From patchwork Tue May 3 21:29:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9008611 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9D88A9F1D3 for ; Tue, 3 May 2016 21:29:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AC659200D9 for ; Tue, 3 May 2016 21:29:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99CDD2034E for ; Tue, 3 May 2016 21:29:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756679AbcECV3t (ORCPT ); Tue, 3 May 2016 17:29:49 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:46274 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756657AbcECV3s (ORCPT ); Tue, 3 May 2016 17:29:48 -0400 Received: from [83.175.99.196] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1axht4-0007Zz-Vg; Tue, 03 May 2016 21:29:47 +0000 From: Christoph Hellwig To: xfs@oss.sgi.com Cc: rpeterso@redhat.com, linux-fsdevel@vger.kernel.org Subject: [PATCH 14/14] xfs: kill xfs_zero_remaining_bytes Date: Tue, 3 May 2016 23:29:07 +0200 Message-Id: <1462310947-16132-15-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1462310947-16132-1-git-send-email-hch@lst.de> References: <1462310947-16132-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Instead punch the whole first, and the use the our zeroing helper to punch out the edge blocks. Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_bmap_util.c | 133 ++++++------------------------------------------- 1 file changed, 14 insertions(+), 119 deletions(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 5d030b0..0efabc1 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1096,101 +1096,6 @@ error1: /* Just cancel transaction */ return error; } -/* - * Zero file bytes between startoff and endoff inclusive. - * The iolock is held exclusive and no blocks are buffered. - * - * This function is used by xfs_free_file_space() to zero - * partial blocks when the range to free is not block aligned. - * When unreserving space with boundaries that are not block - * aligned we round up the start and round down the end - * boundaries and then use this function to zero the parts of - * the blocks that got dropped during the rounding. - */ -STATIC int -xfs_zero_remaining_bytes( - xfs_inode_t *ip, - xfs_off_t startoff, - xfs_off_t endoff) -{ - xfs_bmbt_irec_t imap; - xfs_fileoff_t offset_fsb; - xfs_off_t lastoffset; - xfs_off_t offset; - xfs_buf_t *bp; - xfs_mount_t *mp = ip->i_mount; - int nimap; - int error = 0; - - /* - * Avoid doing I/O beyond eof - it's not necessary - * since nothing can read beyond eof. The space will - * be zeroed when the file is extended anyway. - */ - if (startoff >= XFS_ISIZE(ip)) - return 0; - - if (endoff > XFS_ISIZE(ip)) - endoff = XFS_ISIZE(ip); - - for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { - uint lock_mode; - - offset_fsb = XFS_B_TO_FSBT(mp, offset); - nimap = 1; - - lock_mode = xfs_ilock_data_map_shared(ip); - error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); - xfs_iunlock(ip, lock_mode); - - if (error || nimap < 1) - break; - ASSERT(imap.br_blockcount >= 1); - ASSERT(imap.br_startoff == offset_fsb); - ASSERT(imap.br_startblock != DELAYSTARTBLOCK); - - if (imap.br_startblock == HOLESTARTBLOCK || - imap.br_state == XFS_EXT_UNWRITTEN) { - /* skip the entire extent */ - lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + - imap.br_blockcount) - 1; - continue; - } - - lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; - if (lastoffset > endoff) - lastoffset = endoff; - - /* DAX can just zero the backing device directly */ - if (IS_DAX(VFS_I(ip))) { - error = dax_zero_page_range(VFS_I(ip), offset, - lastoffset - offset + 1, - xfs_get_blocks_direct); - if (error) - return error; - continue; - } - - error = xfs_buf_read_uncached(XFS_IS_REALTIME_INODE(ip) ? - mp->m_rtdev_targp : mp->m_ddev_targp, - xfs_fsb_to_db(ip, imap.br_startblock), - BTOBB(mp->m_sb.sb_blocksize), - 0, &bp, NULL); - if (error) - return error; - - memset(bp->b_addr + - (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), - 0, lastoffset - offset + 1); - - error = xfs_bwrite(bp); - xfs_buf_relse(bp); - if (error) - return error; - } - return error; -} - static int xfs_unmap_extent( struct xfs_inode *ip, @@ -1316,7 +1221,7 @@ xfs_free_file_space( struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t startoffset_fsb; xfs_fileoff_t endoffset_fsb; - int done, error; + int done = 0, error; trace_xfs_free_file_space(ip); @@ -1348,31 +1253,21 @@ xfs_free_file_space( return error; } - if ((done = (endoffset_fsb <= startoffset_fsb))) - /* - * One contiguous piece to clear - */ - error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); - else { - /* - * Some full blocks, possibly two pieces to clear - */ - if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) - error = xfs_zero_remaining_bytes(ip, offset, - XFS_FSB_TO_B(mp, startoffset_fsb) - 1); - if (!error && - XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) - error = xfs_zero_remaining_bytes(ip, - XFS_FSB_TO_B(mp, endoffset_fsb), - offset + len - 1); - } - - while (!error && !done) { - error = xfs_unmap_extent(ip, startoffset_fsb, - endoffset_fsb - startoffset_fsb, &done); + if (endoffset_fsb > startoffset_fsb) { + while (!done) { + error = xfs_unmap_extent(ip, startoffset_fsb, + endoffset_fsb - startoffset_fsb, &done); + if (error) + return error; + } } - return error; + /* + * Now that we've unmap all full blocks we'll have to zero out any + * partial block at the beginning and/or end. xfs_zero_range is + * smart enough to skip any holes, including those we just created. + */ + return xfs_zero_range(ip, offset, len, NULL); } /*