*c
,
234 BdrvChildRole role
, BlockReopenQueue
*reopen_queue
,
235 uint64_t perm
, uint64_t shared
,
236 uint64_t *nperm
, uint64_t *nshared
);
238 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
, Error
**errp
);
239 bool blk_dev_has_removable_media(BlockBackend
*blk
);
240 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
241 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
243 void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap
*bitmap
, HBitmap
*backup
);
245 void bdrv_set_monitor_owned(BlockDriverState
*bs
);
247 void blockdev_close_all_bdrv_states(void);
249 BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
);
252 * Simple implementation of bdrv_co_create_opts for protocol drivers
253 * which only support creation via opening a file
254 * (usually existing raw storage device)
256 int coroutine_fn
bdrv_co_create_opts_simple(BlockDriver
*drv
,
257 const char *filename
,
261 BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
263 BlockDriverState
**pbs
,
265 BdrvDirtyBitmap
*block_dirty_bitmap_merge(const char *node
, const char *target
,
266 BlockDirtyBitmapOrStrList
*bms
,
267 HBitmap
**backup
, Error
**errp
);
268 BdrvDirtyBitmap
*block_dirty_bitmap_remove(const char *node
, const char *name
,
270 BlockDriverState
**bitmap_bs
,
274 BlockDriverState
*bdrv_skip_implicit_filters(BlockDriverState
*bs
);
277 * bdrv_add_aio_context_notifier:
279 * If a long-running job intends to be always run in the same AioContext as a
280 * certain BDS, it may use this function to be notified of changes regarding the
281 * association of the BDS to an AioContext.
283 * attached_aio_context() is called after the target BDS has been attached to a
284 * new AioContext; detach_aio_context() is called before the target BDS is being
285 * detached from its old AioContext.
287 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
288 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
289 void (*detach_aio_context
)(void *opaque
), void *opaque
);
292 * bdrv_remove_aio_context_notifier:
294 * Unsubscribe of change notifications regarding the BDS's AioContext. The
295 * parameters given here have to be the same as those given to
296 * bdrv_add_aio_context_notifier().
298 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
299 void (*aio_context_attached
)(AioContext
*,
301 void (*aio_context_detached
)(void *),
305 * End all quiescent sections started by bdrv_drain_all_begin(). This is
306 * needed when deleting a BDS before bdrv_drain_all_end() is called.
308 * NOTE: this is an internal helper for bdrv_close() *only*. No one else
311 void bdrv_drain_all_end_quiesce(BlockDriverState
*bs
);
313 #endif /* BLOCK_INT_GLOBAL_STATE_H */