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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | #ifndef _LINUX_NAMEI_H #define _LINUX_NAMEI_H #include <linux/dcache.h> #include <linux/linkage.h> #include <linux/path.h> struct vfsmount; struct open_intent { int flags; int create_mode; struct file *file; }; enum { MAX_NESTED_LINKS = 8 }; struct nameidata { struct path path; struct qstr last; struct path root; struct inode *inode; /* path.dentry.d_inode */ unsigned int flags; unsigned seq; int last_type; unsigned depth; char *saved_names[MAX_NESTED_LINKS + 1]; /* Intent data */ union { struct open_intent open; } intent; }; /* * Type of the last component on LOOKUP_PARENT */ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; /* * The bitmask for a lookup event: * - follow links at the end * - require a directory * - ending slashes ok even for nonexistent files * - internal "there are more path components" flag * - dentry cache is untrusted; force a real lookup * - suppress terminal automount */ #define LOOKUP_FOLLOW 0x0001 #define LOOKUP_DIRECTORY 0x0002 #define LOOKUP_CONTINUE 0x0004 #define LOOKUP_AUTOMOUNT 0x0008 #define LOOKUP_PARENT 0x0010 #define LOOKUP_REVAL 0x0020 #define LOOKUP_RCU 0x0040 #define LOOKUP_NO_AUTOMOUNT 0x0080 /* * Intent data */ #define LOOKUP_OPEN 0x0100 #define LOOKUP_CREATE 0x0200 #define LOOKUP_EXCL 0x0400 #define LOOKUP_RENAME_TARGET 0x0800 #define LOOKUP_JUMPED 0x1000 #define LOOKUP_ROOT 0x2000 #define LOOKUP_EMPTY 0x4000 extern int user_path_at(int, const char __user *, unsigned, struct path *); extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) #define user_path_dir(name, path) \ user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) extern int kern_path(const char *, unsigned, struct path *); extern int kern_path_parent(const char *, struct nameidata *); extern int vfs_path_lookup(struct dentry *, struct vfsmount *, const char *, unsigned int, struct nameidata *); extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, int (*open)(struct inode *, struct file *)); extern struct dentry *lookup_one_len(const char *, struct dentry *, int); extern int follow_down_one(struct path *); extern int follow_down(struct path *); extern int follow_up(struct path *); extern struct dentry *lock_rename(struct dentry *, struct dentry *); extern void unlock_rename(struct dentry *, struct dentry *); static inline void nd_set_link(struct nameidata *nd, char *path) { nd->saved_names[nd->depth] = path; } static inline char *nd_get_link(struct nameidata *nd) { return nd->saved_names[nd->depth]; } static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) { ((char *) name)[min(len, maxlen)] = '\0'; } #endif /* _LINUX_NAMEI_H */ |