Initial import

1 files changed, 283 insertions, 0 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
new file mode 100644
index 000000000..5b700ef1e
--- /dev/null
+++ b/fs/autofs4/autofs_i.h
@@ -0,0 +1,283 @@
+/* -*- c -*- ------------------------------------------------------------- *
+ *   
+ * linux/fs/autofs/autofs_i.h
+ *
+ *   Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
+ *   Copyright 2005-2006 Ian Kent <raven@themaw.net>
+ *
+ * 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/auto_dev-ioctl.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.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
+
+#define AUTOFS_DEV_IOCTL_IOC_FIRST	(AUTOFS_DEV_IOCTL_VERSION)
+#define AUTOFS_DEV_IOCTL_IOC_COUNT	(AUTOFS_IOC_COUNT - 11)
+
+#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 */
+
+#define DPRINTK(fmt, ...)				\
+	pr_debug("pid %d: %s: " fmt "\n",		\
+		current->pid, __func__, ##__VA_ARGS__)
+
+#define AUTOFS_WARN(fmt, ...)				\
+	printk(KERN_WARNING "pid %d: %s: " fmt "\n",	\
+		current->pid, __func__, ##__VA_ARGS__)
+
+#define AUTOFS_ERROR(fmt, ...)				\
+	printk(KERN_ERR "pid %d: %s: " fmt "\n",	\
+		current->pid, __func__, ##__VA_ARGS__)
+
+/* 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 completion expire_complete;
+
+	struct list_head active;
+	int active_count;
+
+	struct list_head expiring;
+
+	struct autofs_sb_info *sbi;
+	unsigned long last_used;
+	atomic_t count;
+
+	kuid_t uid;
+	kgid_t gid;
+};
+
+#define AUTOFS_INF_EXPIRING	(1<<0) /* dentry is in the process of expiring */
+#define AUTOFS_INF_NO_RCU	(1<<1) /* the dentry is being considered
+					* for expiry, so RCU_walk is
+					* not permitted
+					*/
+#define AUTOFS_INF_PENDING	(1<<2) /* dentry pending mount */
+
+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 */
+	struct qstr name;
+	u32 dev;
+	u64 ino;
+	kuid_t uid;
+	kgid_t gid;
+	pid_t pid;
+	pid_t tgid;
+	/* This is for status reporting upon return */
+	int status;
+	unsigned int wait_ctr;
+};
+
+#define AUTOFS_SBI_MAGIC 0x6d4a556d
+
+struct autofs_sb_info {
+	u32 magic;
+	int pipefd;
+	struct file *pipe;
+	struct pid *oz_pgrp;
+	int catatonic;
+	int version;
+	int sub_version;
+	int min_proto;
+	int max_proto;
+	unsigned long exp_timeout;
+	unsigned int type;
+	int reghost_enabled;
+	int needs_reghost;
+	struct super_block *sb;
+	struct mutex wq_mutex;
+	struct mutex pipe_mutex;
+	spinlock_t fs_lock;
+	struct autofs_wait_queue *queues; /* Wait queue pointer */
+	spinlock_t lookup_lock;
+	struct list_head active_list;
+	struct list_head expiring_list;
+	struct rcu_head rcu;
+};
+
+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 || task_pgrp(current) == sbi->oz_pgrp;
+}
+
+struct inode *autofs4_get_inode(struct super_block *, umode_t);
+void autofs4_free_ino(struct autofs_info *);
+
+/* Expiration */
+int is_autofs4_dentry(struct dentry *);
+int autofs4_expire_wait(struct dentry *dentry, int rcu_walk);
+int autofs4_expire_run(struct super_block *, struct vfsmount *,
+			struct autofs_sb_info *,
+			struct autofs_packet_expire __user *);
+int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
+			    struct autofs_sb_info *sbi, int when);
+int autofs4_expire_multi(struct super_block *, struct vfsmount *,
+			struct autofs_sb_info *, int __user *);
+struct dentry *autofs4_expire_direct(struct super_block *sb,
+				     struct vfsmount *mnt,
+				     struct autofs_sb_info *sbi, int how);
+struct dentry *autofs4_expire_indirect(struct super_block *sb,
+				       struct vfsmount *mnt,
+				       struct autofs_sb_info *sbi, int how);
+
+/* Device node initialization */
+
+int autofs_dev_ioctl_init(void);
+void autofs_dev_ioctl_exit(void);
+
+/* Operations structures */
+
+extern const struct inode_operations autofs4_symlink_inode_operations;
+extern const struct inode_operations autofs4_dir_inode_operations;
+extern const struct file_operations autofs4_dir_operations;
+extern const struct file_operations autofs4_root_operations;
+extern const struct dentry_operations autofs4_dentry_operations;
+
+/* VFS automount flags management functions */
+static inline void __managed_dentry_set_managed(struct dentry *dentry)
+{
+	dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
+}
+
+static inline void managed_dentry_set_managed(struct dentry *dentry)
+{
+	spin_lock(&dentry->d_lock);
+	__managed_dentry_set_managed(dentry);
+	spin_unlock(&dentry->d_lock);
+}
+
+static inline void __managed_dentry_clear_managed(struct dentry *dentry)
+{
+	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
+}
+
+static inline void managed_dentry_clear_managed(struct dentry *dentry)
+{
+	spin_lock(&dentry->d_lock);
+	__managed_dentry_clear_managed(dentry);
+	spin_unlock(&dentry->d_lock);
+}
+
+/* Initializing function */
+
+int autofs4_fill_super(struct super_block *, void *, int);
+struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
+void autofs4_clean_ino(struct autofs_info *);
+
+static inline int autofs_prepare_pipe(struct file *pipe)
+{
+	if (!(pipe->f_mode & FMODE_CAN_WRITE))
+		return -EINVAL;
+	if (!S_ISFIFO(file_inode(pipe)->i_mode))
+		return -EINVAL;
+	/* We want a packet pipe */
+	pipe->f_flags |= O_DIRECT;
+	return 0;
+}
+
+/* Queue management functions */
+
+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 u32 autofs4_get_dev(struct autofs_sb_info *sbi)
+{
+	return new_encode_dev(sbi->sb->s_dev);
+}
+
+static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
+{
+	return d_inode(sbi->sb->s_root)->i_ino;
+}
+
+static inline int simple_positive(struct dentry *dentry)
+{
+	return d_really_is_positive(dentry) && !d_unhashed(dentry);
+}
+
+static inline void __autofs4_add_expiring(struct dentry *dentry)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	if (ino) {
+		if (list_empty(&ino->expiring))
+			list_add(&ino->expiring, &sbi->expiring_list);
+	}
+	return;
+}
+
+static inline void autofs4_add_expiring(struct dentry *dentry)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	if (ino) {
+		spin_lock(&sbi->lookup_lock);
+		if (list_empty(&ino->expiring))
+			list_add(&ino->expiring, &sbi->expiring_list);
+		spin_unlock(&sbi->lookup_lock);
+	}
+	return;
+}
+
+static inline void autofs4_del_expiring(struct dentry *dentry)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	if (ino) {
+		spin_lock(&sbi->lookup_lock);
+		if (!list_empty(&ino->expiring))
+			list_del_init(&ino->expiring);
+		spin_unlock(&sbi->lookup_lock);
+	}
+	return;
+}
+
+extern void autofs4_kill_sb(struct super_block *);