[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.
 */

#ifdef pr_fmt
#undef pr_fmt
#endif

#define pr_fmt(fmt) "CacheFiles: " fmt


#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_RECLAIM | __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 */
	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 */
	atomic_t			f_released;	/* number of objects released lately */
	atomic_long_t			b_released;	/* number of blocks released lately */
	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 void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
					    struct cachefiles_object *object);
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_auxdata(struct cachefiles_object *object);
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 cachefiles_io_error(___cache, FMT, ...)		\
do {							\
	pr_err("I/O Error: " FMT"\n", ##__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))) {						\
		pr_err("\n");						\
		pr_err("Assertion failed\n");		\
		BUG();							\
	}								\
} while (0)

#define ASSERTCMP(X, OP, Y)						\
do {									\
	if (unlikely(!((X) OP (Y)))) {					\
		pr_err("\n");						\
		pr_err("Assertion failed\n");		\
		pr_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))) {					\
		pr_err("\n");						\
		pr_err("Assertion failed\n");		\
		BUG();							\
	}								\
} while (0)

#define ASSERTIFCMP(C, X, OP, Y)					\
do {									\
	if (unlikely((C) && !((X) OP (Y)))) {				\
		pr_err("\n");						\
		pr_err("Assertion failed\n");		\
		pr_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
0227d6ab FF	12	#ifdef pr_fmt
	13	#undef pr_fmt
	14	#endif
	15
	16	#define pr_fmt(fmt) "CacheFiles: " fmt
	17
	18
9ae326a6 DH	19	#include <linux/fscache-cache.h>
	20	#include <linux/timer.h>
	21	#include <linux/wait.h>
	22	#include <linux/workqueue.h>
	23	#include <linux/security.h>
	24
	25	struct cachefiles_cache;
	26	struct cachefiles_object;
	27
	28	extern unsigned cachefiles_debug;
	29	#define CACHEFILES_DEBUG_KENTER 1
	30	#define CACHEFILES_DEBUG_KLEAVE 2
	31	#define CACHEFILES_DEBUG_KDEBUG 4
	32
71baba4b	33	#define cachefiles_gfp (__GFP_RECLAIM \| __GFP_NORETRY \| __GFP_NOMEMALLOC)
5f4f9f4a	34
9ae326a6 DH	35	/*
	36	* node records
	37	*/
	38	struct cachefiles_object {
	39	struct fscache_object fscache; /* fscache handle */
	40	struct cachefiles_lookup_data lookup_data; / cached lookup data */
	41	struct dentry dentry; / the file/dir representing this object */
	42	struct dentry backer; / backing file */
	43	loff_t i_size; /* object size */
	44	unsigned long flags;
	45	#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
	46	atomic_t usage; /* object usage count */
	47	uint8_t type; /* object type */
	48	uint8_t new; /* T if object new */
	49	spinlock_t work_lock;
	50	struct rb_node active_node; /* link in active tree (dentry is key) */
	51	};
	52
	53	extern struct kmem_cache *cachefiles_object_jar;
	54
	55	/*
	56	* Cache files cache definition
	57	*/
	58	struct cachefiles_cache {
	59	struct fscache_cache cache; /* FS-Cache record */
	60	struct vfsmount mnt; / mountpoint holding the cache */
	61	struct dentry graveyard; / directory into which dead objects go */
	62	struct file cachefilesd; / manager daemon handle */
	63	const struct cred cache_cred; / security override for accessing cache */
	64	struct mutex daemon_mutex; /* command serialisation mutex */
	65	wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
	66	struct rb_root active_nodes; /* active nodes (can't be culled) */
	67	rwlock_t active_lock; /* lock for active_nodes */
	68	atomic_t gravecounter; /* graveyard uniquifier */
a5b3a80b DH	69	atomic_t f_released; /* number of objects released lately */
a5b3a80b DH	70	atomic_long_t b_released; /* number of blocks released lately */
9ae326a6 DH	71	unsigned frun_percent; /* when to stop culling (% files) */
	72	unsigned fcull_percent; /* when to start culling (% files) */
	73	unsigned fstop_percent; /* when to stop allocating (% files) */
	74	unsigned brun_percent; /* when to stop culling (% blocks) */
	75	unsigned bcull_percent; /* when to start culling (% blocks) */
	76	unsigned bstop_percent; /* when to stop allocating (% blocks) */
	77	unsigned bsize; /* cache's block size */
	78	unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
	79	uint64_t frun; /* when to stop culling */
	80	uint64_t fcull; /* when to start culling */
	81	uint64_t fstop; /* when to stop allocating */
	82	sector_t brun; /* when to stop culling */
	83	sector_t bcull; /* when to start culling */
	84	sector_t bstop; /* when to stop allocating */
	85	unsigned long flags;
	86	#define CACHEFILES_READY 0 /* T if cache prepared */
	87	#define CACHEFILES_DEAD 1 /* T if cache dead */
	88	#define CACHEFILES_CULLING 2 /* T if cull engaged */
	89	#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
	90	char rootdirname; / name of cache root directory */
	91	char secctx; / LSM security context */
	92	char tag; / cache binding tag */
	93	};
	94
	95	/*
	96	* backing file read tracking
	97	*/
	98	struct cachefiles_one_read {
	99	wait_queue_t monitor; /* link into monitored waitqueue */
	100	struct page back_page; / backing file page we're waiting for */
	101	struct page netfs_page; / netfs page we're going to fill */
	102	struct fscache_retrieval op; / retrieval op covering this */
	103	struct list_head op_link; /* link in op's todo list */
	104	};
	105
	106	/*
	107	* backing file write tracking
	108	*/
	109	struct cachefiles_one_write {
	110	struct page netfs_page; / netfs page to copy */
	111	struct cachefiles_object *object;
	112	struct list_head obj_link; /* link in object's lists */
	113	fscache_rw_complete_t end_io_func;
	114	void *context;
	115	};
	116
	117	/*
	118	* auxiliary data xattr buffer
	119	*/
	120	struct cachefiles_xattr {
	121	uint16_t len;
	122	uint8_t type;
	123	uint8_t data[];
	124	};
	125
	126	/*
	127	* note change of state for daemon
	128	*/
	129	static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
	130	{
	131	set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
	132	wake_up_all(&cache->daemon_pollwq);
	133	}
	134
135	/*
911e690e	136	* bind.c
9ae326a6 DH	137	*/
	138	extern int cachefiles_daemon_bind(struct cachefiles_cache cache, char args);
	139	extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
	140
	141	/*
911e690e	142	* daemon.c
9ae326a6 DH	143	*/
	144	extern const struct file_operations cachefiles_daemon_fops;
	145
	146	extern int cachefiles_has_space(struct cachefiles_cache *cache,
	147	unsigned fnr, unsigned bnr);
	148
	149	/*
911e690e	150	* interface.c
9ae326a6 DH	151	*/
	152	extern const struct fscache_cache_ops cachefiles_cache_ops;
	153
	154	/*
911e690e	155	* key.c
9ae326a6 DH	156	*/
	157	extern char cachefiles_cook_key(const u8 raw, int keylen, uint8_t type);
	158
	159	/*
911e690e	160	* namei.c
9ae326a6	161	*/
a5b3a80b DH	162	extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
a5b3a80b DH	163	struct cachefiles_object *object);
9ae326a6 DH	164	extern int cachefiles_delete_object(struct cachefiles_cache *cache,
	165	struct cachefiles_object *object);
	166	extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
	167	struct cachefiles_object *object,
	168	const char *key,
	169	struct cachefiles_xattr *auxdata);
	170	extern struct dentry cachefiles_get_directory(struct cachefiles_cache cache,
	171	struct dentry *dir,
	172	const char *name);
	173
	174	extern int cachefiles_cull(struct cachefiles_cache cache, struct dentry dir,
	175	char *filename);
	176
	177	extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
	178	struct dentry dir, char filename);
	179
	180	/*
911e690e	181	* proc.c
9ae326a6 DH	182	*/
	183	#ifdef CONFIG_CACHEFILES_HISTOGRAM
	184	extern atomic_t cachefiles_lookup_histogram[HZ];
	185	extern atomic_t cachefiles_mkdir_histogram[HZ];
	186	extern atomic_t cachefiles_create_histogram[HZ];
	187
	188	extern int __init cachefiles_proc_init(void);
	189	extern void cachefiles_proc_cleanup(void);
	190	static inline
	191	void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
	192	{
	193	unsigned long jif = jiffies - start_jif;
	194	if (jif >= HZ)
	195	jif = HZ - 1;
	196	atomic_inc(&histogram[jif]);
	197	}
	198
	199	#else
	200	#define cachefiles_proc_init() (0)
	201	#define cachefiles_proc_cleanup() do {} while (0)
	202	#define cachefiles_hist(hist, start_jif) do {} while (0)
	203	#endif
	204
	205	/*
911e690e	206	* rdwr.c
9ae326a6 DH	207	*/
	208	extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
	209	struct page *, gfp_t);
	210	extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
	211	struct list_head , unsigned ,
	212	gfp_t);
	213	extern int cachefiles_allocate_page(struct fscache_retrieval , struct page ,
	214	gfp_t);
	215	extern int cachefiles_allocate_pages(struct fscache_retrieval *,
	216	struct list_head , unsigned , gfp_t);
	217	extern int cachefiles_write_page(struct fscache_storage , struct page );
	218	extern void cachefiles_uncache_page(struct fscache_object , struct page );
