[net-next-2.6.git] / fs / fscache / internal.h

/* Internal definitions for FS-Cache
 *
 * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

/*
 * Lock order, in the order in which multiple locks should be obtained:
 * - fscache_addremove_sem
 * - cookie->lock
 * - cookie->parent->lock
 * - cache->object_list_lock
 * - object->lock
 * - object->parent->lock
 * - cookie->stores_lock
 * - fscache_thread_lock
 *
 */

#include <linux/fscache-cache.h>
#include <linux/sched.h>

#define FSCACHE_MIN_THREADS	4
#define FSCACHE_MAX_THREADS	32

/*
 * cache.c
 */
extern struct list_head fscache_cache_list;
extern struct rw_semaphore fscache_addremove_sem;

extern struct fscache_cache *fscache_select_cache_for_object(
	struct fscache_cookie *);

/*
 * cookie.c
 */
extern struct kmem_cache *fscache_cookie_jar;

extern void fscache_cookie_init_once(void *);
extern void __fscache_cookie_put(struct fscache_cookie *);

/*
 * fsdef.c
 */
extern struct fscache_cookie fscache_fsdef_index;
extern struct fscache_cookie_def fscache_fsdef_netfs_def;

/*
 * histogram.c
 */
#ifdef CONFIG_FSCACHE_HISTOGRAM
extern atomic_t fscache_obj_instantiate_histogram[HZ];
extern atomic_t fscache_objs_histogram[HZ];
extern atomic_t fscache_ops_histogram[HZ];
extern atomic_t fscache_retrieval_delay_histogram[HZ];
extern atomic_t fscache_retrieval_histogram[HZ];

static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
{
	unsigned long jif = jiffies - start_jif;
	if (jif >= HZ)
		jif = HZ - 1;
	atomic_inc(&histogram[jif]);
}

extern const struct file_operations fscache_histogram_fops;

#else
#define fscache_hist(hist, start_jif) do {} while (0)
#endif

/*
 * main.c
 */
extern unsigned fscache_defer_lookup;
extern unsigned fscache_defer_create;
extern unsigned fscache_debug;
extern struct kobject *fscache_root;

extern int fscache_wait_bit(void *);
extern int fscache_wait_bit_interruptible(void *);

/*
 * object.c
 */
extern const char fscache_object_states_short[FSCACHE_OBJECT__NSTATES][5];

extern void fscache_withdrawing_object(struct fscache_cache *,
				       struct fscache_object *);
extern void fscache_enqueue_object(struct fscache_object *);

/*
 * object-list.c
 */
#ifdef CONFIG_FSCACHE_OBJECT_LIST
extern const struct file_operations fscache_objlist_fops;

extern void fscache_objlist_add(struct fscache_object *);
#else
#define fscache_objlist_add(object) do {} while(0)
#endif

/*
 * operation.c
 */
extern int fscache_submit_exclusive_op(struct fscache_object *,
				       struct fscache_operation *);
extern int fscache_submit_op(struct fscache_object *,
			     struct fscache_operation *);
extern int fscache_cancel_op(struct fscache_operation *);
extern void fscache_abort_object(struct fscache_object *);
extern void fscache_start_operations(struct fscache_object *);
extern void fscache_operation_gc(struct work_struct *);

/*
 * proc.c
 */
#ifdef CONFIG_PROC_FS
extern int __init fscache_proc_init(void);
extern void fscache_proc_cleanup(void);
#else
#define fscache_proc_init()	(0)
#define fscache_proc_cleanup()	do {} while (0)
#endif

