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Btrfs: Fix NFS exporting of subvol roots.
Date: Tue, 19 Aug 2008 22:20:17 +0100 btrfs_lookup_fs_root() only finds subvol roots which have already been seen and put into the cache. For btrfs_get_dentry() we actually have to go to the medium -- so use btrfs_read_fs_root_no_name() instead. In btrfs_get_parent(), notice when we've hit the root of the subvolume and return the real root instead. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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1 changed files with 12 additions and 1 deletions
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@ -71,11 +71,18 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
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struct dentry *result;
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struct btrfs_key key;
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key.objectid = root_objectid;
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btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
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key.offset = (u64)-1;
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root = btrfs_read_fs_root_no_name(btrfs_sb(sb)->fs_info, &key);
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if (IS_ERR(root))
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return ERR_CAST(root);
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key.objectid = objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
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key.offset = 0;
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root = btrfs_lookup_fs_root(btrfs_sb(sb)->fs_info, root_objectid);
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inode = btrfs_iget(sb, &key, root, NULL);
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if (IS_ERR(inode))
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return (void *)inode;
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@ -178,6 +185,10 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
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objectid = key.offset;
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/* If we are already at the root of a subvol, return the real root */
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if (objectid == dir->i_ino)
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return dget(dir->i_sb->s_root);
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/* Build a new key for the inode item */
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key.objectid = objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
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