[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];
};

/** 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 processing or
	    io 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;

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

	/** 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, cleared on umount and device
	    release */
	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 {
d77a1d5b MS	127	/** This can be on either unused_list, pending processing or
d77a1d5b MS	128	io lists in fuse_conn */
334f485d MS	129	struct list_head list;
334f485d MS	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
d77a1d5b MS	226	/** The list of requests under I/O */
	227	struct list_head io;
	228
1e9a4ed9 MS	229	/** Requests put in the background (RELEASE or any other
	230	interrupted request) */
	231	struct list_head background;
	232
334f485d MS	233	/** Controls the maximum number of outstanding requests */
	234	struct semaphore outstanding_sem;
	235
	236	/** This counts the number of outstanding requests if
	237	outstanding_sem would go negative */
	238	unsigned outstanding_debt;
	239
1e9a4ed9 MS	240	/** RW semaphore for exclusion with fuse_put_super() */
	241	struct rw_semaphore sbput_sem;
	242
334f485d MS	243	/** The list of unused requests */
	244	struct list_head unused_list;
	245
	246	/** The next unique request id */
	247	u64 reqctr;
	248
1e9a4ed9 MS	249	/** Mount is active */
	250	unsigned mounted : 1;
	251
9ba7cbba MS	252	/** Connection established, cleared on umount and device
9ba7cbba MS	253	release */
1e9a4ed9 MS	254	unsigned connected : 1;
1e9a4ed9 MS	255
334f485d MS	256	/** Connection failed (version mismatch) */
	257	unsigned conn_error : 1;
	258
b6aeaded MS	259	/** Is fsync not implemented by fs? */
	260	unsigned no_fsync : 1;
	261
82547981 MS	262	/** Is fsyncdir not implemented by fs? */
	263	unsigned no_fsyncdir : 1;
	264
b6aeaded MS	265	/** Is flush not implemented by fs? */
	266	unsigned no_flush : 1;
	267
92a8780e MS	268	/** Is setxattr not implemented by fs? */
	269	unsigned no_setxattr : 1;
	270
	271	/** Is getxattr not implemented by fs? */
	272	unsigned no_getxattr : 1;
	273
	274	/** Is listxattr not implemented by fs? */
	275	unsigned no_listxattr : 1;
	276
	277	/** Is removexattr not implemented by fs? */
	278	unsigned no_removexattr : 1;
	279
31d40d74 MS	280	/** Is access not implemented by fs? */
	281	unsigned no_access : 1;
	282
fd72faac MS	283	/** Is create not implemented by fs? */
	284	unsigned no_create : 1;
	285
45714d65 MS	286	/** Negotiated minor version */
	287	unsigned minor;
	288
d8a5ba45 MS	289	/** Backing dev info */
	290	struct backing_dev_info bdi;
	291	};
	292
d8a5ba45 MS	293	static inline struct fuse_conn get_fuse_conn_super(struct super_block sb)
d8a5ba45 MS	294	{
6383bdaa	295	return sb->s_fs_info;
d8a5ba45 MS	296	}
	297
	298	static inline struct fuse_conn get_fuse_conn(struct inode inode)
	299	{
	300	return get_fuse_conn_super(inode->i_sb);
	301	}
	302
	303	static inline struct fuse_inode get_fuse_inode(struct inode inode)
	304	{
	305	return container_of(inode, struct fuse_inode, inode);
	306	}
	307
	308	static inline u64 get_node_id(struct inode *inode)
	309	{
	310	return get_fuse_inode(inode)->nodeid;
	311	}
	312
334f485d MS	313	/** Device operations */
	314	extern struct file_operations fuse_dev_operations;
	315
d8a5ba45 MS	316	/**
	317	* This is the single global spinlock which protects FUSE's structures
	318	*
	319	* The following data is protected by this lock:
	320	*
334f485d	321	* - the private_data field of the device file
d8a5ba45	322	* - the s_fs_info field of the super block
334f485d	323	* - unused_list, pending, processing lists in fuse_conn
1e9a4ed9	324	* - background list in fuse_conn
334f485d	325	* - the unique request ID counter reqctr in fuse_conn
d8a5ba45	326	* - the sb (super_block) field in fuse_conn
334f485d	327	* - the file (device file) field in fuse_conn
d8a5ba45 MS	328	*/
	329	extern spinlock_t fuse_lock;
	330
e5e5558e MS	331	/**
	332	* Get a filled in inode
	333	*/
	334	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
