Merge pull request #31431 from nextcloud/fs-setup-manager

Unify/cleanup filesystem setup

19 files changed, 569 insertions, 424 deletions

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 6fd3d9207db..86efab3ad52 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -271,6 +271,7 @@ return array(
     'OCP\\Files\\Events\\Node\\BeforeNodeRenamedEvent' => $baseDir . '/lib/public/Files/Events/Node/BeforeNodeRenamedEvent.php',
     'OCP\\Files\\Events\\Node\\BeforeNodeTouchedEvent' => $baseDir . '/lib/public/Files/Events/Node/BeforeNodeTouchedEvent.php',
     'OCP\\Files\\Events\\Node\\BeforeNodeWrittenEvent' => $baseDir . '/lib/public/Files/Events/Node/BeforeNodeWrittenEvent.php',
+    'OCP\\Files\\Events\\Node\\FilesystemTornDownEvent' => $baseDir . '/lib/public/Files/Events/Node/FilesystemTornDownEvent.php',
     'OCP\\Files\\Events\\Node\\NodeCopiedEvent' => $baseDir . '/lib/public/Files/Events/Node/NodeCopiedEvent.php',
     'OCP\\Files\\Events\\Node\\NodeCreatedEvent' => $baseDir . '/lib/public/Files/Events/Node/NodeCreatedEvent.php',
     'OCP\\Files\\Events\\Node\\NodeDeletedEvent' => $baseDir . '/lib/public/Files/Events/Node/NodeDeletedEvent.php',
@@ -1162,6 +1163,8 @@ return array(
     'OC\\Files\\Search\\SearchComparison' => $baseDir . '/lib/private/Files/Search/SearchComparison.php',
     'OC\\Files\\Search\\SearchOrder' => $baseDir . '/lib/private/Files/Search/SearchOrder.php',
     'OC\\Files\\Search\\SearchQuery' => $baseDir . '/lib/private/Files/Search/SearchQuery.php',
+    'OC\\Files\\SetupManager' => $baseDir . '/lib/private/Files/SetupManager.php',
+    'OC\\Files\\SetupManagerFactory' => $baseDir . '/lib/private/Files/SetupManagerFactory.php',
     'OC\\Files\\SimpleFS\\NewSimpleFile' => $baseDir . '/lib/private/Files/SimpleFS/NewSimpleFile.php',
     'OC\\Files\\SimpleFS\\SimpleFile' => $baseDir . '/lib/private/Files/SimpleFS/SimpleFile.php',
     'OC\\Files\\SimpleFS\\SimpleFolder' => $baseDir . '/lib/private/Files/SimpleFS/SimpleFolder.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index c8c0e7df381..ea37771d63c 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -300,6 +300,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\Files\\Events\\Node\\BeforeNodeRenamedEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/BeforeNodeRenamedEvent.php',
         'OCP\\Files\\Events\\Node\\BeforeNodeTouchedEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/BeforeNodeTouchedEvent.php',
         'OCP\\Files\\Events\\Node\\BeforeNodeWrittenEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/BeforeNodeWrittenEvent.php',
+        'OCP\\Files\\Events\\Node\\FilesystemTornDownEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/FilesystemTornDownEvent.php',
         'OCP\\Files\\Events\\Node\\NodeCopiedEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/NodeCopiedEvent.php',
         'OCP\\Files\\Events\\Node\\NodeCreatedEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/NodeCreatedEvent.php',
         'OCP\\Files\\Events\\Node\\NodeDeletedEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Events/Node/NodeDeletedEvent.php',
@@ -1191,6 +1192,8 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Files\\Search\\SearchComparison' => __DIR__ . '/../../..' . '/lib/private/Files/Search/SearchComparison.php',
         'OC\\Files\\Search\\SearchOrder' => __DIR__ . '/../../..' . '/lib/private/Files/Search/SearchOrder.php',
         'OC\\Files\\Search\\SearchQuery' => __DIR__ . '/../../..' . '/lib/private/Files/Search/SearchQuery.php',
+        'OC\\Files\\SetupManager' => __DIR__ . '/../../..' . '/lib/private/Files/SetupManager.php',
+        'OC\\Files\\SetupManagerFactory' => __DIR__ . '/../../..' . '/lib/private/Files/SetupManagerFactory.php',
         'OC\\Files\\SimpleFS\\NewSimpleFile' => __DIR__ . '/../../..' . '/lib/private/Files/SimpleFS/NewSimpleFile.php',
         'OC\\Files\\SimpleFS\\SimpleFile' => __DIR__ . '/../../..' . '/lib/private/Files/SimpleFS/SimpleFile.php',
         'OC\\Files\\SimpleFS\\SimpleFolder' => __DIR__ . '/../../..' . '/lib/private/Files/SimpleFS/SimpleFolder.php',
diff --git a/lib/private/Cache/CappedMemoryCache.php b/lib/private/Cache/CappedMemoryCache.php
index 584a53f0ff2..9260bf1f6b3 100644
--- a/lib/private/Cache/CappedMemoryCache.php
+++ b/lib/private/Cache/CappedMemoryCache.php
@@ -27,30 +27,42 @@ use OCP\ICache;
  * In-memory cache with a capacity limit to keep memory usage in check
  *
  * Uses a simple FIFO expiry mechanism
+ * @template T
  */
 class CappedMemoryCache implements ICache, \ArrayAccess {
 	private $capacity;
+	/** @var T[] */
 	private $cache = [];
 
 	public function __construct($capacity = 512) {
 		$this->capacity = $capacity;
 	}
 
-	public function hasKey($key) {
+	public function hasKey($key): bool {
 		return isset($this->cache[$key]);
 	}
 
+	/**
+	 * @return ?T
+	 */
 	public function get($key) {
-		return isset($this->cache[$key]) ? $this->cache[$key] : null;
+		return $this->cache[$key] ?? null;
 	}
 
-	public function set($key, $value, $ttl = 0) {
+	/**
+	 * @param string $key
+	 * @param T $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl = 0): bool {
 		if (is_null($key)) {
 			$this->cache[] = $value;
 		} else {
 			$this->cache[$key] = $value;
 		}
 		$this->garbageCollect();
+		return true;
 	}
 
 	public function remove($key) {
@@ -68,13 +80,18 @@ class CappedMemoryCache implements ICache, \ArrayAccess {
 	}
 
 	/**
-	 * @return mixed
+	 * @return T
 	 */
 	#[\ReturnTypeWillChange]
 	public function &offsetGet($offset) {
 		return $this->cache[$offset];
 	}
 
+	/**
+	 * @param string $key
+	 * @param T $value
+	 * @return void
+	 */
 	public function offsetSet($offset, $value): void {
 		$this->set($offset, $value);
 	}
@@ -83,6 +100,9 @@ class CappedMemoryCache implements ICache, \ArrayAccess {
 		$this->remove($offset);
 	}
 
