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authorEric Van Hensbergen <ericvh@ericvh-desktop.(none)>2008-03-05 07:08:09 -0600
committerEric Van Hensbergen <ericvh@opteron.9grid.us>2008-05-14 19:23:25 -0500
commitee443996a35c1e04f210cafd43d5a98d41e46085 (patch)
tree58ee72b69a02d9dbb3a98e402a4561baba0eb9a8 /net/9p/trans_fd.c
parentb32a09db4fb9a87246ba4e7726a979ac4709ad97 (diff)
downloadlinux-2.6.38-lt-ux500-ee443996a35c1e04f210cafd43d5a98d41e46085.tar.gz
9p: Documentation updates
The kernel-doc comments of much of the 9p system have been in disarray since reorganization. This patch fixes those problems, adds additional documentation and a template book which collects the 9p information. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p/trans_fd.c')
-rw-r--r--net/9p/trans_fd.c146
1 files changed, 124 insertions, 22 deletions
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index f624dff7685..c6eda999fa7 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -47,12 +47,29 @@
#define SCHED_TIMEOUT 10
#define MAXPOLLWADDR 2
+/**
+ * struct p9_fd_opts - per-transport options
+ * @rfd: file descriptor for reading (trans=fd)
+ * @wfd: file descriptor for writing (trans=fd)
+ * @port: port to connect to (trans=tcp)
+ *
+ */
+
struct p9_fd_opts {
int rfd;
int wfd;
u16 port;
};
+
+/**
+ * struct p9_trans_fd - transport state
+ * @rd: reference to file to read from
+ * @wr: reference of file to write to
+ * @conn: connection state reference
+ *
+ */
+
struct p9_trans_fd {
struct file *rd;
struct file *wr;
@@ -90,10 +107,24 @@ enum {
};
struct p9_req;
-
typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
+
+/**
+ * struct p9_req - fd mux encoding of an rpc transaction
+ * @lock: protects req_list
+ * @tag: numeric tag for rpc transaction
+ * @tcall: request &p9_fcall structure
+ * @rcall: response &p9_fcall structure
+ * @err: error state
+ * @cb: callback for when response is received
+ * @cba: argument to pass to callback
+ * @flush: flag to indicate RPC has been flushed
+ * @req_list: list link for higher level objects to chain requests
+ *
+ */
+
struct p9_req {
- spinlock_t lock; /* protect request structure */
+ spinlock_t lock;
int tag;
struct p9_fcall *tcall;
struct p9_fcall *rcall;
@@ -104,7 +135,39 @@ struct p9_req {
struct list_head req_list;
};
-struct p9_mux_poll_task;
+struct p9_mux_poll_task {
+ struct task_struct *task;
+ struct list_head mux_list;
+ int muxnum;
+};
+
+/**
+ * struct p9_conn - fd mux connection state information
+ * @lock: protects mux_list (?)
+ * @mux_list: list link for mux to manage multiple connections (?)
+ * @poll_task: task polling on this connection
+ * @msize: maximum size for connection (dup)
+ * @extended: 9p2000.u flag (dup)
+ * @trans: reference to transport instance for this connection
+ * @tagpool: id accounting for transactions
+ * @err: error state
+ * @equeue: event wait_q (?)
+ * @req_list: accounting for requests which have been sent
+ * @unsent_req_list: accounting for requests that haven't been sent
+ * @rcall: current response &p9_fcall structure
+ * @rpos: read position in current frame
+ * @rbuf: current read buffer
+ * @wpos: write position for current frame
+ * @wsize: amount of data to write for current frame
+ * @wbuf: current write buffer
+ * @poll_wait: array of wait_q's for various worker threads
+ * @poll_waddr: ????
+ * @pt: poll state
+ * @rq: current read work
+ * @wq: current write work
+ * @wsched: ????
+ *
+ */
struct p9_conn {
spinlock_t lock; /* protect lock structure */
@@ -132,11 +195,16 @@ struct p9_conn {
unsigned long wsched;
};
-struct p9_mux_poll_task {
- struct task_struct *task;
- struct list_head mux_list;
- int muxnum;
-};
+/**
+ * struct p9_mux_rpc - fd mux rpc accounting structure
+ * @m: connection this request was issued on
+ * @err: error state
+ * @tcall: request &p9_fcall
+ * @rcall: response &p9_fcall
+ * @wqueue: wait queue that client is blocked on for this rpc
+ *
+ * Bug: isn't this information duplicated elsewhere like &p9_req
+ */
struct p9_mux_rpc {
struct p9_conn *m;
@@ -207,10 +275,12 @@ static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
/**
* p9_mux_calc_poll_procs - calculates the number of polling procs
- * based on the number of mounted v9fs filesystems.
+ * @muxnum: number of mounts
*
+ * Calculation is based on the number of mounted v9fs filesystems.
* The current implementation returns sqrt of the number of mounts.
*/
+
static int p9_mux_calc_poll_procs(int muxnum)
{
int n;
@@ -331,12 +401,11 @@ static void p9_mux_poll_stop(struct p9_conn *m)
/**
* p9_conn_create - allocate and initialize the per-session mux data
- * Creates the polling task if this is the first session.
