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FS-Cache: Add netfs registration
[net-next-2.6.git] / fs / fscache / internal.h
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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
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
0e04d4ce
DH		 30/*
31 * fsc-cache.c
32 */
33extern struct list_head fscache_cache_list;
34extern struct rw_semaphore fscache_addremove_sem;
35
36extern struct fscache_cache *fscache_select_cache_for_object(
37 struct fscache_cookie *);
38
955d0091
DH		 39/*
40 * fsc-cookie.c
41 */
42extern struct kmem_cache *fscache_cookie_jar;
43
44extern void fscache_cookie_init_once(void *);
45extern void __fscache_cookie_put(struct fscache_cookie *);
46
a6891645
DH		 47/*
48 * fsc-fsdef.c
49 */
50extern struct fscache_cookie fscache_fsdef_index;
51extern struct fscache_cookie_def fscache_fsdef_netfs_def;
52
7394daa8
DH		 53/*
54 * fsc-histogram.c
55 */
56#ifdef CONFIG_FSCACHE_HISTOGRAM
57extern atomic_t fscache_obj_instantiate_histogram[HZ];
58extern atomic_t fscache_objs_histogram[HZ];
59extern atomic_t fscache_ops_histogram[HZ];
60extern atomic_t fscache_retrieval_delay_histogram[HZ];
61extern atomic_t fscache_retrieval_histogram[HZ];
62
63static 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
71extern const struct file_operations fscache_histogram_fops;
72
73#else
74#define fscache_hist(hist, start_jif) do {} while (0)
75#endif
76
06b3db1b
DH		 77/*
78 * fsc-main.c
79 */
80extern unsigned fscache_defer_lookup;
81extern unsigned fscache_defer_create;
82extern unsigned fscache_debug;
83extern struct kobject *fscache_root;
84
7394daa8
DH		 85/*
86 * fsc-proc.c
87 */
88#ifdef CONFIG_PROC_FS
89extern int __init fscache_proc_init(void);
90extern void fscache_proc_cleanup(void);
91#else
92#define fscache_proc_init() (0)
93#define fscache_proc_cleanup() do {} while (0)
94#endif
95
96/*
97 * fsc-stats.c
98 */
99#ifdef CONFIG_FSCACHE_STATS
100extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
101extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
102
103extern atomic_t fscache_n_op_pend;
104extern atomic_t fscache_n_op_run;
105extern atomic_t fscache_n_op_enqueue;
106extern atomic_t fscache_n_op_deferred_release;
107extern atomic_t fscache_n_op_release;
108extern atomic_t fscache_n_op_gc;
109
110extern atomic_t fscache_n_attr_changed;
111extern atomic_t fscache_n_attr_changed_ok;
112extern atomic_t fscache_n_attr_changed_nobufs;
113extern atomic_t fscache_n_attr_changed_nomem;
114extern atomic_t fscache_n_attr_changed_calls;
115
116extern atomic_t fscache_n_allocs;
117extern atomic_t fscache_n_allocs_ok;
118extern atomic_t fscache_n_allocs_wait;
119extern atomic_t fscache_n_allocs_nobufs;
120extern atomic_t fscache_n_alloc_ops;
121extern atomic_t fscache_n_alloc_op_waits;
122
123extern atomic_t fscache_n_retrievals;
124extern atomic_t fscache_n_retrievals_ok;
125extern atomic_t fscache_n_retrievals_wait;
126extern atomic_t fscache_n_retrievals_nodata;
127extern atomic_t fscache_n_retrievals_nobufs;
128extern atomic_t fscache_n_retrievals_intr;
129extern atomic_t fscache_n_retrievals_nomem;
130extern atomic_t fscache_n_retrieval_ops;
131extern atomic_t fscache_n_retrieval_op_waits;
132
133extern atomic_t fscache_n_stores;
134extern atomic_t fscache_n_stores_ok;
135extern atomic_t fscache_n_stores_again;
136extern atomic_t fscache_n_stores_nobufs;
137extern atomic_t fscache_n_stores_oom;
138extern atomic_t fscache_n_store_ops;
139extern atomic_t fscache_n_store_calls;
140
141extern atomic_t fscache_n_marks;
142extern atomic_t fscache_n_uncaches;
143
144extern atomic_t fscache_n_acquires;
145extern atomic_t fscache_n_acquires_null;
146extern atomic_t fscache_n_acquires_no_cache;
147extern atomic_t fscache_n_acquires_ok;
148extern atomic_t fscache_n_acquires_nobufs;
149extern atomic_t fscache_n_acquires_oom;
150
151extern atomic_t fscache_n_updates;
152extern atomic_t fscache_n_updates_null;
153extern atomic_t fscache_n_updates_run;
154
155extern atomic_t fscache_n_relinquishes;
156extern atomic_t fscache_n_relinquishes_null;
157extern atomic_t fscache_n_relinquishes_waitcrt;
158
159extern atomic_t fscache_n_cookie_index;
160extern atomic_t fscache_n_cookie_data;
161extern atomic_t fscache_n_cookie_special;
162
163extern atomic_t fscache_n_object_alloc;
164extern atomic_t fscache_n_object_no_alloc;
165extern atomic_t fscache_n_object_lookups;
166extern atomic_t fscache_n_object_lookups_negative;
167extern atomic_t fscache_n_object_lookups_positive;
168extern atomic_t fscache_n_object_created;
169extern atomic_t fscache_n_object_avail;
170extern atomic_t fscache_n_object_dead;
171
172extern atomic_t fscache_n_checkaux_none;
173extern atomic_t fscache_n_checkaux_okay;
174extern atomic_t fscache_n_checkaux_update;
175extern atomic_t fscache_n_checkaux_obsolete;
176
177static inline void fscache_stat(atomic_t *stat)
178{
179 atomic_inc(stat);
180}
181
182extern const struct file_operations fscache_stats_fops;
183#else
184
185#define fscache_stat(stat) do {} while (0)
186#endif
187
0e04d4ce
DH		 188/*
189 * raise an event on an object
190 * - if the event is not masked for that object, then the object is
191 * queued for attention by the thread pool.