/*
 * stats.c
 */
#ifdef CONFIG_FSCACHE_STATS
extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];

extern atomic_t fscache_n_op_pend;
extern atomic_t fscache_n_op_run;
extern atomic_t fscache_n_op_enqueue;
extern atomic_t fscache_n_op_deferred_release;
extern atomic_t fscache_n_op_release;
extern atomic_t fscache_n_op_gc;
extern atomic_t fscache_n_op_cancelled;
extern atomic_t fscache_n_op_rejected;

extern atomic_t fscache_n_attr_changed;
extern atomic_t fscache_n_attr_changed_ok;
extern atomic_t fscache_n_attr_changed_nobufs;
extern atomic_t fscache_n_attr_changed_nomem;
extern atomic_t fscache_n_attr_changed_calls;

extern atomic_t fscache_n_allocs;
extern atomic_t fscache_n_allocs_ok;
extern atomic_t fscache_n_allocs_wait;
extern atomic_t fscache_n_allocs_nobufs;
extern atomic_t fscache_n_allocs_intr;
extern atomic_t fscache_n_allocs_object_dead;
extern atomic_t fscache_n_alloc_ops;
extern atomic_t fscache_n_alloc_op_waits;

extern atomic_t fscache_n_retrievals;
extern atomic_t fscache_n_retrievals_ok;
extern atomic_t fscache_n_retrievals_wait;
extern atomic_t fscache_n_retrievals_nodata;
extern atomic_t fscache_n_retrievals_nobufs;
extern atomic_t fscache_n_retrievals_intr;
extern atomic_t fscache_n_retrievals_nomem;
extern atomic_t fscache_n_retrievals_object_dead;
extern atomic_t fscache_n_retrieval_ops;
extern atomic_t fscache_n_retrieval_op_waits;

extern atomic_t fscache_n_stores;
extern atomic_t fscache_n_stores_ok;
extern atomic_t fscache_n_stores_again;
extern atomic_t fscache_n_stores_nobufs;
extern atomic_t fscache_n_stores_oom;
extern atomic_t fscache_n_store_ops;
extern atomic_t fscache_n_store_calls;
extern atomic_t fscache_n_store_pages;
extern atomic_t fscache_n_store_radix_deletes;
extern atomic_t fscache_n_store_pages_over_limit;

extern atomic_t fscache_n_store_vmscan_not_storing;
extern atomic_t fscache_n_store_vmscan_gone;
extern atomic_t fscache_n_store_vmscan_busy;
extern atomic_t fscache_n_store_vmscan_cancelled;

extern atomic_t fscache_n_marks;
extern atomic_t fscache_n_uncaches;

extern atomic_t fscache_n_acquires;
extern atomic_t fscache_n_acquires_null;
extern atomic_t fscache_n_acquires_no_cache;
extern atomic_t fscache_n_acquires_ok;
extern atomic_t fscache_n_acquires_nobufs;
extern atomic_t fscache_n_acquires_oom;

extern atomic_t fscache_n_updates;
extern atomic_t fscache_n_updates_null;
extern atomic_t fscache_n_updates_run;

extern atomic_t fscache_n_relinquishes;
extern atomic_t fscache_n_relinquishes_null;
extern atomic_t fscache_n_relinquishes_waitcrt;
extern atomic_t fscache_n_relinquishes_retire;

extern atomic_t fscache_n_cookie_index;
extern atomic_t fscache_n_cookie_data;
extern atomic_t fscache_n_cookie_special;

extern atomic_t fscache_n_object_alloc;
extern atomic_t fscache_n_object_no_alloc;
extern atomic_t fscache_n_object_lookups;
extern atomic_t fscache_n_object_lookups_negative;
extern atomic_t fscache_n_object_lookups_positive;
extern atomic_t fscache_n_object_created;
extern atomic_t fscache_n_object_avail;
extern atomic_t fscache_n_object_dead;

extern atomic_t fscache_n_checkaux_none;
extern atomic_t fscache_n_checkaux_okay;
extern atomic_t fscache_n_checkaux_update;
extern atomic_t fscache_n_checkaux_obsolete;

