82 struct dentry {  struct
87 	struct dentry *d_parent;	/* parent directory */  argument
129 	int (*d_revalidate)(struct dentry *, unsigned int);
130 	int (*d_weak_revalidate)(struct dentry *, unsigned int);
131 	int (*d_hash)(const struct dentry *, struct qstr *);
132 	int (*d_compare)(const struct dentry *,
134 	int (*d_delete)(const struct dentry *);
135 	int (*d_init)(struct dentry *);
136 	void (*d_release)(struct dentry *);
137 	void (*d_prune)(struct dentry *);
138 	void (*d_iput)(struct dentry *, struct inode *);
139 	char *(*d_dname)(struct dentry *, char *, int);
142 	struct dentry *(*d_real)(struct dentry *, const struct inode *);
221 extern void d_instantiate(struct dentry *, struct inode *);
222 extern void d_instantiate_new(struct dentry *, struct inode *);
223 extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
224 extern struct dentry * d_instantiate_anon(struct dentry *, struct inode *);
225 extern void __d_drop(struct dentry *dentry);
226 extern void d_drop(struct dentry *dentry);
227 extern void d_delete(struct dentry *);
228 extern void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op);
231 extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
232 extern struct dentry * d_alloc_anon(struct super_block *);
233 extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *,
235 extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
236 extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
237 extern bool d_same_name(const struct dentry *dentry, const struct dentry *parent,
239 extern struct dentry * d_exact_alias(struct dentry *, struct inode *);
240 extern struct dentry *d_find_any_alias(struct inode *inode);
241 extern struct dentry * d_obtain_alias(struct inode *);
242 extern struct dentry * d_obtain_root(struct inode *);
244 extern void shrink_dcache_parent(struct dentry *);
246 extern void d_invalidate(struct dentry *);
249 extern struct dentry * d_make_root(struct inode *);
252 extern void d_genocide(struct dentry *);
256 extern struct dentry *d_find_alias(struct inode *);
259 extern struct dentry *d_find_alias_rcu(struct inode *);
267 extern void d_rehash(struct dentry *);
269 extern void d_add(struct dentry *, struct inode *);
272 extern void d_move(struct dentry *, struct dentry *);
273 extern void d_exchange(struct dentry *, struct dentry *);
274 extern struct dentry *d_ancestor(struct dentry *, struct dentry *);
277 extern struct dentry *d_lookup(const struct dentry *, const struct qstr *);
278 extern struct dentry *d_hash_and_lookup(struct dentry *, struct qstr *);
279 extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
280 extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
283 static inline unsigned d_count(const struct dentry *dentry)  in d_count()  argument
285 	return dentry->d_lockref.count;  in d_count()
297 extern char *dentry_path_raw(const struct dentry *, char *, int);
298 extern char *dentry_path(const struct dentry *, char *, int);
310 static inline struct dentry *dget_dlock(struct dentry *dentry)  in dget_dlock()  argument
312 	if (dentry)  in dget_dlock()
313 		dentry->d_lockref.count++;  in dget_dlock()
314 	return dentry;  in dget_dlock()
317 static inline struct dentry *dget(struct dentry *dentry)  in dget()  argument
319 	if (dentry)  in dget()
320 		lockref_get(&dentry->d_lockref);  in dget()
321 	return dentry;  in dget()
324 extern struct dentry *dget_parent(struct dentry *dentry);
333 static inline int d_unhashed(const struct dentry *dentry)  in d_unhashed()  argument
335 	return hlist_bl_unhashed(&dentry->d_hash);  in d_unhashed()
338 static inline int d_unlinked(const struct dentry *dentry)  in d_unlinked()  argument
340 	return d_unhashed(dentry) && !IS_ROOT(dentry);  in d_unlinked()
343 static inline int cant_mount(const struct dentry *dentry)  in cant_mount()  argument
345 	return (dentry->d_flags & DCACHE_CANT_MOUNT);  in cant_mount()
348 static inline void dont_mount(struct dentry *dentry)  in dont_mount()  argument
350 	spin_lock(&dentry->d_lock);  in dont_mount()
351 	dentry->d_flags |= DCACHE_CANT_MOUNT;  in dont_mount()
352 	spin_unlock(&dentry->d_lock);  in dont_mount()
355 extern void __d_lookup_unhash_wake(struct dentry *dentry);
357 static inline int d_in_lookup(const struct dentry *dentry)  in d_in_lookup()  argument
359 	return dentry->d_flags & DCACHE_PAR_LOOKUP;  in d_in_lookup()
