NFSv4: Handle more errors when recovering open file and locking state

It is possible for servers to return NFS4ERR_BAD_STATEID when
the state management code is recovering locks or is reclaiming state when
returning a delegation. Ensure that we handle that case.
While we're at it, add in handlers for NFS4ERR_STALE,
NFS4ERR_ADMIN_REVOKED, NFS4ERR_OPENMODE, NFS4ERR_DENIED and
NFS4ERR_STALE_STATEID, since the protocol appears to allow for them too.

Also handle ENOMEM...

Finally, rather than add new NFSv4.0-specific errors and error handling into
the generic delegation code, move that open file and locking state error
handling into the NFSv4 layer.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 56 insertions, 16 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d326193c9785..55314e721632 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -804,16 +804,30 @@ int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state
                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
                 switch (err) {
                         case 0:
-                                return err;
+                        case -ENOENT:
+                        case -ESTALE:
+                                goto out;
                         case -NFS4ERR_STALE_CLIENTID:
                         case -NFS4ERR_STALE_STATEID:
                         case -NFS4ERR_EXPIRED:
                                 /* Don't recall a delegation if it was lost */
                                 nfs4_schedule_state_recovery(server->nfs_client);
-                                return err;
+                                goto out;
+                        case -ERESTARTSYS:
+                                /*
+                                 * The show must go on: exit, but mark the
+                                 * stateid as needing recovery.
+                                 */
+                        case -NFS4ERR_ADMIN_REVOKED:
+                        case -NFS4ERR_BAD_STATEID:
+                                nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
+                        case -ENOMEM:
+                                err = 0;
+                                goto out;
                 }
                 err = nfs4_handle_exception(server, err, &exception);
         } while (exception.retry);
+out:
         return err;
 }
 
@@ -3487,8 +3501,6 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *f
         ret = nfs4_wait_for_completion_rpc_task(task);
         if (ret == 0) {
                 ret = data->rpc_status;
-                if (ret == -NFS4ERR_DENIED)
-                        ret = -EAGAIN;
         } else
                 data->cancelled = 1;
         rpc_put_task(task);
@@ -3576,9 +3588,11 @@ static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *
         int err;
 
         do {
+                err = _nfs4_proc_setlk(state, cmd, request);
+                if (err == -NFS4ERR_DENIED)
+                        err = -EAGAIN;
                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
-                                _nfs4_proc_setlk(state, cmd, request),
-                                &exception);
+                                err, &exception);
         } while (exception.retry);
         return err;
 }
@@ -3635,11 +3649,29 @@ int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
                                 printk(KERN_ERR "%s: unhandled error %d.\n",
                                                 __func__, err);
                         case 0:
+                        case -ESTALE:
                                 goto out;
                         case -NFS4ERR_EXPIRED:
                         case -NFS4ERR_STALE_CLIENTID:
+                        case -NFS4ERR_STALE_STATEID:
                                 nfs4_schedule_state_recovery(server->nfs_client);
                                 goto out;
+                        case -ERESTARTSYS:
+                                /*
+                                 * The show must go on: exit, but mark the
+                                 * stateid as needing recovery.
+                                 */
+                        case -NFS4ERR_ADMIN_REVOKED:
+                        case -NFS4ERR_BAD_STATEID:
+                        case -NFS4ERR_OPENMODE:
+                                nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
+                                err = 0;
+                                goto out;
+                        case -ENOMEM:
+                        case -NFS4ERR_DENIED:
+                                /* kill_proc(fl->fl_pid, SIGLOST, 1); */
+                                err = 0;
+                                goto out;
                         case -NFS4ERR_DELAY:
                                 break;
                 }
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 0298e909559f..6e094e95cf0f 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -854,25 +854,29 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
                 if (nfs_file_open_context(fl->fl_file)->state != state)
                         continue;
                 status = ops->recover_lock(state, fl);
-                if (status >= 0)
-                        continue;
                 switch (status) {
+                        case 0:
+                                break;
+                        case -ESTALE:
+                        case -NFS4ERR_ADMIN_REVOKED:
+                        case -NFS4ERR_STALE_STATEID:
+                        case -NFS4ERR_BAD_STATEID:
+                        case -NFS4ERR_EXPIRED:
+                        case -NFS4ERR_NO_GRACE:
+                        case -NFS4ERR_STALE_CLIENTID:
+                                goto out;
                         default:
                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
                                                 __func__, status);
-                        case -NFS4ERR_EXPIRED:
-                        case -NFS4ERR_NO_GRACE:
+                        case -ENOMEM:
+                        case -NFS4ERR_DENIED:
                         case -NFS4ERR_RECLAIM_BAD:
                         case -NFS4ERR_RECLAIM_CONFLICT:
                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
-                                break;
-                        case -NFS4ERR_STALE_CLIENTID:
-                                goto out_err;
+                                status = 0;
                 }
         }
-        up_write(&nfsi->rwsem);
-        return 0;
-out_err:
+out:
         up_write(&nfsi->rwsem);
         return status;
 }
@@ -918,6 +922,7 @@ restart:
                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
                                                 __func__, status);
                         case -ENOENT:
+                        case -ENOMEM:
                         case -ESTALE:
                                 /*
                                  * Open state on this file cannot be recovered
@@ -928,6 +933,9 @@ restart:
                                 /* Mark the file as being 'closed' */
                                 state->state = 0;
                                 break;
+                        case -NFS4ERR_ADMIN_REVOKED:
+                        case -NFS4ERR_STALE_STATEID:
+                        case -NFS4ERR_BAD_STATEID:
                         case -NFS4ERR_RECLAIM_BAD:
                         case -NFS4ERR_RECLAIM_CONFLICT:
                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);