extern atomic_t fscache_n_cop_alloc_object;
extern atomic_t fscache_n_cop_lookup_object;
extern atomic_t fscache_n_cop_lookup_complete;
extern atomic_t fscache_n_cop_grab_object;
extern atomic_t fscache_n_cop_update_object;
extern atomic_t fscache_n_cop_drop_object;
extern atomic_t fscache_n_cop_put_object;
extern atomic_t fscache_n_cop_sync_cache;
extern atomic_t fscache_n_cop_attr_changed;
extern atomic_t fscache_n_cop_read_or_alloc_page;
extern atomic_t fscache_n_cop_read_or_alloc_pages;
extern atomic_t fscache_n_cop_allocate_page;
extern atomic_t fscache_n_cop_allocate_pages;
extern atomic_t fscache_n_cop_write_page;
extern atomic_t fscache_n_cop_uncache_page;
extern atomic_t fscache_n_cop_dissociate_pages;

static inline void fscache_stat(atomic_t *stat)
{
	atomic_inc(stat);
}

static inline void fscache_stat_d(atomic_t *stat)
{
	atomic_dec(stat);
}

#define __fscache_stat(stat) (stat)

extern const struct file_operations fscache_stats_fops;
#else

#define __fscache_stat(stat) (NULL)
#define fscache_stat(stat) do {} while (0)
#endif

/*
 * raise an event on an object
 * - if the event is not masked for that object, then the object is
 *   queued for attention by the thread pool.
 */
static inline void fscache_raise_event(struct fscache_object *object,
				       unsigned event)
{
	if (!test_and_set_bit(event, &object->events) &&
	    test_bit(event, &object->event_mask))
		fscache_enqueue_object(object);
}

/*
 * drop a reference to a cookie
 */
static inline void fscache_cookie_put(struct fscache_cookie *cookie)
{
	BUG_ON(atomic_read(&cookie->usage) <= 0);
	if (atomic_dec_and_test(&cookie->usage))
		__fscache_cookie_put(cookie);
}

/*
 * get an extra reference to a netfs retrieval context
 */
static inline
void *fscache_get_context(struct fscache_cookie *cookie, void *context)
{
	if (cookie->def->get_context)
		cookie->def->get_context(cookie->netfs_data, context);
	return context;
}

/*
 * release a reference to a netfs retrieval context
 */
static inline
void fscache_put_context(struct fscache_cookie *cookie, void *context)
{
	if (cookie->def->put_context)
		cookie->def->put_context(cookie->netfs_data, context);
}

/*****************************************************************************/
/*
 * debug tracing
 */
#define dbgprintk(FMT, ...) \
	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)

/* make sure we maintain the format strings, even when debugging is disabled */
static inline __attribute__((format(printf, 1, 2)))
void _dbprintk(const char *fmt, ...)
{
}

#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)

#define kjournal(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)

#ifdef __KDEBUG
#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)

#elif defined(CONFIG_FSCACHE_DEBUG)
#define _enter(FMT, ...)			\
do {						\
	if (__do_kdebug(ENTER))			\
		kenter(FMT, ##__VA_ARGS__);	\
} while (0)

#define _leave(FMT, ...)			\
do {						\
	if (__do_kdebug(LEAVE))			\
		kleave(FMT, ##__VA_ARGS__);	\
} while (0)

#define _debug(FMT, ...)			\
do {						\
	if (__do_kdebug(DEBUG))			\
		kdebug(FMT, ##__VA_ARGS__);	\
} while (0)

#else
#define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
#define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
#define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
#endif

/*
 * determine whether a particular optional debugging point should be logged
 * - we need to go through three steps to persuade cpp to correctly join the
 *   shorthand in FSCACHE_DEBUG_LEVEL with its prefix
 */
#define ____do_kdebug(LEVEL, POINT) \
	unlikely((fscache_debug & \
		  (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
#define ___do_kdebug(LEVEL, POINT) \
	____do_kdebug(LEVEL, POINT)
#define __do_kdebug(POINT) \
	___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)

#define FSCACHE_DEBUG_CACHE	0
#define FSCACHE_DEBUG_COOKIE	1
#define FSCACHE_DEBUG_PAGE	2
#define FSCACHE_DEBUG_OPERATION	3

#define FSCACHE_POINT_ENTER	1
#define FSCACHE_POINT_LEAVE	2
#define FSCACHE_POINT_DEBUG	4

