IB/core: Fix uninitialized variable use in check_qp_port_pkey_settings
[linux/fpc-iii.git] / fs / fscache / internal.h
blob97ec4511095765ffa96f98538aedc74cae8fbadf
1 /* Internal definitions for FS-Cache
3 * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
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 * - cookie->stores_lock
21 * - fscache_thread_lock
25 #ifdef pr_fmt
26 #undef pr_fmt
27 #endif
29 #define pr_fmt(fmt) "FS-Cache: " fmt
31 #include <linux/fscache-cache.h>
32 #include <linux/sched.h>
34 #define FSCACHE_MIN_THREADS 4
35 #define FSCACHE_MAX_THREADS 32
38 * cache.c
40 extern struct list_head fscache_cache_list;
41 extern struct rw_semaphore fscache_addremove_sem;
43 extern struct fscache_cache *fscache_select_cache_for_object(
44 struct fscache_cookie *);
47 * cookie.c
49 extern struct kmem_cache *fscache_cookie_jar;
51 extern void fscache_cookie_init_once(void *);
52 extern void __fscache_cookie_put(struct fscache_cookie *);
55 * fsdef.c
57 extern struct fscache_cookie fscache_fsdef_index;
58 extern struct fscache_cookie_def fscache_fsdef_netfs_def;
61 * histogram.c
63 #ifdef CONFIG_FSCACHE_HISTOGRAM
64 extern atomic_t fscache_obj_instantiate_histogram[HZ];
65 extern atomic_t fscache_objs_histogram[HZ];
66 extern atomic_t fscache_ops_histogram[HZ];
67 extern atomic_t fscache_retrieval_delay_histogram[HZ];
68 extern atomic_t fscache_retrieval_histogram[HZ];
70 static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
72 unsigned long jif = jiffies - start_jif;
73 if (jif >= HZ)
74 jif = HZ - 1;
75 atomic_inc(&histogram[jif]);
78 extern const struct file_operations fscache_histogram_fops;
80 #else
81 #define fscache_hist(hist, start_jif) do {} while (0)
82 #endif
85 * main.c
87 extern unsigned fscache_defer_lookup;
88 extern unsigned fscache_defer_create;
89 extern unsigned fscache_debug;
90 extern struct kobject *fscache_root;
91 extern struct workqueue_struct *fscache_object_wq;
92 extern struct workqueue_struct *fscache_op_wq;
93 DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
95 static inline bool fscache_object_congested(void)
97 return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq);
100 extern int fscache_wait_atomic_t(atomic_t *);
103 * object.c
105 extern void fscache_enqueue_object(struct fscache_object *);
108 * object-list.c
110 #ifdef CONFIG_FSCACHE_OBJECT_LIST
111 extern const struct file_operations fscache_objlist_fops;
113 extern void fscache_objlist_add(struct fscache_object *);
114 extern void fscache_objlist_remove(struct fscache_object *);
115 #else
116 #define fscache_objlist_add(object) do {} while(0)
117 #define fscache_objlist_remove(object) do {} while(0)
118 #endif
121 * operation.c
123 extern int fscache_submit_exclusive_op(struct fscache_object *,
124 struct fscache_operation *);
125 extern int fscache_submit_op(struct fscache_object *,
126 struct fscache_operation *);
127 extern int fscache_cancel_op(struct fscache_operation *, bool);
128 extern void fscache_cancel_all_ops(struct fscache_object *);
129 extern void fscache_abort_object(struct fscache_object *);
