[PATCH] kernel-doc for relay interface

     </sect1>

  </chapter>

  <chapter id="relayfs">

     <title>relay interface support</title>

     <para>

	Relay interface support

	is designed to provide an efficient mechanism for tools and

	facilities to relay large amounts of data from kernel space to

	user space.

     </para>

     <sect1><title>relay interface</title>

!Ekernel/relay.c

!Ikernel/relay.c

     </sect1>

  </chapter>

  <chapter id="vfs">

     <title>The Linux VFS</title>

     <sect1><title>The Filesystem types</title>

 *	@buf: the buffer struct

 *	@size: total size of the buffer

 *

 *	Returns a pointer to the resulting buffer, NULL if unsuccessful. The

 *	Returns a pointer to the resulting buffer, %NULL if unsuccessful. The

 *	passed in size will get page aligned, if it isn't already.

 */

static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)

/**

 *	relay_create_buf - allocate and initialize a channel buffer

 *	@alloc_size: size of the buffer to allocate

 *	@n_subbufs: number of sub-buffers in the channel

 *	@chan: the relay channel

 *

 *	Returns channel buffer if successful, NULL otherwise

 *	Returns channel buffer if successful, %NULL otherwise.

 */

struct rchan_buf *relay_create_buf(struct rchan *chan)

{

/**

 *	relay_destroy_channel - free the channel struct

 *	@kref: target kernel reference that contains the relay channel

 *

 *	Should only be called from kref_put().

 */

/**

 *	relay_remove_buf - remove a channel buffer

 *	@kref: target kernel reference that contains the relay buffer

 *

 *	Removes the file from the fileystem, which also frees the

 *	rchan_buf_struct and the channel buffer.  Should only be called from

}

EXPORT_SYMBOL_GPL(relay_reset);

/**

/*

 *	relay_open_buf - create a new relay channel buffer

 *

 *	Internal - used by relay_open().

/**

 *	relay_open - create a new relay channel

 *	@base_filename: base name of files to create

 *	@parent: dentry of parent directory, NULL for root directory

 *	@parent: dentry of parent directory, %NULL for root directory

 *	@subbuf_size: size of sub-buffers

 *	@n_subbufs: number of sub-buffers

 *	@cb: client callback functions

 *

 *	Returns channel pointer if successful, NULL otherwise.

 *	Returns channel pointer if successful, %NULL otherwise.

 *

 *	Creates a channel buffer for each cpu using the sizes and

 *	attributes specified.  The created channel buffer files

 *	subbufs_consumed should be the number of sub-buffers newly consumed,

 *	not the total consumed.

 *

 *	NOTE: kernel clients don't need to call this function if the channel

 *	NOTE: Kernel clients don't need to call this function if the channel

 *	mode is 'overwrite'.

 */

void relay_subbufs_consumed(struct rchan *chan,

 *	relay_flush - close the channel

 *	@chan: the channel

 *

 *	Flushes all channel buffers i.e. forces buffer switch.

 *	Flushes all channel buffers, i.e. forces buffer switch.

 */

void relay_flush(struct rchan *chan)

{

	return 0;

}

/**

/*

 *	relay_file_read_consume - update the consumed count for the buffer

 */

static void relay_file_read_consume(struct rchan_buf *buf,

	}

}

/**

/*

 *	relay_file_read_avail - boolean, are there unconsumed bytes available?

 */

static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)

/**

 *	relay_file_read_subbuf_avail - return bytes available in sub-buffer

 *	@read_pos: file read position

 *	@buf: relay channel buffer

 */

static size_t relay_file_read_subbuf_avail(size_t read_pos,

					   struct rchan_buf *buf)

/**

 *	relay_file_read_start_pos - find the first available byte to read

 *	@read_pos: file read position

 *	@buf: relay channel buffer

 *

 *	If the read_pos is in the middle of padding, return the

 *	position of the first actually available byte, otherwise

/**

 *	relay_file_read_end_pos - return the new read position

 *	@read_pos: file read position

 *	@buf: relay channel buffer

 *	@count: number of bytes to be read

 */

static size_t relay_file_read_end_pos(struct rchan_buf *buf,

				      size_t read_pos,

	return end_pos;

}

/**

/*

 *	subbuf_read_actor - read up to one subbuf's worth of data

 */

static int subbuf_read_actor(size_t read_start,

	return ret;

}

/**

/*

 *	subbuf_send_actor - send up to one subbuf's worth of data

 */

static int subbuf_send_actor(size_t read_start,

			       read_descriptor_t *desc,

			       read_actor_t actor);

/**

/*

 *	relay_file_read_subbufs - read count bytes, bridging subbuf boundaries

 */

static inline ssize_t relay_file_read_subbufs(struct file *filp,