Give storage backends the option to define having no known free space

When this is the case only the configured max upload size is taking into account for uploading

apps/files/ajax/upload.php

@@ -48,7 +48,7 @@ $totalSize = 0;
 foreach ($files['size'] as $size) {
 	$totalSize += $size;
 }
-if ($totalSize > \OC\Files\Filesystem::free_space($dir)) {
+if ($totalSize > $maxUploadFilesize) {
 	OCP\JSON::error(array('data' => array('message' => $l->t('Not enough storage available'),
 		'uploadMaxFilesize' => $maxUploadFilesize,
 		'maxHumanFilesize' => $maxHumanFilesize)));

apps/files_external/lib/amazons3.php

@@ -229,11 +229,6 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 		return false;
 	}
 
-	public function free_space($path) {
-		// Infinite?
-		return false;
-	}
-
 	public function touch($path, $mtime = null) {
 		if (is_null($mtime)) {
 			$mtime = time();

apps/files_external/lib/sftp.php

@@ -241,10 +241,6 @@ class SFTP extends \OC\Files\Storage\Common {
 		}
 	}
 
-	public function free_space($path) {
-		return -1;
-	}
-
 	public function touch($path, $mtime=null) {
 		try {
 			if (!is_null($mtime)) return false;

apps/files_external/lib/streamwrapper.php

@@ -76,10 +76,6 @@ abstract class StreamWrapper extends \OC\Files\Storage\Common{
 		return fopen($this->constructUrl($path), $mode);
 	}
 
-	public function free_space($path) {
-		return 0;
-	}
-
 	public function touch($path, $mtime=null) {
 		$this->init();
 		if(is_null($mtime)) {

apps/files_external/lib/swift.php

@@ -478,10 +478,6 @@ class SWIFT extends \OC\Files\Storage\Common{
 		}
 	}
 
-	public function free_space($path) {
-		return 1024*1024*1024*8;
-	}
-
 	public function touch($path, $mtime=null) {
 		$this->init();
 		$obj=$this->getObject($path);

apps/files_external/lib/webdav.php

@@ -222,7 +222,7 @@ class DAV extends \OC\Files\Storage\Common{
 				return 0;
 			}
 		} catch(\Exception $e) {
-			return 0;
+			return \OC\Files\FREE_SPACE_UNKNOWN;
 		}
 	}
 

lib/files/filesystem.php

@@ -29,6 +29,8 @@
 
 namespace OC\Files;
 
+const FREE_SPACE_UNKNOWN = -2;
+
 class Filesystem {
 	public static $loaded = false;
 	/**

lib/files/storage/common.php

@@ -301,4 +301,13 @@ abstract class Common implements \OC\Files\Storage\Storage {
 		}
 		return implode('/', $output);
 	}
+
+	/**
+	 * get the free space in the storage
+	 * @param $path
+	 * return int
+	 */
+	public function free_space($path){
+		return \OC\Files\FREE_SPACE_UNKNOWN;
+	}
 }

lib/helper.php

@@ -762,9 +762,13 @@ class OC_Helper {
 		$maxUploadFilesize = min($upload_max_filesize, $post_max_size);
 
 		$freeSpace = \OC\Files\Filesystem::free_space($dir);
-		$freeSpace = max($freeSpace, 0);
+		if($freeSpace !== \OC\Files\FREE_SPACE_UNKNOWN){
+			$freeSpace = max($freeSpace, 0);
 
-		return min($maxUploadFilesize, $freeSpace);
+			return min($maxUploadFilesize, $freeSpace);
+		} else {
+			return $maxUploadFilesize;
+		}
 	}
 
 	/**