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Linux/include/linux/device-mapper.h

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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 /*
 23  * Type of table, mapped_device's mempool and request_queue
 24  */
 25 enum dm_queue_mode {
 26         DM_TYPE_NONE             = 0,
 27         DM_TYPE_BIO_BASED        = 1,
 28         DM_TYPE_REQUEST_BASED    = 2,
 29         DM_TYPE_MQ_REQUEST_BASED = 3,
 30         DM_TYPE_DAX_BIO_BASED    = 4,
 31         DM_TYPE_NVME_BIO_BASED   = 5,
 32 };
 33 
 34 typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
 35 
 36 union map_info {
 37         void *ptr;
 38 };
 39 
 40 /*
 41  * In the constructor the target parameter will already have the
 42  * table, type, begin and len fields filled in.
 43  */
 44 typedef int (*dm_ctr_fn) (struct dm_target *target,
 45                           unsigned int argc, char **argv);
 46 
 47 /*
 48  * The destructor doesn't need to free the dm_target, just
 49  * anything hidden ti->private.
 50  */
 51 typedef void (*dm_dtr_fn) (struct dm_target *ti);
 52 
 53 /*
 54  * The map function must return:
 55  * < 0: error
 56  * = 0: The target will handle the io by resubmitting it later
 57  * = 1: simple remap complete
 58  * = 2: The target wants to push back the io
 59  */
 60 typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio);
 61 typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti,
 62                                             struct request *rq,
 63                                             union map_info *map_context,
 64                                             struct request **clone);
 65 typedef void (*dm_release_clone_request_fn) (struct request *clone);
 66 
 67 /*
 68  * Returns:
 69  * < 0 : error (currently ignored)
 70  * 0   : ended successfully
 71  * 1   : for some reason the io has still not completed (eg,
 72  *       multipath target might want to requeue a failed io).
 73  * 2   : The target wants to push back the io
 74  */
 75 typedef int (*dm_endio_fn) (struct dm_target *ti,
 76                             struct bio *bio, blk_status_t *error);
 77 typedef int (*dm_request_endio_fn) (struct dm_target *ti,
 78                                     struct request *clone, blk_status_t error,
 79                                     union map_info *map_context);
 80 
 81 typedef void (*dm_presuspend_fn) (struct dm_target *ti);
 82 typedef void (*dm_presuspend_undo_fn) (struct dm_target *ti);
 83 typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
 84 typedef int (*dm_preresume_fn) (struct dm_target *ti);
 85 typedef void (*dm_resume_fn) (struct dm_target *ti);
 86 
 87 typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
 88                               unsigned status_flags, char *result, unsigned maxlen);
 89 
 90 typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv,
 91                               char *result, unsigned maxlen);
 92 
 93 typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti, struct block_device **bdev);
 94 
 95 /*
 96  * These iteration functions are typically used to check (and combine)
 97  * properties of underlying devices.
 98  * E.g. Does at least one underlying device support flush?
 99  *      Does any underlying device not support WRITE_SAME?
100  *
101  * The callout function is called once for each contiguous section of
102  * an underlying device.  State can be maintained in *data.
103  * Return non-zero to stop iterating through any further devices.
104  */
105 typedef int (*iterate_devices_callout_fn) (struct dm_target *ti,
106                                            struct dm_dev *dev,
107                                            sector_t start, sector_t len,
108                                            void *data);
109 
110 /*
111  * This function must iterate through each section of device used by the
112  * target until it encounters a non-zero return code, which it then returns.
113  * Returns zero if no callout returned non-zero.
114  */
115 typedef int (*dm_iterate_devices_fn) (struct dm_target *ti,
116                                       iterate_devices_callout_fn fn,
117                                       void *data);
118 
119 typedef void (*dm_io_hints_fn) (struct dm_target *ti,
120                                 struct queue_limits *limits);
121 
122 /*
123  * Returns:
124  *    0: The target can handle the next I/O immediately.
125  *    1: The target can't handle the next I/O immediately.
