When I change a file in an AUFS-mount, that change gets stored somehow in the rw-layer.

It is clear how new/changed files are stored in the rw-layer, but how get deleted files remembered there?

1 Answer 1


All union filesystems with read-only and read-write branches use some form of "whiteout" marker on a read-write branch to suppress a file that exists on a read-only branch. AUFS is no different.

For AUFS, the whiteout markers are files called:


located in the same directory where the deleted file used to live, and where <filename> is the filename of the file that was deleted.

Ref: aufs manpage, information about whiteout

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .