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> |
fd2ed4d2 | 13 | #include <linux/math64.h> |
71a16736 | 14 | #include <linux/ratelimit.h> |
416cd17b | 15 | |
af4874e0 | 16 | struct dm_dev; |
1da177e4 LT |
17 | struct dm_target; |
18 | struct dm_table; | |
17b2f66f | 19 | struct mapped_device; |
f6fccb12 | 20 | struct bio_vec; |
1da177e4 LT |
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 | |
45cbcd79 | 46 | * = 1: simple remap complete |
2e93ccc1 | 47 | * = 2: The target wants to push back the io |
1da177e4 | 48 | */ |
7de3ee57 | 49 | typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); |
7d76345d KU |
50 | typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone, |
51 | union map_info *map_context); | |
1da177e4 LT |
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). | |
2e93ccc1 | 59 | * 2 : The target wants to push back the io |
1da177e4 LT |
60 | */ |
61 | typedef int (*dm_endio_fn) (struct dm_target *ti, | |
7de3ee57 | 62 | struct bio *bio, int error); |
7d76345d KU |
63 | typedef int (*dm_request_endio_fn) (struct dm_target *ti, |
64 | struct request *clone, int error, | |
65 | union map_info *map_context); | |
1da177e4 LT |
66 | |
67 | typedef void (*dm_presuspend_fn) (struct dm_target *ti); | |
68 | typedef void (*dm_postsuspend_fn) (struct dm_target *ti); | |
8757b776 | 69 | typedef int (*dm_preresume_fn) (struct dm_target *ti); |
1da177e4 LT |
70 | typedef void (*dm_resume_fn) (struct dm_target *ti); |
71 | ||
fd7c092e MP |
72 | typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, |
73 | unsigned status_flags, char *result, unsigned maxlen); | |
1da177e4 LT |
74 | |
75 | typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv); | |
76 | ||
647b3d00 | 77 | typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd, |
aa129a22 MB |
78 | unsigned long arg); |
79 | ||
f6fccb12 MB |
80 | typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm, |
81 | struct bio_vec *biovec, int max_size); | |
82 | ||
058ce5ca AK |
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 | */ | |
af4874e0 MS |
93 | typedef int (*iterate_devices_callout_fn) (struct dm_target *ti, |
94 | struct dm_dev *dev, | |
5dea271b | 95 | sector_t start, sector_t len, |
af4874e0 MS |
96 | void *data); |
97 | ||
058ce5ca AK |
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 | */ | |
af4874e0 MS |
103 | typedef int (*dm_iterate_devices_fn) (struct dm_target *ti, |
104 | iterate_devices_callout_fn fn, | |
105 | void *data); | |
106 | ||
40bea431 MS |
107 | typedef void (*dm_io_hints_fn) (struct dm_target *ti, |
108 | struct queue_limits *limits); | |
109 | ||
7d76345d KU |
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 | ||
1da177e4 LT |
117 | void dm_error(const char *message); |
118 | ||
3cb40214 BR |
119 | /* |
120 | * Combine device limits. | |
121 | */ | |
754c5fc7 | 122 | int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
5dea271b | 123 | sector_t start, sector_t len, void *data); |
3cb40214 | 124 | |
82b1519b MP |
125 | struct dm_dev { |
126 | struct block_device *bdev; | |
aeb5d727 | 127 | fmode_t mode; |
82b1519b MP |
128 | char name[16]; |
129 | }; | |
130 | ||
1da177e4 LT |
131 | /* |
132 | * Constructors should call these functions to ensure destination devices | |
133 | * are opened/closed correctly. | |
1da177e4 | 134 | */ |
8215d6ec NK |
135 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
136 | struct dm_dev **result); | |
1da177e4 LT |
137 | void dm_put_device(struct dm_target *ti, struct dm_dev *d); |
138 | ||
139 | /* | |
140 | * Information about a target type | |
141 | */ | |
ab4c1424 | 142 | |
1da177e4 | 143 | struct target_type { |
ab4c1424 | 144 | uint64_t features; |
1da177e4 LT |
145 | const char *name; |
146 | struct module *module; | |
17b2f66f | 147 | unsigned version[3]; |
1da177e4 LT |
148 | dm_ctr_fn ctr; |
149 | dm_dtr_fn dtr; | |
150 | dm_map_fn map; | |
7d76345d | 151 | dm_map_request_fn map_rq; |
1da177e4 | 152 | dm_endio_fn end_io; |
