Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:33152 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754405Ab0HMVcg (ORCPT ); Fri, 13 Aug 2010 17:32:36 -0400 From: andros@netapp.com To: bhalevy@panasas.com Cc: linux-nfs@vger.kernel.org, Andy Adamson Subject: [PATCH 37/50] pnfs_submit: filelayout read Date: Fri, 13 Aug 2010 17:31:49 -0400 Message-Id: <1281735122-1496-38-git-send-email-andros@netapp.com> In-Reply-To: <1281735122-1496-37-git-send-email-andros@netapp.com> References: <1281735122-1496-1-git-send-email-andros@netapp.com> <1281735122-1496-2-git-send-email-andros@netapp.com> <1281735122-1496-3-git-send-email-andros@netapp.com> <1281735122-1496-4-git-send-email-andros@netapp.com> <1281735122-1496-5-git-send-email-andros@netapp.com> <1281735122-1496-6-git-send-email-andros@netapp.com> <1281735122-1496-7-git-send-email-andros@netapp.com> <1281735122-1496-8-git-send-email-andros@netapp.com> <1281735122-1496-9-git-send-email-andros@netapp.com> <1281735122-1496-10-git-send-email-andros@netapp.com> <1281735122-1496-11-git-send-email-andros@netapp.com> <1281735122-1496-12-git-send-email-andros@netapp.com> <1281735122-1496-13-git-send-email-andros@netapp.com> <1281735122-1496-14-git-send-email-andros@netapp.com> <1281735122-1496-15-git-send-email-andros@netapp.com> <1281735122-1496-16-git-send-email-andros@netapp.com> <1281735122-1496-17-git-send-email-andros@netapp.com> <1281735122-1496-18-git-send-email-andros@netapp.com> <1281735122-1496-19-git-send-email-andros@netapp.com> <1281735122-1496-20-git-send-email-andros@netapp.com> <1281735122-1496-21-git-send-email-andros@netapp.com> <1281735122-1496-22-git-send-email-andros@netapp.com> <1281735122-1496-23-git-send-email-andros@netapp.com> <1281735122-1496-24-git-send-email-andros@netapp.com> <1281735122-1496-25-git-send-email-andros@netapp.com> <1281735122-1496-26-git-send-email-andros@netapp.com> <1281735122-1496-27-git-send-email-andros@netapp.com> <1281735122-1496-28-git-send-email-andros@netapp.com> <1281735122-1496-29-git-send-email-andros@netapp.com> <1281735122-1496-30-git-send-email-andros@netapp.com> <1281735122-1496-31-git-send-email-andros@netapp.com> <1281735122-1496-32-git-send-email-andros@netapp.com> <1281735122-1496-33-git-send-email-andros@netapp.com> <1281735122-1496-34-git-send-email-andros@netapp.com> <1281735122-1496-35-git-send-email-andros@netapp.com> <1281735122-1496-36-git-send-email-andros@netapp.com> <1281735122-1496-37-git-send-email-andros@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: The pNFS Team Signed-off-by: Andy Adamson --- fs/nfs/nfs4filelayout.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 88 insertions(+), 0 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index d1c0d35..c9251ca 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -124,6 +124,93 @@ filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) } /* + * Call ops for the async read/write cases + * In the case of dense layouts, the offset needs to be reset to its + * original value. + */ +static void filelayout_read_call_done(struct rpc_task *task, void *data) +{ + struct nfs_read_data *rdata = (struct nfs_read_data *)data; + + if (rdata->fldata.orig_offset) { + dprintk("%s new off %llu orig offset %llu\n", __func__, + rdata->args.offset, rdata->fldata.orig_offset); + rdata->args.offset = rdata->fldata.orig_offset; + } + + /* Note this may cause RPC to be resent */ + rdata->pdata.call_ops->rpc_call_done(task, data); +} + +static void filelayout_read_release(void *data) +{ + struct nfs_read_data *rdata = (struct nfs_read_data *)data; + + put_lseg(rdata->pdata.lseg); + rdata->pdata.lseg = NULL; + rdata->pdata.call_ops->rpc_release(data); +} + +struct rpc_call_ops filelayout_read_call_ops = { + .rpc_call_prepare = nfs_read_prepare, + .rpc_call_done = filelayout_read_call_done, + .rpc_release = filelayout_read_release, +}; + +/* Perform sync or async reads. + * + * An optimization for the NFS file layout driver + * allows the original read/write data structs to be passed in the + * last argument. + * + * TODO: join with write_pagelist? + */ +static enum pnfs_try_status +filelayout_read_pagelist(struct nfs_read_data *data, unsigned nr_pages) +{ + struct pnfs_layout_segment *lseg = data->pdata.lseg; + struct nfs4_pnfs_ds *ds; + loff_t offset = data->args.offset; + u32 idx; + struct nfs_fh *fh; + + dprintk("--> %s ino %lu nr_pages %d pgbase %u req %Zu@%llu\n", + __func__, data->inode->i_ino, nr_pages, + data->args.pgbase, (size_t)data->args.count, offset); + + /* Retrieve the correct rpc_client for the byte range */ + idx = nfs4_fl_calc_ds_index(lseg, offset); + ds = nfs4_fl_prepare_ds(lseg, idx); + if (!ds) { + printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); + return PNFS_NOT_ATTEMPTED; + } + dprintk("%s USE DS:ip %x %s\n", __func__, + htonl(ds->ds_ip_addr), ds->r_addr); + + /* just try the first data server for the index..*/ + data->fldata.ds_nfs_client = ds->ds_clp; + fh = nfs4_fl_select_ds_fh(lseg, offset); + if (fh) + data->args.fh = fh; + + /* + * Now get the file offset on the dserver + * Set the read offset to this offset, and + * save the original offset in orig_offset + * In the case of aync reads, the offset will be reset in the + * call_ops->rpc_call_done() routine. + */ + data->args.offset = filelayout_get_dserver_offset(lseg, offset); + data->fldata.orig_offset = offset; + + /* Perform an asynchronous read */ + nfs_initiate_read(data, ds->ds_clp->cl_rpcclient, + &filelayout_read_call_ops); + return PNFS_ATTEMPTED; +} + +/* * Create a filelayout layout structure and return it. The pNFS client * will use the pnfs_layout_type type to refer to the layout for this * inode from now on. @@ -377,6 +464,7 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, } struct layoutdriver_io_operations filelayout_io_operations = { + .read_pagelist = filelayout_read_pagelist, .alloc_layout = filelayout_alloc_layout, .free_layout = filelayout_free_layout, .alloc_lseg = filelayout_alloc_lseg, -- 1.6.2.5