[linux-2.6-block.git] / fs / fuse / fuse_i.h

/*
  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>

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

/** If more requests are outstanding, then the operation will block */
#define FUSE_MAX_OUTSTANDING 10

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

/** 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)


/** 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 */
	unsigned long i_time;
};

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

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

/** 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;

	/** 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_FINISHED
};

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

	/** Entry on the background list */
	struct list_head bg_entry;

	/** refcount */
	atomic_t count;

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

	/** The request is preallocated */
	unsigned preallocated:1;

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

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

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

	/** Inode used in the request */
	struct inode *inode;

	/** Second inode used in the request (or NULL) */
	struct inode *inode2;

	/** File used in the request (or NULL) */
	struct file *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 {
	/** Reference count */
	int 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;

	/** Requests put in the background (RELEASE or any other
	    interrupted request) */
	struct list_head background;

	/** Controls the maximum number of outstanding requests */
	struct semaphore outstanding_sem;

	/** This counts the number of outstanding requests if
	    outstanding_sem would go negative */
	unsigned outstanding_debt;

	/** RW semaphore for exclusion with fuse_put_super() */
	struct rw_semaphore sbput_sem;

	/** The list of unused requests */
	struct list_head unused_list;

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

	/** Mount is active */
	unsigned mounted : 1;

	/** Connection established */
	unsigned connected : 1;

	/** Connection failed (version mismatch) */
	unsigned conn_error : 1;

	/** 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;

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

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

	/** Negotiated minor version */
	unsigned minor;

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

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 struct file_operations fuse_dev_operations;

/**
 * This is the single global spinlock which protects FUSE's structures
 *
 * The following data is protected by this lock:
 *
 *  - the private_data field of the device file
 *  - the s_fs_info field of the super block
 *  - unused_list, pending, processing lists in fuse_conn
 *  - background list in fuse_conn
 *  - the unique request ID counter reqctr in fuse_conn
 *  - the sb (super_block) field in fuse_conn
 *  - the file (device file) field in fuse_conn
 */
extern spinlock_t fuse_lock;

/**
 * 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);

/**
 * Send READ or READDIR request
 */
size_t fuse_send_read_common(struct fuse_req *req, struct file *file,
			     struct inode *inode, loff_t pos, size_t count,
			     int isdir);

/**
 * 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);

/**
 * Send a RELEASE request
 */
void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff,
		       u64 nodeid, struct inode *inode, int flags, int isdir);

/**
 * 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);

/**
 * Check if the connection can be released, and if yes, then free the
 * connection structure
 */
void fuse_release_conn(struct fuse_conn *fc);

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

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

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

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

/**
 * Reinitialize a request, the preallocated flag is left unmodified
 */
void fuse_reset_request(struct fuse_req *req);

/**
 * Reserve a preallocated request
 */
struct fuse_req *fuse_get_request(struct fuse_conn *fc);

/**
 * Decrement reference count of a request.  If count goes to zero put
 * on unused list (preallocated) or free request (not preallocated).
 */
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);

/**
 * Release inodes and file associated with background request
 */
void fuse_release_background(struct fuse_req *req);

/**
 * Get the attributes of a file
 */
int fuse_do_getattr(struct inode *inode);

