fs/fuse/fuse_i.h - kernel/msm - Gitiles

 /*
   FUSE: Filesystem in Userspace
   Copyright (C) 2001-2006  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/mount.h>
 #include <linux/wait.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
 #include <linux/backing-dev.h>
 #include <linux/mutex.h>

 /** Max number of pages that can be used in a single read request */
 #define FUSE_MAX_PAGES_PER_REQ 32

 /** Maximum number of outstanding background requests */
 #define FUSE_MAX_BACKGROUND 12

 /** Congestion starts at 75% of maximum */
 #define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100)

 /** It could be as large as PATH_MAX, but would that have any uses? */
 #define FUSE_NAME_MAX 1024

 /** Number of dentries for each connection in the control filesystem */
 #define FUSE_CTL_NUM_DENTRIES 3

 /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
     module will check permissions based on the file mode.  Otherwise no
     permission checking is done in the kernel */
 #define FUSE_DEFAULT_PERMISSIONS (1 << 0)

 /** If the FUSE_ALLOW_OTHER flag is given, then not only the user
     doing the mount will be allowed to access the filesystem */
 #define FUSE_ALLOW_OTHER         (1 << 1)

 /** List of active connections */
 extern struct list_head fuse_conn_list;

 /** Global mutex protecting fuse_conn_list and the control filesystem */
 extern struct mutex fuse_mutex;

 /** FUSE inode */
 struct fuse_inode {
 	/** Inode data */
 	struct inode inode;

 	/** Unique ID, which identifies the inode between userspace
 	 * and kernel */
 	u64 nodeid;

 	/** Number of lookups on this inode */
 	u64 nlookup;

 	/** The request used for sending the FORGET message */
 	struct fuse_req *forget_req;

 	/** Time in jiffies until the file attributes are valid */
 	u64 i_time;

 	/** The sticky bit in inode->i_mode may have been removed, so
 	    preserve the original mode */
 	mode_t orig_i_mode;
 };

 /** FUSE specific file data */
 struct fuse_file {
 	/** Request reserved for flush and release */
 	struct fuse_req *reserved_req;

 	/** File handle used by userspace */
 	u64 fh;

 	/** Refcount */
 	atomic_t count;
 };

 /** One input argument of a request */
 struct fuse_in_arg {
 	unsigned size;
 	const void *value;
 };

 /** The request input */
 struct fuse_in {
 	/** The request header */
 	struct fuse_in_header h;

 	/** True if the data for the last argument is in req->pages */
 	unsigned argpages:1;

 	/** Number of arguments */
 	unsigned numargs;

 	/** Array of arguments */
 	struct fuse_in_arg args[3];
 };

 /** One output argument of a request */
 struct fuse_arg {
 	unsigned size;
 	void *value;
 };

 /** The request output */
 struct fuse_out {
 	/** Header returned from userspace */
 	struct fuse_out_header h;

 	/*
 	 * The following bitfields are not changed during the request
 	 * processing
 	 */

 	/** Last argument is variable length (can be shorter than
 	    arg->size) */
 	unsigned argvar:1;

 	/** Last argument is a list of pages to copy data to */
 	unsigned argpages:1;

 	/** Zero partially or not copied pages */
 	unsigned page_zeroing:1;

 	/** Number or arguments */
 	unsigned numargs;

 	/** Array of arguments */
 	struct fuse_arg args[3];
 };

 /** The request state */
 enum fuse_req_state {
 	FUSE_REQ_INIT = 0,
 	FUSE_REQ_PENDING,
 	FUSE_REQ_READING,
 	FUSE_REQ_SENT,
 	FUSE_REQ_WRITING,
 	FUSE_REQ_FINISHED
 };

 struct fuse_conn;

 /**
  * A request to the client
  */
 struct fuse_req {
 	/** This can be on either pending processing or io lists in
 	    fuse_conn */
 	struct list_head list;

 	/** Entry on the interrupts list  */
 	struct list_head intr_entry;

 	/** refcount */
 	atomic_t count;

 	/** Unique ID for the interrupt request */
 	u64 intr_unique;

 	/*
 	 * The following bitfields are either set once before the
 	 * request is queued or setting/clearing them is protected by
 	 * fuse_conn->lock
 	 */

 	/** True if the request has reply */
 	unsigned isreply:1;

 	/** Force sending of the request even if interrupted */
 	unsigned force:1;

