tree 537498aa91bbe1fbbfc7f2c1e00910ca7fbc2261
parent f3d47a3a6a1484a93c8cfe1e8c8d4399c95199c7
author Trond Myklebust <Trond.Myklebust@netapp.com> 1211326479 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1215619720 -0400

NFS: Add correct bounds checking to NFSv2 locks

NFSv2 file locking currently fails the Connectathon tests, because the
calls to the VFS locking code do not return an EINVAL error if the
struct file_lock overflows the 32-bit boundaries.

The problem is due to the fact that we occasionally call helpers from
fs/locks.c in order to avoid RPC calls to the server when we know that a
local process holds the lock. These helpers are, of course, always
64-bit enabled, so EINVAL is not returned in cases when it would if
the call had gone to the NLM code.

For consistency, we therefore add support for a bounds-checking helper.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>