[deliverable/linux.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];
};

/**
 * 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;

	/** Request has been sent to userspace */
	unsigned sent:1;

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

	/** 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
334f485d MS	114	/**
	115	* A request to the client
	116	*/
	117	struct fuse_req {
	118	/** This can be on either unused_list, pending or processing
	119	lists in fuse_conn */
	120	struct list_head list;
	121
1e9a4ed9 MS	122	/** Entry on the background list */
	123	struct list_head bg_entry;
	124
334f485d MS	125	/** refcount */
	126	atomic_t count;
	127
	128	/** True if the request has reply */
	129	unsigned isreply:1;
	130
	131	/** The request is preallocated */
	132	unsigned preallocated:1;
	133
	134	/** The request was interrupted */
	135	unsigned interrupted:1;
	136
	137	/** Request is sent in the background */
	138	unsigned background:1;
	139
	140	/** Data is being copied to/from the request */
	141	unsigned locked:1;
	142
	143	/** Request has been sent to userspace */
	144	unsigned sent:1;
	145
	146	/** The request is finished */
	147	unsigned finished:1;
	148
	149	/** The request input */
	150	struct fuse_in in;
	151
	152	/** The request output */
	153	struct fuse_out out;
	154
	155	/** Used to wake up the task waiting for completion of request*/
	156	wait_queue_head_t waitq;
	157
	158	/** Data for asynchronous requests */
	159	union {
e5e5558e	160	struct fuse_forget_in forget_in;
b6aeaded	161	struct fuse_release_in release_in;
3ec870d5 MS	162	struct fuse_init_in init_in;
3ec870d5 MS	163	struct fuse_init_out init_out;
334f485d MS	164	} misc;
	165
	166	/** page vector */
	167	struct page *pages[FUSE_MAX_PAGES_PER_REQ];
	168
	169	/** number of pages in vector */
	170	unsigned num_pages;
	171
	172	/** offset of data on first page */
	173	unsigned page_offset;
	174
	175	/** Inode used in the request */
	176	struct inode *inode;
	177
	178	/** Second inode used in the request (or NULL) */
	179	struct inode *inode2;
	180
	181	/** File used in the request (or NULL) */
	182	struct file *file;
	183	};
	184
d8a5ba45 MS	185	/**
	186	* A Fuse connection.
	187	*
	188	* This structure is created, when the filesystem is mounted, and is
	189	* destroyed, when the client device is closed and the filesystem is
	190	* unmounted.
	191	*/
	192	struct fuse_conn {
1e9a4ed9 MS	193	/** Reference count */
1e9a4ed9 MS	194	int count;
334f485d	195
d8a5ba45 MS	196	/** The user id for this mount */
	197	uid_t user_id;
	198
87729a55 MS	199	/** The group id for this mount */
	200	gid_t group_id;
	201
1e9a4ed9 MS	202	/** The fuse mount flags for this mount */
	203	unsigned flags;
	204
db50b96c MS	205	/** Maximum read size */
	206	unsigned max_read;
	207
413ef8cb MS	208	/** Maximum write size */
	209	unsigned max_write;
	210
334f485d MS	211	/** Readers of the connection are waiting on this */
	212	wait_queue_head_t waitq;
	213
	214	/** The list of pending requests */
	215	struct list_head pending;
	216
	217	/** The list of requests being processed */
	218	struct list_head processing;
	219
1e9a4ed9 MS	220	/** Requests put in the background (RELEASE or any other
	221	interrupted request) */
	222	struct list_head background;
	223
334f485d MS	224	/** Controls the maximum number of outstanding requests */
	225	struct semaphore outstanding_sem;
	226
	227	/** This counts the number of outstanding requests if
	228	outstanding_sem would go negative */
