111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
#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
|
|
|
|
/*
|
|
* 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
|
|
|
|
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);
|
|
}
|
|
|
|
static inline int user_path(const char __user *name, struct path *path)
|
|
{
|
|
return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
|
|
}
|
|
|
|
static inline int user_lpath(const char __user *name, struct path *path)
|
|
{
|
|
return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 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';
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
#endif /* _LINUX_NAMEI_H */
|