 	/** The request was aborted */
 	unsigned aborted:1;

 	/** Request is sent in the background */
 	unsigned background:1;

 	/** The request has been interrupted */
 	unsigned interrupted:1;

 	/** Data is being copied to/from the request */
 	unsigned locked:1;

 	/** Request is counted as "waiting" */
 	unsigned waiting:1;

 	/** State of the request */
 	enum fuse_req_state state;

 	/** The request input */
 	struct fuse_in in;

 	/** The request output */
 	struct fuse_out out;

 	/** Used to wake up the task waiting for completion of request*/
 	wait_queue_head_t waitq;

 	/** Data for asynchronous requests */
 	union {
 		struct fuse_forget_in forget_in;
 		struct fuse_release_in release_in;
 		struct fuse_init_in init_in;
 		struct fuse_init_out init_out;
 		struct fuse_read_in read_in;
 		struct fuse_lk_in lk_in;
 	} misc;

 	/** page vector */
 	struct page *pages[FUSE_MAX_PAGES_PER_REQ];

 	/** number of pages in vector */
 	unsigned num_pages;

 	/** offset of data on first page */
 	unsigned page_offset;

 	/** File used in the request (or NULL) */
 	struct fuse_file *ff;

 	/** vfsmount used in release */
 	struct vfsmount *vfsmount;

 	/** dentry used in release */
 	struct dentry *dentry;

 	/** Request completion callback */
 	void (*end)(struct fuse_conn *, struct fuse_req *);

 	/** Request is stolen from fuse_file->reserved_req */
 	struct file *stolen_file;
 };

 /**
  * 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 {
 	/** Lock protecting accessess to  members of this structure */
 	spinlock_t lock;

 	/** Mutex protecting against directory alias creation */
 	struct mutex inst_mutex;

 	/** Refcount */
 	atomic_t count;

 	/** The user id for this mount */
 	uid_t user_id;

 	/** The group id for this mount */
 	gid_t group_id;

 	/** The fuse mount flags for this mount */
 	unsigned flags;

 	/** Maximum read size */
 	unsigned max_read;

 	/** Maximum write size */
 	unsigned max_write;

 	/** Readers of the connection are waiting on this */
 	wait_queue_head_t waitq;

 	/** The list of pending requests */
 	struct list_head pending;

 	/** The list of requests being processed */
 	struct list_head processing;

 	/** The list of requests under I/O */
 	struct list_head io;

 	/** Number of requests currently in the background */
 	unsigned num_background;

 	/** Pending interrupts */
 	struct list_head interrupts;

 	/** Flag indicating if connection is blocked.  This will be
 	    the case before the INIT reply is received, and if there
 	    are too many outstading backgrounds requests */
 	int blocked;

 	/** waitq for blocked connection */
 	wait_queue_head_t blocked_waitq;

 	/** waitq for reserved requests */
 	wait_queue_head_t reserved_req_waitq;

 	/** The next unique request id */
 	u64 reqctr;

 	/** Connection established, cleared on umount, connection
 	    abort and device release */
 	unsigned connected;

 	/** Connection failed (version mismatch).  Cannot race with
 	    setting other bitfields since it is only set once in INIT
 	    reply, before any other request, and never cleared */
 	unsigned conn_error : 1;

 	/** Connection successful.  Only set in INIT */
 	unsigned conn_init : 1;

 	/** Do readpages asynchronously?  Only set in INIT */
 	unsigned async_read : 1;

 	/*
 	 * The following bitfields are only for optimization purposes
 	 * and hence races in setting them will not cause malfunction
 	 */

 	/** Is fsync not implemented by fs? */
 	unsigned no_fsync : 1;

 	/** Is fsyncdir not implemented by fs? */
 	unsigned no_fsyncdir : 1;

 	/** Is flush not implemented by fs? */
 	unsigned no_flush : 1;

 	/** Is setxattr not implemented by fs? */
 	unsigned no_setxattr : 1;

 	/** Is getxattr not implemented by fs? */
 	unsigned no_getxattr : 1;

 	/** Is listxattr not implemented by fs? */
 	unsigned no_listxattr : 1;

 	/** Is removexattr not implemented by fs? */
 	unsigned no_removexattr : 1;

 	/** Are file locking primitives not implemented by fs? */
 	unsigned no_lock : 1;

 	/** Is access not implemented by fs? */
 	unsigned no_access : 1;

 	/** Is create not implemented by fs? */
 	unsigned no_create : 1;

