mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Alexey Dobriyan](/assets/img/avatar_default.png)
Currently core /proc code uses "struct file_operations" for custom hooks, however, VFS doesn't directly call them. Every time VFS expands file_operations hook set, /proc code bloats for no reason. Introduce "struct proc_ops" which contains only those hooks which /proc allows to call into (open, release, read, write, ioctl, mmap, poll). It doesn't contain module pointer as well. Save ~184 bytes per usage: add/remove: 26/26 grow/shrink: 1/4 up/down: 1922/-6674 (-4752) Function old new delta sysvipc_proc_ops - 72 +72 ... config_gz_proc_ops - 72 +72 proc_get_inode 289 339 +50 proc_reg_get_unmapped_area 110 107 -3 close_pdeo 227 224 -3 proc_reg_open 289 284 -5 proc_create_data 60 53 -7 rt_cpu_seq_fops 256 - -256 ... default_affinity_proc_fops 256 - -256 Total: Before=5430095, After=5425343, chg -0.09% Link: http://lkml.kernel.org/r/20191225172228.GA13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
304 lines
8.5 KiB
C
304 lines
8.5 KiB
C
/* 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 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))
|
|
|
|
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 sysctl_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 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 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 *);
|