From patchwork Mon Jul 4 04:34:30 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 9211595 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5F73760467 for ; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 54C382862D for ; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 495752863D; Mon, 4 Jul 2016 04:35:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BEF522862D for ; Mon, 4 Jul 2016 04:35:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752762AbcGDEfo (ORCPT ); Mon, 4 Jul 2016 00:35:44 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:27366 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752706AbcGDEfm (ORCPT ); Mon, 4 Jul 2016 00:35:42 -0400 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u644Xe3w128364 for ; Mon, 4 Jul 2016 00:35:41 -0400 Received: from e18.ny.us.ibm.com (e18.ny.us.ibm.com [129.33.205.208]) by mx0a-001b2d01.pphosted.com with ESMTP id 23xa4bpepx-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 04 Jul 2016 00:35:41 -0400 Received: from localhost by e18.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 4 Jul 2016 00:35:37 -0400 X-IBM-Helo: d01dlp01.pok.ibm.com X-IBM-MailFrom: chandan@linux.vnet.ibm.com Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id 0601838C8039; Mon, 4 Jul 2016 00:35:37 -0400 (EDT) Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u644ZaUN58327290; Mon, 4 Jul 2016 04:35:36 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id ADD6FAC058; Mon, 4 Jul 2016 00:35:36 -0400 (EDT) Received: from localhost.in.ibm.com (unknown [9.124.208.86]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP id BA5FEAC040; Mon, 4 Jul 2016 00:35:34 -0400 (EDT) From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, dsterba@suse.com Cc: Chandan Rajendra , linux-btrfs@vger.kernel.org Subject: [PATCH V20 10/19] Btrfs: subpage-blocksize: btrfs_punch_hole: Fix uptodate blocks check Date: Mon, 4 Jul 2016 10:04:30 +0530 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1467606879-14181-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1467606879-14181-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16070404-0044-0000-0000-0000009097BA X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16070404-0045-0000-0000-000004A6AA24 Message-Id: <1467606879-14181-11-git-send-email-chandan@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-07-04_02:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1607040043 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In case of subpage-blocksize, the file blocks to be punched may map only part of a page. For file blocks inside such pages, we need to check for the presence of BLK_STATE_UPTODATE flag. Signed-off-by: Chandan Rajendra --- fs/btrfs/file.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 88 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 38f5e8e..89ded7b 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2335,6 +2335,8 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) struct btrfs_path *path; struct btrfs_block_rsv *rsv; struct btrfs_trans_handle *trans; + struct address_space *mapping = inode->i_mapping; + pgoff_t start_index, end_index; u64 lockstart; u64 lockend; u64 tail_start; @@ -2347,6 +2349,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) int err = 0; unsigned int rsv_count; bool same_block; + bool same_page; bool no_holes = btrfs_fs_incompat(root->fs_info, NO_HOLES); u64 ino_size; bool truncated_block = false; @@ -2443,11 +2446,45 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) goto out_only_mutex; } + start_index = lockstart >> PAGE_SHIFT; + end_index = lockend >> PAGE_SHIFT; + + same_page = lockstart >> PAGE_SHIFT + == lockend >> PAGE_SHIFT; + while (1) { struct btrfs_ordered_extent *ordered; + struct page *start_page = NULL; + struct page *end_page = NULL; + u64 nr_pages; + int start_page_blks_uptodate; + int end_page_blks_uptodate; truncate_pagecache_range(inode, lockstart, lockend); + if (lockstart & (PAGE_SIZE - 1)) { + start_page = find_or_create_page(mapping, start_index, + GFP_NOFS); + if (!start_page) { + inode_unlock(inode); + return -ENOMEM; + } + } + + if (!same_page && ((lockend + 1) & (PAGE_SIZE - 1))) { + end_page = find_or_create_page(mapping, end_index, + GFP_NOFS); + if (!end_page) { + if (start_page) { + unlock_page(start_page); + put_page(start_page); + } + inode_unlock(inode); + return -ENOMEM; + } + } + + lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, &cached_state); ordered = btrfs_lookup_first_ordered_extent(inode, lockend); @@ -2457,18 +2494,68 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) * and nobody raced in and read a page in this range, if we did * we need to try again. */ + nr_pages = round_up(lockend, PAGE_SIZE) + - round_down(lockstart, PAGE_SIZE); + nr_pages >>= PAGE_SHIFT; + + start_page_blks_uptodate = 0; + end_page_blks_uptodate = 0; + if (root->sectorsize < PAGE_SIZE) { + u64 page_end; + + page_end = round_down(lockstart, PAGE_SIZE) + + PAGE_SIZE - 1; + page_end = min(page_end, lockend); + if (start_page + && PagePrivate(start_page) + && test_page_blks_state(start_page, 1 << BLK_STATE_UPTODATE, + lockstart, page_end, 0)) + start_page_blks_uptodate = 1; + if (end_page + && PagePrivate(end_page) + && test_page_blks_state(end_page, 1 << BLK_STATE_UPTODATE, + page_offset(end_page), lockend, 0)) + end_page_blks_uptodate = 1; + } else { + if (start_page && PagePrivate(start_page) + && PageUptodate(start_page)) + start_page_blks_uptodate = 1; + if (end_page && PagePrivate(end_page) + && PageUptodate(end_page)) + end_page_blks_uptodate = 1; + } + if ((!ordered || (ordered->file_offset + ordered->len <= lockstart || ordered->file_offset > lockend)) && - !btrfs_page_exists_in_range(inode, lockstart, lockend)) { + (!start_page_blks_uptodate && !end_page_blks_uptodate && + !(nr_pages > 2 && btrfs_page_exists_in_range(inode, + round_up(lockstart, PAGE_SIZE), + round_down(lockend, PAGE_SIZE) - 1)))) { if (ordered) btrfs_put_ordered_extent(ordered); + if (end_page) { + unlock_page(end_page); + put_page(end_page); + } + if (start_page) { + unlock_page(start_page); + put_page(start_page); + } break; } if (ordered) btrfs_put_ordered_extent(ordered); unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, &cached_state, GFP_NOFS); + if (end_page) { + unlock_page(end_page); + put_page(end_page); + } + if (start_page) { + unlock_page(start_page); + put_page(start_page); + } ret = btrfs_wait_ordered_range(inode, lockstart, lockend - lockstart + 1); if (ret) {