From nobody Sat Feb 7 18:21:00 2026 Received: from out30-101.freemail.mail.aliyun.com (out30-101.freemail.mail.aliyun.com [115.124.30.101]) (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 DE31C1272CA for ; Tue, 9 Apr 2024 11:30:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.101 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712662236; cv=none; b=u0WYyIPRGR12w7s7WqMN26+bRdyjyzpkgtgVQQfrvDcOZajd24+cCtBJLf+3+/vAhBikwODKK2pyf9k83e1IADAt+m/rbgs3R3QyqYeZOQOam1sRC3rQkJr2stWZqoyHGFx7jC4lnHyOx8u3wVXXM8oPq1pIw7l7o/s4UEOUap0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712662236; c=relaxed/simple; bh=1JnlwwUF2e2TkxUPAjgF0lmvZxEqpr6aRqa0G8jxZLA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=PdxqKL/2yhqkEqOXrNvTA5l4ZH55ANER/qLOVNO9cgRJ7r2t5JpX8hzrhptSRJ7A14hTP2mi+qe7jgqQcOfkOEtM8oooKE5a0Uug68b8QIsoaEoeoq9hTB7BIRB1VJEt6OonUF0jK9danCHdRfTHGiaauArSR9qYT03FzkEXbds= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=rAFjy8Df; arc=none smtp.client-ip=115.124.30.101 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="rAFjy8Df" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1712662225; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=C0zysPX1OGYstO665h3gZ/2br098P35fTMAWwjzjT0Y=; b=rAFjy8DfXUnt5fKOnJFE1BQpuRrbw672SRvqyWEpig8xXKGJmzTBI+ViCN7lKeh1qmNFmF/lQVG6oigOE6HfBTP95v05MNpXLaIRk1dNo8chEgg59LZpt9BXp4a1/eFuvWoAPOFKTLy5xMi0QiJJu2t3Hc9TBQQ5m0QJ0zkAs5o= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=hongzhen@linux.alibaba.com;NM=1;PH=DS;RN=9;SR=0;TI=SMTPD_---0W4EQnaa_1712662224; Received: from localhost(mailfrom:hongzhen@linux.alibaba.com fp:SMTPD_---0W4EQnaa_1712662224) by smtp.aliyun-inc.com; Tue, 09 Apr 2024 19:30:25 +0800 From: Hongzhen Luo To: xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: huyue2@coolpad.com, jefflexu@linux.alibaba.com, dhavale@google.com, linux-kernel@vger.kernel.org, Hongzhen Luo , Gao Xiang Subject: [PATCH v2] erofs: derive fsid from on-disk UUID for .statfs() if possible Date: Tue, 9 Apr 2024 19:30:22 +0800 Message-Id: <20240409113022.74720-1-hongzhen@linux.alibaba.com> X-Mailer: git-send-email 2.37.1 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" Use the superblock's UUID to generate the fsid when it's non-null. Reviewed-by: Gao Xiang Reviewed-by: Jingbo Xu Signed-off-by: Hongzhen Luo --- v2: update the conversion of UUID to fsid, which looks cleaner. v1: https://lore.kernel.org/all/20240409081135.6102-1-hongzhen@linux.alibab= a.com/ --- fs/erofs/super.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index c0eb139adb07..58e41dc201fc 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -923,22 +923,20 @@ static int erofs_statfs(struct dentry *dentry, struct= kstatfs *buf) { struct super_block *sb =3D dentry->d_sb; struct erofs_sb_info *sbi =3D EROFS_SB(sb); - u64 id =3D 0; - - if (!erofs_is_fscache_mode(sb)) - id =3D huge_encode_dev(sb->s_bdev->bd_dev); =20 buf->f_type =3D sb->s_magic; buf->f_bsize =3D sb->s_blocksize; buf->f_blocks =3D sbi->total_blocks; buf->f_bfree =3D buf->f_bavail =3D 0; - buf->f_files =3D ULLONG_MAX; buf->f_ffree =3D ULLONG_MAX - sbi->inos; - buf->f_namelen =3D EROFS_NAME_LEN; =20 - buf->f_fsid =3D u64_to_fsid(id); + if (uuid_is_null(&sb->s_uuid)) + buf->f_fsid =3D u64_to_fsid(erofs_is_fscache_mode(sb) ? 0 : + huge_encode_dev(sb->s_bdev->bd_dev)); + else + buf->f_fsid =3D uuid_to_fsid(sb->s_uuid.b); return 0; } =20 --=20 2.37.1