 	/** Is interrupt not implemented by fs? */
 	unsigned no_interrupt : 1;

 	/** Is bmap not implemented by fs? */
 	unsigned no_bmap : 1;

 	/** The number of requests waiting for completion */
 	atomic_t num_waiting;

 	/** Negotiated minor version */
 	unsigned minor;

 	/** Backing dev info */
 	struct backing_dev_info bdi;

 	/** Entry on the fuse_conn_list */
 	struct list_head entry;

 	/** Unique ID */
 	u64 id;

 	/** Dentries in the control filesystem */
 	struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];

 	/** number of dentries used in the above array */
 	int ctl_ndents;

 	/** O_ASYNC requests */
 	struct fasync_struct *fasync;

 	/** Key for lock owner ID scrambling */
 	u32 scramble_key[4];

 	/** Reserved request for the DESTROY message */
 	struct fuse_req *destroy_req;
 };

 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
 {
 	return sb->s_fs_info;
 }

 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;
 }

 /** Device operations */
 extern const struct file_operations fuse_dev_operations;

 /**
  * Get a filled in inode
  */
 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
 			int generation, struct fuse_attr *attr);

 /**
  * Send FORGET command
  */
 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
 		      unsigned long nodeid, u64 nlookup);

 /**
  * Initialize READ or READDIR request
  */
 void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
 		    struct inode *inode, loff_t pos, size_t count, int opcode);

 /**
  * Send OPEN or OPENDIR request
  */
 int fuse_open_common(struct inode *inode, struct file *file, int isdir);

 struct fuse_file *fuse_file_alloc(void);
 void fuse_file_free(struct fuse_file *ff);
 void fuse_finish_open(struct inode *inode, struct file *file,
 		      struct fuse_file *ff, struct fuse_open_out *outarg);

 /** Fill in ff->reserved_req with a RELEASE request */
 void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode);

 /**
  * Send RELEASE or RELEASEDIR request
  */
 int fuse_release_common(struct inode *inode, struct file *file, int isdir);

 /**
  * Send FSYNC or FSYNCDIR request
  */
 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
 		      int isdir);

 /**
  * Initialize file operations on a regular file
  */
 void fuse_init_file_inode(struct inode *inode);

 /**
  * Initialize inode operations on regular files and special files
  */
 void fuse_init_common(struct inode *inode);

 /**
  * Initialize inode and file operations on a directory
  */
 void fuse_init_dir(struct inode *inode);

 /**
  * Initialize inode operations on a symlink
  */
 void fuse_init_symlink(struct inode *inode);

 /**
  * Change attributes of an inode
  */
 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);

 /**
  * Initialize the client device
  */
 int fuse_dev_init(void);

 /**
  * Cleanup the client device
  */
 void fuse_dev_cleanup(void);

 int fuse_ctl_init(void);
 void fuse_ctl_cleanup(void);

 /**
  * Allocate a request
  */
 struct fuse_req *fuse_request_alloc(void);

 /**
  * Free a request
  */
 void fuse_request_free(struct fuse_req *req);

 /**
  * Get a request, may fail with -ENOMEM
  */
 struct fuse_req *fuse_get_req(struct fuse_conn *fc);

 /**
  * Gets a requests for a file operation, always succeeds
  */
 struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file);

 /**
  * Decrement reference count of a request.  If count goes to zero free
  * the request.
  */
 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);

 /**
  * Send a request (synchronous)
  */
 void request_send(struct fuse_conn *fc, struct fuse_req *req);

 /**
  * Send a request with no reply
  */
 void request_send_noreply(struct fuse_conn *fc, struct fuse_req *req);

 /**
  * Send a request in the background
  */
 void request_send_background(struct fuse_conn *fc, struct fuse_req *req);

 /* Abort all requests */
 void fuse_abort_conn(struct fuse_conn *fc);

 /**
  * Invalidate inode attributes
  */
 void fuse_invalidate_attr(struct inode *inode);

 /**
  * Acquire reference to fuse_conn
  */
 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);

 /**
  * Release reference to fuse_conn
  */
 void fuse_conn_put(struct fuse_conn *fc);

 /**
  * Add connection to control filesystem
  */
 int fuse_ctl_add_conn(struct fuse_conn *fc);

 /**
  * Remove connection from control filesystem
  */
 void fuse_ctl_remove_conn(struct fuse_conn *fc);

