2 files changed, 51 insertions, 22 deletions

diff --git a/lib/private/Files/Node/Folder.php b/lib/private/Files/Node/Folder.php
index e67e4817e2a..b12ded8e796 100644
--- a/lib/private/Files/Node/Folder.php
+++ b/lib/private/Files/Node/Folder.php
@@ -28,6 +28,7 @@ namespace OC\Files\Node;
 
 use OC\DB\QueryBuilder\Literal;
 use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\Files\Config\ICachedMountInfo;
 use OCP\Files\FileInfo;
 use OCP\Files\Mount\IMountPoint;
 use OCP\Files\NotFoundException;
@@ -83,7 +84,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 	public function getDirectoryListing() {
 		$folderContent = $this->view->getDirectoryContent($this->path);
 
-		return array_map(function(FileInfo $info) {
+		return array_map(function (FileInfo $info) {
 			if ($info->getMimetype() === 'httpd/unix-directory') {
 				return new Folder($this->root, $this->view, $info->getPath(), $info);
 			} else {
@@ -253,7 +254,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 			}
 		}
 
-		return array_map(function(FileInfo $file) {
+		return array_map(function (FileInfo $file) {
 			return $this->createNode($file->getPath(), $file);
 		}, $files);
 	}
@@ -263,29 +264,45 @@ class Folder extends Node implements \OCP\Files\Folder {
 	 * @return \OC\Files\Node\Node[]
 	 */
 	public function getById($id) {
+		$mountCache = $this->root->getUserMountCache();
+		$mountsContainingFile = $mountCache->getMountsForFileId($id);
 		$mounts = $this->root->getMountsIn($this->path);
 		$mounts[] = $this->root->getMount($this->path);
-		// 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);
+		/** @var IMountPoint[] $folderMounts */
+		$folderMounts = array_combine(array_map(function (IMountPoint $mountPoint) {
+			return $mountPoint->getMountPoint();
+		}, $mounts), $mounts);
+
+		/** @var ICachedMountInfo[] $mountsContainingFile */
+		$mountsContainingFile = array_values(array_filter($mountsContainingFile, function (ICachedMountInfo $cachedMountInfo) use ($folderMounts) {
+			return isset($folderMounts[$cachedMountInfo->getMountPoint()]);
+		}));
 
-		$nodes = array();
-		foreach ($mounts as $mount) {
-			/**
-			 * @var \OC\Files\Mount\MountPoint $mount
-			 */
-			if ($mount->getStorage()) {
-				$cache = $mount->getStorage()->getCache();
-				$internalPath = $cache->getPathById($id);
-				if (is_string($internalPath)) {
-					$fullPath = $mount->getMountPoint() . $internalPath;
-					if (!is_null($path = $this->getRelativePath($fullPath))) {
-						$nodes[] = $this->get($path);
-					}
-				}
-			}
+		if (count($mountsContainingFile) === 0) {
+			return [];
 		}
-		return $nodes;
+
+		// we only need to get the cache info once, since all mounts we found point to the same storage
+
+		$mount = $folderMounts[$mountsContainingFile[0]->getMountPoint()];
+		$cacheEntry = $mount->getStorage()->getCache()->get($id);
+		// cache jails will hide the "true" internal path
+		$internalPath = ltrim($mountsContainingFile[0]->getRootInternalPath() . '/' . $cacheEntry->getPath(), '/');
+
+		$nodes = array_map(function (ICachedMountInfo $cachedMountInfo) use ($cacheEntry, $folderMounts, $internalPath) {
+			$mount = $folderMounts[$cachedMountInfo->getMountPoint()];
+			$pathRelativeToMount = substr($internalPath, strlen($cachedMountInfo->getRootInternalPath()));
+			$pathRelativeToMount = ltrim($pathRelativeToMount, '/');
+			$absolutePath = $cachedMountInfo->getMountPoint() . $pathRelativeToMount;
+			return $this->root->createNode($absolutePath, new \OC\Files\FileInfo(
+				$absolutePath, $mount->getStorage(), $cacheEntry->getPath(), $cacheEntry, $mount,
+				\OC::$server->getUserManager()->get($mount->getStorage()->getOwner($pathRelativeToMount))
+			));
+		}, $mountsContainingFile);
+
+		return array_filter($nodes, function (Node $node) {
+			return $this->getRelativePath($node->getPath());
+		});
 	}
 
 	public function getFreeSpace() {
diff --git a/lib/private/Files/Node/Root.php b/lib/private/Files/Node/Root.php
index 007847fb513..0cda2c8b822 100644
--- a/lib/private/Files/Node/Root.php
+++ b/lib/private/Files/Node/Root.php
@@ -31,6 +31,7 @@ namespace OC\Files\Node;
 use OC\Cache\CappedMemoryCache;
 use OC\Files\Mount\Manager;
 use OC\Files\Mount\MountPoint;
+use OCP\Files\Config\IUserMountCache;
 use OCP\Files\NotFoundException;
 use OCP\Files\NotPermittedException;
 use OC\Hooks\PublicEmitter;
@@ -75,16 +76,23 @@ class Root extends Folder implements IRootFolder {
 	private $userFolderCache;
 
 	/**
+	 * @var IUserMountCache
+	 */
+	private $userMountCache;
+
+	/**
 	 * @param \OC\Files\Mount\Manager $manager
 	 * @param \OC\Files\View $view
 	 * @param \OC\User\User|null $user
+	 * @param IUserMountCache $userMountCache
 	 */
-	public function __construct($manager, $view, $user) {
+	public function __construct($manager, $view, $user, IUserMountCache $userMountCache) {
 		parent::__construct($this, $view, '');
 		$this->mountManager = $manager;
 		$this->user = $user;
 		$this->emitter = new PublicEmitter();
 		$this->userFolderCache = new CappedMemoryCache();
+		$this->userMountCache = $userMountCache;
 	}
 
 	/**
@@ -361,4 +369,8 @@ class Root extends Folder implements IRootFolder {
 	public function clearCache() {
 		$this->userFolderCache = new CappedMemoryCache();
 	}
+
+	public function getUserMountCache() {
+		return $this->userMountCache;
+	}
 }