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-rw-r--r--fs/proc/internal.h319
1 files changed, 319 insertions, 0 deletions
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
new file mode 100644
index 000000000..afbe96b6b
--- /dev/null
+++ b/fs/proc/internal.h
@@ -0,0 +1,319 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Internal procfs definitions
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/proc_fs.h>
+#include <linux/proc_ns.h>
+#include <linux/refcount.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+#include <linux/binfmts.h>
+#include <linux/sched/coredump.h>
+#include <linux/sched/task.h>
+
+struct ctl_table_header;
+struct mempolicy;
+
+/*
+ * This is not completely implemented yet. The idea is to
+ * create an in-memory tree (like the actual /proc filesystem
+ * tree) of these proc_dir_entries, so that we can dynamically
+ * add new files to /proc.
+ *
+ * parent/subdir are used for the directory structure (every /proc file has a
+ * parent, but "subdir" is empty for all non-directory entries).
+ * subdir_node is used to build the rb tree "subdir" of the parent.
+ */
+struct proc_dir_entry {
+ /*
+ * number of callers into module in progress;
+ * negative -> it's going away RSN
+ */
+ atomic_t in_use;
+ refcount_t refcnt;
+ struct list_head pde_openers; /* who did ->open, but not ->release */
+ /* protects ->pde_openers and all struct pde_opener instances */
+ spinlock_t pde_unload_lock;
+ struct completion *pde_unload_completion;
+ const struct inode_operations *proc_iops;
+ union {
+ const struct proc_ops *proc_ops;
+ const struct file_operations *proc_dir_ops;
+ };
+ const struct dentry_operations *proc_dops;
+ union {
+ const struct seq_operations *seq_ops;
+ int (*single_show)(struct seq_file *, void *);
+ };
+ proc_write_t write;
+ void *data;
+ unsigned int state_size;
+ unsigned int low_ino;
+ nlink_t nlink;
+ kuid_t uid;
+ kgid_t gid;
+ loff_t size;
+ struct proc_dir_entry *parent;
+ struct rb_root subdir;
+ struct rb_node subdir_node;
+ char *name;
+ umode_t mode;
+ u8 flags;
+ u8 namelen;
+ char inline_name[];
+} __randomize_layout;
+
+#define SIZEOF_PDE ( \
+ sizeof(struct proc_dir_entry) < 128 ? 128 : \
+ sizeof(struct proc_dir_entry) < 192 ? 192 : \
+ sizeof(struct proc_dir_entry) < 256 ? 256 : \
+ sizeof(struct proc_dir_entry) < 512 ? 512 : \
+ 0)
+#define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry))
+
+static inline bool pde_is_permanent(const struct proc_dir_entry *pde)
+{
+ return pde->flags & PROC_ENTRY_PERMANENT;
+}
+
+extern struct kmem_cache *proc_dir_entry_cache;
+void pde_free(struct proc_dir_entry *pde);
+
+union proc_op {
+ int (*proc_get_link)(struct dentry *, struct path *);
+ int (*proc_show)(struct seq_file *m,
+ struct pid_namespace *ns, struct pid *pid,
+ struct task_struct *task);
+ const char *lsm;
+};
+
+struct proc_inode {
+ struct pid *pid;
+ unsigned int fd;
+ union proc_op op;
+ struct proc_dir_entry *pde;
+ struct ctl_table_header *sysctl;
+ struct ctl_table *sysctl_entry;
+ struct hlist_node sibling_inodes;
+ const struct proc_ns_operations *ns_ops;
+ struct inode vfs_inode;
+} __randomize_layout;
+
+/*
+ * General functions
+ */
+static inline struct proc_inode *PROC_I(const struct inode *inode)
+{
+ return container_of(inode, struct proc_inode, vfs_inode);
+}
+
+static inline struct proc_dir_entry *PDE(const struct inode *inode)
+{
+ return PROC_I(inode)->pde;
+}
+
+static inline void *__PDE_DATA(const struct inode *inode)
+{
+ return PDE(inode)->data;
+}
+
+static inline struct pid *proc_pid(const struct inode *inode)
+{
+ return PROC_I(inode)->pid;
+}
+
+static inline struct task_struct *get_proc_task(const struct inode *inode)
+{
+ return get_pid_task(proc_pid(inode), PIDTYPE_PID);
+}
+
+void task_dump_owner(struct task_struct *task, umode_t mode,
+ kuid_t *ruid, kgid_t *rgid);
+
+unsigned name_to_int(const struct qstr *qstr);
+/*
+ * Offset of the first process in the /proc root directory..
