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1 | /* | |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
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: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
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 | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #ifndef BLOCK_INT_IO_H | |
25 | #define BLOCK_INT_IO_H | |
26 | ||
27 | #include "block/block_int-common.h" | |
28 | #include "qemu/hbitmap.h" | |
29 | #include "qemu/main-loop.h" | |
30 | ||
31 | /* | |
32 | * I/O API functions. These functions are thread-safe. | |
33 | * | |
34 | * See include/block/block-io.h for more information about | |
35 | * the I/O API. | |
36 | */ | |
37 | ||
38 | int coroutine_fn bdrv_co_preadv_snapshot(BdrvChild *child, | |
39 | int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset); | |
40 | int coroutine_fn bdrv_co_snapshot_block_status(BlockDriverState *bs, | |
41 | bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum, | |
42 | int64_t *map, BlockDriverState **file); | |
43 | int coroutine_fn bdrv_co_pdiscard_snapshot(BlockDriverState *bs, | |
44 | int64_t offset, int64_t bytes); | |
45 | ||
46 | ||
47 | int coroutine_fn bdrv_co_preadv(BdrvChild *child, | |
48 | int64_t offset, int64_t bytes, QEMUIOVector *qiov, | |
49 | BdrvRequestFlags flags); | |
50 | int coroutine_fn bdrv_co_preadv_part(BdrvChild *child, | |
51 | int64_t offset, int64_t bytes, | |
52 | QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); | |
53 | int coroutine_fn bdrv_co_pwritev(BdrvChild *child, | |
54 | int64_t offset, int64_t bytes, QEMUIOVector *qiov, | |
55 | BdrvRequestFlags flags); | |
56 | int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child, | |
57 | int64_t offset, int64_t bytes, | |
58 | QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); | |
59 | ||
60 | static inline int coroutine_fn bdrv_co_pread(BdrvChild *child, | |
61 | int64_t offset, int64_t bytes, void *buf, BdrvRequestFlags flags) | |
62 | { | |
63 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
64 | IO_CODE(); | |
65 | ||
66 | return bdrv_co_preadv(child, offset, bytes, &qiov, flags); | |
67 | } | |
68 | ||
69 | static inline int coroutine_fn bdrv_co_pwrite(BdrvChild *child, | |
70 | int64_t offset, int64_t bytes, const void *buf, BdrvRequestFlags flags) | |
71 | { | |
72 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
73 | IO_CODE(); | |
74 | ||
75 | return bdrv_co_pwritev(child, offset, bytes, &qiov, flags); | |
76 | } | |
77 | ||
78 | void coroutine_fn bdrv_make_request_serialising(BdrvTrackedRequest *req, | |
79 | uint64_t align); | |
80 | BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs); | |
81 | ||
82 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, | |
83 | const char *filename); | |
84 | ||
85 | /** | |
86 | * bdrv_wakeup: | |
87 | * @bs: The BlockDriverState for which an I/O operation has been completed. | |
88 | * | |
89 | * Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During | |
90 | * synchronous I/O on a BlockDriverState that is attached to another | |
91 | * I/O thread, the main thread lets the I/O thread's event loop run, | |
92 | * waiting for the I/O operation to complete. A bdrv_wakeup will wake | |
93 | * up the main thread if necessary. | |
94 | * | |
95 | * Manual calls to bdrv_wakeup are rarely necessary, because | |
96 | * bdrv_dec_in_flight already calls it. | |
97 | */ | |
98 | void bdrv_wakeup(BlockDriverState *bs); | |
99 | ||
100 | const char *bdrv_get_parent_name(const BlockDriverState *bs); | |
101 | bool blk_dev_has_tray(BlockBackend *blk); | |
102 | bool blk_dev_is_tray_open(BlockBackend *blk); | |
103 | ||
104 | void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes); | |
105 | ||
106 | void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); | |
107 | void bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, | |
108 | const BdrvDirtyBitmap *src, | |
109 | HBitmap **backup, bool lock); | |
110 | ||
111 | void bdrv_inc_in_flight(BlockDriverState *bs); | |
112 | void bdrv_dec_in_flight(BlockDriverState *bs); | |
113 | ||
114 | int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, int64_t src_offset, | |
115 | BdrvChild *dst, int64_t dst_offset, | |
116 | int64_t bytes, | |
117 | BdrvRequestFlags read_flags, | |
118 | BdrvRequestFlags write_flags); | |
119 | int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, int64_t src_offset, | |
120 | BdrvChild *dst, int64_t dst_offset, | |
121 | int64_t bytes, | |
122 | BdrvRequestFlags read_flags, | |
123 | BdrvRequestFlags write_flags); | |
124 | ||
125 | int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs, | |
126 | int64_t hint); | |
127 | int co_wrapper_mixed | |
128 | bdrv_refresh_total_sectors(BlockDriverState *bs, int64_t hint); | |
129 | ||
130 | BdrvChild *bdrv_cow_child(BlockDriverState *bs); | |
131 | BdrvChild *bdrv_filter_child(BlockDriverState *bs); | |
132 | BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs); | |
133 | BdrvChild *bdrv_primary_child(BlockDriverState *bs); | |
134 | BlockDriverState *bdrv_skip_filters(BlockDriverState *bs); | |
135 | BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs); | |
136 | ||
137 | static inline BlockDriverState *bdrv_cow_bs(BlockDriverState *bs) | |
138 | { | |
139 | IO_CODE(); | |
140 | return child_bs(bdrv_cow_child(bs)); | |
141 | } | |
142 | ||
143 | static inline BlockDriverState *bdrv_filter_bs(BlockDriverState *bs) | |
144 | { | |
145 | IO_CODE(); | |
146 | return child_bs(bdrv_filter_child(bs)); | |
147 | } | |
148 | ||
149 | static inline BlockDriverState *bdrv_filter_or_cow_bs(BlockDriverState *bs) | |
150 | { | |
151 | IO_CODE(); | |
152 | return child_bs(bdrv_filter_or_cow_child(bs)); | |
153 | } | |
154 | ||
155 | static inline BlockDriverState *bdrv_primary_bs(BlockDriverState *bs) | |
156 | { | |
157 | IO_CODE(); | |
158 | return child_bs(bdrv_primary_child(bs)); | |
159 | } | |
160 | ||
161 | /** | |
162 | * Check whether the given offset is in the cached block-status data | |
163 | * region. | |
164 | * | |
165 | * If it is, and @pnum is not NULL, *pnum is set to | |
166 | * `bsc.data_end - offset`, i.e. how many bytes, starting from | |
167 | * @offset, are data (according to the cache). | |
168 | * Otherwise, *pnum is not touched. | |
169 | */ | |
170 | bool bdrv_bsc_is_data(BlockDriverState *bs, int64_t offset, int64_t *pnum); | |
171 | ||
172 | /** | |
173 | * If [offset, offset + bytes) overlaps with the currently cached | |
174 | * block-status region, invalidate the cache. | |
175 | * | |
176 | * (To be used by I/O paths that cause data regions to be zero or | |
177 | * holes.) | |
178 | */ | |
179 | void bdrv_bsc_invalidate_range(BlockDriverState *bs, | |
180 | int64_t offset, int64_t bytes); | |
181 | ||
182 | /** | |
183 | * Mark the range [offset, offset + bytes) as a data region. | |
184 | */ | |
185 | void bdrv_bsc_fill(BlockDriverState *bs, int64_t offset, int64_t bytes); | |
186 | ||
187 | #endif /* BLOCK_INT_IO_H */ |