> Ok, I fixed the few obvious bugs that I left in as an exercise to the
> reader and would be ready to commit the result after some more tests
> tomorrow.

please make sure it doesn't change on-wire filehandle.

> While playing wiht this I noticed that we do a *lot* calls to vfs_composefh()
> in kernels with NFS server support:
> 
>  sys_read -> dofileread -> vn_read -> VOP_LEASE() -> genfs_lease_check()
>   -> nqsrv_getlease() -> vfs_composefh()
> 
> This sounds pretty expensive, is it a bug, or is it realy needed?

maybe we can optimize "not exported" case.

YAMAMOTO Takashi