362 static inline void d_lookup_done(struct dentry *dentry)  in d_lookup_done()  argument
364 	if (unlikely(d_in_lookup(dentry)))  in d_lookup_done()
365 		__d_lookup_unhash_wake(dentry);  in d_lookup_done()
368 extern void dput(struct dentry *);
370 static inline bool d_managed(const struct dentry *dentry)  in d_managed()  argument
372 	return dentry->d_flags & DCACHE_MANAGED_DENTRY;  in d_managed()
375 static inline bool d_mountpoint(const struct dentry *dentry)  in d_mountpoint()  argument
377 	return dentry->d_flags & DCACHE_MOUNTED;  in d_mountpoint()
383 static inline unsigned __d_entry_type(const struct dentry *dentry)  in __d_entry_type()  argument
385 	return dentry->d_flags & DCACHE_ENTRY_TYPE;  in __d_entry_type()
388 static inline bool d_is_miss(const struct dentry *dentry)  in d_is_miss()  argument
390 	return __d_entry_type(dentry) == DCACHE_MISS_TYPE;  in d_is_miss()
393 static inline bool d_is_whiteout(const struct dentry *dentry)  in d_is_whiteout()  argument
395 	return __d_entry_type(dentry) == DCACHE_WHITEOUT_TYPE;  in d_is_whiteout()
398 static inline bool d_can_lookup(const struct dentry *dentry)  in d_can_lookup()  argument
400 	return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;  in d_can_lookup()
403 static inline bool d_is_autodir(const struct dentry *dentry)  in d_is_autodir()  argument
405 	return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE;  in d_is_autodir()
408 static inline bool d_is_dir(const struct dentry *dentry)  in d_is_dir()  argument
410 	return d_can_lookup(dentry) || d_is_autodir(dentry);  in d_is_dir()
413 static inline bool d_is_symlink(const struct dentry *dentry)  in d_is_symlink()  argument
415 	return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;  in d_is_symlink()
418 static inline bool d_is_reg(const struct dentry *dentry)  in d_is_reg()  argument
420 	return __d_entry_type(dentry) == DCACHE_REGULAR_TYPE;  in d_is_reg()
423 static inline bool d_is_special(const struct dentry *dentry)  in d_is_special()  argument
425 	return __d_entry_type(dentry) == DCACHE_SPECIAL_TYPE;  in d_is_special()
428 static inline bool d_is_file(const struct dentry *dentry)  in d_is_file()  argument
430 	return d_is_reg(dentry) || d_is_special(dentry);  in d_is_file()
433 static inline bool d_is_negative(const struct dentry *dentry)  in d_is_negative()  argument
436 	return d_is_miss(dentry);  in d_is_negative()
444 static inline bool d_is_positive(const struct dentry *dentry)  in d_is_positive()  argument
446 	return !d_is_negative(dentry);  in d_is_positive()
464 static inline bool d_really_is_negative(const struct dentry *dentry)  in d_really_is_negative()  argument
466 	return dentry->d_inode == NULL;  in d_really_is_negative()
482 static inline bool d_really_is_positive(const struct dentry *dentry)  in d_really_is_positive()  argument
484 	return dentry->d_inode != NULL;  in d_really_is_positive()
487 static inline int simple_positive(const struct dentry *dentry)  in simple_positive()  argument
489 	return d_really_is_positive(dentry) && !d_unhashed(dentry);  in simple_positive()
492 extern void d_set_fallthru(struct dentry *dentry);
494 static inline bool d_is_fallthru(const struct dentry *dentry)  in d_is_fallthru()  argument
496 	return dentry->d_flags & DCACHE_FALLTHRU;  in d_is_fallthru()
514 static inline struct inode *d_inode(const struct dentry *dentry)  in d_inode()  argument
516 	return dentry->d_inode;  in d_inode()
526 static inline struct inode *d_inode_rcu(const struct dentry *dentry)  in d_inode_rcu()  argument
528 	return READ_ONCE(dentry->d_inode);  in d_inode_rcu()
541 static inline struct inode *d_backing_inode(const struct dentry *upper)  in d_backing_inode()
558 static inline struct dentry *d_backing_dentry(struct dentry *upper)  in d_backing_dentry()
573 static inline struct dentry *d_real(struct dentry *dentry,  in d_real()  argument
576 	if (unlikely(dentry->d_flags & DCACHE_OP_REAL))  in d_real()
577 		return dentry->d_op->d_real(dentry, inode);  in d_real()
579 		return dentry;  in d_real()
589 static inline struct inode *d_real_inode(const struct dentry *dentry)  in d_real_inode()  argument
592 	return d_backing_inode(d_real((struct dentry *) dentry, NULL));  in d_real_inode()
599 void take_dentry_name_snapshot(struct name_snapshot *, struct dentry *);