NFS: Mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Warning level 2 was used: -Wimplicit-fallthrough=2

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/blocklayout/blocklayout.c

@@ -753,6 +753,7 @@ out:
 	case -ENODEV:
 		/* Our extent block devices are unavailable */
 		set_bit(NFS_LSEG_UNAVAILABLE, &lseg->pls_flags);
+		/* Fall through */
 	case 0:
 		return lseg;
 	default:

fs/nfs/nfs3acl.c

@@ -108,6 +108,7 @@ struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 		case -EPROTONOSUPPORT:
 			dprintk("NFS_V3_ACL extension not supported; disabling\n");
 			server->caps &= ~NFS_CAP_ACLS;
+			/* fall through */
 		case -ENOTSUPP:
 			status = -EOPNOTSUPP;
 		default:
@@ -229,6 +230,7 @@ static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
 			dprintk("NFS_V3_ACL SETACL RPC not supported"
 					"(will not retry)\n");
 			server->caps &= ~NFS_CAP_ACLS;
+			/* fall through */
 		case -ENOTSUPP:
 			status = -EOPNOTSUPP;
 	}

fs/nfs/nfs4file.c

@@ -149,6 +149,7 @@ static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
 		ret = nfs42_proc_llseek(filep, offset, whence);
 		if (ret != -ENOTSUPP)
 			return ret;
+		/* Fall through */
 	default:
 		return nfs_file_llseek(filep, offset, whence);
 	}

fs/nfs/nfs4idmap.c

@@ -506,6 +506,7 @@ static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
 	switch (token) {
 	case Opt_find_uid:
 		im->im_type = IDMAP_TYPE_USER;
+		/* Fall through */
 	case Opt_find_gid:
 		im->im_conv = IDMAP_CONV_NAMETOID;
 		ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
@@ -513,6 +514,7 @@ static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
 
 	case Opt_find_user:
 		im->im_type = IDMAP_TYPE_USER;
+		/* Fall through */
 	case Opt_find_group:
 		im->im_conv = IDMAP_CONV_IDTONAME;
 		ret = match_int(&substr, &im->im_id);

fs/nfs/nfs4proc.c

@@ -449,6 +449,7 @@ static int nfs4_do_handle_exception(struct nfs_server *server,
 						stateid);
 				goto wait_on_recovery;
 			}
+			/* Fall through */
 		case -NFS4ERR_OPENMODE:
 			if (inode) {
 				int err;
@@ -501,8 +502,10 @@ static int nfs4_do_handle_exception(struct nfs_server *server,
 				ret = -EBUSY;
 				break;
 			}
+			/* Fall through */
 		case -NFS4ERR_DELAY:
 			nfs_inc_server_stats(server, NFSIOS_DELAY);
+			/* Fall through */
 		case -NFS4ERR_GRACE:
 		case -NFS4ERR_LAYOUTTRYLATER:
 		case -NFS4ERR_RECALLCONFLICT:
@@ -1385,6 +1388,7 @@ static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
 	case NFS4_OPEN_CLAIM_PREVIOUS:
 		if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 			break;
+		/* Fall through */
 	default:
 		return 0;
 	}
@@ -2154,6 +2158,7 @@ int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
 		err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
 		if (err)
 			break;
+		/* Fall through */
 	case FMODE_READ:
 		err = nfs4_open_recover_helper(opendata, FMODE_READ);
 	}
@@ -2283,6 +2288,7 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
+		/* Fall through */
 	case NFS4_OPEN_CLAIM_FH:
 		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 	}
@@ -6267,11 +6273,13 @@ static void nfs4_locku_done(struct rpc_task *task, void *data)
 			if (nfs4_update_lock_stateid(calldata->lsp,
 					&calldata->res.stateid))
 				break;
+			/* Fall through */
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_EXPIRED:
 			nfs4_free_revoked_stateid(calldata->server,
 					&calldata->arg.stateid,
 					task->tk_msg.rpc_cred);
+			/* Fall through */
 		case -NFS4ERR_BAD_STATEID:
 		case -NFS4ERR_OLD_STATEID:
 		case -NFS4ERR_STALE_STATEID:

fs/nfs/nfs4state.c

@@ -1525,6 +1525,7 @@ restart:
 		default:
 			pr_err("NFS: %s: unhandled error %d\n",
 					__func__, status);
+			/* Fall through */
 		case -ENOMEM:
 		case -NFS4ERR_DENIED:
 		case -NFS4ERR_RECLAIM_BAD:
@@ -1597,6 +1598,7 @@ restart:
 			default:
 				printk(KERN_ERR "NFS: %s: unhandled error %d\n",
 					__func__, status);
+				/* Fall through */
 			case -ENOENT:
 			case -ENOMEM:
 			case -EACCES:
@@ -1608,6 +1610,7 @@ restart:
 				break;
 			case -EAGAIN:
 				ssleep(1);
+				/* Fall through */
 			case -NFS4ERR_ADMIN_REVOKED:
 			case -NFS4ERR_STALE_STATEID:
 			case -NFS4ERR_OLD_STATEID:
@@ -2190,9 +2193,11 @@ again:
 	case -ETIMEDOUT:
 		if (clnt->cl_softrtry)
 			break;
+		/* Fall through */
 	case -NFS4ERR_DELAY:
 	case -EAGAIN:
 		ssleep(1);
+		/* Fall through */
 	case -NFS4ERR_STALE_CLIENTID:
 		dprintk("NFS: %s after status %d, retrying\n",
 			__func__, status);
@@ -2204,6 +2209,7 @@ again:
 		}
 		if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
 			break;
+		/* Fall through */
 	case -NFS4ERR_CLID_INUSE:
 	case -NFS4ERR_WRONGSEC:
 		/* No point in retrying if we already used RPC_AUTH_UNIX */

fs/nfs/pagelist.c

@@ -561,6 +561,7 @@ static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr,
 	case FLUSH_COND_STABLE:
 		if (nfs_reqs_to_commit(cinfo))
 			break;
+		/* fall through */
 	default:
 		hdr->args.stable = NFS_FILE_SYNC;
 	}