cregit-Linux how code gets into the kernel

Release 4.12 include/linux/dcache.h

Directory: include/linux
#ifndef __LINUX_DCACHE_H

#define __LINUX_DCACHE_H

#include <linux/atomic.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/rculist_bl.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>
#include <linux/cache.h>
#include <linux/rcupdate.h>
#include <linux/lockref.h>
#include <linux/stringhash.h>
#include <linux/wait.h>

struct path;
struct vfsmount;

/*
 * linux/include/linux/dcache.h
 *
 * Dirent cache data structures
 *
 * (C) Copyright 1997 Thomas Schoebel-Theuer,
 * with heavy changes by Linus Torvalds
 */


#define IS_ROOT(x) ((x) == (x)->d_parent)

/* The hash is always the low bits of hash_len */
#ifdef __LITTLE_ENDIAN
 
#define HASH_LEN_DECLARE u32 hash; u32 len
 
#define bytemask_from_count(cnt)	(~(~0ul << (cnt)*8))
#else
 
#define HASH_LEN_DECLARE u32 len; u32 hash
 
#define bytemask_from_count(cnt)	(~(~0ul >> (cnt)*8))
#endif

/*
 * "quick string" -- eases parameter passing, but more importantly
 * saves "metadata" about the string (ie length and the hash).
 *
 * hash comes first so it snuggles against d_parent in the
 * dentry.
 */

struct qstr {
	union {
		struct {
			
HASH_LEN_DECLARE;
		};
		
u64 hash_len;
	};
	
const unsigned char *name;
};


#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }


struct dentry_stat_t {
	
long nr_dentry;
	
long nr_unused;
	
long age_limit;          /* age in seconds */
	
long want_pages;         /* pages requested by system */
	
long dummy[2];
};
extern struct dentry_stat_t dentry_stat;

/*
 * Try to keep struct dentry aligned on 64 byte cachelines (this will
 * give reasonable cacheline footprint with larger lines without the
 * large memory footprint increase).
 */
#ifdef CONFIG_64BIT

# define DNAME_INLINE_LEN 32 
/* 192 bytes */
#else
# ifdef CONFIG_SMP

#  define DNAME_INLINE_LEN 36 
/* 128 bytes */
# else

#  define DNAME_INLINE_LEN 40 
/* 128 bytes */
# endif
#endif


#define d_lock	d_lockref.lock


struct dentry {
	/* RCU lookup touched fields */
	
unsigned int d_flags;		/* protected by d_lock */
	
seqcount_t d_seq;		/* per dentry seqlock */
	
struct hlist_bl_node d_hash;	/* lookup hash list */
	
struct dentry *d_parent;	/* parent directory */
	
struct qstr d_name;
	
struct inode *d_inode;		/* Where the name belongs to - NULL is
                                         * negative */
	
unsigned char d_iname[DNAME_INLINE_LEN];	/* small names */

	/* Ref lookup also touches following */
	
struct lockref d_lockref;	/* per-dentry lock and refcount */
	
const struct dentry_operations *d_op;
	
struct super_block *d_sb;	/* The root of the dentry tree */
	
unsigned long d_time;		/* used by d_revalidate */
	
void *d_fsdata;			/* fs-specific data */

	union {
		
struct list_head d_lru;		/* LRU list */
		
wait_queue_head_t *d_wait;	/* in-lookup ones only */
	};
	
struct list_head d_child;	/* child of parent list */
	
struct list_head d_subdirs;	/* our children */
	/*
         * d_alias and d_rcu can share memory
         */
	union {
		
struct hlist_node d_alias;	/* inode alias list */
		
struct hlist_bl_node d_in_lookup_hash;	/* only for in-lookup ones */
	 	
struct rcu_head d_rcu;
	
} d_u;
};

/*
 * dentry->d_lock spinlock nesting subclasses:
 *
 * 0: normal
 * 1: nested
 */

enum dentry_d_lock_class
{
	
DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */
	
DENTRY_D_LOCK_NESTED
};


struct dentry_operations {
	
int (*d_revalidate)(struct dentry *, unsigned int);
	
int (*d_weak_revalidate)(struct dentry *, unsigned int);
	
int (*d_hash)(const struct dentry *, struct qstr *);
	
int (*d_compare)(const struct dentry *,
			unsigned int, const char *, const struct qstr *);
	
int (*d_delete)(const struct dentry *);
	
int (*d_init)(struct dentry *);
	
void (*d_release)(struct dentry *);
	
void (*d_prune)(struct dentry *);
	
void (*d_iput)(struct dentry *, struct inode *);
	
char *(*d_dname)(struct dentry *, char *, int);
	
struct vfsmount *(*d_automount)(struct path *);
	
int (*d_manage)(const struct path *, bool);
	
struct dentry *(*d_real)(struct dentry *, const struct inode *,
				 unsigned int);

