SRU for Oneiric and Precise, and please apply to Quantal too.
== SRU Justification ==
== Impact ==
This bug is the result of existing eCryptfs inodes not
being evicted when they are the target of a rename()
syscall. The existing inodes are left around, meaning
that the lower inodes are also left around, until the
eCryptfs filesystem in unmounted. This means that disk
space is not properly freed when mv'ing a file on top
of another file.
This can be triggered for example by:
1 - Try to download some Ubuntu DVD versions with bit
torrent (so it reserves space).
2 - Fill your disk to the maximum and leave something
3 - Wait
4 - Disk space will go to 0 (it doesn't make any sense
since space has already been reserved)
5 - Ctrl+Alt+F1
There we can see some messages about ecryptfs :
ecryptfs_write_lower: octets_written [-28]; expected 
ecryptfs_encrypt_page: Error Attempting to write lower page; rc = [-22