130 extern void fscache_start_operations(struct fscache_object *);
131 extern void fscache_operation_gc(struct work_struct *);
134 * page.c
136 extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *);
137 extern int fscache_wait_for_operation_activation(struct fscache_object *,
138 struct fscache_operation *,
139 atomic_t *,
140 atomic_t *);
141 extern void fscache_invalidate_writes(struct fscache_cookie *);
144 * proc.c
146 #ifdef CONFIG_PROC_FS
147 extern int __init fscache_proc_init(void);
148 extern void fscache_proc_cleanup(void);
149 #else
150 #define fscache_proc_init() (0)
151 #define fscache_proc_cleanup() do {} while (0)
152 #endif
155 * stats.c
157 #ifdef CONFIG_FSCACHE_STATS
158 extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
159 extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
161 extern atomic_t fscache_n_op_pend;
162 extern atomic_t fscache_n_op_run;
163 extern atomic_t fscache_n_op_enqueue;
164 extern atomic_t fscache_n_op_deferred_release;
165 extern atomic_t fscache_n_op_initialised;
166 extern atomic_t fscache_n_op_release;
167 extern atomic_t fscache_n_op_gc;
168 extern atomic_t fscache_n_op_cancelled;
169 extern atomic_t fscache_n_op_rejected;
171 extern atomic_t fscache_n_attr_changed;
172 extern atomic_t fscache_n_attr_changed_ok;
173 extern atomic_t fscache_n_attr_changed_nobufs;
174 extern atomic_t fscache_n_attr_changed_nomem;
175 extern atomic_t fscache_n_attr_changed_calls;
177 extern atomic_t fscache_n_allocs;
178 extern atomic_t fscache_n_allocs_ok;
179 extern atomic_t fscache_n_allocs_wait;
180 extern atomic_t fscache_n_allocs_nobufs;
181 extern atomic_t fscache_n_allocs_intr;
182 extern atomic_t fscache_n_allocs_object_dead;
183 extern atomic_t fscache_n_alloc_ops;
184 extern atomic_t fscache_n_alloc_op_waits;
186 extern atomic_t fscache_n_retrievals;
187 extern atomic_t fscache_n_retrievals_ok;
188 extern atomic_t fscache_n_retrievals_wait;
189 extern atomic_t fscache_n_retrievals_nodata;
190 extern atomic_t fscache_n_retrievals_nobufs;
191 extern atomic_t fscache_n_retrievals_intr;
192 extern atomic_t fscache_n_retrievals_nomem;
193 extern atomic_t fscache_n_retrievals_object_dead;
194 extern atomic_t fscache_n_retrieval_ops;
195 extern atomic_t fscache_n_retrieval_op_waits;
197 extern atomic_t fscache_n_stores;
198 extern atomic_t fscache_n_stores_ok;
199 extern atomic_t fscache_n_stores_again;
200 extern atomic_t fscache_n_stores_nobufs;
201 extern atomic_t fscache_n_stores_oom;
202 extern atomic_t fscache_n_store_ops;
203 extern atomic_t fscache_n_store_calls;
204 extern atomic_t fscache_n_store_pages;
205 extern atomic_t fscache_n_store_radix_deletes;
206 extern atomic_t fscache_n_store_pages_over_limit;
208 extern atomic_t fscache_n_store_vmscan_not_storing;
209 extern atomic_t fscache_n_store_vmscan_gone;
210 extern atomic_t fscache_n_store_vmscan_busy;
211 extern atomic_t fscache_n_store_vmscan_cancelled;
212 extern atomic_t fscache_n_store_vmscan_wait;
214 extern atomic_t fscache_n_marks;
215 extern atomic_t fscache_n_uncaches;