#ifndef FSCACHE_DEBUG_LEVEL
#define FSCACHE_DEBUG_LEVEL CACHE
#endif

/*
 * assertions
 */
#if 1 /* defined(__KDEBUGALL) */

#define ASSERT(X)							\
do {									\
	if (unlikely(!(X))) {						\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "FS-Cache: Assertion failed\n");	\
		BUG();							\
	}								\
} while (0)

#define ASSERTCMP(X, OP, Y)						\
do {									\
	if (unlikely(!((X) OP (Y)))) {					\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "FS-Cache: Assertion failed\n");	\
		printk(KERN_ERR "%lx " #OP " %lx is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while (0)

#define ASSERTIF(C, X)							\
do {									\
	if (unlikely((C) && !(X))) {					\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "FS-Cache: Assertion failed\n");	\
		BUG();							\
	}								\
} while (0)

#define ASSERTIFCMP(C, X, OP, Y)					\
do {									\
	if (unlikely((C) && !((X) OP (Y)))) {				\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "FS-Cache: Assertion failed\n");	\
		printk(KERN_ERR "%lx " #OP " %lx is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while (0)

#else

#define ASSERT(X)			do {} while (0)
#define ASSERTCMP(X, OP, Y)		do {} while (0)
#define ASSERTIF(C, X)			do {} while (0)
#define ASSERTIFCMP(C, X, OP, Y)	do {} while (0)

