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fs: get rid of base class btrfs_data_container

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This fixes another build failure of the form:

	error: flexible array member btrfs_... not at end of struct crucible::Btrfs...

Fixes: https://github.com/Zygo/bees/issues/236
Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2022-10-23 14:01:38 -04:00
parent 3654738f56
commit 5040303f50
2 changed files with 23 additions and 22 deletions
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35
lib/fs.cc
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@@ -197,18 +197,15 @@ namespace crucible {
void *
BtrfsDataContainer::prepare(size_t container_size)
{
if (m_data.size() < container_size) {
m_data = ByteVector(container_size);
}
const auto p = m_data.get<btrfs_data_container>();
const size_t min_size = offsetof(btrfs_data_container, val);
if (container_size < min_size) {
THROW_ERROR(out_of_range, "container size " << container_size << " smaller than minimum " << min_size);
}
p->bytes_left = 0;
p->bytes_missing = 0;
p->elem_cnt = 0;
p->elem_missed = 0;
if (m_data.size() < container_size) {
m_data = ByteVector(container_size);
}
const auto p = m_data.get<btrfs_data_container>();
*p = (btrfs_data_container) { };
return p;
}
@@ -221,25 +218,29 @@ namespace crucible {
decltype(btrfs_data_container::bytes_left)
BtrfsDataContainer::get_bytes_left() const
{
return bytes_left;
const auto p = m_data.get<btrfs_data_container>();
return p->bytes_left;
}
decltype(btrfs_data_container::bytes_missing)
BtrfsDataContainer::get_bytes_missing() const
{
return bytes_missing;
const auto p = m_data.get<btrfs_data_container>();
return p->bytes_missing;
}
decltype(btrfs_data_container::elem_cnt)
BtrfsDataContainer::get_elem_cnt() const
{
return elem_cnt;
const auto p = m_data.get<btrfs_data_container>();
return p->elem_cnt;
}
decltype(btrfs_data_container::elem_missed)
BtrfsDataContainer::get_elem_missed() const
{
return elem_missed;
const auto p = m_data.get<btrfs_data_container>();
return p->elem_missed;
}
ostream &
@@ -373,8 +374,8 @@ namespace crucible {
bili_version = BTRFS_IOC_LOGICAL_INO_V2;
}
btrfs_data_container *bdc = reinterpret_cast<btrfs_data_container *>(p->inodes);
BtrfsInodeOffsetRoot *input_iter = reinterpret_cast<BtrfsInodeOffsetRoot *>(bdc->val);
btrfs_data_container *const bdc = reinterpret_cast<btrfs_data_container *>(p->inodes);
BtrfsInodeOffsetRoot *const input_iter = reinterpret_cast<BtrfsInodeOffsetRoot *>(bdc->val);
// elem_cnt counts uint64_t, but BtrfsInodeOffsetRoot is 3x uint64_t
THROW_CHECK1(runtime_error, bdc->elem_cnt, bdc->elem_cnt % 3 == 0);
@@ -423,14 +424,14 @@ namespace crucible {
return false;
}
btrfs_data_container *bdc = reinterpret_cast<btrfs_data_container *>(p->fspath);
btrfs_data_container *const bdc = reinterpret_cast<btrfs_data_container *>(p->fspath);
m_paths.reserve(bdc->elem_cnt);
const uint64_t *up = reinterpret_cast<const uint64_t *>(bdc->val);
const char *cp = reinterpret_cast<const char *>(bdc->val);
const char *const cp = reinterpret_cast<const char *>(bdc->val);
for (auto count = bdc->elem_cnt; count > 0; --count) {
const char *path = cp + *up++;
const char *const path = cp + *up++;
if (static_cast<size_t>(path - cp) > container.get_size()) {
THROW_ERROR(out_of_range, "offset " << (path - cp) << " > size " << container.get_size() << " in " << __PRETTY_FUNCTION__);
}