v4.19.13 snapshot.
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
new file mode 100644
index 0000000..d0e1f15
--- /dev/null
+++ b/include/linux/proc_fs.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * The proc filesystem constants/structures
+ */
+#ifndef _LINUX_PROC_FS_H
+#define _LINUX_PROC_FS_H
+
+#include <linux/types.h>
+#include <linux/fs.h>
+
+struct proc_dir_entry;
+struct seq_file;
+struct seq_operations;
+
+#ifdef CONFIG_PROC_FS
+
+typedef int (*proc_write_t)(struct file *, char *, size_t);
+
+extern void proc_root_init(void);
+extern void proc_flush_task(struct task_struct *);
+
+extern struct proc_dir_entry *proc_symlink(const char *,
+ struct proc_dir_entry *, const char *);
+extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
+extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
+ struct proc_dir_entry *, void *);
+extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
+ struct proc_dir_entry *);
+struct proc_dir_entry *proc_create_mount_point(const char *name);
+
+struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
+ struct proc_dir_entry *parent, const struct seq_operations *ops,
+ unsigned int state_size, void *data);
+#define proc_create_seq_data(name, mode, parent, ops, data) \
+ proc_create_seq_private(name, mode, parent, ops, 0, data)
+#define proc_create_seq(name, mode, parent, ops) \
+ proc_create_seq_private(name, mode, parent, ops, 0, NULL)
+struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
+ struct proc_dir_entry *parent,
+ int (*show)(struct seq_file *, void *), void *data);
+#define proc_create_single(name, mode, parent, show) \
+ proc_create_single_data(name, mode, parent, show, NULL)
+
+extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
+ struct proc_dir_entry *,
+ const struct file_operations *,
+ void *);
+
+struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct file_operations *proc_fops);
+extern void proc_set_size(struct proc_dir_entry *, loff_t);
+extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
+extern void *PDE_DATA(const struct inode *);
+extern void *proc_get_parent_data(const struct inode *);
+extern void proc_remove(struct proc_dir_entry *);
+extern void remove_proc_entry(const char *, struct proc_dir_entry *);
+extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
+
+struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
+ struct proc_dir_entry *parent, const struct seq_operations *ops,
+ unsigned int state_size, void *data);
+#define proc_create_net(name, mode, parent, state_size, ops) \
+ proc_create_net_data(name, mode, parent, state_size, ops, NULL)
+struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
+ struct proc_dir_entry *parent,
+ int (*show)(struct seq_file *, void *), void *data);
+struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
+ struct proc_dir_entry *parent,
+ const struct seq_operations *ops,
+ proc_write_t write,
+ unsigned int state_size, void *data);
+struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
+ struct proc_dir_entry *parent,
+ int (*show)(struct seq_file *, void *),
+ proc_write_t write,
+ void *data);
+
+#else /* CONFIG_PROC_FS */
+
+static inline void proc_root_init(void)
+{
+}
+
+static inline void proc_flush_task(struct task_struct *task)
+{
+}
+
+static inline struct proc_dir_entry *proc_symlink(const char *name,
+ struct proc_dir_entry *parent,const char *dest) { return NULL;}
+static inline struct proc_dir_entry *proc_mkdir(const char *name,
+ struct proc_dir_entry *parent) {return NULL;}
+static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
+static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
+ umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
+static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
+ umode_t mode, struct proc_dir_entry *parent) { return NULL; }
+#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
+#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
+#define proc_create_seq(name, mode, parent, ops) ({NULL;})
+#define proc_create_single(name, mode, parent, show) ({NULL;})
+#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
+#define proc_create(name, mode, parent, proc_fops) ({NULL;})
+#define proc_create_data(name, mode, parent, proc_fops, data) ({NULL;})
+
+static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
+static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
+static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
+static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
+
+static inline void proc_remove(struct proc_dir_entry *de) {}
+#define remove_proc_entry(name, parent) do {} while (0)
+static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }
+
+#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
+#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
+#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
+
+#endif /* CONFIG_PROC_FS */
+
+struct net;
+
+static inline struct proc_dir_entry *proc_net_mkdir(
+ struct net *net, const char *name, struct proc_dir_entry *parent)
+{
+ return proc_mkdir_data(name, 0, parent, net);
+}
+
+struct ns_common;
+int open_related_ns(struct ns_common *ns,
+ struct ns_common *(*get_ns)(struct ns_common *ns));
+
+/* get the associated pid namespace for a file in procfs */
+static inline struct pid_namespace *proc_pid_ns(const struct inode *inode)
+{
+ return inode->i_sb->s_fs_info;
+}
+
+#endif /* _LINUX_PROC_FS_H */