Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-pd0-f179.google.com ([209.85.192.179]:59489 "EHLO mail-pd0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754742AbbAGA3p (ORCPT ); Tue, 6 Jan 2015 19:29:45 -0500 Received: by mail-pd0-f179.google.com with SMTP id fp1so1013750pdb.10 for ; Tue, 06 Jan 2015 16:29:45 -0800 (PST) From: Tom Haynes To: Trond Myklebust Cc: Linux NFS Mailing list Subject: [PATCH v3 32/49] nfs: handle overlapping reqs in lock_and_join Date: Tue, 6 Jan 2015 16:28:37 -0800 Message-Id: <1420590534-84063-33-git-send-email-loghyr@primarydata.com> In-Reply-To: <1420590534-84063-1-git-send-email-loghyr@primarydata.com> References: <1420590534-84063-1-git-send-email-loghyr@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Weston Andros Adamson This is needed for mirrored DS support, where multuple requests cover the same range. Signed-off-by: Weston Andros Adamson --- fs/nfs/write.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index ab392af..a6eadac 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -473,13 +473,18 @@ try_again: do { /* * Subrequests are always contiguous, non overlapping - * and in order. If not, it's a programming error. + * and in order - but may be repeated (mirrored writes). */ - WARN_ON_ONCE(subreq->wb_offset != - (head->wb_offset + total_bytes)); - - /* keep track of how many bytes this group covers */ - total_bytes += subreq->wb_bytes; + if (subreq->wb_offset == (head->wb_offset + total_bytes)) { + /* keep track of how many bytes this group covers */ + total_bytes += subreq->wb_bytes; + } else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset || + ((subreq->wb_offset + subreq->wb_bytes) > + (head->wb_offset + total_bytes)))) { + nfs_page_group_unlock(head); + spin_unlock(&inode->i_lock); + return ERR_PTR(-EIO); + } if (!nfs_lock_request(subreq)) { /* releases page group bit lock and -- 1.9.3