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

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

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