From patchwork Fri Jan 22 06:21:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naohiro Aota X-Patchwork-Id: 12038475 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 4FD1EC433E0 for ; Fri, 22 Jan 2021 06:29:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09CA1235FF for ; Fri, 22 Jan 2021 06:29:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726982AbhAVG31 (ORCPT ); Fri, 22 Jan 2021 01:29:27 -0500 Received: from esa1.hgst.iphmx.com ([68.232.141.245]:51034 "EHLO esa1.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726674AbhAVG1W (ORCPT ); Fri, 22 Jan 2021 01:27:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1611296842; x=1642832842; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7bhI4GsdYtyiwv2jI0vmusT05p0v6H3hNyj5go0qKkg=; b=WmAe8wOGE/2py9ehSqFlCdLn+0fOan82IzKkDV5ohYoauCIVLxivrXsT AP+We41tLOTzS3jKWZQhPfr7tbx9NeUcQ7OunVmhCrgi197bBA8qkp4es CD0yFXrzdDdOTsoMnbkR+0aAj42etf0gx+ya93MeV6Vp9EdscTFjDVNUW rZFzPhP2RyPaP1mPkeRhsU1XQxTMJjEW9kcwM1AP4DFVnaK8UhK1mBP4L SeYOBtkprkQ+vBwn+S8TNykvSVeeyn4DIe9y5s3Ix3wDnJu/sYwWeOgyH OiTubeyO+cd4MfO4tVI1H1USKcf0Ylw3/rJ2jrcTNwbn7GMfAbu8ZTc6v w==; IronPort-SDR: CFCaQJZuVUydGjzl4gT4AcxSKz6gJRRU9ZE4OrW1yxFIe9Ae8HXjh9UfWeRKf/zA9xX8oij4Ui C3NBCBqTC25BLwdoATKH84xjiTBcw6vCjkdUm1jE4Y4YVpuBbnuM/YBV1GNgQU8MklUv4YznQX qos3z7/t9aAWXZWgj8Xkcg2fT2XkYx24QvxF/Z4nnfZDpjMT9mTr8u5hnjHboFQuVwtMvwXbwT Ek5dYa54ZqYSE79fXsdRF0uc/p3ypCbyvPNUQuYdZP3aKblLMTP1tB3sKXkXTzohyTP3M3Y26W +D8= X-IronPort-AV: E=Sophos;i="5.79,365,1602518400"; d="scan'208";a="268392047" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 22 Jan 2021 14:23:10 +0800 IronPort-SDR: HH8YBtHFr++rrZfz/rQ6CIuLEnuD8LwDFKPQrsatAbXeN8DvrxbOCEj7vc942fPIc64un10x2d /pKAhZHnbT5IqN8QKd75xl6Y2f8Vsj0UYNzoqZso8NiMkCQaAeU36sfqwxo8nYidRFir05fSgk 7AqGtSSZyVvm9S93hZtUwbnfx7wBKSasRTO2r0zug2ndizGlVHCZ+U9n59rUES1aKp8pdN2lHo GfB+XZXQsSPiLzIVfn2NDSI7p9GF0E2onEituFr8A323RMomdz11zeuXrxOf+3t6fWGM7AJ46b 0vmCYM68WK4MxdX0cRZmfbpj 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; 21 Jan 2021 22:05:42 -0800 IronPort-SDR: KdI+XdayyETU9xW6I4j+UJTjPIeoI4QqAhLMP6ZUkHm6m02ym97Hq0N48TvgvpMDWfmvi/DE2W TaYZbWmKyubmOhkjjGMzt219yi5hQaV8zEyXxtB41ouI+TclCdPJDLeF7MTZxWosdmKkNO43Fb PGyc1H6TxeuHldpaznBe8NcZYhcIaLKBNelcFKNfb1krJqJlFBBELM+/4B7kYwN6fi9Z1VAapk NKtaFn8xbiVKx+e1wqBEyKC/1TiH6AnuD5z5YLzk6X40lUMgpaVQCNY4UbbGaPOmcBL4EgTSIy S9M= WDCIronportException: Internal Received: from naota.dhcp.fujisawa.hgst.com ([10.149.52.155]) by uls-op-cesaip02.wdc.com with ESMTP; 21 Jan 2021 22:23:09 -0800 From: Naohiro Aota To: linux-btrfs@vger.kernel.org, dsterba@suse.com Cc: hare@suse.com, linux-fsdevel@vger.kernel.org, Jens Axboe , Christoph Hellwig , "Darrick J. Wong" , Naohiro Aota , Josef Bacik Subject: [PATCH v13 30/42] btrfs: serialize meta IOs on ZONED mode Date: Fri, 22 Jan 2021 15:21:30 +0900 Message-Id: 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 We cannot use zone append for writing metadata, because the B-tree nodes have references to each other using the logical address. Without knowing the address in advance, we cannot construct the tree in the first place. So we need to serialize write IOs for metadata. We cannot add a mutex around allocation and submission because metadata blocks are allocated in an earlier stage to build up B-trees. Add a zoned_meta_io_lock and hold it during metadata IO submission in btree_write_cache_pages() to