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06b3db1b DH |
1 | /* Internal definitions for FS-Cache |
2 | * | |
3 | * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Lock order, in the order in which multiple locks should be obtained: | |
14 | * - fscache_addremove_sem | |
15 | * - cookie->lock | |
16 | * - cookie->parent->lock | |
17 | * - cache->object_list_lock | |
18 | * - object->lock | |
19 | * - object->parent->lock | |
1bccf513 | 20 | * - cookie->stores_lock |
06b3db1b DH |
21 | * - fscache_thread_lock |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/fscache-cache.h> | |
26 | #include <linux/sched.h> | |
27 | ||
28 | #define FSCACHE_MIN_THREADS 4 | |
29 | #define FSCACHE_MAX_THREADS 32 | |
30 | ||
0e04d4ce | 31 | /* |
348ca102 | 32 | * cache.c |
0e04d4ce DH |
33 | */ |
34 | extern struct list_head fscache_cache_list; | |
35 | extern struct rw_semaphore fscache_addremove_sem; | |
36 | ||
37 | extern struct fscache_cache *fscache_select_cache_for_object( | |
38 | struct fscache_cookie *); | |
39 | ||
955d0091 | 40 | /* |
348ca102 | 41 | * cookie.c |
955d0091 DH |
42 | */ |
43 | extern struct kmem_cache *fscache_cookie_jar; | |
44 | ||
45 | extern void fscache_cookie_init_once(void *); | |
46 | extern void __fscache_cookie_put(struct fscache_cookie *); | |
47 | ||
a6891645 | 48 | /* |
348ca102 | 49 | * fsdef.c |
a6891645 DH |
50 | */ |
51 | extern struct fscache_cookie fscache_fsdef_index; | |
52 | extern struct fscache_cookie_def fscache_fsdef_netfs_def; | |
53 | ||
7394daa8 | 54 | /* |
348ca102 | 55 | * histogram.c |
7394daa8 DH |
56 | */ |
57 | #ifdef CONFIG_FSCACHE_HISTOGRAM | |
58 | extern atomic_t fscache_obj_instantiate_histogram[HZ]; | |
59 | extern atomic_t fscache_objs_histogram[HZ]; | |
60 | extern atomic_t fscache_ops_histogram[HZ]; | |
61 | extern atomic_t fscache_retrieval_delay_histogram[HZ]; | |
62 | extern atomic_t fscache_retrieval_histogram[HZ]; | |
63 | ||
64 | static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif) | |
65 | { | |
66 | unsigned long jif = jiffies - start_jif; | |
67 | if (jif >= HZ) | |
68 | jif = HZ - 1; | |
69 | atomic_inc(&histogram[jif]); | |
70 | } | |
71 | ||
72 | extern const struct file_operations fscache_histogram_fops; | |
73 | ||
74 | #else | |
75 | #define fscache_hist(hist, start_jif) do {} while (0) | |
76 | #endif | |
77 | ||
06b3db1b | 78 | /* |
348ca102 | 79 | * main.c |
06b3db1b DH |
80 | */ |
81 | extern unsigned fscache_defer_lookup; | |
82 | extern unsigned fscache_defer_create; | |
83 | extern unsigned fscache_debug; | |
84 | extern struct kobject *fscache_root; | |
8b8edefa | 85 | extern struct workqueue_struct *fscache_object_wq; |
8af7c124 | 86 | extern struct workqueue_struct *fscache_op_wq; |
8b8edefa TH |
87 | DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait); |
88 | ||
89 | static inline bool fscache_object_congested(void) | |
90 | { | |
91 | return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq); | |
92 | } | |
06b3db1b | 93 | |
2868cbea DH |
94 | extern int fscache_wait_bit(void *); |
95 | extern int fscache_wait_bit_interruptible(void *); | |
96 | ||
36c95590 | 97 | /* |
348ca102 | 98 | * object.c |
36c95590 | 99 | */ |
4fbf4291 DH |
100 | extern const char fscache_object_states_short[FSCACHE_OBJECT__NSTATES][5]; |
101 | ||
36c95590 DH |
102 | extern void fscache_withdrawing_object(struct fscache_cache *, |
103 | struct fscache_object *); | |
104 | extern void fscache_enqueue_object(struct fscache_object *); | |
