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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_COMPRESS	2
33 #define BLOCK_FLAG_COMPAT6	4
34 
35 #define BLOCK_OPT_SIZE          "size"
36 #define BLOCK_OPT_ENCRYPT       "encryption"
37 #define BLOCK_OPT_COMPAT6       "compat6"
38 #define BLOCK_OPT_BACKING_FILE  "backing_file"
39 #define BLOCK_OPT_BACKING_FMT   "backing_fmt"
40 #define BLOCK_OPT_CLUSTER_SIZE  "cluster_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     void (*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 
77     int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
78         int num_reqs);
79     int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
80         BlockRequest *b);
81 
82 
83     const char *protocol_name;
84     int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
85     int64_t (*bdrv_getlength)(BlockDriverState *bs);
86     int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
87                                  const uint8_t *buf, int nb_sectors);
88 
89     int (*bdrv_snapshot_create)(BlockDriverState *bs,
90                                 QEMUSnapshotInfo *sn_info);
91     int (*bdrv_snapshot_goto)(BlockDriverState *bs,
92                               const char *snapshot_id);
93     int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
94     int (*bdrv_snapshot_list)(BlockDriverState *bs,
95                               QEMUSnapshotInfo **psn_info);
96     int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
97 
98     int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
99                              int64_t pos, int size);
100     int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
101                              int64_t pos, int size);
102 
103     int (*bdrv_change_backing_file)(BlockDriverState *bs,
104         const char *backing_file, const char *backing_fmt);
105 
106     /* removable device specific */
107     int (*bdrv_is_inserted)(BlockDriverState *bs);
108     int (*bdrv_media_changed)(BlockDriverState *bs);
109     int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
110     int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
111 
112     /* to control generic scsi devices */
113     int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
114     BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
115         unsigned long int req, void *buf,
116         BlockDriverCompletionFunc *cb, void *opaque);
117 
118     /* List of options for creating images, terminated by name == NULL */
119     QEMUOptionParameter *create_options;
120 
121 
122     /*
123      * Returns 0 for completed check, -errno for internal errors.
124      * The check results are stored in result.
125      */
126     int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);
127 
128     void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
129 
130     /*
131      * Returns 1 if newly created images are guaranteed to contain only
132      * zeros, 0 otherwise.
133      */
134     int (*bdrv_has_zero_init)(BlockDriverState *bs);
135 
136     QLIST_ENTRY(BlockDriver) list;
137 };
138 
139 struct BlockDriverState {
140     int64_t total_sectors; /* if we are reading a disk image, give its
141                               size in sectors */
142     int read_only; /* if true, the media is read only */
143     int keep_read_only; /* if true, the media was requested to stay read only */
144     int open_flags; /* flags used to open the file, re-used for re-open */
145     int removable; /* if true, the media can be removed */
146     int locked;    /* if true, the media cannot temporarily be ejected */
147     int tray_open; /* if true, the virtual tray is open */
148     int encrypted; /* if true, the media is encrypted */
149     int valid_key; /* if true, a valid encryption key has been set */
150     int sg;        /* if true, the device is a /dev/sg* */
151     int probed;    /* if true, format was probed automatically */
152     /* event callback when inserting/removing */
153     void (*change_cb)(void *opaque);
154     void *change_opaque;
155 
156     BlockDriver *drv; /* NULL means no media */
157     void *opaque;
158 
159     DeviceState *peer;
160 
161     char filename[1024];
162     char backing_file[1024]; /* if non zero, the image is a diff of
163                                 this file image */
164     char backing_format[16]; /* if non-zero and backing_file exists */
165     int is_temporary;
166     int media_changed;
167 
168     BlockDriverState *backing_hd;
169     BlockDriverState *file;
170 
171     /* async read/write emulation */
172 
173     void *sync_aiocb;
174 
175     /* I/O stats (display with "info blockstats"). */
176     uint64_t rd_bytes;
177     uint64_t wr_bytes;
178     uint64_t rd_ops;
179     uint64_t wr_ops;
180     uint64_t wr_highest_sector;
181 
182     /* Whether the disk can expand beyond total_sectors */
183     int growable;
184 
185     /* the memory alignment required for the buffers handled by this driver */
186     int buffer_alignment;
187 
188     /* do we need to tell the quest if we have a volatile write cache? */
189     int enable_write_cache;
190 
191     /* NOTE: the following infos are only hints for real hardware
192        drivers. They are not used by the block driver */
193     int cyls, heads, secs, translation;
194     int type;
195     BlockErrorAction on_read_error, on_write_error;
196     char device_name[32];
197     unsigned long *dirty_bitmap;
198     int64_t dirty_count;
199     QTAILQ_ENTRY(BlockDriverState) list;
200     void *private;
201 };
202 
203 struct BlockDriverAIOCB {
204     AIOPool *pool;
205     BlockDriverState *bs;
206     BlockDriverCompletionFunc *cb;
207     void *opaque;
208     BlockDriverAIOCB *next;
209 };
210 
211 void get_tmp_filename(char *filename, int size);
212 
213 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
214                    BlockDriverCompletionFunc *cb, void *opaque);
215 void qemu_aio_release(void *p);
216 
217 void *qemu_blockalign(BlockDriverState *bs, size_t size);
218 
219 #ifdef _WIN32
220 int is_windows_drive(const char *filename);
221 #endif
222 
223 typedef struct BlockConf {
224     BlockDriverState *bs;
225     uint16_t physical_block_size;
226     uint16_t logical_block_size;
227     uint16_t min_io_size;
228     uint32_t opt_io_size;
229 } BlockConf;
230 
get_physical_block_exp(BlockConf * conf)231 static inline unsigned int get_physical_block_exp(BlockConf *conf)
232 {
233     unsigned int exp = 0, size;
234 
235     for (size = conf->physical_block_size;
236         size > conf->logical_block_size;
237         size >>= 1) {
238         exp++;
239     }
240 
241     return exp;
242 }
243 
244 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
245     DEFINE_PROP_DRIVE("drive", _state, _conf.bs),                       \
246     DEFINE_PROP_UINT16("logical_block_size", _state,                    \
247                        _conf.logical_block_size, 512),                  \
248     DEFINE_PROP_UINT16("physical_block_size", _state,                   \
249                        _conf.physical_block_size, 512),                 \
250     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
251     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0)
252 
253 #endif /* BLOCK_INT_H */
254