serialize IOs. Furthermore, this add a per-block group metadata IO submission pointer "meta_write_pointer" to ensure sequential writing, which can be caused when writing back blocks in an unfinished transaction. Reviewed-by: Josef Bacik Signed-off-by: Naohiro Aota --- fs/btrfs/block-group.h | 1 + fs/btrfs/ctree.h | 1 + fs/btrfs/disk-io.c | 1 + fs/btrfs/extent_io.c | 25 ++++++++++++++++++++- fs/btrfs/zoned.c | 50 ++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/zoned.h | 32 +++++++++++++++++++++++++++ 6 files changed, 109 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index a1d96c4cfa3b..19a22bf930c6 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -192,6 +192,7 @@ struct btrfs_block_group { */ u64 alloc_offset; u64 zone_unusable; + u64 meta_write_pointer; }; static inline u64 btrfs_block_group_end(struct btrfs_block_group *block_group) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 1b6f66575471..4e9c55171ddb 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -972,6 +972,7 @@ struct btrfs_fs_info { /* Max size to emit ZONE_APPEND write command */ u64 max_zone_append_size; + struct mutex zoned_meta_io_lock; #ifdef CONFIG_BTRFS_FS_REF_VERIFY spinlock_t ref_verify_lock; diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index ba0ca953f7e5..a41bdf9312d6 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2704,6 +2704,7 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info) mutex_init(&fs_info->delete_unused_bgs_mutex); mutex_init(&fs_info->reloc_mutex); mutex_init(&fs_info->delalloc_root_mutex); + mutex_init(&fs_info->zoned_meta_io_lock); seqlock_init(&fs_info->profiles_lock); INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index e0d212fd5678..ed976f6e620c 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -25,6 +25,7 @@ #include "backref.h" #include "disk-io.h" #include "zoned.h" +#include "block-group.h" static struct kmem_cache *extent_state_cache; static struct kmem_cache *extent_buffer_cache; @@ -4074,6 +4075,7 @@ static int submit_eb_page(struct page *page, struct writeback_control *wbc, struct extent_buffer **eb_context) { struct address_space *mapping = page->mapping; + struct btrfs_block_group *cache = NULL; struct extent_buffer *eb; int ret; @@ -4106,13 +4108,31 @@ static int submit_eb_page(struct page *page, struct writeback_control *wbc, if (!ret) return 0; + if (!btrfs_check_meta_write_pointer(eb->fs_info, eb, &cache)) { + /* + * If for_sync, this hole will be filled with + * trasnsaction commit. + */ + if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync) + ret = -EAGAIN; + else + ret = 0; + free_extent_buffer(eb); + return ret; + } + *eb_context = eb; ret = lock_extent_buffer_for_io(eb, epd); if (ret <= 0) { + btrfs_revert_meta_write_pointer(cache, eb); + if (cache) + btrfs_put_block_group(cache); free_extent_buffer(eb); return ret; } + if (cache) + btrfs_put_block_group(cache); ret = write_one_eb(eb, wbc, epd); free_extent_buffer(eb); if (ret < 0) @@ -4158,6 +4178,7 @@ int btree_write_cache_pages(struct address_space *mapping, tag = PAGECACHE_TAG_TOWRITE; else tag = PAGECACHE_TAG_DIRTY; + btrfs_zoned_meta_io_lock(fs_info); retry: if (wbc->sync_mode == WB_SYNC_ALL) tag_pages_for_writeback(mapping, index, end); @@ -4198,7 +4219,7 @@ int btree_write_cache_pages(struct address_space *mapping, } if (ret < 0) { end_write_bio(&epd, ret); - return