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1 | /* |
2 | * QEMU System Emulator block driver | |
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 | #include "config-host.h" | |
27 | #include "qemu-common.h" | |
28 | #include "trace.h" | |
29 | #include "monitor.h" | |
30 | #include "block.h" | |
31 | #include "blockjob.h" | |
32 | #include "block_int.h" | |
33 | #include "qjson.h" | |
34 | #include "qemu-coroutine.h" | |
35 | #include "qmp-commands.h" | |
36 | #include "qemu-timer.h" | |
37 | ||
38 | void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, | |
39 | int64_t speed, BlockDriverCompletionFunc *cb, | |
40 | void *opaque, Error **errp) | |
41 | { | |
42 | BlockJob *job; | |
43 | ||
44 | if (bs->job || bdrv_in_use(bs)) { | |
45 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); | |
46 | return NULL; | |
47 | } | |
48 | bdrv_set_in_use(bs, 1); | |
49 | ||
50 | job = g_malloc0(job_type->instance_size); | |
51 | job->job_type = job_type; | |
52 | job->bs = bs; | |
53 | job->cb = cb; | |
54 | job->opaque = opaque; | |
55 | job->busy = true; | |
56 | bs->job = job; | |
57 | ||
58 | /* Only set speed when necessary to avoid NotSupported error */ | |
59 | if (speed != 0) { | |
60 | Error *local_err = NULL; | |
61 | ||
62 | block_job_set_speed(job, speed, &local_err); | |
63 | if (error_is_set(&local_err)) { | |
64 | bs->job = NULL; | |
65 | g_free(job); | |
66 | bdrv_set_in_use(bs, 0); | |
67 | error_propagate(errp, local_err); | |
68 | return NULL; | |
69 | } | |
70 | } | |
71 | return job; | |
72 | } | |
73 | ||
74 | void block_job_complete(BlockJob *job, int ret) | |
75 | { | |
76 | BlockDriverState *bs = job->bs; | |
77 | ||
78 | assert(bs->job == job); | |
79 | job->cb(job->opaque, ret); | |
80 | bs->job = NULL; | |
81 | g_free(job); | |
82 | bdrv_set_in_use(bs, 0); | |
83 | } | |
84 | ||
85 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) | |
86 | { | |
87 | Error *local_err = NULL; | |
88 | ||
89 | if (!job->job_type->set_speed) { | |
90 | error_set(errp, QERR_NOT_SUPPORTED); | |
91 | return; | |
92 | } | |
93 | job->job_type->set_speed(job, speed, &local_err); | |
94 | if (error_is_set(&local_err)) { | |
95 | error_propagate(errp, local_err); | |
96 | return; | |
97 | } | |
98 | ||
99 | job->speed = speed; | |
100 | } | |
101 | ||
102 | void block_job_cancel(BlockJob *job) | |
103 | { | |
104 | job->cancelled = true; | |
105 | if (job->co && !job->busy) { | |
106 | qemu_coroutine_enter(job->co, NULL); | |
107 | } | |
108 | } | |
109 | ||
110 | bool block_job_is_cancelled(BlockJob *job) | |
111 | { | |
112 | return job->cancelled; | |
113 | } | |
114 | ||
115 | struct BlockCancelData { | |
116 | BlockJob *job; | |
117 | BlockDriverCompletionFunc *cb; | |
118 | void *opaque; | |
119 | bool cancelled; | |
120 | int ret; | |
121 | }; | |
122 | ||
123 | static void block_job_cancel_cb(void *opaque, int ret) | |
124 | { | |
125 | struct BlockCancelData *data = opaque; | |
126 | ||
127 | data->cancelled = block_job_is_cancelled(data->job); | |
128 | data->ret = ret; | |
129 | data->cb(data->opaque, ret); | |
130 | } | |
131 | ||
132 | int block_job_cancel_sync(BlockJob *job) | |
133 | { | |
134 | struct BlockCancelData data; | |
135 | BlockDriverState *bs = job->bs; | |
136 | ||
137 | assert(bs->job == job); | |
138 | ||
139 | /* Set up our own callback to store the result and chain to | |
140 | * the original callback. | |
141 | */ | |
142 | data.job = job; | |
143 | data.cb = job->cb; | |
144 | data.opaque = job->opaque; | |
145 | data.ret = -EINPROGRESS; | |
146 | job->cb = block_job_cancel_cb; | |
147 | job->opaque = &data; | |
148 | block_job_cancel(job); | |
149 | while (data.ret == -EINPROGRESS) { | |
150 | qemu_aio_wait(); | |
151 | } | |
152 | return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; | |
153 | } | |
154 | ||
155 | void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns) | |
156 | { | |
157 | /* Check cancellation *before* setting busy = false, too! */ | |
158 | if (!block_job_is_cancelled(job)) { | |
159 | job->busy = false; | |
160 | co_sleep_ns(clock, ns); | |
161 | job->busy = true; | |
162 | } | |
163 | } | |
30e628b7 PB |
164 | |
165 | BlockJobInfo *block_job_query(BlockJob *job) | |
166 | { | |
167 | BlockJobInfo *info = g_new0(BlockJobInfo, 1); | |
168 | info->type = g_strdup(job->job_type->job_type); | |
169 | info->device = g_strdup(bdrv_get_device_name(job->bs)); | |
170 | info->len = job->len; | |
8d65883f | 171 | info->busy = job->busy; |
30e628b7 PB |
172 | info->offset = job->offset; |
173 | info->speed = job->speed; | |
174 | return info; | |
175 | } |