} ____cacheline_aligned;

/*
 * Locking rules for dentry_operations callbacks are to be found in
 * Documentation/filesystems/Locking. Keep it updated!
 *
 * FUrther descriptions are found in Documentation/filesystems/vfs.txt.
 * Keep it updated too!
 */

/* d_flags entries */

#define DCACHE_OP_HASH			0x00000001

#define DCACHE_OP_COMPARE		0x00000002

#define DCACHE_OP_REVALIDATE		0x00000004

#define DCACHE_OP_DELETE		0x00000008

#define DCACHE_OP_PRUNE			0x00000010


#define	DCACHE_DISCONNECTED		0x00000020
     /* This dentry is possibly not currently connected to the dcache tree, in
      * which case its parent will either be itself, or will have this flag as
      * well.  nfsd will not use a dentry with this bit set, but will first
      * endeavour to clear the bit either by discovering that it is connected,
      * or by performing lookup operations.   Any filesystem which supports
      * nfsd_operations MUST have a lookup function which, if it finds a
      * directory inode with a DCACHE_DISCONNECTED dentry, will d_move that
      * dentry into place and return that dentry rather than the passed one,
      * typically using d_splice_alias. */


#define DCACHE_REFERENCED		0x00000040 
/* Recently used, don't discard. */

#define DCACHE_RCUACCESS		0x00000080 
/* Entry has ever been RCU-visible */


#define DCACHE_CANT_MOUNT		0x00000100

#define DCACHE_GENOCIDE			0x00000200

#define DCACHE_SHRINK_LIST		0x00000400


#define DCACHE_OP_WEAK_REVALIDATE	0x00000800


#define DCACHE_NFSFS_RENAMED		0x00001000
     /* this dentry has been "silly renamed" and has to be deleted on the last
      * dput() */

#define DCACHE_COOKIE			0x00002000 
/* For use by dcookie subsystem */

#define DCACHE_FSNOTIFY_PARENT_WATCHED	0x00004000
     /* Parent inode is watched by some fsnotify listener */


#define DCACHE_DENTRY_KILLED		0x00008000


#define DCACHE_MOUNTED			0x00010000 
/* is a mountpoint */

#define DCACHE_NEED_AUTOMOUNT		0x00020000 
/* handle automount on this dir */

#define DCACHE_MANAGE_TRANSIT		0x00040000 
/* manage transit from this dirent */

#define DCACHE_MANAGED_DENTRY \
	(DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)


#define DCACHE_LRU_LIST			0x00080000


#define DCACHE_ENTRY_TYPE		0x00700000

#define DCACHE_MISS_TYPE		0x00000000 
/* Negative dentry (maybe fallthru to nowhere) */

#define DCACHE_WHITEOUT_TYPE		0x00100000 
/* Whiteout dentry (stop pathwalk) */

#define DCACHE_DIRECTORY_TYPE		0x00200000 
/* Normal directory */

#define DCACHE_AUTODIR_TYPE		0x00300000 
/* Lookupless directory (presumed automount) */

#define DCACHE_REGULAR_TYPE		0x00400000 
/* Regular file type (or fallthru to such) */

#define DCACHE_SPECIAL_TYPE		0x00500000 
/* Other file type (or fallthru to such) */

#define DCACHE_SYMLINK_TYPE		0x00600000 
/* Symlink (or fallthru to such) */


#define DCACHE_MAY_FREE			0x00800000

#define DCACHE_FALLTHRU			0x01000000 
/* Fall through to lower layer */

#define DCACHE_ENCRYPTED_WITH_KEY	0x02000000 
/* dir is encrypted with a valid key */

#define DCACHE_OP_REAL			0x04000000


#define DCACHE_PAR_LOOKUP		0x10000000 
/* being looked up (with parent locked shared) */

#define DCACHE_DENTRY_CURSOR		0x20000000

extern seqlock_t rename_lock;

/*
 * These are the low-level FS interfaces to the dcache..
 */
extern void d_instantiate(struct dentry *, struct inode *);
extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
extern int d_instantiate_no_diralias(struct dentry *, struct inode *);
extern void __d_drop(struct dentry *dentry);
extern void d_drop(struct dentry *dentry);
extern void d_delete(struct dentry *);
extern void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op);

