From patchwork Mon Jun 6 15:59:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naohiro Aota X-Patchwork-Id: 12870620 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B95B8C43334 for ; Mon, 6 Jun 2022 15:59:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241195AbiFFP7g (ORCPT ); Mon, 6 Jun 2022 11:59:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241168AbiFFP7c (ORCPT ); Mon, 6 Jun 2022 11:59:32 -0400 Received: from esa3.hgst.iphmx.com (esa3.hgst.iphmx.com [216.71.153.141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B185353B72 for ; Mon, 6 Jun 2022 08:59:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1654531169; x=1686067169; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=dbuB6J0vUduoE7b++79sQRHRTJgy330EXtGiv+vyNBE=; b=eT3RnEO3xOfbAls/LZx+Krvk4RW3px41x3E983jqF5cI1ZuRvxDYRk8V ruoS3qLR+6etaFtJx42jAqjCTOclrDVtOsElhE5wsIWbKkCSN3EgW8fv+ pVC0Dl/gkLburxbvAxWQgLWcHUsUBGyDnPG0M9E+UCELe7g4l/xBns4MW rGsln9bnEjak5vjBwvfkBRodNnLy390FZKTvS5NfcgDks0FsCMjjFFQef 1Gt0X/dN0iEVcSh3hXzkNDQyb1iVByWm+YSJaWivnYO1Z4PCmKIU8mNsg nH+q5Q6f6g6wxtliRfUox29JDlivANMmX56TjgFzxwKaEa9bi3d6hMNxg Q==; X-IronPort-AV: E=Sophos;i="5.91,280,1647273600"; d="scan'208";a="207245101" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 06 Jun 2022 23:59:28 +0800 IronPort-SDR: fLL5j7MUcUQ5/kspTmu9uE2rWNdP9MUCwtlNDrb2jM/lXiwn9rwaNB804NgFRz+5SRDnObTYDX X9znKT5mR1VELTGLIq+RVJf3OzcHlkZVF8VAo1gNTtaW4Jvu9TzZ27U5DRJzk18GFVjRNNBnCT zVOJMwcginQAiauHqnODzAqVEg6pq8bynfYgT98eZ5Z0KPWOz0YGDOd8m46KmDxnE0me60d9wg KkUArCsozwobrCflb1ClaWi+A16Og3kHW7ib4vE1VHmyPIiWJiOBmk/qW+ZC3zGVIl+xaMKvk0 V01ZdKUTmp1iAh7RpdcVv8sK Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 06 Jun 2022 08:18:27 -0700 IronPort-SDR: RtC2FRyonPrakJC3tZcFIdGUkfYcSG8H166R/itYYRipfcTrNbV5f6sIhEYqWzuCsXQXAxv4Hk N/22y3etFPukm7fha+W06fyws3t3cxFZTK8qWN6hZ00UtEE7ZJKpcd70eOo1tmpRwnv1zLv5Ek u6e6k7GrZleW9zO9H5TJCQ0ila0CS3HwEJDav5NPqtWLP/gg6O9N9dKp3oMfyc4K+ci/qbbblP cZqT1A8Niq7bpqqRIII3OLQOSM0xj9qsSqA1eEwVsCUXPHgmVREqZtmrGhp0UeGaraUGxPfvzm yMs= WDCIronportException: Internal Received: from 5cg2012pz0.ad.shared (HELO naota-xeon.wdc.com) ([10.225.49.70]) by uls-op-cesaip01.wdc.com with ESMTP; 06 Jun 2022 08:59:29 -0700 From: Naohiro Aota To: linux-btrfs@vger.kernel.org Cc: Naohiro Aota Subject: [PATCH 1/2] btrfs: zoned: prevent allocation from previous data relocation BG Date: Tue, 7 Jun 2022 00:59:20 +0900 Message-Id: X-Mailer: git-send-email 2.35.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org After commit 5f0addf7b890 ("btrfs: zoned: use dedicated lock for data relocation"), we observe IO errors on e.g, btrfs/232 like below. [99909.031820][T4038707] WARNING: CPU: 3 PID: 4038707 at fs/btrfs/extent-tree.c:2381 btrfs_cross_ref_exist+0xfc/0x120 [btrfs] [99909.268769][T4038707] Call Trace: [99909.272105][T4038707] [99909.275093][T4038707] run_delalloc_nocow+0x7f1/0x11a0 [btrfs] [99909.280996][T4038707] ? test_range_bit+0x174/0x320 [btrfs] [99909.286622][T4038707] ? fallback_to_cow+0x980/0x980 [btrfs] [99909.292333][T4038707] ? find_lock_delalloc_range+0x33e/0x3e0 [btrfs] [99909.298825][T4038707] btrfs_run_delalloc_range+0x445/0x1320 [btrfs] [99909.305222][T4038707] ? test_range_bit+0x320/0x320 [btrfs] [99909.310844][T4038707] ? lock_downgrade+0x6a0/0x6a0 [99909.315732][T4038707] ? orc_find.part.0+0x1ed/0x300 [99909.320705][T4038707] ? __module_address.part.0+0x25/0x300 [99909.326280][T4038707] writepage_delalloc+0x159/0x310 [btrfs] [99909.883814][ C3] sd 10:0:1:0: [sde] tag#2620 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s [99909.893855][ C3] sd 10:0:1:0: [sde] tag#2620 Sense Key : Illegal Request [current] [99909.901819][ C3] sd 10:0:1:0: [sde] tag#2620 Add. Sense: Unaligned write command [99909.909525][ C3] sd 10:0:1:0: [sde] tag#2620 CDB: Write(16) 8a 00 00 00 00 00 02 f3 63 87 00 00 00 2c 00 00 [99909.919544][ C3] critical target error, dev sde, sector 396041272 op 0x1:(WRITE) flags 0x800 phys_seg 3 prio class 0 [99909.930329][ C3] BTRFS error (device dm-1): bdev /dev/mapper/dml_102_2 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0 The IO errors occur when we allocate a regular extent in a previous data relocation block group. On zoned btrfs, we use a dedicated block group to relocate a data extent. Thus, we allocate relocating data extents (pre-alloc) only from the dedicated block group and vice versa. Once the free space in the dedicated block group gets tight, a relocating extent may not fit into the block group. In that case, we need to switch the dedicated block group to the next one. Then, the previous one is now freed up for allocating a regular extent. The BG is already not enough to allocate the relocating extent, but there is still room to allocate a smaller extent. Now the problem happens. By allocating a regular extent while nocow IOs for the relocation is still on-going, we will issue WRITE IOs (for relocation) and ZONE APPEND IOs (for the regular writes) at the same time. That mixed IOs confuses the write pointer and arises the unaligned write errors. This commit introduces a new bit 'zoned_data_reloc_ongoing' to