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authorH. Peter Anvin <hpa@zytor.com>1997-10-06 21:27:09 +0000
committerH. Peter Anvin <hpa@zytor.com>1997-10-06 21:27:09 +0000
commit93aa1d55b4ffe513fb10d897dd52a09165484e4e (patch)
treeb7c45bd4579a285261ab11c0557e99e4b3f8037d /kernel/autofs_i.h
parent6919185c2ea948793620b5acc57721a65c631710 (diff)
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Added kernel code to CVS repository
Diffstat (limited to 'kernel/autofs_i.h')
-rw-r--r--kernel/autofs_i.h154
1 files changed, 154 insertions, 0 deletions
diff --git a/kernel/autofs_i.h b/kernel/autofs_i.h
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+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ * linux/fs/autofs/autofs_i.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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/* 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/malloc.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;
+ struct autofs_dir_ent *next;
+ struct autofs_dir_ent **back;
+ char *name;
+ int len;
+ ino_t ino;
+ /* The following entries are for the expiry system */
+ unsigned long last_usage;
+ struct autofs_dir_ent *exp_next;
+ struct autofs_dir_ent *exp_prev;
+};
+
+struct autofs_dirhash {
+ struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
+ struct autofs_dir_ent expiry_head;
+};
+
+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 */
+ int 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
+
+#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];
+ u32 symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
+};
+
+/* 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 *);
+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 autofs_dirhash *,unsigned long);
+
+/* 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 *,struct qstr *);
+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) ((void)0)
+#endif