[linux-2.6-block.git] / fs / cachefiles / internal.h

/* General netfs cache on cache files internal defs
 *
 * Copyright (C) 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 Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <linux/fscache-cache.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/security.h>

struct cachefiles_cache;
struct cachefiles_object;

extern unsigned cachefiles_debug;
#define CACHEFILES_DEBUG_KENTER	1
#define CACHEFILES_DEBUG_KLEAVE	2
#define CACHEFILES_DEBUG_KDEBUG	4

/*
 * node records
 */
struct cachefiles_object {
	struct fscache_object		fscache;	/* fscache handle */
	struct cachefiles_lookup_data	*lookup_data;	/* cached lookup data */
	struct dentry			*dentry;	/* the file/dir representing this object */
	struct dentry			*backer;	/* backing file */
	loff_t				i_size;		/* object size */
	unsigned long			flags;
#define CACHEFILES_OBJECT_ACTIVE	0		/* T if marked active */
	atomic_t			usage;		/* object usage count */
	uint8_t				type;		/* object type */
	uint8_t				new;		/* T if object new */
	spinlock_t			work_lock;
	struct rb_node			active_node;	/* link in active tree (dentry is key) */
};

extern struct kmem_cache *cachefiles_object_jar;

/*
 * Cache files cache definition
 */
struct cachefiles_cache {
	struct fscache_cache		cache;		/* FS-Cache record */
	struct vfsmount			*mnt;		/* mountpoint holding the cache */
	struct dentry			*graveyard;	/* directory into which dead objects go */
	struct file			*cachefilesd;	/* manager daemon handle */
	const struct cred		*cache_cred;	/* security override for accessing cache */
	struct mutex			daemon_mutex;	/* command serialisation mutex */
	wait_queue_head_t		daemon_pollwq;	/* poll waitqueue for daemon */
	struct rb_root			active_nodes;	/* active nodes (can't be culled) */
	rwlock_t			active_lock;	/* lock for active_nodes */
	atomic_t			gravecounter;	/* graveyard uniquifier */
	unsigned			frun_percent;	/* when to stop culling (% files) */
	unsigned			fcull_percent;	/* when to start culling (% files) */
	unsigned			fstop_percent;	/* when to stop allocating (% files) */
	unsigned			brun_percent;	/* when to stop culling (% blocks) */
	unsigned			bcull_percent;	/* when to start culling (% blocks) */
	unsigned			bstop_percent;	/* when to stop allocating (% blocks) */
	unsigned			bsize;		/* cache's block size */
	unsigned			bshift;		/* min(ilog2(PAGE_SIZE / bsize), 0) */
	uint64_t			frun;		/* when to stop culling */
	uint64_t			fcull;		/* when to start culling */
	uint64_t			fstop;		/* when to stop allocating */
	sector_t			brun;		/* when to stop culling */
	sector_t			bcull;		/* when to start culling */
	sector_t			bstop;		/* when to stop allocating */
	unsigned long			flags;
#define CACHEFILES_READY		0	/* T if cache prepared */
#define CACHEFILES_DEAD			1	/* T if cache dead */
#define CACHEFILES_CULLING		2	/* T if cull engaged */
#define CACHEFILES_STATE_CHANGED	3	/* T if state changed (poll trigger) */
	char				*rootdirname;	/* name of cache root directory */
	char				*secctx;	/* LSM security context */
	char				*tag;		/* cache binding tag */
};

/*
 * backing file read tracking
 */
struct cachefiles_one_read {
	wait_queue_t			monitor;	/* link into monitored waitqueue */
	struct page			*back_page;	/* backing file page we're waiting for */
	struct page			*netfs_page;	/* netfs page we're going to fill */
	struct fscache_retrieval	*op;		/* retrieval op covering this */
	struct list_head		op_link;	/* link in op's todo list */
};

/*
 * backing file write tracking
 */
struct cachefiles_one_write {
	struct page			*netfs_page;	/* netfs page to copy */
	struct cachefiles_object	*object;
	struct list_head		obj_link;	/* link in object's lists */
	fscache_rw_complete_t		end_io_func;
	void				*context;
};

