From nobody Sun Apr 5 13:09:11 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AEFEEECAAD3 for ; Wed, 14 Sep 2022 10:52:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230043AbiINKwB (ORCPT ); Wed, 14 Sep 2022 06:52:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230014AbiINKvc (ORCPT ); Wed, 14 Sep 2022 06:51:32 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 313177D7BA for ; Wed, 14 Sep 2022 03:51:10 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id fv3so14193394pjb.0 for ; Wed, 14 Sep 2022 03:51:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=IrNJXJy2Qfp61vWuuO+NXKEK9HBiciqOqk0BOw7bdEk=; b=HuHz/O1NbGKWuzT134PJzmW4zHJ9Ig1Ewm9e5IpSywIIu5wXuE418wYKvpALrR6v4I RN7Z37cPxS3wS5zFO6uzGT3yNiNRagQ4W+L73PwsPmemfYytu9gHuLZRgDmBMwTI9TJ0 iH3rFVMW/PKg1BmZYzFycEtLWDXQYrdei2lIymMgw3CRgq/DpZSy0zCoMqzMBADF/Owa aYwO67wj1v8KhA+8mM4bfl1/Mc8MD7ljvNR2qDE+cIHud8tu/dXFyzZybV+KuBWKKRv4 afZKFGtzDMxVMR8d89LGYr9MPzfdKnwNBxhBd0q4iwTveTZpe2edFeJh5taI+rOnGtOf vZ+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=IrNJXJy2Qfp61vWuuO+NXKEK9HBiciqOqk0BOw7bdEk=; b=OXjktUZWa/o0GwnO+O9KPgX/DOi8jFWQuLx2fCJnZwc4FtN4ayTEOVL1juXHh2jAyD m6CCJ5BYacBwXeAp/TtzrEppFfOXq3ShMamoMu73lBxMc+cZlsEbgmJUIAjjnsuJnih3 HAnLwfFtWdmSWOGUjjybyL4HO1kptM1DScrGma+7R/ToWyIOFCQvnz2GK7ToiXlc1ME8 YMZcD2MSkofpgxKPwJAXgP29wTiqVxRYFk7bCF1mrut1rGMcwCBJewMunPvkugGX0ep8 jBV0okbjDl3XkV1DrZjoOvCIVqSOHyxqJFzK/pXZ5AYVinYUqb2g2XKAPhY7jTNCyMKh n59g== X-Gm-Message-State: ACgBeo3TnYiEXHBqHx7lkMxuEpIHu+hQfXfp5bS9OBkz0U/3P4FAM+ql jVreaiFJ+JgS3P0FL4eOtVN6Vw== X-Google-Smtp-Source: AA6agR7zIf6cTNMutEmLYBBSDrMiX8sfjaJDTX66cNjrRwG7LFaLG1XSqM4sbjMoWE5vt1C4y9Ht1g== X-Received: by 2002:a17:902:c944:b0:178:4568:9f99 with SMTP id i4-20020a170902c94400b0017845689f99mr8157121pla.98.1663152669412; Wed, 14 Sep 2022 03:51:09 -0700 (PDT) Received: from C02G705SMD6V.bytedance.net ([2400:8800:1f02:83:4000:0:1:2]) by smtp.gmail.com with ESMTPSA id x13-20020a170902ec8d00b0016dc2366722sm10537042plg.77.2022.09.14.03.51.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Sep 2022 03:51:09 -0700 (PDT) From: Jia Zhu To: linux-erofs@lists.ozlabs.org, xiang@kernel.org, chao@kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, yinxin.x@bytedance.com, jefflexu@linux.alibaba.com, huyue2@coolpad.com, Jia Zhu Subject: [PATCH V3 5/6] erofs: introduce a pseudo mnt to manage shared cookies Date: Wed, 14 Sep 2022 18:50:40 +0800 Message-Id: <20220914105041.42970-6-zhujia.zj@bytedance.com> X-Mailer: git-send-email 2.37.0 (Apple Git-136) In-Reply-To: <20220914105041.42970-1-zhujia.zj@bytedance.com> References: <20220914105041.42970-1-zhujia.zj@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use a pseudo mnt to manage shared cookies. Signed-off-by: Jia Zhu --- fs/erofs/fscache.c | 13 +++++++++++++ fs/erofs/internal.h | 1 + fs/erofs/super.c | 31 +++++++++++++++++++++++++++++-- 3 files changed, 43 insertions(+), 2 deletions(-) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index b2100dc67cde..4e0a441afb7d 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -8,6 +8,7 @@ =20 static DEFINE_MUTEX(erofs_domain_list_lock); static LIST_HEAD(erofs_domain_list); +static struct vfsmount *erofs_pseudo_mnt; =20 static struct netfs_io_request *erofs_fscache_alloc_request(struct address= _space *mapping, loff_t start, size_t len) @@ -436,6 +437,10 @@ static void erofs_fscache_domain_put(struct erofs_doma= in *domain) fscache_relinquish_volume(domain->volume, NULL, false); mutex_lock(&erofs_domain_list_lock); list_del(&domain->list); + if (list_empty(&erofs_domain_list)) { + kern_unmount(erofs_pseudo_mnt); + erofs_pseudo_mnt =3D NULL; + } mutex_unlock(&erofs_domain_list_lock); kfree(domain->domain_id); kfree(domain); @@ -489,6 +494,14 @@ static int erofs_fscache_init_domain(struct super_bloc= k *sb) if (err) goto out; =20 + if (!erofs_pseudo_mnt) { + erofs_pseudo_mnt =3D kern_mount(&erofs_fs_type); + if (IS_ERR(erofs_pseudo_mnt)) { + err =3D PTR_ERR(erofs_pseudo_mnt); + goto out; + } + } + domain->volume =3D sbi->volume; refcount_set(&domain->ref, 1); mutex_init(&domain->mutex); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 5ce6889d6f1d..4dd0b545755a 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -403,6 +403,7 @@ struct page *erofs_grab_cache_page_nowait(struct addres= s_space *mapping, } =20 extern const struct super_operations erofs_sops; +extern struct file_system_type erofs_fs_type; =20 extern const struct address_space_operations erofs_raw_access_aops; extern const struct address_space_operations z_erofs_aops; diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 856758ee4869..ced1d2fd6e4b 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -688,6 +688,13 @@ static const struct export_operations erofs_export_ops= =3D { .get_parent =3D erofs_get_parent, }; =20 +static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_co= ntext *fc) +{ + static const struct tree_descr empty_descr =3D {""}; + + return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr); +} + static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *= fc) { struct inode *inode; @@ -789,6 +796,11 @@ static int erofs_fc_fill_super(struct super_block *sb,= struct fs_context *fc) return 0; } =20 +static int erofs_fc_anon_get_tree(struct fs_context *fc) +{ + return get_tree_nodev(fc, erofs_fc_fill_pseudo_super); +} + static int erofs_fc_get_tree(struct fs_context *fc) { struct erofs_fs_context *ctx =3D fc->fs_private; @@ -858,10 +870,20 @@ static const struct fs_context_operations erofs_conte= xt_ops =3D { .free =3D erofs_fc_free, }; =20 +static const struct fs_context_operations erofs_anon_context_ops =3D { + .get_tree =3D erofs_fc_anon_get_tree, +}; + static int erofs_init_fs_context(struct fs_context *fc) { - struct erofs_fs_context *ctx =3D kzalloc(sizeof(*ctx), GFP_KERNEL); + struct erofs_fs_context *ctx; + + if (fc->sb_flags & SB_KERNMOUNT) { + fc->ops =3D &erofs_anon_context_ops; + return 0; + } =20 + ctx =3D kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->devs =3D kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL); @@ -888,6 +910,11 @@ static void erofs_kill_sb(struct super_block *sb) =20 WARN_ON(sb->s_magic !=3D EROFS_SUPER_MAGIC); =20 + if (sb->s_flags & SB_KERNMOUNT) { + kill_litter_super(sb); + return; + } + if (erofs_is_fscache_mode(sb)) kill_anon_super(sb); else @@ -923,7 +950,7 @@ static void erofs_put_super(struct super_block *sb) sbi->s_fscache =3D NULL; } =20 -static struct file_system_type erofs_fs_type =3D { +struct file_system_type erofs_fs_type =3D { .owner =3D THIS_MODULE, .name =3D "erofs", .init_fs_context =3D erofs_init_fs_context, --=20 2.20.1