From patchwork Thu Oct 1 18:36:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naohiro Aota X-Patchwork-Id: 11812297 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ECB11139F for ; Thu, 1 Oct 2020 18:39:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CED0E20796 for ; Thu, 1 Oct 2020 18:39:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="cT+KNSt6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733153AbgJASjU (ORCPT ); Thu, 1 Oct 2020 14:39:20 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:24680 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730079AbgJASjH (ORCPT ); Thu, 1 Oct 2020 14:39:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1601577547; x=1633113547; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=shVFtZnTpmLC/FMiePjkuEnS2T84Svac1gaMW/ga3nw=; b=cT+KNSt6nETolEv3i9rNfwMZShwekdjBaQB2upJhVwv0IKCDRXvegVYT 6WuXA49Pdj0tP0Zn9KITN6Zzx9mcooACYXZC5FnjgF+FgKLtK0ODCEsWu T5mC45dwfyF8f9n1uVrKWru7L5tQ+uAH7duSZbV9SfPoBgXazs7kYK9hJ G/IG9IkF2/++Z9LI4vyNh8wA26JYvZF45JtV2CR7LgWEkpnr5j3Gtlqx+ k/EtmCnjPlxWhSXgd92W9v0JaVOf0rSS+UqjtIyiigWvtyPe+psKabmt4 JmoUVzxNdLLq+C49b9JIkLop5nM/R1QEHAp8u2pgDMcpmLB5s5wZ7IHBc A==; IronPort-SDR: 4bXM91bz94JBkS50mUue6hEEVC24+F+IenwchuSuRTQLZwVC8ayyRJrFA/Rp7UE5tz64Q7MMmq IpeJwvnwDXo6CrzBBsEZN/Na3fFevarfWVOinUclijCCXfODmoUAmQKsCbVvVr/6nwircRWIAg q7QB5jGuhV5eOmImn/WPx+ytBPUOCo4rqjks4qQkEoiDitODrEGcvfcvmAShuWSIY2ikPu/s1E C++0Z7zrxdyLRrA6t5F9ZhqRW1RW71S164gjE6mzCag+KdDAoCm+OKDVict0G+1LMOClZrSXB7 tC4= X-IronPort-AV: E=Sophos;i="5.77,324,1596470400"; d="scan'208";a="150036841" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 02 Oct 2020 02:38:44 +0800 IronPort-SDR: eJT85jVFDAhWTO4lwNmpnaSMtrdCiz/fj5LoeYxewIm3EfL3OxtD6pad3RrDTtJ13WNLib4e6N VRT96mKcfwxg== Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2020 11:24:40 -0700 IronPort-SDR: Acg0lP1uR9Pn9ccqUWB593gGmUa0AnugzrsbUUef/vdJOD0ZwUad7Lr/c8EWBY2IDEyv1/2pmW m2ZsT0Ic11AA== WDCIronportException: Internal Received: from naota.dhcp.fujisawa.hgst.com ([10.149.52.155]) by uls-op-cesaip02.wdc.com with ESMTP; 01 Oct 2020 11:38:43 -0700 From: Naohiro Aota To: linux-btrfs@vger.kernel.org, dsterba@suse.com Cc: hare@suse.com, linux-fsdevel@vger.kernel.org, Naohiro Aota , Josef Bacik Subject: [PATCH v8 36/41] btrfs: relocate block group to repair IO failure in ZONED Date: Fri, 2 Oct 2020 03:36:43 +0900 Message-Id: <2e1473edbe7144719eaa72444fa24cc3ac5074d7.1601574234.git.naohiro.aota@wdc.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org When btrfs find a checksum error and if the file system has a mirror of the damaged data, btrfs read the correct data from the mirror and write the data to damaged blocks. This repairing, however, is against the sequential write required rule. We can consider three methods to repair an IO failure in ZONED mode: (1) Reset and rewrite the damaged zone (2) Allocate new device extent and replace the damaged device extent to the new extent (3) Relocate the corresponding block group Method (1) is most similar to a behavior done with regular devices. However, it also wipes non-damaged data in the same device extent, and so it unnecessary degrades non-damaged data. Method (2) is much like device replacing but done in the same device. It is safe because it keeps the device extent until the replacing finish. However, extending device replacing is non-trivial. It assumes "src_dev->physical == dst_dev->physical". Also, the extent mapping replacing function should be extended to support replacing device extent position in one device. Method (3) invokes relocation of the damaged block group, so it is straightforward to implement. It relocates all the mirrored device extents, so it is, potentially, a more costly operation than method (1) or (2). But it relocates only using extents which reduce the total IO size. Let's apply method (3) for now. In the future, we can extend device-replace and apply method (2). For protecting a block group gets relocated multiple time with multiple IO errors, this commit introduces "relocating_repair" bit to show it's now relocating to repair IO