tree a25266f9db482ce9dd8e663148ffb0f1a524bd83
parent e5004753388dcf5e1b8a52ac0ab807d232340fbb
author Christoph Hellwig <hch@lst.de> 1241530885 +0200
committer Al Viro <viro@zeniv.linux.org.uk> 1244770566 -0400

enforce ->sync_fs is only called for rw superblock

Make sure a superblock really is writeable by checking MS_RDONLY
under s_umount.  sync_filesystems needed some re-arragement for
that, but all but one sync_filesystem caller had the correct locking
already so that we could add that check there.  cachefiles grew
s_umount locking.

I've also added a WARN_ON to sync_filesystem to assert this for
future callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>