[PATCH 0/2] Fix NFS client state recovery

[Trond Myklebust]

- Fix up client to work with NFSv4/v4.1 all or nothing reboot recovery
- Fix open/state recovery error handling


Trond Myklebust (2):
NFSv4: Don't convert unreclaimed locks on STALE_CLIENTID
NFSv4: fix open/lock state recovery error handling

fs/nfs/nfs4state.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)

[Trond Myklebust]

If the server tells us that it rebooted, then we should assume that
we can reclaim all locks or none, and we should rely on the server
returning NFS4ERR_NO_GRACE if we cannot reclaim all outstanding locks.

This patch removes those instances where we deliberately convert
unreclaimed locks.

Cc: stable-***@public.gmane.org
Signed-off-by: Trond Myklebust <trond.myklebust-7I+n7zu2hftEKMMhf/***@public.gmane.org>
---
fs/nfs/nfs4state.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 22fe35104c0c..5321b8c71a35 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1648,7 +1648,6 @@ static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
break;
case -NFS4ERR_STALE_CLIENTID:
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
- nfs4_state_clear_reclaim_reboot(clp);
nfs4_state_start_reclaim_reboot(clp);
break;
case -NFS4ERR_EXPIRED:
@@ -1761,7 +1760,6 @@ static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
break;
case -NFS4ERR_STALE_CLIENTID:
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- nfs4_state_clear_reclaim_reboot(clp);
nfs4_state_start_reclaim_reboot(clp);
break;
case -NFS4ERR_CLID_INUSE:

[Trond Myklebust]

The current open/lock state recovery unfortunately does not handle errors
such as NFS4ERR_CONN_NOT_BOUND_TO_SESSION correctly. Instead of looping,
just proceeds as if the state manager is finished recovering.
This patch ensures that we loop back, handle higher priority errors
and complete the open/lock state recovery.

Cc: stable-***@public.gmane.org
Signed-off-by: Trond Myklebust <trond.myklebust-7I+n7zu2hftEKMMhf/***@public.gmane.org>
---
fs/nfs/nfs4state.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 5321b8c71a35..0d9ddbda3bb5 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1704,7 +1704,8 @@ restart:
if (status < 0) {
set_bit(ops->owner_flag_bit, &sp->so_flags);
nfs4_put_state_owner(sp);
- return nfs4_recovery_handle_error(clp, status);
+ status = nfs4_recovery_handle_error(clp, status);
+ return (status != 0) ? status : -EAGAIN;
}

nfs4_put_state_owner(sp);
@@ -1713,7 +1714,7 @@ restart:
spin_unlock(&clp->cl_lock);
}
rcu_read_unlock();
- return status;
+ return 0;
}

static int nfs4_check_lease(struct nfs_client *clp)
@@ -2364,14 +2365,11 @@ static void nfs4_state_manager(struct nfs_client *clp)
section = "reclaim reboot";
status = nfs4_do_reclaim(clp,
clp->cl_mvops->reboot_recovery_ops);
- if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
- test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
- continue;
- nfs4_state_end_reclaim_reboot(clp);
- if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
+ if (status == -EAGAIN)
continue;
if (status < 0)
goto out_error;
+ nfs4_state_end_reclaim_reboot(clp);
}

/* Now recover expired state... */
@@ -2379,9 +2377,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
section = "reclaim nograce";
status = nfs4_do_reclaim(clp,
clp->cl_mvops->nograce_recovery_ops);
- if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
- test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
- test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
+ if (status == -EAGAIN)
continue;
if (status < 0)
goto out_error;