configfs: don't bother with checks for mkdir/rmdir/unlink/symlink in root

just give root directory separate inode_operations without all those
methods...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 7 insertions, 15 deletions

diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index ede857d20a04..1b7fdc0a6a09 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -89,6 +89,7 @@ extern const struct file_operations configfs_dir_operations;
 extern const struct file_operations configfs_file_operations;
 extern const struct file_operations bin_fops;
 extern const struct inode_operations configfs_dir_inode_operations;
+extern const struct inode_operations configfs_root_inode_operations;
 extern const struct inode_operations configfs_symlink_inode_operations;
 extern const struct dentry_operations configfs_dentry_ops;
 
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 5ddd7ebd9dcd..b0fbcbeb03ee 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1183,11 +1183,6 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
         struct module *subsys_owner = NULL, *new_item_owner = NULL;
         char *name;
 
-        if (dentry->d_parent == configfs_sb->s_root) {
-                ret = -EPERM;
-                goto out;
-        }
-
         sd = dentry->d_parent->d_fsdata;
 
         /*
@@ -1359,9 +1354,6 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
         struct module *subsys_owner = NULL, *dead_item_owner = NULL;
         int ret;
 
-        if (dentry->d_parent == configfs_sb->s_root)
-                return -EPERM;
-
         sd = dentry->d_fsdata;
         if (sd->s_type & CONFIGFS_USET_DEFAULT)
                 return -EPERM;
@@ -1459,6 +1451,11 @@ const struct inode_operations configfs_dir_inode_operations = {
         .setattr        = configfs_setattr,
 };
 
+const struct inode_operations configfs_root_inode_operations = {
+        .lookup         = configfs_lookup,
+        .setattr        = configfs_setattr,
+};
+
 #if 0
 int configfs_rename_dir(struct config_item * item, const char *new_name)
 {
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index 07f60455f1c1..eb41adc28cfe 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -82,7 +82,7 @@ static int configfs_fill_super(struct super_block *sb, void *data, int silent)
         inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
                                    &configfs_root);
         if (inode) {
-                inode->i_op = &configfs_dir_inode_operations;
+                inode->i_op = &configfs_root_inode_operations;
                 inode->i_fop = &configfs_dir_operations;
                 /* directory inodes start off with i_nlink == 2 (for "." entry) */
                 inc_nlink(inode);
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index 0f3eb41d9201..2817153d33c2 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -141,10 +141,6 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
         struct config_item *target_item = NULL;
         struct config_item_type *type;
 
-        ret = -EPERM;  /* What lack-of-symlink returns */
-        if (dentry->d_parent == configfs_sb->s_root)
-                goto out;
-
         sd = dentry->d_parent->d_fsdata;
         /*
          * Fake invisibility if dir belongs to a group/default groups hierarchy
@@ -198,8 +194,6 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry)
         if (!(sd->s_type & CONFIGFS_ITEM_LINK))
                 goto out;
 
-        BUG_ON(dentry->d_parent == configfs_sb->s_root);
-
         sl = sd->s_element;
 
         parent_item = configfs_get_config_item(dentry->d_parent);