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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_H | |
25 | #define BLOCK_INT_H | |
26 | ||
27 | #include "block.h" | |
28 | #include "qemu-option.h" | |
29 | #include "qemu-queue.h" | |
30 | ||
31 | #define BLOCK_FLAG_ENCRYPT 1 | |
32 | #define BLOCK_FLAG_COMPAT6 4 | |
33 | ||
34 | #define BLOCK_OPT_SIZE "size" | |
35 | #define BLOCK_OPT_ENCRYPT "encryption" | |
36 | #define BLOCK_OPT_COMPAT6 "compat6" | |
37 | #define BLOCK_OPT_BACKING_FILE "backing_file" | |
38 | #define BLOCK_OPT_BACKING_FMT "backing_fmt" | |
39 | #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" | |
40 | #define BLOCK_OPT_TABLE_SIZE "table_size" | |
41 | #define BLOCK_OPT_PREALLOC "preallocation" | |
42 | #define BLOCK_OPT_SUBFMT "subformat" | |
43 | ||
44 | typedef struct AIOPool { | |
45 | void (*cancel)(BlockDriverAIOCB *acb); | |
46 | int aiocb_size; | |
47 | BlockDriverAIOCB *free_aiocb; | |
48 | } AIOPool; | |
49 | ||
50 | struct BlockDriver { | |
51 | const char *format_name; | |
52 | int instance_size; | |
53 | int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); | |
54 | int (*bdrv_probe_device)(const char *filename); | |
55 | int (*bdrv_open)(BlockDriverState *bs, int flags); | |
56 | int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags); | |
57 | int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, | |
58 | uint8_t *buf, int nb_sectors); | |
59 | int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, | |
60 | const uint8_t *buf, int nb_sectors); | |
61 | void (*bdrv_close)(BlockDriverState *bs); | |
62 | int (*bdrv_create)(const char *filename, QEMUOptionParameter *options); | |
63 | int (*bdrv_flush)(BlockDriverState *bs); | |
64 | int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num, | |
65 | int nb_sectors, int *pnum); | |
66 | int (*bdrv_set_key)(BlockDriverState *bs, const char *key); | |
67 | int (*bdrv_make_empty)(BlockDriverState *bs); | |
68 | /* aio */ | |
69 | BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, | |
70 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
71 | BlockDriverCompletionFunc *cb, void *opaque); | |
72 | BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, | |
73 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
74 | BlockDriverCompletionFunc *cb, void *opaque); | |
75 | BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, | |
76 | BlockDriverCompletionFunc *cb, void *opaque); | |
77 | int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num, | |
78 | int nb_sectors); | |
79 | ||
80 | int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs, | |
81 | int num_reqs); | |
82 | int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a, | |
83 | BlockRequest *b); | |
84 | ||
85 | ||
86 | const char *protocol_name; | |
87 | int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); | |
88 | int64_t (*bdrv_getlength)(BlockDriverState *bs); | |
89 | int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); | |
90 | int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, | |
91 | const uint8_t *buf, int nb_sectors); | |
92 | ||
93 | int (*bdrv_snapshot_create)(BlockDriverState *bs, | |
94 | QEMUSnapshotInfo *sn_info); | |
95 | int (*bdrv_snapshot_goto)(BlockDriverState *bs, | |
96 | const char *snapshot_id); | |
97 | int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id); | |
98 | int (*bdrv_snapshot_list)(BlockDriverState *bs, | |
99 | QEMUSnapshotInfo **psn_info); | |
100 | int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, | |
101 | const char *snapshot_name); | |
102 | int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); | |
103 | ||
104 | int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf, | |
105 | int64_t pos, int size); | |
106 | int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf, | |
107 | int64_t pos, int size); | |
108 | ||
109 | int (*bdrv_change_backing_file)(BlockDriverState *bs, | |
110 | const char *backing_file, const char *backing_fmt); | |
111 | ||
112 | /* removable device specific */ | |
113 | int (*bdrv_is_inserted)(BlockDriverState *bs); | |
114 | int (*bdrv_media_changed)(BlockDriverState *bs); | |
115 | int (*bdrv_eject)(BlockDriverState *bs, int eject_flag); | |
116 | int (*bdrv_set_locked)(BlockDriverState *bs, int locked); | |
117 | ||
118 | /* to control generic scsi devices */ | |
119 | int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); | |
120 | BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, | |
121 | unsigned long int req, void *buf, | |
122 | BlockDriverCompletionFunc *cb, void *opaque); | |
123 | ||
124 | /* List of options for creating images, terminated by name == NULL */ | |
125 | QEMUOptionParameter *create_options; | |
126 | ||
127 | ||
128 | /* | |
129 | * Returns 0 for completed check, -errno for internal errors. | |
130 | * The check results are stored in result. | |
131 | */ | |
132 | int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result); | |
133 | ||