ret; + goto out; } /* * If something went wrong, don't allow any metadata write bio to be @@ -4233,6 +4254,8 @@ int btree_write_cache_pages(struct address_space *mapping, ret = -EROFS; end_write_bio(&epd, ret); } +out: + btrfs_zoned_meta_io_unlock(fs_info); return ret; } diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index aa158735a1e6..b66f57119068 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -1161,6 +1161,9 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new) ret = -EIO; } + if (!ret) + cache->meta_write_pointer = cache->alloc_offset + cache->start; + kfree(alloc_offsets); free_extent_map(em); @@ -1325,3 +1328,50 @@ void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered) kfree(logical); bdput(bdev); } + +bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, + struct btrfs_block_group **cache_ret) +{ + struct btrfs_block_group *cache; + bool ret = true; + + if (!btrfs_is_zoned(fs_info)) + return true; + + cache = *cache_ret; + + if (cache && (eb->start < cache->start || + cache->start + cache->length <= eb->start)) { + btrfs_put_block_group(cache); + cache = NULL; + *cache_ret = NULL; + } + + if (!cache) + cache = btrfs_lookup_block_group(fs_info, eb->start); + + if (cache) { + if (cache->meta_write_pointer != eb->start) { + btrfs_put_block_group(cache); + cache = NULL; + ret = false; + } else { + cache->meta_write_pointer = eb->start + eb->len; + } + + *cache_ret = cache; + } + + return ret; +} + +void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache, + struct extent_buffer *eb) +{ + if (!btrfs_is_zoned(eb->fs_info) || !cache) + return; + + ASSERT(cache->meta_write_pointer == eb->start + eb->len); + cache->meta_write_pointer = eb->start; +} diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h index cf420964305f..a42e120158ab 100644 --- a/fs/btrfs/zoned.h +++ b/fs/btrfs/zoned.h @@ -50,6 +50,11 @@ bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em); void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset, struct bio *bio); void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered); +bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, + struct btrfs_block_group **cache_ret); +void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache, + struct extent_buffer *eb); #else /* CONFIG_BLK_DEV_ZONED */ static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, struct blk_zone *zone) @@ -151,6 +156,19 @@ static inline void btrfs_record_physical_zoned(struct inode *inode, static inline void btrfs_rewrite_logical_zoned( struct btrfs_ordered_extent *ordered) { } +static inline bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, + struct btrfs_block_group **cache_ret) +{ + return true; +} + +static inline void btrfs_revert_meta_write_pointer( + struct btrfs_block_group *cache, + struct extent_buffer *eb) +{ +} + #endif static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos) @@ -243,4 +261,18 @@ static inline bool btrfs_can_zone_reset(struct btrfs_device *device, return true; } +static inline void btrfs_zoned_meta_io_lock(struct btrfs_fs_info *fs_info) +{ + if (!btrfs_is_zoned(fs_info)) + return; + mutex_lock(&fs_info->zoned_meta_io_lock); +} + +static inline void btrfs_zoned_meta_io_unlock(struct btrfs_fs_info *fs_info) +{ + if (!btrfs_is_zoned(fs_info)) + return; + mutex_unlock(&fs_info->zoned_meta_io_lock); +} + #endif