patch-2.3.41 linux/fs/autofs4/autofs_i.h

• Lines: 176
• Date: Fri Jan 28 08:01:56 2000
• Orig file: v2.3.40/linux/fs/autofs4/autofs_i.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.40/linux/fs/autofs4/autofs_i.h linux/fs/autofs4/autofs_i.h
@@ -0,0 +1,175 @@
+/* -*- 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>
+#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/malloc.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;
+	struct list_head ino_hash;
+	unsigned long last_used;
+
+	ino_t	ino;
+	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_inohash {
+	struct list_head 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;
+};
+
+#define AUTOFS_ROOT_INO		1
+#define AUTOFS_FIRST_INO	2
+
+#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;
+	ino_t next_ino;
+	struct super_block *sb;
+	struct autofs_wait_queue *queues; /* Wait queue pointer */
+	struct autofs_inohash ihash;
+};
+
+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);
+}
+
+/* Inode hash operations */
+void autofs4_init_ihash(struct autofs_inohash *);
+void autofs4_ihash_insert(struct autofs_inohash *ih, struct autofs_info *ino);
+void autofs4_ihash_delete(struct autofs_info *ino);
+void autofs4_ihash_nuke(struct autofs_inohash *ih);
+struct autofs_info *autofs4_ihash_find(struct autofs_inohash *ih, ino_t ino);
+
+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 autofs_sb_info *,
+		      struct autofs_packet_expire *);
+int autofs4_expire_multi(struct super_block *, 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;
+
+/* 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 *);