/*
 * auxiliary data xattr buffer
 */
struct cachefiles_xattr {
	uint16_t			len;
	uint8_t				type;
	uint8_t				data[];
};

/*
 * note change of state for daemon
 */
static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
{
	set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
	wake_up_all(&cache->daemon_pollwq);
}

/*
 * bind.c
 */
extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);

/*
 * daemon.c
 */
extern const struct file_operations cachefiles_daemon_fops;

extern int cachefiles_has_space(struct cachefiles_cache *cache,
				unsigned fnr, unsigned bnr);

/*
 * interface.c
 */
extern const struct fscache_cache_ops cachefiles_cache_ops;

/*
 * key.c
 */
extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type);

/*
 * namei.c
 */
extern int cachefiles_delete_object(struct cachefiles_cache *cache,
				    struct cachefiles_object *object);
extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
				     struct cachefiles_object *object,
				     const char *key,
				     struct cachefiles_xattr *auxdata);
extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
					       struct dentry *dir,
					       const char *name);

extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
			   char *filename);

extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
				   struct dentry *dir, char *filename);

/*
 * proc.c
 */
#ifdef CONFIG_CACHEFILES_HISTOGRAM
extern atomic_t cachefiles_lookup_histogram[HZ];
extern atomic_t cachefiles_mkdir_histogram[HZ];
extern atomic_t cachefiles_create_histogram[HZ];

extern int __init cachefiles_proc_init(void);
extern void cachefiles_proc_cleanup(void);
static inline
void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
{
	unsigned long jif = jiffies - start_jif;
	if (jif >= HZ)
		jif = HZ - 1;
	atomic_inc(&histogram[jif]);
}

#else
#define cachefiles_proc_init()		(0)
#define cachefiles_proc_cleanup()	do {} while (0)
#define cachefiles_hist(hist, start_jif) do {} while (0)
#endif

/*
 * rdwr.c
 */
extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
					 struct page *, gfp_t);
extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
					  struct list_head *, unsigned *,
					  gfp_t);
extern int cachefiles_allocate_page(struct fscache_retrieval *, struct page *,
				    gfp_t);
extern int cachefiles_allocate_pages(struct fscache_retrieval *,
				     struct list_head *, unsigned *, gfp_t);
extern int cachefiles_write_page(struct fscache_storage *, struct page *);
extern void cachefiles_uncache_page(struct fscache_object *, struct page *);

/*
 * security.c
 */
extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
					       struct dentry *root,
					       const struct cred **_saved_cred);

static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
					   const struct cred **_saved_cred)
{
	*_saved_cred = override_creds(cache->cache_cred);
}

static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
					 const struct cred *saved_cred)
{
	revert_creds(saved_cred);
}

/*
 * xattr.c
 */
extern int cachefiles_check_object_type(struct cachefiles_object *object);
extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
				       struct cachefiles_xattr *auxdata);
extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
					  struct cachefiles_xattr *auxdata);
extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
					 struct cachefiles_xattr *auxdata);
extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
					  struct dentry *dentry);


/*
 * error handling
 */
#define kerror(FMT, ...) printk(KERN_ERR "CacheFiles: "FMT"\n", ##__VA_ARGS__)

#define cachefiles_io_error(___cache, FMT, ...)		\
do {							\
	kerror("I/O Error: " FMT, ##__VA_ARGS__);	\
	fscache_io_error(&(___cache)->cache);		\
	set_bit(CACHEFILES_DEAD, &(___cache)->flags);	\
} while (0)

#define cachefiles_io_error_obj(object, FMT, ...)			\
do {									\
	struct cachefiles_cache *___cache;				\
									\
	___cache = container_of((object)->fscache.cache,		\
				struct cachefiles_cache, cache);	\
	cachefiles_io_error(___cache, FMT, ##__VA_ARGS__);		\
} while (0)


/*
 * 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 void _dbprintk(const char *fmt, ...)
	__attribute__((format(printf, 1, 2)));
static inline 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__)


#if defined(__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_CACHEFILES_DEBUG)
#define _enter(FMT, ...)				\
do {							\
	if (cachefiles_debug & CACHEFILES_DEBUG_KENTER)	\
		kenter(FMT, ##__VA_ARGS__);		\
} while (0)

