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68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
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
43 typedef struct AIOPool {
44 void (*cancel)(BlockDriverAIOCB *acb);
45 int aiocb_size;
46 BlockDriverAIOCB *free_aiocb;
47 } AIOPool;
48
49 struct BlockDriver {
50 const char *format_name;
51 int instance_size;
52 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
53 int (*bdrv_probe_device)(const char *filename);
54 int (*bdrv_open)(BlockDriverState *bs, int flags);
55 int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
56 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
57 uint8_t *buf, int nb_sectors);
58 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
59 const uint8_t *buf, int nb_sectors);
60 void (*bdrv_close)(BlockDriverState *bs);
61 int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
62 int (*bdrv_flush)(BlockDriverState *bs);
63 int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
64 int nb_sectors, int *pnum);
65 int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
66 int (*bdrv_make_empty)(BlockDriverState *bs);
67 /* aio */
68 BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
69 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
70 BlockDriverCompletionFunc *cb, void *opaque);
71 BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
72 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
73 BlockDriverCompletionFunc *cb, void *opaque);
74 BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
75 BlockDriverCompletionFunc *cb, void *opaque);
76 int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
77 int nb_sectors);
78
79 int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
80 int num_reqs);
81 int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
82 BlockRequest *b);
83
84
85 const char *protocol_name;
86 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
87 int64_t (*bdrv_getlength)(BlockDriverState *bs);
88 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
89 const uint8_t *buf, int nb_sectors);
90
91 int (*bdrv_snapshot_create)(BlockDriverState *bs,
92 QEMUSnapshotInfo *sn_info);
93 int (*bdrv_snapshot_goto)(BlockDriverState *bs,
94 const char *snapshot_id);
95 int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
96 int (*bdrv_snapshot_list)(BlockDriverState *bs,
97 QEMUSnapshotInfo **psn_info);
98 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
99 const char *snapshot_name);
100 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
101
102 int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
103 int64_t pos, int size);
104 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
105 int64_t pos, int size);
106
107 int (*bdrv_change_backing_file)(BlockDriverState *bs,
108 const char *backing_file, const char *backing_fmt);
109
110 /* removable device specific */
111 int (*bdrv_is_inserted)(BlockDriverState *bs);
112 int (*bdrv_media_changed)(BlockDriverState *bs);
113 int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
114 int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
115
116 /* to control generic scsi devices */
117 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
118 BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
119 unsigned long int req, void *buf,
120 BlockDriverCompletionFunc *cb, void *opaque);
121
122 /* List of options for creating images, terminated by name == NULL */
123 QEMUOptionParameter *create_options;
124
125
126 /*
127 * Returns 0 for completed check, -errno for internal errors.
128 * The check results are stored in result.
129 */
130 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);
131
132 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
133
134 /*
135 * Returns 1 if newly created images are guaranteed to contain only
136 * zeros, 0 otherwise.
137 */
138 int (*bdrv_has_zero_init)(BlockDriverState *bs);
139
140 QLIST_ENTRY(BlockDriver) list;
141 };
142
143 struct BlockDriverState {
144 int64_t total_sectors; /* if we are reading a disk image, give its
145 size in sectors */
146 int read_only; /* if true, the media is read only */
147 int keep_read_only; /* if true, the media was requested to stay read only */
148 int open_flags; /* flags used to open the file, re-used for re-open */
149 int removable; /* if true, the media can be removed */
150 int locked; /* if true, the media cannot temporarily be ejected */
151 int tray_open; /* if true, the virtual tray is open */
152 int encrypted; /* if true, the media is encrypted */
153 int valid_key; /* if true, a valid encryption key has been set */
154 int sg; /* if true, the device is a /dev/sg* */
155 /* event callback when inserting/removing */
156 void (*change_cb)(void *opaque, int reason);
157 void *change_opaque;
158
159 BlockDriver *drv; /* NULL means no media */
160 void *opaque;
161
162 DeviceState *peer;
163
164 char filename[1024];
165 char backing_file[1024]; /* if non zero, the image is a diff of
166 this file image */
167 char backing_format[16]; /* if non-zero and backing_file exists */
168 int is_temporary;
169 int media_changed;
170
171 BlockDriverState *backing_hd;
172 BlockDriverState *file;
173
174 /* async read/write emulation */
175
176 void *sync_aiocb;
177
178 /* I/O stats (display with "info blockstats"). */
179 uint64_t rd_bytes;
180 uint64_t wr_bytes;
181 uint64_t rd_ops;
182 uint64_t wr_ops;
183 uint64_t wr_highest_sector;
184
185 /* Whether the disk can expand beyond total_sectors */
186 int growable;
187
188 /* the memory alignment required for the buffers handled by this driver */
189 int buffer_alignment;
190
191 /* do we need to tell the quest if we have a volatile write cache? */
192 int enable_write_cache;
193
194 /* NOTE: the following infos are only hints for real hardware
195 drivers. They are not used by the block driver */
196 int cyls, heads, secs, translation;
197 int type;
198 BlockErrorAction on_read_error, on_write_error;
199 char device_name[32];
200 unsigned long *dirty_bitmap;
201 int64_t dirty_count;
202 int in_use; /* users other than guest access, eg. block migration */
203 QTAILQ_ENTRY(BlockDriverState) list;
204 void *private;
205 };
206
207 #define CHANGE_MEDIA 0x01
208 #define CHANGE_SIZE 0x02
209
210 struct BlockDriverAIOCB {
211 AIOPool *pool;
212 BlockDriverState *bs;
213 BlockDriverCompletionFunc *cb;
214 void *opaque;
215 BlockDriverAIOCB *next;
216 };
217
218 void get_tmp_filename(char *filename, int size);
219
220 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
221 BlockDriverCompletionFunc *cb, void *opaque);
222 void qemu_aio_release(void *p);
223
224 void *qemu_blockalign(BlockDriverState *bs, size_t size);
225
226 #ifdef _WIN32
227 int is_windows_drive(const char *filename);
228 #endif
229
230 typedef struct BlockConf {
231 BlockDriverState *bs;
232 uint16_t physical_block_size;
233 uint16_t logical_block_size;
234 uint16_t min_io_size;
235 uint32_t opt_io_size;
236 int32_t bootindex;
237 uint32_t discard_granularity;
238 } BlockConf;
239
240 static inline unsigned int get_physical_block_exp(BlockConf *conf)
241 {
242 unsigned int exp = 0, size;
243
244 for (size = conf->physical_block_size;
245 size > conf->logical_block_size;
246 size >>= 1) {
247 exp++;
248 }
249
250 return exp;
251 }
252
253 #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
254 DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
255 DEFINE_PROP_UINT16("logical_block_size", _state, \
256 _conf.logical_block_size, 512), \
257 DEFINE_PROP_UINT16("physical_block_size", _state, \
258 _conf.physical_block_size, 512), \
259 DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
260 DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
261 DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \
262 DEFINE_PROP_UINT32("discard_granularity", _state, \
263 _conf.discard_granularity, 0)
264
265 #endif /* BLOCK_INT_H */
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