+	/**
+	 * @return T[]
+	 */
 	public function getData() {
 		return $this->cache;
 	}
diff --git a/lib/private/Files/Config/CachedMountFileInfo.php b/lib/private/Files/Config/CachedMountFileInfo.php
index 71a6ddb9ea9..11a9a505808 100644
--- a/lib/private/Files/Config/CachedMountFileInfo.php
+++ b/lib/private/Files/Config/CachedMountFileInfo.php
@@ -27,8 +27,7 @@ use OCP\Files\Config\ICachedMountFileInfo;
 use OCP\IUser;
 
 class CachedMountFileInfo extends CachedMountInfo implements ICachedMountFileInfo {
-	/** @var string */
-	private $internalPath;
+	private string $internalPath;
 
 	public function __construct(
 		IUser $user,
diff --git a/lib/private/Files/Config/CachedMountInfo.php b/lib/private/Files/Config/CachedMountInfo.php
index c70dba100a4..43c9fae63ec 100644
--- a/lib/private/Files/Config/CachedMountInfo.php
+++ b/lib/private/Files/Config/CachedMountInfo.php
@@ -28,38 +28,13 @@ use OCP\Files\Node;
 use OCP\IUser;
 
 class CachedMountInfo implements ICachedMountInfo {
-	/**
-	 * @var IUser
-	 */
-	protected $user;
-
-	/**
-	 * @var int
-	 */
-	protected $storageId;
-
-	/**
-	 * @var int
-	 */
-	protected $rootId;
-
-	/**
-	 * @var string
-	 */
-	protected $mountPoint;
-
-	/**
-	 * @var int|null
-	 */
-	protected $mountId;
-
-	/**
-	 * @var string
-	 */
-	protected $rootInternalPath;
-
-	/** @var string */
-	protected $mountProvider;
+	protected IUser $user;
+	protected int $storageId;
+	protected int $rootId;
+	protected string $mountPoint;
+	protected ?int $mountId;
+	protected string $rootInternalPath;
+	protected string $mountProvider;
 
 	/**
 	 * CachedMountInfo constructor.
@@ -95,28 +70,28 @@ class CachedMountInfo implements ICachedMountInfo {
 	/**
 	 * @return IUser
 	 */
-	public function getUser() {
+	public function getUser(): IUser {
 		return $this->user;
 	}
 
 	/**
 	 * @return int the numeric storage id of the mount
 	 */
-	public function getStorageId() {
+	public function getStorageId(): int {
 		return $this->storageId;
 	}
 
 	/**
 	 * @return int the fileid of the root of the mount
 	 */
-	public function getRootId() {
+	public function getRootId(): int {
 		return $this->rootId;
 	}
 
 	/**
-	 * @return Node the root node of the mount
+	 * @return Node|null the root node of the mount
 	 */
-	public function getMountPointNode() {
+	public function getMountPointNode(): ?Node {
 		// TODO injection etc
 		Filesystem::initMountPoints($this->getUser()->getUID());
 		$userNode = \OC::$server->getUserFolder($this->getUser()->getUID());
@@ -131,7 +106,7 @@ class CachedMountInfo implements ICachedMountInfo {
 	/**
 	 * @return string the mount point of the mount for the user
 	 */
-	public function getMountPoint() {
+	public function getMountPoint(): string {
 		return $this->mountPoint;
 	}
 
@@ -141,7 +116,7 @@ class CachedMountInfo implements ICachedMountInfo {
 	 * @return int|null mount id or null if not applicable
 	 * @since 9.1.0
 	 */
-	public function getMountId() {
+	public function getMountId(): ?int {
 		return $this->mountId;
 	}
 
@@ -150,7 +125,7 @@ class CachedMountInfo implements ICachedMountInfo {
 	 *
 	 * @return string
 	 */
-	public function getRootInternalPath() {
+	public function getRootInternalPath(): string {
 		return $this->rootInternalPath;
 	}
 
diff --git a/lib/private/Files/Config/LazyStorageMountInfo.php b/lib/private/Files/Config/LazyStorageMountInfo.php
index fd3bbcbe0fb..78055a2cdb8 100644
--- a/lib/private/Files/Config/LazyStorageMountInfo.php
+++ b/lib/private/Files/Config/LazyStorageMountInfo.php
@@ -25,8 +25,7 @@ use OCP\Files\Mount\IMountPoint;
 use OCP\IUser;
 
 class LazyStorageMountInfo extends CachedMountInfo {
-	/** @var IMountPoint */
-	private $mount;
+	private IMountPoint $mount;
 
 	/**
 	 * CachedMountInfo constructor.
@@ -37,12 +36,15 @@ class LazyStorageMountInfo extends CachedMountInfo {
 	public function __construct(IUser $user, IMountPoint $mount) {
 		$this->user = $user;
 		$this->mount = $mount;
+		$this->rootId = 0;
+		$this->storageId = 0;
+		$this->mountPoint = '';
 	}
 
 	/**
 	 * @return int the numeric storage id of the mount
 	 */
-	public function getStorageId() {
+	public function getStorageId(): int {
 		if (!$this->storageId) {
 			$this->storageId = $this->mount->getNumericStorageId();
 		}
@@ -52,7 +54,7 @@ class LazyStorageMountInfo extends CachedMountInfo {
 	/**
 	 * @return int the fileid of the root of the mount
 	 */
-	public function getRootId() {
+	public function getRootId(): int {
 		if (!$this->rootId) {
 			$this->rootId = $this->mount->getStorageRootId();
 		}
@@ -62,14 +64,14 @@ class LazyStorageMountInfo extends CachedMountInfo {
 	/**
 	 * @return string the mount point of the mount for the user
 	 */
-	public function getMountPoint() {
+	public function getMountPoint(): string {
 		if (!$this->mountPoint) {
 			$this->mountPoint = $this->mount->getMountPoint();
 		}
 		return parent::getMountPoint();
 	}
 
-	public function getMountId() {
+	public function getMountId(): ?int {
 		return $this->mount->getMountId();
 	}
 
@@ -78,7 +80,7 @@ class LazyStorageMountInfo extends CachedMountInfo {
 	 *
 	 * @return string
 	 */
-	public function getRootInternalPath() {
+	public function getRootInternalPath(): string {
 		return $this->mount->getInternalPath($this->mount->getMountPoint());
 	}
 
diff --git a/lib/private/Files/Config/MountProviderCollection.php b/lib/private/Files/Config/MountProviderCollection.php
index ba70e29ab8d..cd8a2a2e29f 100644
--- a/lib/private/Files/Config/MountProviderCollection.php
+++ b/lib/private/Files/Config/MountProviderCollection.php
@@ -184,16 +184,6 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 	}
 
 	/**
-	 * Cache mounts for user
-	 *
-	 * @param IUser $user
-	 * @param IMountPoint[] $mountPoints
-	 */
-	public function registerMounts(IUser $user, array $mountPoints) {
-		$this->mountCache->registerMounts($user, $mountPoints);
-	}
-
-	/**
 	 * Get the mount cache which can be used to search for mounts without setting up the filesystem
 	 *
 	 * @return IUserMountCache
@@ -222,4 +212,10 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 		}, []);
 		return $mounts;
 	}
+
+	public function clearProviders() {
+		$this->providers = [];
+		$this->homeProviders = [];
+		$this->rootProviders = [];
+	}
 }
diff --git a/lib/private/Files/Filesystem.php b/lib/private/Files/Filesystem.php
index e439b746bf6..1aedad93aa1 100644
--- a/lib/private/Files/Filesystem.php
+++ b/lib/private/Files/Filesystem.php
@@ -38,13 +38,12 @@
 namespace OC\Files;
 
 use OC\Cache\CappedMemoryCache;
-use OC\Files\Config\MountProviderCollection;
 use OC\Files\Mount\MountPoint;
-use OC\Lockdown\Filesystem\NullStorage;
-use OCP\Files\Config\IMountProvider;
+use OC\User\NoUserException;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Events\Node\FilesystemTornDownEvent;
 use OCP\Files\NotFoundException;
 use OCP\Files\Storage\IStorageFactory;
-use OCP\ILogger;
 use OCP\IUser;
 use OCP\IUserManager;
 
