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Violators will be prosecuted; Thu, 4 Feb 2016 16:47:48 +1000 X-IBM-Helo: d23dlp03.au.ibm.com X-IBM-MailFrom: chandan@linux.vnet.ibm.com X-IBM-RcptTo: linux-btrfs@vger.kernel.org Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 0AB053578054 for ; Thu, 4 Feb 2016 17:47:48 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u146ldrg45285606 for ; Thu, 4 Feb 2016 17:47:48 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u146lEYT015237 for ; Thu, 4 Feb 2016 17:47:15 +1100 Received: from localhost.in.ibm.com ([9.124.125.198]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u146krRH013893; Thu, 4 Feb 2016 17:47:13 +1100 From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, bo.li.liu@oracle.com, dsterba@suse.cz Cc: Chandan Rajendra , aneesh.kumar@linux.vnet.ibm.com, linux-btrfs@vger.kernel.org, chandan@mykolab.com Subject: [PATCH V14 10/15] Btrfs: subpagesize-blocksize: btrfs_punch_hole: Fix uptodate blocks check Date: Thu, 4 Feb 2016 12:16:17 +0530 Message-Id: <1454568382-2020-11-git-send-email-chandan@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1454568382-2020-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1454568382-2020-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16020406-0017-0000-0000-000002BD8C4A Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.4 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 subpagesize-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 b8b0eda..7f5e64c 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2323,6 +2323,8 @@ 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; @@ -2335,6 +2337,7 @@ 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; @@ -2431,11 +2434,43 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) goto out_only_mutex; } + start_index = lockstart >> PAGE_CACHE_SHIFT; + end_index = lockend >> PAGE_CACHE_SHIFT; + + same_page = lockstart >> PAGE_CACHE_SHIFT + == lockend >> PAGE_CACHE_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_CACHE_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_CACHE_SIZE - 1))) { + end_page = find_or_create_page(mapping, end_index, + GFP_NOFS); + if (!end_page) { + if (start_page) { + unlock_page(start_page); + page_cache_release(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); @@ -2445,18 +2480,47 @@ 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_CACHE_SIZE) + - round_down(lockstart, PAGE_CACHE_SIZE); + nr_pages >>= PAGE_CACHE_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_CACHE_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_CACHE_SIZE), + round_down(lockend, PAGE_CACHE_SIZE) - 1)))) { if (ordered) btrfs_put_ordered_extent(ordered); + if (end_page) { + unlock_page(end_page); + page_cache_release(end_page); + } + if (start_page) { + unlock_page(start_page); + page_cache_release(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); + page_cache_release(end_page); + } + if (start_page) { + unlock_page(start_page); + page_cache_release(start_page); + } ret = btrfs_wait_ordered_range(inode, lockstart, lockend - lockstart + 1); if (ret) {