json-lexer: Handle missing escapes
[qemu.git] / block_int.h
blob1a7240c582ed335365c028119a4ac26ca2290b0b
1 /*
2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 #ifndef BLOCK_INT_H
25 #define BLOCK_INT_H
27 #include "block.h"
28 #include "qemu-option.h"
29 #include "qemu-queue.h"
31 #define BLOCK_FLAG_ENCRYPT 1
32 #define BLOCK_FLAG_COMPRESS 2
33 #define BLOCK_FLAG_COMPAT6 4
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"
43 typedef struct AIOPool {
44 void (*cancel)(BlockDriverAIOCB *acb);
45 int aiocb_size;
46 BlockDriverAIOCB *free_aiocb;
47 } AIOPool;
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);
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);
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);
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);
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);
103 int (*bdrv_change_backing_file)(BlockDriverState *bs,
104 const char *backing_file, const char *backing_fmt);
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);
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);
118 /* List of options for creating images, terminated by name == NULL */
119 QEMUOptionParameter *create_options;
122 /* Returns number of errors in image, -errno for internal errors */
123 int (*bdrv_check)(BlockDriverState* bs);
125 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
127 /* Set if newly created images are not guaranteed to contain only zeros */
128 int no_zero_init;
130 QLIST_ENTRY(BlockDriver) list;
133 struct BlockDriverState {
134 int64_t total_sectors; /* if we are reading a disk image, give its
135 size in sectors */
136 int read_only; /* if true, the media is read only */
137 int keep_read_only; /* if true, the media was requested to stay read only */
138 int open_flags; /* flags used to open the file, re-used for re-open */
139 int removable; /* if true, the media can be removed */
140 int locked; /* if true, the media cannot temporarily be ejected */
141 int encrypted; /* if true, the media is encrypted */
142 int valid_key; /* if true, a valid encryption key has been set */
143 int sg; /* if true, the device is a /dev/sg* */
144 /* event callback when inserting/removing */
145 void (*change_cb)(void *opaque);
146 void *change_opaque;
148 BlockDriver *drv; /* NULL means no media */
149 void *opaque;
151 char filename[1024];
152 char backing_file[1024]; /* if non zero, the image is a diff of
153 this file image */
154 char backing_format[16]; /* if non-zero and backing_file exists */
155 int is_temporary;
156 int media_changed;
158 BlockDriverState *backing_hd;
159 BlockDriverState *file;
161 /* async read/write emulation */
163 void *sync_aiocb;
165 /* I/O stats (display with "info blockstats"). */
166 uint64_t rd_bytes;
167 uint64_t wr_bytes;
168 uint64_t rd_ops;
169 uint64_t wr_ops;
170 uint64_t wr_highest_sector;
172 /* Whether the disk can expand beyond total_sectors */
173 int growable;
175 /* the memory alignment required for the buffers handled by this driver */
176 int buffer_alignment;
178 /* do we need to tell the quest if we have a volatile write cache? */
179 int enable_write_cache;
181 /* NOTE: the following infos are only hints for real hardware
182 drivers. They are not used by the block driver */
183 int cyls, heads, secs, translation;
184 int type;
185 char device_name[32];
186 unsigned long *dirty_bitmap;
187 int64_t dirty_count;
188 QTAILQ_ENTRY(BlockDriverState) list;
189 void *private;
192 struct BlockDriverAIOCB {
193 AIOPool *pool;
194 BlockDriverState *bs;
195 BlockDriverCompletionFunc *cb;
196 void *opaque;
197 BlockDriverAIOCB *next;
200 void get_tmp_filename(char *filename, int size);
202 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
203 BlockDriverCompletionFunc *cb, void *opaque);
204 void qemu_aio_release(void *p);
206 void *qemu_blockalign(BlockDriverState *bs, size_t size);
208 #ifdef _WIN32
209 int is_windows_drive(const char *filename);
210 #endif
212 struct DriveInfo;
214 typedef struct BlockConf {
215 struct DriveInfo *dinfo;
216 uint16_t physical_block_size;
217 uint16_t logical_block_size;
218 uint16_t min_io_size;
219 uint32_t opt_io_size;
220 } BlockConf;
222 static inline unsigned int get_physical_block_exp(BlockConf *conf)
224 unsigned int exp = 0, size;
226 for (size = conf->physical_block_size; size > 512; size >>= 1) {
227 exp++;
230 return exp;
233 #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
234 DEFINE_PROP_DRIVE("drive", _state, _conf.dinfo), \
235 DEFINE_PROP_UINT16("logical_block_size", _state, \
236 _conf.logical_block_size, 512), \
237 DEFINE_PROP_UINT16("physical_block_size", _state, \
238 _conf.physical_block_size, 512), \
239 DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 512), \
240 DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 512)
242 #endif /* BLOCK_INT_H */