126  */
127 typedef int (*dm_busy_fn) (struct dm_target *ti);
128 
129 /*
130  * Returns:
131  *  < 0 : error
132  * >= 0 : the number of bytes accessible at the address
133  */
134 typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff,
135                 long nr_pages, void **kaddr, pfn_t *pfn);
136 typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff,
137                 void *addr, size_t bytes, struct iov_iter *i);
138 #define PAGE_SECTORS (PAGE_SIZE / 512)
139 
140 void dm_error(const char *message);
141 
142 struct dm_dev {
143         struct block_device *bdev;
144         struct dax_device *dax_dev;
145         fmode_t mode;
146         char name[16];
147 };
148 
149 dev_t dm_get_dev_t(const char *path);
150 
151 /*
152  * Constructors should call these functions to ensure destination devices
153  * are opened/closed correctly.
154  */
155 int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
156                   struct dm_dev **result);
157 void dm_put_device(struct dm_target *ti, struct dm_dev *d);
158 
159 /*
160  * Information about a target type
161  */
162 
163 struct target_type {
164         uint64_t features;
165         const char *name;
166         struct module *module;
167         unsigned version[3];
168         dm_ctr_fn ctr;
169         dm_dtr_fn dtr;
170         dm_map_fn map;
171         dm_clone_and_map_request_fn clone_and_map_rq;
172         dm_release_clone_request_fn release_clone_rq;
173         dm_endio_fn end_io;
174         dm_request_endio_fn rq_end_io;
175         dm_presuspend_fn presuspend;
176         dm_presuspend_undo_fn presuspend_undo;
177         dm_postsuspend_fn postsuspend;
178         dm_preresume_fn preresume;
179         dm_resume_fn resume;
180         dm_status_fn status;
181         dm_message_fn message;
182         dm_prepare_ioctl_fn prepare_ioctl;
183         dm_busy_fn busy;
184         dm_iterate_devices_fn iterate_devices;
185         dm_io_hints_fn io_hints;
186         dm_dax_direct_access_fn direct_access;
187         dm_dax_copy_iter_fn dax_copy_from_iter;
188         dm_dax_copy_iter_fn dax_copy_to_iter;
189 
190         /* For internal device-mapper use. */
191         struct list_head list;
192 };
193 
194 /*
195  * Target features
196  */
197 
198 /*
199  * Any table that contains an instance of this target must have only one.
200  */
201 #define DM_TARGET_SINGLETON             0x00000001
202 #define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON)
203 
204 /*
205  * Indicates that a target does not support read-only devices.
206  */
207 #define DM_TARGET_ALWAYS_WRITEABLE      0x00000002
208 #define dm_target_always_writeable(type) \
209                 ((type)->features & DM_TARGET_ALWAYS_WRITEABLE)
210 
211 /*
212  * Any device that contains a table with an instance of this target may never
213  * have tables containing any different target type.
214  */
215 #define DM_TARGET_IMMUTABLE             0x00000004
216 #define dm_target_is_immutable(type)    ((type)->features & DM_TARGET_IMMUTABLE)
217 
218 /*
219  * Indicates that a target may replace any target; even immutable targets.
220  * .map, .map_rq, .clone_and_map_rq and .release_clone_rq are all defined.
221  */
222 #define DM_TARGET_WILDCARD              0x00000008
223 #define dm_target_is_wildcard(type)     ((type)->features & DM_TARGET_WILDCARD)
224 
225 /*
226  * A target implements own bio data integrity.
227  */
228 #define DM_TARGET_INTEGRITY             0x00000010
229 #define dm_target_has_integrity(type)   ((type)->features & DM_TARGET_INTEGRITY)
230 
231 /*
232  * A target passes integrity data to the lower device.
233  */
234 #define DM_TARGET_PASSES_INTEGRITY      0x00000020
235 #define dm_target_passes_integrity(type) ((type)->features & DM_TARGET_PASSES_INTEGRITY)
236 
237 /*
238  * Indicates that a target supports host-managed zoned block devices.
