mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
268 lines
7.2 KiB
C
268 lines
7.2 KiB
C
/* -*- 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/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 */
|
|
|
|
#ifdef DEBUG
|
|
#define DPRINTK(fmt, args...) \
|
|
do { \
|
|
printk(KERN_DEBUG "pid %d: %s: " fmt "\n", \
|
|
current->pid, __func__, ##args); \
|
|
} while (0)
|
|
#else
|
|
#define DPRINTK(fmt, args...) do {} while (0)
|
|
#endif
|
|
|
|
#define AUTOFS_WARN(fmt, args...) \
|
|
do { \
|
|
printk(KERN_WARNING "pid %d: %s: " fmt "\n", \
|
|
current->pid, __func__, ##args); \
|
|
} while (0)
|
|
|
|
#define AUTOFS_ERROR(fmt, args...) \
|
|
do { \
|
|
printk(KERN_ERR "pid %d: %s: " fmt "\n", \
|
|
current->pid, __func__, ##args); \
|
|
} while (0)
|
|
|
|
/* 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;
|
|
struct list_head expiring;
|
|
|
|
struct autofs_sb_info *sbi;
|
|
unsigned long last_used;
|
|
atomic_t count;
|
|
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
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 */
|
|
#define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */
|
|
|
|
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;
|
|
uid_t uid;
|
|
gid_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;
|
|
pid_t 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;
|
|
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;
|
|
};
|
|
|
|
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_nr(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);
|
|
|
|
if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
|
|
return 1;
|
|
|
|
if (inf->flags & AUTOFS_INF_EXPIRING)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void autofs4_copy_atime(struct file *src, struct file *dst)
|
|
{
|
|
dst->f_path.dentry->d_inode->i_atime =
|
|
src->f_path.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_wait(struct dentry *dentry);
|
|
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 inode_operations autofs4_root_inode_operations;
|
|
extern const struct inode_operations autofs4_indirect_root_inode_operations;
|
|
extern const struct inode_operations autofs4_direct_root_inode_operations;
|
|
extern const struct file_operations autofs4_dir_operations;
|
|
extern const 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 */
|
|
|
|
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 autofs4_follow_mount(struct path *path)
|
|
{
|
|
int res = 0;
|
|
|
|
while (d_mountpoint(path->dentry)) {
|
|
int followed = follow_down(path);
|
|
if (!followed)
|
|
break;
|
|
res = 1;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
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 sbi->sb->s_root->d_inode->i_ino;
|
|
}
|
|
|
|
static inline int simple_positive(struct dentry *dentry)
|
|
{
|
|
return dentry->d_inode && !d_unhashed(dentry);
|
|
}
|
|
|
|
static inline int __simple_empty(struct dentry *dentry)
|
|
{
|
|
struct dentry *child;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
|
|
if (simple_positive(child))
|
|
goto out;
|
|
ret = 1;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void autofs4_dentry_release(struct dentry *);
|
|
extern void autofs4_kill_sb(struct super_block *);
|