[mirror_ubuntu-artful-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.
 */

#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_bit.h>
#include <linux/cred.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_entry_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,
					    blkcnt_t i_blocks);
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>
9ae326a6 DH	20	#include <linux/timer.h>
5dd43ce2	21	#include <linux/wait_bit.h>
5b825c3a	22	#include <linux/cred.h>
9ae326a6 DH	23	#include <linux/workqueue.h>
	24	#include <linux/security.h>
	25
	26	struct cachefiles_cache;
	27	struct cachefiles_object;
	28
	29	extern unsigned cachefiles_debug;
	30	#define CACHEFILES_DEBUG_KENTER 1
	31	#define CACHEFILES_DEBUG_KLEAVE 2
	32	#define CACHEFILES_DEBUG_KDEBUG 4
	33
71baba4b	34	#define cachefiles_gfp (__GFP_RECLAIM \| __GFP_NORETRY \| __GFP_NOMEMALLOC)
5f4f9f4a	35
9ae326a6 DH	36	/*
	37	* node records
	38	*/
	39	struct cachefiles_object {
	40	struct fscache_object fscache; /* fscache handle */
	41	struct cachefiles_lookup_data lookup_data; / cached lookup data */
	42	struct dentry dentry; / the file/dir representing this object */
	43	struct dentry backer; / backing file */
	44	loff_t i_size; /* object size */
	45	unsigned long flags;
	46	#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
	47	atomic_t usage; /* object usage count */
	48	uint8_t type; /* object type */
	49	uint8_t new; /* T if object new */
	50	spinlock_t work_lock;
	51	struct rb_node active_node; /* link in active tree (dentry is key) */
	52	};
	53
	54	extern struct kmem_cache *cachefiles_object_jar;
	55
	56	/*
	57	* Cache files cache definition
	58	*/
	59	struct cachefiles_cache {
	60	struct fscache_cache cache; /* FS-Cache record */
	61	struct vfsmount mnt; / mountpoint holding the cache */
	62	struct dentry graveyard; / directory into which dead objects go */
	63	struct file cachefilesd; / manager daemon handle */
	64	const struct cred cache_cred; / security override for accessing cache */
	65	struct mutex daemon_mutex; /* command serialisation mutex */
	66	wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
	67	struct rb_root active_nodes; /* active nodes (can't be culled) */
	68	rwlock_t active_lock; /* lock for active_nodes */
	69	atomic_t gravecounter; /* graveyard uniquifier */
a5b3a80b DH	70	atomic_t f_released; /* number of objects released lately */
a5b3a80b DH	71	atomic_long_t b_released; /* number of blocks released lately */
9ae326a6 DH	72	unsigned frun_percent; /* when to stop culling (% files) */
	73	unsigned fcull_percent; /* when to start culling (% files) */
	74	unsigned fstop_percent; /* when to stop allocating (% files) */
	75	unsigned brun_percent; /* when to stop culling (% blocks) */
	76	unsigned bcull_percent; /* when to start culling (% blocks) */
	77	unsigned bstop_percent; /* when to stop allocating (% blocks) */
	78	unsigned bsize; /* cache's block size */
	79	unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
	80	uint64_t frun; /* when to stop culling */
	81	uint64_t fcull; /* when to start culling */
	82	uint64_t fstop; /* when to stop allocating */
	83	sector_t brun; /* when to stop culling */
	84	sector_t bcull; /* when to start culling */
	85	sector_t bstop; /* when to stop allocating */
	86	unsigned long flags;
	87	#define CACHEFILES_READY 0 /* T if cache prepared */
	88	#define CACHEFILES_DEAD 1 /* T if cache dead */
	89	#define CACHEFILES_CULLING 2 /* T if cull engaged */
	90	#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
	91	char rootdirname; / name of cache root directory */
	92	char secctx; / LSM security context */
	93	char tag; / cache binding tag */
	94	};
	95
	96	/*
	97	* backing file read tracking
	98	*/
	99	struct cachefiles_one_read {
ac6424b9	100	wait_queue_entry_t monitor; /* link into monitored waitqueue */
9ae326a6 DH	101	struct page back_page; / backing file page we're waiting for */
	102	struct page netfs_page; / netfs page we're going to fill */
	103	struct fscache_retrieval op; / retrieval op covering this */
	104	struct list_head op_link; /* link in op's todo list */
