Return-Path: Received: from int-mailstore01.merit.edu ([207.75.116.232]:60638 "EHLO int-mailstore01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754498Ab1FLXoI (ORCPT ); Sun, 12 Jun 2011 19:44:08 -0400 Message-Id: In-Reply-To: References: Date: Sun, 12 Jun 2011 19:44:05 -0400 Subject: [PATCH 08/34] pnfsblock: blocklayout stub From: Jim Rees To: linux-nfs@vger.kernel.org Cc: peter honeyman Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: Fred Isaman Adds the minimal structure for a pnfs block layout driver, with all function pointers aimed at stubs. [pnfsblock: SQUASHME: port block layout code] Signed-off-by: Peng Tao [pnfsblock: SQUASHME: adjust to API change] Signed-off-by: Fred Isaman [pnfs: move pnfs_layout_type inline in nfs_inode] Signed-off-by: Benny Halevy [blocklayout: encode_layoutcommit implementation] Signed-off-by: Boaz Harrosh Signed-off-by: Benny Halevy --- fs/nfs/blocklayout/Makefile | 4 +- fs/nfs/blocklayout/blocklayout.c | 166 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 168 insertions(+), 2 deletions(-) create mode 100644 fs/nfs/blocklayout/blocklayout.c diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile index f214c1c..6bf49cd 100644 --- a/fs/nfs/blocklayout/Makefile +++ b/fs/nfs/blocklayout/Makefile @@ -1,5 +1,5 @@ # # Makefile for the pNFS block layout driver kernel module # -obj-$(CONFIG_PNFS_BLOCK) += -blocklayoutdriver-objs := +obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o +blocklayoutdriver-objs := blocklayout.o diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c new file mode 100644 index 0000000..2e0d41a --- /dev/null +++ b/fs/nfs/blocklayout/blocklayout.c @@ -0,0 +1,166 @@ +/* + * linux/fs/nfs/blocklayout/blocklayout.c + * + * Module for the NFSv4.1 pNFS block layout driver. + * + * Copyright (c) 2006 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson + * Fred Isaman + * + * 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 from the + * university of michigan as to its fitness for any purpose, and without + * warranty by the university of michigan of any kind, either express + * or implied, including without limitation the implied warranties of + * merchantability and fitness for a particular purpose. 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 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 + +#include "../pnfs.h" + +#define NFSDBG_FACILITY NFSDBG_PNFS_LD + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Andy Adamson "); +MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); + +static enum pnfs_try_status +bl_read_pagelist(struct nfs_read_data *rdata) +{ + return PNFS_NOT_ATTEMPTED; +} + +static enum pnfs_try_status +bl_write_pagelist(struct nfs_write_data *wdata, + int sync) +{ + return PNFS_NOT_ATTEMPTED; +} + +static void +bl_free_layout_hdr(struct pnfs_layout_hdr *lo) +{ +} + +static struct pnfs_layout_hdr * +bl_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) +{ + return NULL; +} + +static void +bl_free_lseg(struct pnfs_layout_segment *lseg) +{ +} + +static struct pnfs_layout_segment * +bl_alloc_lseg(struct pnfs_layout_hdr *lo, + struct nfs4_layoutget_res *lgr, gfp_t gfp_flags) +{ + return NULL; +} + +static void +bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr, + const struct nfs4_layoutcommit_args *arg) +{ +} + +static void +bl_cleanup_layoutcommit(struct pnfs_layout_hdr *lo, + struct nfs4_layoutcommit_data *lcdata) +{ +} + +static int +bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) +{ + dprintk("%s enter\n", __func__); + return 0; +} + +static int +bl_clear_layoutdriver(struct nfs_server *server) +{ + dprintk("%s enter\n", __func__); + return 0; +} + +static int +bl_write_begin(struct pnfs_layout_segment *lseg, struct page *page, loff_t pos, + unsigned count, struct pnfs_fsdata *fsdata) +{ + return 0; +} + +static int +bl_write_end(struct inode *inode, struct page *page, loff_t pos, + unsigned count, unsigned copied, struct pnfs_layout_segment *lseg) +{ + return 0; +} + +/* Return any memory allocated to fsdata->private, and take advantage + * of no page locks to mark pages noted in write_begin as needing + * initialization. + */ +static void +bl_write_end_cleanup(struct file *filp, struct pnfs_fsdata *fsdata) +{ +} + +static struct pnfs_layoutdriver_type blocklayout_type = { + .id = LAYOUT_BLOCK_VOLUME, + .name = "LAYOUT_BLOCK_VOLUME", + .read_pagelist = bl_read_pagelist, + .write_pagelist = bl_write_pagelist, + .write_begin = bl_write_begin, + .write_end = bl_write_end, + .write_end_cleanup = bl_write_end_cleanup, + .alloc_layout_hdr = bl_alloc_layout_hdr, + .free_layout_hdr = bl_free_layout_hdr, + .alloc_lseg = bl_alloc_lseg, + .free_lseg = bl_free_lseg, + .encode_layoutcommit = bl_encode_layoutcommit, + .cleanup_layoutcommit = bl_cleanup_layoutcommit, + .set_layoutdriver = bl_set_layoutdriver, + .clear_layoutdriver = bl_clear_layoutdriver, + .pg_test = pnfs_generic_pg_test, +}; + +static int __init nfs4blocklayout_init(void) +{ + int ret; + + dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); + + ret = pnfs_register_layoutdriver(&blocklayout_type); + return ret; +} + +static void __exit nfs4blocklayout_exit(void) +{ + dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", + __func__); + + pnfs_unregister_layoutdriver(&blocklayout_type); +} + +module_init(nfs4blocklayout_init); +module_exit(nfs4blocklayout_exit); -- 1.7.4.1