tree ba286205f1ad11119a06b77fb6671ce9aacac13a
parent 36ad4885c47c2187822f2783fb46fde2d36bf200
author Trond Myklebust <Trond.Myklebust@netapp.com> 1188571517 -0400
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1188617205 -0700

NFS: Fix the mount regression

This avoids the recent NFS mount regression (returning EBUSY when
mounting the same filesystem twice with different parameters).

The best I can do given the constraints appears to be to have the kernel
first look for a superblock that matches both the fsid and the
user-specified mount options, and then spawn off a new superblock if
that search fails.

Note that this is not the same as specifying nosharecache everywhere
since nosharecache will never attempt to match an existing superblock.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Tested-by: Hua Zhong <hzhong@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>