aboutsummaryrefslogtreecommitdiff
path: root/include/block/blockjob.h
blob: 09e6bb42bf8fd071e32132a90b08e98d0288785c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * 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 */
    Job job;

    /** The job type, including the job vtable.  */
    const BlockJobDriver *driver;

    /** The block device on which the job is operating.  */
    BlockBackend *blk;

    /**
     * Set to true when the job is ready to be completed.
     */
    bool ready;

    /** Status that is published by the query-block-jobs QMP API */
    BlockDeviceIoStatus iostatus;

    /** Offset that is published by the query-block-jobs QMP API */
    int64_t offset;

    /** Length that is published by the query-block-jobs QMP API */
    int64_t len;

    /** Speed that was set with @block_job_set_speed.  */
    int64_t speed;

    /** Rate limiting data structure for implementing @speed. */
    RateLimit limit;

    /** Block other operations when block job is running */
    Error *blocker;

    /** 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;

    /** BlockDriverStates that are involved in this block job */
    GSList *nodes;
} BlockJob;

/**
 * block_job_next:
 * @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.
 */
BlockJob *block_job_next(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.
 */
BlockJob *block_job_get(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_set_speed:
 * @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.
 */
void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp);

/**
 * block_job_cancel:
 * @job: The job to be canceled.
 * @force: Quit a job without waiting for data to be in sync.
 *
 * Asynchronously cancel the specified job.
 */
void block_job_cancel(BlockJob *job, bool force);

/**
 * block_job_dismiss:
 * @job: The job to be dismissed.
 * @errp: Error object.
 *
 * Remove a concluded job from the query list.
 */
void block_job_dismiss(BlockJob **job, Error **errp);

/**
 * block_job_progress_update:
 * @job: The job that has made progress
 * @done: How much progress the job made
 *
 * Updates the progress counter of the job.
 */
void block_job_progress_update(BlockJob *job, uint64_t done);

/**
 * block_job_progress_set_remaining:
 * @job: The job whose expected progress end value is set
 * @remaining: Expected end value of the progress counter of the job
 *
 * Sets the expected end value of the progress counter of a job so that a
 * completion percentage can be calculated when the progress is updated.
 */
void block_job_progress_set_remaining(BlockJob *job, uint64_t remaining);

/**
 * block_job_query:
 * @job: The job to get information about.
 *
 * Return information about a job.
 */
BlockJobInfo *block_job_query(BlockJob *job, Error **errp);

/**
 * block_job_user_cancel:
 * @job: The job to be cancelled.
 * @force: Quit a job without waiting for data to be in sync.
 *
 * Cancels the specified job, but may refuse to do so if the
 * operation isn't currently meaningful.
 */
void block_job_user_cancel(BlockJob *job, bool force, Error **errp);

/**
 * block_job_cancel_sync:
 * @job: The job to be canceled.
 *
 * Synchronously cancel the job.  The completion callback is called
 * before the function returns.  The job may actually complete
 * instead of canceling itself; the circumstances under which this
 * happens depend on the kind of job that is active.
 *
 * Returns the return value from the job if the job actually completed
 * during the call, or -ECANCELED if it was canceled.
 */
int block_job_cancel_sync(BlockJob *job);

/**
 * block_job_cancel_sync_all:
 *
 * Synchronously cancels all jobs using block_job_cancel_sync().
 */
void block_job_cancel_sync_all(void);

/**
 * block_job_complete_sync:
 * @job: The job to be completed.
 * @errp: Error object which may be set by block_job_complete(); this is not
 *        necessarily set on every error, the job return value has to be
 *        checked as well.
 *
 * Synchronously complete the job.  The completion callback is called before the
 * function returns, unless it is NULL (which is permissible when using this
 * function).
 *
 * Returns the return value from the job.
 */
int block_job_complete_sync(BlockJob *job, Error **errp);

/**
 * block_job_iostatus_reset:
 * @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.
 */
void block_job_iostatus_reset(BlockJob *job);

/**
 * 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