nilfs2: split out nilfs_get_root_dentry

This splits the code to allocate root dentry into a separate routine
for convenience in successive changes.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index acfa74e..1e12930 100644 (file)
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -750,6 +750,39 @@ int nilfs_check_feature_compatibility(struct super_block *sb,
        return 0;
 }
 
+static int nilfs_get_root_dentry(struct super_block *sb,
+                                struct nilfs_root *root,
+                                struct dentry **root_dentry)
+{
+       struct inode *inode;
+       struct dentry *dentry;
+       int ret = 0;
+
+       inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
+       if (IS_ERR(inode)) {
+               printk(KERN_ERR "NILFS: get root inode failed\n");
+               ret = PTR_ERR(inode);
+               goto out;
+       }
+       if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
+               iput(inode);
+               printk(KERN_ERR "NILFS: corrupt root inode.\n");
+               ret = -EINVAL;
+               goto out;
+       }
+
+       dentry = d_alloc_root(inode);
+       if (!dentry) {
+               iput(inode);
+               printk(KERN_ERR "NILFS: get root dentry failed\n");
+               ret = -ENOMEM;
+               goto out;
+       }
+       *root_dentry = dentry;
+ out:
+       return ret;
+}
+
 /**
  * nilfs_fill_super() - initialize a super block instance
  * @sb: super_block
@@ -766,7 +799,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
 {
        struct nilfs_sb_info *sbi;
        struct nilfs_root *fsroot;
-       struct inode *root;
        __u64 cno;
        int err, curr_mnt;
 
@@ -850,25 +882,9 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
                        goto failed_checkpoint;
        }
 
-       root = nilfs_iget(sb, fsroot, NILFS_ROOT_INO);
-       if (IS_ERR(root)) {
-               printk(KERN_ERR "NILFS: get root inode failed\n");
-               err = PTR_ERR(root);
-               goto failed_segctor;
-       }
-       if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
-               iput(root);
-               printk(KERN_ERR "NILFS: corrupt root inode.\n");
-               err = -EINVAL;
-               goto failed_segctor;
-       }
-       sb->s_root = d_alloc_root(root);
-       if (!sb->s_root) {
-               iput(root);
-               printk(KERN_ERR "NILFS: get root dentry failed\n");
-               err = -ENOMEM;
+       err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
+       if (err)
                goto failed_segctor;
-       }
 
        nilfs_put_root(fsroot);