105 | ||
4fbf4291 DH |
106 | /* |
107 | * object-list.c | |
108 | */ | |
109 | #ifdef CONFIG_FSCACHE_OBJECT_LIST | |
110 | extern const struct file_operations fscache_objlist_fops; | |
111 | ||
112 | extern void fscache_objlist_add(struct fscache_object *); | |
113 | #else | |
114 | #define fscache_objlist_add(object) do {} while(0) | |
115 | #endif | |
116 | ||
36c95590 | 117 | /* |
348ca102 | 118 | * operation.c |
36c95590 | 119 | */ |
952efe7b DH |
120 | extern int fscache_submit_exclusive_op(struct fscache_object *, |
121 | struct fscache_operation *); | |
122 | extern int fscache_submit_op(struct fscache_object *, | |
123 | struct fscache_operation *); | |
91c7fbbf DH |
124 | extern int fscache_cancel_op(struct fscache_operation *, |
125 | void (*)(struct fscache_operation *)); | |
ef778e7a | 126 | extern void fscache_cancel_all_ops(struct fscache_object *); |
952efe7b DH |
127 | extern void fscache_abort_object(struct fscache_object *); |
128 | extern void fscache_start_operations(struct fscache_object *); | |
129 | extern void fscache_operation_gc(struct work_struct *); | |
36c95590 | 130 | |
ef778e7a DH |
131 | /* |
132 | * page.c | |
133 | */ | |
134 | extern void fscache_invalidate_writes(struct fscache_cookie *); | |
135 | ||
7394daa8 | 136 | /* |
348ca102 | 137 | * proc.c |
7394daa8 DH |
138 | */ |
139 | #ifdef CONFIG_PROC_FS | |
140 | extern int __init fscache_proc_init(void); | |
141 | extern void fscache_proc_cleanup(void); | |
142 | #else | |
143 | #define fscache_proc_init() (0) | |
144 | #define fscache_proc_cleanup() do {} while (0) | |
145 | #endif | |
146 | ||
147 | /* | |
348ca102 | 148 | * stats.c |
7394daa8 DH |
149 | */ |
150 | #ifdef CONFIG_FSCACHE_STATS | |
151 | extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS]; | |
152 | extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS]; | |
153 | ||
154 | extern atomic_t fscache_n_op_pend; | |
155 | extern atomic_t fscache_n_op_run; | |
156 | extern atomic_t fscache_n_op_enqueue; | |
157 | extern atomic_t fscache_n_op_deferred_release; | |
158 | extern atomic_t fscache_n_op_release; | |
159 | extern atomic_t fscache_n_op_gc; | |
5753c441 | 160 | extern atomic_t fscache_n_op_cancelled; |
e3d4d28b | 161 | extern atomic_t fscache_n_op_rejected; |
7394daa8 DH |
162 | |
163 | extern atomic_t fscache_n_attr_changed; | |
164 | extern atomic_t fscache_n_attr_changed_ok; | |
165 | extern atomic_t fscache_n_attr_changed_nobufs; | |
166 | extern atomic_t fscache_n_attr_changed_nomem; | |
167 | extern atomic_t fscache_n_attr_changed_calls; | |
168 | ||
169 | extern atomic_t fscache_n_allocs; | |
170 | extern atomic_t fscache_n_allocs_ok; | |
171 | extern atomic_t fscache_n_allocs_wait; | |
172 | extern atomic_t fscache_n_allocs_nobufs; | |
5753c441 | 173 | extern atomic_t fscache_n_allocs_intr; |
60d543ca | 174 | extern atomic_t fscache_n_allocs_object_dead; |
7394daa8 DH |
175 | extern atomic_t fscache_n_alloc_ops; |
176 | extern atomic_t fscache_n_alloc_op_waits; | |
177 | ||
178 | extern atomic_t fscache_n_retrievals; | |
179 | extern atomic_t fscache_n_retrievals_ok; | |
180 | extern atomic_t fscache_n_retrievals_wait; | |
181 | extern atomic_t fscache_n_retrievals_nodata; | |
182 | extern atomic_t fscache_n_retrievals_nobufs; | |
183 | extern atomic_t fscache_n_retrievals_intr; | |
184 | extern atomic_t fscache_n_retrievals_nomem; | |
60d543ca | 185 | extern atomic_t fscache_n_retrievals_object_dead; |
7394daa8 DH |
