From patchwork Sun Apr 17 12:24:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 8862731 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B6AC8BF29F for ; Sun, 17 Apr 2016 12:25:02 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C047420172 for ; Sun, 17 Apr 2016 12:25:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDC4320166 for ; Sun, 17 Apr 2016 12:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752793AbcDQMY5 (ORCPT ); Sun, 17 Apr 2016 08:24:57 -0400 Received: from e28smtp04.in.ibm.com ([125.16.236.4]:50242 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751542AbcDQMY4 (ORCPT ); Sun, 17 Apr 2016 08:24:56 -0400 Received: from localhost by e28smtp04.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 17 Apr 2016 17:54:49 +0530 X-IBM-Helo: d28relay07.in.ibm.com X-IBM-MailFrom: chandan@linux.vnet.ibm.com X-IBM-RcptTo: linux-btrfs@vger.kernel.org Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay07.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u3HCOlmw31654054 for ; Sun, 17 Apr 2016 17:54:48 +0530 Received: from d28av01.in.ibm.com (localhost [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u3HHqqCm027475 for ; Sun, 17 Apr 2016 23:22:53 +0530 Received: from localhost.in.ibm.com ([9.77.205.82]) by d28av01.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u3HHqpeG027472; Sun, 17 Apr 2016 23:22:51 +0530 From: Chandan Rajendra To: linux-btrfs@vger.kernel.org Cc: Chandan Rajendra , dsterba@suse.cz, clm@fb.com, jbacik@fb.com, aneesh.kumar@linux.vnet.ibm.com, chandan@mykolab.com Subject: [PATCH] Btrfs: subpage-blocksize: btrfs_punch_hole: Fix uptodate blocks check Date: Sun, 17 Apr 2016 17:54:44 +0530 Message-Id: <1460895884-3524-1-git-send-email-chandan@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1460641107-13834-11-git-send-email-chandan@linux.vnet.ibm.com> References: <1460641107-13834-11-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 16041712-0013-0000-0000-00000BC80371 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@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 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 | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 65 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index e2f0968..8d35c47 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2321,6 +2321,8 @@ 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; @@ -2333,6 +2335,7 @@ 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; @@ -2429,11 +2432,43 @@ 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; 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) { + mutex_unlock(&inode->i_mutex); + 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); + } + mutex_unlock(&inode->i_mutex); + return -ENOMEM; + } + } + + lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, &cached_state); ordered = btrfs_lookup_first_ordered_extent(inode, lockend); @@ -2443,18 +2478,47 @@ 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; + if ((!ordered || (ordered->file_offset + ordered->len <= lockstart || ordered->file_offset > lockend)) && - !btrfs_page_exists_in_range(inode, lockstart, lockend)) { + (!(start_page && PagePrivate(start_page) && + test_page_blks_state(start_page, 1 << BLK_STATE_UPTODATE, + lockstart, + min(lockstart + PAGE_SIZE - 1, lockend), 0)) && + !(end_page && PagePrivate(end_page) && + test_page_blks_state(end_page, 1 << BLK_STATE_UPTODATE, + page_offset(end_page), lockend, 0)) && + !(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) {