From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.133]:50846 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756013AbeEaSHe (ORCPT ); Thu, 31 May 2018 14:07:34 -0400 From: Christoph Hellwig To: linux-xfs@vger.kernel.org Cc: Andreas Gruenbacher , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org Subject: [PATCH 2/3] fs: remove the buffer_unwritten check in page_seek_hole_data Date: Thu, 31 May 2018 20:07:23 +0200 Message-Id: <20180531180724.21573-3-hch@lst.de> In-Reply-To: <20180531180724.21573-1-hch@lst.de> References: <20180531180724.21573-1-hch@lst.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: We only call into this function through the iomap iterators, so we already know the buffer is unwritten. In addition to that we always require the uptodate flag that is ORed with the result anyway. Signed-off-by: Christoph Hellwig Reviewed-by: Andreas Gruenbacher Reviewed-by: Darrick J. Wong Reviewed-by: Dave Chinner --- fs/iomap.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/fs/iomap.c b/fs/iomap.c index f553a2d8a5fa..e93bd4eb7fa7 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -827,14 +827,9 @@ page_seek_hole_data(struct page *page, loff_t lastoff, int whence) continue; /* - * Unwritten extents that have data in the page cache covering - * them can be identified by the BH_Unwritten state flag. - * Pages with multiple buffers might have a mix of holes, data - * and unwritten extents - any buffer with valid data in it - * should have BH_Uptodate flag set on it. + * Any buffer with valid data in it should have BH_Uptodate set. */ - - if ((buffer_unwritten(bh) || buffer_uptodate(bh)) == seek_data) + if (buffer_uptodate(bh) == seek_data) return lastoff; lastoff = offset; @@ -846,8 +841,8 @@ page_seek_hole_data(struct page *page, loff_t lastoff, int whence) * Seek for SEEK_DATA / SEEK_HOLE in the page cache. * * Within unwritten extents, the page cache determines which parts are holes - * and which are data: unwritten and uptodate buffer heads count as data; - * everything else counts as a hole. + * and which are data: uptodate buffer heads count as data; everything else + * counts as a hole. * * Returns the resulting offset on successs, and -ENOENT otherwise. */ -- 2.17.0