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

/**
 * Send the INIT message
 */
void fuse_send_init(struct fuse_conn *fc);
Commit	Line	Data
d8a5ba45 MS	1	/*
	2	FUSE: Filesystem in Userspace
	3	Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
	4
	5	This program can be distributed under the terms of the GNU GPL.
	6	See the file COPYING.
	7	*/
	8
	9	#include <linux/fuse.h>
	10	#include <linux/fs.h>
	11	#include <linux/wait.h>
	12	#include <linux/list.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/mm.h>
	15	#include <linux/backing-dev.h>
	16	#include <asm/semaphore.h>
	17
334f485d MS	18	/** Max number of pages that can be used in a single read request */
	19	#define FUSE_MAX_PAGES_PER_REQ 32
	20
	21	/** If more requests are outstanding, then the operation will block */
	22	#define FUSE_MAX_OUTSTANDING 10
	23
1d3d752b MS	24	/** It could be as large as PATH_MAX, but would that have any uses? */
	25	#define FUSE_NAME_MAX 1024
	26
1e9a4ed9 MS	27	/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
	28	module will check permissions based on the file mode. Otherwise no
	29	permission checking is done in the kernel */
	30	#define FUSE_DEFAULT_PERMISSIONS (1 << 0)
	31
	32	/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
	33	doing the mount will be allowed to access the filesystem */
	34	#define FUSE_ALLOW_OTHER (1 << 1)
	35
413ef8cb	36
d8a5ba45 MS	37	/** FUSE inode */
	38	struct fuse_inode {
	39	/** Inode data */
	40	struct inode inode;
	41
	42	/** Unique ID, which identifies the inode between userspace
	43	* and kernel */
	44	u64 nodeid;
	45
9e6268db MS	46	/** Number of lookups on this inode */
	47	u64 nlookup;
	48
e5e5558e MS	49	/** The request used for sending the FORGET message */
	50	struct fuse_req *forget_req;
	51
d8a5ba45 MS	52	/** Time in jiffies until the file attributes are valid */
	53	unsigned long i_time;
	54	};
	55
b6aeaded MS	56	/** FUSE specific file data */
	57	struct fuse_file {
	58	/** Request reserved for flush and release */
	59	struct fuse_req *release_req;
	60
	61	/** File handle used by userspace */
	62	u64 fh;
	63	};
	64
334f485d MS	65	/** One input argument of a request */
	66	struct fuse_in_arg {
	67	unsigned size;
	68	const void *value;
	69	};
	70
	71	/** The request input */
	72	struct fuse_in {
	73	/** The request header */
	74	struct fuse_in_header h;
	75
	76	/** True if the data for the last argument is in req->pages */
	77	unsigned argpages:1;
	78
	79	/** Number of arguments */
	80	unsigned numargs;
	81
	82	/** Array of arguments */
	83	struct fuse_in_arg args[3];
	84	};
	85
	86	/** One output argument of a request */
	87	struct fuse_arg {
	88	unsigned size;
	89	void *value;
	90	};
	91
	92	/** The request output */
	93	struct fuse_out {
	94	/** Header returned from userspace */
	95	struct fuse_out_header h;
	96
	97	/** Last argument is variable length (can be shorter than
	98	arg->size) */
	99	unsigned argvar:1;
	100
	101	/** Last argument is a list of pages to copy data to */
	102	unsigned argpages:1;
	103
	104	/** Zero partially or not copied pages */
	105	unsigned page_zeroing:1;
	106
	107	/** Number or arguments */
	108	unsigned numargs;
	109
	110	/** Array of arguments */
	111	struct fuse_arg args[3];
	112	};
	113
83cfd493 MS	114	/** The request state */
	115	enum fuse_req_state {
	116	FUSE_REQ_INIT = 0,
	117	FUSE_REQ_PENDING,
	118	FUSE_REQ_READING,
	119	FUSE_REQ_SENT,
	120	FUSE_REQ_FINISHED
	121	};
	122
334f485d MS	123	/**
	124	* A request to the client
	125	*/
	126	struct fuse_req {
	127	/** This can be on either unused_list, pending or processing
	128	lists in fuse_conn */
	129	struct list_head list;
	130
1e9a4ed9 MS	131	/** Entry on the background list */
	132	struct list_head bg_entry;
	133
334f485d MS	134	/** refcount */
	135	atomic_t count;
	136
	137	/** True if the request has reply */
	138	unsigned isreply:1;
	139
	140	/** The request is preallocated */
	141	unsigned preallocated:1;
	142
	143	/** The request was interrupted */
	144	unsigned interrupted:1;
	145
	146	/** Request is sent in the background */
	147	unsigned background:1;
	148
	149	/** Data is being copied to/from the request */
	150	unsigned locked:1;
	151
83cfd493 MS	152	/** State of the request */
83cfd493 MS	153	enum fuse_req_state state;
334f485d MS	154
	155	/** The request input */
	156	struct fuse_in in;
	157
	158	/** The request output */
	159	struct fuse_out out;
	160
	161	/** Used to wake up the task waiting for completion of request*/
	162	wait_queue_head_t waitq;
	163
	164	/** Data for asynchronous requests */
