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