@@ -259,11 +258,7 @@ class Filesystem {
 			\OC_Util::setupFS();
 		}
 		$mount = self::$mounts->find($path);
-		if ($mount) {
-			return $mount->getMountPoint();
-		} else {
-			return '';
-		}
+		return $mount->getMountPoint();
 	}
 
 	/**
@@ -319,11 +314,7 @@ class Filesystem {
 	 */
 	public static function resolvePath($path) {
 		$mount = self::getMountManager()->find($path);
-		if ($mount) {
-			return [$mount->getStorage(), rtrim($mount->getInternalPath($path), '/')];
-		} else {
-			return [null, null];
-		}
+		return [$mount->getStorage(), rtrim($mount->getInternalPath($path), '/')];
 	}
 
 	public static function init($user, $root) {
@@ -332,6 +323,13 @@ class Filesystem {
 		}
 		self::getLoader();
 		self::$defaultInstance = new View($root);
+		/** @var IEventDispatcher $eventDispatcher */
+		$eventDispatcher = \OC::$server->get(IEventDispatcher::class);
+		$eventDispatcher->addListener(FilesystemTornDownEvent::class, function () {
+			self::$defaultInstance = null;
+			self::$usersSetup = [];
+			self::$loaded = false;
+		});
 
 		if (!self::$mounts) {
 			self::$mounts = \OC::$server->getMountManager();
@@ -358,106 +356,16 @@ class Filesystem {
 	 * @throws \OC\User\NoUserException if the user is not available
 	 */
 	public static function initMountPoints($user = '') {
-		$userManager = \OC::$server->getUserManager();
-		if (is_string($user)) {
-			if ($user === '') {
-				$user = \OC_User::getUser();
-			}
-
-			$userObject = $userManager->get($user);
-		} elseif ($user instanceof IUser) {
-			$userObject = $user;
-			$user = $userObject->getUID();
-		} else {
-			$userObject = null;
-		}
-
-		if ($userObject === null || $user === false || $user === '') {
-			throw new \OC\User\NoUserException('Attempted to initialize mount points for null user and no user in session');
-		}
-
-		if (isset(self::$usersSetup[$user])) {
-			return;
-		}
-
-		self::$usersSetup[$user] = true;
-
-		if (is_null($userObject)) {
-			\OCP\Util::writeLog('files', ' Backends provided no user object for ' . $user, ILogger::ERROR);
-			// reset flag, this will make it possible to rethrow the exception if called again
-			unset(self::$usersSetup[$user]);
-			throw new \OC\User\NoUserException('Backends provided no user object for ' . $user);
-		}
-
-		$realUid = $userObject->getUID();
-		// workaround in case of different casings
-		if ($user !== $realUid) {
-			$stack = json_encode(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 50));
-			\OCP\Util::writeLog('files', 'initMountPoints() called with wrong user casing. This could be a bug. Expected: "' . $realUid . '" got "' . $user . '". Stack: ' . $stack, ILogger::WARN);
-			$user = $realUid;
-
-			// again with the correct casing
-			if (isset(self::$usersSetup[$user])) {
-				return;
-			}
-
-			self::$usersSetup[$user] = true;
-		}
-
-		if (\OC::$server->getLockdownManager()->canAccessFilesystem()) {
-			/** @var \OC\Files\Config\MountProviderCollection $mountConfigManager */
-			$mountConfigManager = \OC::$server->getMountProviderCollection();
-
-			// home mounts are handled seperate since we need to ensure this is mounted before we call the other mount providers
-			$homeMount = $mountConfigManager->getHomeMountForUser($userObject);
-			self::getMountManager()->addMount($homeMount);
-
-			if ($homeMount->getStorageRootId() === -1) {
-				$homeMount->getStorage()->mkdir('');
-				$homeMount->getStorage()->getScanner()->scan('');
-			}
-
-			\OC\Files\Filesystem::getStorage($user);
-
-			// Chance to mount for other storages
-			if ($userObject) {
-				$mounts = $mountConfigManager->addMountForUser($userObject, self::getMountManager());
-				$mounts[] = $homeMount;
-				$mountConfigManager->registerMounts($userObject, $mounts);
-			}
-
-			self::listenForNewMountProviders($mountConfigManager, $userManager);
+		/** @var IUserManager $userManager */
+		$userManager = \OC::$server->get(IUserManager::class);
+
+		$userObject = ($user instanceof IUser) ? $user : $userManager->get($user);
+		if ($userObject) {
+			/** @var SetupManager $setupManager */
+			$setupManager = \OC::$server->get(SetupManager::class);
+			$setupManager->setupForUser($userObject);
 		} else {
-			self::getMountManager()->addMount(new MountPoint(
-				new NullStorage([]),
-				'/' . $user
-			));
-			self::getMountManager()->addMount(new MountPoint(
-				new NullStorage([]),
-				'/' . $user . '/files'
-			));
-		}
-		\OC_Hook::emit('OC_Filesystem', 'post_initMountPoints', ['user' => $user]);
-	}
-
-	/**
-	 * Get mounts from mount providers that are registered after setup
-	 *
-	 * @param MountProviderCollection $mountConfigManager
-	 * @param IUserManager $userManager
-	 */
-	private static function listenForNewMountProviders(MountProviderCollection $mountConfigManager, IUserManager $userManager) {
-		if (!self::$listeningForProviders) {
-			self::$listeningForProviders = true;
-			$mountConfigManager->listen('\OC\Files\Config', 'registerMountProvider', function (IMountProvider $provider) use ($userManager) {
-				foreach (Filesystem::$usersSetup as $user => $setup) {
-					$userObject = $userManager->get($user);
-					if ($userObject) {
-						$mounts = $provider->getMountsForUser($userObject, Filesystem::getLoader());
-						array_walk($mounts, [self::$mounts, 'addMount']);
-					}
-				}
-			});
+			throw new NoUserException();
 		}
 	}
 
@@ -474,8 +382,7 @@ class Filesystem {
 	 * tear down the filesystem, removing all storage providers
 	 */
 	public static function tearDown() {
-		self::clearMounts();
-		self::$defaultInstance = null;
+		\OC_Util::tearDownFS();
 	}
 
 	/**
@@ -493,16 +400,6 @@ class Filesystem {
 	}
 
 	/**
-	 * clear all mounts and storage backends
-	 */
-	public static function clearMounts() {
-		if (self::$mounts) {
-			self::$usersSetup = [];
-			self::$mounts->clear();
-		}
-	}
-
-	/**
 	 * mount an \OC\Files\Storage\Storage in our virtual filesystem
 	 *
 	 * @param \OC\Files\Storage\Storage|string $class
diff --git a/lib/private/Files/Mount/Manager.php b/lib/private/Files/Mount/Manager.php
index 22b05b1f384..66832690363 100644
--- a/lib/private/Files/Mount/Manager.php
+++ b/lib/private/Files/Mount/Manager.php
@@ -26,26 +26,30 @@ declare(strict_types=1);
  * along with this program. If not, see <http://www.gnu.org/licenses/>
  *
  */
+
 namespace OC\Files\Mount;
 
 use OC\Cache\CappedMemoryCache;
 use OC\Files\Filesystem;
+use OC\Files\SetupManager;
+use OC\Files\SetupManagerFactory;
 use OCP\Files\Mount\IMountManager;
 use OCP\Files\Mount\IMountPoint;
+use OCP\Files\NotFoundException;
 
 class Manager implements IMountManager {
 	/** @var MountPoint[] */
-	private $mounts = [];
-
-	/** @var CappedMemoryCache */
-	private $pathCache;
-
-	/** @var CappedMemoryCache */
-	private $inPathCache;
-
-	public function __construct() {
+	private array $mounts = [];
+	/** @var CappedMemoryCache<IMountPoint> */
+	private CappedMemoryCache $pathCache;
+	/** @var CappedMemoryCache<IMountPoint[]> */
+	private CappedMemoryCache $inPathCache;
+	private SetupManager $setupManager;
+
+	public function __construct(SetupManagerFactory $setupManagerFactory) {
 		$this->pathCache = new CappedMemoryCache();
 		$this->inPathCache = new CappedMemoryCache();
+		$this->setupManager = $setupManagerFactory->create($this);
 	}
 