239  */
240 #define DM_TARGET_ZONED_HM              0x00000040
241 #define dm_target_supports_zoned_hm(type) ((type)->features & DM_TARGET_ZONED_HM)
242 
243 struct dm_target {
244         struct dm_table *table;
245         struct target_type *type;
246 
247         /* target limits */
248         sector_t begin;
249         sector_t len;
250 
251         /* If non-zero, maximum size of I/O submitted to a target. */
252         uint32_t max_io_len;
253 
254         /*
255          * A number of zero-length barrier bios that will be submitted
256          * to the target for the purpose of flushing cache.
257          *
258          * The bio number can be accessed with dm_bio_get_target_bio_nr.
259          * It is a responsibility of the target driver to remap these bios
260          * to the real underlying devices.
261          */
262         unsigned num_flush_bios;
263 
264         /*
265          * The number of discard bios that will be submitted to the target.
266          * The bio number can be accessed with dm_bio_get_target_bio_nr.
267          */
268         unsigned num_discard_bios;
269 
270         /*
271          * The number of secure erase bios that will be submitted to the target.
272          * The bio number can be accessed with dm_bio_get_target_bio_nr.
273          */
274         unsigned num_secure_erase_bios;
275 
276         /*
277          * The number of WRITE SAME bios that will be submitted to the target.
278          * The bio number can be accessed with dm_bio_get_target_bio_nr.
279          */
280         unsigned num_write_same_bios;
281 
282         /*
283          * The number of WRITE ZEROES bios that will be submitted to the target.
284          * The bio number can be accessed with dm_bio_get_target_bio_nr.
285          */
286         unsigned num_write_zeroes_bios;
287 
288         /*
289          * The minimum number of extra bytes allocated in each io for the
290          * target to use.
291          */
292         unsigned per_io_data_size;
293 
294         /* target specific data */
295         void *private;
296 
297         /* Used to provide an error string from the ctr */
298         char *error;
299 
300         /*
301          * Set if this target needs to receive flushes regardless of
302          * whether or not its underlying devices have support.
303          */
304         bool flush_supported:1;
305 
306         /*
307          * Set if this target needs to receive discards regardless of
308          * whether or not its underlying devices have support.
309          */
310         bool discards_supported:1;
311 
312         /*
313          * Set if the target required discard bios to be split
314          * on max_io_len boundary.
315          */
316         bool split_discard_bios:1;
317 };
318 
319 /* Each target can link one of these into the table */
320 struct dm_target_callbacks {
321         struct list_head list;
322         int (*congested_fn) (struct dm_target_callbacks *, int);
323 };
324 
325 void *dm_per_bio_data(struct bio *bio, size_t data_size);
326 struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size);
327 unsigned dm_bio_get_target_bio_nr(const struct bio *bio);
328 
329 int dm_register_target(struct target_type *t);
330 void dm_unregister_target(struct target_type *t);
331 
332 /*
333  * Target argument parsing.
334  */
335 struct dm_arg_set {
336         unsigned argc;
337         char **argv;
338 };
339 
340 /*
341  * The minimum and maximum value of a numeric argument, together with
342  * the error message to use if the number is found to be outside that range.
343  */
344 struct dm_arg {
345         unsigned min;
346         unsigned max;
347         char *error;
348 };
349 
350 /*
351  * Validate the next argument, either returning it as *value or, if invalid,
352  * returning -EINVAL and setting *error.
353  */
354 int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
355                 unsigned *value, char **error);
356 
357 /*
358  * Process the next argument as the start of a group containing between
359  * arg->min and arg->max further arguments. Either return the size as
360  * *num_args or, if invalid, return -EINVAL and set *error.
361  */
362 int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
363                       unsigned *num_args, char **error);
364 
365 /*
366  * Return the current argument and shift to the next.
367  */
368 const char *dm_shift_arg(struct dm_arg_set *as);
369 
370 /*
371  * Move through num_args arguments.
372  */
373 void dm_consume_args(struct dm_arg_set *as, unsigned num_args);
374 
375 /*-----------------------------------------------------------------
376  * Functions for creating and manipulating mapped devices.
377  * Drop the reference with dm_put when you finish with the object.
378  *---------------------------------------------------------------*/
379 
380 /*
381  * DM_ANY_MINOR chooses the next available minor number.
