From: Omar Sandoval <osandov@osandov.com>
Date: Thu, 8 Jan 2015 09:18:30 +0000 (-0800)
Subject: nfs: prevent truncate on active swapfile
X-Git-Tag: fixes-v4.0-rc1~136^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a7ed3fff3bb22828f7d7ba6b75c7d22ee54df38;p=pandora-kernel.git

nfs: prevent truncate on active swapfile

Most filesystems prevent truncation of an active swapfile by way of
inode_newsize_ok, called from inode_change_ok. NFS doesn't call either
from nfs_setattr, presumably because most of these checks are expected
to be done server-side. However, the IS_SWAPFILE check can only be done
client-side, and truncating a swapfile can't possibly be good.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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