77b14db502
With this change the sysctl inodes can be cached and nothing needs to be done when removing a sysctl table. For a cost of 2K code we will save about 4K of static tables (when we remove de from ctl_table) and 70K in proc_dir_entries that we will not allocate, or about half that on a 32bit arch. The speed feels about the same, even though we can now cache the sysctl dentries :( We get the core advantage that we don't need to have a 1 to 1 mapping between ctl table entries and proc files. Making it possible to have /proc/sys vary depending on the namespace you are in. The currently merged namespaces don't have an issue here but the network namespace under /proc/sys/net needs to have different directories depending on which network adapters are visible. By simply being a cache different directories being visible depending on who you are is trivial to implement. [akpm@osdl.org: fix uninitialised var] [akpm@osdl.org: fix ARM build] [bunk@stusta.de: make things static] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
70 lines
2 KiB
C
70 lines
2 KiB
C
/* internal.h: internal procfs definitions
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
extern int proc_sys_init(void);
|
|
|
|
struct vmalloc_info {
|
|
unsigned long used;
|
|
unsigned long largest_chunk;
|
|
};
|
|
|
|
#ifdef CONFIG_MMU
|
|
#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
|
|
extern void get_vmalloc_info(struct vmalloc_info *vmi);
|
|
#else
|
|
|
|
#define VMALLOC_TOTAL 0UL
|
|
#define get_vmalloc_info(vmi) \
|
|
do { \
|
|
(vmi)->used = 0; \
|
|
(vmi)->largest_chunk = 0; \
|
|
} while(0)
|
|
|
|
extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *);
|
|
#endif
|
|
|
|
extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
|
|
extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **);
|
|
extern int proc_tid_stat(struct task_struct *, char *);
|
|
extern int proc_tgid_stat(struct task_struct *, char *);
|
|
extern int proc_pid_status(struct task_struct *, char *);
|
|
extern int proc_pid_statm(struct task_struct *, char *);
|
|
|
|
extern const struct file_operations proc_maps_operations;
|
|
extern const struct file_operations proc_numa_maps_operations;
|
|
extern const struct file_operations proc_smaps_operations;
|
|
|
|
extern const struct file_operations proc_maps_operations;
|
|
extern const struct file_operations proc_numa_maps_operations;
|
|
extern const struct file_operations proc_smaps_operations;
|
|
|
|
|
|
void free_proc_entry(struct proc_dir_entry *de);
|
|
|
|
int proc_init_inodecache(void);
|
|
|
|
static inline struct pid *proc_pid(struct inode *inode)
|
|
{
|
|
return PROC_I(inode)->pid;
|
|
}
|
|
|
|
static inline struct task_struct *get_proc_task(struct inode *inode)
|
|
{
|
|
return get_pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
}
|
|
|
|
static inline int proc_fd(struct inode *inode)
|
|
{
|
|
return PROC_I(inode)->fd;
|
|
}
|