Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:58884 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753228Ab1BPSjO (ORCPT ); Wed, 16 Feb 2011 13:39:14 -0500 From: andros@netapp.com To: trond.myklebust@netapp.com Cc: linux-nfs@vger.kernel.org, Fred Isaman , Andy Adamson , Dean Hildebrand , Marc Eshel , Mike Sager , Oleg Drokin , Tao Guo , Tigran Mkrtchyan , Tigran Mkrtchyan , Andy Adamson , Benny Halevy Subject: [PATCH pNFS wave 3 Version 2 13/18] NFSv4.1: filelayout i/o helpers Date: Tue, 15 Feb 2011 03:38:58 -0500 Message-Id: <1297759143-2045-14-git-send-email-andros@netapp.com> In-Reply-To: <1297759143-2045-1-git-send-email-andros@netapp.com> References: <1297759143-2045-1-git-send-email-andros@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: Fred Isaman Prepare for filelayout_read_pagelist with helper functions that find the correct data server, filehandle, and offset. Signed-off-by: Andy Adamson Signed-off-by: Dean Hildebrand Signed-off-by: Fred Isaman Signed-off-by: Marc Eshel Signed-off-by: Mike Sager Signed-off-by: Oleg Drokin Signed-off-by: Tao Guo Signed-off-by: Tigran Mkrtchyan Signed-off-by: Tigran Mkrtchyan Signed-off-by: Andy Adamson Signed-off-by: Benny Halevy --- fs/nfs/nfs4filelayout.c | 34 ++++++++++++++++++++++ fs/nfs/nfs4filelayout.h | 7 ++++ fs/nfs/nfs4filelayoutdev.c | 67 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 108 insertions(+), 0 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 98e26e0..a2cde39 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -66,6 +66,40 @@ filelayout_clear_layoutdriver(struct nfs_server *nfss) return 0; } +static loff_t +filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, + loff_t offset) +{ + u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; + u64 tmp; + + offset -= flseg->pattern_offset; + tmp = offset; + do_div(tmp, stripe_width); + + return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit); +} + +/* This function is used by the layout driver to calculate the + * offset of the file on the dserver based on whether the + * layout type is STRIPE_DENSE or STRIPE_SPARSE + */ +static loff_t +filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) +{ + struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); + + switch (flseg->stripe_type) { + case STRIPE_SPARSE: + return offset; + + case STRIPE_DENSE: + return filelayout_get_dense_offset(flseg, offset); + } + + BUG(); +} + /* * filelayout_check_layout() * diff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h index bbf60dd..9fef76e 100644 --- a/fs/nfs/nfs4filelayout.h +++ b/fs/nfs/nfs4filelayout.h @@ -83,9 +83,16 @@ FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) generic_hdr); } +extern struct nfs_fh * +nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j); + extern void nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *); extern void print_ds(struct nfs4_pnfs_ds *ds); extern void print_deviceid(struct nfs4_deviceid *dev_id); +u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset); +u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j); +struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, + u32 ds_idx); extern struct nfs4_file_layout_dsaddr * nfs4_fl_find_get_deviceid(struct nfs_client *, struct nfs4_deviceid *dev_id); struct nfs4_file_layout_dsaddr * diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c index 8e21e65..e8496f3 100644 --- a/fs/nfs/nfs4filelayoutdev.c +++ b/fs/nfs/nfs4filelayoutdev.c @@ -512,3 +512,70 @@ nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id) return (d == NULL) ? NULL : container_of(d, struct nfs4_file_layout_dsaddr, deviceid); } + +/* + * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit + * Then: ((res + fsi) % dsaddr->stripe_count) + */ +u32 +nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset) +{ + struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); + u64 tmp; + + tmp = offset - flseg->pattern_offset; + do_div(tmp, flseg->stripe_unit); + tmp += flseg->first_stripe_index; + return do_div(tmp, flseg->dsaddr->stripe_count); +} + +u32 +nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j) +{ + return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j]; +} + +struct nfs_fh * +nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j) +{ + struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); + u32 i; + + if (flseg->stripe_type == STRIPE_SPARSE) { + if (flseg->num_fh == 1) + i = 0; + else if (flseg->num_fh == 0) + /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ + return NULL; + else + i = nfs4_fl_calc_ds_index(lseg, j); + } else + i = j; + return flseg->fh_array[i]; +} + +struct nfs4_pnfs_ds * +nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx) +{ + struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr; + struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx]; + + if (ds == NULL) { + printk(KERN_ERR "%s: No data server for offset index %d\n", + __func__, ds_idx); + return NULL; + } + + if (!ds->ds_clp) { + int err; + + err = nfs4_ds_connect(NFS_SERVER(lseg->pls_layout->plh_inode), + dsaddr->ds_list[ds_idx]); + if (err) { + printk(KERN_ERR "%s nfs4_ds_connect error %d\n", + __func__, err); + return NULL; + } + } + return ds; +} -- 1.7.2.3