#define _leave(FMT, ...)				\
do {							\
	if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE)	\
		kleave(FMT, ##__VA_ARGS__);		\
} while (0)

#define _debug(FMT, ...)				\
do {							\
	if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG)	\
		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

#if 1 /* defined(__KDEBUGALL) */

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

#define ASSERTCMP(X, OP, Y)						\
do {									\
	if (unlikely(!((X) OP (Y)))) {					\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "CacheFiles: 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 "CacheFiles: 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 "CacheFiles: 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
Commit	Line	Data
9ae326a6 DH	1	/* General netfs cache on cache files internal defs
	2	*
	3	* Copyright (C) 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 Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/fscache-cache.h>
	13	#include <linux/timer.h>
	14	#include <linux/wait.h>
	15	#include <linux/workqueue.h>
	16	#include <linux/security.h>
	17
	18	struct cachefiles_cache;
	19	struct cachefiles_object;
	20
	21	extern unsigned cachefiles_debug;
	22	#define CACHEFILES_DEBUG_KENTER 1
	23	#define CACHEFILES_DEBUG_KLEAVE 2
	24	#define CACHEFILES_DEBUG_KDEBUG 4
	25
	26	/*
	27	* node records
	28	*/
	29	struct cachefiles_object {
	30	struct fscache_object fscache; /* fscache handle */
	31	struct cachefiles_lookup_data lookup_data; / cached lookup data */
	32	struct dentry dentry; / the file/dir representing this object */
	33	struct dentry backer; / backing file */
	34	loff_t i_size; /* object size */
	35	unsigned long flags;
	36	#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
	37	atomic_t usage; /* object usage count */
	38	uint8_t type; /* object type */
	39	uint8_t new; /* T if object new */
	40	spinlock_t work_lock;
	41	struct rb_node active_node; /* link in active tree (dentry is key) */
	42	};
	43
	44	extern struct kmem_cache *cachefiles_object_jar;
	45
	46	/*
	47	* Cache files cache definition
	48	*/
	49	struct cachefiles_cache {
	50	struct fscache_cache cache; /* FS-Cache record */
	51	struct vfsmount mnt; / mountpoint holding the cache */
	52	struct dentry graveyard; / directory into which dead objects go */
	53	struct file cachefilesd; / manager daemon handle */
	54	const struct cred cache_cred; / security override for accessing cache */
	55	struct mutex daemon_mutex; /* command serialisation mutex */
	56	wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
	57	struct rb_root active_nodes; /* active nodes (can't be culled) */
	58	rwlock_t active_lock; /* lock for active_nodes */
	59	atomic_t gravecounter; /* graveyard uniquifier */
	60	unsigned frun_percent; /* when to stop culling (% files) */
	61	unsigned fcull_percent; /* when to start culling (% files) */
	62	unsigned fstop_percent; /* when to stop allocating (% files) */
	63	unsigned brun_percent; /* when to stop culling (% blocks) */
	64	unsigned bcull_percent; /* when to start culling (% blocks) */
65	unsigned bstop_percent; /* when to stop allocating (% blocks) */
66	unsigned bsize; /* cache's block size */
67	unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
68	uint64_t frun; /* when to stop culling */
69	uint64_t fcull; /* when to start culling */
70	uint64_t fstop; /* when to stop allocating */
71	sector_t brun; /* when to stop culling */
72	sector_t bcull; /* when to start culling */
73	sector_t bstop; /* when to stop allocating */
74	unsigned long flags;
75	#define CACHEFILES_READY 0 /* T if cache prepared */
76	#define CACHEFILES_DEAD 1 /* T if cache dead */
77	#define CACHEFILES_CULLING 2 /* T if cull engaged */
78	#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
79	char rootdirname; / name of cache root directory */
80	char secctx; / LSM security context */
81	char tag; / cache binding tag */
82	};
83
84	/*
85	* backing file read tracking
86	*/
87	struct cachefiles_one_read {
88	wait_queue_t monitor; /* link into monitored waitqueue */
