[PATCH 1/1] NFSv4.1 handle ERR_DELAY error reclaiming locking state on delegation recall

[PATCH 1/1] NFSv4.1 handle ERR_DELAY error reclaiming locking state on delegation recall

[Olga Kornievskaia]

From: Olga Kornievskaia <kolga@netapp.com>

A client should be able to handle getting an ERR_DELAY error
while doing a LOCK call to reclaim state due to delegation being
recalled. This is a transient error that can happen due to server
moving its volumes and invalidating its file location cache and
upon reference to it during the LOCK call needing to do an
expensive lookup (leading to an ERR_DELAY error on a PUTFH).

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/nfs4proc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index dbd01548335b..4a6cfb497103 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7298,7 +7298,12 @@ int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state,
 	err = nfs4_set_lock_state(state, fl);
 	if (err != 0)
 		return err;
-	err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
+	do {
+		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
+		if (err != -NFS4ERR_DELAY)
+			break;
+		ssleep(1);
+	} while (err == -NFS4ERR_DELAY);
 	return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
 }
 
-- 
2.18.1

Re: [PATCH 1/1] NFSv4.1 handle ERR_DELAY error reclaiming locking state on delegation recall

[Olga Kornievskaia]

Any comments on this patch? Thank you.

On Thu, Aug 20, 2020 at 6:50 PM Olga Kornievskaia
<olga.kornievskaia@gmail.com> wrote:
>
> From: Olga Kornievskaia <kolga@netapp.com>
>
> A client should be able to handle getting an ERR_DELAY error
> while doing a LOCK call to reclaim state due to delegation being
> recalled. This is a transient error that can happen due to server
> moving its volumes and invalidating its file location cache and
> upon reference to it during the LOCK call needing to do an
> expensive lookup (leading to an ERR_DELAY error on a PUTFH).
>
> Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
> ---
>  fs/nfs/nfs4proc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index dbd01548335b..4a6cfb497103 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -7298,7 +7298,12 @@ int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state,
>         err = nfs4_set_lock_state(state, fl);
>         if (err != 0)
>                 return err;
> -       err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
> +       do {
> +               err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
> +               if (err != -NFS4ERR_DELAY)
> +                       break;
> +               ssleep(1);
> +       } while (err == -NFS4ERR_DELAY);
>         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
>  }
>
> --
> 2.18.1
>