From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com ([134.134.136.65]:36145 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726863AbfFFBpV (ORCPT ); Wed, 5 Jun 2019 21:45:21 -0400 From: ira.weiny@intel.com Subject: [PATCH RFC 07/10] fs/ext4: Fail truncate if pages are GUP pinned Date: Wed, 5 Jun 2019 18:45:40 -0700 Message-Id: <20190606014544.8339-8-ira.weiny@intel.com> In-Reply-To: <20190606014544.8339-1-ira.weiny@intel.com> References: <20190606014544.8339-1-ira.weiny@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Dan Williams , Jan Kara , Theodore Ts'o , Jeff Layton , Dave Chinner Cc: Ira Weiny , Matthew Wilcox , linux-xfs@vger.kernel.org, Andrew Morton , John Hubbard , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org From: Ira Weiny If pages are actively gup pinned fail the truncate operation. Signed-off-by: Ira Weiny --- fs/ext4/inode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 75f543f384e4..1ded83ec08c0 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4250,6 +4250,9 @@ int ext4_break_layouts(struct inode *inode, loff_t offset, loff_t len) if (!page) return 0; + if (page_gup_pinned(page)) + return -ETXTBSY; + error = ___wait_var_event(&page->_refcount, atomic_read(&page->_refcount) == 1, TASK_INTERRUPTIBLE, 0, 0, -- 2.20.1