 	/**
@@ -81,26 +85,14 @@ class Manager implements IMountManager {
 		$this->inPathCache->clear();
 	}
 
-	private function setupForFind(string $path) {
-		if (strpos($path, '/appdata_' . \OC_Util::getInstanceId()) === 0) {
-			// for appdata, we only setup the root bits, not the user bits
-			\OC_Util::setupRootFS();
-		} elseif (strpos($path, '/files_external/uploads/') === 0) {
-			// for OC\Security\CertificateManager, we only setup the root bits, not the user bits
-			\OC_Util::setupRootFS();
-		} else {
-			\OC_Util::setupFS();
-		}
-	}
-
 	/**
 	 * Find the mount for $path
 	 *
 	 * @param string $path
-	 * @return MountPoint|null
+	 * @return IMountPoint
 	 */
-	public function find(string $path) {
-		$this->setupForFind($path);
+	public function find(string $path): IMountPoint {
+		$this->setupManager->setupForPath($path);
 		$path = Filesystem::normalizePath($path);
 
 		if (isset($this->pathCache[$path])) {
@@ -113,10 +105,8 @@ class Manager implements IMountManager {
 			if (isset($this->mounts[$mountPoint])) {
 				$this->pathCache[$path] = $this->mounts[$mountPoint];
 				return $this->mounts[$mountPoint];
-			}
-
-			if ($current === '') {
-				return null;
+			} elseif ($current === '') {
+				break;
 			}
 
 			$current = dirname($current);
@@ -124,16 +114,18 @@ class Manager implements IMountManager {
 				$current = '';
 			}
 		}
+
+		throw new NotFoundException("No mount for path " . $path . " existing mounts: " . implode(",", array_keys($this->mounts)));
 	}
 
 	/**
 	 * Find all mounts in $path
 	 *
 	 * @param string $path
-	 * @return MountPoint[]
+	 * @return IMountPoint[]
 	 */
 	public function findIn(string $path): array {
-		$this->setupForFind($path);
+		$this->setupManager->setupForPath($path);
 		$path = $this->formatPath($path);
 
 		if (isset($this->inPathCache[$path])) {
@@ -163,7 +155,7 @@ class Manager implements IMountManager {
 	 * Find mounts by storage id
 	 *
 	 * @param string $id
-	 * @return MountPoint[]
+	 * @return IMountPoint[]
 	 */
 	public function findByStorageId(string $id): array {
 		\OC_Util::setupFS();
@@ -180,7 +172,7 @@ class Manager implements IMountManager {
 	}
 
 	/**
-	 * @return MountPoint[]
+	 * @return IMountPoint[]
 	 */
 	public function getAll(): array {
 		return $this->mounts;
@@ -190,7 +182,7 @@ class Manager implements IMountManager {
 	 * Find mounts by numeric storage id
 	 *
 	 * @param int $id
-	 * @return MountPoint[]
+	 * @return IMountPoint[]
 	 */
 	public function findByNumericId(int $id): array {
 		$storageId = \OC\Files\Cache\Storage::getStorageId($id);
@@ -208,4 +200,8 @@ class Manager implements IMountManager {
 		}
 		return $path;
 	}
+
+	public function getSetupManager(): SetupManager {
+		return $this->setupManager;
+	}
 }
diff --git a/lib/private/Files/Node/Root.php b/lib/private/Files/Node/Root.php
index b5707c87543..88ac4a31d34 100644
--- a/lib/private/Files/Node/Root.php
+++ b/lib/private/Files/Node/Root.php
@@ -35,13 +35,17 @@ namespace OC\Files\Node;
 use OC\Cache\CappedMemoryCache;
 use OC\Files\Mount\Manager;
 use OC\Files\Mount\MountPoint;
+use OC\Files\View;
 use OC\Hooks\PublicEmitter;
 use OC\User\NoUserException;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\IUserMountCache;
+use OCP\Files\Events\Node\FilesystemTornDownEvent;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
 use OCP\Files\NotPermittedException;
 use OCP\ILogger;
+use OCP\IUser;
 use OCP\IUserManager;
 
 /**
@@ -64,35 +68,32 @@ use OCP\IUserManager;
  * @package OC\Files\Node
  */
 class Root extends Folder implements IRootFolder {
-	/** @var Manager */
-	private $mountManager;
-	/** @var PublicEmitter */
-	private $emitter;
-	/** @var null|\OC\User\User */
-	private $user;
-	/** @var CappedMemoryCache */
-	private $userFolderCache;
-	/** @var IUserMountCache */
-	private $userMountCache;
-	/** @var ILogger */
-	private $logger;
-	/** @var IUserManager */
-	private $userManager;
+	private Manager $mountManager;
+	private PublicEmitter $emitter;
+	private ?IUser $user;
+	private CappedMemoryCache $userFolderCache;
+	private IUserMountCache $userMountCache;
+	private ILogger $logger;
+	private IUserManager $userManager;
+	private IEventDispatcher $eventDispatcher;
 
 	/**
-	 * @param \OC\Files\Mount\Manager $manager
-	 * @param \OC\Files\View $view
-	 * @param \OC\User\User|null $user
+	 * @param Manager $manager
+	 * @param View $view
+	 * @param IUser|null $user
 	 * @param IUserMountCache $userMountCache
 	 * @param ILogger $logger
 	 * @param IUserManager $userManager
 	 */
-	public function __construct($manager,
+	public function __construct(
+		$manager,
 		$view,
 		$user,
-								IUserMountCache $userMountCache,
-								ILogger $logger,
-								IUserManager $userManager) {
+		IUserMountCache $userMountCache,
+		ILogger $logger,
+		IUserManager $userManager,
+		IEventDispatcher $eventDispatcher
+	) {
 		parent::__construct($this, $view, '');
 		$this->mountManager = $manager;
 		$this->user = $user;
@@ -101,6 +102,9 @@ class Root extends Folder implements IRootFolder {
 		$this->userMountCache = $userMountCache;
 		$this->logger = $logger;
 		$this->userManager = $userManager;
+		$eventDispatcher->addListener(FilesystemTornDownEvent::class, function () {
+			$this->userFolderCache = new CappedMemoryCache();
+		});
 	}
 
 	/**
@@ -267,21 +271,21 @@ class Root extends Folder implements IRootFolder {
 	 * @return int
 	 */
 	public function getId() {
-		return null;
+		return 0;
 	}
 
 	/**
 	 * @return array
 	 */
 	public function stat() {
-		return null;
+		return [];
 	}
 
 	/**
 	 * @return int
 	 */
 	public function getMTime() {
-		return null;
+		return 0;
 	}
 
 	/**
@@ -289,14 +293,14 @@ class Root extends Folder implements IRootFolder {
 	 * @return int
 	 */
 	public function getSize($includeMounts = true) {
-		return null;
+		return 0;
 	}
 
 	/**
 	 * @return string
 	 */
 	public function getEtag() {
-		return null;
+		return '';
 	}
 