217 extern atomic_t fscache_n_acquires;
218 extern atomic_t fscache_n_acquires_null;
219 extern atomic_t fscache_n_acquires_no_cache;
220 extern atomic_t fscache_n_acquires_ok;
221 extern atomic_t fscache_n_acquires_nobufs;
222 extern atomic_t fscache_n_acquires_oom;
224 extern atomic_t fscache_n_invalidates;
225 extern atomic_t fscache_n_invalidates_run;
227 extern atomic_t fscache_n_updates;
228 extern atomic_t fscache_n_updates_null;
229 extern atomic_t fscache_n_updates_run;
231 extern atomic_t fscache_n_relinquishes;
232 extern atomic_t fscache_n_relinquishes_null;
233 extern atomic_t fscache_n_relinquishes_waitcrt;
234 extern atomic_t fscache_n_relinquishes_retire;
236 extern atomic_t fscache_n_cookie_index;
237 extern atomic_t fscache_n_cookie_data;
238 extern atomic_t fscache_n_cookie_special;
240 extern atomic_t fscache_n_object_alloc;
241 extern atomic_t fscache_n_object_no_alloc;
242 extern atomic_t fscache_n_object_lookups;
243 extern atomic_t fscache_n_object_lookups_negative;
244 extern atomic_t fscache_n_object_lookups_positive;
245 extern atomic_t fscache_n_object_lookups_timed_out;
246 extern atomic_t fscache_n_object_created;
247 extern atomic_t fscache_n_object_avail;
248 extern atomic_t fscache_n_object_dead;
250 extern atomic_t fscache_n_checkaux_none;
251 extern atomic_t fscache_n_checkaux_okay;
252 extern atomic_t fscache_n_checkaux_update;
253 extern atomic_t fscache_n_checkaux_obsolete;
255 extern atomic_t fscache_n_cop_alloc_object;
256 extern atomic_t fscache_n_cop_lookup_object;
257 extern atomic_t fscache_n_cop_lookup_complete;
258 extern atomic_t fscache_n_cop_grab_object;
259 extern atomic_t fscache_n_cop_invalidate_object;
260 extern atomic_t fscache_n_cop_update_object;
261 extern atomic_t fscache_n_cop_drop_object;
262 extern atomic_t fscache_n_cop_put_object;
263 extern atomic_t fscache_n_cop_sync_cache;
264 extern atomic_t fscache_n_cop_attr_changed;
265 extern atomic_t fscache_n_cop_read_or_alloc_page;
266 extern atomic_t fscache_n_cop_read_or_alloc_pages;
267 extern atomic_t fscache_n_cop_allocate_page;
268 extern atomic_t fscache_n_cop_allocate_pages;
269 extern atomic_t fscache_n_cop_write_page;
270 extern atomic_t fscache_n_cop_uncache_page;
271 extern atomic_t fscache_n_cop_dissociate_pages;
273 extern atomic_t fscache_n_cache_no_space_reject;
274 extern atomic_t fscache_n_cache_stale_objects;
275 extern atomic_t fscache_n_cache_retired_objects;
276 extern atomic_t fscache_n_cache_culled_objects;
278 static inline void fscache_stat(atomic_t *stat)
280 atomic_inc(stat);
283 static inline void fscache_stat_d(atomic_t *stat)
285 atomic_dec(stat);
288 #define __fscache_stat(stat) (stat)
290 extern const struct file_operations fscache_stats_fops;
291 #else
293 #define __fscache_stat(stat) (NULL)
294 #define fscache_stat(stat) do {} while (0)
295 #define fscache_stat_d(stat) do {} while (0)
296 #endif
299 * raise an event on an object
300 * - if the event is not masked for that object, then the object is
301 * queued for attention by the thread pool.