382  */
383 #define DM_ANY_MINOR (-1)
384 int dm_create(int minor, struct mapped_device **md);
385 
386 /*
387  * Reference counting for md.
388  */
389 struct mapped_device *dm_get_md(dev_t dev);
390 void dm_get(struct mapped_device *md);
391 int dm_hold(struct mapped_device *md);
392 void dm_put(struct mapped_device *md);
393 
394 /*
395  * An arbitrary pointer may be stored alongside a mapped device.
396  */
397 void dm_set_mdptr(struct mapped_device *md, void *ptr);
398 void *dm_get_mdptr(struct mapped_device *md);
399 
400 /*
401  * A device can still be used while suspended, but I/O is deferred.
402  */
403 int dm_suspend(struct mapped_device *md, unsigned suspend_flags);
404 int dm_resume(struct mapped_device *md);
405 
406 /*
407  * Event functions.
408  */
409 uint32_t dm_get_event_nr(struct mapped_device *md);
410 int dm_wait_event(struct mapped_device *md, int event_nr);
411 uint32_t dm_next_uevent_seq(struct mapped_device *md);
412 void dm_uevent_add(struct mapped_device *md, struct list_head *elist);
413 
414 /*
415  * Info functions.
416  */
417 const char *dm_device_name(struct mapped_device *md);
418 int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
419 struct gendisk *dm_disk(struct mapped_device *md);
420 int dm_suspended(struct dm_target *ti);
421 int dm_noflush_suspending(struct dm_target *ti);
422 void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors);
423 void dm_remap_zone_report(struct dm_target *ti, struct bio *bio,
424                           sector_t start);
425 union map_info *dm_get_rq_mapinfo(struct request *rq);
426 
427 struct queue_limits *dm_get_queue_limits(struct mapped_device *md);
428 
429 /*
430  * Geometry functions.
431  */
432 int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
433 int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
434 
435 /*-----------------------------------------------------------------
436  * Functions for manipulating device-mapper tables.
437  *---------------------------------------------------------------*/
438 
439 /*
440  * First create an empty table.
441  */
442 int dm_table_create(struct dm_table **result, fmode_t mode,
443                     unsigned num_targets, struct mapped_device *md);
444 
445 /*
446  * Then call this once for each target.
447  */
448 int dm_table_add_target(struct dm_table *t, const char *type,
449                         sector_t start, sector_t len, char *params);
450 
451 /*
452  * Target_ctr should call this if it needs to add any callbacks.
453  */
454 void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb);
455 
456 /*
457  * Target can use this to set the table's type.
458  * Can only ever be called from a target's ctr.
459  * Useful for "hybrid" target (supports both bio-based
460  * and request-based).
461  */
462 void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type);
463 
464 /*
465  * Finally call this to make the table ready for use.
466  */
467 int dm_table_complete(struct dm_table *t);
468 
469 /*
470  * Destroy the table when finished.
471  */
472 void dm_table_destroy(struct dm_table *t);
473 
474 /*
475  * Target may require that it is never sent I/O larger than len.
476  */
477 int __must_check dm_set_target_max_io_len(struct dm_target *ti, sector_t len);
478 
479 /*
480  * Table reference counting.
481  */
482 struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx);
483 void dm_put_live_table(struct mapped_device *md, int srcu_idx);
484 void dm_sync_table(struct mapped_device *md);
485 
486 /*
487  * Queries
488  */
489 sector_t dm_table_get_size(struct dm_table *t);
490 unsigned int dm_table_get_num_targets(struct dm_table *t);
491 fmode_t dm_table_get_mode(struct dm_table *t);
492 struct mapped_device *dm_table_get_md(struct dm_table *t);
493 
494 /*
495  * Trigger an event.
496  */
497 void dm_table_event(struct dm_table *t);
498 
499 /*
500  * Run the queue for request-based targets.
501  */
502 void dm_table_run_md_queue_async(struct dm_table *t);
503 
504 /*
505  * The device must be suspended before calling this method.
506  * Returns the previous table, which the caller must destroy.
