From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 174D5C28CC0 for ; Wed, 29 May 2019 17:25:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F02A223F61 for ; Wed, 29 May 2019 17:25:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726240AbfE2RZD (ORCPT ); Wed, 29 May 2019 13:25:03 -0400 Received: from mx2.suse.de ([195.135.220.15]:51326 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725990AbfE2RZD (ORCPT ); Wed, 29 May 2019 13:25:03 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 7A1A2ACAA for ; Wed, 29 May 2019 17:25:02 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id E07EDDA85E; Wed, 29 May 2019 19:25:56 +0200 (CEST) From: David Sterba To: stable@vger.kernel.org Cc: David Sterba Subject: [PATCH for 4.19.x] Revert "btrfs: Honour FITRIM range constraints during free space trim" Date: Wed, 29 May 2019 19:25:44 +0200 Message-Id: <20190529172547.30563-2-dsterba@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190529112314.GY15290@suse.cz> References: <20190529112314.GY15290@suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This reverts commit 8b13bb911f0c0c77d41e5ddc41ad3c127c356b8a. There is currently no corresponding patch in master due to additional changes that would be significantly different from plain revert in the respective stable branch. The range argument was not handled correctly and could cause trim to overlap allocated areas or reach beyond the end of the device. The address space that fitrim normally operates on is in logical coordinates, while the discards are done on the physical device extents. This distinction cannot be made with the current ioctl interface and caused the confusion. The bug depends on the layout of block groups and does not always happen. The whole-fs trim (run by default by the fstrim tool) is not affected. Signed-off-by: David Sterba --- fs/btrfs/extent-tree.c | 25 ++++++------------------- 1 file changed, 6 insertions(+), 19 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 809c2c307c64..c0db7785cede 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10789,9 +10789,9 @@ int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, * held back allocations. */ static int btrfs_trim_free_extents(struct btrfs_device *device, - struct fstrim_range *range, u64 *trimmed) + u64 minlen, u64 *trimmed) { - u64 start = range->start, len = 0; + u64 start = 0, len = 0; int ret; *trimmed = 0; @@ -10834,8 +10834,8 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, if (!trans) up_read(&fs_info->commit_root_sem); - ret = find_free_dev_extent_start(trans, device, range->minlen, - start, &start, &len); + ret = find_free_dev_extent_start(trans, device, minlen, start, + &start, &len); if (trans) { up_read(&fs_info->commit_root_sem); btrfs_put_transaction(trans); @@ -10848,16 +10848,6 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, break; } - /* If we are out of the passed range break */ - if (start > range->start + range->len - 1) { - mutex_unlock(&fs_info->chunk_mutex); - ret = 0; - break; - } - - start = max(range->start, start); - len = min(range->len, len); - ret = btrfs_issue_discard(device->bdev, start, len, &bytes); mutex_unlock(&fs_info->chunk_mutex); @@ -10867,10 +10857,6 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, start += len; *trimmed += bytes; - /* We've trimmed enough */ - if (*trimmed >= range->len) - break; - if (fatal_signal_pending(current)) { ret = -ERESTARTSYS; break; @@ -10954,7 +10940,8 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range) mutex_lock(&fs_info->fs_devices->device_list_mutex); devices = &fs_info->fs_devices->devices; list_for_each_entry(device, devices, dev_list) { - ret = btrfs_trim_free_extents(device, range, &group_trimmed); + ret = btrfs_trim_free_extents(device, range->minlen, + &group_trimmed); if (ret) { dev_failed++; dev_ret = ret; -- 2.21.0