Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Sistina Software (UK) Limited. | |
0da336e5 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the LGPL. | |
6 | */ | |
7 | ||
8 | #ifndef _LINUX_DEVICE_MAPPER_H | |
9 | #define _LINUX_DEVICE_MAPPER_H | |
10 | ||
416cd17b | 11 | #include <linux/bio.h> |
f6fccb12 | 12 | #include <linux/blkdev.h> |
71a16736 | 13 | #include <linux/ratelimit.h> |
416cd17b | 14 | |
af4874e0 | 15 | struct dm_dev; |
1da177e4 LT |
16 | struct dm_target; |
17 | struct dm_table; | |
17b2f66f | 18 | struct mapped_device; |
f6fccb12 | 19 | struct bio_vec; |
1da177e4 LT |
20 | |
21 | typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; | |
22 | ||
23 | union map_info { | |
24 | void *ptr; | |
25 | unsigned long long ll; | |
26 | }; | |
27 | ||
28 | /* | |
29 | * In the constructor the target parameter will already have the | |
30 | * table, type, begin and len fields filled in. | |
31 | */ | |
32 | typedef int (*dm_ctr_fn) (struct dm_target *target, | |
33 | unsigned int argc, char **argv); | |
34 | ||
35 | /* | |
36 | * The destructor doesn't need to free the dm_target, just | |
37 | * anything hidden ti->private. | |
38 | */ | |
39 | typedef void (*dm_dtr_fn) (struct dm_target *ti); | |
40 | ||
41 | /* | |
42 | * The map function must return: | |
43 | * < 0: error | |
44 | * = 0: The target will handle the io by resubmitting it later | |
45cbcd79 | 45 | * = 1: simple remap complete |
2e93ccc1 | 46 | * = 2: The target wants to push back the io |
1da177e4 | 47 | */ |
7de3ee57 | 48 | typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); |
7d76345d KU |
49 | typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone, |
50 | union map_info *map_context); | |
1da177e4 LT |
51 | |
52 | /* | |
53 | * Returns: | |
54 | * < 0 : error (currently ignored) | |
55 | * 0 : ended successfully | |
56 | * 1 : for some reason the io has still not completed (eg, | |
57 | * multipath target might want to requeue a failed io). | |
2e93ccc1 | 58 | * 2 : The target wants to push back the io |
1da177e4 LT |
59 | */ |
60 | typedef int (*dm_endio_fn) (struct dm_target *ti, | |
7de3ee57 | 61 | struct bio *bio, int error); |
7d76345d KU |
62 | typedef int (*dm_request_endio_fn) (struct dm_target *ti, |
63 | struct request *clone, int error, | |
64 | union map_info *map_context); | |
1da177e4 LT |
65 | |
66 | typedef void (*dm_presuspend_fn) (struct dm_target *ti); | |
67 | typedef void (*dm_postsuspend_fn) (struct dm_target *ti); | |
8757b776 | 68 | typedef int (*dm_preresume_fn) (struct dm_target *ti); |
1da177e4 LT |
69 | typedef void (*dm_resume_fn) (struct dm_target *ti); |
70 | ||
fd7c092e MP |
71 | typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, |
72 | unsigned status_flags, char *result, unsigned maxlen); | |
1da177e4 LT |
73 | |
74 | typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv); | |
75 | ||
647b3d00 | 76 | typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd, |
aa129a22 MB |
77 | unsigned long arg); |
78 | ||
f6fccb12 MB |
79 | typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm, |
80 | struct bio_vec *biovec, int max_size); | |
81 | ||
058ce5ca AK |
82 | /* |
83 | * These iteration functions are typically used to check (and combine) | |
84 | * properties of underlying devices. | |
85 | * E.g. Does at least one underlying device support flush? | |
86 | * Does any underlying device not support WRITE_SAME? | |
87 | * | |
88 | * The callout function is called once for each contiguous section of | |
89 | * an underlying device. State can be maintained in *data. | |
90 | * Return non-zero to stop iterating through any further devices. | |
91 | */ | |
af4874e0 MS |
92 | typedef int (*iterate_devices_callout_fn) (struct dm_target *ti, |
93 | struct dm_dev *dev, | |
5dea271b | 94 | sector_t start, sector_t len, |
af4874e0 MS |
95 | void *data); |
