Branch data Line data Source code
1 : : #ifndef _LINUX_NAMEI_H
2 : : #define _LINUX_NAMEI_H
3 : :
4 : : #include <linux/dcache.h>
5 : : #include <linux/errno.h>
6 : : #include <linux/linkage.h>
7 : : #include <linux/path.h>
8 : :
9 : : struct vfsmount;
10 : :
11 : : enum { MAX_NESTED_LINKS = 8 };
12 : :
13 : : struct nameidata {
14 : : struct path path;
15 : : struct qstr last;
16 : : struct path root;
17 : : struct inode *inode; /* path.dentry.d_inode */
18 : : unsigned int flags;
19 : : unsigned seq, m_seq;
20 : : int last_type;
21 : : unsigned depth;
22 : : char *saved_names[MAX_NESTED_LINKS + 1];
23 : : };
24 : :
25 : : /*
26 : : * Type of the last component on LOOKUP_PARENT
27 : : */
28 : : enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
29 : :
30 : : /*
31 : : * The bitmask for a lookup event:
32 : : * - follow links at the end
33 : : * - require a directory
34 : : * - ending slashes ok even for nonexistent files
35 : : * - internal "there are more path components" flag
36 : : * - dentry cache is untrusted; force a real lookup
37 : : * - suppress terminal automount
38 : : */
39 : : #define LOOKUP_FOLLOW 0x0001
40 : : #define LOOKUP_DIRECTORY 0x0002
41 : : #define LOOKUP_AUTOMOUNT 0x0004
42 : :
43 : : #define LOOKUP_PARENT 0x0010
44 : : #define LOOKUP_REVAL 0x0020
45 : : #define LOOKUP_RCU 0x0040
46 : :
47 : : /*
48 : : * Intent data
49 : : */
50 : : #define LOOKUP_OPEN 0x0100
51 : : #define LOOKUP_CREATE 0x0200
52 : : #define LOOKUP_EXCL 0x0400
53 : : #define LOOKUP_RENAME_TARGET 0x0800
54 : :
55 : : #define LOOKUP_JUMPED 0x1000
56 : : #define LOOKUP_ROOT 0x2000
57 : : #define LOOKUP_EMPTY 0x4000
58 : :
59 : : extern int user_path_at(int, const char __user *, unsigned, struct path *);
60 : : extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
61 : :
62 : : #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
63 : : #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
64 : : #define user_path_dir(name, path) \
65 : : user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
66 : :
67 : : extern int kern_path(const char *, unsigned, struct path *);
68 : :
69 : : extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
70 : : extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
71 : : extern void done_path_create(struct path *, struct dentry *);
72 : : extern struct dentry *kern_path_locked(const char *, struct path *);
73 : : extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
74 : :
75 : : extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
76 : :
77 : : extern int follow_down_one(struct path *);
78 : : extern int follow_down(struct path *);
79 : : extern int follow_up(struct path *);
80 : :
81 : : extern struct dentry *lock_rename(struct dentry *, struct dentry *);
82 : : extern void unlock_rename(struct dentry *, struct dentry *);
83 : :
84 : : extern void nd_jump_link(struct nameidata *nd, struct path *path);
85 : :
86 : : static inline void nd_set_link(struct nameidata *nd, char *path)
87 : : {
88 : 273892 : nd->saved_names[nd->depth] = path;
89 : : }
90 : :
91 : : static inline char *nd_get_link(struct nameidata *nd)
92 : : {
93 : 146745 : return nd->saved_names[nd->depth];
94 : : }
95 : :
96 : : static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
97 : : {
98 : 4079 : ((char *) name)[min(len, maxlen)] = '\0';
99 : : }
100 : :
101 : : /**
102 : : * retry_estale - determine whether the caller should retry an operation
103 : : * @error: the error that would currently be returned
104 : : * @flags: flags being used for next lookup attempt
105 : : *
106 : : * Check to see if the error code was -ESTALE, and then determine whether
107 : : * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
108 : : *
109 : : * Returns true if the caller should try the operation again.
110 : : */
111 : : static inline bool
112 : : retry_estale(const long error, const unsigned int flags)
113 : : {
114 [ - + ][ # # ]: 1872528 : return error == -ESTALE && !(flags & LOOKUP_REVAL);
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115 : : }
116 : :
117 : : #endif /* _LINUX_NAMEI_H */
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