autofs_i.h
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上传日期:2013-02-24
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- /* -*- 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/sched.h>
- #include <linux/string.h>
- #include <linux/wait.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;
- 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->u.generic_sbp);
- }
- /* 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 || current->pgrp == 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_dirhash *);
- /* 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 struct inode_operations autofs_dir_inode_operations;
- extern struct file_operations autofs_root_operations;
- extern struct file_operations autofs_dir_operations;
- /* Initializing function */
- struct super_block *autofs_read_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