134 | void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); | |
135 | ||
136 | /* | |
137 | * Returns 1 if newly created images are guaranteed to contain only | |
138 | * zeros, 0 otherwise. | |
139 | */ | |
140 | int (*bdrv_has_zero_init)(BlockDriverState *bs); | |
141 | ||
142 | QLIST_ENTRY(BlockDriver) list; | |
143 | }; | |
144 | ||
145 | struct BlockDriverState { | |
146 | int64_t total_sectors; /* if we are reading a disk image, give its | |
147 | size in sectors */ | |
148 | int read_only; /* if true, the media is read only */ | |
149 | int keep_read_only; /* if true, the media was requested to stay read only */ | |
150 | int open_flags; /* flags used to open the file, re-used for re-open */ | |
151 | int removable; /* if true, the media can be removed */ | |
152 | int locked; /* if true, the media cannot temporarily be ejected */ | |
153 | int tray_open; /* if true, the virtual tray is open */ | |
154 | int encrypted; /* if true, the media is encrypted */ | |
155 | int valid_key; /* if true, a valid encryption key has been set */ | |
156 | int sg; /* if true, the device is a /dev/sg* */ | |
157 | /* event callback when inserting/removing */ | |
158 | void (*change_cb)(void *opaque, int reason); | |
159 | void *change_opaque; | |
160 | ||
161 | BlockDriver *drv; /* NULL means no media */ | |
162 | void *opaque; | |
163 | ||
164 | DeviceState *peer; | |
165 | ||
166 | char filename[1024]; | |
167 | char backing_file[1024]; /* if non zero, the image is a diff of | |
168 | this file image */ | |
169 | char backing_format[16]; /* if non-zero and backing_file exists */ | |
170 | int is_temporary; | |
171 | int media_changed; | |
172 | ||
173 | BlockDriverState *backing_hd; | |
174 | BlockDriverState *file; | |
175 | ||
176 | /* async read/write emulation */ | |
177 | ||
178 | void *sync_aiocb; | |
179 | ||
180 | /* I/O stats (display with "info blockstats"). */ | |
181 | uint64_t rd_bytes; | |
182 | uint64_t wr_bytes; | |
183 | uint64_t rd_ops; | |
184 | uint64_t wr_ops; | |
185 | uint64_t wr_highest_sector; | |
186 | ||
187 | /* Whether the disk can expand beyond total_sectors */ | |
188 | int growable; | |
189 | ||
190 | /* the memory alignment required for the buffers handled by this driver */ | |
191 | int buffer_alignment; | |
192 | ||
193 | /* do we need to tell the quest if we have a volatile write cache? */ | |
194 | int enable_write_cache; | |
195 | ||
196 | /* NOTE: the following infos are only hints for real hardware | |
197 | drivers. They are not used by the block driver */ | |
198 | int cyls, heads, secs, translation; | |
199 | BlockErrorAction on_read_error, on_write_error; | |
200 | char device_name[32]; | |
201 | unsigned long *dirty_bitmap; | |
202 | int64_t dirty_count; | |
203 | int in_use; /* users other than guest access, eg. block migration */ | |
204 | QTAILQ_ENTRY(BlockDriverState) list; | |
205 | void *private; | |
206 | }; | |
207 | ||
208 | #define CHANGE_MEDIA 0x01 | |
209 | #define CHANGE_SIZE 0x02 | |
210 | ||
211 | struct BlockDriverAIOCB { | |
212 | AIOPool *pool; | |
213 | BlockDriverState *bs; | |
214 | BlockDriverCompletionFunc *cb; | |
215 | void *opaque; | |
216 | BlockDriverAIOCB *next; | |
217 | }; | |
218 | ||
219 | void get_tmp_filename(char *filename, int size); | |
220 | ||
221 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, | |
222 | BlockDriverCompletionFunc *cb, void *opaque); | |
223 | void qemu_aio_release(void *p); | |
224 | ||
225 | void *qemu_blockalign(BlockDriverState *bs, size_t size); | |
226 | ||
227 | #ifdef _WIN32 | |
228 | int is_windows_drive(const char *filename); | |
229 | #endif | |
230 | ||
231 | typedef struct BlockConf { | |
232 | BlockDriverState *bs; | |
233 | uint16_t physical_block_size; | |
234 | uint16_t logical_block_size; | |
235 | uint16_t min_io_size; | |
236 | uint32_t opt_io_size; | |
237 | int32_t bootindex; | |
238 | uint32_t discard_granularity; | |
239 | } BlockConf; | |
240 | ||
241 | static inline unsigned int get_physical_block_exp(BlockConf *conf) | |
242 | { | |
243 | unsigned int exp = 0, size; | |
244 | ||
245 | for (size = conf->physical_block_size; | |
246 | size > conf->logical_block_size; | |
247 | size >>= 1) { | |
248 | exp++; | |
249 | } | |
250 | ||
251 | return exp; | |
252 | } | |
253 | ||
254 | #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \ | |
255 | DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \ | |
256 | DEFINE_PROP_UINT16("logical_block_size", _state, \ | |
257 | _conf.logical_block_size, 512), \ | |
258 | DEFINE_PROP_UINT16("physical_block_size", _state, \ | |
259 | _conf.physical_block_size, 512), \ | |
260 | DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \ | |
261 | DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \ | |
262 | DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \ | |
263 | DEFINE_PROP_UINT32("discard_granularity", _state, \ | |
264 | _conf.discard_granularity, 0) | |
265 | ||
266 | #endif /* BLOCK_INT_H */ |