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1 | /* |
2 | * Copyright (C) 2001 Sistina Software (UK) Limited. |
3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
4 | * |
5 | * This file is released under the LGPL. |
6 | */ |
7 | |
8 | #ifndef _LINUX_DEVICE_MAPPER_H |
9 | #define _LINUX_DEVICE_MAPPER_H |
10 | |
11 | #include <linux/bio.h> |
12 | #include <linux/blkdev.h> |
13 | #include <linux/math64.h> |
14 | #include <linux/ratelimit.h> |
15 | |
16 | struct dm_dev; |
17 | struct dm_target; |
18 | struct dm_table; |
19 | struct mapped_device; |
20 | struct bio_vec; |
21 | |
22 | typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; |
23 | |
24 | union map_info { |
25 | void *ptr; |
26 | unsigned long long ll; |
27 | }; |
28 | |
29 | /* |
30 | * In the constructor the target parameter will already have the |
31 | * table, type, begin and len fields filled in. |
32 | */ |
33 | typedef int (*dm_ctr_fn) (struct dm_target *target, |
34 | unsigned int argc, char **argv); |
35 | |
36 | /* |
37 | * The destructor doesn't need to free the dm_target, just |
38 | * anything hidden ti->private. |
39 | */ |
40 | typedef void (*dm_dtr_fn) (struct dm_target *ti); |
41 | |
42 | /* |
43 | * The map function must return: |
44 | * < 0: error |
45 | * = 0: The target will handle the io by resubmitting it later |
46 | * = 1: simple remap complete |
47 | * = 2: The target wants to push back the io |
48 | */ |
49 | typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); |
50 | typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone, |
51 | union map_info *map_context); |
52 | |
53 | /* |
54 | * Returns: |
55 | * < 0 : error (currently ignored) |
56 | * 0 : ended successfully |
57 | * 1 : for some reason the io has still not completed (eg, |
58 | * multipath target might want to requeue a failed io). |
59 | * 2 : The target wants to push back the io |
60 | */ |
61 | typedef int (*dm_endio_fn) (struct dm_target *ti, |
62 | struct bio *bio, int error); |
63 | typedef int (*dm_request_endio_fn) (struct dm_target *ti, |
64 | struct request *clone, int error, |
65 | union map_info *map_context); |
66 | |
67 | typedef void (*dm_presuspend_fn) (struct dm_target *ti); |
68 | typedef void (*dm_postsuspend_fn) (struct dm_target *ti); |
69 | typedef int (*dm_preresume_fn) (struct dm_target *ti); |
70 | typedef void (*dm_resume_fn) (struct dm_target *ti); |
71 | |
72 | typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, |
73 | unsigned status_flags, char *result, unsigned maxlen); |
74 | |
75 | typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv); |
76 | |
77 | typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd, |
78 | unsigned long arg); |
79 | |
80 | typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm, |
81 | struct bio_vec *biovec, int max_size); |
82 | |
83 | /* |
84 | * These iteration functions are typically used to check (and combine) |
85 | * properties of underlying devices. |
86 | * E.g. Does at least one underlying device support flush? |
87 | * Does any underlying device not support WRITE_SAME? |
88 | * |
89 | * The callout function is called once for each contiguous section of |
90 | * an underlying device. State can be maintained in *data. |
91 | * Return non-zero to stop iterating through any further devices. |
92 | */ |
93 | typedef int (*iterate_devices_callout_fn) (struct dm_target *ti, |
94 | struct dm_dev *dev, |
95 | sector_t start, sector_t len, |
96 | void *data); |
97 | |
98 | /* |
99 | * This function must iterate through each section of device used by the |
100 | * target until it encounters a non-zero return code, which it then returns. |
101 | * Returns zero if no callout returned non-zero. |
102 | */ |
103 | typedef int (*dm_iterate_devices_fn) (struct dm_target *ti, |
104 | iterate_devices_callout_fn fn, |
105 | void *data); |
106 | |
107 | typedef void (*dm_io_hints_fn) (struct dm_target *ti, |
108 | struct queue_limits *limits); |
109 | |
110 | /* |
111 | * Returns: |
112 | * 0: The target can handle the next I/O immediately. |
113 | * 1: The target can't handle the next I/O immediately. |
114 | */ |