the btrfs_block_group. We set this bit before releasing the dedicated block group, and no extent are allocated from a block group having this bit set. This bit is similar to setting block_group->ro, but is different from it by allowing nocow writes to start. Once all the nocow IOs for relocation is done (hooked from btrfs_finish_ordered_io), we reset the bit to release the block group for further allocation. Fixes: c2707a255623 ("btrfs: zoned: add a dedicated data relocation block group") CC: stable@vger.kernel.org # 5.16+ Signed-off-by: Naohiro Aota --- fs/btrfs/block-group.h | 1 + fs/btrfs/extent-tree.c | 20 ++++++++++++++++++-- fs/btrfs/inode.c | 2 ++ fs/btrfs/zoned.c | 27 +++++++++++++++++++++++++++ fs/btrfs/zoned.h | 5 +++++ 5 files changed, 53 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index 3ac668ace50a..5787b3dd759c 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -104,6 +104,7 @@ struct btrfs_block_group { unsigned int relocating_repair:1; unsigned int chunk_item_inserted:1; unsigned int zone_is_active:1; + unsigned int zoned_data_reloc_ongoing; int disk_cache_state; diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index fb367689d9d2..abf7dc438409 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3832,7 +3832,7 @@ static int do_allocation_zoned(struct btrfs_block_group *block_group, block_group->start == fs_info->data_reloc_bg || fs_info->data_reloc_bg == 0); - if (block_group->ro) { + if (block_group->ro || block_group->zoned_data_reloc_ongoing) { ret = 1; goto out; } @@ -3894,8 +3894,24 @@ static int do_allocation_zoned(struct btrfs_block_group *block_group, out: if (ret && ffe_ctl->for_treelog) fs_info->treelog_bg = 0; - if (ret && ffe_ctl->for_data_reloc) + if (ret && ffe_ctl->for_data_reloc && + fs_info->data_reloc_bg == block_group->start) { + /* + * Do not allow further allocations from this block group. + * Compared to increasing the ->ro, setting the + * ->zoned_data_reloc_ongoing flag still allows nocow + * writers to come in. See btrfs_inc_nocow_writers(). + * + * We need to disable an allocation to avoid an allocation of + * regular (non relocation data) extent. With mixed of + * relocation extents and regular extents, we can dispatch WRITE + * commands (for relocation extents) and ZONE APPEND commands + * (for regular extents) at the same time to the same zone, + * which easily break the write pointer. + */ + block_group->zoned_data_reloc_ongoing = 1; fs_info->data_reloc_bg = 0; + } spin_unlock(&fs_info->relocation_bg_lock); spin_unlock(&fs_info->treelog_bg_lock); spin_unlock(&block_group->lock); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index f85503ccf106..0ab23bd1310a 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3216,6 +3216,8 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) ordered_extent->file_offset, ordered_extent->file_offset + logical_len); + btrfs_zoned_release_data_reloc_bg(fs_info, ordered_extent->disk_bytenr, + ordered_extent->disk_num_bytes); } else { BUG_ON(root == fs_info->tree_root); ret = insert_ordered_extent_file_extent(trans, ordered_extent); diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index c09b1b0208c4..4930ab566e2c 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -2140,3 +2140,30 @@ bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info) factor = div64_u64(used * 100, total); return factor >= fs_info->bg_reclaim_threshold; } + +void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical, + u64 length) +{ + struct btrfs_block_group *block_group; + + if (!btrfs_is_zoned(fs_info)) + return; + + block_group = btrfs_lookup_block_group(fs_info, logical); + /* It should be called on a previous data relocation block group. */ + ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)); + + spin_lock(&block_group->lock); + if (!block_group->zoned_data_reloc_ongoing) + goto out; + + /* All relocation extents are written. */ + if (block_group->start + block_group->alloc_offset == logical + length) { + /* Now, release this block group for further allocations. */ + block_group->zoned_data_reloc_ongoing = 0; + } + +out: + spin_unlock(&block_group->lock); + btrfs_put_block_group(block_group); +} diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h index bb1a189e11f9..6b2eec99162b 100644 --- a/fs/btrfs/zoned.h +++ b/fs/btrfs/zoned.h @@ -77,6 +77,8 @@ void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg, void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg); void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info); bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info); +void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical, + u64 length); #else /* CONFIG_BLK_DEV_ZONED */ static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, struct blk_zone *zone) @@ -243,6 +245,9 @@ static inline bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info) { return false; } + +static inline void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, + u64 logical, u64 length) { } #endif static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)