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
20 * - fscache_thread_lock
21 *
22 */
23
24 #include <linux/fscache-cache.h>
25 #include <linux/sched.h>
26
27 #define FSCACHE_MIN_THREADS 4
28 #define FSCACHE_MAX_THREADS 32
29
30 /*
31 * cache.c
32 */
33 extern struct list_head fscache_cache_list;
34 extern struct rw_semaphore fscache_addremove_sem;
35
36 extern struct fscache_cache *fscache_select_cache_for_object(
37 struct fscache_cookie *);
38
39 /*
40 * cookie.c
41 */
42 extern struct kmem_cache *fscache_cookie_jar;
43
44 extern void fscache_cookie_init_once(void *);
45 extern void __fscache_cookie_put(struct fscache_cookie *);
46
47 /*
48 * fsdef.c
49 */
50 extern struct fscache_cookie fscache_fsdef_index;
51 extern struct fscache_cookie_def fscache_fsdef_netfs_def;
52
53 /*
54 * histogram.c
55 */
56 #ifdef CONFIG_FSCACHE_HISTOGRAM
57 extern atomic_t fscache_obj_instantiate_histogram[HZ];
58 extern atomic_t fscache_objs_histogram[HZ];
59 extern atomic_t fscache_ops_histogram[HZ];
60 extern atomic_t fscache_retrieval_delay_histogram[HZ];
61 extern atomic_t fscache_retrieval_histogram[HZ];
62
63 static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
64 {
65 unsigned long jif = jiffies - start_jif;
66 if (jif >= HZ)
67 jif = HZ - 1;
68 atomic_inc(&histogram[jif]);
69 }
70
71 extern const struct file_operations fscache_histogram_fops;
72
73 #else
74 #define fscache_hist(hist, start_jif) do {} while (0)
75 #endif
76
77 /*
78 * main.c
79 */
80 extern unsigned fscache_defer_lookup;
81 extern unsigned fscache_defer_create;
82 extern unsigned fscache_debug;
83 extern struct kobject *fscache_root;
84
85 extern int fscache_wait_bit(void *);
86 extern int fscache_wait_bit_interruptible(void *);
87
88 /*
89 * object.c
90 */
91 extern void fscache_withdrawing_object(struct fscache_cache *,
92 struct fscache_object *);
93 extern void fscache_enqueue_object(struct fscache_object *);
94
95 /*
96 * operation.c
97 */
98 extern int fscache_submit_exclusive_op(struct fscache_object *,
99 struct fscache_operation *);
100 extern int fscache_submit_op(struct fscache_object *,
101 struct fscache_operation *);
102 extern void fscache_abort_object(struct fscache_object *);
103 extern void fscache_start_operations(struct fscache_object *);
104 extern void fscache_operation_gc(struct work_struct *);
105
106 /*
107 * proc.c
108 */
109 #ifdef CONFIG_PROC_FS
110 extern int __init fscache_proc_init(void);
111 extern void fscache_proc_cleanup(void);
112 #else
113 #define fscache_proc_init() (0)
114 #define fscache_proc_cleanup() do {} while (0)
115 #endif
116
117 /*
118 * stats.c
119 */
120 #ifdef CONFIG_FSCACHE_STATS
121 extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
122 extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
123
124 extern atomic_t fscache_n_op_pend;
125 extern atomic_t fscache_n_op_run;
126 extern atomic_t fscache_n_op_enqueue;
127 extern atomic_t fscache_n_op_deferred_release;
128 extern atomic_t fscache_n_op_release;
129 extern atomic_t fscache_n_op_gc;
130
131 extern atomic_t fscache_n_attr_changed;
132 extern atomic_t fscache_n_attr_changed_ok;
133 extern atomic_t fscache_n_attr_changed_nobufs;
134 extern atomic_t fscache_n_attr_changed_nomem;
135 extern atomic_t fscache_n_attr_changed_calls;
136
137 extern atomic_t fscache_n_allocs;
138 extern atomic_t fscache_n_allocs_ok;
139 extern atomic_t fscache_n_allocs_wait;
140 extern atomic_t fscache_n_allocs_nobufs;
141 extern atomic_t fscache_n_alloc_ops;
142 extern atomic_t fscache_n_alloc_op_waits;
143
144 extern atomic_t fscache_n_retrievals;
145 extern atomic_t fscache_n_retrievals_ok;
146 extern atomic_t fscache_n_retrievals_wait;
147 extern atomic_t fscache_n_retrievals_nodata;