507  */
508 struct dm_table *dm_swap_table(struct mapped_device *md,
509                                struct dm_table *t);
510 
511 /*
512  * A wrapper around vmalloc.
513  */
514 void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
515 
516 /*-----------------------------------------------------------------
517  * Macros.
518  *---------------------------------------------------------------*/
519 #define DM_NAME "device-mapper"
520 
521 #define DM_RATELIMIT(pr_func, fmt, ...)                                 \
522 do {                                                                    \
523         static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,   \
524                                       DEFAULT_RATELIMIT_BURST);         \
525                                                                         \
526         if (__ratelimit(&rs))                                           \
527                 pr_func(DM_FMT(fmt), ##__VA_ARGS__);                    \
528 } while (0)
529 
530 #define DM_FMT(fmt) DM_NAME ": " DM_MSG_PREFIX ": " fmt "\n"
531 
532 #define DMCRIT(fmt, ...) pr_crit(DM_FMT(fmt), ##__VA_ARGS__)
533 
534 #define DMERR(fmt, ...) pr_err(DM_FMT(fmt), ##__VA_ARGS__)
535 #define DMERR_LIMIT(fmt, ...) DM_RATELIMIT(pr_err, fmt, ##__VA_ARGS__)
536 #define DMWARN(fmt, ...) pr_warn(DM_FMT(fmt), ##__VA_ARGS__)
537 #define DMWARN_LIMIT(fmt, ...) DM_RATELIMIT(pr_warn, fmt, ##__VA_ARGS__)
538 #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
539 #define DMINFO_LIMIT(fmt, ...) DM_RATELIMIT(pr_info, fmt, ##__VA_ARGS__)
540 
541 #ifdef CONFIG_DM_DEBUG
542 #define DMDEBUG(fmt, ...) printk(KERN_DEBUG DM_FMT(fmt), ##__VA_ARGS__)
543 #define DMDEBUG_LIMIT(fmt, ...) DM_RATELIMIT(pr_debug, fmt, ##__VA_ARGS__)
544 #else
545 #define DMDEBUG(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
546 #define DMDEBUG_LIMIT(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
547 #endif
548 
549 #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
550                           0 : scnprintf(result + sz, maxlen - sz, x))
551 
552 /*
553  * Definitions of return values from target end_io function.
554  */
555 #define DM_ENDIO_DONE           0
556 #define DM_ENDIO_INCOMPLETE     1
557 #define DM_ENDIO_REQUEUE        2
558 #define DM_ENDIO_DELAY_REQUEUE  3
559 
560 /*
561  * Definitions of return values from target map function.
562  */
563 #define DM_MAPIO_SUBMITTED      0
564 #define DM_MAPIO_REMAPPED       1
565 #define DM_MAPIO_REQUEUE        DM_ENDIO_REQUEUE
566 #define DM_MAPIO_DELAY_REQUEUE  DM_ENDIO_DELAY_REQUEUE
567 #define DM_MAPIO_KILL           4
568 
569 #define dm_sector_div64(x, y)( \
570 { \
571         u64 _res; \
572         (x) = div64_u64_rem(x, y, &_res); \
573         _res; \
574 } \
575 )
576 
577 /*
578  * Ceiling(n / sz)
579  */
580 #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
581 
582 #define dm_sector_div_up(n, sz) ( \
583 { \
584         sector_t _r = ((n) + (sz) - 1); \
585         sector_div(_r, (sz)); \
586         _r; \
587 } \
588 )
589 
590 /*
591  * ceiling(n / size) * size
592  */
593 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
594 
595 #define dm_array_too_big(fixed, obj, num) \
596         ((num) > (UINT_MAX - (fixed)) / (obj))
597 
598 /*
599  * Sector offset taken relative to the start of the target instead of
600  * relative to the start of the device.
601  */
602 #define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
603 
604 static inline sector_t to_sector(unsigned long n)
605 {
606         return (n >> SECTOR_SHIFT);
607 }
608 
609 static inline unsigned long to_bytes(sector_t n)
610 {
611         return (n << SECTOR_SHIFT);
612 }
613 
614 #endif  /* _LINUX_DEVICE_MAPPER_H */
615 

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