89	struct page back_page; / backing file page we're waiting for */
90	struct page netfs_page; / netfs page we're going to fill */
91	struct fscache_retrieval op; / retrieval op covering this */
92	struct list_head op_link; /* link in op's todo list */
93	};
94
95	/*
96	* backing file write tracking
97	*/
98	struct cachefiles_one_write {
99	struct page netfs_page; / netfs page to copy */
100	struct cachefiles_object *object;
101	struct list_head obj_link; /* link in object's lists */
102	fscache_rw_complete_t end_io_func;
103	void *context;
104	};
105
106	/*
107	* auxiliary data xattr buffer
108	*/
109	struct cachefiles_xattr {
110	uint16_t len;
111	uint8_t type;
112	uint8_t data[];
113	};
114
115	/*
116	* note change of state for daemon
117	*/
118	static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
119	{
120	set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
121	wake_up_all(&cache->daemon_pollwq);
122	}
123
124	/*
911e690e	125	* bind.c
9ae326a6 DH	126	*/
	127	extern int cachefiles_daemon_bind(struct cachefiles_cache cache, char args);
	128	extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
	129
	130	/*
911e690e	131	* daemon.c
9ae326a6 DH	132	*/
	133	extern const struct file_operations cachefiles_daemon_fops;
	134
	135	extern int cachefiles_has_space(struct cachefiles_cache *cache,
	136	unsigned fnr, unsigned bnr);
	137
	138	/*
911e690e	139	* interface.c
9ae326a6 DH	140	*/
	141	extern const struct fscache_cache_ops cachefiles_cache_ops;
	142
	143	/*
911e690e	144	* key.c
9ae326a6 DH	145	*/
	146	extern char cachefiles_cook_key(const u8 raw, int keylen, uint8_t type);
	147
	148	/*
911e690e	149	* namei.c
9ae326a6 DH	150	*/
	151	extern int cachefiles_delete_object(struct cachefiles_cache *cache,
	152	struct cachefiles_object *object);
	153	extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
	154	struct cachefiles_object *object,
	155	const char *key,
	156	struct cachefiles_xattr *auxdata);
	157	extern struct dentry cachefiles_get_directory(struct cachefiles_cache cache,
	158	struct dentry *dir,
	159	const char *name);
	160
	161	extern int cachefiles_cull(struct cachefiles_cache cache, struct dentry dir,
	162	char *filename);
	163
	164	extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
	165	struct dentry dir, char filename);
	166
	167	/*
911e690e	168	* proc.c
9ae326a6 DH	169	*/
	170	#ifdef CONFIG_CACHEFILES_HISTOGRAM
	171	extern atomic_t cachefiles_lookup_histogram[HZ];
	172	extern atomic_t cachefiles_mkdir_histogram[HZ];
	173	extern atomic_t cachefiles_create_histogram[HZ];
	174
	175	extern int __init cachefiles_proc_init(void);
	176	extern void cachefiles_proc_cleanup(void);
	177	static inline
	178	void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
	179	{
	180	unsigned long jif = jiffies - start_jif;
	181	if (jif >= HZ)
	182	jif = HZ - 1;
	183	atomic_inc(&histogram[jif]);
	184	}
	185
	186	#else
	187	#define cachefiles_proc_init() (0)
	188	#define cachefiles_proc_cleanup() do {} while (0)
	189	#define cachefiles_hist(hist, start_jif) do {} while (0)
	190	#endif
	191
	192	/*
911e690e	193	* rdwr.c
9ae326a6 DH	194	*/
	195	extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
	196	struct page *, gfp_t);
	197	extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
	198	struct list_head , unsigned ,
	199	gfp_t);
	200	extern int cachefiles_allocate_page(struct fscache_retrieval , struct page ,
	201	gfp_t);
	202	extern int cachefiles_allocate_pages(struct fscache_retrieval *,
	203	struct list_head , unsigned , gfp_t);
	204	extern int cachefiles_write_page(struct fscache_storage , struct page );
	205	extern void cachefiles_uncache_page(struct fscache_object , struct page );
	206
	207	/*
911e690e	208	* security.c
9ae326a6 DH	209	*/
	210	extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
	211	extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
	212	struct dentry *root,
	213	const struct cred **_saved_cred);
	214
	215	static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
	216	const struct cred **_saved_cred)
	217	{
	218	*_saved_cred = override_creds(cache->cache_cred);
	219	}