 	/**
@@ -393,10 +397,6 @@ class Root extends Folder implements IRootFolder {
 		return $this->userFolderCache->get($userId);
 	}
 
-	public function clearCache() {
-		$this->userFolderCache = new CappedMemoryCache();
-	}
-
 	public function getUserMountCache() {
 		return $this->userMountCache;
 	}
diff --git a/lib/private/Files/SetupManager.php b/lib/private/Files/SetupManager.php
new file mode 100644
index 00000000000..f9276ef4171
--- /dev/null
+++ b/lib/private/Files/SetupManager.php
@@ -0,0 +1,283 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Files;
+
+use OC\Files\Config\MountProviderCollection;
+use OC\Files\Mount\MountPoint;
+use OC\Files\ObjectStore\HomeObjectStoreStorage;
+use OC\Files\Storage\Common;
+use OC\Files\Storage\Home;
+use OC\Files\Storage\Storage;
+use OC\Files\Storage\Wrapper\Availability;
+use OC\Files\Storage\Wrapper\Encoding;
+use OC\Files\Storage\Wrapper\PermissionsMask;
+use OC\Files\Storage\Wrapper\Quota;
+use OC\Lockdown\Filesystem\NullStorage;
+use OC_App;
+use OC_Hook;
+use OC_Util;
+use OCP\Constants;
+use OCP\Diagnostics\IEventLogger;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Config\IMountProvider;
+use OCP\Files\Config\IUserMountCache;
+use OCP\Files\Events\Node\FilesystemTornDownEvent;
+use OCP\Files\Mount\IMountManager;
+use OCP\Files\Mount\IMountPoint;
+use OCP\Files\Storage\IStorage;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\Lockdown\ILockdownManager;
+
+class SetupManager {
+	private bool $rootSetup = false;
+	private IEventLogger $eventLogger;
+	private MountProviderCollection $mountProviderCollection;
+	private IMountManager $mountManager;
+	private IUserManager $userManager;
+	private array $setupUsers = [];
+	private IEventDispatcher $eventDispatcher;
+	private IUserMountCache $userMountCache;
+	private ILockdownManager $lockdownManager;
+	private bool $listeningForProviders;
+
+	public function __construct(
+		IEventLogger $eventLogger,
+		MountProviderCollection $mountProviderCollection,
+		IMountManager $mountManager,
+		IUserManager $userManager,
+		IEventDispatcher $eventDispatcher,
+		IUserMountCache $userMountCache,
+		ILockdownManager $lockdownManager
+	) {
+		$this->eventLogger = $eventLogger;
+		$this->mountProviderCollection = $mountProviderCollection;
+		$this->mountManager = $mountManager;
+		$this->userManager = $userManager;
+		$this->eventDispatcher = $eventDispatcher;
+		$this->userMountCache = $userMountCache;
+		$this->lockdownManager = $lockdownManager;
+		$this->listeningForProviders = false;
+	}
+
+	private function setupBuiltinWrappers() {
+		Filesystem::addStorageWrapper('mount_options', function ($mountPoint, IStorage $storage, IMountPoint $mount) {
+			if ($storage->instanceOfStorage(Common::class)) {
+				$storage->setMountOptions($mount->getOptions());
+			}
+			return $storage;
+		});
+
+		Filesystem::addStorageWrapper('enable_sharing', function ($mountPoint, IStorage $storage, IMountPoint $mount) {
+			if (!$mount->getOption('enable_sharing', true)) {
+				return new PermissionsMask([
+					'storage' => $storage,
+					'mask' => Constants::PERMISSION_ALL - Constants::PERMISSION_SHARE,
+				]);
+			}
+			return $storage;
+		});
+
+		// install storage availability wrapper, before most other wrappers
+		Filesystem::addStorageWrapper('oc_availability', function ($mountPoint, IStorage $storage) {
+			if (!$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
+				return new Availability(['storage' => $storage]);
+			}
+			return $storage;
+		});
+
+		Filesystem::addStorageWrapper('oc_encoding', function ($mountPoint, IStorage $storage, IMountPoint $mount) {
+			if ($mount->getOption('encoding_compatibility', false) && !$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
+				return new Encoding(['storage' => $storage]);
+			}
+			return $storage;
+		});
+
+		Filesystem::addStorageWrapper('oc_quota', function ($mountPoint, $storage) {
+			// set up quota for home storages, even for other users
+			// which can happen when using sharing
+
+			/**
+			 * @var Storage $storage
+			 */
+			if ($storage->instanceOfStorage(HomeObjectStoreStorage::class) || $storage->instanceOfStorage(Home::class)) {
+				if (is_object($storage->getUser())) {
+					$quota = OC_Util::getUserQuota($storage->getUser());
+					if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
+						return new Quota(['storage' => $storage, 'quota' => $quota, 'root' => 'files']);
+					}
+				}
+			}
+
+			return $storage;
+		});
+
+		Filesystem::addStorageWrapper('readonly', function ($mountPoint, IStorage $storage, IMountPoint $mount) {
+			/*
+			 * Do not allow any operations that modify the storage
+			 */
+			if ($mount->getOption('readonly', false)) {
+				return new PermissionsMask([
+					'storage' => $storage,
+					'mask' => Constants::PERMISSION_ALL & ~(
+							Constants::PERMISSION_UPDATE |
+							Constants::PERMISSION_CREATE |
+							Constants::PERMISSION_DELETE
+						),
+				]);
+			}
+			return $storage;
+		});
+	}
+
+	/**
+	 * Setup the full filesystem for the specified user
+	 */
+	public function setupForUser(IUser $user): void {
+		$this->setupRoot();
+
+		if (in_array($user->getUID(), $this->setupUsers, true)) {
+			return;
+		}
+		$this->setupUsers[] = $user->getUID();
+
+		$this->eventLogger->start('setup_fs', 'Setup filesystem');
+
+		$prevLogging = Filesystem::logWarningWhenAddingStorageWrapper(false);
+
+		OC_Hook::emit('OC_Filesystem', 'preSetup', ['user' => $user->getUID()]);
+
+		Filesystem::logWarningWhenAddingStorageWrapper($prevLogging);
+
+		$userDir = '/' . $user->getUID() . '/files';
+
+		Filesystem::init($user, $userDir);
+
+		if ($this->lockdownManager->canAccessFilesystem()) {
+			// home mounts are handled separate since we need to ensure this is mounted before we call the other mount providers
+			$homeMount = $this->mountProviderCollection->getHomeMountForUser($user);