#endif /* assert or not */
Commit	Line	Data
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;
	85
2868cbea DH	86	extern int fscache_wait_bit(void *);
	87	extern int fscache_wait_bit_interruptible(void *);
	88
36c95590	89	/*
348ca102	90	* object.c
36c95590	91	*/
4fbf4291 DH	92	extern const char fscache_object_states_short[FSCACHE_OBJECT__NSTATES][5];
4fbf4291 DH	93
36c95590 DH	94	extern void fscache_withdrawing_object(struct fscache_cache *,
	95	struct fscache_object *);
	96	extern void fscache_enqueue_object(struct fscache_object *);
	97
4fbf4291 DH	98	/*
	99	* object-list.c
	100	*/
	101	#ifdef CONFIG_FSCACHE_OBJECT_LIST
	102	extern const struct file_operations fscache_objlist_fops;
	103
	104	extern void fscache_objlist_add(struct fscache_object *);
	105	#else
	106	#define fscache_objlist_add(object) do {} while(0)
	107	#endif
	108
36c95590	109	/*
348ca102	110	* operation.c
36c95590	111	*/
952efe7b DH	112	extern int fscache_submit_exclusive_op(struct fscache_object *,
	113	struct fscache_operation *);
	114	extern int fscache_submit_op(struct fscache_object *,
	115	struct fscache_operation *);
5753c441	116	extern int fscache_cancel_op(struct fscache_operation *);
952efe7b DH	117	extern void fscache_abort_object(struct fscache_object *);
	118	extern void fscache_start_operations(struct fscache_object *);
	119	extern void fscache_operation_gc(struct work_struct *);
36c95590	120
7394daa8	121	/*
348ca102	122	* proc.c
7394daa8 DH	123	*/
	124	#ifdef CONFIG_PROC_FS
	125	extern int __init fscache_proc_init(void);
	126	extern void fscache_proc_cleanup(void);
	127	#else
	128	#define fscache_proc_init() (0)
	129	#define fscache_proc_cleanup() do {} while (0)
	130	#endif
	131
	132	/*
348ca102	133	* stats.c
7394daa8 DH	134	*/
	135	#ifdef CONFIG_FSCACHE_STATS
	136	extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
	137	extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
	138
	139	extern atomic_t fscache_n_op_pend;
	140	extern atomic_t fscache_n_op_run;
	141	extern atomic_t fscache_n_op_enqueue;
	142	extern atomic_t fscache_n_op_deferred_release;
	143	extern atomic_t fscache_n_op_release;
	144	extern atomic_t fscache_n_op_gc;
5753c441	145	extern atomic_t fscache_n_op_cancelled;
e3d4d28b	146	extern atomic_t fscache_n_op_rejected;
7394daa8 DH	147
	148	extern atomic_t fscache_n_attr_changed;
	149	extern atomic_t fscache_n_attr_changed_ok;
	150	extern atomic_t fscache_n_attr_changed_nobufs;
	151	extern atomic_t fscache_n_attr_changed_nomem;
	152	extern atomic_t fscache_n_attr_changed_calls;
	153
	154	extern atomic_t fscache_n_allocs;
	155	extern atomic_t fscache_n_allocs_ok;
	156	extern atomic_t fscache_n_allocs_wait;
	157	extern atomic_t fscache_n_allocs_nobufs;
5753c441	158	extern atomic_t fscache_n_allocs_intr;
60d543ca	159	extern atomic_t fscache_n_allocs_object_dead;
7394daa8 DH	160	extern atomic_t fscache_n_alloc_ops;
	161	extern atomic_t fscache_n_alloc_op_waits;
	162
	163	extern atomic_t fscache_n_retrievals;
	164	extern atomic_t fscache_n_retrievals_ok;
	165	extern atomic_t fscache_n_retrievals_wait;
	166	extern atomic_t fscache_n_retrievals_nodata;
	167	extern atomic_t fscache_n_retrievals_nobufs;
	168	extern atomic_t fscache_n_retrievals_intr;
	169	extern atomic_t fscache_n_retrievals_nomem;
60d543ca	170	extern atomic_t fscache_n_retrievals_object_dead;
7394daa8 DH	171	extern atomic_t fscache_n_retrieval_ops;
	172	extern atomic_t fscache_n_retrieval_op_waits;
	173
	174	extern atomic_t fscache_n_stores;
	175	extern atomic_t fscache_n_stores_ok;
	176	extern atomic_t fscache_n_stores_again;
	177	extern atomic_t fscache_n_stores_nobufs;
	178	extern atomic_t fscache_n_stores_oom;
	179	extern atomic_t fscache_n_store_ops;
	180	extern atomic_t fscache_n_store_calls;
1bccf513 DH	181	extern atomic_t fscache_n_store_pages;
	182	extern atomic_t fscache_n_store_radix_deletes;
	183	extern atomic_t fscache_n_store_pages_over_limit;
7394daa8	184
201a1542 DH	185	extern atomic_t fscache_n_store_vmscan_not_storing;
	186	extern atomic_t fscache_n_store_vmscan_gone;
