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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/fs.h>
  6 #include <linux/kernel.h>
  7 #include <linux/path.h>
  8 #include <linux/fcntl.h>
  9 #include <linux/errno.h>
 10 
 11 enum { MAX_NESTED_LINKS = 8 };
 12 
 13 #define MAXSYMLINKS 40
 14 
 15 /*
 16  * Type of the last component on LOOKUP_PARENT
 17  */
 18 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
 19 
 20 /* pathwalk mode */
 21 #define LOOKUP_FOLLOW           0x0001  /* follow links at the end */
 22 #define LOOKUP_DIRECTORY        0x0002  /* require a directory */
 23 #define LOOKUP_AUTOMOUNT        0x0004  /* force terminal automount */
 24 #define LOOKUP_EMPTY            0x4000  /* accept empty path [user_... only] */
 25 #define LOOKUP_DOWN             0x8000  /* follow mounts in the starting point */
 26 #define LOOKUP_MOUNTPOINT       0x0080  /* follow mounts in the end */
 27 
 28 #define LOOKUP_REVAL            0x0020  /* tell ->d_revalidate() to trust no cache */
 29 #define LOOKUP_RCU              0x0040  /* RCU pathwalk mode; semi-internal */
 30 
 31 /* These tell filesystem methods that we are dealing with the final component... */
 32 #define LOOKUP_OPEN             0x0100  /* ... in open */
 33 #define LOOKUP_CREATE           0x0200  /* ... in object creation */
 34 #define LOOKUP_EXCL             0x0400  /* ... in exclusive creation */
 35 #define LOOKUP_RENAME_TARGET    0x0800  /* ... in destination of rename() */
 36 
 37 /* internal use only */
 38 #define LOOKUP_PARENT           0x0010
 39 #define LOOKUP_JUMPED           0x1000
 40 #define LOOKUP_ROOT             0x2000
 41 #define LOOKUP_ROOT_GRABBED     0x0008
 42 
 43 /* Scoping flags for lookup. */
 44 #define LOOKUP_NO_SYMLINKS      0x010000 /* No symlink crossing. */
 45 #define LOOKUP_NO_MAGICLINKS    0x020000 /* No nd_jump_link() crossing. */
 46 #define LOOKUP_NO_XDEV          0x040000 /* No mountpoint crossing. */
 47 #define LOOKUP_BENEATH          0x080000 /* No escaping from starting point. */
 48 #define LOOKUP_IN_ROOT          0x100000 /* Treat dirfd as fs root. */
 49 /* LOOKUP_* flags which do scope-related checks based on the dirfd. */
 50 #define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOOKUP_IN_ROOT)
 51 
 52 extern int path_pts(struct path *path);
 53 
 54 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
 55 
 56 static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
 57                  struct path *path)
 58 {
 59         return user_path_at_empty(dfd, name, flags, path, NULL);
 60 }
 61 
 62 extern int kern_path(const char *, unsigned, struct path *);
 63 
 64 extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
 65 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 66 extern void done_path_create(struct path *, struct dentry *);
 67 extern struct dentry *kern_path_locked(const char *, struct path *);
 68 
 69 extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
 70 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 71 extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
 72 extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int);
 73 
 74 extern int follow_down_one(struct path *);
 75 extern int follow_down(struct path *);
 76 extern int follow_up(struct path *);
 77 
 78 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
 79 extern void unlock_rename(struct dentry *, struct dentry *);
 80 
 81 extern int __must_check nd_jump_link(struct path *path);
 82 
 83 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
 84 {
 85         ((char *) name)[min(len, maxlen)] = '\0';
 86 }
 87 
 88 /**
 89  * retry_estale - determine whether the caller should retry an operation
 90  * @error: the error that would currently be returned
 91  * @flags: flags being used for next lookup attempt
 92  *
 93  * Check to see if the error code was -ESTALE, and then determine whether
 94  * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
 95  *
 96  * Returns true if the caller should try the operation again.
 97  */
 98 static inline bool
 99 retry_estale(const long error, const unsigned int flags)
100 {
101         return error == -ESTALE && !(flags & LOOKUP_REVAL);
102 }
103 
104 #endif /* _LINUX_NAMEI_H */
105 

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