+			$this->mountManager->addMount($homeMount);
+
+			if ($homeMount->getStorageRootId() === -1) {
+				$homeMount->getStorage()->mkdir('');
+				$homeMount->getStorage()->getScanner()->scan('');
+			}
+
+			// Chance to mount for other storages
+			$mounts = $this->mountProviderCollection->addMountForUser($user, $this->mountManager);
+			$mounts[] = $homeMount;
+			$this->userMountCache->registerMounts($user, $mounts);
+
+			$this->listenForNewMountProviders();
+		} else {
+			$this->mountManager->addMount(new MountPoint(
+				new NullStorage([]),
+				'/' . $user->getUID()
+			));
+			$this->mountManager->addMount(new MountPoint(
+				new NullStorage([]),
+				'/' . $user->getUID() . '/files'
+			));
+		}
+		\OC_Hook::emit('OC_Filesystem', 'post_initMountPoints', ['user' => $user->getUID()]);
+
+		OC_Hook::emit('OC_Filesystem', 'setup', ['user' => $user->getUID(), 'user_dir' => $userDir]);
+
+		$this->eventLogger->end('setup_fs');
+	}
+
+	/**
+	 * Set up the root filesystem
+	 */
+	public function setupRoot(): void {
+		//setting up the filesystem twice can only lead to trouble
+		if ($this->rootSetup) {
+			return;
+		}
+		$this->rootSetup = true;
+
+		$this->eventLogger->start('setup_root_fs', 'Setup root filesystem');
+
+		// load all filesystem apps before, so no setup-hook gets lost
+		OC_App::loadApps(['filesystem']);
+		$prevLogging = Filesystem::logWarningWhenAddingStorageWrapper(false);
+
+		$this->setupBuiltinWrappers();
+
+		Filesystem::logWarningWhenAddingStorageWrapper($prevLogging);
+
+		$rootMounts = $this->mountProviderCollection->getRootMounts();
+		foreach ($rootMounts as $rootMountProvider) {
+			$this->mountManager->addMount($rootMountProvider);
+		}
+
+		$this->eventLogger->end('setup_root_fs');
+	}
+
+	/**
+	 * Set up the filesystem for the specified path
+	 */
+	public function setupForPath(string $path): void {
+		if (substr_count($path, '/') < 2 || strpos($path, '/appdata_' . \OC_Util::getInstanceId()) === 0 || strpos($path, '/files_external/') === 0) {
+			$this->setupRoot();
+			return;
+		} else {
+			[, $userId] = explode('/', $path);
+		}
+
+		$user = $this->userManager->get($userId);
+
+		if (!$user) {
+			$this->setupRoot();
+			return;
+		}
+
+		$this->setupForUser($user);
+	}
+
+	public function tearDown() {
+		$this->setupUsers = [];
+		$this->rootSetup = false;
+		$this->mountManager->clear();
+		$this->eventDispatcher->dispatchTyped(new FilesystemTornDownEvent());
+	}
+
+	/**
+	 * Get mounts from mount providers that are registered after setup
+	 */
+	private function listenForNewMountProviders() {
+		if (!$this->listeningForProviders) {
+			$this->listeningForProviders = true;
+			$this->mountProviderCollection->listen('\OC\Files\Config', 'registerMountProvider', function (IMountProvider $provider) {
+				foreach ($this->setupUsers as $userId) {
+					$user = $this->userManager->get($userId);
+					if ($user) {
+						$mounts = $provider->getMountsForUser($user, Filesystem::getLoader());
+						array_walk($mounts, [$this->mountManager, 'addMount']);
+					}
+				}
+			});
+		}
+	}
+}
diff --git a/lib/private/Files/SetupManagerFactory.php b/lib/private/Files/SetupManagerFactory.php
new file mode 100644
index 00000000000..5dd1601570d
--- /dev/null
+++ b/lib/private/Files/SetupManagerFactory.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Files;
+
+use OCP\Diagnostics\IEventLogger;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Config\IMountProviderCollection;
+use OCP\Files\Config\IUserMountCache;
+use OCP\Files\Mount\IMountManager;
+use OCP\IUserManager;
+use OCP\Lockdown\ILockdownManager;
+
+class SetupManagerFactory {
+	private IEventLogger $eventLogger;
+	private IMountProviderCollection $mountProviderCollection;
+	private IUserManager $userManager;
+	private IEventDispatcher $eventDispatcher;
+	private IUserMountCache $userMountCache;
+	private ILockdownManager $lockdownManager;
+	private ?SetupManager $setupManager;
+
+	public function __construct(
+		IEventLogger $eventLogger,
+		IMountProviderCollection $mountProviderCollection,
+		IUserManager $userManager,
+		IEventDispatcher $eventDispatcher,
+		IUserMountCache $userMountCache,
+		ILockdownManager $lockdownManager
+	) {
+		$this->eventLogger = $eventLogger;
+		$this->mountProviderCollection = $mountProviderCollection;
+		$this->userManager = $userManager;
+		$this->eventDispatcher = $eventDispatcher;
+		$this->userMountCache = $userMountCache;
+		$this->lockdownManager = $lockdownManager;
+		$this->setupManager = null;
+	}
+
+	public function create(IMountManager $mountManager): SetupManager {
+		if (!$this->setupManager) {
+			$this->setupManager = new SetupManager($this->eventLogger, $this->mountProviderCollection, $mountManager, $this->userManager, $this->eventDispatcher, $this->userMountCache, $this->lockdownManager);
+		}
+		return $this->setupManager;
+	}
+}
diff --git a/lib/private/Files/View.php b/lib/private/Files/View.php
index 3cdc6166840..779e0611591 100644
--- a/lib/private/Files/View.php
+++ b/lib/private/Files/View.php
@@ -274,7 +274,7 @@ class View {
 	/**
 	 * remove mount point
 	 *
-	 * @param \OC\Files\Mount\MoveableMount $mount
+	 * @param IMountPoint $mount
 	 * @param string $path relative to data/
 	 * @return boolean
 	 */
@@ -719,7 +719,7 @@ class View {
 		$postFix = (substr($path, -1) === '/') ? '/' : '';
 		$absolutePath = Filesystem::normalizePath($this->getAbsolutePath($path));
 		$mount = Filesystem::getMountManager()->find($absolutePath . $postFix);
-		if ($mount and $mount->getInternalPath($absolutePath) === '') {
+		if ($mount->getInternalPath($absolutePath) === '') {
 			return $this->removeMount($mount, $absolutePath);
 		}
 		if ($this->is_dir($path)) {
@@ -1383,10 +1383,6 @@ class View {
 		$path = Filesystem::normalizePath($this->fakeRoot . '/' . $path);
 
