Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935178AbaGRNQr (ORCPT ); Fri, 18 Jul 2014 09:16:47 -0400 Received: from bband-dyn38.178-41-141.t-com.sk ([178.41.141.38]:17884 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S935119AbaGRNQo (ORCPT ); Fri, 18 Jul 2014 09:16:44 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Scott Mayhew , Trond Myklebust , Jiri Slaby Subject: [PATCH 3.12 038/170] nfs: Fix cache_validity check in nfs_write_pageuptodate() Date: Fri, 18 Jul 2014 14:10:43 +0200 Message-Id: X-Mailer: git-send-email 2.0.0 In-Reply-To: <48e8cad86bb1241c08bdaa80db022c25068ff8e0.1405685481.git.jslaby@suse.cz> References: <48e8cad86bb1241c08bdaa80db022c25068ff8e0.1405685481.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Scott Mayhew 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 18dd78c427513fb0f89365138be66e6ee8700d1b upstream. NFS_INO_INVALID_DATA cannot be ignored, even if we have a delegation. We're still having some problems with data corruption when multiple clients are appending to a file and those clients are being granted write delegations on open. To reproduce: Client A: vi /mnt/`hostname -s` while :; do echo "XXXXXXXXXXXXXXX" >>/mnt/file; sleep $(( $RANDOM % 5 )); done Client B: vi /mnt/`hostname -s` while :; do echo "YYYYYYYYYYYYYYY" >>/mnt/file; sleep $(( $RANDOM % 5 )); done What's happening is that in nfs_update_inode() we're recognizing that the file size has changed and we're setting NFS_INO_INVALID_DATA accordingly, but then we ignore the cache_validity flags in nfs_write_pageuptodate() because we have a delegation. As a result, in nfs_updatepage() we're extending the write to cover the full page even though we've not read in the data to begin with. Signed-off-by: Scott Mayhew Signed-off-by: Trond Myklebust Signed-off-by: Jiri Slaby --- fs/nfs/write.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index c6aa89f92558..3a1b1d1a27ce 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -913,12 +913,14 @@ static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) if (nfs_have_delegated_attributes(inode)) goto out; - if (nfsi->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE)) + if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) return false; smp_rmb(); if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) return false; out: + if (nfsi->cache_validity & NFS_INO_INVALID_DATA) + return false; return PageUptodate(page) != 0; } -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/