From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Monakhov Subject: [PATCH 3/4] ext4: endless truncate due to nonlocked dio readers V2 Date: Tue, 4 Sep 2012 21:36:53 +0400 Message-ID: <1346780214-29845-3-git-send-email-dmonakhov@openvz.org> References: <1346780214-29845-1-git-send-email-dmonakhov@openvz.org> Cc: jack@suse.cz, Dmitry Monakhov To: linux-ext4@vger.kernel.org Return-path: Received: from mail-lb0-f174.google.com ([209.85.217.174]:52420 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752112Ab2IDRhB (ORCPT ); Tue, 4 Sep 2012 13:37:01 -0400 Received: by mail-lb0-f174.google.com with SMTP id gj3so3278468lbb.19 for ; Tue, 04 Sep 2012 10:37:00 -0700 (PDT) In-Reply-To: <1346780214-29845-1-git-send-email-dmonakhov@openvz.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: If we have enough aggressive DIO readers, truncate will wait forever inside inode_dio_wait(). It is reasonable to disable nonlock DIO read optimization during truncate. Signed-off-by: Dmitry Monakhov --- fs/ext4/inode.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 709ec5a..5a75908 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4354,7 +4354,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) if (attr->ia_valid & ATTR_SIZE) { if (attr->ia_size != i_size_read(inode)) truncate_setsize(inode, attr->ia_size); + ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); inode_dio_wait(inode); + ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); ext4_truncate(inode); } -- 1.7.7.6