	219
	220	/*
911e690e	221	* security.c
9ae326a6 DH	222	*/
	223	extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
	224	extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
	225	struct dentry *root,
	226	const struct cred **_saved_cred);
	227
	228	static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
	229	const struct cred **_saved_cred)
	230	{
	231	*_saved_cred = override_creds(cache->cache_cred);
	232	}
	233
	234	static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
	235	const struct cred *saved_cred)
	236	{
	237	revert_creds(saved_cred);
	238	}
	239
	240	/*
911e690e	241	* xattr.c
9ae326a6 DH	242	*/
	243	extern int cachefiles_check_object_type(struct cachefiles_object *object);
	244	extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
	245	struct cachefiles_xattr *auxdata);
	246	extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
	247	struct cachefiles_xattr *auxdata);
5002d7be	248	extern int cachefiles_check_auxdata(struct cachefiles_object *object);
9ae326a6 DH	249	extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
	250	struct cachefiles_xattr *auxdata);
	251	extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
	252	struct dentry *dentry);
	253
	254
	255	/*
	256	* error handling
	257	*/
9ae326a6 DH	258
	259	#define cachefiles_io_error(___cache, FMT, ...) \
	260	do { \
6ff66ac7	261	pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
9ae326a6 DH	262	fscache_io_error(&(___cache)->cache); \
	263	set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
	264	} while (0)
	265
	266	#define cachefiles_io_error_obj(object, FMT, ...) \
	267	do { \
	268	struct cachefiles_cache *___cache; \
	269	\
	270	___cache = container_of((object)->fscache.cache, \
	271	struct cachefiles_cache, cache); \
	272	cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
	273	} while (0)
	274
	275
	276	/*
	277	* debug tracing
	278	*/
	279	#define dbgprintk(FMT, ...) \
	280	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
	281
9ae326a6 DH	282	#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	283	#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	284	#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
	285
	286
	287	#if defined(__KDEBUG)
	288	#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
	289	#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
	290	#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
	291
	292	#elif defined(CONFIG_CACHEFILES_DEBUG)
	293	#define _enter(FMT, ...) \
	294	do { \
	295	if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
	296	kenter(FMT, ##__VA_ARGS__); \
	297	} while (0)
	298
	299	#define _leave(FMT, ...) \
	300	do { \
	301	if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
	302	kleave(FMT, ##__VA_ARGS__); \
	303	} while (0)
	304
	305	#define _debug(FMT, ...) \
	306	do { \
	307	if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
	308	kdebug(FMT, ##__VA_ARGS__); \
	309	} while (0)
	310
	311	#else
12fdff3f DH	312	#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	313	#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	314	#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
9ae326a6 DH	315	#endif
	316
	317	#if 1 /* defined(__KDEBUGALL) */
	318
	319	#define ASSERT(X) \
	320	do { \
	321	if (unlikely(!(X))) { \
4e1eb883	322	pr_err("\n"); \
0227d6ab	323	pr_err("Assertion failed\n"); \
9ae326a6 DH	324	BUG(); \
	325	} \
	326	} while (0)
	327
	328	#define ASSERTCMP(X, OP, Y) \
	329	do { \
	330	if (unlikely(!((X) OP (Y)))) { \
4e1eb883	331	pr_err("\n"); \
0227d6ab	332	pr_err("Assertion failed\n"); \
4e1eb883	333	pr_err("%lx " #OP " %lx is false\n", \
9ae326a6 DH	334	(unsigned long)(X), (unsigned long)(Y)); \
	335	BUG(); \
	336	} \
	337	} while (0)
	338
	339	#define ASSERTIF(C, X) \
	340	do { \
	341	if (unlikely((C) && !(X))) { \
4e1eb883	342	pr_err("\n"); \
0227d6ab	343	pr_err("Assertion failed\n"); \
9ae326a6 DH	344	BUG(); \
	345	} \
	346	} while (0)
	347
	348	#define ASSERTIFCMP(C, X, OP, Y) \
	349	do { \
	350	if (unlikely((C) && !((X) OP (Y)))) { \
4e1eb883	351	pr_err("\n"); \
0227d6ab	352	pr_err("Assertion failed\n"); \
4e1eb883	353	pr_err("%lx " #OP " %lx is false\n", \
9ae326a6 DH	354	(unsigned long)(X), (unsigned long)(Y)); \
	355	BUG(); \
	356	} \
	357	} while (0)
	358
	359	#else
	360
	361	#define ASSERT(X) do {} while (0)
	362	#define ASSERTCMP(X, OP, Y) do {} while (0)
	363	#define ASSERTIF(C, X) do {} while (0)
	364	#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
	365
	366	#endif