From patchwork Thu Oct 1 18:36:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naohiro Aota X-Patchwork-Id: 11812303 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 10074112E for ; Thu, 1 Oct 2020 18:39:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E19C3207DE for ; Thu, 1 Oct 2020 18:39:24 +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="Fs2mGwVS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733160AbgJASjX (ORCPT ); Thu, 1 Oct 2020 14:39:23 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:24779 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733086AbgJASjC (ORCPT ); Thu, 1 Oct 2020 14:39:02 -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=1601577543; x=1633113543; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=g83IDaetFeG2qxHEJsxkSMJbqm1nC0dkIReub0/vubg=; b=Fs2mGwVS0FzrXhpX/BejfYxnnthSTjAZkT6Q94UAAJo+HwBDlPuVxS15 chxQ/1NT0k15wUVi7R3gIsZvCc8NgfuGzm3BxN2BCXisZ7mW9vRgQtIVG AvZVNKK+QToQ6BArWgLNbiRzh9xFIPWrzac1gRBDyKnXlDt6XtgTZZi1u RXiBCuJi07p+4nnQpW0Rh/CkOvtbc5BkwGbrU85Vh1OLJOhpaRhHZBzsj 26KZaUMcSkkqIKQ8RRn4ezLixRaJXfCE1d/uo1yllk5sPsYkjRh3HWeRv qQNXy0JsBtGsiBCGc5XqwJ+Nr6y1eB4+I+t9FuXk4Djwl05cpMMzrRl8X g==; IronPort-SDR: fOUVVYRH/5C4mQ91W2t4p9mgStFe+UUwNfROQMtdrWT2Y2ndz0fM/cMMWkxuv6KYa1CiJxtTEC FRBE2UjRGkIF15DQ7VzVvGamQrDh7cfE8mLwjYXLPsFPjCDAZBltrqg40s4NGW7sn+oKngmNwy R9ITdGzbR6YfoAXxDzVYbNdk3/EMSkWXP7p6TM6Ir3oajYqTTfjq3K1jHuJSM+4XTDXUtgwyr/ FiM/brPc40ijcerU2/CjN5qPrvWzZxTDWljqib1KHB+9pGOUAdAlK6MQfcvD1nNRs3SBLaQ8NT AfA= X-IronPort-AV: E=Sophos;i="5.77,324,1596470400"; d="scan'208";a="150036827" 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 02:38:38 +0800 IronPort-SDR: sTFXU9TuFoBFs5zylhquPJU+7Z/HJRnGdS4POUHjtfZ6RmZt74KF0zRHGDclxNu4gB1nubkv44 t1MA0XGnZpqg== 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 11:24:34 -0700 IronPort-SDR: +RKVdMvDuJougfTXYcbz6Q8IodeFuIxy65WQijLy+k0YBsTbZRaxhysdJp9GUqCnbMX4viXJrl IuVHReHSWt4w== WDCIronportException: Internal Received: from naota.dhcp.fujisawa.hgst.com ([10.149.52.155]) by uls-op-cesaip02.wdc.com with ESMTP; 01 Oct 2020 11:38:37 -0700 From: Naohiro Aota To: linux-btrfs@vger.kernel.org, dsterba@suse.com Cc: hare@suse.com, linux-fsdevel@vger.kernel.org, Naohiro Aota Subject: [PATCH v8 31/41] btrfs: mark block groups to copy for device-replace Date: Fri, 2 Oct 2020 03:36:38 +0900 Message-Id: <83652d36a020f8c11e601d969cc8940a829020e9.1601574234.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 This is the 1/4 patch to support device-replace in ZONED mode. We have two types of I/Os during the device-replace process. One is an I/O to "copy" (by the scrub functions) all the device extents on the source device to the destination device. The other one is an I/O to "clone" (by handle_ops_on_dev_replace()) new incoming write I/Os from users to the source device into the target device. Cloning incoming I/Os can break the sequential write rule in the target device. When writing is mapped in the middle of a block group, the I/O is directed in the middle of a target device zone, which breaks the sequential write rule. However, the cloning function cannot be merely disabled since incoming I/Os targeting already copied device extents must be cloned so that the I/O is executed on the target device. We cannot use dev_replace->cursor_{left,right} to determine whether bio is going to not yet copied region. Since we have a time gap between finishing btrfs_scrub_dev() and rewriting the mapping tree in btrfs_dev_replace_finishing(), we can have a newly allocated device extent which is never cloned nor copied. So the point is to copy only already existing device extents. This patch introduces mark_block_group_to_copy() to mark existing block groups as a target of copying. Then, handle_ops_on_dev_replace() and dev-replace can check the flag to do their job. Signed-off-by: Naohiro Aota --- fs/btrfs/block-group.h | 1 + fs/btrfs/dev-replace.c | 175 +++++++++++++++++++++++++++++++++++++++++ fs/btrfs/dev-replace.h | 3 + fs/btrfs/scrub.c | 17 ++++ 4 files changed, 196 insertions(+) diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index b2a8a3beceac..e91123495d68 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -95,6 +95,7 @@ struct btrfs_block_group { unsigned int iref:1; unsigned int has_caching_ctl:1; unsigned int removed:1; + unsigned int to_copy:1; int disk_cache_state; diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 5e3554482af1..e86aff38aea4 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -22,6 +22,7 @@ #include "dev-replace.h" #include "sysfs.h" #include "zoned.h" +#include "block-group.h" /* * Device replace overview @@ -437,6 +438,176 @@ static char* btrfs_dev_name(struct btrfs_device *device) return rcu_str_deref(device->name); } +static int mark_block_group_to_copy(struct btrfs_fs_info *fs_info, + struct btrfs_device *src_dev) +{ + struct btrfs_path *path; + struct btrfs_key key; + struct btrfs_key found_key; + struct btrfs_root *root = fs_info->dev_root; + struct btrfs_dev_extent *dev_extent = NULL; + struct btrfs_block_group *cache; + struct extent_buffer *l; + struct btrfs_trans_handle *trans; + int slot; + int ret = 0; + u64 chunk_offset, length; + + /* Do not use "to_copy" on non-ZONED for now */ + if (!btrfs_fs_incompat(fs_info, ZONED)) + return 0; + + mutex_lock(&fs_info->chunk_mutex); + + /* ensulre we don't have pending new block group */ + while (fs_info->running_transaction && + !list_empty(&fs_info->running_transaction->dev_update_list)) { + mutex_unlock(&fs_info->chunk_mutex); + trans = btrfs_attach_transaction(root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + mutex_lock(&fs_info->chunk_mutex); + if (ret == -ENOENT) + continue; + else + goto out; + } + + ret = btrfs_commit_transaction(trans); + mutex_lock(&fs_info->chunk_mutex); + if (ret) + goto out; + } + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + + path->reada = READA_FORWARD; + path->search_commit_root = 1; + path->skip_locking = 1; + + key.objectid = src_dev->devid; + key.offset = 0ull; + key.type = BTRFS_DEV_EXTENT_KEY; + + while (1) { + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (ret < 0) + break; + if (ret > 0) { + if (path->slots[0] >= + btrfs_header_nritems(path->nodes[0])) { + ret = btrfs_next_leaf(root, path); + if (ret < 0) + break; + if (ret > 0) { + ret = 0; + break; + } + } else { + ret = 0; + } + } + + l = path->nodes[0]; + slot = path->slots[0]; + + btrfs_item_key_to_cpu(l, &found_key, slot); + + if (found_key.objectid != src_dev->devid) + break; + + if (found_key.type != BTRFS_DEV_EXTENT_KEY) + break; + + if (found_key.offset < key.offset) + break; + + dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); + length = btrfs_dev_extent_length(l, dev_extent); + + chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); + + cache = btrfs_lookup_block_group(fs_info, chunk_offset); + if (!cache) + goto skip; + + spin_lock(&cache->lock); + cache->to_copy = 1; + spin_unlock(&cache->lock); + + btrfs_put_block_group(cache); + +skip: + key.offset = found_key.offset + length; + btrfs_release_path(path); + } + + btrfs_free_path(path); +out: + mutex_unlock(&fs_info->chunk_mutex); + + return ret; +} + +bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, + struct btrfs_block_group *cache, + u64 physical) +{ + struct btrfs_fs_info *fs_info = cache->fs_info; + struct extent_map *em; + struct map_lookup *map; + u64 chunk_offset = cache->start; + int num_extents, cur_extent; + int i; + + /* Do not use "to_copy" on non-ZONED for now */ + if (!btrfs_fs_incompat(fs_info, ZONED)) + return true; + + spin_lock(&cache->lock); + if (cache->removed) { + spin_unlock(&cache->lock); + return true; + } + spin_unlock(&cache->lock); + + em = btrfs_get_chunk_map(fs_info, chunk_offset, 1); + BUG_ON(IS_ERR(em)); + map = em->map_lookup; + + num_extents = cur_extent = 0; + for (i = 0; i < map->num_stripes; i++) { + /* we have more device extent to copy */ + if (srcdev != map->stripes[i].dev) + continue; + + num_extents++; + if (physical == map->stripes[i].physical) + cur_extent = i; + } + + free_extent_map(em); + + if (num_extents > 1 && cur_extent < num_extents - 1) { + /* + * Has more stripes on this device. Keep this BG + * readonly until we finish all the stripes. + */ + return false; + } + + /* last stripe on this device */ + spin_lock(&cache->lock); + cache->to_copy = 0; + spin_unlock(&cache->lock); + + return true; +} + static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, int read_src) @@ -478,6 +649,10 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, if (ret) return ret; + ret = mark_block_group_to_copy(fs_info, src_device); + if (ret) + return ret; + down_write(&dev_replace->rwsem); switch (dev_replace->replace_state) { case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h index 60b70dacc299..3911049a5f23 100644 --- a/fs/btrfs/dev-replace.h +++ b/fs/btrfs/dev-replace.h @@ -18,5 +18,8 @@ int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info); int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info); int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace); +bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, + struct btrfs_block_group *cache, + u64 physical); #endif diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index aa1b36cf5c88..d0d7db3c8b0b 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -3500,6 +3500,17 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, if (!cache) goto skip; + + if (sctx->is_dev_replace && btrfs_fs_incompat(fs_info, ZONED)) { + spin_lock(&cache->lock); + if (!cache->to_copy) { + spin_unlock(&cache->lock); + ro_set = 0; + goto done; + } + spin_unlock(&cache->lock); + } + /* * Make sure that while we are scrubbing the corresponding block * group doesn't get its logical address and its device extents @@ -3631,6 +3642,12 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, scrub_pause_off(fs_info); + if (sctx->is_dev_replace && + !btrfs_finish_block_group_to_copy(dev_replace->srcdev, + cache, found_key.offset)) + ro_set = 0; + +done: down_write(&dev_replace->rwsem); dev_replace->cursor_left = dev_replace->cursor_right; dev_replace->item_needs_writeback = 1;