148 extern atomic_t fscache_n_retrievals_nobufs;
149 extern atomic_t fscache_n_retrievals_intr;
150 extern atomic_t fscache_n_retrievals_nomem;
151 extern atomic_t fscache_n_retrieval_ops;
152 extern atomic_t fscache_n_retrieval_op_waits;
153
154 extern atomic_t fscache_n_stores;
155 extern atomic_t fscache_n_stores_ok;
156 extern atomic_t fscache_n_stores_again;
157 extern atomic_t fscache_n_stores_nobufs;
158 extern atomic_t fscache_n_stores_oom;
159 extern atomic_t fscache_n_store_ops;
160 extern atomic_t fscache_n_store_calls;
161
162 extern atomic_t fscache_n_marks;
163 extern atomic_t fscache_n_uncaches;
164
165 extern atomic_t fscache_n_acquires;
166 extern atomic_t fscache_n_acquires_null;
167 extern atomic_t fscache_n_acquires_no_cache;
168 extern atomic_t fscache_n_acquires_ok;
169 extern atomic_t fscache_n_acquires_nobufs;
170 extern atomic_t fscache_n_acquires_oom;
171
172 extern atomic_t fscache_n_updates;
173 extern atomic_t fscache_n_updates_null;
174 extern atomic_t fscache_n_updates_run;
175
176 extern atomic_t fscache_n_relinquishes;
177 extern atomic_t fscache_n_relinquishes_null;
178 extern atomic_t fscache_n_relinquishes_waitcrt;
179
180 extern atomic_t fscache_n_cookie_index;
181 extern atomic_t fscache_n_cookie_data;
182 extern atomic_t fscache_n_cookie_special;
183
184 extern atomic_t fscache_n_object_alloc;
185 extern atomic_t fscache_n_object_no_alloc;
186 extern atomic_t fscache_n_object_lookups;
187 extern atomic_t fscache_n_object_lookups_negative;
188 extern atomic_t fscache_n_object_lookups_positive;
189 extern atomic_t fscache_n_object_created;
190 extern atomic_t fscache_n_object_avail;
191 extern atomic_t fscache_n_object_dead;
192
193 extern atomic_t fscache_n_checkaux_none;
194 extern atomic_t fscache_n_checkaux_okay;
195 extern atomic_t fscache_n_checkaux_update;
196 extern atomic_t fscache_n_checkaux_obsolete;
197
198 static inline void fscache_stat(atomic_t *stat)
199 {
200 atomic_inc(stat);
201 }
202
203 extern const struct file_operations fscache_stats_fops;
204 #else
205
206 #define fscache_stat(stat) do {} while (0)
207 #endif
208
209 /*
210 * raise an event on an object
211 * - if the event is not masked for that object, then the object is
212 * queued for attention by the thread pool.
213 */
214 static inline void fscache_raise_event(struct fscache_object *object,
215 unsigned event)
216 {
217 if (!test_and_set_bit(event, &object->events) &&
218 test_bit(event, &object->event_mask))
219 fscache_enqueue_object(object);
220 }
221
222 /*
223 * drop a reference to a cookie
224 */
225 static inline void fscache_cookie_put(struct fscache_cookie *cookie)
226 {
227 BUG_ON(atomic_read(&cookie->usage) <= 0);
228 if (atomic_dec_and_test(&cookie->usage))
229 __fscache_cookie_put(cookie);
230 }
231
232 /*
233 * get an extra reference to a netfs retrieval context
234 */
235 static inline
236 void *fscache_get_context(struct fscache_cookie *cookie, void *context)
237 {
238 if (cookie->def->get_context)
239 cookie->def->get_context(cookie->netfs_data, context);
240 return context;
241 }
242
243 /*
244 * release a reference to a netfs retrieval context
245 */
246 static inline
247 void fscache_put_context(struct fscache_cookie *cookie, void *context)
248 {
249 if (cookie->def->put_context)
250 cookie->def->put_context(cookie->netfs_data, context);
251 }
252
253 /*****************************************************************************/
254 /*
255 * debug tracing
256 */
257 #define dbgprintk(FMT, ...) \
258 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
259
260 /* make sure we maintain the format strings, even when debugging is disabled */
261 static inline __attribute__((format(printf, 1, 2)))
262 void _dbprintk(const char *fmt, ...)
