Re: [PATCH v2 3/3] NFSv4: Fail the truncate() if the lock/open stateid is invalid

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On Tue, Mar 4, 2014 at 2:05 PM, Trond Myklebust
<trond.myklebust@xxxxxxxxxxxxxxx> wrote:
> If the open stateid could not be recovered, or the file locks were lost,
> then we should fail the truncate() operation altogether.
>
> Reported-by: Andy Adamson <andros@xxxxxxxxxx>
> Link: http://lkml.kernel.org/r/1393954269-3974-1-git-send-email-andros@xxxxxxxxxx
> Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
> ---
>  fs/nfs/nfs4proc.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 44e088dc357c..daf41182ecfb 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -2398,13 +2398,16 @@ static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
>
>         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
>                 /* Use that stateid */
> -       } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
> +       } else if (truncate && state != NULL) {
>                 struct nfs_lockowner lockowner = {
>                         .l_owner = current->files,
>                         .l_pid = current->tgid,
>                 };
> -               nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
> -                               &lockowner);
> +               if (!nfs4_valid_open_stateid(state))
> +                       return -EBADF;
> +               if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
> +                               &lockowner) < 0)

AFICS this means -EIO = lost lock. Why fail the setattr? the file
handle is not bad.  Why not send a ZERO_STATEID?  At any rate, -EBADF
looks wrong to me.

-->Andy

> +                       return -EBADF;
>         } else
>                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
>
> --
> 1.8.5.3
>
> --
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