192 */
193static inline void fscache_raise_event(struct fscache_object *object,
194 unsigned event)
195{
196 BUG(); // TODO
197}
198
06b3db1b
DH		 199/*****************************************************************************/
200/*
201 * debug tracing
202 */
203#define dbgprintk(FMT, ...) \
204 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
205
206/* make sure we maintain the format strings, even when debugging is disabled */
207static inline __attribute__((format(printf, 1, 2)))
208void _dbprintk(const char *fmt, ...)
209{
210}
211
212#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
213#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
214#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
215
216#define kjournal(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
217
218#ifdef __KDEBUG
219#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
220#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
221#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
222
223#elif defined(CONFIG_FSCACHE_DEBUG)
224#define _enter(FMT, ...) \
225do { \
226 if (__do_kdebug(ENTER)) \
227 kenter(FMT, ##__VA_ARGS__); \
228} while (0)
229
230#define _leave(FMT, ...) \
231do { \
232 if (__do_kdebug(LEAVE)) \
233 kleave(FMT, ##__VA_ARGS__); \
234} while (0)
235
236#define _debug(FMT, ...) \
237do { \
238 if (__do_kdebug(DEBUG)) \
239 kdebug(FMT, ##__VA_ARGS__); \
240} while (0)
241
242#else
243#define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
244#define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
245#define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
246#endif
247
248/*
249 * determine whether a particular optional debugging point should be logged
250 * - we need to go through three steps to persuade cpp to correctly join the
251 * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
252 */
253#define ____do_kdebug(LEVEL, POINT) \
254 unlikely((fscache_debug & \
255 (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
256#define ___do_kdebug(LEVEL, POINT) \
257 ____do_kdebug(LEVEL, POINT)
258#define __do_kdebug(POINT) \
259 ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
260
261#define FSCACHE_DEBUG_CACHE 0
262#define FSCACHE_DEBUG_COOKIE 1
263#define FSCACHE_DEBUG_PAGE 2
264#define FSCACHE_DEBUG_OPERATION 3
265
266#define FSCACHE_POINT_ENTER 1
267#define FSCACHE_POINT_LEAVE 2
268#define FSCACHE_POINT_DEBUG 4
269
270#ifndef FSCACHE_DEBUG_LEVEL
271#define FSCACHE_DEBUG_LEVEL CACHE
272#endif
273
274/*
275 * assertions
276 */
277#if 1 /* defined(__KDEBUGALL) */
278
279#define ASSERT(X) \
280do { \
281 if (unlikely(!(X))) { \
282 printk(KERN_ERR "\n"); \
283 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
284 BUG(); \
285 } \
286} while (0)
287
288#define ASSERTCMP(X, OP, Y) \
289do { \
290 if (unlikely(!((X) OP (Y)))) { \
291 printk(KERN_ERR "\n"); \
292 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
293 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
294 (unsigned long)(X), (unsigned long)(Y)); \
295 BUG(); \
296 } \
297} while (0)
298
299#define ASSERTIF(C, X) \
300do { \
301 if (unlikely((C) && !(X))) { \
302 printk(KERN_ERR "\n"); \
303 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
304 BUG(); \
305 } \
306} while (0)
307
308#define ASSERTIFCMP(C, X, OP, Y) \
309do { \
310 if (unlikely((C) && !((X) OP (Y)))) { \
311 printk(KERN_ERR "\n"); \
312 printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
313 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
314 (unsigned long)(X), (unsigned long)(Y)); \
315 BUG(); \
316 } \
317} while (0)
318
319#else
320
321#define ASSERT(X) do {} while (0)
322#define ASSERTCMP(X, OP, Y) do {} while (0)
323#define ASSERTIF(C, X) do {} while (0)
324#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
325
326#endif /* assert or not */
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