263 {
264 }
265
266 #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
267 #define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
268 #define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
269
270 #define kjournal(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
271
272 #ifdef __KDEBUG
273 #define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
274 #define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
275 #define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
276
277 #elif defined(CONFIG_FSCACHE_DEBUG)
278 #define _enter(FMT, ...) \
279 do { \
280 if (__do_kdebug(ENTER)) \
281 kenter(FMT, ##__VA_ARGS__); \
282 } while (0)
283
284 #define _leave(FMT, ...) \
285 do { \
286 if (__do_kdebug(LEAVE)) \
287 kleave(FMT, ##__VA_ARGS__); \
288 } while (0)
289
290 #define _debug(FMT, ...) \
291 do { \
292 if (__do_kdebug(DEBUG)) \
293 kdebug(FMT, ##__VA_ARGS__); \
294 } while (0)
295
296 #else
297 #define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
298 #define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
299 #define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
300 #endif
301
302 /*
303 * determine whether a particular optional debugging point should be logged
304 * - we need to go through three steps to persuade cpp to correctly join the
305 * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
306 */
307 #define ____do_kdebug(LEVEL, POINT) \
308 unlikely((fscache_debug & \
309 (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
310 #define ___do_kdebug(LEVEL, POINT) \
311 ____do_kdebug(LEVEL, POINT)
312 #define __do_kdebug(POINT) \
313 ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
314
315 #define FSCACHE_DEBUG_CACHE 0
316 #define FSCACHE_DEBUG_COOKIE 1
317 #define FSCACHE_DEBUG_PAGE 2
318 #define FSCACHE_DEBUG_OPERATION 3
319
320 #define FSCACHE_POINT_ENTER 1
321 #define FSCACHE_POINT_LEAVE 2
322 #define FSCACHE_POINT_DEBUG 4
323
324 #ifndef FSCACHE_DEBUG_LEVEL
325 #define FSCACHE_DEBUG_LEVEL CACHE
326 #endif
327
328 /*
329 * assertions
330 */
331 #if 1 /* defined(__KDEBUGALL) */
332
333 #define ASSERT(X) \
334 do { \
335 if (unlikely(!(X))) { \
336 printk(KERN_ERR "\n"); \
337 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
338 BUG(); \
339 } \
340 } while (0)
341
342 #define ASSERTCMP(X, OP, Y) \
343 do { \
344 if (unlikely(!((X) OP (Y)))) { \
345 printk(KERN_ERR "\n"); \
346 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
347 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
348 (unsigned long)(X), (unsigned long)(Y)); \
349 BUG(); \
350 } \
351 } while (0)
352
353 #define ASSERTIF(C, X) \
354 do { \
355 if (unlikely((C) && !(X))) { \
356 printk(KERN_ERR "\n"); \
357 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
358 BUG(); \
359 } \
360 } while (0)
361
362 #define ASSERTIFCMP(C, X, OP, Y) \
363 do { \
364 if (unlikely((C) && !((X) OP (Y)))) { \
365 printk(KERN_ERR "\n"); \
366 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
367 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
368 (unsigned long)(X), (unsigned long)(Y)); \
369 BUG(); \
370 } \
371 } while (0)
372
373 #else
374
375 #define ASSERT(X) do {} while (0)
376 #define ASSERTCMP(X, OP, Y) do {} while (0)
377 #define ASSERTIF(C, X) do {} while (0)
378 #define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
379
380 #endif /* assert or not */
381
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