The "deleteAll" method on the Common storage class isn't used anywhere.
Also, it isn't defined on the Storage interface so this fix removes it
completely.

The method deleteAll() doesn't officially exist on the Storage class as
it's not defined on the interface, which means it fails on the Quota
storage wrapper and might fail on some external storage classes.
Also, this here is the only use case for that one method.

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/owncloud/core/inspections/cdfecc4e-a37e-4233-8025-f0d7252a8720

Enabled analysis tools:
 - PHP Analyzer
 - JSHint
 - PHP Copy/Paste Detector
 - PHP PDepend

Issue #7111

Added isLocal() method to Storage to find out whether the storage is
local or not.
This method is used for the x-sendfile logic to find out whether to add
the headers.

close statement was never executed due to it being after a return
statement.

do not share users data with config files

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

When calling fopen() on some storage types, these return false instead
of throwing an exception.

This fix makes sure that in case the stream wasn't opened (for example
when a file doesn't exist any more) the stream isn't wrapped.

Also added 'rb' as another case that doesn't need to be wrapped.

Fixes #6832

Add a FileInfo class which holds all info of a file and return that from getFileInfo, getDirectoryContent and search

The encrypted size was used when calculating folder sizes.
This fix now also sums up the unencrypted size and shows that one when
available.

Storage mount points are not deletable, so make sure that the unlink
operation and its hooks aren't run in such cases.

Note that some storages might recursively delete their contents when
calling unlink on their root. This fix prevents that as well.

Fixes #6526

This is to make sure that method isn't broken