virtio-console: Keep chardev open for other users after hot-unplug
[qemu.git] / block.h
blob5d78fc0ed7076f52e7d872f79aa012a8620d796a
1 #ifndef BLOCK_H
2 #define BLOCK_H
4 #include "qemu-aio.h"
5 #include "qemu-common.h"
6 #include "qemu-option.h"
7 #include "qobject.h"
9 /* block.c */
10 typedef struct BlockDriver BlockDriver;
12 typedef struct BlockDriverInfo {
13 /* in bytes, 0 if irrelevant */
14 int cluster_size;
15 /* offset at which the VM state can be saved (0 if not possible) */
16 int64_t vm_state_offset;
17 } BlockDriverInfo;
19 typedef struct QEMUSnapshotInfo {
20 char id_str[128]; /* unique snapshot id */
21 /* the following fields are informative. They are not needed for
22 the consistency of the snapshot */
23 char name[256]; /* user choosen name */
24 uint32_t vm_state_size; /* VM state info size */
25 uint32_t date_sec; /* UTC date of the snapshot */
26 uint32_t date_nsec;
27 uint64_t vm_clock_nsec; /* VM clock relative to boot */
28 } QEMUSnapshotInfo;
30 #define BDRV_O_RDWR 0x0002
31 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
32 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
33 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
34 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
35 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
36 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
38 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
40 #define BDRV_SECTOR_BITS 9
41 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
42 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
44 typedef enum {
45 BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
46 BLOCK_ERR_STOP_ANY
47 } BlockErrorAction;
49 typedef enum {
50 BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
51 } BlockMonEventAction;
53 void bdrv_mon_event(const BlockDriverState *bdrv,
54 BlockMonEventAction action, int is_read);
55 void bdrv_info_print(Monitor *mon, const QObject *data);
56 void bdrv_info(Monitor *mon, QObject **ret_data);
57 void bdrv_stats_print(Monitor *mon, const QObject *data);
58 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
60 void bdrv_init(void);
61 void bdrv_init_with_whitelist(void);
62 BlockDriver *bdrv_find_protocol(const char *filename);
63 BlockDriver *bdrv_find_format(const char *format_name);
64 BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
65 int bdrv_create(BlockDriver *drv, const char* filename,
66 QEMUOptionParameter *options);
67 int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
68 BlockDriverState *bdrv_new(const char *device_name);
69 void bdrv_delete(BlockDriverState *bs);
70 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
71 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
72 BlockDriver *drv);
73 void bdrv_close(BlockDriverState *bs);
74 int bdrv_attach(BlockDriverState *bs, DeviceState *qdev);
75 void bdrv_detach(BlockDriverState *bs, DeviceState *qdev);
76 DeviceState *bdrv_get_attached(BlockDriverState *bs);
77 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
78 uint8_t *buf, int nb_sectors);
79 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
80 const uint8_t *buf, int nb_sectors);
81 int bdrv_pread(BlockDriverState *bs, int64_t offset,
82 void *buf, int count);
83 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
84 const void *buf, int count);
85 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
86 const void *buf, int count);
87 int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
88 const uint8_t *buf, int nb_sectors);
89 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
90 int64_t bdrv_getlength(BlockDriverState *bs);
91 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
92 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
93 int bdrv_commit(BlockDriverState *bs);
94 void bdrv_commit_all(void);
95 int bdrv_change_backing_file(BlockDriverState *bs,
96 const char *backing_file, const char *backing_fmt);
97 void bdrv_register(BlockDriver *bdrv);
100 typedef struct BdrvCheckResult {
101 int corruptions;
102 int leaks;
103 int check_errors;
104 } BdrvCheckResult;
106 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res);
108 /* async block I/O */
109 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
110 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
111 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
112 int sector_num);
113 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
114 QEMUIOVector *iov, int nb_sectors,
115 BlockDriverCompletionFunc *cb, void *opaque);
116 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
117 QEMUIOVector *iov, int nb_sectors,
118 BlockDriverCompletionFunc *cb, void *opaque);
119 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
120 BlockDriverCompletionFunc *cb, void *opaque);
121 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
123 typedef struct BlockRequest {
124 /* Fields to be filled by multiwrite caller */
125 int64_t sector;
126 int nb_sectors;
127 QEMUIOVector *qiov;
128 BlockDriverCompletionFunc *cb;
129 void *opaque;
131 /* Filled by multiwrite implementation */
132 int error;
133 } BlockRequest;
135 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
136 int num_reqs);
138 /* sg packet commands */
139 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
140 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
141 unsigned long int req, void *buf,
142 BlockDriverCompletionFunc *cb, void *opaque);
144 /* Ensure contents are flushed to disk. */
145 int bdrv_flush(BlockDriverState *bs);
146 void bdrv_flush_all(void);
147 void bdrv_close_all(void);
149 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