+ */
+#define FIRST_PROCESS_ENTRY 256
+
+/* Worst case buffer size needed for holding an integer. */
+#define PROC_NUMBUF 13
+
+/*
+ * array.c
+ */
+extern const struct file_operations proc_tid_children_operations;
+
+extern void proc_task_name(struct seq_file *m, struct task_struct *p,
+ bool escape);
+extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
+ struct pid *, struct task_struct *);
+extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
+ struct pid *, struct task_struct *);
+extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
+ struct pid *, struct task_struct *);
+extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
+ struct pid *, struct task_struct *);
+
+/*
+ * base.c
+ */
+extern const struct dentry_operations pid_dentry_operations;
+extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
+extern int proc_setattr(struct dentry *, struct iattr *);
+extern void proc_pid_evict_inode(struct proc_inode *);
+extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
+extern void pid_update_inode(struct task_struct *, struct inode *);
+extern int pid_delete_dentry(const struct dentry *);
+extern int proc_pid_readdir(struct file *, struct dir_context *);
+struct dentry *proc_pid_lookup(struct dentry *, unsigned int);
+extern loff_t mem_lseek(struct file *, loff_t, int);
+
+/* Lookups */
+typedef struct dentry *instantiate_t(struct dentry *,
+ struct task_struct *, const void *);
+bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int,
+ instantiate_t, struct task_struct *, const void *);
+
+/*
+ * generic.c
+ */
+struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
+ struct proc_dir_entry **parent, void *data);
+struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
+ struct proc_dir_entry *dp);
+extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
+struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
+extern int proc_readdir(struct file *, struct dir_context *);
+int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
+
+static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
+{
+ refcount_inc(&pde->refcnt);
+ return pde;
+}
+extern void pde_put(struct proc_dir_entry *);
+
+static inline bool is_empty_pde(const struct proc_dir_entry *pde)
+{
+ return S_ISDIR(pde->mode) && !pde->proc_iops;
+}
+extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, loff_t *);
+
+/*
+ * inode.c
+ */
+struct pde_opener {
+ struct list_head lh;
+ struct file *file;
+ bool closing;
+ struct completion *c;
+} __randomize_layout;
+extern const struct inode_operations proc_link_inode_operations;
+extern const struct inode_operations proc_pid_link_inode_operations;
+extern const struct super_operations proc_sops;
+
+void proc_init_kmemcache(void);
+void proc_invalidate_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock);
+void set_proc_pid_nlink(void);
+extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
+extern void proc_entry_rundown(struct proc_dir_entry *);
+
+/*
+ * proc_namespaces.c
+ */
+extern const struct inode_operations proc_ns_dir_inode_operations;
+extern const struct file_operations proc_ns_dir_operations;
+
+/*
+ * proc_net.c
+ */
+extern const struct file_operations proc_net_operations;
+extern const struct inode_operations proc_net_inode_operations;
+
+#ifdef CONFIG_NET
+extern int proc_net_init(void);
+#else
+static inline int proc_net_init(void) { return 0; }
+#endif
+
+/*
+ * proc_self.c
+ */
+extern int proc_setup_self(struct super_block *);
+
+/*
+ * proc_thread_self.c
+ */
+extern int proc_setup_thread_self(struct super_block *);
+extern void proc_thread_self_init(void);
+
+/*
+ * proc_sysctl.c
+ */
+#ifdef CONFIG_PROC_SYSCTL
+extern int proc_sys_init(void);
+extern void proc_sys_evict_inode(struct inode *inode,
+ struct ctl_table_header *head);
+#else
+static inline void proc_sys_init(void) { }
+static inline void proc_sys_evict_inode(struct inode *inode,
+ struct ctl_table_header *head) { }
+#endif
+
+/*
+ * proc_tty.c
+ */
+#ifdef CONFIG_TTY
+extern void proc_tty_init(void);
+#else
+static inline void proc_tty_init(void) {}
+#endif
+
+/*
+ * root.c
+ */
+extern struct proc_dir_entry proc_root;
+
+extern void proc_self_init(void);
+
+/*
+ * task_[no]mmu.c
+ */
+struct mem_size_stats;
+struct proc_maps_private {
+ struct inode *inode;
+ struct task_struct *task;
+ struct mm_struct *mm;
+#ifdef CONFIG_MMU
+ struct vm_area_struct *tail_vma;
+#endif
+#ifdef CONFIG_NUMA
+ struct mempolicy *task_mempolicy;
+#endif
+} __randomize_layout;
+
+struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
+
+extern const struct file_operations proc_pid_maps_operations;
+extern const struct file_operations proc_pid_numa_maps_operations;
+extern const struct file_operations proc_pid_smaps_operations;
+extern const struct file_operations proc_pid_smaps_rollup_operations;
+extern const struct file_operations proc_clear_refs_operations;
+extern const struct file_operations proc_pagemap_operations;
+
+extern unsigned long task_vsize(struct mm_struct *);
+extern unsigned long task_statm(struct mm_struct *,
+ unsigned long *, unsigned long *,
+ unsigned long *, unsigned long *);
+extern void task_mem(struct seq_file *, struct mm_struct *);
+
+extern const struct dentry_operations proc_net_dentry_ops;
+static inline void pde_force_lookup(struct proc_dir_entry *pde)
+{
+ /* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */
+ pde->proc_dops = &proc_net_dentry_ops;
+}