From nobody Tue Jun 16 11:28:08 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5D4F28469F; Sun, 19 Apr 2026 03:10:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568200; cv=none; b=QKweJLaZCmM0fK0vM9Sa7u1b/TcTFy8cvMKtdxBeMw28P0IZ3AxEgLzGCBxtpVxsTm5zole6CcAX7wZVkS/K7Nj4BLgUgVCGbQ3VexgtvBe+0rMgQGVU2kFRPvmIr9XsKjIhU+lFJvaz/XXHeW+ff2pm6WmGesFZ2576jnI83+Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568200; c=relaxed/simple; bh=n1bk0g18fPyZF8doFUceYxwQaccP+IPL63TYbKi0mFU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rpTy+GRby62+Cl4x4aibbCT/xDpd0pFt+eBERLi6+4EDcZYcFYfMk81YrcWsQeULgQ0LWXP1QjF8cNtZZWg9XuCfcPdygKKB088B5jA7zpXbZBDfCg9xN9m2E+iijUNrk2kJVwIvnhLKKgPUcyTFK3JEts8gHi5+Ux3nB8FrJcw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C244AC2BCB0; Sun, 19 Apr 2026 03:09:58 +0000 (UTC) From: Yu Kuai To: linux-raid@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Li Nan , Yu Kuai , Cheng Cheng Subject: [PATCH] md/md-llbitmap: track bitmap sync_size explicitly Date: Sun, 19 Apr 2026 11:09:26 +0800 Message-ID: <20260419030942.824195-4-yukuai@fnnas.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260419030942.824195-1-yukuai@fnnas.com> References: <20260419030942.824195-1-yukuai@fnnas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Track llbitmap's own sync_size instead of always using mddev->resync_max_sectors directly. This is the minimal bookkeeping needed before llbitmap can track old and new reshape geometry independently. Signed-off-by: Yu Kuai --- drivers/md/md-llbitmap.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c index 62b8f3efa9f5..547b1317df43 100644 --- a/drivers/md/md-llbitmap.c +++ b/drivers/md/md-llbitmap.c @@ -267,6 +267,8 @@ struct llbitmap { unsigned long chunksize; /* total number of chunks */ unsigned long chunks; + /* total number of sectors tracked by current bitmap geometry */ + sector_t sync_size; unsigned long last_end_sync; /* * time in seconds that dirty bits will be cleared if the page is not @@ -791,6 +793,7 @@ static int llbitmap_init(struct llbitmap *llbitmap) llbitmap->chunkshift =3D ffz(~chunksize); llbitmap->chunksize =3D chunksize; llbitmap->chunks =3D chunks; + llbitmap->sync_size =3D blocks; mddev->bitmap_info.daemon_sleep =3D DEFAULT_DAEMON_SLEEP; =20 ret =3D llbitmap_cache_pages(llbitmap); @@ -811,6 +814,7 @@ static int llbitmap_read_sb(struct llbitmap *llbitmap) unsigned long daemon_sleep; unsigned long chunksize; unsigned long events; + sector_t sync_size; struct page *sb_page; bitmap_super_t *sb; int ret =3D -EINVAL; @@ -860,6 +864,9 @@ static int llbitmap_read_sb(struct llbitmap *llbitmap) goto out_put_page; } =20 + sync_size =3D le64_to_cpu(sb->sync_size); + if (!sync_size) + sync_size =3D mddev->resync_max_sectors; chunksize =3D le32_to_cpu(sb->chunksize); if (!is_power_of_2(chunksize)) { pr_err("md/llbitmap: %s: chunksize not a power of 2", @@ -895,8 +902,9 @@ static int llbitmap_read_sb(struct llbitmap *llbitmap) =20 llbitmap->barrier_idle =3D DEFAULT_BARRIER_IDLE; llbitmap->chunksize =3D chunksize; - llbitmap->chunks =3D DIV_ROUND_UP_SECTOR_T(mddev->resync_max_sectors, chu= nksize); + llbitmap->chunks =3D DIV_ROUND_UP_SECTOR_T(sync_size, chunksize); llbitmap->chunkshift =3D ffz(~chunksize); + llbitmap->sync_size =3D sync_size; ret =3D llbitmap_cache_pages(llbitmap); =20 out_put_page: @@ -1026,6 +1034,7 @@ static int llbitmap_resize(struct mddev *mddev, secto= r_t blocks, int chunksize) llbitmap->chunkshift =3D ffz(~chunksize); llbitmap->chunksize =3D chunksize; llbitmap->chunks =3D chunks; + llbitmap->sync_size =3D blocks; =20 return 0; } @@ -1384,7 +1393,7 @@ static void llbitmap_update_sb(void *data) sb->events =3D cpu_to_le64(mddev->events); sb->state =3D cpu_to_le32(llbitmap->flags); sb->chunksize =3D cpu_to_le32(llbitmap->chunksize); - sb->sync_size =3D cpu_to_le64(mddev->resync_max_sectors); + sb->sync_size =3D cpu_to_le64(llbitmap->sync_size); sb->events_cleared =3D cpu_to_le64(llbitmap->events_cleared); sb->sectors_reserved =3D cpu_to_le32(mddev->bitmap_info.space); sb->daemon_sleep =3D cpu_to_le32(mddev->bitmap_info.daemon_sleep); @@ -1402,6 +1411,7 @@ static int llbitmap_get_stats(void *data, struct md_b= itmap_stats *stats) stats->missing_pages =3D 0; stats->pages =3D llbitmap->nr_pages; stats->file_pages =3D llbitmap->nr_pages; + stats->sync_size =3D llbitmap->sync_size; =20 stats->behind_writes =3D atomic_read(&llbitmap->behind_writes); stats->behind_wait =3D wq_has_sleeper(&llbitmap->behind_wait); --=20 2.51.0