dgrp procfs fixes, part 6: just use proc_create{,_data}

->permission() of its own is a rudiment of sysctl imitation;
normal procfs logics will do just fine here, no need to
mess with ->proc_iops at all.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/staging/dgrp/dgrp_common.c

@@ -167,34 +167,3 @@ void dgrp_carrier(struct ch_struct *ch)
 		ch->ch_flag &= ~CH_PHYS_CD;
 
 }
-
-/**
- * dgrp_chk_perm() -- check permissions for net device
- * @inode: pointer to inode structure for the net communication device
- * @op: operation to be tested
- *
- * The file permissions and ownerships are tested to determine whether
- * the operation "op" is permitted on the file pointed to by the inode.
- * Returns 0 if the operation is permitted, -EACCESS otherwise
- */
-int dgrp_chk_perm(int mode, int op)
-{
-	if (!uid_eq(GLOBAL_ROOT_UID, current_euid()))
-		mode >>= 6;
-	else if (in_egroup_p(GLOBAL_ROOT_GID))
-		mode >>= 3;
-
-	if ((mode & op & 0007) == op)
-		return 0;
-
-	if (capable(CAP_SYS_ADMIN))
-		return 0;
-
-	return -EACCES;
-}
-
-/* dgrp_chk_perm wrapper for permission call in struct inode_operations */
-int dgrp_inode_permission(struct inode *inode, int op)
-{
-	return dgrp_chk_perm(inode->i_mode, op);
-}

drivers/staging/dgrp/dgrp_common.h

@@ -89,8 +89,6 @@ extern void dgrp_register_proc(void);
  *-----------------------------------------------------------------------*/
 
 void dgrp_carrier(struct ch_struct *ch);
-extern int dgrp_inode_permission(struct inode *inode, int op);
-extern int dgrp_chk_perm(int mode, int op);
 
 
 /*

drivers/staging/dgrp/dgrp_specproc.c

@@ -55,12 +55,6 @@ static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
 /* File operation declarations */
 static int parse_write_config(char *);
 
-
-static struct inode_operations proc_inode_ops = {
-	.permission = dgrp_inode_permission
-};
-
-
 static ssize_t dgrp_config_proc_write(struct file *file,
 				      const char __user *buffer,
 				      size_t count, loff_t *pos);
@@ -139,28 +133,15 @@ void dgrp_unregister_proc(void)
 
 void dgrp_register_proc(void)
 {
-	struct proc_dir_entry *de;
 	/*
 	 *	Register /proc/dgrp
 	 */
 	dgrp_proc_dir_entry = proc_mkdir("dgrp", NULL);
 	if (!dgrp_proc_dir_entry)
 		return;
-	de = create_proc_entry("dgrp/config", 0644, NULL);
-	if (de) {
-		de->proc_fops = &config_proc_file_ops;
-		de->proc_iops = &proc_inode_ops;
-	}
-	de = create_proc_entry("dgrp/info", 0644, NULL);
-	if (de) {
-		de->proc_fops = &info_proc_file_ops;
-		de->proc_iops = &proc_inode_ops;
-	}
-	de = create_proc_entry("dgrp/nodeinfo", 0644, NULL);
-	if (de) {
-		de->proc_fops = &nodeinfo_proc_file_ops;
-		de->proc_iops = &proc_inode_ops;
-	}
+	proc_create("dgrp/config", 0644, NULL, &config_proc_file_ops);
+	proc_create("dgrp/info", 0644, NULL, &info_proc_file_ops);
+	proc_create("dgrp/nodeinfo", 0644, NULL, &nodeinfo_proc_file_ops);
 	net_entry_pointer = proc_mkdir_mode("dgrp/net", 0500, NULL);
 	mon_entry_pointer = proc_mkdir_mode("dgrp/mon", 0500, NULL);
 	dpa_entry_pointer = proc_mkdir_mode("dgrp/dpa", 0500, NULL);
@@ -554,15 +535,6 @@ static struct proc_dir_entry *add_proc_file(struct nd_struct *node,
 				 const struct file_operations *fops)
 {
 	char buf[3];
-	struct proc_dir_entry *de;
-
 	ID_TO_CHAR(node->nd_ID, buf);
-
-	de = create_proc_entry(buf, 0600 | S_IFREG, root);
-	if (de) {
-		de->data = (void *) node;
-		de->proc_fops = fops;
-		de->proc_iops = &proc_inode_ops;
-	}
-	return de;
+	return proc_create_data(buf, 0600, root, fops, node);
 }