>From 82f635e6ecafe74c70269babfb0e0bb0e7db99db Mon Sep 17 00:00:00 2001
From: Sergiu Ivanov <unlimitedscol...@gmail.com>
Date: Mon, 10 Aug 2009 20:13:26 +0300
Subject: [PATCH] Add the .MASTER node to the eth-multiplexer.
* eth-multiplexer/device_impl.c (ds_device_open): Handle
the .MASTER node specially.
* eth-multiplexer/multiplexer.c (main): Create the .MASTER
node.
* eth-multiplexer/netfs_impl.c (master_node): New variable.
(lookup): Handle the lookups for .MASTER specially.
(netfs_add_dirents): Add the .MASTER node.
* eth-multiplexer/netfs_impl.h (MASTER_NODE_NAME): New
definition.
(master_node): New variable.
---
eth-multiplexer/device_impl.c | 21 ++++++++++++++++++++-
eth-multiplexer/multiplexer.c | 6 +++++-
eth-multiplexer/netfs_impl.c | 21 ++++++++++++++++++++-
eth-multiplexer/netfs_impl.h | 8 ++++++++
4 files changed, 53 insertions(+), 3 deletions(-)
diff --git a/eth-multiplexer/device_impl.c b/eth-multiplexer/device_impl.c
index abbd146..6aa27dd 100644
--- a/eth-multiplexer/device_impl.c
+++ b/eth-multiplexer/device_impl.c
@@ -116,7 +116,26 @@ ds_device_open (mach_port_t master_port, mach_port_t
reply_port,
ln->st = ln->n->nn_stat;
}
- dev = (struct vether_device *) pi->po->np->nn->ln;
+ if (pi->po->np == master_node)
+ {
+ /* This device_open RPC was invoked on a port the .MASTER node,
+ so we don't care about light nodes (because the .MASTER node
+ does not have one). */
+ extern struct port_bucket *port_bucket;
+ extern struct port_class *vdev_portclass;
+
+ /* Create a new virtual device. */
+ dev = (struct lnode *) add_vdev (name, sizeof (*dev), vdev_portclass,
+ port_bucket);
+ if (dev == NULL)
+ {
+ ports_port_deref (pi);
+ return D_NO_MEMORY;
+ }
+ }
+ else
+ dev = (struct vether_device *) pi->po->np->nn->ln;
+
/* check the mode */
openstat = pi->po->openstat;
if ((openstat & O_READ) && !(mode & D_READ))
diff --git a/eth-multiplexer/multiplexer.c b/eth-multiplexer/multiplexer.c
index 173a8f9..a87c9c4 100644
--- a/eth-multiplexer/multiplexer.c
+++ b/eth-multiplexer/multiplexer.c
@@ -162,9 +162,13 @@ main (int argc, char *argv[])
if (err)
error (5, err, "Cannot create root node");
+ err = new_node (NULL, &master_node);
+ if (err)
+ error (6, err, "Cannot create the .MASTER node");
+
err = io_stat (root_file, &underlying_node_stat);
if (err)
- error (6, err, "Cannot stat underlying node");
+ error (7, err, "Cannot stat underlying node");
struct stat stat = underlying_node_stat;
/* If the underlying node is not a directory, increase its permissions */
diff --git a/eth-multiplexer/netfs_impl.c b/eth-multiplexer/netfs_impl.c
index c70701b..875ff48 100644
--- a/eth-multiplexer/netfs_impl.c
+++ b/eth-multiplexer/netfs_impl.c
@@ -31,6 +31,10 @@
#include "vdev.h"
#include "util.h"
+/* The .MASTER node which will be used by static instances of
+ devnode. */
+struct node * master_node;
+
#define DIRENTS_CHUNK_SIZE (8*1024)
/* Returned directory entries are aligned to blocks this many bytes long.
* Must be a power of two. */
@@ -85,6 +89,18 @@ new_node (struct lnode *ln, struct node **np)
struct node *
lookup (char *name)
{
+ if (strcmp(name, MASTER_NODE_NAME) == 0)
+ {
+ netfs_nref (master_node);
+
+ /* netfs_attempt_lookup expects the returned node not to be
+ locked, while `master_node` might have been locked in the
+ previous lookups. */
+ mutex_unlock (&master_node->lock);
+
+ return master_node;
+ }
+
struct lnode *ln = (struct lnode *) lookup_dev_by_name (name);
char *copied_name = malloc (strlen (name) + 1);
@@ -276,10 +292,13 @@ netfs_get_dirents (struct iouser *cred, struct node *dir,
if (!err)
{
data_p = *data;
- if (first_entry < 2 + get_dev_num ())
+ /* Count the .MASTER node, too. */
+ if (first_entry < 2 + get_dev_num () + 1)
{
add_dirent (".", 2, DT_DIR);
add_dirent ("..", 2, DT_DIR);
+ add_dirent (MASTER_NODE_NAME, 2, DT_CHR);
+
foreach_dev_do (add_each_dev);
}
diff --git a/eth-multiplexer/netfs_impl.h b/eth-multiplexer/netfs_impl.h
index ec3b389..1c9662a 100644
--- a/eth-multiplexer/netfs_impl.h
+++ b/eth-multiplexer/netfs_impl.h
@@ -29,6 +29,10 @@
/* Shows the stat information in the node is invalid. */
#define NODE_STAT_INVALID 0x0001
+/* The name of the node which provides the pseudo master device port
+ functionality for static instances of devnode. */
+#define MASTER_NODE_NAME ".MASTER"
+
struct netnode
{
struct lnode *ln;
@@ -47,6 +51,10 @@ struct lnode
extern file_t root_file;
volatile struct mapped_time_value *multiplexer_maptime;
+/* The .MASTER node which will be used by static instances of
+ devnode. */
+extern struct node * master_node;
+
error_t new_node (struct lnode *ln, struct node **np);
#endif
--
1.5.2.4
