[mirror_ubuntu-bionic-kernel.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

#define cachefiles_gfp (__GFP_WAIT | __GFP_NORETRY | __GFP_NOMEMALLOC)

/*
 * 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 */
#define CACHEFILES_OBJECT_BURIED	1		/* T if preemptively buried */
	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__)

#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, ...) 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

#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
5f4f9f4a DH	26	#define cachefiles_gfp (__GFP_WAIT \| __GFP_NORETRY \| __GFP_NOMEMALLOC)
5f4f9f4a DH	27
9ae326a6 DH	28	/*
	29	* node records
	30	*/
	31	struct cachefiles_object {
	32	struct fscache_object fscache; /* fscache handle */
	33	struct cachefiles_lookup_data lookup_data; / cached lookup data */
	34	struct dentry dentry; / the file/dir representing this object */
	35	struct dentry backer; / backing file */
	36	loff_t i_size; /* object size */
	37	unsigned long flags;
	38	#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
c61ea31d	39	#define CACHEFILES_OBJECT_BURIED 1 /* T if preemptively buried */
9ae326a6 DH	40	atomic_t usage; /* object usage count */
	41	uint8_t type; /* object type */
	42	uint8_t new; /* T if object new */
	43	spinlock_t work_lock;
	44	struct rb_node active_node; /* link in active tree (dentry is key) */
	45	};
	46
	47	extern struct kmem_cache *cachefiles_object_jar;
	48
	49	/*
	50	* Cache files cache definition
	51	*/
	52	struct cachefiles_cache {
	53	struct fscache_cache cache; /* FS-Cache record */
	54	struct vfsmount mnt; / mountpoint holding the cache */
	55	struct dentry graveyard; / directory into which dead objects go */
	56	struct file cachefilesd; / manager daemon handle */
	57	const struct cred cache_cred; / security override for accessing cache */
	58	struct mutex daemon_mutex; /* command serialisation mutex */
	59	wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
	60	struct rb_root active_nodes; /* active nodes (can't be culled) */
	61	rwlock_t active_lock; /* lock for active_nodes */
	62	atomic_t gravecounter; /* graveyard uniquifier */
	63	unsigned frun_percent; /* when to stop culling (% files) */
	64	unsigned fcull_percent; /* when to start culling (% files) */
	65	unsigned fstop_percent; /* when to stop allocating (% files) */
	66	unsigned brun_percent; /* when to stop culling (% blocks) */
	67	unsigned bcull_percent; /* when to start culling (% blocks) */
	68	unsigned bstop_percent; /* when to stop allocating (% blocks) */
	69	unsigned bsize; /* cache's block size */
	70	unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
	71	uint64_t frun; /* when to stop culling */
	72	uint64_t fcull; /* when to start culling */
	73	uint64_t fstop; /* when to stop allocating */
	74	sector_t brun; /* when to stop culling */
	75	sector_t bcull; /* when to start culling */
	76	sector_t bstop; /* when to stop allocating */
	77	unsigned long flags;
	78	#define CACHEFILES_READY 0 /* T if cache prepared */
	79	#define CACHEFILES_DEAD 1 /* T if cache dead */
	80	#define CACHEFILES_CULLING 2 /* T if cull engaged */
	81	#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
	82	char rootdirname; / name of cache root directory */
	83	char secctx; / LSM security context */
	84	char tag; / cache binding tag */
	85	};
	86
	87	/*
	88	* backing file read tracking
	89	*/
	90	struct cachefiles_one_read {
	91	wait_queue_t monitor; /* link into monitored waitqueue */
	92	struct page back_page; / backing file page we're waiting for */
	93	struct page netfs_page; / netfs page we're going to fill */
	94	struct fscache_retrieval op; / retrieval op covering this */
	95	struct list_head op_link; /* link in op's todo list */
	96	};
	97
	98	/*
	99	* backing file write tracking
	100	*/
	101	struct cachefiles_one_write {
	102	struct page netfs_page; / netfs page to copy */
