patch-2.1.31 linux/include/linux/auto_fs.h

• Lines: 178
• Date: Wed Apr 2 17:55:03 1997
• Orig file: v2.1.30/linux/include/linux/auto_fs.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.30/linux/include/linux/auto_fs.h linux/include/linux/auto_fs.h
@@ -0,0 +1,177 @@
+/* -*- linux-c -*- --------------------------------------------------------- *
+ *
+ * linux/include/linux/auto_fs.h
+ *
+ *  Copyright 1997 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.
+ *
+ * ------------------------------------------------------------------------- */
+
+
+#ifndef _LINUX_AUTO_FS_H
+#define _LINUX_AUTO_FS_H
+
+#include <linux/version.h>
+#include <linux/fs.h>
+#include <linux/limits.h>
+#include <linux/ioctl.h>
+#include <asm/types.h>
+
+#define AUTOFS_PROTO_VERSION 2
+
+enum autofs_packet_type {
+	autofs_ptype_missing,	/* Missing entry (create wait queue) */
+	/* ...need more in the future... */
+};
+
+struct autofs_packet_hdr {
+	int proto_version;	      /* Protocol version */
+	enum autofs_packet_type type; /* Type of packet */
+};
+
+struct autofs_packet_missing {
+	struct autofs_packet_hdr hdr;
+        unsigned long wait_queue_token;
+	int len;
+	char name[NAME_MAX+1];
+};	
+
+#define AUTOFS_IOC_READY     _IO(0x93,0x60)
+#define AUTOFS_IOC_FAIL      _IO(0x93,0x61)
+#define AUTOFS_IOC_CATATONIC _IO(0x93,0x62)
+
+#ifdef __KERNEL__
+
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+#if LINUX_VERSION_CODE < 0x20100
+
+#include <asm/segment.h>
+#define copy_to_user	memcpy_tofs
+#define copy_from_user	memcpy_fromfs
+
+#else
+
+#include <asm/uaccess.h>
+#define register_symtab(x)	do { } while (0)
+
+#endif
+
+#ifndef DPRINTK
+#ifdef DEBUG
+#define DPRINTK(D) printk D;
+#else
+#define DPRINTK(D)
+#endif
+#endif
+
+#define AUTOFS_SUPER_MAGIC 0x0187
+
+/* Structures associated with the root directory hash */
+
+#define AUTOFS_HASH_SIZE 67
+
+typedef u32 autofs_hash_t;	/* Type returned by autofs_hash() */
+
+struct autofs_dir_ent {
+	autofs_hash_t hash;
+	struct autofs_dir_ent *next;
+	struct autofs_dir_ent **back;
+	char *name;
+	int len;
+	ino_t ino;
+	time_t expiry;		/* Reserved for use in failed-lookup cache */
+};
+
+struct autofs_dirhash {
+	struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
+};
+
+struct autofs_wait_queue {
+	unsigned long wait_queue_token;
+	struct wait_queue *queue;
+	struct autofs_wait_queue *next;
+	/* We use the following to see what we are waiting for */
+	autofs_hash_t hash;
+	int len;
+	char *name;
+	/* This is for status reporting upon return */
+	int status;
+	int wait_ctr;
+};
+
+struct autofs_symlink {
+	int len;
+	char *data;
+	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+31)/32)
+
+#ifndef END_OF_TIME
+#define END_OF_TIME ((time_t)((unsigned long)((time_t)(~0UL)) >> 1))
+#endif
+
+struct autofs_sb_info {
+	struct file *pipe;
+	pid_t oz_pgrp;
+	int catatonic;
+	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];
+	u32 symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
+};
+
+/* autofs_oz_mode(): do we see the man behind the curtain? */
+static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
+	return sbi->catatonic || current->pgrp == sbi->oz_pgrp;
+}
+
+/* Init function */
+int init_autofs_fs(void);
+
+/* Hash operations */
+
+autofs_hash_t autofs_hash(const char *,int);
+void autofs_initialize_hash(struct autofs_dirhash *);
+struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,autofs_hash_t,const char *,int);
+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 *);
+void autofs_hash_nuke(struct autofs_dirhash *);
+
+/* 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;
+
+/* Initializing function */
+
+struct super_block *autofs_read_super(struct super_block *, void *,int);
+
+/* Queue management functions */
+
+int autofs_wait(struct autofs_sb_info *,autofs_hash_t,const char *,int);
+int autofs_wait_release(struct autofs_sb_info *,unsigned long,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)
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_AUTO_FS_H */