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1 /*
2 * QEMU Block backends
3 *
4 * Copyright (C) 2014-2016 Red Hat, Inc.
5 *
6 * Authors:
7 * Markus Armbruster <armbru@redhat.com>,
8 *
9 * This work is licensed under the terms of the GNU LGPL, version 2.1
10 * or later. See the COPYING.LIB file in the top-level directory.
11 */
12
13 #ifndef BLOCK_BACKEND_IO_H
14 #define BLOCK_BACKEND_IO_H
15
16 #include "block-backend-common.h"
17 #include "block/accounting.h"
18
19 /*
20 * I/O API functions. These functions are thread-safe.
21 *
22 * See include/block/block-io.h for more information about
23 * the I/O API.
24 */
25
26 const char *blk_name(const BlockBackend *blk);
27
28 BlockDriverState *blk_bs(BlockBackend *blk);
29
30 void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
31 void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow);
32 void blk_set_disable_request_queuing(BlockBackend *blk, bool disable);
33 bool blk_iostatus_is_enabled(const BlockBackend *blk);
34
35 /*
36 * Return the qdev ID, or if no ID is assigned the QOM path,
37 * of the block device attached to the BlockBackend.
38 *
39 * The caller is responsible for releasing the value returned
40 * with g_free() after use.
41 */
42 char *blk_get_attached_dev_id(BlockBackend *blk);
43
44 BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
45 int64_t bytes, BdrvRequestFlags flags,
46 BlockCompletionFunc *cb, void *opaque);
47
48 BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset,
49 QEMUIOVector *qiov, BdrvRequestFlags flags,
50 BlockCompletionFunc *cb, void *opaque);
51 BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset,
52 QEMUIOVector *qiov, BdrvRequestFlags flags,
53 BlockCompletionFunc *cb, void *opaque);
54 BlockAIOCB *blk_aio_flush(BlockBackend *blk,
55 BlockCompletionFunc *cb, void *opaque);
56 BlockAIOCB *blk_aio_zone_report(BlockBackend *blk, int64_t offset,
57 unsigned int *nr_zones,
58 BlockZoneDescriptor *zones,
59 BlockCompletionFunc *cb, void *opaque);
60 BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
61 int64_t offset, int64_t len,
62 BlockCompletionFunc *cb, void *opaque);
63 BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset,
64 QEMUIOVector *qiov, BdrvRequestFlags flags,
65 BlockCompletionFunc *cb, void *opaque);
66 BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes,
67 BlockCompletionFunc *cb, void *opaque);
68 void blk_aio_cancel_async(BlockAIOCB *acb);
69 BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
70 BlockCompletionFunc *cb, void *opaque);
71
72 void blk_inc_in_flight(BlockBackend *blk);
73 void blk_dec_in_flight(BlockBackend *blk);
74 void coroutine_fn blk_co_start_request(BlockBackend *blk);
75 void blk_end_request(BlockBackend *blk);
76
77 bool coroutine_fn GRAPH_RDLOCK blk_co_is_inserted(BlockBackend *blk);
78 bool co_wrapper_mixed_bdrv_rdlock blk_is_inserted(BlockBackend *blk);
79
80 bool coroutine_fn GRAPH_RDLOCK blk_co_is_available(BlockBackend *blk);
81 bool co_wrapper_mixed_bdrv_rdlock blk_is_available(BlockBackend *blk);
82
83 void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked);
84 void co_wrapper blk_lock_medium(BlockBackend *blk, bool locked);
85
86 void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag);
87 void co_wrapper blk_eject(BlockBackend *blk, bool eject_flag);
88
89 int64_t coroutine_fn blk_co_getlength(BlockBackend *blk);
90 int64_t co_wrapper_mixed blk_getlength(BlockBackend *blk);
91
92 void coroutine_fn blk_co_get_geometry(BlockBackend *blk,
93 uint64_t *nb_sectors_ptr);
94 void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr);
95
96 int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk);
97 int64_t blk_nb_sectors(BlockBackend *blk);
98
99 void *blk_try_blockalign(BlockBackend *blk, size_t size);
100 void *blk_blockalign(BlockBackend *blk, size_t size);
101 bool blk_is_writable(BlockBackend *blk);
102 bool blk_enable_write_cache(BlockBackend *blk);
103 BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read);
104 BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
105 int error);
106 void blk_error_action(BlockBackend *blk, BlockErrorAction action,
107 bool is_read, int error);
108 void blk_iostatus_set_err(BlockBackend *blk, int error);
109 int blk_get_max_iov(BlockBackend *blk);
110 int blk_get_max_hw_iov(BlockBackend *blk);
111
112 AioContext *blk_get_aio_context(BlockBackend *blk);
113 BlockAcctStats *blk_get_stats(BlockBackend *blk);
114 void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
115 BlockCompletionFunc *cb, void *opaque);
116 BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
117 BlockCompletionFunc *cb,
118 void *opaque, int ret);
119
120 uint32_t blk_get_request_alignment(BlockBackend *blk);
121 uint32_t blk_get_pwrite_zeroes_alignment(BlockBackend *blk);
122 uint32_t blk_get_max_transfer(BlockBackend *blk);
123 uint64_t blk_get_max_hw_transfer(BlockBackend *blk);
124
125 int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
126 BlockBackend *blk_out, int64_t off_out,
127 int64_t bytes, BdrvRequestFlags read_flags,
128 BdrvRequestFlags write_flags);
129
130 int coroutine_fn blk_co_block_status_above(BlockBackend *blk,
131 BlockDriverState *base,
132 int64_t offset, int64_t bytes,
133 int64_t *pnum, int64_t *map,
134 BlockDriverState **file);
135 int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk,
136 BlockDriverState *base,
137 bool include_base, int64_t offset,
138 int64_t bytes, int64_t *pnum);
139
140 /*
141 * "I/O or GS" API functions. These functions can run without
142 * the BQL, but only in one specific iothread/main loop.