	220
	221	static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
	222	const struct cred *saved_cred)
	223	{
	224	revert_creds(saved_cred);
	225	}
	226
	227	/*
911e690e	228	* xattr.c
9ae326a6 DH	229	*/
	230	extern int cachefiles_check_object_type(struct cachefiles_object *object);
	231	extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
	232	struct cachefiles_xattr *auxdata);
	233	extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
	234	struct cachefiles_xattr *auxdata);
	235	extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
	236	struct cachefiles_xattr *auxdata);
	237	extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
	238	struct dentry *dentry);
	239
	240
	241	/*
	242	* error handling
	243	*/
	244	#define kerror(FMT, ...) printk(KERN_ERR "CacheFiles: "FMT"\n", ##__VA_ARGS__)
	245
	246	#define cachefiles_io_error(___cache, FMT, ...) \
	247	do { \
	248	kerror("I/O Error: " FMT, ##__VA_ARGS__); \
	249	fscache_io_error(&(___cache)->cache); \
	250	set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
	251	} while (0)
	252
	253	#define cachefiles_io_error_obj(object, FMT, ...) \
	254	do { \
	255	struct cachefiles_cache *___cache; \
	256	\
	257	___cache = container_of((object)->fscache.cache, \
	258	struct cachefiles_cache, cache); \
	259	cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
	260	} while (0)
	261
	262
	263	/*
	264	* debug tracing
	265	*/
	266	#define dbgprintk(FMT, ...) \
	267	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
	268
	269	/* make sure we maintain the format strings, even when debugging is disabled */
	270	static inline void _dbprintk(const char *fmt, ...)
	271	__attribute__((format(printf, 1, 2)));
	272	static inline void _dbprintk(const char *fmt, ...)
	273	{
	274	}
	275
	276	#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	277	#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	278	#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
	279
	280
	281	#if defined(__KDEBUG)
	282	#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
	283	#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
	284	#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
	285
	286	#elif defined(CONFIG_CACHEFILES_DEBUG)
	287	#define _enter(FMT, ...) \
	288	do { \
	289	if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
	290	kenter(FMT, ##__VA_ARGS__); \
	291	} while (0)
	292
293	#define _leave(FMT, ...) \
294	do { \
295	if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
296	kleave(FMT, ##__VA_ARGS__); \
297	} while (0)
298
299	#define _debug(FMT, ...) \
300	do { \
301	if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
302	kdebug(FMT, ##__VA_ARGS__); \
303	} while (0)
304
305	#else
306	#define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
307	#define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
308	#define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
309	#endif
310
311	#if 1 /* defined(__KDEBUGALL) */
312
313	#define ASSERT(X) \
314	do { \
315	if (unlikely(!(X))) { \
316	printk(KERN_ERR "\n"); \
317	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
318	BUG(); \
319	} \
320	} while (0)
321
322	#define ASSERTCMP(X, OP, Y) \
323	do { \
324	if (unlikely(!((X) OP (Y)))) { \
325	printk(KERN_ERR "\n"); \
326	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
327	printk(KERN_ERR "%lx " #OP " %lx is false\n", \
328	(unsigned long)(X), (unsigned long)(Y)); \
329	BUG(); \
330	} \
331	} while (0)
332
333	#define ASSERTIF(C, X) \
334	do { \
335	if (unlikely((C) && !(X))) { \
336	printk(KERN_ERR "\n"); \
337	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
338	BUG(); \
339	} \
340	} while (0)
341
342	#define ASSERTIFCMP(C, X, OP, Y) \
343	do { \
344	if (unlikely((C) && !((X) OP (Y)))) { \
345	printk(KERN_ERR "\n"); \
346	printk(KERN_ERR "CacheFiles: 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	#else
354
355	#define ASSERT(X) do {} while (0)
356	#define ASSERTCMP(X, OP, Y) do {} while (0)
357	#define ASSERTIF(C, X) do {} while (0)
358	#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
359
360	#endif