/* -*- 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 /* * 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); void autofs_kill_sb(struct super_block *sb); /* 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