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btrfs-progs: convert: Introduce init_btrfs_v2 function.

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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@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2016-01-29 13:03:28 +08:00 committed by David Sterba
parent e599b1c8d9
commit 931e97c094
1 changed files with 61 additions and 0 deletions
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61
btrfs-convert.c
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@ -2329,6 +2329,67 @@ 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;