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Date: Tue, 16 Apr 2013 19:27:13 +0100
From: David Howells <dhowells@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org, devel@...verdev.osuosl.org,
Tommi Rantala <tt.rantala@...il.com>,
Bill Pemberton <wfp5p@...ginia.edu>, viro@...iv.linux.org.uk
Subject: [PATCH 21/28] dgrp: Clean up the use of procfs [RFC]
Clean up the use of procfs by the dgrp driver:
(1) Use remove_proc_subtree() for the mass slaughter of a subdir full of proc
files rather than doing it manually.
(2) When creating files, only call ID_TO_CHAR() once to generate the name.
Signed-off-by : David Howells <dhowells@...hat.com>
cc: Bill Pemberton <wfp5p@...ginia.edu>
cc: Tommi Rantala <tt.rantala@...il.com>
cc: devel@...verdev.osuosl.org
---
drivers/staging/dgrp/dgrp_specproc.c | 82 ++++++++++++----------------------
1 file changed, 28 insertions(+), 54 deletions(-)
diff --git a/drivers/staging/dgrp/dgrp_specproc.c b/drivers/staging/dgrp/dgrp_specproc.c
index 205d80e..e3c16a9 100644
--- a/drivers/staging/dgrp/dgrp_specproc.c
+++ b/drivers/staging/dgrp/dgrp_specproc.c
@@ -45,13 +45,8 @@
#include "dgrp_common.h"
-static struct proc_dir_entry *dgrp_proc_dir_entry;
-
static int dgrp_add_id(long id);
static int dgrp_remove_nd(struct nd_struct *nd);
-static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
- struct proc_dir_entry *root,
- const struct file_operations *fops);
/* File operation declarations */
static int parse_write_config(char *);
@@ -94,51 +89,23 @@ static struct proc_dir_entry *mon_entry_pointer;
static struct proc_dir_entry *dpa_entry_pointer;
static struct proc_dir_entry *ports_entry_pointer;
-static void remove_files(struct nd_struct *nd)
-{
- char buf[3];
- ID_TO_CHAR(nd->nd_ID, buf);
- dgrp_remove_node_class_sysfs_files(nd);
- if (nd->nd_net_de)
- remove_proc_entry(buf, net_entry_pointer);
- if (nd->nd_mon_de)
- remove_proc_entry(buf, mon_entry_pointer);
- if (nd->nd_dpa_de)
- remove_proc_entry(buf, dpa_entry_pointer);
- if (nd->nd_ports_de)
- remove_proc_entry(buf, ports_entry_pointer);
-}
-
void dgrp_unregister_proc(void)
{
+ struct nd_struct *nd;
+
net_entry_pointer = NULL;
mon_entry_pointer = NULL;
dpa_entry_pointer = NULL;
ports_entry_pointer = NULL;
- if (dgrp_proc_dir_entry) {
- struct nd_struct *nd;
- list_for_each_entry(nd, &nd_struct_list, list)
- remove_files(nd);
- remove_proc_entry("dgrp/config", NULL);
- remove_proc_entry("dgrp/info", NULL);
- remove_proc_entry("dgrp/nodeinfo", NULL);
- remove_proc_entry("dgrp/net", NULL);
- remove_proc_entry("dgrp/mon", NULL);
- remove_proc_entry("dgrp/dpa", NULL);
- remove_proc_entry("dgrp/ports", NULL);
- remove_proc_entry("dgrp", NULL);
- dgrp_proc_dir_entry = NULL;
- }
+ list_for_each_entry(nd, &nd_struct_list, list)
+ dgrp_remove_node_class_sysfs_files(nd);
+ remove_proc_subtree("dgrp", NULL);
}
void dgrp_register_proc(void)
{
- /*
- * Register /proc/dgrp
- */
- dgrp_proc_dir_entry = proc_mkdir("dgrp", NULL);
- if (!dgrp_proc_dir_entry)
+ if (!proc_mkdir("dgrp", NULL))
return;
proc_create("dgrp/config", 0644, NULL, &config_proc_file_ops);
proc_create("dgrp/info", 0644, NULL, &info_proc_file_ops);
@@ -455,6 +422,14 @@ static int dgrp_nodeinfo_proc_open(struct inode *inode, struct file *file)
return seq_open(file, &nodeinfo_ops);
}
+static struct proc_dir_entry *add_proc_file(struct nd_struct *nd,
+ const char *name,
+ struct proc_dir_entry *root,
+ const struct file_operations *fops)
+{
+ return proc_create_data(name, 0600, root, fops, nd);
+}
+
/**
* dgrp_add_id() -- creates new nd struct and adds it to list
* @id: id of device to add
@@ -462,6 +437,7 @@ static int dgrp_nodeinfo_proc_open(struct inode *inode, struct file *file)
static int dgrp_add_id(long id)
{
struct nd_struct *nd;
+ char name[3];
int ret;
int i;
@@ -496,11 +472,11 @@ static int dgrp_add_id(long id)
goto error_out;
dgrp_create_node_class_sysfs_files(nd);
- nd->nd_net_de = add_proc_file(nd, net_entry_pointer, &dgrp_net_ops);
- nd->nd_mon_de = add_proc_file(nd, mon_entry_pointer, &dgrp_mon_ops);
- nd->nd_dpa_de = add_proc_file(nd, dpa_entry_pointer, &dgrp_dpa_ops);
- nd->nd_ports_de = add_proc_file(nd, ports_entry_pointer,
- &dgrp_ports_ops);
+ ID_TO_CHAR(nd->nd_ID, name);
+ add_proc_file(nd, name, net_entry_pointer, &dgrp_net_ops);
+ add_proc_file(nd, name, mon_entry_pointer, &dgrp_mon_ops);
+ add_proc_file(nd, name, dpa_entry_pointer, &dgrp_dpa_ops);
+ add_proc_file(nd, name, ports_entry_pointer, &dgrp_ports_ops);
return 0;
/* FIXME this guy should free the tty driver stored in nd and destroy
@@ -513,13 +489,20 @@ error_out:
static int dgrp_remove_nd(struct nd_struct *nd)
{
+ char name[3];
int ret;
/* Check to see if the selected structure is in use */
if (nd->nd_tty_ref_cnt)
return -EBUSY;
- remove_files(nd);
+
+ dgrp_remove_node_class_sysfs_files(nd);
+ ID_TO_CHAR(nd->nd_ID, name);
+ remove_proc_entry(name, net_entry_pointer);
+ remove_proc_entry(name, mon_entry_pointer);
+ remove_proc_entry(name, dpa_entry_pointer);
+ remove_proc_entry(name, ports_entry_pointer);
dgrp_tty_uninit(nd);
@@ -530,12 +513,3 @@ static int dgrp_remove_nd(struct nd_struct *nd)
kfree(nd);
return 0;
}
-
-static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
- struct proc_dir_entry *root,
- const struct file_operations *fops)
-{
- char buf[3];
- ID_TO_CHAR(node->nd_ID, buf);
- return proc_create_data(buf, 0600, root, fops, node);
-}
--
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