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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  *  - skip revalidation
 28  *  - don't fetch xattrs on audit_inode
 29  */
 30 #define LOOKUP_FOLLOW           0x0001
 31 #define LOOKUP_DIRECTORY        0x0002
 32 #define LOOKUP_AUTOMOUNT        0x0004
 33 
 34 #define LOOKUP_PARENT           0x0010
 35 #define LOOKUP_REVAL            0x0020
 36 #define LOOKUP_RCU              0x0040
 37 #define LOOKUP_NO_REVAL         0x0080
 38 #define LOOKUP_NO_EVAL          0x0100
 39 
 40 /*
 41  * Intent data
 42  */
 43 #define LOOKUP_OPEN             0x0100
 44 #define LOOKUP_CREATE           0x0200
 45 #define LOOKUP_EXCL             0x0400
 46 #define LOOKUP_RENAME_TARGET    0x0800
 47 
 48 #define LOOKUP_JUMPED           0x1000
 49 #define LOOKUP_ROOT             0x2000
 50 #define LOOKUP_EMPTY            0x4000
 51 #define LOOKUP_DOWN             0x8000
 52 
 53 extern int path_pts(struct path *path);
 54 
 55 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
 56 
 57 static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
 58                  struct path *path)
 59 {
 60         return user_path_at_empty(dfd, name, flags, path, NULL);
 61 }
 62 
 63 static inline int user_path(const char __user *name, struct path *path)
 64 {
 65         return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
 66 }
 67 
 68 static inline int user_lpath(const char __user *name, struct path *path)
 69 {
 70         return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
 71 }
 72 
 73 static inline int user_path_dir(const char __user *name, struct path *path)
 74 {
 75         return user_path_at_empty(AT_FDCWD, name,
 76                                   LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL);
 77 }
 78 
 79 extern int kern_path(const char *, unsigned, struct path *);
 80 
 81 extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
 82 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 83 extern void done_path_create(struct path *, struct dentry *);
 84 extern struct dentry *kern_path_locked(const char *, struct path *);
 85 extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
 86 
 87 extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
 88 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 89 extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
 90 
 91 extern int follow_down_one(struct path *);
 92 extern int follow_down(struct path *);
 93 extern int follow_up(struct path *);
 94 
 95 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
 96 extern void unlock_rename(struct dentry *, struct dentry *);
 97 
 98 extern void nd_jump_link(struct path *path);
 99 
100 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
101 {
102         ((char *) name)[min(len, maxlen)] = '\0';
103 }
104 
105 /**
106  * retry_estale - determine whether the caller should retry an operation
107  * @error: the error that would currently be returned
108  * @flags: flags being used for next lookup attempt
109  *
110  * Check to see if the error code was -ESTALE, and then determine whether
111  * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
112  *
113  * Returns true if the caller should try the operation again.
114  */
115 static inline bool
116 retry_estale(const long error, const unsigned int flags)
117 {
118         return error == -ESTALE && !(flags & LOOKUP_REVAL);
119 }
120 
121 #endif /* _LINUX_NAMEI_H */
122 

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