cvs commit: src/sys/nfsclient nfs_vnops.c

[Alfred Perlstein]

This will allow interested parties to smp'ify NFS, otherwise you
need a global lock.  It also will allow us to remove a lot of the
hacks needed to deal with the fake exclusivity of the locking that
was going on here.

This could be MFC'd but I don't see the point right now.

* Alfred Perlstein <alfred at FreeBSD.org> [031110 16:33] wrote:
> alfred      2003/11/10 16:32:46 PST
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/nfsclient        nfs_vnops.c 
>   Log:
>   Stop using shared locks for nfs vop locks.
>   
>   The reason this was done was to avoid a race to the root when an
>   NFS server went down.  However a semi-recent change to the way that
>   the kernel's lookup() routine traverses mount points prevents this.
>   
>   Rev 1.39 of vfs_lookup.c changed the ordering of locks such that we
>   aquire a shared lock on the mount point being accessed and then drop
>   the directory vnode lock before requesting the target lock.
>   
>   With that in place we no longer need shared locks for NFS to prevent
>   race to the root lockups.
>   
>   Revision  Changes    Path
>   1.214     +0 -3      src/sys/nfsclient/nfs_vnops.c

-- 
- Alfred Perlstein
- Research Engineering Development Inc.
- email: bright at mu.org cell: 408-480-4684