	105	};
	106
	107	/*
	108	* backing file write tracking
	109	*/
	110	struct cachefiles_one_write {
	111	struct page netfs_page; / netfs page to copy */
	112	struct cachefiles_object *object;
	113	struct list_head obj_link; /* link in object's lists */
	114	fscache_rw_complete_t end_io_func;
	115	void *context;
	116	};
	117
	118	/*
	119	* auxiliary data xattr buffer
	120	*/
	121	struct cachefiles_xattr {
	122	uint16_t len;
	123	uint8_t type;
	124	uint8_t data[];
	125	};
	126
	127	/*
	128	* note change of state for daemon
	129	*/
	130	static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
	131	{
	132	set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
	133	wake_up_all(&cache->daemon_pollwq);
	134	}
	135
	136	/*
911e690e	137	* bind.c
9ae326a6 DH	138	*/
	139	extern int cachefiles_daemon_bind(struct cachefiles_cache cache, char args);
	140	extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
	141
	142	/*
911e690e	143	* daemon.c
9ae326a6 DH	144	*/
	145	extern const struct file_operations cachefiles_daemon_fops;
	146
	147	extern int cachefiles_has_space(struct cachefiles_cache *cache,
	148	unsigned fnr, unsigned bnr);
	149
	150	/*
911e690e	151	* interface.c
9ae326a6 DH	152	*/
	153	extern const struct fscache_cache_ops cachefiles_cache_ops;
	154
	155	/*
911e690e	156	* key.c
9ae326a6 DH	157	*/
	158	extern char cachefiles_cook_key(const u8 raw, int keylen, uint8_t type);
	159
	160	/*
911e690e	161	* namei.c
9ae326a6	162	*/
a5b3a80b	163	extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
a818101d DH	164	struct cachefiles_object *object,
a818101d DH	165	blkcnt_t i_blocks);
9ae326a6 DH	166	extern int cachefiles_delete_object(struct cachefiles_cache *cache,
	167	struct cachefiles_object *object);
	168	extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
	169	struct cachefiles_object *object,
	170	const char *key,
	171	struct cachefiles_xattr *auxdata);
	172	extern struct dentry cachefiles_get_directory(struct cachefiles_cache cache,
	173	struct dentry *dir,
	174	const char *name);
	175
	176	extern int cachefiles_cull(struct cachefiles_cache cache, struct dentry dir,
	177	char *filename);
	178
	179	extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
	180	struct dentry dir, char filename);
	181
	182	/*
911e690e	183	* proc.c
9ae326a6 DH	184	*/
	185	#ifdef CONFIG_CACHEFILES_HISTOGRAM
	186	extern atomic_t cachefiles_lookup_histogram[HZ];
	187	extern atomic_t cachefiles_mkdir_histogram[HZ];
	188	extern atomic_t cachefiles_create_histogram[HZ];
	189
	190	extern int __init cachefiles_proc_init(void);
	191	extern void cachefiles_proc_cleanup(void);
	192	static inline
	193	void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
	194	{
	195	unsigned long jif = jiffies - start_jif;
	196	if (jif >= HZ)
	197	jif = HZ - 1;
	198	atomic_inc(&histogram[jif]);
	199	}
	200
	201	#else
	202	#define cachefiles_proc_init() (0)
	203	#define cachefiles_proc_cleanup() do {} while (0)
	204	#define cachefiles_hist(hist, start_jif) do {} while (0)
	205	#endif
	206
	207	/*
911e690e	208	* rdwr.c
9ae326a6 DH	209	*/
	210	extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
	211	struct page *, gfp_t);
	212	extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
	213	struct list_head , unsigned ,
	214	gfp_t);
	215	extern int cachefiles_allocate_page(struct fscache_retrieval , struct page ,
	216	gfp_t);
	217	extern int cachefiles_allocate_pages(struct fscache_retrieval *,
	218	struct list_head , unsigned , gfp_t);
	219	extern int cachefiles_write_page(struct fscache_storage , struct page );
	220	extern void cachefiles_uncache_page(struct fscache_object , struct page );
	221
	222	/*
911e690e	223	* security.c
9ae326a6 DH	224	*/
	225	extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
	226	extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
	227	struct dentry *root,
	228	const struct cred **_saved_cred);
	229
	230	static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
	231	const struct cred **_saved_cred)
	232	{
	233	*_saved_cred = override_creds(cache->cache_cred);
	234	}
	235
	236	static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
	237	const struct cred *saved_cred)
	238	{
	239	revert_creds(saved_cred);
	240	}
	241
	242	/*
911e690e	243	* xattr.c
9ae326a6 DH	244	*/
	245	extern int cachefiles_check_object_type(struct cachefiles_object *object);
	246	extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
	247	struct cachefiles_xattr *auxdata);
	248	extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
	249	struct cachefiles_xattr *auxdata);
5002d7be	250	extern int cachefiles_check_auxdata(struct cachefiles_object *object);
9ae326a6 DH	251	extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
	252	struct cachefiles_xattr *auxdata);
	253	extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
	254	struct dentry *dentry);
	255
	256
	257	/*
	258	* error handling
	259	*/
9ae326a6 DH	260
	261	#define cachefiles_io_error(___cache, FMT, ...) \
	262	do { \
6ff66ac7	263	pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
9ae326a6 DH	264	fscache_io_error(&(___cache)->cache); \
	265	set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
	266	} while (0)
	267
	268	#define cachefiles_io_error_obj(object, FMT, ...) \
	269	do { \
	270	struct cachefiles_cache *___cache; \
	271	\
	272	___cache = container_of((object)->fscache.cache, \
	273	struct cachefiles_cache, cache); \
	274	cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
	275	} while (0)
	276
	277
	278	/*
	279	* debug tracing
	280	*/
	281	#define dbgprintk(FMT, ...) \
	282	printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
	283
9ae326a6 DH	284	#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	285	#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	286	#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
	287
	288
	289	#if defined(__KDEBUG)
	290	#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
	291	#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
	292	#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
	293
	294	#elif defined(CONFIG_CACHEFILES_DEBUG)
	295	#define _enter(FMT, ...) \
	296	do { \
	297	if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
	298	kenter(FMT, ##__VA_ARGS__); \
	299	} while (0)
	300
	301	#define _leave(FMT, ...) \
	302	do { \
	303	if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
	304	kleave(FMT, ##__VA_ARGS__); \
	305	} while (0)
	306
	307	#define _debug(FMT, ...) \
	308	do { \
	309	if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
	310	kdebug(FMT, ##__VA_ARGS__); \
	311	} while (0)
	312
	313	#else
12fdff3f DH	314	#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
	315	#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
	316	#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
9ae326a6 DH	317	#endif
	318
	319	#if 1 /* defined(__KDEBUGALL) */
	320
	321	#define ASSERT(X) \
	322	do { \
	323	if (unlikely(!(X))) { \
4e1eb883	324	pr_err("\n"); \
0227d6ab	325	pr_err("Assertion failed\n"); \
9ae326a6 DH	326	BUG(); \
	327	} \
	328	} while (0)
	329
	330	#define ASSERTCMP(X, OP, Y) \
	331	do { \
	332	if (unlikely(!((X) OP (Y)))) { \
4e1eb883	333	pr_err("\n"); \
0227d6ab	334	pr_err("Assertion failed\n"); \
4e1eb883	335	pr_err("%lx " #OP " %lx is false\n", \
9ae326a6 DH	336	(unsigned long)(X), (unsigned long)(Y)); \
	337	BUG(); \
	338	} \
	339	} while (0)
	340
	341	#define ASSERTIF(C, X) \
	342	do { \
	343	if (unlikely((C) && !(X))) { \
4e1eb883	344	pr_err("\n"); \
0227d6ab	345	pr_err("Assertion failed\n"); \
9ae326a6 DH	346	BUG(); \
	347	} \
	348	} while (0)
	349
	350	#define ASSERTIFCMP(C, X, OP, Y) \
	351	do { \
	352	if (unlikely((C) && !((X) OP (Y)))) { \
4e1eb883	353	pr_err("\n"); \
0227d6ab	354	pr_err("Assertion failed\n"); \
4e1eb883	355	pr_err("%lx " #OP " %lx is false\n", \
9ae326a6 DH	356	(unsigned long)(X), (unsigned long)(Y)); \
	357	BUG(); \
	358	} \
	359	} while (0)
	360
	361	#else
	362
	363	#define ASSERT(X) do {} while (0)
	364	#define ASSERTCMP(X, OP, Y) do {} while (0)
	365	#define ASSERTIF(C, X) do {} while (0)
	366	#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
	367
	368	#endif