From nobody Tue Feb 10 13:01:52 2026 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (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 17E131DE2A7; Sat, 25 Oct 2025 03:30:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761363016; cv=none; b=a36vHekdV+Cnwyf0ZIn+97A0W+5xBb1vzZvpWyT3+lErvhnBcXJv0nvfnuum1BF96F5f5Ma9vBmzOr8ON9mQWNbvRSzVMlo2gqdRXTs0K4+20+h2YENfehp0b16gcuauNaBRcUWRB/ve8WxjsqM3Hkff0pkTT0mkm4fDUSVkE3M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761363016; c=relaxed/simple; bh=HJG6BV4y/laly37/ga9zMZpAoAiq+tujKGnfMeijWwg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=d4CYGkT5e1PKnTd+96yIO7EP/MGtRfZSALlquBxVOM4M4E1Go5Xz9PmTYvZ27FdSQNF3d1A1tvfQSy4x0lQqnHjvzb6chFIwsBF+VjvY9YbFmAsSzl/mxU58bq5HB8X3KMZJS/HqegwLk1Jc5EmzwaHb7cK+XEaoAb+18lW81YY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4ctlcS20J6zKHMP3; Sat, 25 Oct 2025 11:29:12 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.75]) by mail.maildlp.com (Postfix) with ESMTP id F1A241A116C; Sat, 25 Oct 2025 11:30:03 +0800 (CST) Received: from huaweicloud.com (unknown [10.50.87.129]) by APP2 (Coremail) with SMTP id Syh0CgBHnEQ6RPxox1YbBg--.45388S11; Sat, 25 Oct 2025 11:30:03 +0800 (CST) From: libaokun@huaweicloud.com To: linux-ext4@vger.kernel.org Cc: tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz, linux-kernel@vger.kernel.org, kernel@pankajraghav.com, mcgrof@kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, yi.zhang@huawei.com, yangerkun@huawei.com, chengzhihao1@huawei.com, libaokun1@huawei.com, libaokun@huaweicloud.com Subject: [PATCH 07/25] ext4: support large block size in ext4_calculate_overhead() Date: Sat, 25 Oct 2025 11:22:03 +0800 Message-Id: <20251025032221.2905818-8-libaokun@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20251025032221.2905818-1-libaokun@huaweicloud.com> References: <20251025032221.2905818-1-libaokun@huaweicloud.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 X-CM-TRANSID: Syh0CgBHnEQ6RPxox1YbBg--.45388S11 X-Coremail-Antispam: 1UD129KBjvJXoW7uw4DZw45Zw13CF1kKFy7trb_yoW8WF1xp3 Z3GryxGrWruFy8uanrWa9rJF15K3yxGFyUKFWa9ry3urW7ta4S9ry3KFy5tr4xXFWxuryS v3W5KrWfuF15Gw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUQa14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUXVWUAwAv7VC2z280aVAFwI0_Gr1j6F4UJwAm72CE4IkC6x0Yz7v_Jr0_ Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8c xan2IY04v7M4kE6xkIj40Ew7xC0wCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxG rwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4 vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IY x2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw2 0EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x02 67AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUdsqAUUUUU= X-CM-SenderInfo: 5olet0hnxqqx5xdzvxpfor3voofrz/1tbiAgAMBWj7Ua9I6gAEsA Content-Type: text/plain; charset="utf-8" From: Baokun Li ext4_calculate_overhead() used a single page for its bitmap buffer, which worked fine when PAGE_SIZE >=3D block size. However, with block size greater than page size (BS > PS) support, the bitmap can exceed a single page. To address this, we now use __get_free_pages() to allocate multiple pages, sized to the block size, to properly support BS > PS. Signed-off-by: Baokun Li Reviewed-by: Zhang Yi --- fs/ext4/super.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d353e25a5b92..7338c708ea1d 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4182,7 +4182,8 @@ int ext4_calculate_overhead(struct super_block *sb) unsigned int j_blocks, j_inum =3D le32_to_cpu(es->s_journal_inum); ext4_group_t i, ngroups =3D ext4_get_groups_count(sb); ext4_fsblk_t overhead =3D 0; - char *buf =3D (char *) get_zeroed_page(GFP_NOFS); + gfp_t gfp =3D GFP_NOFS | __GFP_ZERO; + char *buf =3D (char *)__get_free_pages(gfp, sbi->s_min_folio_order); =20 if (!buf) return -ENOMEM; @@ -4207,7 +4208,7 @@ int ext4_calculate_overhead(struct super_block *sb) blks =3D count_overhead(sb, i, buf); overhead +=3D blks; if (blks) - memset(buf, 0, PAGE_SIZE); + memset(buf, 0, sb->s_blocksize); cond_resched(); } =20 @@ -4230,7 +4231,7 @@ int ext4_calculate_overhead(struct super_block *sb) } sbi->s_overhead =3D overhead; smp_wmb(); - free_page((unsigned long) buf); + free_pages((unsigned long)buf, sbi->s_min_folio_order); return 0; } =20 --=20 2.46.1