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