143 *
144 * See include/block/block-io.h for more information about
145 * the "I/O or GS" API.
146 */
147
148 int co_wrapper_mixed blk_pread(BlockBackend *blk, int64_t offset,
149 int64_t bytes, void *buf,
150 BdrvRequestFlags flags);
151 int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes,
152 void *buf, BdrvRequestFlags flags);
153
154 int co_wrapper_mixed blk_preadv(BlockBackend *blk, int64_t offset,
155 int64_t bytes, QEMUIOVector *qiov,
156 BdrvRequestFlags flags);
157 int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
158 int64_t bytes, QEMUIOVector *qiov,
159 BdrvRequestFlags flags);
160
161 int co_wrapper_mixed blk_preadv_part(BlockBackend *blk, int64_t offset,
162 int64_t bytes, QEMUIOVector *qiov,
163 size_t qiov_offset,
164 BdrvRequestFlags flags);
165 int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset,
166 int64_t bytes, QEMUIOVector *qiov,
167 size_t qiov_offset, BdrvRequestFlags flags);
168
169 int co_wrapper_mixed blk_pwrite(BlockBackend *blk, int64_t offset,
170 int64_t bytes, const void *buf,
171 BdrvRequestFlags flags);
172 int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes,
173 const void *buf, BdrvRequestFlags flags);
174
175 int co_wrapper_mixed blk_pwritev(BlockBackend *blk, int64_t offset,
176 int64_t bytes, QEMUIOVector *qiov,
177 BdrvRequestFlags flags);
178 int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
179 int64_t bytes, QEMUIOVector *qiov,
180 BdrvRequestFlags flags);
181
182 int co_wrapper_mixed blk_pwritev_part(BlockBackend *blk, int64_t offset,
183 int64_t bytes, QEMUIOVector *qiov,
184 size_t qiov_offset,
185 BdrvRequestFlags flags);
186 int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset,
187 int64_t bytes,
188 QEMUIOVector *qiov, size_t qiov_offset,
189 BdrvRequestFlags flags);
190
191 int co_wrapper_mixed blk_pwrite_compressed(BlockBackend *blk,
192 int64_t offset, int64_t bytes,
193 const void *buf);
194 int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset,
195 int64_t bytes, const void *buf);
196
197 int co_wrapper_mixed blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
198 int64_t bytes,
199 BdrvRequestFlags flags);
200 int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
201 int64_t bytes, BdrvRequestFlags flags);
202
203 int coroutine_fn blk_co_zone_report(BlockBackend *blk, int64_t offset,
204 unsigned int *nr_zones,
205 BlockZoneDescriptor *zones);
206 int co_wrapper_mixed blk_zone_report(BlockBackend *blk, int64_t offset,
207 unsigned int *nr_zones,
208 BlockZoneDescriptor *zones);
209 int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
210 int64_t offset, int64_t len);
211 int co_wrapper_mixed blk_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
212 int64_t offset, int64_t len);
213 int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset,
214 QEMUIOVector *qiov,
215 BdrvRequestFlags flags);
216 int co_wrapper_mixed blk_zone_append(BlockBackend *blk, int64_t *offset,
217 QEMUIOVector *qiov,
218 BdrvRequestFlags flags);
219
220 int co_wrapper_mixed blk_pdiscard(BlockBackend *blk, int64_t offset,
221 int64_t bytes, BdrvRequestFlags flags);
222 int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset,
223 int64_t bytes, BdrvRequestFlags flags);
224
225 int co_wrapper_mixed blk_flush(BlockBackend *blk);
226 int coroutine_fn blk_co_flush(BlockBackend *blk);
227
228 int co_wrapper_mixed blk_ioctl(BlockBackend *blk, unsigned long int req,
229 void *buf);
230 int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req,
231 void *buf);
232
233 int co_wrapper_mixed blk_truncate(BlockBackend *blk, int64_t offset,
234 bool exact, PreallocMode prealloc,
235 BdrvRequestFlags flags, Error **errp);
236 int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact,
237 PreallocMode prealloc, BdrvRequestFlags flags,
238 Error **errp);
239
240 #endif /* BLOCK_BACKEND_IO_H */