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fs: support LOGICAL_INO_V2

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Automatically fall back to LOGICAL_INO if LOGICAL_INO_V2 fails and no
_V2 flags are used.

Add methods to set the flags argument with build portability to older
headers.

Use thread_local storage for the somewhat large buffers used by
LOGICAL_INO_V2 (and other users of BtrfsDataContainer like INO_PATHS).

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-11-01 23:39:54 -04:00
parent c2762740ef
commit 8cbd6fc67a
3 changed files with 140 additions and 23 deletions
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129
lib/fs.cc
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@@ -238,11 +238,13 @@ namespace crucible {
}
void *
BtrfsDataContainer::prepare()
BtrfsDataContainer::prepare(size_t container_size)
{
if (m_data.size() < container_size) {
m_data.resize(container_size);
}
btrfs_data_container *p = reinterpret_cast<btrfs_data_container *>(m_data.data());
size_t min_size = offsetof(btrfs_data_container, val);
size_t container_size = m_data.size();
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);
}
@@ -301,33 +303,123 @@ namespace crucible {
}
BtrfsIoctlLogicalInoArgs::BtrfsIoctlLogicalInoArgs(uint64_t new_logical, size_t new_size) :
m_container(new_size)
m_container_size(new_size)
{
memset_zero<btrfs_ioctl_logical_ino_args>(this);
logical = new_logical;
}
size_t
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::size() const
{
return m_end - m_begin;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::const_iterator
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::cbegin() const
{
return m_begin;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::const_iterator
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::cend() const
{
return m_end;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::iterator
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::begin() const
{
return m_begin;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::iterator
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::end() const
{
return m_end;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::iterator
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::data() const
{
return m_begin;
}
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::operator vector<BtrfsInodeOffsetRoot>() const
{
return vector<BtrfsInodeOffsetRoot>(m_begin, m_end);
}
void
BtrfsIoctlLogicalInoArgs::BtrfsInodeOffsetRootSpan::clear()
{
m_end = m_begin = nullptr;
}
void
BtrfsIoctlLogicalInoArgs::set_flags(uint64_t new_flags)
{
// We are still supporting building with old headers that don't have .flags yet
reserved[3] = new_flags;
}
uint64_t
BtrfsIoctlLogicalInoArgs::get_flags() const
{
// We are still supporting building with old headers that don't have .flags yet
return reserved[3];
}
bool
BtrfsIoctlLogicalInoArgs::do_ioctl_nothrow(int fd)
{
btrfs_ioctl_logical_ino_args *p = static_cast<btrfs_ioctl_logical_ino_args *>(this);
inodes = reinterpret_cast<uint64_t>(m_container.prepare());
size = m_container.get_size();
thread_local BtrfsDataContainer container;
inodes = reinterpret_cast<uint64_t>(container.prepare(m_container_size));
size = container.get_size();
m_iors.clear();
if (ioctl(fd, BTRFS_IOC_LOGICAL_INO, p)) {
return false;
static unsigned long bili_version = 0;
if (get_flags() == 0) {
// Could use either V1 or V2
if (bili_version) {
// We tested both versions and came to a decision
if (ioctl(fd, bili_version, p)) {
return false;
}
} else {
// Try V2
if (ioctl(fd, BTRFS_IOC_LOGICAL_INO_V2, p)) {
// V2 failed, try again with V1
if (ioctl(fd, BTRFS_IOC_LOGICAL_INO, p)) {
// both V1 and V2 failed, doesn't tell us which one to choose
return false;
}
// V1 and V2 both tested with same arguments, V1 OK, and V2 failed
bili_version = BTRFS_IOC_LOGICAL_INO;
} else {
// V2 succeeded, don't use V1 any more
bili_version = BTRFS_IOC_LOGICAL_INO_V2;
}
}
} else {
// Flags/size require a V2 feature, no fallback to V1 possible
if (ioctl(fd, BTRFS_IOC_LOGICAL_INO_V2, p)) {
return false;
}
// V2 succeeded so we don't need to probe any more
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);
m_iors.reserve(bdc->elem_cnt);
for (auto count = bdc->elem_cnt; count > 2; count -= 3) {
m_iors.push_back(*input_iter++);
}
// elem_cnt counts uint64_t, but BtrfsInodeOffsetRoot is 3x uint64_t
THROW_CHECK1(runtime_error, bdc->elem_cnt, bdc->elem_cnt % 3 == 0);
m_iors.m_begin = input_iter;
m_iors.m_end = input_iter + bdc->elem_cnt / 3;
return true;
}
@@ -350,7 +442,7 @@ namespace crucible {
}
BtrfsIoctlInoPathArgs::BtrfsIoctlInoPathArgs(uint64_t inode, size_t new_size) :
m_container(new_size)
m_container_size(new_size)
{
memset_zero<btrfs_ioctl_ino_path_args>(this);
inum = inode;
@@ -360,8 +452,9 @@ namespace crucible {
BtrfsIoctlInoPathArgs::do_ioctl_nothrow(int fd)
{
btrfs_ioctl_ino_path_args *p = static_cast<btrfs_ioctl_ino_path_args *>(this);
fspath = reinterpret_cast<uint64_t>(m_container.prepare());
size = m_container.get_size();
thread_local BtrfsDataContainer container;
fspath = reinterpret_cast<uint64_t>(container.prepare(m_container_size));
size = m_container_size;
m_paths.clear();
@@ -377,8 +470,8 @@ namespace crucible {
for (auto count = bdc->elem_cnt; count > 0; --count) {
const char *path = cp + *up++;
if (static_cast<size_t>(path - cp) > m_container.get_size()) {
THROW_ERROR(out_of_range, "offset " << (path - cp) << " > size " << m_container.get_size() << " in " << __PRETTY_FUNCTION__);
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__);
}
m_paths.push_back(string(path));
}