From nobody Tue Dec 2 02:17:29 2025 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 6F27D303CA1; Fri, 21 Nov 2025 09:16:53 +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=1763716623; cv=none; b=urenZVuMNh3jo/TICX7hV/UpdQjyf9+/EdkBnOzDswh+WNIHUnaCp4++rAfFoh++xdACVq11n0udY1X4DRkSbXhse7QNS1rA9VZBxwzNJf23OlXoIn0MmiA99V0rjhBN8j7lBaTqfNMQyJjp3ir2h+kpT8HJdYNDkQUsj2WcP40= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763716623; c=relaxed/simple; bh=aF+DbgPYapqeQ+9Sv3+u8mH464IRHeCbCP54ohxIjj0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AWhp7PiELtNVHiwQR1LJUUmEmsUAKhu/vws0DvdOiocqul64digC/yA9FWgflOJJYDU8bu8dW7G15sSI9kS2Cx3NefKSjvVlVkXNq7sdow5HsUqeCQOT6Om7MJWrI7jqjOBp+mgLV45lV6ojlQV2uq54/8KT0MUeNLsIt0mJg6o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=none 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=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4dCV2P2X08zKHMwX; Fri, 21 Nov 2025 17:16:13 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.75]) by mail.maildlp.com (Postfix) with ESMTP id 4F5921A0FC0; Fri, 21 Nov 2025 17:16:44 +0800 (CST) Received: from huaweicloud.com (unknown [10.50.87.129]) by APP2 (Coremail) with SMTP id Syh0CgBHpXv4LSBpaLMDBg--.2072S28; Fri, 21 Nov 2025 17:16:44 +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, ebiggers@kernel.org, willy@infradead.org, yi.zhang@huawei.com, yangerkun@huawei.com, chengzhihao1@huawei.com, libaokun1@huawei.com, libaokun@huaweicloud.com, Pankaj Raghav Subject: [PATCH v4 24/24] ext4: enable block size larger than page size Date: Fri, 21 Nov 2025 17:06:54 +0800 Message-Id: <20251121090654.631996-25-libaokun@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20251121090654.631996-1-libaokun@huaweicloud.com> References: <20251121090654.631996-1-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: Syh0CgBHpXv4LSBpaLMDBg--.2072S28 X-Coremail-Antispam: 1UD129KBjvJXoWxAr4fAryUXrWUtF1DZFWUurg_yoW5WrWxp3 WrGFy8Ar15WFyUua9rWFsF9as3Gw1v9FyUXr90gw1UZFZrX34xKrn7tFy5XFyjqrZ3uFWf XF1vyryayr43uaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUQa14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUXVWUAwAv7VC2z280aVAFwI0_Gr1j6F4UJwAm72CE4IkC6x0Yz7v_Jr0_ Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8c xan2IY04v7M4kE6xkIj40Ew7xC0wCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxG rwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4 vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IY x2IY67AKxVW5JVW7JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw2 0EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x02 67AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUdsqAUUUUU= X-CM-SenderInfo: 5olet0hnxqqx5xdzvxpfor3voofrz/1tbiAQATBWkf35kfHAAAsk Content-Type: text/plain; charset="utf-8" From: Baokun Li Since block device (See commit 3c20917120ce ("block/bdev: enable large folio support for large logical block sizes")) and page cache (See commit ab95d23bab220ef8 ("filemap: allocate mapping_min_order folios in the page cache")) has the ability to have a minimum order when allocating folio, and ext4 has supported large folio in commit 7ac67301e82f ("ext4: enable large folio for regular file"), now add support for block_size > PAGE_SIZE in ext4. set_blocksize() -> bdev_validate_blocksize() already validates the block size, so ext4_load_super() does not need to perform additional checks. Here we only need to add the FS_LBS bit to fs_flags. In addition, block sizes larger than the page size are currently supported only when CONFIG_TRANSPARENT_HUGEPAGE is enabled. To make this explicit, a blocksize_gt_pagesize entry has been added under /sys/fs/ext4/feature/, indicating whether bs > ps is supported. This allows mke2fs to check the interface and determine whether a warning should be issued when formatting a filesystem with block size larger than the page size. Suggested-by: Theodore Ts'o Signed-off-by: Baokun Li Reviewed-by: Zhang Yi Reviewed-by: Jan Kara Reviewed-by: Pankaj Raghav --- fs/ext4/super.c | 3 ++- fs/ext4/sysfs.c | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 3d03a6eb0ea0..87205660c5d0 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -7453,7 +7453,8 @@ static struct file_system_type ext4_fs_type =3D { .init_fs_context =3D ext4_init_fs_context, .parameters =3D ext4_param_specs, .kill_sb =3D ext4_kill_sb, - .fs_flags =3D FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME, + .fs_flags =3D FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME | + FS_LBS, }; MODULE_ALIAS_FS("ext4"); =20 diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index 987bd00f916a..0018e09b867e 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -332,6 +332,9 @@ EXT4_ATTR_FEATURE(fast_commit); #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) EXT4_ATTR_FEATURE(encrypted_casefold); #endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +EXT4_ATTR_FEATURE(blocksize_gt_pagesize); +#endif =20 static struct attribute *ext4_feat_attrs[] =3D { ATTR_LIST(lazy_itable_init), @@ -351,6 +354,9 @@ static struct attribute *ext4_feat_attrs[] =3D { ATTR_LIST(fast_commit), #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) ATTR_LIST(encrypted_casefold), +#endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + ATTR_LIST(blocksize_gt_pagesize), #endif NULL, }; --=20 2.46.1