	187	extern atomic_t fscache_n_store_vmscan_busy;
	188	extern atomic_t fscache_n_store_vmscan_cancelled;
	189
7394daa8 DH	190	extern atomic_t fscache_n_marks;
	191	extern atomic_t fscache_n_uncaches;
	192
	193	extern atomic_t fscache_n_acquires;
	194	extern atomic_t fscache_n_acquires_null;
	195	extern atomic_t fscache_n_acquires_no_cache;
	196	extern atomic_t fscache_n_acquires_ok;
	197	extern atomic_t fscache_n_acquires_nobufs;
	198	extern atomic_t fscache_n_acquires_oom;
	199
	200	extern atomic_t fscache_n_updates;
	201	extern atomic_t fscache_n_updates_null;
	202	extern atomic_t fscache_n_updates_run;
	203
	204	extern atomic_t fscache_n_relinquishes;
	205	extern atomic_t fscache_n_relinquishes_null;
	206	extern atomic_t fscache_n_relinquishes_waitcrt;
2175bb06	207	extern atomic_t fscache_n_relinquishes_retire;
7394daa8 DH	208
	209	extern atomic_t fscache_n_cookie_index;
	210	extern atomic_t fscache_n_cookie_data;
	211	extern atomic_t fscache_n_cookie_special;
	212
	213	extern atomic_t fscache_n_object_alloc;
	214	extern atomic_t fscache_n_object_no_alloc;
	215	extern atomic_t fscache_n_object_lookups;
	216	extern atomic_t fscache_n_object_lookups_negative;
	217	extern atomic_t fscache_n_object_lookups_positive;
	218	extern atomic_t fscache_n_object_created;
	219	extern atomic_t fscache_n_object_avail;
	220	extern atomic_t fscache_n_object_dead;
	221
	222	extern atomic_t fscache_n_checkaux_none;
	223	extern atomic_t fscache_n_checkaux_okay;
	224	extern atomic_t fscache_n_checkaux_update;
	225	extern atomic_t fscache_n_checkaux_obsolete;
	226
52bd75fd DH	227	extern atomic_t fscache_n_cop_alloc_object;
	228	extern atomic_t fscache_n_cop_lookup_object;
	229	extern atomic_t fscache_n_cop_lookup_complete;
	230	extern atomic_t fscache_n_cop_grab_object;
	231	extern atomic_t fscache_n_cop_update_object;
	232	extern atomic_t fscache_n_cop_drop_object;
	233	extern atomic_t fscache_n_cop_put_object;
	234	extern atomic_t fscache_n_cop_sync_cache;
	235	extern atomic_t fscache_n_cop_attr_changed;
	236	extern atomic_t fscache_n_cop_read_or_alloc_page;
	237	extern atomic_t fscache_n_cop_read_or_alloc_pages;
	238	extern atomic_t fscache_n_cop_allocate_page;
	239	extern atomic_t fscache_n_cop_allocate_pages;
	240	extern atomic_t fscache_n_cop_write_page;
	241	extern atomic_t fscache_n_cop_uncache_page;
	242	extern atomic_t fscache_n_cop_dissociate_pages;
	243
7394daa8 DH	244	static inline void fscache_stat(atomic_t *stat)
	245	{
	246	atomic_inc(stat);
	247	}
	248
52bd75fd DH	249	static inline void fscache_stat_d(atomic_t *stat)
	250	{
	251	atomic_dec(stat);
	252	}
	253
60d543ca DH	254	#define __fscache_stat(stat) (stat)
60d543ca DH	255
7394daa8 DH	256	extern const struct file_operations fscache_stats_fops;
	257	#else
	258
60d543ca	259	#define __fscache_stat(stat) (NULL)
7394daa8 DH	260	#define fscache_stat(stat) do {} while (0)
	261	#endif
	262
0e04d4ce DH	263	/*
	264	* raise an event on an object
	265	* - if the event is not masked for that object, then the object is
	266	* queued for attention by the thread pool.
	267	*/
	268	static inline void fscache_raise_event(struct fscache_object *object,
	269	unsigned event)
	270	{
36c95590 DH	271	if (!test_and_set_bit(event, &object->events) &&
	272	test_bit(event, &object->event_mask))
	273	fscache_enqueue_object(object);
	274	}
	275
	276	/*
	277	* drop a reference to a cookie
	278	*/
	279	static inline void fscache_cookie_put(struct fscache_cookie *cookie)
	280	{
	281	BUG_ON(atomic_read(&cookie->usage) <= 0);
	282	if (atomic_dec_and_test(&cookie->usage))
	283	__fscache_cookie_put(cookie);
0e04d4ce DH	284	}
0e04d4ce DH	285
b5108822 DH	286	/*
	287	* get an extra reference to a netfs retrieval context
	288	*/
	289	static inline
	290	void fscache_get_context(struct fscache_cookie cookie, void *context)
	291	{
	292	if (cookie->def->get_context)
	293	cookie->def->get_context(cookie->netfs_data, context);
	294	return context;
	295	}
	296
	297	/*
	298	* release a reference to a netfs retrieval context
