tree 67acfc58f5e952e4fd2720d2e5e77409db40b6b8
parent 5f3ef64f4da1c587cdcfaaac72311225b7df094c
author Tyler Hicks <tyhicks@linux.vnet.ibm.com> 1257324481 -0600
committer Tyler Hicks <tyhicks@linux.vnet.ibm.com> 1263961929 -0600

eCryptfs: Add getattr function

The i_blocks field of an eCryptfs inode cannot be trusted, but
generic_fillattr() uses it to instantiate the blocks field of a stat()
syscall when a filesystem doesn't implement its own getattr().  Users
have noticed that the output of du is incorrect on newly created files.

This patch creates ecryptfs_getattr() which calls into the lower
filesystem's getattr() so that eCryptfs can use its kstat.blocks value
after calling generic_fillattr().  It is important to note that the
block count includes the eCryptfs metadata stored in the beginning of
the lower file plus any padding used to fill an extent before
encryption.

https://bugs.launchpad.net/ecryptfs/+bug/390833

Reported-by: Dominic Sacré <dominic.sacre@gmx.de>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>