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Assistant: Use fstatat() while building FileProvider path cache

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Using fstatat() allows the kernel to do relative path resolution as
opposed to absolute path resolution, which is significantly faster
and allows us to build the path cache sooner. :^)
This commit is contained in:
Andreas Kling 2021-07-03 18:10:06 +02:00
parent 801f74362e
commit 4fce72a967
1 changed files with 16 additions and 7 deletions
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23
Userland/Applications/Assistant/Providers.cpp
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@ -6,8 +6,10 @@
#include "Providers.h"
#include "FuzzyMatch.h"
#include <AK/LexicalPath.h>
#include <AK/URL.h>
#include <LibCore/DirIterator.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/File.h>
#include <LibCore/StandardPaths.h>
#include <LibDesktop/Launcher.h>
@ -18,6 +20,7 @@
#include <LibJS/Parser.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <errno.h>
#include <fcntl.h>
#include <serenity.h>
#include <spawn.h>
#include <unistd.h>
@ -151,28 +154,34 @@ void FileProvider::build_filesystem_cache()
m_work_queue.enqueue("/");
Threading::BackgroundAction<int>::create([this](auto&) {
String slash = "/";
Core::ElapsedTimer timer;
timer.start();
while (!m_work_queue.is_empty()) {
auto start = m_work_queue.dequeue();
Core::DirIterator di(start, Core::DirIterator::SkipDots);
auto base_directory = m_work_queue.dequeue();
Core::DirIterator di(base_directory, Core::DirIterator::SkipDots);
while (di.has_next()) {
auto path = di.next_full_path();
auto path = di.next_path();
struct stat st = {};
if (lstat(path.characters(), &st) < 0) {
perror("stat");
if (fstatat(di.fd(), path.characters(), &st, AT_SYMLINK_NOFOLLOW) < 0) {
perror("fstatat");
continue;
}
if (S_ISLNK(st.st_mode))
continue;
m_full_path_cache.append(path);
auto full_path = LexicalPath::join(slash, base_directory, path).string();
m_full_path_cache.append(full_path);
if (S_ISDIR(st.st_mode)) {
m_work_queue.enqueue(path);
m_work_queue.enqueue(full_path);
}
}
}
dbgln("Built cache in {} ms", timer.elapsed());
return 0; }, [this](auto) { m_building_cache = false; });
}