7d76345d | 153 | dm_request_endio_fn rq_end_io; |
1da177e4 LT |
154 | dm_presuspend_fn presuspend; |
155 | dm_postsuspend_fn postsuspend; | |
8757b776 | 156 | dm_preresume_fn preresume; |
1da177e4 LT |
157 | dm_resume_fn resume; |
158 | dm_status_fn status; | |
159 | dm_message_fn message; | |
aa129a22 | 160 | dm_ioctl_fn ioctl; |
f6fccb12 | 161 | dm_merge_fn merge; |
7d76345d | 162 | dm_busy_fn busy; |
af4874e0 | 163 | dm_iterate_devices_fn iterate_devices; |
40bea431 | 164 | dm_io_hints_fn io_hints; |
45194e4f CR |
165 | |
166 | /* For internal device-mapper use. */ | |
167 | struct list_head list; | |
1da177e4 LT |
168 | }; |
169 | ||
3791e2fc AK |
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 | ||
cc6cbe14 AK |
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 | ||
36a0456f AK |
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 | ||
b0d8ed4d AK |
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 | ||
1da177e4 LT |
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 | ||
542f9038 MS |
210 | /* If non-zero, maximum size of I/O submitted to a target. */ |
211 | uint32_t max_io_len; | |
1da177e4 | 212 | |
f9ab94ce | 213 | /* |
55a62eef | 214 | * A number of zero-length barrier bios that will be submitted |
f9ab94ce MP |
215 | * to the target for the purpose of flushing cache. |
216 | * | |
55a62eef AK |
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 | |
f9ab94ce MP |
219 | * to the real underlying devices. |
220 | */ | |
55a62eef | 221 | unsigned num_flush_bios; |
f9ab94ce | 222 | |
5ae89a87 | 223 | /* |
55a62eef AK |
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. | |
5ae89a87 | 226 | */ |
55a62eef | 227 | unsigned num_discard_bios; |
5ae89a87 | 228 | |
d54eaa5a | 229 | /* |
55a62eef AK |
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. | |
d54eaa5a | 232 | */ |
55a62eef | 233 | unsigned num_write_same_bios; |
d54eaa5a | 234 | |
c0820cf5 MP |
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 | ||
b0d8ed4d AK |
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 | ||
1da177e4 LT |
248 | /* target specific data */ |
249 | void *private; | |
250 | ||
251 | /* Used to provide an error string from the ctr */ | |
252 | char *error; | |
4c259327 | 253 | |
0e9c24ed JT |
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 | ||
4c259327 MS |
260 | /* |
261 | * Set if this target needs to receive discards regardless of | |
262 | * whether or not its underlying devices have support. | |
263 | */ | |
0ac55489 | 264 | bool discards_supported:1; |
983c7db3 | 265 | |
7acf0277 | 266 | /* |
55a62eef | 267 | * Set if the target required discard bios to be split |
7acf0277 MP |
268 | * on max_io_len boundary. |
269 | */ | |
55a62eef | 270 | bool split_discard_bios:1; |
7acf0277 | 271 | |
983c7db3 MB |
272 | /* |
273 | * Set if this target does not return zeroes on discarded blocks. | |
274 | */ | |
0ac55489 | 275 | bool discard_zeroes_data_unsupported:1; |
1da177e4 LT |
276 | }; |
277 | ||
9d357b07 N |
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 | ||
c0820cf5 MP |
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; | |
55a62eef | 295 | unsigned target_bio_nr; |
c0820cf5 MP |
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 | ||
55a62eef | 309 | static inline unsigned dm_bio_get_target_bio_nr(const struct bio *bio) |
ddbd658f | 310 | { |
55a62eef | 311 | return container_of(bio, struct dm_target_io, clone)->target_bio_nr; |
ddbd658f MP |
312 | } |
313 | ||
1da177e4 | 314 | int dm_register_target(struct target_type *t); |
10d3bd09 | 315 | void dm_unregister_target(struct target_type *t); |
17b2f66f | 316 | |
498f0103 MS |
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 | ||
17b2f66f AK |
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 | */ | |
a3d77d35 | 387 | int dm_suspend(struct mapped_device *md, unsigned suspend_flags); |
17b2f66f AK |
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); | |
7a8c3d3b MA |
395 | uint32_t dm_next_uevent_seq(struct mapped_device *md); |
