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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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29
include/crucible/fs.h
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@ -58,7 +58,7 @@ namespace crucible {
struct BtrfsDataContainer : public btrfs_data_container {
BtrfsDataContainer(size_t size = 64 * 1024);
void *prepare();
void *prepare(size_t size);
size_t get_size() const;
decltype(bytes_left) get_bytes_left() const;
@ -70,12 +70,31 @@ namespace crucible {
};
struct BtrfsIoctlLogicalInoArgs : public btrfs_ioctl_logical_ino_args {
BtrfsIoctlLogicalInoArgs(uint64_t logical, size_t buf_size = 64 * 1024);
BtrfsIoctlLogicalInoArgs(uint64_t logical, size_t buf_size = 16 * 1024 * 1024);
uint64_t get_flags() const;
void set_flags(uint64_t new_flags);
virtual void do_ioctl(int fd);
virtual bool do_ioctl_nothrow(int fd);
BtrfsDataContainer m_container;
vector<BtrfsInodeOffsetRoot> m_iors;
size_t m_container_size;
struct BtrfsInodeOffsetRootSpan {
using iterator = BtrfsInodeOffsetRoot*;
using const_iterator = const BtrfsInodeOffsetRoot*;
size_t size() const;
iterator begin() const;
iterator end() const;
const_iterator cbegin() const;
const_iterator cend() const;
iterator data() const;
void clear();
operator vector<BtrfsInodeOffsetRoot>() const;
private:
iterator m_begin = nullptr;
iterator m_end = nullptr;
friend struct BtrfsIoctlLogicalInoArgs;
} m_iors;
};
ostream & operator<<(ostream &os, const BtrfsIoctlLogicalInoArgs &p);
@ -85,7 +104,7 @@ namespace crucible {
virtual void do_ioctl(int fd);
virtual bool do_ioctl_nothrow(int fd);
BtrfsDataContainer m_container;
size_t m_container_size;
vector<string> m_paths;
};