From: Jeff Mahoney <jeffm@suse.com>
Date: Wed, 21 May 2014 17:28:07 +0000 (-0400)
Subject: reiserfs: call truncate_setsize under tailpack mutex
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~53^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22e7478ddbcb670e33fab72d0bbe7c394c3a2c84;p=pandora-kernel.git

reiserfs: call truncate_setsize under tailpack mutex

Prior to commit 0e4f6a791b1e (Fix reiserfs_file_release()), reiserfs
truncates serialized on i_mutex. They mostly still do, with the exception
of reiserfs_file_release. That blocks out other writers via the tailpack
mutex and the inode openers counter adjusted in reiserfs_file_open.

However, NFS will call reiserfs_setattr without having called ->open, so
we end up with a race when nfs is calling ->setattr while another
process is releasing the file. Ultimately, it triggers the
BUG_ON(inode->i_size != new_file_size) check in maybe_indirect_to_direct.

The solution is to pull the lock into reiserfs_setattr to encompass the
truncate_setsize call as well.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---

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