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115 lines
3.3 KiB
115 lines
3.3 KiB
#ifndef _LINUX_NAMEI_H |
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#define _LINUX_NAMEI_H |
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#include <linux/kernel.h> |
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#include <linux/path.h> |
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#include <linux/fcntl.h> |
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#include <linux/errno.h> |
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enum { MAX_NESTED_LINKS = 8 }; |
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#define MAXSYMLINKS 40 |
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/* |
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* Type of the last component on LOOKUP_PARENT |
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*/ |
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enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; |
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/* |
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* The bitmask for a lookup event: |
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* - follow links at the end |
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* - require a directory |
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* - ending slashes ok even for nonexistent files |
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* - internal "there are more path components" flag |
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* - dentry cache is untrusted; force a real lookup |
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* - suppress terminal automount |
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*/ |
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#define LOOKUP_FOLLOW 0x0001 |
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#define LOOKUP_DIRECTORY 0x0002 |
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#define LOOKUP_AUTOMOUNT 0x0004 |
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#define LOOKUP_PARENT 0x0010 |
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#define LOOKUP_REVAL 0x0020 |
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#define LOOKUP_RCU 0x0040 |
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#define LOOKUP_NO_REVAL 0x0080 |
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/* |
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* Intent data |
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*/ |
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#define LOOKUP_OPEN 0x0100 |
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#define LOOKUP_CREATE 0x0200 |
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#define LOOKUP_EXCL 0x0400 |
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#define LOOKUP_RENAME_TARGET 0x0800 |
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#define LOOKUP_JUMPED 0x1000 |
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#define LOOKUP_ROOT 0x2000 |
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#define LOOKUP_EMPTY 0x4000 |
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extern int path_pts(struct path *path); |
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extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
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static inline int user_path_at(int dfd, const char __user *name, unsigned flags, |
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struct path *path) |
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{ |
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return user_path_at_empty(dfd, name, flags, path, NULL); |
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} |
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static inline int user_path(const char __user *name, struct path *path) |
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{ |
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return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL); |
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} |
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static inline int user_lpath(const char __user *name, struct path *path) |
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{ |
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return user_path_at_empty(AT_FDCWD, name, 0, path, NULL); |
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} |
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static inline int user_path_dir(const char __user *name, struct path *path) |
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{ |
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return user_path_at_empty(AT_FDCWD, name, |
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LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL); |
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} |
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extern int kern_path(const char *, unsigned, struct path *); |
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extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
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extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); |
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extern void done_path_create(struct path *, struct dentry *); |
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extern struct dentry *kern_path_locked(const char *, struct path *); |
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extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
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extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
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extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); |
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extern int follow_down_one(struct path *); |
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extern int follow_down(struct path *); |
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extern int follow_up(struct path *); |
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extern struct dentry *lock_rename(struct dentry *, struct dentry *); |
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extern void unlock_rename(struct dentry *, struct dentry *); |
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extern void nd_jump_link(struct path *path); |
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static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
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{ |
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((char *) name)[min(len, maxlen)] = '\0'; |
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} |
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/** |
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* retry_estale - determine whether the caller should retry an operation |
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* @error: the error that would currently be returned |
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* @flags: flags being used for next lookup attempt |
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* |
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* Check to see if the error code was -ESTALE, and then determine whether |
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* to retry the call based on whether "flags" already has LOOKUP_REVAL set. |
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* |
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* Returns true if the caller should try the operation again. |
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*/ |
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static inline bool |
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retry_estale(const long error, const unsigned int flags) |
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{ |
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return error == -ESTALE && !(flags & LOOKUP_REVAL); |
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} |
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#endif /* _LINUX_NAMEI_H */
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