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

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Diff markup

Differences between /include/linux/namei.h (Version linux-5.9.16) and /include/linux/namei.h (Version linux-4.15.18)


  1 /* SPDX-License-Identifier: GPL-2.0 */              1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_NAMEI_H                              2 #ifndef _LINUX_NAMEI_H
  3 #define _LINUX_NAMEI_H                              3 #define _LINUX_NAMEI_H
  4                                                     4 
  5 #include <linux/fs.h>                          << 
  6 #include <linux/kernel.h>                           5 #include <linux/kernel.h>
  7 #include <linux/path.h>                             6 #include <linux/path.h>
  8 #include <linux/fcntl.h>                            7 #include <linux/fcntl.h>
  9 #include <linux/errno.h>                            8 #include <linux/errno.h>
 10                                                     9 
 11 enum { MAX_NESTED_LINKS = 8 };                     10 enum { MAX_NESTED_LINKS = 8 };
 12                                                    11 
 13 #define MAXSYMLINKS 40                             12 #define MAXSYMLINKS 40
 14                                                    13 
 15 /*                                                 14 /*
 16  * Type of the last component on LOOKUP_PARENT     15  * Type of the last component on LOOKUP_PARENT
 17  */                                                16  */
 18 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOT !!  17 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
 19                                                    18 
 20 /* pathwalk mode */                            !!  19 /*
 21 #define LOOKUP_FOLLOW           0x0001  /* fol !!  20  * The bitmask for a lookup event:
 22 #define LOOKUP_DIRECTORY        0x0002  /* req !!  21  *  - follow links at the end
 23 #define LOOKUP_AUTOMOUNT        0x0004  /* for !!  22  *  - require a directory
 24 #define LOOKUP_EMPTY            0x4000  /* acc !!  23  *  - ending slashes ok even for nonexistent files
 25 #define LOOKUP_DOWN             0x8000  /* fol !!  24  *  - internal "there are more path components" flag
 26 #define LOOKUP_MOUNTPOINT       0x0080  /* fol !!  25  *  - dentry cache is untrusted; force a real lookup
 27                                                !!  26  *  - suppress terminal automount
 28 #define LOOKUP_REVAL            0x0020  /* tel !!  27  */
 29 #define LOOKUP_RCU              0x0040  /* RCU !!  28 #define LOOKUP_FOLLOW           0x0001
 30                                                !!  29 #define LOOKUP_DIRECTORY        0x0002
 31 /* These tell filesystem methods that we are d !!  30 #define LOOKUP_AUTOMOUNT        0x0004
 32 #define LOOKUP_OPEN             0x0100  /* ... << 
 33 #define LOOKUP_CREATE           0x0200  /* ... << 
 34 #define LOOKUP_EXCL             0x0400  /* ... << 
 35 #define LOOKUP_RENAME_TARGET    0x0800  /* ... << 
 36                                                    31 
 37 /* internal use only */                        << 
 38 #define LOOKUP_PARENT           0x0010             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 
 39 #define LOOKUP_JUMPED           0x1000             45 #define LOOKUP_JUMPED           0x1000
 40 #define LOOKUP_ROOT             0x2000             46 #define LOOKUP_ROOT             0x2000
 41 #define LOOKUP_ROOT_GRABBED     0x0008         !!  47 #define LOOKUP_EMPTY            0x4000
 42                                                !!  48 #define LOOKUP_DOWN             0x8000
 43 /* Scoping flags for lookup. */                << 
 44 #define LOOKUP_NO_SYMLINKS      0x010000 /* No << 
 45 #define LOOKUP_NO_MAGICLINKS    0x020000 /* No << 
 46 #define LOOKUP_NO_XDEV          0x040000 /* No << 
 47 #define LOOKUP_BENEATH          0x080000 /* No << 
 48 #define LOOKUP_IN_ROOT          0x100000 /* Tr << 
 49 /* LOOKUP_* flags which do scope-related check << 
 50 #define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOO << 
 51                                                    49 
 52 extern int path_pts(struct path *path);            50 extern int path_pts(struct path *path);
 53                                                    51 
 54 extern int user_path_at_empty(int, const char      52 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
 55                                                    53 
 56 static inline int user_path_at(int dfd, const      54 static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
 57                  struct path *path)                55                  struct path *path)
 58 {                                                  56 {
 59         return user_path_at_empty(dfd, name, f     57         return user_path_at_empty(dfd, name, flags, path, NULL);
 60 }                                                  58 }
 61                                                    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 
 62 extern int kern_path(const char *, unsigned, s     76 extern int kern_path(const char *, unsigned, struct path *);
 63                                                    77 
 64 extern struct dentry *kern_path_create(int, co     78 extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
 65 extern struct dentry *user_path_create(int, co     79 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 66 extern void done_path_create(struct path *, st     80 extern void done_path_create(struct path *, struct dentry *);
 67 extern struct dentry *kern_path_locked(const c     81 extern struct dentry *kern_path_locked(const char *, struct path *);
                                                   >>  82 extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
 68                                                    83 
 69 extern struct dentry *try_lookup_one_len(const << 
 70 extern struct dentry *lookup_one_len(const cha     84 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 71 extern struct dentry *lookup_one_len_unlocked(     85 extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
 72 extern struct dentry *lookup_positive_unlocked << 
 73                                                    86 
 74 extern int follow_down_one(struct path *);         87 extern int follow_down_one(struct path *);
 75 extern int follow_down(struct path *);             88 extern int follow_down(struct path *);
 76 extern int follow_up(struct path *);               89 extern int follow_up(struct path *);
 77                                                    90 
 78 extern struct dentry *lock_rename(struct dentr     91 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
 79 extern void unlock_rename(struct dentry *, str     92 extern void unlock_rename(struct dentry *, struct dentry *);
 80                                                    93 
 81 extern int __must_check nd_jump_link(struct pa !!  94 extern void nd_jump_link(struct path *path);
 82                                                    95 
 83 static inline void nd_terminate_link(void *nam     96 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
 84 {                                                  97 {
 85         ((char *) name)[min(len, maxlen)] = '\     98         ((char *) name)[min(len, maxlen)] = '\0';
 86 }                                                  99 }
 87                                                   100 
 88 /**                                               101 /**
 89  * retry_estale - determine whether the caller    102  * retry_estale - determine whether the caller should retry an operation
 90  * @error: the error that would currently be r    103  * @error: the error that would currently be returned
 91  * @flags: flags being used for next lookup at    104  * @flags: flags being used for next lookup attempt
 92  *                                                105  *
 93  * Check to see if the error code was -ESTALE,    106  * Check to see if the error code was -ESTALE, and then determine whether
 94  * to retry the call based on whether "flags"     107  * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
 95  *                                                108  *
 96  * Returns true if the caller should try the o    109  * Returns true if the caller should try the operation again.
 97  */                                               110  */
 98 static inline bool                                111 static inline bool
 99 retry_estale(const long error, const unsigned     112 retry_estale(const long error, const unsigned int flags)
100 {                                                 113 {
101         return error == -ESTALE && !(flags & L    114         return error == -ESTALE && !(flags & LOOKUP_REVAL);
102 }                                                 115 }
103                                                   116 
104 #endif /* _LINUX_NAMEI_H */                       117 #endif /* _LINUX_NAMEI_H */
105                                                   118 

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