 		$mount = Filesystem::getMountManager()->find($path);
-		if (!$mount) {
-			\OC::$server->getLogger()->warning('Mountpoint not found for path: ' . $path);
-			return false;
-		}
 		$storage = $mount->getStorage();
 		$internalPath = $mount->getInternalPath($path);
 		if ($storage) {
@@ -1488,7 +1484,7 @@ class View {
 
 					$rootEntry = $subCache->get('');
 					if (!$rootEntry) {
-						$subScanner = $subStorage->getScanner('');
+						$subScanner = $subStorage->getScanner();
 						try {
 							$subScanner->scanFile('');
 						} catch (\OCP\Files\StorageNotAvailableException $e) {
@@ -1739,12 +1735,13 @@ class View {
 		$manager = Filesystem::getMountManager();
 		$mounts = $manager->findIn($this->fakeRoot);
 		$mounts[] = $manager->find($this->fakeRoot);
-		// reverse the array so we start with the storage this view is in
+		$mounts = array_filter($mounts);
+		// reverse the array, so we start with the storage this view is in
 		// which is the most likely to contain the file we're looking for
 		$mounts = array_reverse($mounts);
 
-		// put non shared mounts in front of the shared mount
-		// this prevent unneeded recursion into shares
+		// put non-shared mounts in front of the shared mount
+		// this prevents unneeded recursion into shares
 		usort($mounts, function (IMountPoint $a, IMountPoint $b) {
 			return $a instanceof SharedMount && (!$b instanceof SharedMount) ? 1 : -1;
 		});
@@ -1915,14 +1912,10 @@ class View {
 	 * @param string $absolutePath absolute path
 	 * @param bool $useParentMount true to return parent mount instead of whatever
 	 * is mounted directly on the given path, false otherwise
-	 * @return \OC\Files\Mount\MountPoint mount point for which to apply locks
+	 * @return IMountPoint mount point for which to apply locks
 	 */
 	private function getMountForLock($absolutePath, $useParentMount = false) {
-		$results = [];
 		$mount = Filesystem::getMountManager()->find($absolutePath);
-		if (!$mount) {
-			return $results;
-		}
 
 		if ($useParentMount) {
 			// find out if something is mounted directly on the path
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 8d1f377251c..38720ab71c0 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -95,6 +95,7 @@ use OC\Files\Mount\RootMountProvider;
 use OC\Files\Node\HookConnector;
 use OC\Files\Node\LazyRoot;
 use OC\Files\Node\Root;
+use OC\Files\SetupManager;
 use OC\Files\Storage\StorageFactory;
 use OC\Files\Template\TemplateManager;
 use OC\Files\Type\Loader;
@@ -216,6 +217,7 @@ use OCP\L10N\IFactory;
 use OCP\LDAP\ILDAPProvider;
 use OCP\LDAP\ILDAPProviderFactory;
 use OCP\Lock\ILockingProvider;
+use OCP\Lockdown\ILockdownManager;
 use OCP\Log\ILogFactory;
 use OCP\Mail\IMailer;
 use OCP\Remote\Api\IApiFactory;
@@ -423,7 +425,8 @@ class Server extends ServerContainer implements IServerContainer {
 				null,
 				$c->get(IUserMountCache::class),
 				$this->get(ILogger::class),
-				$this->get(IUserManager::class)
+				$this->get(IUserManager::class),
+				$this->get(IEventDispatcher::class),
 			);
 
 			$previewConnector = new \OC\Preview\WatcherConnector(
@@ -1091,6 +1094,11 @@ class Server extends ServerContainer implements IServerContainer {
 		/** @deprecated 19.0.0 */
 		$this->registerDeprecatedAlias('LockingProvider', ILockingProvider::class);
 
+		$this->registerAlias(ILockdownManager::class, 'LockdownManager');
+		$this->registerService(SetupManager::class, function ($c) {
+			// create the setupmanager through the mount manager to resolve the cyclic dependency
+			return $c->get(\OC\Files\Mount\Manager::class)->getSetupManager();
+		});
 		$this->registerAlias(IMountManager::class, \OC\Files\Mount\Manager::class);
 		/** @deprecated 19.0.0 */
 		$this->registerDeprecatedAlias('MountManager', IMountManager::class);
diff --git a/lib/private/legacy/OC_Util.php b/lib/private/legacy/OC_Util.php
index 40dcbb13b93..ceed79bc9d5 100644
--- a/lib/private/legacy/OC_Util.php
+++ b/lib/private/legacy/OC_Util.php
@@ -66,6 +66,7 @@
 
 use bantu\IniGetWrapper\IniGetWrapper;
 use OC\AppFramework\Http\Request;
+use OC\Files\SetupManager;
 use OCP\Files\Template\ITemplateManager;
 use OCP\IConfig;
 use OCP\IGroupManager;
@@ -78,8 +79,6 @@ class OC_Util {
 	public static $scripts = [];
 	public static $styles = [];
 	public static $headers = [];
-	private static $rootFsSetup = false;
-	private static $fsSetup = false;
 
 	/** @var array Local cache of version.php */
 	private static $versionCache = null;
@@ -89,122 +88,6 @@ class OC_Util {
 	}
 
 	/**
-	 * Can be set up
-	 *
-	 * @param string $user
-	 * @return boolean
-	 * @description configure the initial filesystem based on the configuration
-	 * @suppress PhanDeprecatedFunction
-	 * @suppress PhanAccessMethodInternal
-	 */
-	public static function setupRootFS(string $user = '') {
-		//setting up the filesystem twice can only lead to trouble
-		if (self::$rootFsSetup) {
-			return false;
-		}
-
-		\OC::$server->getEventLogger()->start('setup_root_fs', 'Setup root filesystem');
-
-		// load all filesystem apps before, so no setup-hook gets lost
-		OC_App::loadApps(['filesystem']);
-
-		self::$rootFsSetup = true;
-
-		\OC\Files\Filesystem::initMountManager();
-
-		$prevLogging = \OC\Files\Filesystem::logWarningWhenAddingStorageWrapper(false);
-		\OC\Files\Filesystem::addStorageWrapper('mount_options', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if ($storage->instanceOfStorage('\OC\Files\Storage\Common')) {
-				/** @var \OC\Files\Storage\Common $storage */
-				$storage->setMountOptions($mount->getOptions());
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('enable_sharing', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if (!$mount->getOption('enable_sharing', true)) {
-				return new \OC\Files\Storage\Wrapper\PermissionsMask([
-					'storage' => $storage,
-					'mask' => \OCP\Constants::PERMISSION_ALL - \OCP\Constants::PERMISSION_SHARE
-				]);
-			}
-			return $storage;
-		});
-
-		// install storage availability wrapper, before most other wrappers
-		\OC\Files\Filesystem::addStorageWrapper('oc_availability', function ($mountPoint, \OCP\Files\Storage\IStorage $storage) {
-			if (!$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
-				return new \OC\Files\Storage\Wrapper\Availability(['storage' => $storage]);
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('oc_encoding', function ($mountPoint, \OCP\Files\Storage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			if ($mount->getOption('encoding_compatibility', false) && !$storage->instanceOfStorage('\OCA\Files_Sharing\SharedStorage') && !$storage->isLocal()) {
-				return new \OC\Files\Storage\Wrapper\Encoding(['storage' => $storage]);
-			}
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('oc_quota', function ($mountPoint, $storage) {
-			// set up quota for home storages, even for other users
-			// which can happen when using sharing
-
-			/**
-			 * @var \OC\Files\Storage\Storage $storage
-			 */
-			if ($storage->instanceOfStorage('\OC\Files\Storage\Home')
-				|| $storage->instanceOfStorage('\OC\Files\ObjectStore\HomeObjectStoreStorage')
-			) {
-				/** @var \OC\Files\Storage\Home $storage */
-				if (is_object($storage->getUser())) {
-					$quota = OC_Util::getUserQuota($storage->getUser());
-					if ($quota !== \OCP\Files\FileInfo::SPACE_UNLIMITED) {
-						return new \OC\Files\Storage\Wrapper\Quota(['storage' => $storage, 'quota' => $quota, 'root' => 'files']);
-					}
-				}
-			}
-
-			return $storage;
-		});
-
-		\OC\Files\Filesystem::addStorageWrapper('readonly', function ($mountPoint, \OCP\Files\Storage\IStorage $storage, \OCP\Files\Mount\IMountPoint $mount) {
-			/*
-			 * Do not allow any operations that modify the storage
-			 */
-			if ($mount->getOption('readonly', false)) {
-				return new \OC\Files\Storage\Wrapper\PermissionsMask([
-					'storage' => $storage,
-					'mask' => \OCP\Constants::PERMISSION_ALL & ~(
-							\OCP\Constants::PERMISSION_UPDATE |
-							\OCP\Constants::PERMISSION_CREATE |
-							\OCP\Constants::PERMISSION_DELETE
-						),
-				]);
-			}
-			return $storage;
-		});
-
-		OC_Hook::emit('OC_Filesystem', 'preSetup', ['user' => $user]);
-
-		\OC\Files\Filesystem::logWarningWhenAddingStorageWrapper($prevLogging);
-
-		/** @var \OCP\Files\Config\IMountProviderCollection $mountProviderCollection */
-		$mountProviderCollection = \OC::$server->query(\OCP\Files\Config\IMountProviderCollection::class);
-		$rootMountProviders = $mountProviderCollection->getRootMounts();
-
-		/** @var \OC\Files\Mount\Manager $mountManager */
-		$mountManager = \OC\Files\Filesystem::getMountManager();
-		foreach ($rootMountProviders as $rootMountProvider) {
-			$mountManager->addMount($rootMountProvider);
-		}
-
-		\OC::$server->getEventLogger()->end('setup_root_fs');
-
-		return true;
-	}
-
-	/**
 	 * Setup the file system
 	 *
 	 * @param string|null $user
@@ -214,14 +97,6 @@ class OC_Util {
 	 * @suppress PhanAccessMethodInternal
 	 */
 	public static function setupFS(?string $user = '') {
-		self::setupRootFS($user ?? '');
-
-		if (self::$fsSetup) {
-			return false;
-		}
-
-		\OC::$server->getEventLogger()->start('setup_fs', 'Setup filesystem');
-
 		// If we are not forced to load a specific user we load the one that is logged in
 		if ($user === '') {
 			$userObject = \OC::$server->get(\OCP\IUserSession::class)->getUser();
@@ -229,18 +104,14 @@ class OC_Util {
 			$userObject = \OC::$server->get(\OCP\IUserManager::class)->get($user);
 		}
 