 /**
  * Is file type valid?
  */
 int fuse_valid_type(int m);
	/*
	FUSE: Filesystem in Userspace
	Copyright (C) 2001-2006 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/mount.h>
	#include <linux/wait.h>
	#include <linux/list.h>
	#include <linux/spinlock.h>
	#include <linux/mm.h>
	#include <linux/backing-dev.h>
	#include <linux/mutex.h>

	/** Max number of pages that can be used in a single read request */
	#define FUSE_MAX_PAGES_PER_REQ 32

	/** Maximum number of outstanding background requests */
	#define FUSE_MAX_BACKGROUND 12

	/** Congestion starts at 75% of maximum */
	#define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100)

	/** It could be as large as PATH_MAX, but would that have any uses? */
	#define FUSE_NAME_MAX 1024

	/** Number of dentries for each connection in the control filesystem */
	#define FUSE_CTL_NUM_DENTRIES 3

	/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
	module will check permissions based on the file mode. Otherwise no
	permission checking is done in the kernel */
	#define FUSE_DEFAULT_PERMISSIONS (1 << 0)

	/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
	doing the mount will be allowed to access the filesystem */
	#define FUSE_ALLOW_OTHER (1 << 1)

	/** List of active connections */
	extern struct list_head fuse_conn_list;

	/** Global mutex protecting fuse_conn_list and the control filesystem */
	extern struct mutex fuse_mutex;

	/** FUSE inode */
	struct fuse_inode {
	/** Inode data */
	struct inode inode;

	/** Unique ID, which identifies the inode between userspace
	* and kernel */
	u64 nodeid;

	/** Number of lookups on this inode */
	u64 nlookup;

	/** The request used for sending the FORGET message */
	struct fuse_req *forget_req;

	/** Time in jiffies until the file attributes are valid */
	u64 i_time;

	/** The sticky bit in inode->i_mode may have been removed, so
	preserve the original mode */
	mode_t orig_i_mode;
	};

	/** FUSE specific file data */
	struct fuse_file {
	/** Request reserved for flush and release */
	struct fuse_req *reserved_req;

	/** File handle used by userspace */
	u64 fh;

	/** Refcount */
	atomic_t count;
	};

	/** One input argument of a request */
	struct fuse_in_arg {
	unsigned size;
	const void *value;
	};

	/** The request input */
	struct fuse_in {
	/** The request header */
	struct fuse_in_header h;

	/** True if the data for the last argument is in req->pages */
	unsigned argpages:1;

	/** Number of arguments */
	unsigned numargs;

	/** Array of arguments */
	struct fuse_in_arg args[3];
	};

	/** One output argument of a request */
	struct fuse_arg {
	unsigned size;
	void *value;
	};

	/** The request output */
	struct fuse_out {
	/** Header returned from userspace */
	struct fuse_out_header h;

	/*
	* The following bitfields are not changed during the request
	* processing
	*/

	/** Last argument is variable length (can be shorter than
	arg->size) */
	unsigned argvar:1;

	/** Last argument is a list of pages to copy data to */
	unsigned argpages:1;

	/** Zero partially or not copied pages */
	unsigned page_zeroing:1;

	/** Number or arguments */
	unsigned numargs;

	/** Array of arguments */
	struct fuse_arg args[3];
	};

	/** The request state */
	enum fuse_req_state {
	FUSE_REQ_INIT = 0,
	FUSE_REQ_PENDING,
	FUSE_REQ_READING,
	FUSE_REQ_SENT,
	FUSE_REQ_WRITING,
	FUSE_REQ_FINISHED
	};

	struct fuse_conn;

	/**
	* A request to the client
	*/
	struct fuse_req {
	/** This can be on either pending processing or io lists in
	fuse_conn */
	struct list_head list;

	/** Entry on the interrupts list */
	struct list_head intr_entry;

	/** refcount */
	atomic_t count;

	/** Unique ID for the interrupt request */
	u64 intr_unique;

	/*
	* The following bitfields are either set once before the
	* request is queued or setting/clearing them is protected by
	* fuse_conn->lock
	*/

	/** True if the request has reply */
	unsigned isreply:1;

	/** Force sending of the request even if interrupted */
	unsigned force:1;

	/** The request was aborted */
	unsigned aborted:1;

	/** Request is sent in the background */
	unsigned background:1;

	/** The request has been interrupted */
	unsigned interrupted:1;

