[deliverable/linux.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 struct workqueue_struct *fscache_object_wq;
extern struct workqueue_struct *fscache_op_wq;
DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);

static inline bool fscache_object_congested(void)
{
	return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq);
}

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 *,
			     void (*)(struct fscache_operation *));
extern void fscache_cancel_all_ops(struct fscache_object *);
extern void fscache_abort_object(struct fscache_object *);
extern void fscache_start_operations(struct fscache_object *);
extern void fscache_operation_gc(struct work_struct *);

/*
 * page.c
 */
extern void fscache_invalidate_writes(struct fscache_cookie *);

/*
 * 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_store_vmscan_wait;

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_invalidates;
extern atomic_t fscache_n_invalidates_run;

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_lookups_timed_out;
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_invalidate_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)
#define fscache_stat_d(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)
{
	BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS);
	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__)

#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, ...) no_printk(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, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
#define _debug(FMT, ...) no_printk(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;
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];
4fbf4291 DH	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 *,
91c7fbbf DH	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)
60d543ca DH	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
7394daa8 DH	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	}
0e04d4ce DH	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 */