/* allocate/de-allocate */
extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *,
					wait_queue_head_t *);
extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
extern struct dentry * d_exact_alias(struct dentry *, struct inode *);
extern struct dentry *d_find_any_alias(struct inode *inode);
extern struct dentry * d_obtain_alias(struct inode *);
extern struct dentry * d_obtain_root(struct inode *);
extern void shrink_dcache_sb(struct super_block *);
extern void shrink_dcache_parent(struct dentry *);
extern void shrink_dcache_for_umount(struct super_block *);
extern void d_invalidate(struct dentry *);

/* only used at mount-time */
extern struct dentry * d_make_root(struct inode *);

/* <clickety>-<click> the ramfs-type tree */
extern void d_genocide(struct dentry *);

extern void d_tmpfile(struct dentry *, struct inode *);

extern struct dentry *d_find_alias(struct inode *);
extern void d_prune_aliases(struct inode *);

/* test whether we have any submounts in a subdir tree */
extern int path_has_submounts(const struct path *);

/*
 * This adds the entry to the hash queues.
 */
extern void d_rehash(struct dentry *);
 
extern void d_add(struct dentry *, struct inode *);

extern void dentry_update_name_case(struct dentry *, const struct qstr *);

/* used for rename() and baskets */
extern void d_move(struct dentry *, struct dentry *);
extern void d_exchange(struct dentry *, struct dentry *);
extern struct dentry *d_ancestor(struct dentry *, struct dentry *);

/* appendix may either be NULL or be used for transname suffixes */
extern struct dentry *d_lookup(const struct dentry *, const struct qstr *);
extern struct dentry *d_hash_and_lookup(struct dentry *, struct qstr *);
extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
				const struct qstr *name, unsigned *seq);


static inline unsigned d_count(const struct dentry *dentry) { return dentry->d_lockref.count; }

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Al Viro1680.00%133.33%
Waiman Long315.00%133.33%
Peng Tao15.00%133.33%
Total20100.00%3100.00%

/* * helper function for dentry_operations.d_dname() members */ extern __printf(4, 5) char *dynamic_dname(struct dentry *, char *, int, const char *, ...); extern char *simple_dname(struct dentry *, char *, int); extern char *__d_path(const struct path *, const struct path *, char *, int); extern char *d_absolute_path(const struct path *, char *, int); extern char *d_path(const struct path *, char *, int); extern char *dentry_path_raw(struct dentry *, char *, int); extern char *dentry_path(struct dentry *, char *, int); /* Allocation counts.. */ /** * dget, dget_dlock - get a reference to a dentry * @dentry: dentry to get a reference to * * Given a dentry or %NULL pointer increment the reference count * if appropriate and return the dentry. A dentry will not be * destroyed when it has references. */
static inline struct dentry *dget_dlock(struct dentry *dentry) { if (dentry) dentry->d_lockref.count++; return dentry; }

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Nicholas Piggin932.14%120.00%
Andrew Morton932.14%120.00%
Linus Torvalds (pre-git)725.00%240.00%
Waiman Long310.71%120.00%
Total28100.00%5100.00%


static inline struct dentry *dget(struct dentry *dentry) { if (dentry) lockref_get(&dentry->d_lockref); return dentry; }

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Nicholas Piggin1862.07%120.00%
Andrew Morton620.69%240.00%
Linus Torvalds (pre-git)310.34%120.00%
Waiman Long26.90%120.00%
Total29100.00%5100.00%

extern struct dentry *dget_parent(struct dentry *dentry); /** * d_unhashed - is dentry hashed * @dentry: entry to check * * Returns true if the dentry passed is not currently hashed. */
static inline int d_unhashed(const struct dentry *dentry) { return hlist_bl_unhashed(&dentry->d_hash); }

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Linus Torvalds (pre-git)1568.18%240.00%
Linus Torvalds522.73%120.00%
Andrew Morton14.55%120.00%
Al Viro14.55%120.00%
Total22100.00%5100.00%


static inline int d_unlinked(const struct dentry *dentry) { return d_unhashed(dentry) && !IS_ROOT(dentry); }

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Alexey Dobriyan2496.00%150.00%
Al Viro14.00%150.00%
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static inline int cant_mount(const struct dentry *dentry) { return (dentry->d_flags & DCACHE_CANT_MOUNT); }

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static inline void dont_mount(struct dentry *dentry) { spin_lock(&dentry->d_lock); dentry->d_flags |= DCACHE_CANT_MOUNT; spin_unlock(&dentry->d_lock); }