186 | extern atomic_t fscache_n_retrieval_ops; |
187 | extern atomic_t fscache_n_retrieval_op_waits; | |
188 | ||
189 | extern atomic_t fscache_n_stores; | |
190 | extern atomic_t fscache_n_stores_ok; | |
191 | extern atomic_t fscache_n_stores_again; | |
192 | extern atomic_t fscache_n_stores_nobufs; | |
193 | extern atomic_t fscache_n_stores_oom; | |
194 | extern atomic_t fscache_n_store_ops; | |
195 | extern atomic_t fscache_n_store_calls; | |
1bccf513 DH |
196 | extern atomic_t fscache_n_store_pages; |
197 | extern atomic_t fscache_n_store_radix_deletes; | |
198 | extern atomic_t fscache_n_store_pages_over_limit; | |
7394daa8 | 199 | |
201a1542 DH |
200 | extern atomic_t fscache_n_store_vmscan_not_storing; |
201 | extern atomic_t fscache_n_store_vmscan_gone; | |
202 | extern atomic_t fscache_n_store_vmscan_busy; | |
203 | extern atomic_t fscache_n_store_vmscan_cancelled; | |
8c209ce7 | 204 | extern atomic_t fscache_n_store_vmscan_wait; |
201a1542 | 205 | |
7394daa8 DH |
206 | extern atomic_t fscache_n_marks; |
207 | extern atomic_t fscache_n_uncaches; | |
208 | ||
209 | extern atomic_t fscache_n_acquires; | |
210 | extern atomic_t fscache_n_acquires_null; | |
211 | extern atomic_t fscache_n_acquires_no_cache; | |
212 | extern atomic_t fscache_n_acquires_ok; | |
213 | extern atomic_t fscache_n_acquires_nobufs; | |
214 | extern atomic_t fscache_n_acquires_oom; | |
215 | ||
ef778e7a DH |
216 | extern atomic_t fscache_n_invalidates; |
217 | extern atomic_t fscache_n_invalidates_run; | |
218 | ||
7394daa8 DH |
219 | extern atomic_t fscache_n_updates; |
220 | extern atomic_t fscache_n_updates_null; | |
221 | extern atomic_t fscache_n_updates_run; | |
222 | ||
223 | extern atomic_t fscache_n_relinquishes; | |
224 | extern atomic_t fscache_n_relinquishes_null; | |
225 | extern atomic_t fscache_n_relinquishes_waitcrt; | |
2175bb06 | 226 | extern atomic_t fscache_n_relinquishes_retire; |
7394daa8 DH |
227 | |
228 | extern atomic_t fscache_n_cookie_index; | |
229 | extern atomic_t fscache_n_cookie_data; | |
230 | extern atomic_t fscache_n_cookie_special; | |
231 | ||
232 | extern atomic_t fscache_n_object_alloc; | |
233 | extern atomic_t fscache_n_object_no_alloc; | |
234 | extern atomic_t fscache_n_object_lookups; | |
235 | extern atomic_t fscache_n_object_lookups_negative; | |
236 | extern atomic_t fscache_n_object_lookups_positive; | |
fee096de | 237 | extern atomic_t fscache_n_object_lookups_timed_out; |
7394daa8 DH |
238 | extern atomic_t fscache_n_object_created; |
239 | extern atomic_t fscache_n_object_avail; | |
240 | extern atomic_t fscache_n_object_dead; | |
241 | ||
242 | extern atomic_t fscache_n_checkaux_none; | |
243 | extern atomic_t fscache_n_checkaux_okay; | |
244 | extern atomic_t fscache_n_checkaux_update; | |
245 | extern atomic_t fscache_n_checkaux_obsolete; | |
246 | ||
52bd75fd DH |
247 | extern atomic_t fscache_n_cop_alloc_object; |
248 | extern atomic_t fscache_n_cop_lookup_object; | |
249 | extern atomic_t fscache_n_cop_lookup_complete; | |
250 | extern atomic_t fscache_n_cop_grab_object; | |
ef778e7a | 251 | extern atomic_t fscache_n_cop_invalidate_object; |
52bd75fd DH |
252 | extern atomic_t fscache_n_cop_update_object; |
253 | extern atomic_t fscache_n_cop_drop_object; | |
254 | extern atomic_t fscache_n_cop_put_object; | |
255 | extern atomic_t fscache_n_cop_sync_cache; | |
256 | extern atomic_t fscache_n_cop_attr_changed; | |
257 | extern atomic_t fscache_n_cop_read_or_alloc_page; | |