150 int bdrv_has_zero_init(BlockDriverState *bs);
151 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
152 int *pnum);
154 #define BDRV_TYPE_HD 0
155 #define BDRV_TYPE_CDROM 1
156 #define BDRV_TYPE_FLOPPY 2
157 #define BIOS_ATA_TRANSLATION_AUTO 0
158 #define BIOS_ATA_TRANSLATION_NONE 1
159 #define BIOS_ATA_TRANSLATION_LBA 2
160 #define BIOS_ATA_TRANSLATION_LARGE 3
161 #define BIOS_ATA_TRANSLATION_RECHS 4
163 void bdrv_set_geometry_hint(BlockDriverState *bs,
164 int cyls, int heads, int secs);
165 void bdrv_set_type_hint(BlockDriverState *bs, int type);
166 void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
167 void bdrv_get_geometry_hint(BlockDriverState *bs,
168 int *pcyls, int *pheads, int *psecs);
169 typedef enum FDriveType {
170 FDRIVE_DRV_144 = 0x00, /* 1.44 MB 3"5 drive */
171 FDRIVE_DRV_288 = 0x01, /* 2.88 MB 3"5 drive */
172 FDRIVE_DRV_120 = 0x02, /* 1.2 MB 5"25 drive */
173 FDRIVE_DRV_NONE = 0x03, /* No drive connected */
174 } FDriveType;
176 void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
177 int *max_track, int *last_sect,
178 FDriveType drive_in, FDriveType *drive);
179 int bdrv_get_type_hint(BlockDriverState *bs);
180 int bdrv_get_translation_hint(BlockDriverState *bs);
181 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
182 BlockErrorAction on_write_error);
183 BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
184 void bdrv_set_removable(BlockDriverState *bs, int removable);
185 int bdrv_is_removable(BlockDriverState *bs);
186 int bdrv_is_read_only(BlockDriverState *bs);
187 int bdrv_is_sg(BlockDriverState *bs);
188 int bdrv_enable_write_cache(BlockDriverState *bs);
189 int bdrv_is_inserted(BlockDriverState *bs);
190 int bdrv_media_changed(BlockDriverState *bs);
191 int bdrv_is_locked(BlockDriverState *bs);
192 void bdrv_set_locked(BlockDriverState *bs, int locked);
193 int bdrv_eject(BlockDriverState *bs, int eject_flag);
194 void bdrv_set_change_cb(BlockDriverState *bs,
195 void (*change_cb)(void *opaque, int reason),
196 void *opaque);
197 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
198 BlockDriverState *bdrv_find(const char *name);
199 BlockDriverState *bdrv_next(BlockDriverState *bs);
200 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
201 void *opaque);
202 int bdrv_is_encrypted(BlockDriverState *bs);
203 int bdrv_key_required(BlockDriverState *bs);
204 int bdrv_set_key(BlockDriverState *bs, const char *key);
205 int bdrv_query_missing_keys(void);
206 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
207 void *opaque);
208 const char *bdrv_get_device_name(BlockDriverState *bs);
209 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
210 const uint8_t *buf, int nb_sectors);
211 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
213 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
214 void bdrv_get_backing_filename(BlockDriverState *bs,
215 char *filename, int filename_size);
216 int bdrv_can_snapshot(BlockDriverState *bs);
217 int bdrv_is_snapshot(BlockDriverState *bs);
218 BlockDriverState *bdrv_snapshots(void);
219 int bdrv_snapshot_create(BlockDriverState *bs,
220 QEMUSnapshotInfo *sn_info);
221 int bdrv_snapshot_goto(BlockDriverState *bs,
222 const char *snapshot_id);
223 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
224 int bdrv_snapshot_list(BlockDriverState *bs,
225 QEMUSnapshotInfo **psn_info);
226 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
227 const char *snapshot_name);
228 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
230 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
231 int path_is_absolute(const char *path);
232 void path_combine(char *dest, int dest_size,
233 const char *base_path,
234 const char *filename);
236 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
237 int64_t pos, int size);
239 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
240 int64_t pos, int size);
242 int bdrv_img_create(const char *filename, const char *fmt,
243 const char *base_filename, const char *base_fmt,
244 char *options, uint64_t img_size, int flags);
246 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
248 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
249 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
250 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
251 int nr_sectors);
252 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
254 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
255 int bdrv_in_use(BlockDriverState *bs);
257 typedef enum {
258 BLKDBG_L1_UPDATE,
260 BLKDBG_L1_GROW_ALLOC_TABLE,
261 BLKDBG_L1_GROW_WRITE_TABLE,
262 BLKDBG_L1_GROW_ACTIVATE_TABLE,
264 BLKDBG_L2_LOAD,
265 BLKDBG_L2_UPDATE,
266 BLKDBG_L2_UPDATE_COMPRESSED,
267 BLKDBG_L2_ALLOC_COW_READ,
268 BLKDBG_L2_ALLOC_WRITE,
270 BLKDBG_READ,
271 BLKDBG_READ_AIO,
272 BLKDBG_READ_BACKING,
273 BLKDBG_READ_BACKING_AIO,
274 BLKDBG_READ_COMPRESSED,
276 BLKDBG_WRITE_AIO,
277 BLKDBG_WRITE_COMPRESSED,
279 BLKDBG_VMSTATE_LOAD,
280 BLKDBG_VMSTATE_SAVE,
282 BLKDBG_COW_READ,
283 BLKDBG_COW_WRITE,
285 BLKDBG_REFTABLE_LOAD,
286 BLKDBG_REFTABLE_GROW,
288 BLKDBG_REFBLOCK_LOAD,
289 BLKDBG_REFBLOCK_UPDATE,
290 BLKDBG_REFBLOCK_UPDATE_PART,
291 BLKDBG_REFBLOCK_ALLOC,
292 BLKDBG_REFBLOCK_ALLOC_HOOKUP,
293 BLKDBG_REFBLOCK_ALLOC_WRITE,
294 BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
295 BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
296 BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
298 BLKDBG_CLUSTER_ALLOC,
299 BLKDBG_CLUSTER_ALLOC_BYTES,
300 BLKDBG_CLUSTER_FREE,
302 BLKDBG_EVENT_MAX,
303 } BlkDebugEvent;
305 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
306 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
308 #endif