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extern void __d_lookup_done(struct dentry *);
static inline int d_in_lookup(struct dentry *dentry) { return dentry->d_flags & DCACHE_PAR_LOOKUP; }

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static inline void d_lookup_done(struct dentry *dentry) { if (unlikely(d_in_lookup(dentry))) { spin_lock(&dentry->d_lock); __d_lookup_done(dentry); spin_unlock(&dentry->d_lock); } }

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extern void dput(struct dentry *);
static inline bool d_managed(const struct dentry *dentry) { return dentry->d_flags & DCACHE_MANAGED_DENTRY; }

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David Howells1995.00%150.00%
Al Viro15.00%150.00%
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static inline bool d_mountpoint(const struct dentry *dentry) { return dentry->d_flags & DCACHE_MOUNTED; }

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Linus Torvalds (pre-git)1470.00%120.00%
Nicholas Piggin315.00%120.00%
Al Viro15.00%120.00%
David Howells15.00%120.00%
Andrew Morton15.00%120.00%
Total20100.00%5100.00%

/* * Directory cache entry type accessor functions. */
static inline unsigned __d_entry_type(const struct dentry *dentry) { return dentry->d_flags & DCACHE_ENTRY_TYPE; }

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David Howells1995.00%266.67%
Al Viro15.00%133.33%
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static inline bool d_is_miss(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_MISS_TYPE; }

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static inline bool d_is_whiteout(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_WHITEOUT_TYPE; }

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static inline bool d_can_lookup(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE; }

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Miklos Szeredi14.76%150.00%
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static inline bool d_is_autodir(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE; }

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static inline bool d_is_dir(const struct dentry *dentry) { return d_can_lookup(dentry) || d_is_autodir(dentry); }

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Miklos Szeredi24100.00%1100.00%
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static inline bool d_is_symlink(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE; }

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David Howells21100.00%1100.00%
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static inline bool d_is_reg(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_REGULAR_TYPE; }

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static inline bool d_is_special(const struct dentry *dentry) { return __d_entry_type(dentry) == DCACHE_SPECIAL_TYPE; }

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static inline bool d_is_file(const struct dentry *dentry) { return d_is_reg(dentry) || d_is_special(dentry); }

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static inline bool d_is_negative(const struct dentry *dentry) { // TODO: check d_is_whiteout(dentry) also. return d_is_miss(dentry); }

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static inline bool d_is_positive(const struct dentry *dentry) { return !d_is_negative(dentry); }

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David Howells20100.00%1100.00%
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/** * d_really_is_negative - Determine if a dentry is really negative (ignoring fallthroughs) * @dentry: The dentry in question * * Returns true if the dentry represents either an absent name or a name that * doesn't map to an inode (ie. ->d_inode is NULL). The dentry could represent * a true miss, a whiteout that isn't represented by a 0,0 chardev or a * fallthrough marker in an opaque directory. * * Note! (1) This should be used *only* by a filesystem to examine its own * dentries. It should not be used to look at some other filesystem's * dentries. (2) It should also be used in combination with d_inode() to get * the inode. (3) The dentry may have something attached to ->d_lower and the * type field of the flags may be set to something other than miss or whiteout. */
static inline bool d_really_is_negative(const struct dentry *dentry) { return dentry->d_inode == NULL; }

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David Howells20100.00%1100.00%
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/** * d_really_is_positive - Determine if a dentry is really positive (ignoring fallthroughs) * @dentry: The dentry in question * * Returns true if the dentry represents a name that maps to an inode * (ie. ->d_inode is not NULL). The dentry might still represent a whiteout if * that is represented on medium as a 0,0 chardev. * * Note! (1) This should be used *only* by a filesystem to examine its own * dentries. It should not be used to look at some other filesystem's * dentries. (2) It should also be used in combination with d_inode() to get * the inode. */
static inline bool d_really_is_positive(const struct dentry *dentry) { return dentry->d_inode != NULL; }

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static inline int simple_positive(struct dentry *dentry) { return d_really_is_positive(dentry) && !d_unhashed(dentry); }

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Al Viro24100.00%1100.00%
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extern void d_set_fallthru(struct dentry *dentry);
static inline bool d_is_fallthru(const struct dentry *dentry) { return dentry->d_flags & DCACHE_FALLTHRU; }

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extern int sysctl_vfs_cache_pressure;
static inline unsigned long vfs_pressure_ratio(unsigned long val) { return mult_frac(val, sysctl_vfs_cache_pressure, 100); }

