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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#include <linux/fuse.h>
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
#include <asm/semaphore.h>
/** FUSE inode */
struct fuse_inode {
/** Inode data */
struct inode inode;
/** Unique ID, which identifies the inode between userspace
* and kernel */
u64 nodeid;
/** Time in jiffies until the file attributes are valid */
unsigned long i_time;
};
/**
* A Fuse connection.
*
* This structure is created, when the filesystem is mounted, and is
* destroyed, when the client device is closed and the filesystem is
* unmounted.
*/
struct fuse_conn {
/** The superblock of the mounted filesystem */
struct super_block *sb;
/** The user id for this mount */
uid_t user_id;
/** Backing dev info */
struct backing_dev_info bdi;
};
static inline struct fuse_conn **get_fuse_conn_super_p(struct super_block *sb)
{
return (struct fuse_conn **) &sb->s_fs_info;
}
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
{
return *get_fuse_conn_super_p(sb);
}
static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
{
return get_fuse_conn_super(inode->i_sb);
}
static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
{
return container_of(inode, struct fuse_inode, inode);
}
static inline u64 get_node_id(struct inode *inode)
{
return get_fuse_inode(inode)->nodeid;
}
/**
* This is the single global spinlock which protects FUSE's structures
*
* The following data is protected by this lock:
*
* - the s_fs_info field of the super block
* - the sb (super_block) field in fuse_conn
*/
extern spinlock_t fuse_lock;
/**
* Check if the connection can be released, and if yes, then free the
* connection structure
*/
void fuse_release_conn(struct fuse_conn *fc);
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