Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:47535 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755003Ab0IISKi (ORCPT ); Thu, 9 Sep 2010 14:10:38 -0400 Received: from localhost.localdomain (surajit-lxp.hq.netapp.com [10.58.50.95] (may be forged)) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id o89IAW1R002948 for ; Thu, 9 Sep 2010 11:10:37 -0700 (PDT) From: Fred Isaman To: linux-nfs@vger.kernel.org Subject: [PATCH 06/13] RFC: nfs: set layout driver Date: Thu, 2 Sep 2010 14:00:12 -0400 Message-Id: <1283450419-5648-7-git-send-email-iisaman@netapp.com> In-Reply-To: <1283450419-5648-1-git-send-email-iisaman@netapp.com> References: <1283450419-5648-1-git-send-email-iisaman@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: The pNFS Team Put in the infrastructure that uses information returned from the server at mount to select a layout driver module. In this patch, a stub is used that always returns "no driver found". Signed-off-by: TBD - melding/reorganization of several patches --- fs/nfs/Makefile | 1 + fs/nfs/client.c | 4 ++ fs/nfs/pnfs.c | 78 +++++++++++++++++++++++++++++++++++++++++++++ fs/nfs/pnfs.h | 36 +++++++++++++++++++++ include/linux/nfs_fs.h | 1 + include/linux/nfs_fs_sb.h | 1 + 6 files changed, 121 insertions(+), 0 deletions(-) create mode 100644 fs/nfs/pnfs.c create mode 100644 fs/nfs/pnfs.h diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile index da7fda6..bb9e773 100644 --- a/fs/nfs/Makefile +++ b/fs/nfs/Makefile @@ -15,5 +15,6 @@ nfs-$(CONFIG_NFS_V4) += nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o \ delegation.o idmap.o \ callback.o callback_xdr.o callback_proc.o \ nfs4namespace.o +nfs-$(CONFIG_NFS_V4_1) += pnfs.o nfs-$(CONFIG_SYSCTL) += sysctl.o nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 4e7df2a..eed1212 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -48,6 +48,7 @@ #include "iostat.h" #include "internal.h" #include "fscache.h" +#include "pnfs.h" #define NFSDBG_FACILITY NFSDBG_CLIENT @@ -898,6 +899,8 @@ static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo * if (server->wsize > NFS_MAX_FILE_IO_SIZE) server->wsize = NFS_MAX_FILE_IO_SIZE; server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + set_pnfs_layoutdriver(server, fsinfo->layouttype); + server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); @@ -1017,6 +1020,7 @@ void nfs_free_server(struct nfs_server *server) { dprintk("--> nfs_free_server()\n"); + unset_pnfs_layoutdriver(server); spin_lock(&nfs_client_lock); list_del(&server->client_link); list_del(&server->master_link); diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c new file mode 100644 index 0000000..2e5dba1 --- /dev/null +++ b/fs/nfs/pnfs.c @@ -0,0 +1,78 @@ +/* + * pNFS functions to call and manage layout drivers. + * + * Copyright (c) 2002 [year of first publication] + * The Regents of the University of Michigan + * All Rights Reserved + * + * Dean Hildebrand + * + * Permission is granted to use, copy, create derivative works, and + * redistribute this software and such derivative works for any purpose, + * so long as the name of the University of Michigan is not used in + * any advertising or publicity pertaining to the use or distribution + * of this software without specific, written prior authorization. If + * the above copyright notice or any other identification of the + * University of Michigan is included in any copy of any portion of + * this software, then the disclaimer below must also be included. + * + * This software is provided as is, without representation or warranty + * of any kind either express or implied, including without limitation + * the implied warranties of merchantability, fitness for a particular + * purpose, or noninfringement. The Regents of the University of + * Michigan shall not be liable for any damages, including special, + * indirect, incidental, or consequential damages, with respect to any + * claim arising out of or in connection with the use of the software, + * even if it has been or is hereafter advised of the possibility of + * such damages. + */ + +#include +#include "pnfs.h" + +#define NFSDBG_FACILITY NFSDBG_PNFS + +/* STUB that returns the equivalent of "no module found" */ +static struct pnfs_layoutdriver_type * +find_pnfs_driver(u32 id) { + return NULL; +} + +/* Unitialize a mountpoint in a layout driver */ +void +unset_pnfs_layoutdriver(struct nfs_server *nfss) +{ + nfss->pnfs_curr_ld = NULL; +} + +/* + * Try to set the server's pnfs module to the pnfs layout type specified by id. + * Currently only one pNFS layout driver per filesystem is supported. + * + * @id layout type. Zero (illegal layout type) indicates pNFS not in use. + */ +void +set_pnfs_layoutdriver(struct nfs_server *server, u32 id) +{ + struct pnfs_layoutdriver_type *ld_type = NULL; + + if (id == 0) + goto out_no_driver; + ld_type = find_pnfs_driver(id); + if (!ld_type) { + request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); + ld_type = find_pnfs_driver(id); + if (!ld_type) { + dprintk("%s: No pNFS module found for %u.\n", + __func__, id); + goto out_no_driver; + } + } + server->pnfs_curr_ld = ld_type; + dprintk("%s: pNFS module for %u set\n", __func__, id); + return; + +out_no_driver: + dprintk("%s: Using NFSv4 I/O\n", __func__); + server->pnfs_curr_ld = NULL; +} diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h new file mode 100644 index 0000000..3281fbf --- /dev/null +++ b/fs/nfs/pnfs.h @@ -0,0 +1,36 @@ +/* + * pNFS client data structures. + * + * Copyright (c) 2002 The Regents of the University of Michigan. + * All rights reserved. + * + * Dean Hildebrand + */ + +#ifndef FS_NFS_PNFS_H +#define FS_NFS_PNFS_H + +#ifdef CONFIG_NFS_V4_1 + +#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" + +/* Per-layout driver specific registration structure */ +struct pnfs_layoutdriver_type { +}; + +void set_pnfs_layoutdriver(struct nfs_server *, u32 id); +void unset_pnfs_layoutdriver(struct nfs_server *); + +#else /* CONFIG_NFS_V4_1 */ + +static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) +{ +} + +static inline void unset_pnfs_layoutdriver(struct nfs_server *s) +{ +} + +#endif /* CONFIG_NFS_V4_1 */ + +#endif /* FS_NFS_PNFS_H */ diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 508f8cf..042c2bd 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -613,6 +613,7 @@ extern void * nfs_root_data(void); #define NFSDBG_CLIENT 0x0200 #define NFSDBG_MOUNT 0x0400 #define NFSDBG_FSCACHE 0x0800 +#define NFSDBG_PNFS 0x1000 #define NFSDBG_ALL 0xFFFF #ifdef __KERNEL__ diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index c82ee7c..29a821d 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -144,6 +144,7 @@ struct nfs_server { u32 acl_bitmask; /* V4 bitmask representing the ACEs that are supported on this filesystem */ + struct pnfs_layoutdriver_type *pnfs_curr_ld; /* Active layout driver */ #endif void (*destroy)(struct nfs_server *); -- 1.7.2.1