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Commit | Line | Data |
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b8441ed2 TH |
1 | /* |
2 | * kernfs.h - pseudo filesystem decoupled from vfs locking | |
3 | * | |
4 | * This file is released under the GPLv2. | |
5 | */ | |
6 | ||
7 | #ifndef __LINUX_KERNFS_H | |
8 | #define __LINUX_KERNFS_H | |
9 | ||
879f40d1 | 10 | #include <linux/kernel.h> |
5d0e26bb | 11 | #include <linux/err.h> |
dd8a5b03 TH |
12 | #include <linux/list.h> |
13 | #include <linux/mutex.h> | |
879f40d1 | 14 | |
5d60418e TH |
15 | struct file; |
16 | struct iattr; | |
dd8a5b03 TH |
17 | struct seq_file; |
18 | struct vm_area_struct; | |
5d60418e | 19 | |
b8441ed2 TH |
20 | struct sysfs_dirent; |
21 | ||
dd8a5b03 TH |
22 | struct sysfs_open_file { |
23 | /* published fields */ | |
24 | struct sysfs_dirent *sd; | |
25 | struct file *file; | |
26 | ||
27 | /* private fields, do not use outside kernfs proper */ | |
28 | struct mutex mutex; | |
29 | int event; | |
30 | struct list_head list; | |
31 | ||
32 | bool mmapped; | |
33 | const struct vm_operations_struct *vm_ops; | |
34 | }; | |
35 | ||
f6acf8bb TH |
36 | struct kernfs_ops { |
37 | /* | |
38 | * Read is handled by either seq_file or raw_read(). | |
39 | * | |
40 | * If seq_show() is present, seq_file path is active. The behavior | |
41 | * is equivalent to single_open(). @sf->private points to the | |
42 | * associated sysfs_open_file. | |
43 | * | |
44 | * read() is bounced through kernel buffer and a read larger than | |
45 | * PAGE_SIZE results in partial operation of PAGE_SIZE. | |
46 | */ | |
47 | int (*seq_show)(struct seq_file *sf, void *v); | |
48 | ||
49 | ssize_t (*read)(struct sysfs_open_file *of, char *buf, size_t bytes, | |
50 | loff_t off); | |
51 | ||
52 | /* | |
53 | * write() is bounced through kernel buffer and a write larger than | |
54 | * PAGE_SIZE results in partial operation of PAGE_SIZE. | |
55 | */ | |
56 | ssize_t (*write)(struct sysfs_open_file *of, char *buf, size_t bytes, | |
57 | loff_t off); | |
58 | ||
59 | int (*mmap)(struct sysfs_open_file *of, struct vm_area_struct *vma); | |
60 | }; | |
61 | ||
879f40d1 TH |
62 | #ifdef CONFIG_SYSFS |
63 | ||
93b2b8e4 TH |
64 | struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent, |
65 | const char *name, void *priv, | |
66 | const void *ns); | |
5d0e26bb TH |
67 | struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent, |
68 | const char *name, | |
69 | struct sysfs_dirent *target); | |
879f40d1 TH |
70 | void kernfs_remove(struct sysfs_dirent *sd); |
71 | int kernfs_remove_by_name_ns(struct sysfs_dirent *parent, const char *name, | |
72 | const void *ns); | |
890ece16 TH |
73 | int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent, |
74 | const char *new_name, const void *new_ns); | |
93b2b8e4 | 75 | void kernfs_enable_ns(struct sysfs_dirent *sd); |
5d60418e | 76 | int kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr); |
879f40d1 TH |
77 | |
78 | #else /* CONFIG_SYSFS */ | |
79 | ||
93b2b8e4 TH |
80 | static inline struct sysfs_dirent * |
81 | kernfs_create_dir_ns(struct sysfs_dirent *parent, const char *name, void *priv, | |
82 | const void *ns) | |
83 | { return ERR_PTR(-ENOSYS); } | |
84 | ||
5d0e26bb TH |
85 | static inline struct sysfs_dirent * |
86 | kernfs_create_link(struct sysfs_dirent *parent, const char *name, | |
87 | struct sysfs_dirent *target) | |
88 | { return ERR_PTR(-ENOSYS); } | |
89 | ||
879f40d1 TH |
90 | static inline void kernfs_remove(struct sysfs_dirent *sd) { } |
91 | ||
92 | static inline int kernfs_remove_by_name_ns(struct sysfs_dirent *parent, | |
93 | const char *name, const void *ns) | |
94 | { return -ENOSYS; } | |
95 | ||
890ece16 TH |
96 | static inline int kernfs_rename_ns(struct sysfs_dirent *sd, |
97 | struct sysfs_dirent *new_parent, | |
98 | const char *new_name, const void *new_ns) | |
99 | { return -ENOSYS; } | |
100 | ||
93b2b8e4 TH |
101 | static inline void kernfs_enable_ns(struct sysfs_dirent *sd) { } |
102 | ||
5d60418e TH |
103 | static inline int kernfs_setattr(struct sysfs_dirent *sd, |
104 | const struct iattr *iattr) | |
105 | { return -ENOSYS; } | |
106 | ||
879f40d1 TH |
107 | #endif /* CONFIG_SYSFS */ |
108 | ||
93b2b8e4 TH |
109 | static inline struct sysfs_dirent * |
110 | kernfs_create_dir(struct sysfs_dirent *parent, const char *name, void *priv) | |
111 | { | |
112 | return kernfs_create_dir_ns(parent, name, priv, NULL); | |
113 | } | |
114 | ||
879f40d1 TH |
115 | static inline int kernfs_remove_by_name(struct sysfs_dirent *parent, |
116 | const char *name) | |
117 | { | |
118 | return kernfs_remove_by_name_ns(parent, name, NULL); | |
119 | } | |
120 | ||
b8441ed2 | 121 | #endif /* __LINUX_KERNFS_H */ |