	299	*/
	300	static inline
	301	void fscache_put_context(struct fscache_cookie cookie, void context)
	302	{
	303	if (cookie->def->put_context)
	304	cookie->def->put_context(cookie->netfs_data, context);
	305	}
	306
06b3db1b DH	307	/*****************************************************************************/
	308	/*
	309	* debug tracing
	310	*/
	311	#define dbgprintk(FMT, ...) \
	312	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
	313
	314	/* make sure we maintain the format strings, even when debugging is disabled */
	315	static inline __attribute__((format(printf, 1, 2)))
	316	void _dbprintk(const char *fmt, ...)
	317	{
	318	}
	319
	320	#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	321	#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	322	#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
	323
	324	#define kjournal(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
	325
	326	#ifdef __KDEBUG
	327	#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
	328	#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
	329	#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
	330
	331	#elif defined(CONFIG_FSCACHE_DEBUG)
	332	#define _enter(FMT, ...) \
	333	do { \
	334	if (__do_kdebug(ENTER)) \
	335	kenter(FMT, ##__VA_ARGS__); \
	336	} while (0)
	337
	338	#define _leave(FMT, ...) \
	339	do { \
	340	if (__do_kdebug(LEAVE)) \
	341	kleave(FMT, ##__VA_ARGS__); \
	342	} while (0)
	343
	344	#define _debug(FMT, ...) \
	345	do { \
	346	if (__do_kdebug(DEBUG)) \
	347	kdebug(FMT, ##__VA_ARGS__); \
	348	} while (0)
	349
	350	#else
	351	#define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	352	#define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	353	#define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
	354	#endif
	355
	356	/*
	357	* determine whether a particular optional debugging point should be logged
	358	* - we need to go through three steps to persuade cpp to correctly join the
	359	* shorthand in FSCACHE_DEBUG_LEVEL with its prefix
	360	*/
	361	#define ____do_kdebug(LEVEL, POINT) \
	362	unlikely((fscache_debug & \
	363	(FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
	364	#define ___do_kdebug(LEVEL, POINT) \
	365	____do_kdebug(LEVEL, POINT)
	366	#define __do_kdebug(POINT) \
	367	___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
	368
	369	#define FSCACHE_DEBUG_CACHE 0
	370	#define FSCACHE_DEBUG_COOKIE 1
371	#define FSCACHE_DEBUG_PAGE 2
372	#define FSCACHE_DEBUG_OPERATION 3
373
374	#define FSCACHE_POINT_ENTER 1
375	#define FSCACHE_POINT_LEAVE 2
376	#define FSCACHE_POINT_DEBUG 4
377
378	#ifndef FSCACHE_DEBUG_LEVEL
379	#define FSCACHE_DEBUG_LEVEL CACHE
380	#endif
381
382	/*
383	* assertions
384	*/
385	#if 1 /* defined(__KDEBUGALL) */
386
387	#define ASSERT(X) \
388	do { \
389	if (unlikely(!(X))) { \
390	printk(KERN_ERR "\n"); \
391	printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
392	BUG(); \
393	} \
394	} while (0)
395
396	#define ASSERTCMP(X, OP, Y) \
397	do { \
398	if (unlikely(!((X) OP (Y)))) { \
399	printk(KERN_ERR "\n"); \
400	printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
401	printk(KERN_ERR "%lx " #OP " %lx is false\n", \
402	(unsigned long)(X), (unsigned long)(Y)); \
403	BUG(); \
404	} \
405	} while (0)
406
407	#define ASSERTIF(C, X) \
408	do { \
409	if (unlikely((C) && !(X))) { \
410	printk(KERN_ERR "\n"); \
411	printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
412	BUG(); \
413	} \
414	} while (0)
415
416	#define ASSERTIFCMP(C, X, OP, Y) \
417	do { \
418	if (unlikely((C) && !((X) OP (Y)))) { \
419	printk(KERN_ERR "\n"); \
420	printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
421	printk(KERN_ERR "%lx " #OP " %lx is false\n", \
422	(unsigned long)(X), (unsigned long)(Y)); \
423	BUG(); \
424	} \
425	} while (0)
426
427	#else
428
429	#define ASSERT(X) do {} while (0)
430	#define ASSERTCMP(X, OP, Y) do {} while (0)
431	#define ASSERTIF(C, X) do {} while (0)
432	#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
433
434	#endif /* assert or not */