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btrfs: make relocation use btrfs_read_tree_root() 

Relocation has it's special roots, we don't want to save these in the
root cache either, so swap it to use btrfs_read_tree_root().  However
the reloc root does need REF_COWS set, so make sure we set it everywhere
we use this helper, as it no longer does the REF_COWS setting.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:22 -05:00 committed by David Sterba
parent 62a2c73ebd
commit 3dbf1738a1
1 changed files with 4 additions and 2 deletions
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6
fs/btrfs/relocation.c
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@ -1494,8 +1494,9 @@ static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans,
BUG_ON(ret);
kfree(root_item);
reloc_root = btrfs_read_fs_root(fs_info->tree_root, &root_key);
reloc_root = btrfs_read_tree_root(fs_info->tree_root, &root_key);
BUG_ON(IS_ERR(reloc_root));
set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state);
reloc_root->last_trans = trans->transid;
return reloc_root;
}
@ -4584,12 +4585,13 @@ int btrfs_recover_relocation(struct btrfs_root *root)
key.type != BTRFS_ROOT_ITEM_KEY)
break;
reloc_root = btrfs_read_fs_root(root, &key);
reloc_root = btrfs_read_tree_root(root, &key);
if (IS_ERR(reloc_root)) {
err = PTR_ERR(reloc_root);
goto out;
}
set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state);
list_add(&reloc_root->root_list, &reloc_roots);
if (btrfs_root_refs(&reloc_root->root_item) > 0) {