Return-Path: Received: from mail-it0-f66.google.com ([209.85.214.66]:35943 "EHLO mail-it0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932421AbcGFWa5 (ORCPT ); Wed, 6 Jul 2016 18:30:57 -0400 Received: by mail-it0-f66.google.com with SMTP id h190so900945ith.3 for ; Wed, 06 Jul 2016 15:30:57 -0700 (PDT) From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v4 21/28] NFS: Remove redundant waits for O_DIRECT in fsync() and write_begin() Date: Wed, 6 Jul 2016 18:29:58 -0400 Message-Id: <1467844205-76852-22-git-send-email-trond.myklebust@primarydata.com> In-Reply-To: <1467844205-76852-21-git-send-email-trond.myklebust@primarydata.com> References: <1467844205-76852-1-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-2-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-3-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-4-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-5-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-6-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-7-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-8-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-9-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-10-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-11-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-12-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-13-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-14-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-15-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-16-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-17-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-18-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-19-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-20-git-send-email-trond.myklebust@primarydata.com> <1467844205-76852-21-git-send-email-trond.myklebust@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: We're now waiting immediately after taking the locks, so waiting in fsync() and write_begin() is either redundant or potentially subject to livelock (if not holding the lock). Signed-off-by: Trond Myklebust --- fs/nfs/file.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 9f8da9e1b23f..0e9b4a068f13 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -276,7 +276,6 @@ nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) trace_nfs_fsync_enter(inode); - inode_dio_wait(inode); do { ret = filemap_write_and_wait_range(inode->i_mapping, start, end); if (ret != 0) @@ -361,11 +360,6 @@ static int nfs_write_begin(struct file *file, struct address_space *mapping, file, mapping->host->i_ino, len, (long long) pos); start: - /* - * Wait for O_DIRECT to complete - */ - inode_dio_wait(mapping->host); - page = grab_cache_page_write_begin(mapping, index, flags); if (!page) return -ENOMEM; -- 2.7.4