96 | ||
058ce5ca AK |
97 | /* |
98 | * This function must iterate through each section of device used by the | |
99 | * target until it encounters a non-zero return code, which it then returns. | |
100 | * Returns zero if no callout returned non-zero. | |
101 | */ | |
af4874e0 MS |
102 | typedef int (*dm_iterate_devices_fn) (struct dm_target *ti, |
103 | iterate_devices_callout_fn fn, | |
104 | void *data); | |
105 | ||
40bea431 MS |
106 | typedef void (*dm_io_hints_fn) (struct dm_target *ti, |
107 | struct queue_limits *limits); | |
108 | ||
7d76345d KU |
109 | /* |
110 | * Returns: | |
111 | * 0: The target can handle the next I/O immediately. | |
112 | * 1: The target can't handle the next I/O immediately. | |
113 | */ | |
114 | typedef int (*dm_busy_fn) (struct dm_target *ti); | |
115 | ||
1da177e4 LT |
116 | void dm_error(const char *message); |
117 | ||
3cb40214 BR |
118 | /* |
119 | * Combine device limits. | |
120 | */ | |
754c5fc7 | 121 | int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
5dea271b | 122 | sector_t start, sector_t len, void *data); |
3cb40214 | 123 | |
82b1519b MP |
124 | struct dm_dev { |
125 | struct block_device *bdev; | |
aeb5d727 | 126 | fmode_t mode; |
82b1519b MP |
127 | char name[16]; |
128 | }; | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * Constructors should call these functions to ensure destination devices | |
132 | * are opened/closed correctly. | |
1da177e4 | 133 | */ |
8215d6ec NK |
134 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
135 | struct dm_dev **result); | |
1da177e4 LT |
136 | void dm_put_device(struct dm_target *ti, struct dm_dev *d); |
137 | ||
138 | /* | |
139 | * Information about a target type | |
140 | */ | |
ab4c1424 | 141 | |
1da177e4 | 142 | struct target_type { |
ab4c1424 | 143 | uint64_t features; |
1da177e4 LT |
144 | const char *name; |
145 | struct module *module; | |
17b2f66f | 146 | unsigned version[3]; |
1da177e4 LT |
147 | dm_ctr_fn ctr; |
148 | dm_dtr_fn dtr; | |
149 | dm_map_fn map; | |
7d76345d | 150 | dm_map_request_fn map_rq; |
1da177e4 | 151 | dm_endio_fn end_io; |
7d76345d | 152 | dm_request_endio_fn rq_end_io; |
1da177e4 LT |
153 | dm_presuspend_fn presuspend; |
154 | dm_postsuspend_fn postsuspend; | |
8757b776 | 155 | dm_preresume_fn preresume; |
1da177e4 LT |
156 | dm_resume_fn resume; |
157 | dm_status_fn status; | |
158 | dm_message_fn message; | |
aa129a22 | 159 | dm_ioctl_fn ioctl; |
f6fccb12 | 160 | dm_merge_fn merge; |
7d76345d | 161 | dm_busy_fn busy; |
af4874e0 | 162 | dm_iterate_devices_fn iterate_devices; |
40bea431 | 163 | dm_io_hints_fn io_hints; |
45194e4f CR |
164 | |
165 | /* For internal device-mapper use. */ | |
166 | struct list_head list; | |
1da177e4 LT |
167 | }; |
168 | ||
3791e2fc AK |
169 | /* |
170 | * Target features | |
171 | */ | |
172 | ||
173 | /* | |
174 | * Any table that contains an instance of this target must have only one. | |
175 | */ | |
176 | #define DM_TARGET_SINGLETON 0x00000001 | |
177 | #define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON) | |
178 | ||
cc6cbe14 AK |
179 | /* |
180 | * Indicates that a target does not support read-only devices. | |
181 | */ | |
182 | #define DM_TARGET_ALWAYS_WRITEABLE 0x00000002 | |
183 | #define dm_target_always_writeable(type) \ | |
184 | ((type)->features & DM_TARGET_ALWAYS_WRITEABLE) | |
185 | ||
36a0456f AK |
186 | /* |
187 | * Any device that contains a table with an instance of this target may never | |
188 | * have tables containing any different target type. | |
189 | */ | |
190 | #define DM_TARGET_IMMUTABLE 0x00000004 | |
191 | #define dm_target_is_immutable(type) ((type)->features & DM_TARGET_IMMUTABLE) | |
192 | ||
b0d8ed4d AK |
193 | /* |
194 | * Some targets need to be sent the same WRITE bio severals times so | |
195 | * that they can send copies of it to different devices. This function | |
