From patchwork Tue Jun 15 06:41:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: jzp0409 X-Patchwork-Id: 12320667 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9BF4CC48BDF for ; Tue, 15 Jun 2021 06:42:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 80F2561419 for ; Tue, 15 Jun 2021 06:42:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230060AbhFOGoD (ORCPT ); Tue, 15 Jun 2021 02:44:03 -0400 Received: from m12-16.163.com ([220.181.12.16]:60471 "EHLO m12-16.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229960AbhFOGoC (ORCPT ); Tue, 15 Jun 2021 02:44:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=zDFMU pcM0iFsbvJpRwSkNP93HHPNlE4oSqJBlAUDPlk=; b=W6Qruxugt1uG8DvcNRSCh WQkmBaT0craSB2a0kpColyFNZ2weURMjH45I2x9ToB/xxXqPmO2SKH7R8h5Bi/U5 ki5eukc3tzyI9YleXFdOY180o6UFpGvN+4mmuEa1fh93WM2kM/vK4rXedkoqeOfk 2tP5OAk+96xgWNTUyTGcPk= Received: from jiangzhipeng.ccdomain.com (unknown [218.94.48.178]) by smtp12 (Coremail) with SMTP id EMCowACHnlqsS8hgqPq7xQ--.51904S2; Tue, 15 Jun 2021 14:41:54 +0800 (CST) From: jzp0409 To: miklos@szeredi.hu Cc: linux-fsdevel@vger.kernel.org, "edison.jiang" Subject: [PATCH] fuse: set limit size Date: Tue, 15 Jun 2021 14:41:55 +0800 Message-Id: <20210615064155.911-1-jzp0409@163.com> X-Mailer: git-send-email 2.30.0.windows.2 MIME-Version: 1.0 X-CM-TRANSID: EMCowACHnlqsS8hgqPq7xQ--.51904S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7ZF4rKrykuw4fXr15Cw1DGFg_yoW8Gry5pF nruFWrJrZFqFWxGr1Sgr17Way5K3yFyF4jgFWfZa12vr15Xr9IkF93ZFWkW3y5ur4kZw1Y y3sxKr1rursrt3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07U-Vy3UUUUU= X-Originating-IP: [218.94.48.178] X-CM-SenderInfo: hm2sikiqz6il2tof0z/xtbBiBKyhlaD-TZ0twAAsz Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: "edison.jiang" Android-R /sdcard mount FUSE filesystem type, use "dd" command to filli up /sdcard dir, Android will not boot normal, becase this system need at least 128M userspace. Test: open adb port, adb shell "dd if=dev/zero of=sdcard/ae bs=1024000 count=xxx" Result: if not limit size,Android system can not boot normal. Signed-off-by: edison.jiang --- fs/fuse/inode.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index b0e18b4..f4e54505 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -477,6 +477,21 @@ static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr stbuf->f_files = attr->files; stbuf->f_ffree = attr->ffree; stbuf->f_namelen = attr->namelen; +#ifdef LIMIT_SDCARD_SIZE + u32 data_free_size_th = 128*1024*1024; + + stbuf->f_blocks -= (u32)data_free_size_th/attr->bsize; + + if (stbuf->f_bfree < ((u32)data_free_size_th/attr->bsize)) + stbuf->f_bfree = 0; + else + stbuf->f_bfree -= (u32)data_free_size_th/attr->bsize; + + if (stbuf->f_bavail < ((u32)data_free_size_th/attr->bsize)) + stbuf->f_bavail = 0; + else + stbuf->f_bavail -= (u32)data_free_size_th/attr->bsize; +#endif /* fsid is left zero */ }