On Tue, 2012-07-10 at 00:52 +0300, Ilya Dryomov wrote:
> mkfs creates those non-raid chunks for a pretty stupid reason, they
> really shouldn't be there if you create a raid10 fs. Balance does the
> right thing and removes them. Fixing this along with another mkfs
> annoyance related to this one is on my TODO list.
Hi Ilya,
I've also studied this bug and found where the problem is, if this will
help you:
In mkfs.c, "make_root_dir" function creates the first system and
metadata chunk:
ret = btrfs_make_block_group(trans, root, bytes_used,
BTRFS_BLOCK_GROUP_SYSTEM,
BTRFS_FIRST_CHUNK_TREE_OBJECTID,
0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
....
ret = btrfs_alloc_chunk(trans,
root->fs_info->extent_root,
&chunk_start, &chunk_size,
BTRFS_BLOCK_GROUP_METADATA |
BTRFS_BLOCK_GROUP_DATA);
BUG_ON(ret);
ret = btrfs_make_block_group(trans, root, 0,
BTRFS_BLOCK_GROUP_METADATA
|
BTRFS_BLOCK_GROUP_DATA,
BTRFS_FIRST_CHUNK_TREE_OBJECTID,
chunk_start, chunk_size);
And these chunks are created again in "create_raid_groups" function.
Both functions, "make_root_dir" and "create_raid_groups" are called from
"main" function.
Andrei
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