196 | * examines any supplied bio and returns the number of copies of it the | |
197 | * target requires. | |
198 | */ | |
199 | typedef unsigned (*dm_num_write_bios_fn) (struct dm_target *ti, struct bio *bio); | |
200 | ||
1da177e4 LT |
201 | struct dm_target { |
202 | struct dm_table *table; | |
203 | struct target_type *type; | |
204 | ||
205 | /* target limits */ | |
206 | sector_t begin; | |
207 | sector_t len; | |
208 | ||
542f9038 MS |
209 | /* If non-zero, maximum size of I/O submitted to a target. */ |
210 | uint32_t max_io_len; | |
1da177e4 | 211 | |
f9ab94ce | 212 | /* |
55a62eef | 213 | * A number of zero-length barrier bios that will be submitted |
f9ab94ce MP |
214 | * to the target for the purpose of flushing cache. |
215 | * | |
55a62eef AK |
216 | * The bio number can be accessed with dm_bio_get_target_bio_nr. |
217 | * It is a responsibility of the target driver to remap these bios | |
f9ab94ce MP |
218 | * to the real underlying devices. |
219 | */ | |
55a62eef | 220 | unsigned num_flush_bios; |
f9ab94ce | 221 | |
5ae89a87 | 222 | /* |
55a62eef AK |
223 | * The number of discard bios that will be submitted to the target. |
224 | * The bio number can be accessed with dm_bio_get_target_bio_nr. | |
5ae89a87 | 225 | */ |
55a62eef | 226 | unsigned num_discard_bios; |
5ae89a87 | 227 | |
d54eaa5a | 228 | /* |
55a62eef AK |
229 | * The number of WRITE SAME bios that will be submitted to the target. |
230 | * The bio number can be accessed with dm_bio_get_target_bio_nr. | |
d54eaa5a | 231 | */ |
55a62eef | 232 | unsigned num_write_same_bios; |
d54eaa5a | 233 | |
c0820cf5 MP |
234 | /* |
235 | * The minimum number of extra bytes allocated in each bio for the | |
236 | * target to use. dm_per_bio_data returns the data location. | |
237 | */ | |
238 | unsigned per_bio_data_size; | |
239 | ||
b0d8ed4d AK |
240 | /* |
241 | * If defined, this function is called to find out how many | |
242 | * duplicate bios should be sent to the target when writing | |
243 | * data. | |
244 | */ | |
245 | dm_num_write_bios_fn num_write_bios; | |
246 | ||
1da177e4 LT |
247 | /* target specific data */ |
248 | void *private; | |
249 | ||
250 | /* Used to provide an error string from the ctr */ | |
251 | char *error; | |
4c259327 | 252 | |
0e9c24ed JT |
253 | /* |
254 | * Set if this target needs to receive flushes regardless of | |
255 | * whether or not its underlying devices have support. | |
256 | */ | |
257 | bool flush_supported:1; | |
258 | ||
4c259327 MS |
259 | /* |
260 | * Set if this target needs to receive discards regardless of | |
261 | * whether or not its underlying devices have support. | |
262 | */ | |
0ac55489 | 263 | bool discards_supported:1; |
983c7db3 | 264 | |
7acf0277 | 265 | /* |
55a62eef | 266 | * Set if the target required discard bios to be split |
7acf0277 MP |
267 | * on max_io_len boundary. |
268 | */ | |
55a62eef | 269 | bool split_discard_bios:1; |
7acf0277 | 270 | |
983c7db3 MB |
271 | /* |
272 | * Set if this target does not return zeroes on discarded blocks. | |
273 | */ | |
0ac55489 | 274 | bool discard_zeroes_data_unsupported:1; |
1da177e4 LT |
275 | }; |
276 | ||
9d357b07 N |
277 | /* Each target can link one of these into the table */ |
278 | struct dm_target_callbacks { | |
279 | struct list_head list; | |
280 | int (*congested_fn) (struct dm_target_callbacks *, int); | |
281 | }; | |
282 | ||
c0820cf5 MP |
283 | /* |
284 | * For bio-based dm. | |
285 | * One of these is allocated for each bio. | |
286 | * This structure shouldn't be touched directly by target drivers. | |
287 | * It is here so that we can inline dm_per_bio_data and | |
288 | * dm_bio_from_per_bio_data | |
289 | */ | |
290 | struct dm_target_io { | |
291 | struct dm_io *io; | |
292 | struct dm_target *ti; | |
293 | union map_info info; | |
55a62eef | 294 | unsigned target_bio_nr; |