258 | extern atomic_t fscache_n_cop_read_or_alloc_pages; | |
259 | extern atomic_t fscache_n_cop_allocate_page; | |
260 | extern atomic_t fscache_n_cop_allocate_pages; | |
261 | extern atomic_t fscache_n_cop_write_page; | |
262 | extern atomic_t fscache_n_cop_uncache_page; | |
263 | extern atomic_t fscache_n_cop_dissociate_pages; | |
264 | ||
7394daa8 DH |
265 | static inline void fscache_stat(atomic_t *stat) |
266 | { | |
267 | atomic_inc(stat); | |
268 | } | |
269 | ||
52bd75fd DH |
270 | static inline void fscache_stat_d(atomic_t *stat) |
271 | { | |
272 | atomic_dec(stat); | |
273 | } | |
274 | ||
60d543ca DH |
275 | #define __fscache_stat(stat) (stat) |
276 | ||
7394daa8 DH |
277 | extern const struct file_operations fscache_stats_fops; |
278 | #else | |
279 | ||
60d543ca | 280 | #define __fscache_stat(stat) (NULL) |
7394daa8 | 281 | #define fscache_stat(stat) do {} while (0) |
4fa9f4ed | 282 | #define fscache_stat_d(stat) do {} while (0) |
7394daa8 DH |
283 | #endif |
284 | ||
0e04d4ce DH |
285 | /* |
286 | * raise an event on an object | |
287 | * - if the event is not masked for that object, then the object is | |
288 | * queued for attention by the thread pool. | |
289 | */ | |
290 | static inline void fscache_raise_event(struct fscache_object *object, | |
291 | unsigned event) | |
292 | { | |
8d76349d | 293 | BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS); |
36c95590 DH |
294 | if (!test_and_set_bit(event, &object->events) && |
295 | test_bit(event, &object->event_mask)) | |
296 | fscache_enqueue_object(object); | |
297 | } | |
298 | ||
299 | /* | |
300 | * drop a reference to a cookie | |
301 | */ | |
302 | static inline void fscache_cookie_put(struct fscache_cookie *cookie) | |
303 | { | |
304 | BUG_ON(atomic_read(&cookie->usage) <= 0); | |
305 | if (atomic_dec_and_test(&cookie->usage)) | |
306 | __fscache_cookie_put(cookie); | |
0e04d4ce DH |
307 | } |
308 | ||
b5108822 DH |
309 | /* |
310 | * get an extra reference to a netfs retrieval context | |
311 | */ | |
312 | static inline | |
313 | void *fscache_get_context(struct fscache_cookie *cookie, void *context) | |
314 | { | |
315 | if (cookie->def->get_context) | |
316 | cookie->def->get_context(cookie->netfs_data, context); | |
317 | return context; | |
318 | } | |
319 | ||
320 | /* | |
321 | * release a reference to a netfs retrieval context | |
322 | */ | |
323 | static inline | |
324 | void fscache_put_context(struct fscache_cookie *cookie, void *context) | |
325 | { | |
326 | if (cookie->def->put_context) | |
327 | cookie->def->put_context(cookie->netfs_data, context); | |
328 | } | |
329 | ||
06b3db1b DH |
330 | /*****************************************************************************/ |
331 | /* | |
332 | * debug tracing | |
333 | */ | |
334 | #define dbgprintk(FMT, ...) \ | |
335 | printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__) | |
336 | ||
06b3db1b DH |
337 | #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
338 | #define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__) | |
339 | #define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__) | |
340 | ||
12fdff3f | 341 | #define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__) |
06b3db1b DH |
342 | |
343 | #ifdef __KDEBUG | |
344 | #define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__) | |
345 | #define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__) | |
346 | #define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__) | |
