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TOMOYO Linux Cross Reference
Linux/include/linux/namei.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_NAMEI_H
  3 #define _LINUX_NAMEI_H
  4 
  5 #include <linux/kernel.h>
  6 #include <linux/path.h>
  7 #include <linux/fcntl.h>
  8 #include <linux/errno.h>
  9 
 10 enum { MAX_NESTED_LINKS = 8 };
 11 
 12 #define MAXSYMLINKS 40
 13 
 14 /*
 15  * Type of the last component on LOOKUP_PARENT
 16  */
 17 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
 18 
 19 /*
 20  * The bitmask for a lookup event:
 21  *  - follow links at the end
 22  *  - require a directory
 23  *  - ending slashes ok even for nonexistent files
 24  *  - internal "there are more path components" flag
 25  *  - dentry cache is untrusted; force a real lookup
 26  *  - suppress terminal automount
 27  */
 28 #define LOOKUP_FOLLOW           0x0001
 29 #define LOOKUP_DIRECTORY        0x0002
 30 #define LOOKUP_AUTOMOUNT        0x0004
 31 
 32 #define LOOKUP_PARENT           0x0010
 33 #define LOOKUP_REVAL            0x0020
 34 #define LOOKUP_RCU              0x0040
 35 #define LOOKUP_NO_REVAL         0x0080
 36 
 37 /*
 38  * Intent data
 39  */
 40 #define LOOKUP_OPEN             0x0100
 41 #define LOOKUP_CREATE           0x0200
 42 #define LOOKUP_EXCL             0x0400
 43 #define LOOKUP_RENAME_TARGET    0x0800
 44 
 45 #define LOOKUP_JUMPED           0x1000
 46 #define LOOKUP_ROOT             0x2000
 47 #define LOOKUP_EMPTY            0x4000
 48 #define LOOKUP_DOWN             0x8000
 49 
 50 extern int path_pts(struct path *path);
 51 
 52 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
 53 
 54 static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
 55                  struct path *path)
 56 {
 57         return user_path_at_empty(dfd, name, flags, path, NULL);
 58 }
 59 
 60 static inline int user_path(const char __user *name, struct path *path)
 61 {
 62         return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
 63 }
 64 
 65 static inline int user_lpath(const char __user *name, struct path *path)
 66 {
 67         return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
 68 }
 69 
 70 static inline int user_path_dir(const char __user *name, struct path *path)
 71 {
 72         return user_path_at_empty(AT_FDCWD, name,
 73                                   LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL);
 74 }
 75 
 76 extern int kern_path(const char *, unsigned, struct path *);
 77 
 78 extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
 79 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 80 extern void done_path_create(struct path *, struct dentry *);
 81 extern struct dentry *kern_path_locked(const char *, struct path *);
 82 extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
 83 
 84 extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
 85 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 86 extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
 87 
 88 extern int follow_down_one(struct path *);
 89 extern int follow_down(struct path *);
 90 extern int follow_up(struct path *);
 91 
 92 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
 93 extern void unlock_rename(struct dentry *, struct dentry *);
 94 
 95 extern void nd_jump_link(struct path *path);
 96 
 97 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
 98 {
 99         ((char *) name)[min(len, maxlen)] = '\0';
100 }
101 
102 /**
103  * retry_estale - determine whether the caller should retry an operation
104  * @error: the error that would currently be returned
105  * @flags: flags being used for next lookup attempt
106  *
107  * Check to see if the error code was -ESTALE, and then determine whether
108  * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
109  *
110  * Returns true if the caller should try the operation again.
111  */
112 static inline bool
113 retry_estale(const long error, const unsigned int flags)
114 {
115         return error == -ESTALE && !(flags & LOOKUP_REVAL);
116 }
117 
118 #endif /* _LINUX_NAMEI_H */
119 

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