+ * @trans: transport structure
*
- * @trans - transport structure
- * @msize - maximum message size
- * @extended - extended flag
+ * Note: Creates the polling task if this is the first session.
*/
+
static struct p9_conn *p9_conn_create(struct p9_trans *trans)
{
int i, n;
@@ -406,7 +475,10 @@ static struct p9_conn *p9_conn_create(struct p9_trans *trans)
/**
* p9_mux_destroy - cancels all pending requests and frees mux resources
+ * @m: mux to destroy
+ *
*/
+
static void p9_conn_destroy(struct p9_conn *m)
{
P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
@@ -429,9 +501,14 @@ static void p9_conn_destroy(struct p9_conn *m)
}
/**
- * p9_pollwait - called by files poll operation to add v9fs-poll task
- * to files wait queue
+ * p9_pollwait - add poll task to the wait queue
+ * @filp: file pointer being polled
+ * @wait_address: wait_q to block on
+ * @p: poll state
+ *
+ * called by files poll operation to add v9fs-poll task to files wait queue
*/
+
static void
p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
{
@@ -462,7 +539,10 @@ p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
/**
* p9_poll_mux - polls a mux and schedules read or write works if necessary
+ * @m: connection to poll
+ *
*/
+
static void p9_poll_mux(struct p9_conn *m)
{
int n;
@@ -499,9 +579,14 @@ static void p9_poll_mux(struct p9_conn *m)
}
/**
- * p9_poll_proc - polls all v9fs transports for new events and queues
- * the appropriate work to the work queue
+ * p9_poll_proc - poll worker thread
+ * @a: thread state and arguments
+ *
+ * polls all v9fs transports for new events and queues the appropriate
+ * work to the work queue
+ *
*/
+
static int p9_poll_proc(void *a)
{
struct p9_conn *m, *mtmp;
@@ -527,7 +612,10 @@ static int p9_poll_proc(void *a)
/**
* p9_write_work - called when a transport can send some data
+ * @work: container for work to be done
+ *
*/
+
static void p9_write_work(struct work_struct *work)
{
int n, err;
@@ -638,7 +726,10 @@ static void process_request(struct p9_conn *m, struct p9_req *req)
/**
* p9_read_work - called when there is some data to be read from a transport
+ * @work: container of work to be done
+ *
*/
+
static void p9_read_work(struct work_struct *work)
{
int n, err;
@@ -793,7 +884,9 @@ error:
* @tc: request to be sent
* @cb: callback function to call when response is received
* @cba: parameter to pass to the callback function
+ *
*/
+
static struct p9_req *p9_send_request(struct p9_conn *m,
struct p9_fcall *tc,
p9_conn_req_callback cb, void *cba)
@@ -961,10 +1054,12 @@ p9_conn_rpc_cb(struct p9_req *req, void *a)
/**
* p9_fd_rpc- sends 9P request and waits until a response is available.
* The function can be interrupted.
- * @m: mux data
+ * @t: transport data
* @tc: request to be sent
* @rc: pointer where a pointer to the response is stored
+ *
*/
+
int
p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
{
@@ -1041,8 +1136,10 @@ p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
* @m: mux data
* @tc: request to be sent
* @cb: callback function to be called when response arrives
- * @cba: value to pass to the callback function
+ * @a: value to pass to the callback function
+ *
*/
+
int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
p9_conn_req_callback cb, void *a)
{
@@ -1065,7 +1162,9 @@ int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
* p9_conn_cancel - cancel all pending requests with error
* @m: mux data
* @err: error code
+ *
*/
+
void p9_conn_cancel(struct p9_conn *m, int err)
{
struct p9_req *req, *rtmp;
@@ -1099,7 +1198,7 @@ void p9_conn_cancel(struct p9_conn *m, int err)
/**
* v9fs_parse_options - parse mount options into session structure
* @options: options string passed from mount
- * @v9ses: existing v9fs session information
+ * @opts: transport-specific structure to parse options into
*
*/
@@ -1193,11 +1292,12 @@ static int p9_socket_open(struct p9_trans *trans, struct socket *csocket)
/**
* p9_fd_read- read from a fd
- * @v9ses: session information
+ * @trans: transport instance state
* @v: buffer to receive data into
* @len: size of receive buffer
*
*/
+
static int p9_fd_read(struct p9_trans *trans, void *v, int len)
{
int ret;
@@ -1220,11 +1320,12 @@ static int p9_fd_read(struct p9_trans *trans, void *v, int len)
/**
* p9_fd_write - write to a socket
- * @v9ses: session information
+ * @trans: transport instance state
* @v: buffer to send data from
* @len: size of send buffer
*
*/
+
static int p9_fd_write(struct p9_trans *trans, void *v, int len)
{
int ret;
@@ -1296,6 +1397,7 @@ end:
* @trans: private socket structure
*
*/
+
static void p9_fd_close(struct p9_trans *trans)
{
struct p9_trans_fd *ts;