Introduce new init_btrfs_v2() function for later newer do_convert().
Since we have good enough chunk allocation, a lot of wired chunk hack
won't ever be used.
We only need to insert data chunks and create needed subvolume.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
btrfs-convert.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+)
diff --git a/btrfs-convert.c b/btrfs-convert.c
index 8956a86..ce6c59b 100644
--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -2302,6 +2302,67 @@ static int make_convert_data_block_groups(struct btrfs_trans_handle *trans,
return ret;
}
+/*
+ * Init the temp btrfs to a operational status.
+ *
+ * It will fix the extent usage accounting(XXX: Do we really need?) and
+ * insert needed data chunks, to ensure all old fs data extents are covered
+ * by DATA chunks, preventing wrong chunks are allocated.
+ *
+ * And also create convert image subvolume and relocation tree.
+ * (XXX: Not need again?)
+ * But the convert image subvolume is *NOT* linked to fs tree yet.
+ */
+static int init_btrfs_v2(struct btrfs_mkfs_config *cfg, struct btrfs_root *root,
+ struct btrfs_convert_context *cctx, int datacsum,
+ int packing, int noxattr)
+{
+ struct btrfs_key location;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ int ret;
+
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+ ret = btrfs_fix_block_accounting(trans, root);
+ if (ret)
+ goto err;
+ ret = make_convert_data_block_groups(trans, fs_info, cfg, cctx);
+ if (ret)
+ goto err;
+ ret = btrfs_make_root_dir(trans, fs_info->tree_root,
+ BTRFS_ROOT_TREE_DIR_OBJECTID);
+ if (ret)
+ goto err;
+ memcpy(&location, &root->root_key, sizeof(location));
+ location.offset = (u64)-1;
+ ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
+ btrfs_super_root_dir(fs_info->super_copy),
+ &location, BTRFS_FT_DIR, 0);
+ if (ret)
+ goto err;
+ ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
+ location.objectid,
+ btrfs_super_root_dir(fs_info->super_copy), 0);
+ if (ret)
+ goto err;
+ btrfs_set_root_dirid(&fs_info->fs_root->root_item,
+ BTRFS_FIRST_FREE_OBJECTID);
+
+ /* subvol for fs image file */
+ ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
+ if (ret < 0)
+ goto err;
+ /* subvol for data relocation tree */
+ ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
+ if (ret < 0)
+ goto err;
+
+ ret = btrfs_commit_transaction(trans, root);
+err:
+ return ret;
+}
+
static int init_btrfs(struct btrfs_root *root)
{
int ret;
--
2.6.2
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