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fs: convert vector<uint8_t> and Spanner to ByteVector and rewrite TREE_SEARCH_V2 wrapper

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Switch various methods in fs to use ByteVector to cut down on the number
of slow allocations and copies.

Automatically determine the correct size for TREE_SEARCH_V2 buffers
based on the number of items requested, and grow the buffer as needed.
This eliminates the need to cache some objects that were heavy to create.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-10-11 21:41:49 -04:00
parent daf8a2cde1
commit bba6f4f183
2 changed files with 56 additions and 41 deletions
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12
include/crucible/fs.h
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@ -1,9 +1,9 @@
#ifndef CRUCIBLE_FS_H
#define CRUCIBLE_FS_H
#include "crucible/bytevector.h"
#include "crucible/endian.h"
#include "crucible/error.h"
#include "crucible/spanner.h"
// Terribly Linux-specific FS-wrangling functions
@ -63,7 +63,7 @@ namespace crucible {
decltype(elem_cnt) get_elem_cnt() const;
decltype(elem_missed) get_elem_missed() const;
vector<uint8_t> m_data;
ByteVector m_data;
};
struct BtrfsIoctlLogicalInoArgs : public btrfs_ioctl_logical_ino_args {
@ -170,8 +170,8 @@ namespace crucible {
struct BtrfsIoctlSearchHeader : public btrfs_ioctl_search_header {
BtrfsIoctlSearchHeader();
Spanner<const uint8_t> m_data;
size_t set_data(const vector<uint8_t> &v, size_t offset);
ByteVector m_data;
size_t set_data(const ByteVector &v, size_t offset);
bool operator<(const BtrfsIoctlSearchHeader &that) const;
};
@ -185,7 +185,7 @@ namespace crucible {
ostream & operator<<(ostream &os, const BtrfsIoctlSearchHeader &hdr);
struct BtrfsIoctlSearchKey : public btrfs_ioctl_search_key {
BtrfsIoctlSearchKey(size_t buf_size = 4096);
BtrfsIoctlSearchKey(size_t buf_size = 1024);
bool do_ioctl_nothrow(int fd);
void do_ioctl(int fd);
@ -193,9 +193,7 @@ namespace crucible {
void next_min(const BtrfsIoctlSearchHeader& ref);
size_t m_buf_size;
vector<uint8_t> m_ioctl_arg;
set<BtrfsIoctlSearchHeader> m_result;
};
ostream & operator<<(ostream &os, const btrfs_ioctl_search_key &key);