	165	union {
e5e5558e	166	struct fuse_forget_in forget_in;
b6aeaded	167	struct fuse_release_in release_in;
3ec870d5 MS	168	struct fuse_init_in init_in;
3ec870d5 MS	169	struct fuse_init_out init_out;
334f485d MS	170	} misc;
	171
	172	/** page vector */
	173	struct page *pages[FUSE_MAX_PAGES_PER_REQ];
	174
	175	/** number of pages in vector */
	176	unsigned num_pages;
	177
	178	/** offset of data on first page */
	179	unsigned page_offset;
	180
	181	/** Inode used in the request */
	182	struct inode *inode;
	183
	184	/** Second inode used in the request (or NULL) */
	185	struct inode *inode2;
	186
	187	/** File used in the request (or NULL) */
	188	struct file *file;
	189	};
	190
d8a5ba45 MS	191	/**
	192	* A Fuse connection.
	193	*
	194	* This structure is created, when the filesystem is mounted, and is
	195	* destroyed, when the client device is closed and the filesystem is
	196	* unmounted.
	197	*/
	198	struct fuse_conn {
1e9a4ed9 MS	199	/** Reference count */
1e9a4ed9 MS	200	int count;
334f485d	201
d8a5ba45 MS	202	/** The user id for this mount */
	203	uid_t user_id;
	204
87729a55 MS	205	/** The group id for this mount */
	206	gid_t group_id;
	207
1e9a4ed9 MS	208	/** The fuse mount flags for this mount */
	209	unsigned flags;
	210
db50b96c MS	211	/** Maximum read size */
	212	unsigned max_read;
	213
413ef8cb MS	214	/** Maximum write size */
	215	unsigned max_write;
	216
334f485d MS	217	/** Readers of the connection are waiting on this */
	218	wait_queue_head_t waitq;
	219
	220	/** The list of pending requests */
	221	struct list_head pending;
	222
	223	/** The list of requests being processed */
	224	struct list_head processing;
	225
1e9a4ed9 MS	226	/** Requests put in the background (RELEASE or any other
	227	interrupted request) */
	228	struct list_head background;
	229
334f485d MS	230	/** Controls the maximum number of outstanding requests */
	231	struct semaphore outstanding_sem;
	232
	233	/** This counts the number of outstanding requests if
	234	outstanding_sem would go negative */
	235	unsigned outstanding_debt;
	236
1e9a4ed9 MS	237	/** RW semaphore for exclusion with fuse_put_super() */
	238	struct rw_semaphore sbput_sem;
	239
334f485d MS	240	/** The list of unused requests */
	241	struct list_head unused_list;
	242
	243	/** The next unique request id */
	244	u64 reqctr;
	245
1e9a4ed9 MS	246	/** Mount is active */
	247	unsigned mounted : 1;
	248
	249	/** Connection established */
	250	unsigned connected : 1;
	251
334f485d MS	252	/** Connection failed (version mismatch) */
	253	unsigned conn_error : 1;
	254
b6aeaded MS	255	/** Is fsync not implemented by fs? */
	256	unsigned no_fsync : 1;
	257
82547981 MS	258	/** Is fsyncdir not implemented by fs? */
	259	unsigned no_fsyncdir : 1;
	260
b6aeaded MS	261	/** Is flush not implemented by fs? */
	262	unsigned no_flush : 1;
	263
92a8780e MS	264	/** Is setxattr not implemented by fs? */
	265	unsigned no_setxattr : 1;
	266
	267	/** Is getxattr not implemented by fs? */
	268	unsigned no_getxattr : 1;
	269
	270	/** Is listxattr not implemented by fs? */
	271	unsigned no_listxattr : 1;
	272
	273	/** Is removexattr not implemented by fs? */
	274	unsigned no_removexattr : 1;
	275
31d40d74 MS	276	/** Is access not implemented by fs? */
	277	unsigned no_access : 1;
	278
fd72faac MS	279	/** Is create not implemented by fs? */
	280	unsigned no_create : 1;
	281
45714d65 MS	282	/** Negotiated minor version */
	283	unsigned minor;
	284
d8a5ba45 MS	285	/** Backing dev info */
	286	struct backing_dev_info bdi;
	287	};
	288
d8a5ba45 MS	289	static inline struct fuse_conn get_fuse_conn_super(struct super_block sb)
d8a5ba45 MS	290	{
6383bdaa	291	return sb->s_fs_info;
d8a5ba45 MS	292	}
	293
	294	static inline struct fuse_conn get_fuse_conn(struct inode inode)
	295	{
	296	return get_fuse_conn_super(inode->i_sb);
	297	}
	298
	299	static inline struct fuse_inode get_fuse_inode(struct inode inode)
	300	{
	301	return container_of(inode, struct fuse_inode, inode);
	302	}
	303
	304	static inline u64 get_node_id(struct inode *inode)
	305	{
	306	return get_fuse_inode(inode)->nodeid;
	307	}
	308
334f485d MS	309	/** Device operations */
	310	extern struct file_operations fuse_dev_operations;
	311
d8a5ba45 MS	312	/**
	313	* This is the single global spinlock which protects FUSE's structures
	314	*
	315	* The following data is protected by this lock:
	316	*
334f485d	317	* - the private_data field of the device file
d8a5ba45	318	* - the s_fs_info field of the super block
334f485d	319	* - unused_list, pending, processing lists in fuse_conn