c0820cf5 MP |
295 | struct bio clone; |
296 | }; | |
297 | ||
298 | static inline void *dm_per_bio_data(struct bio *bio, size_t data_size) | |
299 | { | |
300 | return (char *)bio - offsetof(struct dm_target_io, clone) - data_size; | |
301 | } | |
302 | ||
303 | static inline struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) | |
304 | { | |
305 | return (struct bio *)((char *)data + data_size + offsetof(struct dm_target_io, clone)); | |
306 | } | |
307 | ||
55a62eef | 308 | static inline unsigned dm_bio_get_target_bio_nr(const struct bio *bio) |
ddbd658f | 309 | { |
55a62eef | 310 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; |
ddbd658f MP |
311 | } |
312 | ||
1da177e4 | 313 | int dm_register_target(struct target_type *t); |
10d3bd09 | 314 | void dm_unregister_target(struct target_type *t); |
17b2f66f | 315 | |
498f0103 MS |
316 | /* |
317 | * Target argument parsing. | |
318 | */ | |
319 | struct dm_arg_set { | |
320 | unsigned argc; | |
321 | char **argv; | |
322 | }; | |
323 | ||
324 | /* | |
325 | * The minimum and maximum value of a numeric argument, together with | |
326 | * the error message to use if the number is found to be outside that range. | |
327 | */ | |
328 | struct dm_arg { | |
329 | unsigned min; | |
330 | unsigned max; | |
331 | char *error; | |
332 | }; | |
333 | ||
334 | /* | |
335 | * Validate the next argument, either returning it as *value or, if invalid, | |
336 | * returning -EINVAL and setting *error. | |
337 | */ | |
338 | int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, | |
339 | unsigned *value, char **error); | |
340 | ||
341 | /* | |
342 | * Process the next argument as the start of a group containing between | |
343 | * arg->min and arg->max further arguments. Either return the size as | |
344 | * *num_args or, if invalid, return -EINVAL and set *error. | |
345 | */ | |
346 | int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set, | |
347 | unsigned *num_args, char **error); | |
348 | ||
349 | /* | |
350 | * Return the current argument and shift to the next. | |
351 | */ | |
352 | const char *dm_shift_arg(struct dm_arg_set *as); | |
353 | ||
354 | /* | |
355 | * Move through num_args arguments. | |
356 | */ | |
357 | void dm_consume_args(struct dm_arg_set *as, unsigned num_args); | |
358 | ||
17b2f66f AK |
359 | /*----------------------------------------------------------------- |
360 | * Functions for creating and manipulating mapped devices. | |
361 | * Drop the reference with dm_put when you finish with the object. | |
362 | *---------------------------------------------------------------*/ | |
363 | ||
364 | /* | |
365 | * DM_ANY_MINOR chooses the next available minor number. | |
366 | */ | |
367 | #define DM_ANY_MINOR (-1) | |
368 | int dm_create(int minor, struct mapped_device **md); | |
369 | ||
370 | /* | |
371 | * Reference counting for md. | |
372 | */ | |
373 | struct mapped_device *dm_get_md(dev_t dev); | |
374 | void dm_get(struct mapped_device *md); | |
375 | void dm_put(struct mapped_device *md); | |
376 | ||
377 | /* | |
378 | * An arbitrary pointer may be stored alongside a mapped device. | |
379 | */ | |
380 | void dm_set_mdptr(struct mapped_device *md, void *ptr); | |
381 | void *dm_get_mdptr(struct mapped_device *md); | |
382 | ||
383 | /* | |
384 | * A device can still be used while suspended, but I/O is deferred. | |
385 | */ | |
a3d77d35 | 386 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags); |
17b2f66f AK |
387 | int dm_resume(struct mapped_device *md); |
388 | ||
389 | /* | |
390 | * Event functions. | |
391 | */ | |
392 | uint32_t dm_get_event_nr(struct mapped_device *md); | |
393 | int dm_wait_event(struct mapped_device *md, int event_nr); | |
7a8c3d3b MA |
394 | uint32_t dm_next_uevent_seq(struct mapped_device *md); |
395 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist); | |
