Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:34180 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932171Ab2DTSgv (ORCPT ); Fri, 20 Apr 2012 14:36:51 -0400 From: Fred Isaman To: linux-nfs@vger.kernel.org Cc: Trond Myklebust Subject: [PATCH v2 19/28] NFS: prepare coalesce testing for directio Date: Fri, 20 Apr 2012 14:36:01 -0400 Message-Id: <1334946970-27470-20-git-send-email-iisaman@netapp.com> In-Reply-To: <1334946970-27470-1-git-send-email-iisaman@netapp.com> References: <1334946970-27470-1-git-send-email-iisaman@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: The coalesce code made assumptions that will no longer be true once non-page aligned io occurs. This introduces no change in current behavior, but allows for more general situations to come. Signed-off-by: Fred Isaman --- fs/nfs/nfs4filelayout.c | 12 ++++++++++++ fs/nfs/pagelist.c | 2 +- fs/nfs/pnfs.c | 8 ++++++++ 3 files changed, 21 insertions(+), 1 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 02d8170..e40523f 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -796,6 +796,16 @@ filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, { BUG_ON(pgio->pg_lseg != NULL); + if (req->wb_offset != req->wb_pgbase) { + /* + * Handling unaligned pages is difficult, because have to + * somehow split a req in two in certain cases in the + * pg.test code. Avoid this by just not using pnfs + * in this case. + */ + nfs_pageio_reset_read_mds(pgio); + return; + } pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, 0, @@ -815,6 +825,8 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, BUG_ON(pgio->pg_lseg != NULL); + if (req->wb_offset != req->wb_pgbase) + goto out_mds; pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, 0, diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index 5d01a16..b344946 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -280,7 +280,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev, return false; if (req->wb_context->state != prev->wb_context->state) return false; - if (req->wb_index != (prev->wb_index + 1)) + if (req_offset(req) != req_offset(prev) + prev->wb_bytes) return false; if (req->wb_pgbase != 0) return false; diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 4fa43e0..5e11557 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1082,6 +1082,10 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r { BUG_ON(pgio->pg_lseg != NULL); + if (req->wb_offset != req->wb_pgbase) { + nfs_pageio_reset_read_mds(pgio); + return; + } pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, req_offset(req), @@ -1100,6 +1104,10 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page * { BUG_ON(pgio->pg_lseg != NULL); + if (req->wb_offset != req->wb_pgbase) { + nfs_pageio_reset_write_mds(pgio); + return; + } pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, req_offset(req), -- 1.7.2.1