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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/autofs4/autofs_i.h
downloadlinux-linaro-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/autofs4/autofs_i.h')
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1 files changed, 193 insertions, 0 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
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+++ b/fs/autofs4/autofs_i.h
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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/time.h>
+#include <linux/string.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+
+/* #define DEBUG */
+
+#ifdef DEBUG
+#define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __FUNCTION__ , ##args); } while(0)
+#else
+#define DPRINTK(fmt,args...) 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;
+ atomic_t wait_ctr;
+};
+
+#define AUTOFS_SBI_MAGIC 0x6d4a556d
+
+struct autofs_sb_info {
+ u32 magic;
+ struct file *pipe;
+ pid_t oz_pgrp;
+ int catatonic;
+ int version;
+ int sub_version;
+ unsigned long exp_timeout;
+ int reghost_enabled;
+ int needs_reghost;
+ struct super_block *sb;
+ struct semaphore wq_sem;
+ 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->s_fs_info);
+}
+
+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 || process_group(current) == 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);
+}
+
+static inline void autofs4_copy_atime(struct file *src, struct file *dst)
+{
+ dst->f_dentry->d_inode->i_atime = src->f_dentry->d_inode->i_atime;
+ return;
+}
+
+struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
+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 __user *);
+int autofs4_expire_multi(struct super_block *, struct vfsmount *,
+ struct autofs_sb_info *, int __user *);
+
+/* 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 */
+
+int autofs4_fill_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 dentry *, enum autofs_notify);
+int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
+void autofs4_catatonic_mode(struct autofs_sb_info *);
+
+static inline int simple_positive(struct dentry *dentry)
+{
+ return dentry->d_inode && !d_unhashed(dentry);
+}
+
+static inline int simple_empty_nolock(struct dentry *dentry)
+{
+ struct dentry *child;
+ int ret = 0;
+
+ list_for_each_entry(child, &dentry->d_subdirs, d_child)
+ if (simple_positive(child))
+ goto out;
+ ret = 1;
+out:
+ return ret;
+}