17b2f66f AK |
396 | |
397 | /* | |
398 | * Info functions. | |
399 | */ | |
72d94861 | 400 | const char *dm_device_name(struct mapped_device *md); |
96a1f7db | 401 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid); |
17b2f66f | 402 | struct gendisk *dm_disk(struct mapped_device *md); |
64dbce58 | 403 | int dm_suspended(struct dm_target *ti); |
2e93ccc1 | 404 | int dm_noflush_suspending(struct dm_target *ti); |
89343da0 | 405 | union map_info *dm_get_mapinfo(struct bio *bio); |
cec47e3d | 406 | union map_info *dm_get_rq_mapinfo(struct request *rq); |
17b2f66f AK |
407 | |
408 | /* | |
409 | * Geometry functions. | |
410 | */ | |
411 | int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo); | |
412 | int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo); | |
413 | ||
414 | ||
415 | /*----------------------------------------------------------------- | |
416 | * Functions for manipulating device-mapper tables. | |
417 | *---------------------------------------------------------------*/ | |
418 | ||
419 | /* | |
420 | * First create an empty table. | |
421 | */ | |
aeb5d727 | 422 | int dm_table_create(struct dm_table **result, fmode_t mode, |
17b2f66f AK |
423 | unsigned num_targets, struct mapped_device *md); |
424 | ||
425 | /* | |
426 | * Then call this once for each target. | |
427 | */ | |
428 | int dm_table_add_target(struct dm_table *t, const char *type, | |
429 | sector_t start, sector_t len, char *params); | |
430 | ||
9d357b07 N |
431 | /* |
432 | * Target_ctr should call this if it needs to add any callbacks. | |
433 | */ | |
434 | void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb); | |
435 | ||
17b2f66f AK |
436 | /* |
437 | * Finally call this to make the table ready for use. | |
438 | */ | |
439 | int dm_table_complete(struct dm_table *t); | |
440 | ||
542f9038 MS |
441 | /* |
442 | * Target may require that it is never sent I/O larger than len. | |
443 | */ | |
444 | int __must_check dm_set_target_max_io_len(struct dm_target *ti, sector_t len); | |
445 | ||
17b2f66f AK |
446 | /* |
447 | * Table reference counting. | |
448 | */ | |
83d5e5b0 MP |
449 | struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx); |
450 | void dm_put_live_table(struct mapped_device *md, int srcu_idx); | |
451 | void dm_sync_table(struct mapped_device *md); | |
17b2f66f AK |
452 | |
453 | /* | |
454 | * Queries | |
455 | */ | |
456 | sector_t dm_table_get_size(struct dm_table *t); | |
457 | unsigned int dm_table_get_num_targets(struct dm_table *t); | |
aeb5d727 | 458 | fmode_t dm_table_get_mode(struct dm_table *t); |
17b2f66f AK |
459 | struct mapped_device *dm_table_get_md(struct dm_table *t); |
460 | ||
461 | /* | |
462 | * Trigger an event. | |
463 | */ | |
464 | void dm_table_event(struct dm_table *t); | |
465 | ||
466 | /* | |
467 | * The device must be suspended before calling this method. | |
042d2a9b | 468 | * Returns the previous table, which the caller must destroy. |
17b2f66f | 469 | */ |
042d2a9b AK |
470 | struct dm_table *dm_swap_table(struct mapped_device *md, |
471 | struct dm_table *t); | |
17b2f66f | 472 | |
54160904 MP |
473 | /* |
474 | * A wrapper around vmalloc. | |
475 | */ | |
476 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); | |
477 | ||
0da336e5 AK |
478 | /*----------------------------------------------------------------- |
479 | * Macros. | |
480 | *---------------------------------------------------------------*/ | |
481 | #define DM_NAME "device-mapper" | |
482 | ||
71a16736 NK |
483 | #ifdef CONFIG_PRINTK |
484 | extern struct ratelimit_state dm_ratelimit_state; | |
485 | ||
486 | #define dm_ratelimit() __ratelimit(&dm_ratelimit_state) | |
487 | #else | |
488 | #define dm_ratelimit() 0 | |
489 | #endif | |
490 | ||
10d3bd09 MP |
491 | #define DMCRIT(f, arg...) \ |
492 | printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) | |