115 | typedef int (*dm_busy_fn) (struct dm_target *ti); |
116 | |
117 | void dm_error(const char *message); |
118 | |
119 | /* |
120 | * Combine device limits. |
121 | */ |
122 | int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
123 | sector_t start, sector_t len, void *data); |
124 | |
125 | struct dm_dev { |
126 | struct block_device *bdev; |
127 | fmode_t mode; |
128 | char name[16]; |
129 | }; |
130 | |
131 | /* |
132 | * Constructors should call these functions to ensure destination devices |
133 | * are opened/closed correctly. |
134 | */ |
135 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
136 | struct dm_dev **result); |
137 | void dm_put_device(struct dm_target *ti, struct dm_dev *d); |
138 | |
139 | /* |
140 | * Information about a target type |
141 | */ |
142 | |
143 | struct target_type { |
144 | uint64_t features; |
145 | const char *name; |
146 | struct module *module; |
147 | unsigned version[3]; |
148 | dm_ctr_fn ctr; |
149 | dm_dtr_fn dtr; |
150 | dm_map_fn map; |
151 | dm_map_request_fn map_rq; |
152 | dm_endio_fn end_io; |
153 | dm_request_endio_fn rq_end_io; |
154 | dm_presuspend_fn presuspend; |
155 | dm_postsuspend_fn postsuspend; |
156 | dm_preresume_fn preresume; |
157 | dm_resume_fn resume; |
158 | dm_status_fn status; |
159 | dm_message_fn message; |
160 | dm_ioctl_fn ioctl; |
161 | dm_merge_fn merge; |
162 | dm_busy_fn busy; |
163 | dm_iterate_devices_fn iterate_devices; |
164 | dm_io_hints_fn io_hints; |
165 | |
166 | /* For internal device-mapper use. */ |
167 | struct list_head list; |
168 | }; |
169 | |
170 | /* |
171 | * Target features |
172 | */ |
173 | |
174 | /* |
175 | * Any table that contains an instance of this target must have only one. |
176 | */ |
177 | #define DM_TARGET_SINGLETON 0x00000001 |
178 | #define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON) |
179 | |
180 | /* |
181 | * Indicates that a target does not support read-only devices. |
182 | */ |
183 | #define DM_TARGET_ALWAYS_WRITEABLE 0x00000002 |
184 | #define dm_target_always_writeable(type) \ |
185 | ((type)->features & DM_TARGET_ALWAYS_WRITEABLE) |
186 | |
187 | /* |
188 | * Any device that contains a table with an instance of this target may never |
189 | * have tables containing any different target type. |
190 | */ |
191 | #define DM_TARGET_IMMUTABLE 0x00000004 |
192 | #define dm_target_is_immutable(type) ((type)->features & DM_TARGET_IMMUTABLE) |
193 | |
194 | /* |
195 | * Some targets need to be sent the same WRITE bio severals times so |
196 | * that they can send copies of it to different devices. This function |
197 | * examines any supplied bio and returns the number of copies of it the |
198 | * target requires. |
199 | */ |
200 | typedef unsigned (*dm_num_write_bios_fn) (struct dm_target *ti, struct bio *bio); |
201 | |
202 | struct dm_target { |
203 | struct dm_table *table; |
204 | struct target_type *type; |
205 | |
206 | /* target limits */ |
207 | sector_t begin; |
208 | sector_t len; |
209 | |
210 | /* If non-zero, maximum size of I/O submitted to a target. */ |
211 | uint32_t max_io_len; |
212 | |
213 | /* |
214 | * A number of zero-length barrier bios that will be submitted |
215 | * to the target for the purpose of flushing cache. |
216 | * |
217 | * The bio number can be accessed with dm_bio_get_target_bio_nr. |
218 | * It is a responsibility of the target driver to remap these bios |
219 | * to the real underlying devices. |
220 | */ |
221 | unsigned num_flush_bios; |
222 | |
223 | /* |
224 | * The number of discard bios that will be submitted to the target. |
225 | * The bio number can be accessed with dm_bio_get_target_bio_nr. |
226 | */ |
227 | unsigned num_discard_bios; |
228 | |
229 | /* |
230 | * The number of WRITE SAME bios that will be submitted to the target. |
231 | * The bio number can be accessed with dm_bio_get_target_bio_nr. |
232 | */ |
233 | unsigned num_write_same_bios; |
234 | |
235 | /* |
236 | * The minimum number of extra bytes allocated in each bio for the |
237 | * target to use. dm_per_bio_data returns the data location. |
238 | */ |
239 | unsigned per_bio_data_size; |
240 | |
241 | /* |
