1 /* 2 * Declarations for long-running block device operations 3 * 4 * Copyright (c) 2011 IBM Corp. 5 * Copyright (c) 2012 Red Hat, Inc. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #ifndef BLOCKJOB_H 27 #define BLOCKJOB_H 28 29 #include "qemu/job.h" 30 #include "block/block.h" 31 #include "qemu/ratelimit.h" 32 33 #define BLOCK_JOB_SLICE_TIME 100000000ULL /* ns */ 34 35 typedef struct BlockJobDriver BlockJobDriver; 36 37 /** 38 * BlockJob: 39 * 40 * Long-running operation on a BlockDriverState. 41 */ 42 typedef struct BlockJob { 43 /** Data belonging to the generic Job infrastructure */ 44 Job job; 45 46 /** The block device on which the job is operating. */ 47 BlockBackend *blk; 48 49 /** Status that is published by the query-block-jobs QMP API */ 50 BlockDeviceIoStatus iostatus; 51 52 /** Speed that was set with @block_job_set_speed. */ 53 int64_t speed; 54 55 /** Rate limiting data structure for implementing @speed. */ 56 RateLimit limit; 57 58 /** Block other operations when block job is running */ 59 Error *blocker; 60 61 /** Called when a cancelled job is finalised. */ 62 Notifier finalize_cancelled_notifier; 63 64 /** Called when a successfully completed job is finalised. */ 65 Notifier finalize_completed_notifier; 66 67 /** Called when the job transitions to PENDING */ 68 Notifier pending_notifier; 69 70 /** Called when the job transitions to READY */ 71 Notifier ready_notifier; 72 73 /** BlockDriverStates that are involved in this block job */ 74 GSList *nodes; 75 } BlockJob; 76 77 /** 78 * block_job_next: 79 * @job: A block job, or %NULL. 80 * 81 * Get the next element from the list of block jobs after @job, or the 82 * first one if @job is %NULL. 83 * 84 * Returns the requested job, or %NULL if there are no more jobs left. 85 */ 86 BlockJob *block_job_next(BlockJob *job); 87 88 /** 89 * block_job_get: 90 * @id: The id of the block job. 91 * 92 * Get the block job identified by @id (which must not be %NULL). 93 * 94 * Returns the requested job, or %NULL if it doesn't exist. 95 */ 96 BlockJob *block_job_get(const char *id); 97 98 /** 99 * block_job_add_bdrv: 100 * @job: A block job 101 * @name: The name to assign to the new BdrvChild 102 * @bs: A BlockDriverState that is involved in @job 103 * @perm, @shared_perm: Permissions to request on the node 104 * 105 * Add @bs to the list of BlockDriverState that are involved in 106 * @job. This means that all operations will be blocked on @bs while 107 * @job exists. 108 */ 109 int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs, 110 uint64_t perm, uint64_t shared_perm, Error **errp); 111 112 /** 113 * block_job_remove_all_bdrv: 114 * @job: The block job 115 * 116 * Remove all BlockDriverStates from the list of nodes that are involved in the 117 * job. This removes the blockers added with block_job_add_bdrv(). 118 */ 119 void block_job_remove_all_bdrv(BlockJob *job); 120 121 /** 122 * block_job_set_speed: 123 * @job: The job to set the speed for. 124 * @speed: The new value 125 * @errp: Error object. 126 * 127 * Set a rate-limiting parameter for the job; the actual meaning may 128 * vary depending on the job type. 129 */ 130 void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp); 131 132 /** 133 * block_job_query: 134 * @job: The job to get information about. 135 * 136 * Return information about a job. 137 */ 138 BlockJobInfo *block_job_query(BlockJob *job, Error **errp); 139 140 /** 141 * block_job_iostatus_reset: 142 * @job: The job whose I/O status should be reset. 143 * 144 * Reset I/O status on @job and on BlockDriverState objects it uses, 145 * other than job->blk. 146 */ 147 void block_job_iostatus_reset(BlockJob *job); 148 149 /** 150 * block_job_is_internal: 151 * @job: The job to determine if it is user-visible or not. 152 * 153 * Returns true if the job should not be visible to the management layer. 154 */ 155 bool block_job_is_internal(BlockJob *job); 156 157 /** 158 * block_job_driver: 159 * 160 * Returns the driver associated with a block job. 161 */ 162 const BlockJobDriver *block_job_driver(BlockJob *job); 163 164 #endif 165