9e6268db	335	int generation, struct fuse_attr *attr);
e5e5558e MS	336
	337	/**
	338	* Send FORGET command
	339	*/
	340	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
9e6268db	341	unsigned long nodeid, u64 nlookup);
e5e5558e	342
04730fef MS	343	/**
	344	* Send READ or READDIR request
	345	*/
	346	size_t fuse_send_read_common(struct fuse_req req, struct file file,
	347	struct inode *inode, loff_t pos, size_t count,
	348	int isdir);
	349
	350	/**
	351	* Send OPEN or OPENDIR request
	352	*/
	353	int fuse_open_common(struct inode inode, struct file file, int isdir);
	354
fd72faac MS	355	struct fuse_file *fuse_file_alloc(void);
	356	void fuse_file_free(struct fuse_file *ff);
	357	void fuse_finish_open(struct inode inode, struct file file,
	358	struct fuse_file ff, struct fuse_open_out outarg);
	359
	360	/**
	361	* Send a RELEASE request
	362	*/
	363	void fuse_send_release(struct fuse_conn fc, struct fuse_file ff,
	364	u64 nodeid, struct inode *inode, int flags, int isdir);
	365
04730fef MS	366	/**
	367	* Send RELEASE or RELEASEDIR request
	368	*/
	369	int fuse_release_common(struct inode inode, struct file file, int isdir);
	370
82547981 MS	371	/**
	372	* Send FSYNC or FSYNCDIR request
	373	*/
	374	int fuse_fsync_common(struct file file, struct dentry de, int datasync,
	375	int isdir);
	376
b6aeaded	377	/**
1779381d	378	* Initialize file operations on a regular file
b6aeaded MS	379	*/
	380	void fuse_init_file_inode(struct inode *inode);
	381
e5e5558e	382	/**
1779381d	383	* Initialize inode operations on regular files and special files
e5e5558e MS	384	*/
	385	void fuse_init_common(struct inode *inode);
	386
	387	/**
1779381d	388	* Initialize inode and file operations on a directory
e5e5558e MS	389	*/
	390	void fuse_init_dir(struct inode *inode);
	391
	392	/**
1779381d	393	* Initialize inode operations on a symlink
e5e5558e MS	394	*/
	395	void fuse_init_symlink(struct inode *inode);
	396
	397	/**
	398	* Change attributes of an inode
	399	*/
	400	void fuse_change_attributes(struct inode inode, struct fuse_attr attr);
	401
d8a5ba45 MS	402	/**
	403	* Check if the connection can be released, and if yes, then free the
	404	* connection structure
	405	*/
	406	void fuse_release_conn(struct fuse_conn *fc);
	407
334f485d MS	408	/**
	409	* Initialize the client device
	410	*/
	411	int fuse_dev_init(void);
	412
	413	/**
	414	* Cleanup the client device
	415	*/
	416	void fuse_dev_cleanup(void);
	417
	418	/**
	419	* Allocate a request
	420	*/
	421	struct fuse_req *fuse_request_alloc(void);
	422
	423	/**
	424	* Free a request
	425	*/
	426	void fuse_request_free(struct fuse_req *req);
	427
	428	/**
	429	* Reinitialize a request, the preallocated flag is left unmodified
	430	*/
	431	void fuse_reset_request(struct fuse_req *req);
	432
	433	/**
	434	* Reserve a preallocated request
	435	*/
	436	struct fuse_req fuse_get_request(struct fuse_conn fc);
	437
334f485d MS	438	/**
334f485d MS	439	* Decrement reference count of a request. If count goes to zero put
1779381d	440	* on unused list (preallocated) or free request (not preallocated).
334f485d MS	441	*/
	442	void fuse_put_request(struct fuse_conn fc, struct fuse_req req);
	443
	444	/**
7c352bdf	445	* Send a request (synchronous)
334f485d MS	446	*/
	447	void request_send(struct fuse_conn fc, struct fuse_req req);
	448
334f485d MS	449	/**
	450	* Send a request with no reply
	451	*/
	452	void request_send_noreply(struct fuse_conn fc, struct fuse_req req);
	453
	454	/**
	455	* Send a request in the background
	456	*/
	457	void request_send_background(struct fuse_conn fc, struct fuse_req req);
	458
1e9a4ed9	459	/**
1779381d	460	* Release inodes and file associated with background request
1e9a4ed9 MS	461	*/
	462	void fuse_release_background(struct fuse_req *req);
	463
e5e5558e MS	464	/**
	465	* Get the attributes of a file
	466	*/
	467	int fuse_do_getattr(struct inode *inode);
	468
	469	/**
	470	* Invalidate inode attributes
	471	*/
	472	void fuse_invalidate_attr(struct inode *inode);
	473
334f485d MS	474	/**
	475	* Send the INIT message
	476	*/
	477	void fuse_send_init(struct fuse_conn *fc);