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Glauber de Oliveira Costa22100.00%1100.00%
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/** * d_inode - Get the actual inode of this dentry * @dentry: The dentry to query * * This is the helper normal filesystems should use to get at their own inodes * in their own dentries and ignore the layering superimposed upon them. */
static inline struct inode *d_inode(const struct dentry *dentry) { return dentry->d_inode; }

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David Howells20100.00%1100.00%
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/** * d_inode_rcu - Get the actual inode of this dentry with ACCESS_ONCE() * @dentry: The dentry to query * * This is the helper normal filesystems should use to get at their own inodes * in their own dentries and ignore the layering superimposed upon them. */
static inline struct inode *d_inode_rcu(const struct dentry *dentry) { return ACCESS_ONCE(dentry->d_inode); }

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David Howells23100.00%1100.00%
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/** * d_backing_inode - Get upper or lower inode we should be using * @upper: The upper layer * * This is the helper that should be used to get at the inode that will be used * if this dentry were to be opened as a file. The inode may be on the upper * dentry or it may be on a lower dentry pinned by the upper. * * Normal filesystems should not use this to access their own inodes. */
static inline struct inode *d_backing_inode(const struct dentry *upper) { struct inode *inode = upper->d_inode; return inode; }

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David Howells27100.00%1100.00%
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/** * d_backing_dentry - Get upper or lower dentry we should be using * @upper: The upper layer * * This is the helper that should be used to get the dentry of the inode that * will be used if this dentry were opened as a file. It may be the upper * dentry or it may be a lower dentry pinned by the upper. * * Normal filesystems should not use this to access their own dentries. */
static inline struct dentry *d_backing_dentry(struct dentry *upper) { return upper; }

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David Howells17100.00%1100.00%
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/** * d_real - Return the real dentry * @dentry: the dentry to query * @inode: inode to select the dentry from multiple layers (can be NULL) * @flags: open flags to control copy-up behavior * * If dentry is on a union/overlay, then return the underlying, real dentry. * Otherwise return the dentry itself. * * See also: Documentation/filesystems/vfs.txt */
static inline struct dentry *d_real(struct dentry *dentry, const struct inode *inode, unsigned int flags) { if (unlikely(dentry->d_flags & DCACHE_OP_REAL)) return dentry->d_op->d_real(dentry, inode, flags); else return dentry; }

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Miklos Szeredi53100.00%2100.00%
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/** * d_real_inode - Return the real inode * @dentry: The dentry to query * * If dentry is on a union/overlay, then return the underlying, real inode. * Otherwise return d_inode(). */
static inline struct inode *d_real_inode(const struct dentry *dentry) { /* This usage of d_real() results in const dentry */ return d_backing_inode(d_real((struct dentry *) dentry, NULL, 0)); }

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#endif /* __LINUX_DCACHE_H */

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David Howells53024.66%117.28%
Linus Torvalds (pre-git)37017.22%3321.85%
Al Viro32615.17%2415.89%
Nicholas Piggin23110.75%1711.26%
Miklos Szeredi2019.35%117.28%
Linus Torvalds864.00%63.97%
Andrew Morton602.79%95.96%
Eric Dumazet421.95%21.32%
Glauber de Oliveira Costa271.26%21.32%
Alexey Dobriyan241.12%10.66%
Sage Weil221.02%21.32%
Waiman Long190.88%10.66%
Christoph Hellwig190.88%31.99%
Barry Naujok180.84%10.66%
Jeff Layton170.79%10.66%
Neil Brown150.70%10.66%
Hirofumi Ogawa150.70%10.66%
Eric W. Biedermann150.70%21.32%
Ram Pai150.70%10.66%
Will Deacon140.65%10.66%
Trond Myklebust140.65%10.66%
Ingo Molnar130.60%21.32%
J. Bruce Fields110.51%10.66%
Ian Kent100.47%21.32%
Nicolas Iooss40.19%10.66%
Jaegeuk Kim40.19%10.66%
David S. Miller40.19%10.66%
Jan Blunck40.19%10.66%
Franck Bui-Huu30.14%10.66%
George Spelvin30.14%10.66%
Richard Henderson30.14%10.66%
Masahiro Yamada20.09%10.66%
Jeff Garzik20.09%10.66%
Matthew Wilcox10.05%10.66%
Anton Blanchard10.05%10.66%
Peng Tao10.05%10.66%
Arun Sharma10.05%10.66%
Dipankar Sarma10.05%10.66%
Jan Engelhardt10.05%10.66%
Total2149100.00%151100.00%
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