failures. Also it uses a new kthread "btrfs-relocating-repair", not to block IO path with relocating process. This commit also supports repairing in the scrub process. Reviewed-by: Josef Bacik Signed-off-by: Naohiro Aota --- fs/btrfs/block-group.h | 1 + fs/btrfs/extent_io.c | 3 ++ fs/btrfs/scrub.c | 3 ++ fs/btrfs/volumes.c | 71 ++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/volumes.h | 1 + 5 files changed, 79 insertions(+) diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index e91123495d68..50e5ddb0a19b 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -96,6 +96,7 @@ struct btrfs_block_group { unsigned int has_caching_ctl:1; unsigned int removed:1; unsigned int to_copy:1; + unsigned int relocating_repair:1; int disk_cache_state; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index ed6a9fce016d..b93c67e8ba1d 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2268,6 +2268,9 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, ASSERT(!(fs_info->sb->s_flags & SB_RDONLY)); BUG_ON(!mirror_num); + if (btrfs_fs_incompat(fs_info, ZONED)) + return btrfs_repair_one_zone(fs_info, logical); + bio = btrfs_io_bio_alloc(1); bio->bi_iter.bi_size = 0; map_length = length; diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 2e607caa5ab9..4c247a1618d0 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -861,6 +861,9 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) have_csum = sblock_to_check->pagev[0]->have_csum; dev = sblock_to_check->pagev[0]->dev; + if (btrfs_fs_incompat(fs_info, ZONED) && !sctx->is_dev_replace) + return btrfs_repair_one_zone(fs_info, logical); + /* * We must use GFP_NOFS because the scrub task might be waiting for a * worker task executing this function and in turn a transaction commit diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index af2ed4d3389f..33380f20a206 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -7975,3 +7975,74 @@ bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr) spin_unlock(&fs_info->swapfile_pins_lock); return node != NULL; } + +static int relocating_repair_kthread(void *data) +{ + struct btrfs_block_group *cache = (struct btrfs_block_group *) data; + struct btrfs_fs_info *fs_info = cache->fs_info; + u64 target; + int ret = 0; + + target = cache->start; + btrfs_put_block_group(cache); + + if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { + btrfs_info(fs_info, + "skip relocating block group %llu to repair: EBUSY", + target); + return -EBUSY; + } + + mutex_lock(&fs_info->delete_unused_bgs_mutex); + + /* ensure Block Group still exists */ + cache = btrfs_lookup_block_group(fs_info, target); + if (!cache) + goto out; + + if (!cache->relocating_repair) + goto out; + + ret = btrfs_may_alloc_data_chunk(fs_info, target); + if (ret < 0) + goto out; + + btrfs_info(fs_info, "relocating block group %llu to repair IO failure", + target); + ret = btrfs_relocate_chunk(fs_info, target); + +out: + if (cache) + btrfs_put_block_group(cache); + mutex_unlock(&fs_info->delete_unused_bgs_mutex); + btrfs_exclop_finish(fs_info); + + return ret; +} + +int btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical) +{ + struct btrfs_block_group *cache; + + /* do not attempt to repair in degraded state */ + if (btrfs_test_opt(fs_info, DEGRADED)) + return 0; + + cache = btrfs_lookup_block_group(fs_info, logical); + if (!cache) + return 0; + + spin_lock(&cache->lock); + if (cache->relocating_repair) { + spin_unlock(&cache->lock); + btrfs_put_block_group(cache); + return 0; + } + cache->relocating_repair = 1; + spin_unlock(&cache->lock); + + kthread_run(relocating_repair_kthread, cache, + "btrfs-relocating-repair"); + + return 0; +} diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index f8fc3debd5e0..7f1a38c820e3 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -584,5 +584,6 @@ void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, int btrfs_bg_type_to_factor(u64 flags); const char *btrfs_bg_type_to_raid_name(u64 flags); int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); +int btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); #endif