242 | * If defined, this function is called to find out how many |
243 | * duplicate bios should be sent to the target when writing |
244 | * data. |
245 | */ |
246 | dm_num_write_bios_fn num_write_bios; |
247 | |
248 | /* target specific data */ |
249 | void *private; |
250 | |
251 | /* Used to provide an error string from the ctr */ |
252 | char *error; |
253 | |
254 | /* |
255 | * Set if this target needs to receive flushes regardless of |
256 | * whether or not its underlying devices have support. |
257 | */ |
258 | bool flush_supported:1; |
259 | |
260 | /* |
261 | * Set if this target needs to receive discards regardless of |
262 | * whether or not its underlying devices have support. |
263 | */ |
264 | bool discards_supported:1; |
265 | |
266 | /* |
267 | * Set if the target required discard bios to be split |
268 | * on max_io_len boundary. |
269 | */ |
270 | bool split_discard_bios:1; |
271 | |
272 | /* |
273 | * Set if this target does not return zeroes on discarded blocks. |
274 | */ |
275 | bool discard_zeroes_data_unsupported:1; |
276 | }; |
277 | |
278 | /* Each target can link one of these into the table */ |
279 | struct dm_target_callbacks { |
280 | struct list_head list; |
281 | int (*congested_fn) (struct dm_target_callbacks *, int); |
282 | }; |
283 | |
284 | /* |
285 | * For bio-based dm. |
286 | * One of these is allocated for each bio. |
287 | * This structure shouldn't be touched directly by target drivers. |
288 | * It is here so that we can inline dm_per_bio_data and |
289 | * dm_bio_from_per_bio_data |
290 | */ |
291 | struct dm_target_io { |
292 | struct dm_io *io; |
293 | struct dm_target *ti; |
294 | union map_info info; |
295 | unsigned target_bio_nr; |
296 | struct bio clone; |
297 | }; |
298 | |
299 | static inline void *dm_per_bio_data(struct bio *bio, size_t data_size) |
300 | { |
301 | return (char *)bio - offsetof(struct dm_target_io, clone) - data_size; |
302 | } |
303 | |
304 | static inline struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) |
305 | { |
306 | return (struct bio *)((char *)data + data_size + offsetof(struct dm_target_io, clone)); |
307 | } |
308 | |
309 | static inline unsigned dm_bio_get_target_bio_nr(const struct bio *bio) |
310 | { |
311 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; |
312 | } |
313 | |
314 | int dm_register_target(struct target_type *t); |
315 | void dm_unregister_target(struct target_type *t); |
316 | |
317 | /* |
318 | * Target argument parsing. |
319 | */ |
320 | struct dm_arg_set { |
321 | unsigned argc; |
322 | char **argv; |
323 | }; |
324 | |
325 | /* |
326 | * The minimum and maximum value of a numeric argument, together with |
327 | * the error message to use if the number is found to be outside that range. |
328 | */ |
329 | struct dm_arg { |
330 | unsigned min; |
331 | unsigned max; |
332 | char *error; |
333 | }; |
334 | |
335 | /* |
336 | * Validate the next argument, either returning it as *value or, if invalid, |
337 | * returning -EINVAL and setting *error. |
338 | */ |
339 | int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, |
340 | unsigned *value, char **error); |
341 | |
342 | /* |
343 | * Process the next argument as the start of a group containing between |
344 | * arg->min and arg->max further arguments. Either return the size as |
345 | * *num_args or, if invalid, return -EINVAL and set *error. |
346 | */ |
347 | int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set, |
348 | unsigned *num_args, char **error); |
349 | |
350 | /* |
351 | * Return the current argument and shift to the next. |
352 | */ |
353 | const char *dm_shift_arg(struct dm_arg_set *as); |
354 | |
355 | /* |
356 | * Move through num_args arguments. |
357 | */ |
358 | void dm_consume_args(struct dm_arg_set *as, unsigned num_args); |
359 | |
360 | /*----------------------------------------------------------------- |
361 | * Functions for creating and manipulating mapped devices. |
362 | * Drop the reference with dm_put when you finish with the object. |
363 | *---------------------------------------------------------------*/ |
364 | |
365 | /* |
366 | * DM_ANY_MINOR chooses the next available minor number. |