	/** Data is being copied to/from the request */
	unsigned locked:1;

	/** Request is counted as "waiting" */
	unsigned waiting:1;

	/** State of the request */
	enum fuse_req_state state;

	/** The request input */
	struct fuse_in in;

	/** The request output */
	struct fuse_out out;

	/** Used to wake up the task waiting for completion of request*/
	wait_queue_head_t waitq;

	/** Data for asynchronous requests */
	union {
	struct fuse_forget_in forget_in;
	struct fuse_release_in release_in;
	struct fuse_init_in init_in;
	struct fuse_init_out init_out;
	struct fuse_read_in read_in;
	struct fuse_lk_in lk_in;
	} misc;

	/** page vector */
	struct page *pages[FUSE_MAX_PAGES_PER_REQ];

	/** number of pages in vector */
	unsigned num_pages;

	/** offset of data on first page */
	unsigned page_offset;

	/** File used in the request (or NULL) */
	struct fuse_file *ff;

	/** vfsmount used in release */
	struct vfsmount *vfsmount;

	/** dentry used in release */
	struct dentry *dentry;

	/** Request completion callback */
	void (end)(struct fuse_conn , struct fuse_req *);

	/** Request is stolen from fuse_file->reserved_req */
	struct file *stolen_file;
	};

	/**
	* 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 {
	/** Lock protecting accessess to members of this structure */
	spinlock_t lock;

	/** Mutex protecting against directory alias creation */
	struct mutex inst_mutex;

	/** Refcount */
	atomic_t count;

	/** The user id for this mount */
	uid_t user_id;

	/** The group id for this mount */
	gid_t group_id;

	/** The fuse mount flags for this mount */
	unsigned flags;

	/** Maximum read size */
	unsigned max_read;

	/** Maximum write size */
	unsigned max_write;

	/** Readers of the connection are waiting on this */
	wait_queue_head_t waitq;

	/** The list of pending requests */
	struct list_head pending;

	/** The list of requests being processed */
	struct list_head processing;

	/** The list of requests under I/O */
	struct list_head io;

	/** Number of requests currently in the background */
	unsigned num_background;

	/** Pending interrupts */
	struct list_head interrupts;

	/** Flag indicating if connection is blocked. This will be
	the case before the INIT reply is received, and if there
	are too many outstading backgrounds requests */
	int blocked;

	/** waitq for blocked connection */
	wait_queue_head_t blocked_waitq;

	/** waitq for reserved requests */
	wait_queue_head_t reserved_req_waitq;

	/** The next unique request id */
	u64 reqctr;

	/** Connection established, cleared on umount, connection
	abort and device release */
	unsigned connected;

	/** Connection failed (version mismatch). Cannot race with
	setting other bitfields since it is only set once in INIT
	reply, before any other request, and never cleared */
	unsigned conn_error : 1;

	/** Connection successful. Only set in INIT */
	unsigned conn_init : 1;

	/** Do readpages asynchronously? Only set in INIT */
	unsigned async_read : 1;

	/*
	* The following bitfields are only for optimization purposes
	* and hence races in setting them will not cause malfunction
	*/

	/** Is fsync not implemented by fs? */
	unsigned no_fsync : 1;

	/** Is fsyncdir not implemented by fs? */
	unsigned no_fsyncdir : 1;

	/** Is flush not implemented by fs? */
	unsigned no_flush : 1;

	/** Is setxattr not implemented by fs? */
	unsigned no_setxattr : 1;

	/** Is getxattr not implemented by fs? */
	unsigned no_getxattr : 1;

	/** Is listxattr not implemented by fs? */
	unsigned no_listxattr : 1;

	/** Is removexattr not implemented by fs? */
	unsigned no_removexattr : 1;

	/** Are file locking primitives not implemented by fs? */
	unsigned no_lock : 1;

	/** Is access not implemented by fs? */
	unsigned no_access : 1;

	/** Is create not implemented by fs? */
	unsigned no_create : 1;

	/** Is interrupt not implemented by fs? */
	unsigned no_interrupt : 1;

	/** Is bmap not implemented by fs? */
	unsigned no_bmap : 1;

	/** The number of requests waiting for completion */
	atomic_t num_waiting;

	/** Negotiated minor version */
	unsigned minor;

	/** Backing dev info */
	struct backing_dev_info bdi;

	/** Entry on the fuse_conn_list */
	struct list_head entry;

	/** Unique ID */
	u64 id;