	103	struct cachefiles_object *object;
104	struct list_head obj_link; /* link in object's lists */
105	fscache_rw_complete_t end_io_func;
106	void *context;
107	};
108
109	/*
110	* auxiliary data xattr buffer
111	*/
112	struct cachefiles_xattr {
113	uint16_t len;
114	uint8_t type;
115	uint8_t data[];
116	};
117
118	/*
119	* note change of state for daemon
120	*/
121	static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
122	{
123	set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
124	wake_up_all(&cache->daemon_pollwq);
125	}
126
127	/*
911e690e	128	* bind.c
9ae326a6 DH	129	*/
	130	extern int cachefiles_daemon_bind(struct cachefiles_cache cache, char args);
	131	extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
	132
	133	/*
911e690e	134	* daemon.c
9ae326a6 DH	135	*/
	136	extern const struct file_operations cachefiles_daemon_fops;
	137
	138	extern int cachefiles_has_space(struct cachefiles_cache *cache,
	139	unsigned fnr, unsigned bnr);
	140
	141	/*
911e690e	142	* interface.c
9ae326a6 DH	143	*/
	144	extern const struct fscache_cache_ops cachefiles_cache_ops;
	145
	146	/*
911e690e	147	* key.c
9ae326a6 DH	148	*/
	149	extern char cachefiles_cook_key(const u8 raw, int keylen, uint8_t type);
	150
	151	/*
911e690e	152	* namei.c
9ae326a6 DH	153	*/
	154	extern int cachefiles_delete_object(struct cachefiles_cache *cache,
	155	struct cachefiles_object *object);
	156	extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
	157	struct cachefiles_object *object,
	158	const char *key,
	159	struct cachefiles_xattr *auxdata);
	160	extern struct dentry cachefiles_get_directory(struct cachefiles_cache cache,
	161	struct dentry *dir,
	162	const char *name);
	163
	164	extern int cachefiles_cull(struct cachefiles_cache cache, struct dentry dir,
	165	char *filename);
	166
	167	extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
	168	struct dentry dir, char filename);
	169
	170	/*
911e690e	171	* proc.c
9ae326a6 DH	172	*/
	173	#ifdef CONFIG_CACHEFILES_HISTOGRAM
	174	extern atomic_t cachefiles_lookup_histogram[HZ];
	175	extern atomic_t cachefiles_mkdir_histogram[HZ];
	176	extern atomic_t cachefiles_create_histogram[HZ];
	177
	178	extern int __init cachefiles_proc_init(void);
	179	extern void cachefiles_proc_cleanup(void);
	180	static inline
	181	void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
	182	{
	183	unsigned long jif = jiffies - start_jif;
	184	if (jif >= HZ)
	185	jif = HZ - 1;
	186	atomic_inc(&histogram[jif]);
	187	}
	188
	189	#else
	190	#define cachefiles_proc_init() (0)
	191	#define cachefiles_proc_cleanup() do {} while (0)
	192	#define cachefiles_hist(hist, start_jif) do {} while (0)
	193	#endif
	194
	195	/*
911e690e	196	* rdwr.c
9ae326a6 DH	197	*/
	198	extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
	199	struct page *, gfp_t);
	200	extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
	201	struct list_head , unsigned ,
	202	gfp_t);
	203	extern int cachefiles_allocate_page(struct fscache_retrieval , struct page ,
	204	gfp_t);
	205	extern int cachefiles_allocate_pages(struct fscache_retrieval *,
	206	struct list_head , unsigned , gfp_t);
	207	extern int cachefiles_write_page(struct fscache_storage , struct page );
	208	extern void cachefiles_uncache_page(struct fscache_object , struct page );
	209
	210	/*
911e690e	211	* security.c
9ae326a6 DH	212	*/
	213	extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
	214	extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
	215	struct dentry *root,
	216	const struct cred **_saved_cred);
	217
	218	static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
	219	const struct cred **_saved_cred)
	220	{
	221	*_saved_cred = override_creds(cache->cache_cred);
	222	}
	223
	224	static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
	225	const struct cred *saved_cred)
	226	{
	227	revert_creds(saved_cred);
	228	}
