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Code Packages

btrfs-tree: add a method to get root backref items to BtrfsRootFetcher

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This complements the already existing support for reading the fields of
a root backref.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2025-02-02 22:24:37 -05:00
parent 58ee297cde
commit dd08f6379f
2 changed files with 18 additions and 3 deletions
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1
include/crucible/btrfs-tree.h
View File

@ -198,6 +198,7 @@ namespace crucible {
public:
BtrfsRootFetcher(const Fd &fd);
BtrfsTreeItem root(uint64_t subvol);
BtrfsTreeItem root_backref(uint64_t subvol);
};
/// Fetch data extent items from extent tree, skipping metadata-only block groups

20
lib/btrfs-tree.cc
View File

@ -696,17 +696,31 @@ namespace crucible {
BtrfsTreeObjectFetcher(fd)
{
tree(BTRFS_ROOT_TREE_OBJECTID);
type(BTRFS_ROOT_ITEM_KEY);
scale_size(1);
}
BtrfsTreeItem
BtrfsRootFetcher::root(uint64_t subvol)
BtrfsRootFetcher::root(const uint64_t subvol)
{
const auto my_type = BTRFS_ROOT_ITEM_KEY;
type(my_type);
const auto item = at(subvol);
if (!!item) {
THROW_CHECK2(runtime_error, item.objectid(), subvol, subvol == item.objectid());
THROW_CHECK2(runtime_error, item.type(), BTRFS_ROOT_ITEM_KEY, item.type() == BTRFS_ROOT_ITEM_KEY);
THROW_CHECK2(runtime_error, item.type(), my_type, item.type() == my_type);
}
return item;
}
BtrfsTreeItem
BtrfsRootFetcher::root_backref(const uint64_t subvol)
{
const auto my_type = BTRFS_ROOT_BACKREF_KEY;
type(my_type);
const auto item = at(subvol);
if (!!item) {
THROW_CHECK2(runtime_error, item.objectid(), subvol, subvol == item.objectid());
THROW_CHECK2(runtime_error, item.type(), my_type, item.type() == my_type);
}
return item;
}