	229	unsigned outstanding_debt;
	230
1e9a4ed9 MS	231	/** RW semaphore for exclusion with fuse_put_super() */
	232	struct rw_semaphore sbput_sem;
	233
334f485d MS	234	/** The list of unused requests */
	235	struct list_head unused_list;
	236
	237	/** The next unique request id */
	238	u64 reqctr;
	239
1e9a4ed9 MS	240	/** Mount is active */
	241	unsigned mounted : 1;
	242
	243	/** Connection established */
	244	unsigned connected : 1;
	245
334f485d MS	246	/** Connection failed (version mismatch) */
	247	unsigned conn_error : 1;
	248
b6aeaded MS	249	/** Is fsync not implemented by fs? */
	250	unsigned no_fsync : 1;
	251
82547981 MS	252	/** Is fsyncdir not implemented by fs? */
	253	unsigned no_fsyncdir : 1;
	254
b6aeaded MS	255	/** Is flush not implemented by fs? */
	256	unsigned no_flush : 1;
	257
92a8780e MS	258	/** Is setxattr not implemented by fs? */
	259	unsigned no_setxattr : 1;
	260
	261	/** Is getxattr not implemented by fs? */
	262	unsigned no_getxattr : 1;
	263
	264	/** Is listxattr not implemented by fs? */
	265	unsigned no_listxattr : 1;
	266
	267	/** Is removexattr not implemented by fs? */
	268	unsigned no_removexattr : 1;
	269
31d40d74 MS	270	/** Is access not implemented by fs? */
	271	unsigned no_access : 1;
	272
fd72faac MS	273	/** Is create not implemented by fs? */
	274	unsigned no_create : 1;
	275
45714d65 MS	276	/** Negotiated minor version */
	277	unsigned minor;
	278
d8a5ba45 MS	279	/** Backing dev info */
	280	struct backing_dev_info bdi;
	281	};
	282
d8a5ba45 MS	283	static inline struct fuse_conn get_fuse_conn_super(struct super_block sb)
d8a5ba45 MS	284	{
6383bdaa	285	return sb->s_fs_info;
d8a5ba45 MS	286	}
	287
	288	static inline struct fuse_conn get_fuse_conn(struct inode inode)
	289	{
	290	return get_fuse_conn_super(inode->i_sb);
	291	}
	292
	293	static inline struct fuse_inode get_fuse_inode(struct inode inode)
	294	{
	295	return container_of(inode, struct fuse_inode, inode);
	296	}
	297
	298	static inline u64 get_node_id(struct inode *inode)
	299	{
	300	return get_fuse_inode(inode)->nodeid;
	301	}
	302
334f485d MS	303	/** Device operations */
	304	extern struct file_operations fuse_dev_operations;
	305
d8a5ba45 MS	306	/**
	307	* This is the single global spinlock which protects FUSE's structures
	308	*
	309	* The following data is protected by this lock:
	310	*
334f485d	311	* - the private_data field of the device file
d8a5ba45	312	* - the s_fs_info field of the super block
334f485d	313	* - unused_list, pending, processing lists in fuse_conn
1e9a4ed9	314	* - background list in fuse_conn
334f485d	315	* - the unique request ID counter reqctr in fuse_conn
d8a5ba45	316	* - the sb (super_block) field in fuse_conn
334f485d	317	* - the file (device file) field in fuse_conn
d8a5ba45 MS	318	*/
	319	extern spinlock_t fuse_lock;
	320
e5e5558e MS	321	/**
	322	* Get a filled in inode
	323	*/
	324	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
9e6268db	325	int generation, struct fuse_attr *attr);
e5e5558e MS	326
	327	/**
	328	* Send FORGET command
	329	*/
	330	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
9e6268db	331	unsigned long nodeid, u64 nlookup);
e5e5558e	332
04730fef MS	333	/**
	334	* Send READ or READDIR request
	335	*/
	336	size_t fuse_send_read_common(struct fuse_req req, struct file file,
	337	struct inode *inode, loff_t pos, size_t count,
	338	int isdir);
	339
	340	/**
	341	* Send OPEN or OPENDIR request
	342	*/
	343	int fuse_open_common(struct inode inode, struct file file, int isdir);
	344
