tree 4031f8272393958a75d8cb14548905afca86d71c
parent 9072cef15269c56fde0ae4c6c439c39dfb594e98
author Martijn Coenen <maco@google.com> 1574938433 +0100
committer Martijn Coenen <maco@google.com> 1575992956 +0100

Use sdcardfs for pass-through mounts.

The pass-through mount is used by MediaProvider to access external
storage. Previously, it was the raw filesystem (eg ext4/f2fs); the
problem with that is that the permissions on that filesystem don't allow
MediaProvider to access all the files it needs to - in particular
directories under Android/

To solve this problem, we can have the pass-through mount sit on top of
sdcardfs instead of the raw filesystem. This means we need to mount
sdcardfs even in case we're using FUSE, but we already needed to do this
anyway for other performance reasons.

Bug: 135341433
Test: atest AdoptableHostTest
Change-Id: I893d5e5076c5096d2d55212f643c9a857242e964