add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/proc/internal.h
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@@ -1,12 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /* Internal procfs definitions
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  *
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  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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  * Written by David Howells (dhowells@redhat.com)
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #include <linux/proc_fs.h>
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@@ -43,7 +39,10 @@
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 	spinlock_t pde_unload_lock;
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 	struct completion *pde_unload_completion;
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 	const struct inode_operations *proc_iops;
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-	const struct file_operations *proc_fops;
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+	union {
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+		const struct proc_ops *proc_ops;
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+		const struct file_operations *proc_dir_ops;
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+	};
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 	const struct dentry_operations *proc_dops;
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 	union {
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 		const struct seq_operations *seq_ops;
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@@ -62,6 +61,7 @@
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 	struct rb_node subdir_node;
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 	char *name;
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 	umode_t mode;
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+	u8 flags;
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 	u8 namelen;
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 	char inline_name[];
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 } __randomize_layout;
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@@ -74,6 +74,11 @@
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 	0)
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 #define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry))
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+static inline bool pde_is_permanent(const struct proc_dir_entry *pde)
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+{
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+	return pde->flags & PROC_ENTRY_PERMANENT;
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+}
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+
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 extern struct kmem_cache *proc_dir_entry_cache;
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 void pde_free(struct proc_dir_entry *pde);
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@@ -82,6 +87,7 @@
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 	int (*proc_show)(struct seq_file *m,
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 		struct pid_namespace *ns, struct pid *pid,
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 		struct task_struct *task);
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+	const char *lsm;
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 };
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 struct proc_inode {
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@@ -91,7 +97,7 @@
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 	struct proc_dir_entry *pde;
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 	struct ctl_table_header *sysctl;
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 	struct ctl_table *sysctl_entry;
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-	struct hlist_node sysctl_inodes;
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+	struct hlist_node sibling_inodes;
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 	const struct proc_ns_operations *ns_ops;
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 	struct inode vfs_inode;
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 } __randomize_layout;
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@@ -158,11 +164,12 @@
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 extern const struct dentry_operations pid_dentry_operations;
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 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
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 extern int proc_setattr(struct dentry *, struct iattr *);
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+extern void proc_pid_evict_inode(struct proc_inode *);
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 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
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 extern void pid_update_inode(struct task_struct *, struct inode *);
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 extern int pid_delete_dentry(const struct dentry *);
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 extern int proc_pid_readdir(struct file *, struct dir_context *);
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-extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
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+struct dentry *proc_pid_lookup(struct dentry *, unsigned int);
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 extern loff_t mem_lseek(struct file *, loff_t, int);
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 /* Lookups */
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@@ -200,19 +207,19 @@
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  * inode.c
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  */
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 struct pde_opener {
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-	struct file *file;
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 	struct list_head lh;
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+	struct file *file;
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 	bool closing;
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 	struct completion *c;
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 } __randomize_layout;
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 extern const struct inode_operations proc_link_inode_operations;
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-
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 extern const struct inode_operations proc_pid_link_inode_operations;
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+extern const struct super_operations proc_sops;
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 void proc_init_kmemcache(void);
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+void proc_invalidate_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock);
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 void set_proc_pid_nlink(void);
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 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
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-extern int proc_fill_super(struct super_block *);
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 extern void proc_entry_rundown(struct proc_dir_entry *);
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 /*
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@@ -258,15 +265,6 @@
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 #endif
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 /*
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- * uid.c
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- */
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-#ifdef CONFIG_PROC_UID
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-extern int proc_uid_init(void);
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-#else
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-static inline void proc_uid_init(void) { }
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-#endif
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-
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-/*
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  * proc_tty.c
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  */
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 #ifdef CONFIG_TTY
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@@ -281,7 +279,6 @@
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 extern struct proc_dir_entry proc_root;
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 extern void proc_self_init(void);
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-extern int proc_remount(struct super_block *, int *, char *);
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 /*
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  * task_[no]mmu.c