autofs_i.h
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上传日期:2013-02-24
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- /* -*- 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_fs4.h>
- #include <linux/list.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>
- /* #define DEBUG */
- #ifdef DEBUG
- #define DPRINTK(D) do{ printk("pid %d: ", current->pid); printk D; } while(0)
- #else
- #define DPRINTK(D) do {} while(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 */
- /* Unified info structure. This is pointed to by both the dentry and
- inode structures. Each file in the filesystem has an instance of this
- structure. It holds a reference to the dentry, so dentries are never
- flushed while the file exists. All name lookups are dealt with at the
- dentry level, although the filesystem can interfere in the validation
- process. Readdir is implemented by traversing the dentry lists. */
- struct autofs_info {
- struct dentry *dentry;
- struct inode *inode;
- int flags;
- struct autofs_sb_info *sbi;
- unsigned long last_used;
- mode_t mode;
- size_t size;
- void (*free)(struct autofs_info *);
- union {
- const char *symlink;
- } u;
- };
- #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
- 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;
- };
- #define AUTOFS_SBI_MAGIC 0x6d4a556d
- struct autofs_sb_info {
- u32 magic;
- struct file *pipe;
- pid_t oz_pgrp;
- int catatonic;
- int version;
- unsigned long exp_timeout;
- struct super_block *sb;
- struct autofs_wait_queue *queues; /* Wait queue pointer */
- };
- static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
- {
- return (struct autofs_sb_info *)(sb->u.generic_sbp);
- }
- static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
- {
- return (struct autofs_info *)(dentry->d_fsdata);
- }
- /* autofs4_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 autofs4_oz_mode(struct autofs_sb_info *sbi) {
- return sbi->catatonic || current->pgrp == sbi->oz_pgrp;
- }
- /* Does a dentry have some pending activity? */
- static inline int autofs4_ispending(struct dentry *dentry)
- {
- struct autofs_info *inf = autofs4_dentry_ino(dentry);
- return (dentry->d_flags & DCACHE_AUTOFS_PENDING) ||
- (inf != NULL && inf->flags & AUTOFS_INF_EXPIRING);
- }
- struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
- struct autofs_info *autofs4_init_inf(struct autofs_sb_info *, mode_t mode);
- void autofs4_free_ino(struct autofs_info *);
- /* Expiration */
- int is_autofs4_dentry(struct dentry *);
- int autofs4_expire_run(struct super_block *, struct vfsmount *,
- struct autofs_sb_info *, struct autofs_packet_expire *);
- int autofs4_expire_multi(struct super_block *, struct vfsmount *,
- struct autofs_sb_info *, int *);
- /* Operations structures */
- extern struct inode_operations autofs4_symlink_inode_operations;
- extern struct inode_operations autofs4_dir_inode_operations;
- extern struct inode_operations autofs4_root_inode_operations;
- extern struct file_operations autofs4_dir_operations;
- extern struct file_operations autofs4_root_operations;
- /* Initializing function */
- struct super_block *autofs4_read_super(struct super_block *, void *,int);
- struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
- /* Queue management functions */
- enum autofs_notify
- {
- NFY_NONE,
- NFY_MOUNT,
- NFY_EXPIRE
- };
- int autofs4_wait(struct autofs_sb_info *,struct qstr *, enum autofs_notify);
- int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
- void autofs4_catatonic_mode(struct autofs_sb_info *);