-		//if we aren't logged in, or the user doesn't exist, there is no use to set up the filesystem
-		if ($userObject) {
-			self::$fsSetup = true;
-
-			$userDir = '/' . $userObject->getUID() . '/files';
-
-			//jail the user into his "home" directory
-			\OC\Files\Filesystem::init($userObject, $userDir);
+		/** @var SetupManager $setupManager */
+		$setupManager = \OC::$server->get(SetupManager::class);
 
-			OC_Hook::emit('OC_Filesystem', 'setup', ['user' => $userObject->getUID(), 'user_dir' => $userDir]);
+		if ($userObject) {
+			$setupManager->setupForUser($userObject);
+		} else {
+			$setupManager->setupRoot();
 		}
-		\OC::$server->getEventLogger()->end('setup_fs');
 		return true;
 	}
 
@@ -394,10 +265,9 @@ class OC_Util {
 	 * @suppress PhanUndeclaredMethod
 	 */
 	public static function tearDownFS() {
-		\OC\Files\Filesystem::tearDown();
-		\OC::$server->getRootFolder()->clearCache();
-		self::$fsSetup = false;
-		self::$rootFsSetup = false;
+		/** @var SetupManager $setupManager */
+		$setupManager = \OC::$server->get(SetupManager::class);
+		$setupManager->tearDown();
 	}
 
 	/**
diff --git a/lib/public/Files/Config/ICachedMountFileInfo.php b/lib/public/Files/Config/ICachedMountFileInfo.php
index 4de0a1218b4..e6aa2ec38c8 100644
--- a/lib/public/Files/Config/ICachedMountFileInfo.php
+++ b/lib/public/Files/Config/ICachedMountFileInfo.php
@@ -34,11 +34,11 @@ interface ICachedMountFileInfo extends ICachedMountInfo {
 	 * @return string
 	 * @since 13.0.0
 	 */
-	public function getInternalPath();
+	public function getInternalPath(): string;
 
 	/**
 	 * @return string
 	 * @since 13.0.0
 	 */
-	public function getPath();
+	public function getPath(): string;
 }
diff --git a/lib/public/Files/Config/ICachedMountInfo.php b/lib/public/Files/Config/ICachedMountInfo.php
index 812e79cdbc8..dafd2423fdc 100644
--- a/lib/public/Files/Config/ICachedMountInfo.php
+++ b/lib/public/Files/Config/ICachedMountInfo.php
@@ -35,31 +35,31 @@ interface ICachedMountInfo {
 	 * @return IUser
 	 * @since 9.0.0
 	 */
-	public function getUser();
+	public function getUser(): IUser;
 
 	/**
 	 * @return int the numeric storage id of the mount
 	 * @since 9.0.0
 	 */
-	public function getStorageId();
+	public function getStorageId(): int;
 
 	/**
 	 * @return int the fileid of the root of the mount
 	 * @since 9.0.0
 	 */
-	public function getRootId();
+	public function getRootId(): int;
 
 	/**
-	 * @return Node the root node of the mount
+	 * @return Node|null the root node of the mount
 	 * @since 9.0.0
 	 */
-	public function getMountPointNode();
+	public function getMountPointNode(): ?Node;
 
 	/**
 	 * @return string the mount point of the mount for the user
 	 * @since 9.0.0
 	 */
-	public function getMountPoint();
+	public function getMountPoint(): string;
 
 	/**
 	 * Get the id of the configured mount
@@ -67,7 +67,7 @@ interface ICachedMountInfo {
 	 * @return int|null mount id or null if not applicable
 	 * @since 9.1.0
 	 */
-	public function getMountId();
+	public function getMountId(): ?int;
 
 	/**
 	 * Get the internal path (within the storage) of the root of the mount
@@ -75,7 +75,7 @@ interface ICachedMountInfo {
 	 * @return string
 	 * @since 11.0.0
 	 */
-	public function getRootInternalPath();
+	public function getRootInternalPath(): string;
 
 	/**
 	 * Get the class of the mount provider that this mount originates from
diff --git a/lib/public/Files/Events/Node/FilesystemTornDownEvent.php b/lib/public/Files/Events/Node/FilesystemTornDownEvent.php
new file mode 100644
index 00000000000..3e7780c827e
--- /dev/null
+++ b/lib/public/Files/Events/Node/FilesystemTornDownEvent.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\Files\Events\Node;
+
+use OCP\EventDispatcher\Event;
+
+/**
+ * Event fired after the filesystem has been torn down
+ *
+ * @since 24.0.0
+ */
+class FilesystemTornDownEvent extends Event {
+}
diff --git a/lib/public/Files/Mount/IMountManager.php b/lib/public/Files/Mount/IMountManager.php
index 1e8c674f8f5..aa760f53e96 100644
--- a/lib/public/Files/Mount/IMountManager.php
+++ b/lib/public/Files/Mount/IMountManager.php
@@ -37,7 +37,7 @@ interface IMountManager {
 	/**
 	 * Add a new mount
 	 *
-	 * @param \OCP\Files\Mount\IMountPoint $mount
+	 * @param IMountPoint $mount
 	 * @since 8.2.0
 	 */
 	public function addMount(IMountPoint $mount);
@@ -63,16 +63,16 @@ interface IMountManager {
 	 * Find the mount for $path
 	 *
 	 * @param string $path
-	 * @return \OCP\Files\Mount\IMountPoint|null
+	 * @return IMountPoint
 	 * @since 8.2.0
 	 */
-	public function find(string $path);
+	public function find(string $path): ?IMountPoint;
 
 	/**
 	 * Find all mounts in $path
 	 *
 	 * @param string $path
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return IMountPoint[]
 	 * @since 8.2.0
 	 */
 	public function findIn(string $path): array;
@@ -88,13 +88,13 @@ interface IMountManager {
 	 * Find mounts by storage id
 	 *
 	 * @param string $id
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return IMountPoint[]
 	 * @since 8.2.0
 	 */
 	public function findByStorageId(string $id): array;
 
 	/**
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return IMountPoint[]
 	 * @since 8.2.0
 	 */
 	public function getAll(): array;
@@ -103,7 +103,7 @@ interface IMountManager {
 	 * Find mounts by numeric storage id
 	 *
 	 * @param int $id
-	 * @return \OCP\Files\Mount\IMountPoint[]
+	 * @return IMountPoint[]
 	 * @since 8.2.0
 	 */
 	public function findByNumericId(int $id): array;