	229
	230	/*
911e690e	231	* xattr.c
9ae326a6 DH	232	*/
	233	extern int cachefiles_check_object_type(struct cachefiles_object *object);
	234	extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
	235	struct cachefiles_xattr *auxdata);
	236	extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
	237	struct cachefiles_xattr *auxdata);
	238	extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
	239	struct cachefiles_xattr *auxdata);
	240	extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
	241	struct dentry *dentry);
	242
	243
	244	/*
	245	* error handling
	246	*/
	247	#define kerror(FMT, ...) printk(KERN_ERR "CacheFiles: "FMT"\n", ##__VA_ARGS__)
	248
	249	#define cachefiles_io_error(___cache, FMT, ...) \
	250	do { \
	251	kerror("I/O Error: " FMT, ##__VA_ARGS__); \
	252	fscache_io_error(&(___cache)->cache); \
	253	set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
	254	} while (0)
	255
	256	#define cachefiles_io_error_obj(object, FMT, ...) \
	257	do { \
	258	struct cachefiles_cache *___cache; \
	259	\
	260	___cache = container_of((object)->fscache.cache, \
	261	struct cachefiles_cache, cache); \
	262	cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
	263	} while (0)
	264
	265
	266	/*
	267	* debug tracing
	268	*/
	269	#define dbgprintk(FMT, ...) \
	270	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
	271
9ae326a6 DH	272	#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	273	#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	274	#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
	275
	276
	277	#if defined(__KDEBUG)
	278	#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
	279	#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
	280	#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
	281
	282	#elif defined(CONFIG_CACHEFILES_DEBUG)
	283	#define _enter(FMT, ...) \
	284	do { \
	285	if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
	286	kenter(FMT, ##__VA_ARGS__); \
	287	} while (0)
	288
	289	#define _leave(FMT, ...) \
	290	do { \
	291	if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
	292	kleave(FMT, ##__VA_ARGS__); \
	293	} while (0)
	294
	295	#define _debug(FMT, ...) \
	296	do { \
	297	if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
	298	kdebug(FMT, ##__VA_ARGS__); \
	299	} while (0)
	300
	301	#else
12fdff3f DH	302	#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	303	#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	304	#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
9ae326a6 DH	305	#endif
	306
	307	#if 1 /* defined(__KDEBUGALL) */
	308
	309	#define ASSERT(X) \
	310	do { \
	311	if (unlikely(!(X))) { \
	312	printk(KERN_ERR "\n"); \
	313	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
	314	BUG(); \
	315	} \
	316	} while (0)
	317
	318	#define ASSERTCMP(X, OP, Y) \
	319	do { \
	320	if (unlikely(!((X) OP (Y)))) { \
	321	printk(KERN_ERR "\n"); \
	322	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
	323	printk(KERN_ERR "%lx " #OP " %lx is false\n", \
	324	(unsigned long)(X), (unsigned long)(Y)); \
	325	BUG(); \
	326	} \
	327	} while (0)
	328
	329	#define ASSERTIF(C, X) \
	330	do { \
	331	if (unlikely((C) && !(X))) { \
	332	printk(KERN_ERR "\n"); \
	333	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
	334	BUG(); \
	335	} \
	336	} while (0)
	337
	338	#define ASSERTIFCMP(C, X, OP, Y) \
	339	do { \
	340	if (unlikely((C) && !((X) OP (Y)))) { \
	341	printk(KERN_ERR "\n"); \
	342	printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
	343	printk(KERN_ERR "%lx " #OP " %lx is false\n", \
	344	(unsigned long)(X), (unsigned long)(Y)); \
	345	BUG(); \
	346	} \
	347	} while (0)
	348
	349	#else
	350
	351	#define ASSERT(X) do {} while (0)
	352	#define ASSERTCMP(X, OP, Y) do {} while (0)
	353	#define ASSERTIF(C, X) do {} while (0)
	354	#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
	355
	356	#endif