fd72faac MS	345	struct fuse_file *fuse_file_alloc(void);
	346	void fuse_file_free(struct fuse_file *ff);
	347	void fuse_finish_open(struct inode inode, struct file file,
	348	struct fuse_file ff, struct fuse_open_out outarg);
	349
	350	/**
	351	* Send a RELEASE request
	352	*/
	353	void fuse_send_release(struct fuse_conn fc, struct fuse_file ff,
	354	u64 nodeid, struct inode *inode, int flags, int isdir);
	355
04730fef MS	356	/**
	357	* Send RELEASE or RELEASEDIR request
	358	*/
	359	int fuse_release_common(struct inode inode, struct file file, int isdir);
	360
82547981 MS	361	/**
	362	* Send FSYNC or FSYNCDIR request
	363	*/
	364	int fuse_fsync_common(struct file file, struct dentry de, int datasync,
	365	int isdir);
	366
b6aeaded	367	/**
1779381d	368	* Initialize file operations on a regular file
b6aeaded MS	369	*/
	370	void fuse_init_file_inode(struct inode *inode);
	371
e5e5558e	372	/**
1779381d	373	* Initialize inode operations on regular files and special files
e5e5558e MS	374	*/
	375	void fuse_init_common(struct inode *inode);
	376
	377	/**
1779381d	378	* Initialize inode and file operations on a directory
e5e5558e MS	379	*/
	380	void fuse_init_dir(struct inode *inode);
	381
	382	/**
1779381d	383	* Initialize inode operations on a symlink
e5e5558e MS	384	*/
	385	void fuse_init_symlink(struct inode *inode);
	386
	387	/**
	388	* Change attributes of an inode
	389	*/
	390	void fuse_change_attributes(struct inode inode, struct fuse_attr attr);
	391
d8a5ba45 MS	392	/**
	393	* Check if the connection can be released, and if yes, then free the
	394	* connection structure
	395	*/
	396	void fuse_release_conn(struct fuse_conn *fc);
	397
334f485d MS	398	/**
	399	* Initialize the client device
	400	*/
	401	int fuse_dev_init(void);
	402
	403	/**
	404	* Cleanup the client device
	405	*/
	406	void fuse_dev_cleanup(void);
	407
	408	/**
	409	* Allocate a request
	410	*/
	411	struct fuse_req *fuse_request_alloc(void);
	412
	413	/**
	414	* Free a request
	415	*/
	416	void fuse_request_free(struct fuse_req *req);
	417
	418	/**
	419	* Reinitialize a request, the preallocated flag is left unmodified
	420	*/
	421	void fuse_reset_request(struct fuse_req *req);
	422
	423	/**
	424	* Reserve a preallocated request
	425	*/
	426	struct fuse_req fuse_get_request(struct fuse_conn fc);
	427
334f485d MS	428	/**
334f485d MS	429	* Decrement reference count of a request. If count goes to zero put
1779381d	430	* on unused list (preallocated) or free request (not preallocated).
334f485d MS	431	*/
	432	void fuse_put_request(struct fuse_conn fc, struct fuse_req req);
	433
	434	/**
7c352bdf	435	* Send a request (synchronous)
334f485d MS	436	*/
	437	void request_send(struct fuse_conn fc, struct fuse_req req);
	438
334f485d MS	439	/**
	440	* Send a request with no reply
	441	*/
	442	void request_send_noreply(struct fuse_conn fc, struct fuse_req req);
	443
	444	/**
	445	* Send a request in the background
	446	*/
	447	void request_send_background(struct fuse_conn fc, struct fuse_req req);
	448
1e9a4ed9	449	/**
1779381d	450	* Release inodes and file associated with background request
1e9a4ed9 MS	451	*/
	452	void fuse_release_background(struct fuse_req *req);
	453
e5e5558e MS	454	/**
	455	* Get the attributes of a file
	456	*/
	457	int fuse_do_getattr(struct inode *inode);
	458
	459	/**
	460	* Invalidate inode attributes
	461	*/
	462	void fuse_invalidate_attr(struct inode *inode);
	463
334f485d MS	464	/**
	465	* Send the INIT message
	466	*/
	467	void fuse_send_init(struct fuse_conn *fc);