347 | ||
348 | #elif defined(CONFIG_FSCACHE_DEBUG) | |
349 | #define _enter(FMT, ...) \ | |
350 | do { \ | |
351 | if (__do_kdebug(ENTER)) \ | |
352 | kenter(FMT, ##__VA_ARGS__); \ | |
353 | } while (0) | |
354 | ||
355 | #define _leave(FMT, ...) \ | |
356 | do { \ | |
357 | if (__do_kdebug(LEAVE)) \ | |
358 | kleave(FMT, ##__VA_ARGS__); \ | |
359 | } while (0) | |
360 | ||
361 | #define _debug(FMT, ...) \ | |
362 | do { \ | |
363 | if (__do_kdebug(DEBUG)) \ | |
364 | kdebug(FMT, ##__VA_ARGS__); \ | |
365 | } while (0) | |
366 | ||
367 | #else | |
12fdff3f DH |
368 | #define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
369 | #define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__) | |
370 | #define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__) | |
06b3db1b DH |
371 | #endif |
372 | ||
373 | /* | |
374 | * determine whether a particular optional debugging point should be logged | |
375 | * - we need to go through three steps to persuade cpp to correctly join the | |
376 | * shorthand in FSCACHE_DEBUG_LEVEL with its prefix | |
377 | */ | |
378 | #define ____do_kdebug(LEVEL, POINT) \ | |
379 | unlikely((fscache_debug & \ | |
380 | (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3)))) | |
381 | #define ___do_kdebug(LEVEL, POINT) \ | |
382 | ____do_kdebug(LEVEL, POINT) | |
383 | #define __do_kdebug(POINT) \ | |
384 | ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT) | |
385 | ||
386 | #define FSCACHE_DEBUG_CACHE 0 | |
387 | #define FSCACHE_DEBUG_COOKIE 1 | |
388 | #define FSCACHE_DEBUG_PAGE 2 | |
389 | #define FSCACHE_DEBUG_OPERATION 3 | |
390 | ||
391 | #define FSCACHE_POINT_ENTER 1 | |
392 | #define FSCACHE_POINT_LEAVE 2 | |
393 | #define FSCACHE_POINT_DEBUG 4 | |
394 | ||
395 | #ifndef FSCACHE_DEBUG_LEVEL | |
396 | #define FSCACHE_DEBUG_LEVEL CACHE | |
397 | #endif | |
398 | ||
399 | /* | |
400 | * assertions | |
401 | */ | |
402 | #if 1 /* defined(__KDEBUGALL) */ | |
403 | ||
404 | #define ASSERT(X) \ | |
405 | do { \ | |
406 | if (unlikely(!(X))) { \ | |
407 | printk(KERN_ERR "\n"); \ | |
408 | printk(KERN_ERR "FS-Cache: Assertion failed\n"); \ | |
409 | BUG(); \ | |
410 | } \ | |
411 | } while (0) | |
412 | ||
413 | #define ASSERTCMP(X, OP, Y) \ | |
414 | do { \ | |
415 | if (unlikely(!((X) OP (Y)))) { \ | |
416 | printk(KERN_ERR "\n"); \ | |
417 | printk(KERN_ERR "FS-Cache: Assertion failed\n"); \ | |
418 | printk(KERN_ERR "%lx " #OP " %lx is false\n", \ | |
419 | (unsigned long)(X), (unsigned long)(Y)); \ | |
420 | BUG(); \ | |
421 | } \ | |
422 | } while (0) | |
423 | ||
424 | #define ASSERTIF(C, X) \ | |
425 | do { \ | |
426 | if (unlikely((C) && !(X))) { \ | |
427 | printk(KERN_ERR "\n"); \ | |
428 | printk(KERN_ERR "FS-Cache: Assertion failed\n"); \ | |
429 | BUG(); \ | |
430 | } \ | |
431 | } while (0) | |
432 | ||
433 | #define ASSERTIFCMP(C, X, OP, Y) \ | |
434 | do { \ | |
435 | if (unlikely((C) && !((X) OP (Y)))) { \ | |
436 | printk(KERN_ERR "\n"); \ | |
437 | printk(KERN_ERR "FS-Cache: Assertion failed\n"); \ | |
438 | printk(KERN_ERR "%lx " #OP " %lx is false\n", \ | |
439 | (unsigned long)(X), (unsigned long)(Y)); \ | |
440 | BUG(); \ | |
441 | } \ | |
442 | } while (0) | |
443 | ||
444 | #else | |
445 | ||
446 | #define ASSERT(X) do {} while (0) | |
447 | #define ASSERTCMP(X, OP, Y) do {} while (0) | |
448 | #define ASSERTIF(C, X) do {} while (0) | |
449 | #define ASSERTIFCMP(C, X, OP, Y) do {} while (0) | |
450 | ||
451 | #endif /* assert or not */ |