493 | ||
0da336e5 AK |
494 | #define DMERR(f, arg...) \ |
495 | printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) | |
496 | #define DMERR_LIMIT(f, arg...) \ | |
497 | do { \ | |
71a16736 | 498 | if (dm_ratelimit()) \ |
0da336e5 AK |
499 | printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \ |
500 | f "\n", ## arg); \ | |
501 | } while (0) | |
502 | ||
503 | #define DMWARN(f, arg...) \ | |
504 | printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) | |
505 | #define DMWARN_LIMIT(f, arg...) \ | |
506 | do { \ | |
71a16736 | 507 | if (dm_ratelimit()) \ |
0da336e5 AK |
508 | printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \ |
509 | f "\n", ## arg); \ | |
510 | } while (0) | |
511 | ||
512 | #define DMINFO(f, arg...) \ | |
513 | printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) | |
514 | #define DMINFO_LIMIT(f, arg...) \ | |
515 | do { \ | |
71a16736 | 516 | if (dm_ratelimit()) \ |
0da336e5 AK |
517 | printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \ |
518 | "\n", ## arg); \ | |
519 | } while (0) | |
520 | ||
521 | #ifdef CONFIG_DM_DEBUG | |
522 | # define DMDEBUG(f, arg...) \ | |
523 | printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg) | |
524 | # define DMDEBUG_LIMIT(f, arg...) \ | |
525 | do { \ | |
71a16736 | 526 | if (dm_ratelimit()) \ |
0da336e5 AK |
527 | printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \ |
528 | "\n", ## arg); \ | |
529 | } while (0) | |
530 | #else | |
531 | # define DMDEBUG(f, arg...) do {} while (0) | |
532 | # define DMDEBUG_LIMIT(f, arg...) do {} while (0) | |
533 | #endif | |
534 | ||
535 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ | |
536 | 0 : scnprintf(result + sz, maxlen - sz, x)) | |
537 | ||
538 | #define SECTOR_SHIFT 9 | |
539 | ||
540 | /* | |
541 | * Definitions of return values from target end_io function. | |
542 | */ | |
543 | #define DM_ENDIO_INCOMPLETE 1 | |
544 | #define DM_ENDIO_REQUEUE 2 | |
545 | ||
546 | /* | |
547 | * Definitions of return values from target map function. | |
548 | */ | |
549 | #define DM_MAPIO_SUBMITTED 0 | |
550 | #define DM_MAPIO_REMAPPED 1 | |
551 | #define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE | |
552 | ||
553 | /* | |
554 | * Ceiling(n / sz) | |
555 | */ | |
556 | #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) | |
557 | ||
558 | #define dm_sector_div_up(n, sz) ( \ | |
559 | { \ | |
560 | sector_t _r = ((n) + (sz) - 1); \ | |
561 | sector_div(_r, (sz)); \ | |
562 | _r; \ | |
563 | } \ | |
564 | ) | |
565 | ||
566 | /* | |
567 | * ceiling(n / size) * size | |
568 | */ | |
569 | #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) | |
570 | ||
d63a5ce3 MP |
571 | #define dm_array_too_big(fixed, obj, num) \ |
572 | ((num) > (UINT_MAX - (fixed)) / (obj)) | |
573 | ||
56a67df7 MS |
574 | /* |
575 | * Sector offset taken relative to the start of the target instead of | |
576 | * relative to the start of the device. | |
577 | */ | |
578 | #define dm_target_offset(ti, sector) ((sector) - (ti)->begin) | |
579 | ||
0da336e5 AK |
580 | static inline sector_t to_sector(unsigned long n) |
581 | { | |
582 | return (n >> SECTOR_SHIFT); | |
583 | } | |
584 | ||
585 | static inline unsigned long to_bytes(sector_t n) | |
586 | { | |
587 | return (n << SECTOR_SHIFT); | |
588 | } | |
589 | ||
cec47e3d KU |
590 | /*----------------------------------------------------------------- |
591 | * Helper for block layer and dm core operations | |
592 | *---------------------------------------------------------------*/ | |
593 | void dm_dispatch_request(struct request *rq); | |
594 | void dm_requeue_unmapped_request(struct request *rq); | |
595 | void dm_kill_unmapped_request(struct request *rq, int error); | |
596 | int dm_underlying_device_busy(struct request_queue *q); | |
597 | ||
17b2f66f | 598 | #endif /* _LINUX_DEVICE_MAPPER_H */ |