396 | void dm_uevent_add(struct mapped_device *md, struct list_head *elist); | |
17b2f66f AK |
397 | |
398 | /* | |
399 | * Info functions. | |
400 | */ | |
72d94861 | 401 | const char *dm_device_name(struct mapped_device *md); |
96a1f7db | 402 | int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid); |
17b2f66f | 403 | struct gendisk *dm_disk(struct mapped_device *md); |
64dbce58 | 404 | int dm_suspended(struct dm_target *ti); |
2e93ccc1 | 405 | int dm_noflush_suspending(struct dm_target *ti); |
89343da0 | 406 | union map_info *dm_get_mapinfo(struct bio *bio); |
cec47e3d | 407 | union map_info *dm_get_rq_mapinfo(struct request *rq); |
17b2f66f | 408 | |
f84cb8a4 MS |
409 | struct queue_limits *dm_get_queue_limits(struct mapped_device *md); |
410 | ||
17b2f66f AK |
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 | ||
17b2f66f AK |
417 | /*----------------------------------------------------------------- |
418 | * Functions for manipulating device-mapper tables. | |
419 | *---------------------------------------------------------------*/ | |
420 | ||
421 | /* | |
422 | * First create an empty table. | |
423 | */ | |
aeb5d727 | 424 | int dm_table_create(struct dm_table **result, fmode_t mode, |
17b2f66f AK |
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 | ||
9d357b07 N |
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 | ||
17b2f66f AK |
438 | /* |
439 | * Finally call this to make the table ready for use. | |
440 | */ | |
441 | int dm_table_complete(struct dm_table *t); | |
442 | ||
542f9038 MS |
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 | ||
17b2f66f AK |
448 | /* |
449 | * Table reference counting. | |
450 | */ | |
83d5e5b0 MP |
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); | |
17b2f66f AK |
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); | |
aeb5d727 | 460 | fmode_t dm_table_get_mode(struct dm_table *t); |
17b2f66f AK |
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. | |
042d2a9b | 470 | * Returns the previous table, which the caller must destroy. |
17b2f66f | 471 | */ |
042d2a9b AK |
472 | struct dm_table *dm_swap_table(struct mapped_device *md, |
473 | struct dm_table *t); | |
17b2f66f | 474 | |
54160904 MP |
475 | /* |
476 | * A wrapper around vmalloc. | |
477 | */ | |
478 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); | |
479 | ||
0da336e5 AK |
480 | /*----------------------------------------------------------------- |
481 | * Macros. | |
482 | *---------------------------------------------------------------*/ | |
483 | #define DM_NAME "device-mapper" | |
484 | ||
71a16736 NK |
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 | ||
10d3bd09 MP |
493 | #define DMCRIT(f, arg...) \ |
494 | printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) | |
495 | ||
0da336e5 AK |
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 { \ | |
71a16736 | 500 | if (dm_ratelimit()) \ |
0da336e5 AK |
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 { \ | |
71a16736 | 509 | if (dm_ratelimit()) \ |
0da336e5 AK |
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 { \ | |
71a16736 | 518 | if (dm_ratelimit()) \ |
0da336e5 AK |
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 { \ | |
71a16736 | 528 | if (dm_ratelimit()) \ |
0da336e5 AK |
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 | ||
fd2ed4d2 MP |
555 | #define dm_sector_div64(x, y)( \ |
556 | { \ | |
557 | u64 _res; \ | |
558 | (x) = div64_u64_rem(x, y, &_res); \ | |
559 | _res; \ | |
560 | } \ | |
561 | ) | |
562 | ||
0da336e5 AK |
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 | ||
d63a5ce3 MP |
581 | #define dm_array_too_big(fixed, obj, num) \ |
582 | ((num) > (UINT_MAX - (fixed)) / (obj)) | |
583 | ||
56a67df7 MS |
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 | ||
0da336e5 AK |
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 | ||
cec47e3d KU |
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 | ||
17b2f66f | 608 | #endif /* _LINUX_DEVICE_MAPPER_H */ |