367 | */ |
368 | #define DM_ANY_MINOR (-1) |
369 | int dm_create(int minor, struct mapped_device **md); |
370 | |
371 | /* |
372 | * Reference counting for md. |
373 | */ |
374 | struct mapped_device *dm_get_md(dev_t dev); |
375 | void dm_get(struct mapped_device *md); |
376 | void dm_put(struct mapped_device *md); |
377 | |
378 | /* |
379 | * An arbitrary pointer may be stored alongside a mapped device. |
380 | */ |
381 | void dm_set_mdptr(struct mapped_device *md, void *ptr); |
382 | void *dm_get_mdptr(struct mapped_device *md); |
383 | |
384 | /* |
385 | * A device can still be used while suspended, but I/O is deferred. |
386 | */ |
387 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags); |
388 | int dm_resume(struct mapped_device *md); |
389 | |
390 | /* |
391 | * Event functions. |
392 | */ |
393 | uint32_t dm_get_event_nr(struct mapped_device *md); |
394 | int dm_wait_event(struct mapped_device *md, int event_nr); |
395 | uint32_t dm_next_uevent_seq(struct mapped_device *md); |
396 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist); |
397 | |
398 | /* |
399 | * Info functions. |
400 | */ |
401 | const char *dm_device_name(struct mapped_device *md); |
402 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid); |
403 | struct gendisk *dm_disk(struct mapped_device *md); |
404 | int dm_suspended(struct dm_target *ti); |
405 | int dm_noflush_suspending(struct dm_target *ti); |
406 | union map_info *dm_get_mapinfo(struct bio *bio); |
407 | union map_info *dm_get_rq_mapinfo(struct request *rq); |
408 | |
409 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md); |
410 | |
411 | /* |
412 | * Geometry functions. |
413 | */ |
414 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo); |
415 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo); |
416 | |
417 | /*----------------------------------------------------------------- |
418 | * Functions for manipulating device-mapper tables. |
419 | *---------------------------------------------------------------*/ |
420 | |
421 | /* |
422 | * First create an empty table. |
423 | */ |
424 | int dm_table_create(struct dm_table **result, fmode_t mode, |
425 | unsigned num_targets, struct mapped_device *md); |
426 | |
427 | /* |
428 | * Then call this once for each target. |
429 | */ |
430 | int dm_table_add_target(struct dm_table *t, const char *type, |
431 | sector_t start, sector_t len, char *params); |
432 | |
433 | /* |
434 | * Target_ctr should call this if it needs to add any callbacks. |
435 | */ |
436 | void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb); |
437 | |
438 | /* |
439 | * Finally call this to make the table ready for use. |
440 | */ |
441 | int dm_table_complete(struct dm_table *t); |
442 | |
443 | /* |
444 | * Target may require that it is never sent I/O larger than len. |
445 | */ |
446 | int __must_check dm_set_target_max_io_len(struct dm_target *ti, sector_t len); |
447 | |
448 | /* |
449 | * Table reference counting. |
450 | */ |
451 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx); |
452 | void dm_put_live_table(struct mapped_device *md, int srcu_idx); |
453 | void dm_sync_table(struct mapped_device *md); |
454 | |
455 | /* |
456 | * Queries |
457 | */ |
458 | sector_t dm_table_get_size(struct dm_table *t); |
459 | unsigned int dm_table_get_num_targets(struct dm_table *t); |
460 | fmode_t dm_table_get_mode(struct dm_table *t); |
461 | struct mapped_device *dm_table_get_md(struct dm_table *t); |
462 | |
463 | /* |
464 | * Trigger an event. |
465 | */ |
466 | void dm_table_event(struct dm_table *t); |
467 | |
468 | /* |
469 | * The device must be suspended before calling this method. |
470 | * Returns the previous table, which the caller must destroy. |
471 | */ |
472 | struct dm_table *dm_swap_table(struct mapped_device *md, |
473 | struct dm_table *t); |
474 | |
475 | /* |
476 | * A wrapper around vmalloc. |
477 | */ |
478 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); |
479 | |
480 | /*----------------------------------------------------------------- |
481 | * Macros. |
482 | *---------------------------------------------------------------*/ |
