nilfs2: set pointer to root object in inodes

This puts a pointer to nilfs_root object in the private part of
on-memory inode, and makes nilfs_iget function pick up the inode with
the same root object.

Non-root inodes inherit its nilfs_root object from parent inode.  That
of the root inode is allocated through nilfs_attach_checkpoint()
function.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index ad6ed2cf19b4..1110d56a23f5 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -70,7 +70,7 @@ nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
         ino = nilfs_inode_by_name(dir, &dentry->d_name);
         inode = NULL;
         if (ino) {
-                inode = nilfs_iget(dir->i_sb, ino);
+                inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino);
                 if (IS_ERR(inode))
                         return ERR_CAST(inode);
         }
@@ -87,7 +87,8 @@ struct dentry *nilfs_get_parent(struct dentry *child)
         if (!ino)
                 return ERR_PTR(-ENOENT);
 
-        inode = nilfs_iget(child->d_inode->i_sb, ino);
+        inode = nilfs_iget(child->d_inode->i_sb,
+                           NILFS_I(child->d_inode)->i_root, ino);
         if (IS_ERR(inode))
                 return ERR_CAST(inode);
         return d_obtain_alias(inode);