aboutsummaryrefslogtreecommitdiff
path: root/block_int.h
blob: 311bd2a6fabe7af4be6451a2678bd66af654cdc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/*
 * QEMU System Emulator block driver
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef BLOCK_INT_H
#define BLOCK_INT_H

#include "block.h"
#include "qemu-option.h"
#include "qemu-queue.h"
#include "qemu-coroutine.h"
#include "qemu-timer.h"
#include "qapi-types.h"

#define BLOCK_FLAG_ENCRYPT	1
#define BLOCK_FLAG_COMPAT6	4

#define BLOCK_IO_LIMIT_READ     0
#define BLOCK_IO_LIMIT_WRITE    1
#define BLOCK_IO_LIMIT_TOTAL    2

#define BLOCK_IO_SLICE_TIME     100000000
#define NANOSECONDS_PER_SECOND  1000000000.0

#define BLOCK_OPT_SIZE          "size"
#define BLOCK_OPT_ENCRYPT       "encryption"
#define BLOCK_OPT_COMPAT6       "compat6"
#define BLOCK_OPT_BACKING_FILE  "backing_file"
#define BLOCK_OPT_BACKING_FMT   "backing_fmt"
#define BLOCK_OPT_CLUSTER_SIZE  "cluster_size"
#define BLOCK_OPT_TABLE_SIZE    "table_size"
#define BLOCK_OPT_PREALLOC      "preallocation"
#define BLOCK_OPT_SUBFMT        "subformat"

typedef struct BdrvTrackedRequest BdrvTrackedRequest;

typedef struct AIOPool {
    void (*cancel)(BlockDriverAIOCB *acb);
    int aiocb_size;
    BlockDriverAIOCB *free_aiocb;
} AIOPool;

typedef struct BlockIOLimit {
    int64_t bps[3];
    int64_t iops[3];
} BlockIOLimit;

typedef struct BlockIOBaseValue {
    uint64_t bytes[2];
    uint64_t ios[2];
} BlockIOBaseValue;

struct BlockDriver {
    const char *format_name;
    int instance_size;
    int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
    int (*bdrv_probe_device)(const char *filename);
    int (*bdrv_open)(BlockDriverState *bs, int flags);
    int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
    int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors);
    int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
                      const uint8_t *buf, int nb_sectors);
    void (*bdrv_close)(BlockDriverState *bs);
    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
    int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
    int (*bdrv_make_empty)(BlockDriverState *bs);
    /* aio */
    BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);

    int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
    int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
    int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors);
    int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, int *pnum);

    /*
     * Invalidate any cached meta-data.
     */
    void (*bdrv_invalidate_cache)(BlockDriverState *bs);

    /*
     * Flushes all data that was already written to the OS all the way down to
     * the disk (for example raw-posix calls fsync()).
     */
    int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);

    /*
     * Flushes all internal caches to the OS. The data may still sit in a
     * writeback cache of the host OS, but it will survive a crash of the qemu
     * process.
     */
    int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);

    int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
        int num_reqs);
    int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
        BlockRequest *b);


    const char *protocol_name;
    int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
    int64_t (*bdrv_getlength)(BlockDriverState *bs);
    int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors);

    int (*bdrv_snapshot_create)(BlockDriverState *bs,
                                QEMUSnapshotInfo *sn_info);
    int (*bdrv_snapshot_goto)(BlockDriverState *bs,
                              const char *snapshot_id);
    int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
    int (*bdrv_snapshot_list)(BlockDriverState *bs,
                              QEMUSnapshotInfo **psn_info);
    int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
                                  const char *snapshot_name);
    int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);

    int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
                             int64_t pos, int size);
    int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
                             int64_t pos, int size);

    int (*bdrv_change_backing_file)(BlockDriverState *bs,
        const char *backing_file, const char *backing_fmt);

    /* removable device specific */
    int (*bdrv_is_inserted)(BlockDriverState *bs);
    int (*bdrv_media_changed)(BlockDriverState *bs);
    void (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
    void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);

    /* to control generic scsi devices */
    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
    BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque);

    /* List of options for creating images, terminated by name == NULL */
    QEMUOptionParameter *create_options;


    /*
     * Returns 0 for completed check, -errno for internal errors.
     * The check results are stored in result.
     */
    int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);

    void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);

    /*
     * Returns 1 if newly created images are guaranteed to contain only
     * zeros, 0 otherwise.
     */
    int (*bdrv_has_zero_init)(BlockDriverState *bs);

    QLIST_ENTRY(BlockDriver) list;
};

struct BlockDriverState {
    int64_t total_sectors; /* if we are reading a disk image, give its
                              size in sectors */
    int read_only; /* if true, the media is read only */
    int keep_read_only; /* if true, the media was requested to stay read only */
    int open_flags; /* flags used to open the file, re-used for re-open */
    int encrypted; /* if true, the media is encrypted */
    int valid_key; /* if true, a valid encryption key has been set */
    int sg;        /* if true, the device is a /dev/sg* */
    int copy_on_read; /* if true, copy read backing sectors into image
                         note this is a reference count */

    BlockDriver *drv; /* NULL means no media */
    void *opaque;

    void *dev;                  /* attached device model, if any */
    /* TODO change to DeviceState when all users are qdevified */
    const BlockDevOps *dev_ops;
    void *dev_opaque;

    char filename[1024];
    char backing_file[1024]; /* if non zero, the image is a diff of
                                this file image */
    char backing_format[16]; /* if non-zero and backing_file exists */
    int is_temporary;

    BlockDriverState *backing_hd;
    BlockDriverState *file;

    /* async read/write emulation */

    void *sync_aiocb;

    /* the time for latest disk I/O */
    int64_t slice_time;
    int64_t slice_start;
    int64_t slice_end;
    BlockIOLimit io_limits;
    BlockIOBaseValue  io_base;
    CoQueue      throttled_reqs;
    QEMUTimer    *block_timer;
    bool         io_limits_enabled;

    /* I/O stats (display with "info blockstats"). */
    uint64_t nr_bytes[BDRV_MAX_IOTYPE];
    uint64_t nr_ops[BDRV_MAX_IOTYPE];
    uint64_t total_time_ns[BDRV_MAX_IOTYPE];
    uint64_t wr_highest_sector;

    /* Whether the disk can expand beyond total_sectors */
    int growable;

    /* the memory alignment required for the buffers handled by this driver */
    int buffer_alignment;

    /* do we need to tell the quest if we have a volatile write cache? */
    int enable_write_cache;

    /* NOTE: the following infos are only hints for real hardware
       drivers. They are not used by the block driver */
    int cyls, heads, secs, translation;
    BlockErrorAction on_read_error, on_write_error;
    bool iostatus_enabled;
    BlockDeviceIoStatus iostatus;
    char device_name[32];
    unsigned long *dirty_bitmap;
    int64_t dirty_count;
    int in_use; /* users other than guest access, eg. block migration */
    QTAILQ_ENTRY(BlockDriverState) list;
    void *private;

    QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
};

struct BlockDriverAIOCB {
    AIOPool *pool;
    BlockDriverState *bs;
    BlockDriverCompletionFunc *cb;
    void *opaque;
    BlockDriverAIOCB *next;
};

void get_tmp_filename(char *filename, int size);

void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);

void bdrv_set_io_limits(BlockDriverState *bs,
                        BlockIOLimit *io_limits);

#ifdef _WIN32
int is_windows_drive(const char *filename);
#endif

#endif /* BLOCK_INT_H */