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perf(MountManager): use binary search to find mount in path

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Signed-off-by: Carl Schwan <carlschwan@kde.org>
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Carl Schwan 2026-01-29 01:16:03 +01:00
parent c6c11d474b
commit 04ddeeec4a
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GPG key ID: 02325448204E452A
2 changed files with 77 additions and 26 deletions
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85
lib/private/Files/Mount/Manager.php
View file

@ -18,8 +18,11 @@ use OCP\Files\Mount\IMountPoint;
use OCP\Files\NotFoundException;
class Manager implements IMountManager {
/** @var MountPoint[] */
/** @var array<string, IMountPoint> */
private array $mounts = [];
private bool $areMountsSorted = false;
/** @var list<string>|null $mountKeys */
private ?array $mountKeys = null;
/** @var CappedMemoryCache<IMountPoint> */
private CappedMemoryCache $pathCache;
/** @var CappedMemoryCache<IMountPoint[]> */
@ -32,19 +35,14 @@ class Manager implements IMountManager {
$this->setupManager = $setupManagerFactory->create($this);
}
/**
* @param IMountPoint $mount
*/
public function addMount(IMountPoint $mount) {
public function addMount(IMountPoint $mount): void {
$this->mounts[$mount->getMountPoint()] = $mount;
$this->pathCache->clear();
$this->inPathCache->clear();
$this->areMountsSorted = false;
}
/**
* @param string $mountPoint
*/
public function removeMount(string $mountPoint) {
public function removeMount(string $mountPoint): void {
$mountPoint = Filesystem::normalizePath($mountPoint);
if (\strlen($mountPoint) > 1) {
$mountPoint .= '/';
@ -52,24 +50,19 @@ class Manager implements IMountManager {
unset($this->mounts[$mountPoint]);
$this->pathCache->clear();
$this->inPathCache->clear();
$this->areMountsSorted = false;
}
/**
* @param string $mountPoint
* @param string $target
*/
public function moveMount(string $mountPoint, string $target) {
public function moveMount(string $mountPoint, string $target): void {
$this->mounts[$target] = $this->mounts[$mountPoint];
unset($this->mounts[$mountPoint]);
$this->pathCache->clear();
$this->inPathCache->clear();
$this->areMountsSorted = false;
}
/**
* Find the mount for $path
*
* @param string $path
* @return IMountPoint
*/
public function find(string $path): IMountPoint {
$this->setupManager->setupForPath($path);
@ -79,8 +72,6 @@ class Manager implements IMountManager {
return $this->pathCache[$path];
}
if (count($this->mounts) === 0) {
$this->setupManager->setupRoot();
if (count($this->mounts) === 0) {
@ -120,15 +111,57 @@ class Manager implements IMountManager {
return $this->inPathCache[$path];
}
$result = [];
$pathLen = strlen($path);
foreach ($this->mounts as $mountPoint => $mount) {
if (strlen($mountPoint) > $pathLen && str_starts_with($mountPoint, $path)) {
$result[] = $mount;
if (!$this->areMountsSorted) {
ksort($this->mounts, SORT_STRING);
$this->mountKeys = array_keys($this->mounts);
$this->areMountsSorted = true;
}
$result = $this->binarySearch($this->mounts, $this->mountKeys, $path);
$this->inPathCache[$path] = $result;
return $result;
}
/**
* Search for all entries in $sortedArray where $prefix is a prefix but not equal to their key.
*
* @template T
* @param array<string, T> $sortedArray
* @param list<string> $sortedKeys
* @param string $prefix
* @return list<T>
*/
private function binarySearch(array $sortedArray, array $sortedKeys, string $prefix): array {
$low = 0;
$high = count($sortedArray) - 1;
$start = null;
// binary search
while ($low <= $high) {
$mid = ($low + $high) >> 1;
if ($sortedKeys[$mid] < $prefix) {
$low = $mid + 1;
} else {
$start = $mid;
$high = $mid - 1;
}
}
$result = [];
if ($start !== null) {
for ($i = $start, $n = count($sortedKeys); $i < $n; $i++) {
$key = $sortedKeys[$i];
if (!str_starts_with($key, $prefix)) {
break;
}
if ($key !== $prefix) {
$result[] = $sortedArray[$key];
}
}
}
$this->inPathCache[$path] = $result;
return $result;
}
@ -201,7 +234,7 @@ class Manager implements IMountManager {
*
* @param string $path
* @param string[] $mountProviders
* @return MountPoint[]
* @return IMountPoint[]
*/
public function getMountsByMountProvider(string $path, array $mountProviders) {
$this->getSetupManager()->setupForProvider($path, $mountProviders);

18
tests/lib/Files/Mount/ManagerTest.php
View file

@ -54,6 +54,24 @@ class ManagerTest extends \Test\TestCase {
$this->assertEquals([$mount1, $mount3], $this->manager->findByStorageId($id));
}
public function testBinarySearch(): void {
$sortedArray = [
'a' => false,
'aa' => false,
'b' => false,
'bb' => false,
'bba' => true,
'bbb' => true,
'bdc' => false,
];
$sortedKey = array_keys($sortedArray);
$result = $this->invokePrivate($this->manager, 'binarySearch', [$sortedArray, $sortedKey, 'bb']);
$this->assertEquals(2, count($result));
foreach ($result as $entry) {
$this->assertTrue($entry);
}
}
public function testLong(): void {
$storage = new LongId([]);
$mount = new MountPoint($storage, '/foo');