~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 /* pathwalk mode */
 20 #define LOOKUP_FOLLOW           0x0001  /* follow links at the end */
 21 #define LOOKUP_DIRECTORY        0x0002  /* require a directory */
 22 #define LOOKUP_AUTOMOUNT        0x0004  /* force terminal automount */
 23 #define LOOKUP_EMPTY            0x4000  /* accept empty path [user_... only] */
 24 #define LOOKUP_DOWN             0x8000  /* follow mounts in the starting point */
 25 
 26 #define LOOKUP_REVAL            0x0020  /* tell ->d_revalidate() to trust no cache */
 27 #define LOOKUP_RCU              0x0040  /* RCU pathwalk mode; semi-internal */
 28 
 29 /* These tell filesystem methods that we are dealing with the final component... */
 30 #define LOOKUP_OPEN             0x0100  /* ... in open */
 31 #define LOOKUP_CREATE           0x0200  /* ... in object creation */
 32 #define LOOKUP_EXCL             0x0400  /* ... in exclusive creation */
 33 #define LOOKUP_RENAME_TARGET    0x0800  /* ... in destination of rename() */
 34 
 35 /* internal use only */
 36 #define LOOKUP_PARENT           0x0010
 37 #define LOOKUP_JUMPED           0x1000
 38 #define LOOKUP_ROOT             0x2000
 39 #define LOOKUP_ROOT_GRABBED     0x0008
 40 
 41 extern int path_pts(struct path *path);
 42 
 43 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
 44 
 45 static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
 46                  struct path *path)
 47 {
 48         return user_path_at_empty(dfd, name, flags, path, NULL);
 49 }
 50 
 51 extern int kern_path(const char *, unsigned, struct path *);
 52 
 53 extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
 54 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 55 extern void done_path_create(struct path *, struct dentry *);
 56 extern struct dentry *kern_path_locked(const char *, struct path *);
 57 extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
 58 
 59 extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
 60 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 61 extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
 62 extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int);
 63 
 64 extern int follow_down_one(struct path *);
 65 extern int follow_down(struct path *);
 66 extern int follow_up(struct path *);
 67 
 68 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
 69 extern void unlock_rename(struct dentry *, struct dentry *);
 70 
 71 extern void nd_jump_link(struct path *path);
 72 
 73 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
 74 {
 75         ((char *) name)[min(len, maxlen)] = '\0';
 76 }
 77 
 78 /**
 79  * retry_estale - determine whether the caller should retry an operation
 80  * @error: the error that would currently be returned
 81  * @flags: flags being used for next lookup attempt
 82  *
 83  * Check to see if the error code was -ESTALE, and then determine whether
 84  * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
 85  *
 86  * Returns true if the caller should try the operation again.
 87  */
 88 static inline bool
 89 retry_estale(const long error, const unsigned int flags)
 90 {
 91         return error == -ESTALE && !(flags & LOOKUP_REVAL);
 92 }
 93 
 94 #endif /* _LINUX_NAMEI_H */
 95 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp