tree 908abe5f8e8e336f50096c990cd629b2d96e950b
parent 3ccf6a0665ee41d41777851eda9ad789d909564d
author Zim <zezeozue@google.com> 1615378014 +0000
committer Alessio Balsini <balsini@google.com> 1615824765 +0000

Improve transcoded FUSE cache/passthrough access

This change updates the node#transforms_complete flag on each lookup.

With the correct transforms_complete flag we can ensure the kernel
page cache has the correct bytes after the transcode file cache has
been cleared.

We achieve this by flusing the page cache on FUSE_OPEN
if transforms is not complete. This fixes the case where the following
happens:
1. Read transcoded content and set transforms_complete=true
2. Clear the transcoded cache
3. Read transcoded content again

Lastly, we also set direct_io=true if transforms_complete=false. This
will allow us handle transcode failures more gracefully by returning
the original bytes without corrupting the kernel page cache

Test: atest TranscodeTest
Bug: 181846007
Change-Id: Ibb93a79f2544688bf440180d9e1dbae61f76d287