303 static inline void fscache_raise_event(struct fscache_object *object,
304 unsigned event)
306 BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS);
307 #if 0
308 printk("*** fscache_raise_event(OBJ%d{%lx},%x)\n",
309 object->debug_id, object->event_mask, (1 << event));
310 #endif
311 if (!test_and_set_bit(event, &object->events) &&
312 test_bit(event, &object->event_mask))
313 fscache_enqueue_object(object);
317 * drop a reference to a cookie
319 static inline void fscache_cookie_put(struct fscache_cookie *cookie)
321 BUG_ON(atomic_read(&cookie->usage) <= 0);
322 if (atomic_dec_and_test(&cookie->usage))
323 __fscache_cookie_put(cookie);
327 * get an extra reference to a netfs retrieval context
329 static inline
330 void *fscache_get_context(struct fscache_cookie *cookie, void *context)
332 if (cookie->def->get_context)
333 cookie->def->get_context(cookie->netfs_data, context);
334 return context;
338 * release a reference to a netfs retrieval context
340 static inline
341 void fscache_put_context(struct fscache_cookie *cookie, void *context)
343 if (cookie->def->put_context)
344 cookie->def->put_context(cookie->netfs_data, context);
347 /*****************************************************************************/
349 * debug tracing
351 #define dbgprintk(FMT, ...) \
352 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
354 #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
355 #define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
356 #define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
358 #define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
360 #ifdef __KDEBUG
361 #define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
362 #define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
363 #define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
365 #elif defined(CONFIG_FSCACHE_DEBUG)
366 #define _enter(FMT, ...) \
367 do { \
368 if (__do_kdebug(ENTER)) \
369 kenter(FMT, ##__VA_ARGS__); \
370 } while (0)
372 #define _leave(FMT, ...) \
373 do { \
374 if (__do_kdebug(LEAVE)) \
375 kleave(FMT, ##__VA_ARGS__); \
376 } while (0)
378 #define _debug(FMT, ...) \
379 do { \
380 if (__do_kdebug(DEBUG)) \
381 kdebug(FMT, ##__VA_ARGS__); \
382 } while (0)
384 #else
385 #define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
386 #define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
387 #define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
388 #endif
391 * determine whether a particular optional debugging point should be logged
392 * - we need to go through three steps to persuade cpp to correctly join the
393 * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
395 #define ____do_kdebug(LEVEL, POINT) \
396 unlikely((fscache_debug & \
397 (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
398 #define ___do_kdebug(LEVEL, POINT) \
399 ____do_kdebug(LEVEL, POINT)
400 #define __do_kdebug(POINT) \
401 ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
403 #define FSCACHE_DEBUG_CACHE 0
404 #define FSCACHE_DEBUG_COOKIE 1
405 #define FSCACHE_DEBUG_PAGE 2
406 #define FSCACHE_DEBUG_OPERATION 3
408 #define FSCACHE_POINT_ENTER 1
409 #define FSCACHE_POINT_LEAVE 2
410 #define FSCACHE_POINT_DEBUG 4
412 #ifndef FSCACHE_DEBUG_LEVEL
413 #define FSCACHE_DEBUG_LEVEL CACHE
414 #endif
417 * assertions
419 #if 1 /* defined(__KDEBUGALL) */
421 #define ASSERT(X) \
422 do { \
423 if (unlikely(!(X))) { \
424 pr_err("\n"); \
425 pr_err("Assertion failed\n"); \
426 BUG(); \
428 } while (0)
430 #define ASSERTCMP(X, OP, Y) \
431 do { \
432 if (unlikely(!((X) OP (Y)))) { \
433 pr_err("\n"); \
434 pr_err("Assertion failed\n"); \
435 pr_err("%lx " #OP " %lx is false\n", \
436 (unsigned long)(X), (unsigned long)(Y)); \
437 BUG(); \
439 } while (0)
441 #define ASSERTIF(C, X) \
442 do { \
443 if (unlikely((C) && !(X))) { \
444 pr_err("\n"); \
445 pr_err("Assertion failed\n"); \
446 BUG(); \
448 } while (0)
450 #define ASSERTIFCMP(C, X, OP, Y) \
451 do { \
452 if (unlikely((C) && !((X) OP (Y)))) { \
453 pr_err("\n"); \
454 pr_err("Assertion failed\n"); \
455 pr_err("%lx " #OP " %lx is false\n", \
456 (unsigned long)(X), (unsigned long)(Y)); \
457 BUG(); \
459 } while (0)
461 #else
463 #define ASSERT(X) do {} while (0)
464 #define ASSERTCMP(X, OP, Y) do {} while (0)
465 #define ASSERTIF(C, X) do {} while (0)
466 #define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
468 #endif /* assert or not */