1e9a4ed9	320	* - background list in fuse_conn
334f485d	321	* - the unique request ID counter reqctr in fuse_conn
d8a5ba45	322	* - the sb (super_block) field in fuse_conn
334f485d	323	* - the file (device file) field in fuse_conn
d8a5ba45 MS	324	*/
	325	extern spinlock_t fuse_lock;
	326
e5e5558e MS	327	/**
	328	* Get a filled in inode
	329	*/
	330	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
9e6268db	331	int generation, struct fuse_attr *attr);
e5e5558e MS	332
	333	/**
	334	* Send FORGET command
	335	*/
	336	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
9e6268db	337	unsigned long nodeid, u64 nlookup);
e5e5558e	338
04730fef MS	339	/**
	340	* Send READ or READDIR request
	341	*/
	342	size_t fuse_send_read_common(struct fuse_req req, struct file file,
	343	struct inode *inode, loff_t pos, size_t count,
	344	int isdir);
	345
	346	/**
	347	* Send OPEN or OPENDIR request
	348	*/
	349	int fuse_open_common(struct inode inode, struct file file, int isdir);
	350
fd72faac MS	351	struct fuse_file *fuse_file_alloc(void);
	352	void fuse_file_free(struct fuse_file *ff);
	353	void fuse_finish_open(struct inode inode, struct file file,
	354	struct fuse_file ff, struct fuse_open_out outarg);
	355
	356	/**
	357	* Send a RELEASE request
	358	*/
	359	void fuse_send_release(struct fuse_conn fc, struct fuse_file ff,
	360	u64 nodeid, struct inode *inode, int flags, int isdir);
	361
04730fef MS	362	/**
	363	* Send RELEASE or RELEASEDIR request
	364	*/
	365	int fuse_release_common(struct inode inode, struct file file, int isdir);
	366
82547981 MS	367	/**
	368	* Send FSYNC or FSYNCDIR request
	369	*/
	370	int fuse_fsync_common(struct file file, struct dentry de, int datasync,
	371	int isdir);
	372
b6aeaded	373	/**
1779381d	374	* Initialize file operations on a regular file
b6aeaded MS	375	*/
	376	void fuse_init_file_inode(struct inode *inode);
	377
e5e5558e	378	/**
1779381d	379	* Initialize inode operations on regular files and special files
e5e5558e MS	380	*/
	381	void fuse_init_common(struct inode *inode);
	382
	383	/**
1779381d	384	* Initialize inode and file operations on a directory
e5e5558e MS	385	*/
	386	void fuse_init_dir(struct inode *inode);
	387
	388	/**
1779381d	389	* Initialize inode operations on a symlink
e5e5558e MS	390	*/
	391	void fuse_init_symlink(struct inode *inode);
	392
	393	/**
	394	* Change attributes of an inode
	395	*/
	396	void fuse_change_attributes(struct inode inode, struct fuse_attr attr);
	397
d8a5ba45 MS	398	/**
	399	* Check if the connection can be released, and if yes, then free the
	400	* connection structure
	401	*/
	402	void fuse_release_conn(struct fuse_conn *fc);
	403
334f485d MS	404	/**
	405	* Initialize the client device
	406	*/
	407	int fuse_dev_init(void);
	408
	409	/**
	410	* Cleanup the client device
	411	*/
	412	void fuse_dev_cleanup(void);
	413
	414	/**
	415	* Allocate a request
	416	*/
	417	struct fuse_req *fuse_request_alloc(void);
	418
	419	/**
	420	* Free a request
	421	*/
	422	void fuse_request_free(struct fuse_req *req);
	423
	424	/**
	425	* Reinitialize a request, the preallocated flag is left unmodified
	426	*/
	427	void fuse_reset_request(struct fuse_req *req);
	428
	429	/**
	430	* Reserve a preallocated request
	431	*/
	432	struct fuse_req fuse_get_request(struct fuse_conn fc);
	433
334f485d MS	434	/**
334f485d MS	435	* Decrement reference count of a request. If count goes to zero put
1779381d	436	* on unused list (preallocated) or free request (not preallocated).
334f485d MS	437	*/
	438	void fuse_put_request(struct fuse_conn fc, struct fuse_req req);
	439
	440	/**
7c352bdf	441	* Send a request (synchronous)
334f485d MS	442	*/
	443	void request_send(struct fuse_conn fc, struct fuse_req req);
	444
334f485d MS	445	/**
	446	* Send a request with no reply
	447	*/
	448	void request_send_noreply(struct fuse_conn fc, struct fuse_req req);
	449
	450	/**
	451	* Send a request in the background
	452	*/
	453	void request_send_background(struct fuse_conn fc, struct fuse_req req);
	454
1e9a4ed9	455	/**
1779381d	456	* Release inodes and file associated with background request
1e9a4ed9 MS	457	*/
	458	void fuse_release_background(struct fuse_req *req);
	459
e5e5558e MS	460	/**
	461	* Get the attributes of a file
	462	*/
	463	int fuse_do_getattr(struct inode *inode);
	464
	465	/**
	466	* Invalidate inode attributes
	467	*/
	468	void fuse_invalidate_attr(struct inode *inode);
	469
334f485d MS	470	/**
	471	* Send the INIT message
	472	*/
	473	void fuse_send_init(struct fuse_conn *fc);