From nobody Sat Feb 7 11:05:06 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 6CEC37F7F4 for ; Tue, 9 Apr 2024 08:11:41 +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=1712650305; cv=none; b=EmDysqJ0AhFS+qsK7PZ6XrtCjts86HmmQCYb37MLBnI26Hrd94W/l5i6M7BANMhoY77g7MOJTMJpeyouXpVdjHCQhmQZBF1/ua7Jfe5sXXP2r+nmWceWVvWfw3I+CYJy6VL6AV7akBgzKYNQ2wMfSriwykuNFKiaOsbmtAHdJF4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712650305; c=relaxed/simple; bh=+aw7U+mPGyyIrnXa9PNm0Q0W2Q65jpN/hN/rR612pPc=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=QpUCABUHgb5yntK+RcSqbq+g5H6VtMPtoHodmgSnbJbt+CLA1RyCrOAnVomiyUL38yQZTKwHB2Bq8Q6hY/bPwgA9RLtcCCcFP+T80sDYm6XovmDmHjSnsuKqJUiFrhj4HGZKC5IVcRZbhnX89mbmuTOzVKIsVYRyeHH9atL8rNg= 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=hbG4V3kt; 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="hbG4V3kt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1712650299; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=89xpcFLgtVH4lcATuVDEdqCce7EFZbuNNRadjDj3dIM=; b=hbG4V3kt6TWsMygWs75e+enp+t8m/Q9aXrOoZK8+ykchB7WEZYrzzZgMaS1Od5DoKZZmR5NytJZTPlkKr6LSvPmvtUheUfQz0FJy8Rwz/uD7DU7ScuJHuq2i6fAOHC9nC7TnT64iP37+P+RMhTN4o9MHQo9kRffe9OZL9FoT2tM= 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=ay29a033018045192;MF=hongzhen@linux.alibaba.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---0W4DtF.b_1712650297; Received: from localhost(mailfrom:hongzhen@linux.alibaba.com fp:SMTPD_---0W4DtF.b_1712650297) by smtp.aliyun-inc.com; Tue, 09 Apr 2024 16:11:38 +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 Subject: [PATCH] erofs: derive fsid from on-disk UUID for .statfs() if possible Date: Tue, 9 Apr 2024 16:11:35 +0800 Message-Id: <20240409081135.6102-1-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. Signed-off-by: Hongzhen Luo Reviewed-by: Gao Xiang Reviewed-by: Jingbo Xu --- 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..83bd8ee3b5ba 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((__u8 *)&sb->s_uuid); return 0; } =20 --=20 2.37.1