diff options
| -rw-r--r-- | Documentation/DocBook/kernel-api.tmpl | 16 | ||||
| -rw-r--r-- | kernel/relay.c | 36 |
2 files changed, 38 insertions, 14 deletions
diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl index f8fe882e33d..ea6f375475b 100644 --- a/Documentation/DocBook/kernel-api.tmpl +++ b/Documentation/DocBook/kernel-api.tmpl @@ -202,6 +202,22 @@ X!Ilib/string.c </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> diff --git a/kernel/relay.c b/kernel/relay.c index 85786ff2a4f..1d63ecddfa7 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -95,7 +95,7 @@ int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma) * @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) @@ -132,10 +132,9 @@ depopulate: /** * 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) { @@ -163,6 +162,7 @@ free_buf: /** * relay_destroy_channel - free the channel struct + * @kref: target kernel reference that contains the relay channel * * Should only be called from kref_put(). */ @@ -194,6 +194,7 @@ void relay_destroy_buf(struct rchan_buf *buf) /** * 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 @@ -374,7 +375,7 @@ void relay_reset(struct rchan *chan) } EXPORT_SYMBOL_GPL(relay_reset); -/** +/* * relay_open_buf - create a new relay channel buffer * * Internal - used by relay_open(). @@ -448,12 +449,12 @@ static inline void setup_callbacks(struct rchan *chan, /** * 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 @@ -585,7 +586,7 @@ EXPORT_SYMBOL_GPL(relay_switch_subbuf); * 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, @@ -641,7 +642,7 @@ EXPORT_SYMBOL_GPL(relay_close); * 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) { @@ -729,7 +730,7 @@ static int relay_file_release(struct inode *inode, struct file *filp) return 0; } -/** +/* * relay_file_read_consume - update the consumed count for the buffer */ static void relay_file_read_consume(struct rchan_buf *buf, @@ -756,7 +757,7 @@ 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) @@ -793,6 +794,8 @@ 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) @@ -818,6 +821,8 @@ static size_t relay_file_read_subbuf_avail(size_t read_pos, /** * 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 @@ -844,6 +849,9 @@ static size_t relay_file_read_start_pos(size_t read_pos, /** * 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, @@ -865,7 +873,7 @@ static size_t relay_file_read_end_pos(struct rchan_buf *buf, return end_pos; } -/** +/* * subbuf_read_actor - read up to one subbuf's worth of data */ static int subbuf_read_actor(size_t read_start, @@ -890,7 +898,7 @@ 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, @@ -933,7 +941,7 @@ typedef int (*subbuf_actor_t) (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, |