	/** Dentries in the control filesystem */
	struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];

	/** number of dentries used in the above array */
	int ctl_ndents;

	/** O_ASYNC requests */
	struct fasync_struct *fasync;

	/** Key for lock owner ID scrambling */
	u32 scramble_key[4];

	/** Reserved request for the DESTROY message */
	struct fuse_req *destroy_req;
	};

	static inline struct fuse_conn get_fuse_conn_super(struct super_block sb)
	{
	return sb->s_fs_info;
	}

	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;
	}

	/** Device operations */
	extern const struct file_operations fuse_dev_operations;

	/**
	* Get a filled in inode
	*/
	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
	int generation, struct fuse_attr *attr);

	/**
	* Send FORGET command
	*/
	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
	unsigned long nodeid, u64 nlookup);

	/**
	* Initialize READ or READDIR request
	*/
	void fuse_read_fill(struct fuse_req req, struct fuse_file ff,
	struct inode *inode, loff_t pos, size_t count, int opcode);

	/**
	* Send OPEN or OPENDIR request
	*/
	int fuse_open_common(struct inode inode, struct file file, int isdir);

	struct fuse_file *fuse_file_alloc(void);
	void fuse_file_free(struct fuse_file *ff);
	void fuse_finish_open(struct inode inode, struct file file,
	struct fuse_file ff, struct fuse_open_out outarg);

	/** Fill in ff->reserved_req with a RELEASE request */
	void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode);

	/**
	* Send RELEASE or RELEASEDIR request
	*/
	int fuse_release_common(struct inode inode, struct file file, int isdir);

	/**
	* Send FSYNC or FSYNCDIR request
	*/
	int fuse_fsync_common(struct file file, struct dentry de, int datasync,
	int isdir);

	/**
	* Initialize file operations on a regular file
	*/
	void fuse_init_file_inode(struct inode *inode);

	/**
	* Initialize inode operations on regular files and special files
	*/
	void fuse_init_common(struct inode *inode);

	/**
	* Initialize inode and file operations on a directory
	*/
	void fuse_init_dir(struct inode *inode);

	/**
	* Initialize inode operations on a symlink
	*/
	void fuse_init_symlink(struct inode *inode);

	/**
	* Change attributes of an inode
	*/
	void fuse_change_attributes(struct inode inode, struct fuse_attr attr);

	/**
	* Initialize the client device
	*/
	int fuse_dev_init(void);

	/**
	* Cleanup the client device
	*/
	void fuse_dev_cleanup(void);

	int fuse_ctl_init(void);
	void fuse_ctl_cleanup(void);

	/**
	* Allocate a request
	*/
	struct fuse_req *fuse_request_alloc(void);

	/**
	* Free a request
	*/
	void fuse_request_free(struct fuse_req *req);

	/**
	* Get a request, may fail with -ENOMEM
	*/
	struct fuse_req fuse_get_req(struct fuse_conn fc);

	/**
	* Gets a requests for a file operation, always succeeds
	*/
	struct fuse_req fuse_get_req_nofail(struct fuse_conn fc, struct file *file);

	/**
	* Decrement reference count of a request. If count goes to zero free
	* the request.
	*/
	void fuse_put_request(struct fuse_conn fc, struct fuse_req req);

	/**
	* Send a request (synchronous)
	*/
	void request_send(struct fuse_conn fc, struct fuse_req req);

	/**
	* Send a request with no reply
	*/
	void request_send_noreply(struct fuse_conn fc, struct fuse_req req);

	/**
	* Send a request in the background
	*/
	void request_send_background(struct fuse_conn fc, struct fuse_req req);

	/* Abort all requests */
	void fuse_abort_conn(struct fuse_conn *fc);

	/**
	* Invalidate inode attributes
	*/
	void fuse_invalidate_attr(struct inode *inode);

	/**
	* Acquire reference to fuse_conn
	*/
	struct fuse_conn fuse_conn_get(struct fuse_conn fc);

	/**
	* Release reference to fuse_conn
	*/
	void fuse_conn_put(struct fuse_conn *fc);

	/**
	* Add connection to control filesystem
	*/
	int fuse_ctl_add_conn(struct fuse_conn *fc);

	/**
	* Remove connection from control filesystem
	*/
	void fuse_ctl_remove_conn(struct fuse_conn *fc);

	/**
	* Is file type valid?
	*/
	int fuse_valid_type(int m);