1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * The proc filesystem constants/structures 4 */ 5 #ifndef _LINUX_PROC_FS_H 6 #define _LINUX_PROC_FS_H 7 8 #include <linux/types.h> 9 #include <linux/fs.h> 10 11 struct proc_dir_entry; 12 struct seq_file; 13 struct seq_operations; 14 15 #ifdef CONFIG_PROC_FS 16 17 typedef int (*proc_write_t)(struct file *, char *, size_t); 18 19 extern void proc_root_init(void); 20 extern void proc_flush_task(struct task_struct *); 21 22 extern struct proc_dir_entry *proc_symlink(const char *, 23 struct proc_dir_entry *, const char *); 24 extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *); 25 extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t, 26 struct proc_dir_entry *, void *); 27 extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t, 28 struct proc_dir_entry *); 29 struct proc_dir_entry *proc_create_mount_point(const char *name); 30 31 struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode, 32 struct proc_dir_entry *parent, const struct seq_operations *ops, 33 unsigned int state_size, void *data); 34 #define proc_create_seq_data(name, mode, parent, ops, data) \ 35 proc_create_seq_private(name, mode, parent, ops, 0, data) 36 #define proc_create_seq(name, mode, parent, ops) \ 37 proc_create_seq_private(name, mode, parent, ops, 0, NULL) 38 struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode, 39 struct proc_dir_entry *parent, 40 int (*show)(struct seq_file *, void *), void *data); 41 #define proc_create_single(name, mode, parent, show) \ 42 proc_create_single_data(name, mode, parent, show, NULL) 43 44 extern struct proc_dir_entry *proc_create_data(const char *, umode_t, 45 struct proc_dir_entry *, 46 const struct file_operations *, 47 void *); 48 49 struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct file_operations *proc_fops); 50 extern void proc_set_size(struct proc_dir_entry *, loff_t); 51 extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t); 52 extern void *PDE_DATA(const struct inode *); 53 extern void *proc_get_parent_data(const struct inode *); 54 extern void proc_remove(struct proc_dir_entry *); 55 extern void remove_proc_entry(const char *, struct proc_dir_entry *); 56 extern int remove_proc_subtree(const char *, struct proc_dir_entry *); 57 58 struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode, 59 struct proc_dir_entry *parent, const struct seq_operations *ops, 60 unsigned int state_size, void *data); 61 #define proc_create_net(name, mode, parent, state_size, ops) \ 62 proc_create_net_data(name, mode, parent, state_size, ops, NULL) 63 struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode, 64 struct proc_dir_entry *parent, 65 int (*show)(struct seq_file *, void *), void *data); 66 struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode, 67 struct proc_dir_entry *parent, 68 const struct seq_operations *ops, 69 proc_write_t write, 70 unsigned int state_size, void *data); 71 struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode, 72 struct proc_dir_entry *parent, 73 int (*show)(struct seq_file *, void *), 74 proc_write_t write, 75 void *data); 76 extern struct pid *tgid_pidfd_to_pid(const struct file *file); 77 78 #else /* CONFIG_PROC_FS */ 79 80 static inline void proc_root_init(void) 81 { 82 } 83 84 static inline void proc_flush_task(struct task_struct *task) 85 { 86 } 87 88 static inline struct proc_dir_entry *proc_symlink(const char *name, 89 struct proc_dir_entry *parent,const char *dest) { return NULL;} 90 static inline struct proc_dir_entry *proc_mkdir(const char *name, 91 struct proc_dir_entry *parent) {return NULL;} 92 static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; } 93 static inline struct proc_dir_entry *proc_mkdir_data(const char *name, 94 umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; } 95 static inline struct proc_dir_entry *proc_mkdir_mode(const char *name, 96 umode_t mode, struct proc_dir_entry *parent) { return NULL; } 97 #define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;}) 98 #define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;}) 99 #define proc_create_seq(name, mode, parent, ops) ({NULL;}) 100 #define proc_create_single(name, mode, parent, show) ({NULL;}) 101 #define proc_create_single_data(name, mode, parent, show, data) ({NULL;}) 102 #define proc_create(name, mode, parent, proc_fops) ({NULL;}) 103 #define proc_create_data(name, mode, parent, proc_fops, data) ({NULL;}) 104 105 static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {} 106 static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {} 107 static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;} 108 static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; } 109 110 static inline void proc_remove(struct proc_dir_entry *de) {} 111 #define remove_proc_entry(name, parent) do {} while (0) 112 static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; } 113 114 #define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;}) 115 #define proc_create_net(name, mode, parent, state_size, ops) ({NULL;}) 116 #define proc_create_net_single(name, mode, parent, show, data) ({NULL;}) 117 118 static inline struct pid *tgid_pidfd_to_pid(const struct file *file) 119 { 120 return ERR_PTR(-EBADF); 121 } 122 123 #endif /* CONFIG_PROC_FS */ 124 125 struct net; 126 127 static inline struct proc_dir_entry *proc_net_mkdir( 128 struct net *net, const char *name, struct proc_dir_entry *parent) 129 { 130 return proc_mkdir_data(name, 0, parent, net); 131 } 132 133 struct ns_common; 134 int open_related_ns(struct ns_common *ns, 135 struct ns_common *(*get_ns)(struct ns_common *ns)); 136 137 /* get the associated pid namespace for a file in procfs */ 138 static inline struct pid_namespace *proc_pid_ns(const struct inode *inode) 139 { 140 return inode->i_sb->s_fs_info; 141 } 142 143 #endif /* _LINUX_PROC_FS_H */ 144