Release 4.15 include/linux/namei.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_NAMEI_H

#define _LINUX_NAMEI_H

#include <linux/kernel.h>
#include <linux/path.h>
#include <linux/fcntl.h>
#include <linux/errno.h>


enum { MAX_NESTED_LINKS = 8 };


#define MAXSYMLINKS 40

/*
 * Type of the last component on LOOKUP_PARENT
 */





enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};

/*
 * The bitmask for a lookup event:
 *  - follow links at the end
 *  - require a directory
 *  - ending slashes ok even for nonexistent files
 *  - internal "there are more path components" flag
 *  - dentry cache is untrusted; force a real lookup
 *  - suppress terminal automount
 */

#define LOOKUP_FOLLOW		0x0001

#define LOOKUP_DIRECTORY	0x0002

#define LOOKUP_AUTOMOUNT	0x0004


#define LOOKUP_PARENT		0x0010

#define LOOKUP_REVAL		0x0020

#define LOOKUP_RCU		0x0040

#define LOOKUP_NO_REVAL		0x0080

/*
 * Intent data
 */

#define LOOKUP_OPEN		0x0100

#define LOOKUP_CREATE		0x0200

#define LOOKUP_EXCL		0x0400

#define LOOKUP_RENAME_TARGET	0x0800


#define LOOKUP_JUMPED		0x1000

#define LOOKUP_ROOT		0x2000

#define LOOKUP_EMPTY		0x4000

#define LOOKUP_DOWN		0x8000

extern int path_pts(struct path *path);

extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);



static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
		 struct path *path)
{
	return user_path_at_empty(dfd, name, flags, path, NULL);
}

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static inline int user_path(const char __user *name, struct path *path)
{
	return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
}

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static inline int user_lpath(const char __user *name, struct path *path)
{
	return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
}

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static inline int user_path_dir(const char __user *name, struct path *path)
{
	return user_path_at_empty(AT_FDCWD, name,
				  LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL);
}

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extern int kern_path(const char *, unsigned, struct path *);

extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
extern void done_path_create(struct path *, struct dentry *);
extern struct dentry *kern_path_locked(const char *, struct path *);
extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);

extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);

extern int follow_down_one(struct path *);
extern int follow_down(struct path *);
extern int follow_up(struct path *);

extern struct dentry *lock_rename(struct dentry *, struct dentry *);
extern void unlock_rename(struct dentry *, struct dentry *);

extern void nd_jump_link(struct path *path);



static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
{
	((char *) name)[min(len, maxlen)] = '\0';
}

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/**
 * retry_estale - determine whether the caller should retry an operation
 * @error: the error that would currently be returned
 * @flags: flags being used for next lookup attempt
 *
 * Check to see if the error code was -ESTALE, and then determine whether
 * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
 *
 * Returns true if the caller should try the operation again.
 */

static inline bool

retry_estale(const long error, const unsigned int flags)
{
	return error == -ESTALE && !(flags & LOOKUP_REVAL);
}

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#endif /* _LINUX_NAMEI_H */
Overall Contributors
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Al Viro
250
46.04%
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43.90%
Christoph Hellwig
115
21.18%
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4.88%
Duane Griffin
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6.45%
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2.44%
Jeff Layton
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Harvey Harrison
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Neil Brown
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Andy Whitcroft
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2.76%
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Trond Myklebust
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David Howells
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Eric W. Biedermann
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Nicholas Piggin
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Hirofumi Ogawa
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Linus Torvalds
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Stephen Warren
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Jan Blunck
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Alexey Dobriyan
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David S. Miller
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Josef 'Jeff' Sipek
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Greg Kroah-Hartman
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Directory: include/linux

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