166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* linux/fs/autofs/autofs_i.h
|
|
*
|
|
* Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel and is made available under
|
|
* the terms of the GNU General Public License, version 2, or at your
|
|
* option, any later version, incorporated herein by reference.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/* Internal header file for autofs */
|
|
|
|
#include <linux/auto_fs.h>
|
|
|
|
/* This is the range of ioctl() numbers we claim as ours */
|
|
#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
|
|
#define AUTOFS_IOC_COUNT 32
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/time.h>
|
|
#include <linux/string.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/dcache.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/current.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#ifdef DEBUG
|
|
#define DPRINTK(D) (printk D)
|
|
#else
|
|
#define DPRINTK(D) ((void)0)
|
|
#endif
|
|
|
|
#define AUTOFS_SUPER_MAGIC 0x0187
|
|
|
|
/*
|
|
* If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
|
|
* kernel will keep the negative response cached for up to the time given
|
|
* here, although the time can be shorter if the kernel throws the dcache
|
|
* entry away. This probably should be settable from user space.
|
|
*/
|
|
#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
|
|
|
|
/* Structures associated with the root directory hash table */
|
|
|
|
#define AUTOFS_HASH_SIZE 67
|
|
|
|
struct autofs_dir_ent {
|
|
int hash;
|
|
char *name;
|
|
int len;
|
|
ino_t ino;
|
|
struct dentry *dentry;
|
|
/* Linked list of entries */
|
|
struct autofs_dir_ent *next;
|
|
struct autofs_dir_ent **back;
|
|
/* The following entries are for the expiry system */
|
|
unsigned long last_usage;
|
|
struct list_head exp;
|
|
};
|
|
|
|
struct autofs_dirhash {
|
|
struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
|
|
struct list_head expiry_head;
|
|
};
|
|
|
|
struct autofs_wait_queue {
|
|
wait_queue_head_t queue;
|
|
struct autofs_wait_queue *next;
|
|
autofs_wqt_t wait_queue_token;
|
|
/* We use the following to see what we are waiting for */
|
|
int hash;
|
|
int len;
|
|
char *name;
|
|
/* This is for status reporting upon return */
|
|
int status;
|
|
int wait_ctr;
|
|
};
|
|
|
|
struct autofs_symlink {
|
|
char *data;
|
|
int len;
|
|
time_t mtime;
|
|
};
|
|
|
|
#define AUTOFS_MAX_SYMLINKS 256
|
|
|
|
#define AUTOFS_ROOT_INO 1
|
|
#define AUTOFS_FIRST_SYMLINK 2
|
|
#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS)
|
|
|
|
#define AUTOFS_SYMLINK_BITMAP_LEN \
|
|
((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8))
|
|
|
|
#define AUTOFS_SBI_MAGIC 0x6d4a556d
|
|
|
|
struct autofs_sb_info {
|
|
u32 magic;
|
|
struct file *pipe;
|
|
pid_t oz_pgrp;
|
|
int catatonic;
|
|
struct super_block *sb;
|
|
unsigned long exp_timeout;
|
|
ino_t next_dir_ino;
|
|
struct autofs_wait_queue *queues; /* Wait queue pointer */
|
|
struct autofs_dirhash dirhash; /* Root directory hash */
|
|
struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS];
|
|
unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
|
|
};
|
|
|
|
static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
|
|
{
|
|
return (struct autofs_sb_info *)(sb->s_fs_info);
|
|
}
|
|
|
|
/* autofs_oz_mode(): do we see the man behind the curtain? (The
|
|
processes which do manipulations for us in user space sees the raw
|
|
filesystem without "magic".) */
|
|
|
|
static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
|
|
return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
|
|
}
|
|
|
|
/* Hash operations */
|
|
|
|
void autofs_initialize_hash(struct autofs_dirhash *);
|
|
struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *);
|
|
void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *);
|
|
void autofs_hash_delete(struct autofs_dir_ent *);
|
|
struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *);
|
|
void autofs_hash_dputall(struct autofs_dirhash *);
|
|
void autofs_hash_nuke(struct autofs_sb_info *);
|
|
|
|
/* Expiration-handling functions */
|
|
|
|
void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *);
|
|
struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt);
|
|
|
|
/* Operations structures */
|
|
|
|
extern struct inode_operations autofs_root_inode_operations;
|
|
extern struct inode_operations autofs_symlink_inode_operations;
|
|
extern const struct file_operations autofs_root_operations;
|
|
|
|
/* Initializing function */
|
|
|
|
int autofs_fill_super(struct super_block *, void *, int);
|
|
|
|
/* Queue management functions */
|
|
|
|
int autofs_wait(struct autofs_sb_info *,struct qstr *);
|
|
int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
|
|
void autofs_catatonic_mode(struct autofs_sb_info *);
|
|
|
|
#ifdef DEBUG
|
|
void autofs_say(const char *name, int len);
|
|
#else
|
|
#define autofs_say(n,l) ((void)0)
|
|
#endif
|