483 | #define DM_NAME "device-mapper" |
484 | |
485 | #ifdef CONFIG_PRINTK |
486 | extern struct ratelimit_state dm_ratelimit_state; |
487 | |
488 | #define dm_ratelimit() __ratelimit(&dm_ratelimit_state) |
489 | #else |
490 | #define dm_ratelimit() 0 |
491 | #endif |
492 | |
493 | #define DMCRIT(f, arg...) \ |
494 | printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) |
495 | |
496 | #define DMERR(f, arg...) \ |
497 | printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) |
498 | #define DMERR_LIMIT(f, arg...) \ |
499 | do { \ |
500 | if (dm_ratelimit()) \ |
501 | printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \ |
502 | f "\n", ## arg); \ |
503 | } while (0) |
504 | |
505 | #define DMWARN(f, arg...) \ |
506 | printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) |
507 | #define DMWARN_LIMIT(f, arg...) \ |
508 | do { \ |
509 | if (dm_ratelimit()) \ |
510 | printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \ |
511 | f "\n", ## arg); \ |
512 | } while (0) |
513 | |
514 | #define DMINFO(f, arg...) \ |
515 | printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) |
516 | #define DMINFO_LIMIT(f, arg...) \ |
517 | do { \ |
518 | if (dm_ratelimit()) \ |
519 | printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \ |
520 | "\n", ## arg); \ |
521 | } while (0) |
522 | |
523 | #ifdef CONFIG_DM_DEBUG |
524 | # define DMDEBUG(f, arg...) \ |
525 | printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg) |
526 | # define DMDEBUG_LIMIT(f, arg...) \ |
527 | do { \ |
528 | if (dm_ratelimit()) \ |
529 | printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \ |
530 | "\n", ## arg); \ |
531 | } while (0) |
532 | #else |
533 | # define DMDEBUG(f, arg...) do {} while (0) |
534 | # define DMDEBUG_LIMIT(f, arg...) do {} while (0) |
535 | #endif |
536 | |
537 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ |
538 | 0 : scnprintf(result + sz, maxlen - sz, x)) |
539 | |
540 | #define SECTOR_SHIFT 9 |
541 | |
542 | /* |
543 | * Definitions of return values from target end_io function. |
544 | */ |
545 | #define DM_ENDIO_INCOMPLETE 1 |
546 | #define DM_ENDIO_REQUEUE 2 |
547 | |
548 | /* |
549 | * Definitions of return values from target map function. |
550 | */ |
551 | #define DM_MAPIO_SUBMITTED 0 |
552 | #define DM_MAPIO_REMAPPED 1 |
553 | #define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE |
554 | |
555 | #define dm_sector_div64(x, y)( \ |
556 | { \ |
557 | u64 _res; \ |
558 | (x) = div64_u64_rem(x, y, &_res); \ |
559 | _res; \ |
560 | } \ |
561 | ) |
562 | |
563 | /* |
564 | * Ceiling(n / sz) |
565 | */ |
566 | #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) |
567 | |
568 | #define dm_sector_div_up(n, sz) ( \ |
569 | { \ |
570 | sector_t _r = ((n) + (sz) - 1); \ |
571 | sector_div(_r, (sz)); \ |
572 | _r; \ |
573 | } \ |
574 | ) |
575 | |
576 | /* |
577 | * ceiling(n / size) * size |
578 | */ |
579 | #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) |
580 | |
581 | #define dm_array_too_big(fixed, obj, num) \ |
582 | ((num) > (UINT_MAX - (fixed)) / (obj)) |
583 | |
584 | /* |
585 | * Sector offset taken relative to the start of the target instead of |
586 | * relative to the start of the device. |
587 | */ |
588 | #define dm_target_offset(ti, sector) ((sector) - (ti)->begin) |
589 | |
590 | static inline sector_t to_sector(unsigned long n) |
591 | { |
592 | return (n >> SECTOR_SHIFT); |
593 | } |
594 | |
595 | static inline unsigned long to_bytes(sector_t n) |
596 | { |
597 | return (n << SECTOR_SHIFT); |
598 | } |
599 | |
600 | /*----------------------------------------------------------------- |
601 | * Helper for block layer and dm core operations |
602 | *---------------------------------------------------------------*/ |
603 | void dm_dispatch_request(struct request *rq); |
604 | void dm_requeue_unmapped_request(struct request *rq); |
605 | void dm_kill_unmapped_request(struct request *rq, int error); |
606 | int dm_underlying_device_busy(struct request_queue *q); |
607 | |
608 | #endif /* _LINUX_DEVICE_MAPPER_H */ |
609 |
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