From nobody Mon Feb 9 19:05:24 2026 Received: from canpmsgout04.his.huawei.com (canpmsgout04.his.huawei.com [113.46.200.219]) (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 394FE35FF52; Fri, 16 Jan 2026 10:08:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.219 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768558143; cv=none; b=VHb0K6jDUAe+xLEPZs4/0j9yOoWXbC5wQC0ltq5gDkyoFo4L/pkqyzRNfZHXRS5+Mmidx4BeuoihVE4JwldTakQAEayiIIbPJI5Hqni/1x6qeSw2C9rD3Mx7Hn16RaL0cTGV/nArqstWTuF7aTtyRt2oJJy4qLTnHTcXGvoRS2Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768558143; c=relaxed/simple; bh=pXnDClVRTnHHgum20VgnGGA8xY6ykQ05HoqhepeDEv4=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=c0VCyK42kLAmU67C1Gf0LPe8x4URBOaSboIddszRBdJqyd5WSjskzjlM7xPY65Ehth+rXNMtVEEToDDAAjn7wj2rDX9skxGmR4o9sT0Xn+PtL6k1oib0Wa6v0BAF6+NrUXmvbDDzG/DdjLCMg2N/ZNbWzkmV2Xk4OFQRttnkFoc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=ET4nQgDE; arc=none smtp.client-ip=113.46.200.219 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="ET4nQgDE" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=XzmAs2VpZLSxoIrsGbEfPR013qwffyPmOWZWIOJmd7w=; b=ET4nQgDEN5fYb3hoQ8vIAzZBtp6wiXUMv1NRArCFLuT2+7LbB0ZtiaUJbe4KeP8OBrpaOTNYo IOgLN5fMC0HizzauOwIRsnpx/LjDgNUINCiH08vX29OH1T+GnUoIzDWysuevgBd0crGEm8GAn+k KCC9YTjfCMoJWlJMien4q0A= Received: from mail.maildlp.com (unknown [172.19.162.144]) by canpmsgout04.his.huawei.com (SkyGuard) with ESMTPS id 4dswTF1c2Cz1prKt; Fri, 16 Jan 2026 18:05:21 +0800 (CST) Received: from kwepemr500015.china.huawei.com (unknown [7.202.195.162]) by mail.maildlp.com (Postfix) with ESMTPS id EEEB240538; Fri, 16 Jan 2026 18:08:43 +0800 (CST) Received: from huawei.com (10.67.174.162) by kwepemr500015.china.huawei.com (7.202.195.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 16 Jan 2026 18:08:43 +0800 From: Hongbo Li To: , , CC: , , , , , , Subject: [PATCH v15 9/9] erofs: implement .fadvise for page cache share Date: Fri, 16 Jan 2026 09:55:50 +0000 Message-ID: <20260116095550.627082-10-lihongbo22@huawei.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20260116095550.627082-1-lihongbo22@huawei.com> References: <20260116095550.627082-1-lihongbo22@huawei.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-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To kwepemr500015.china.huawei.com (7.202.195.162) Content-Type: text/plain; charset="utf-8" From: Hongzhen Luo This patch implements the .fadvise interface for page cache share. Similar to overlayfs, it drops those clean, unused pages through vfs_fadvise(). Signed-off-by: Hongzhen Luo Signed-off-by: Hongbo Li Reviewed-by: Gao Xiang --- fs/erofs/ishare.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c index 96679286da95..78242f9d8dde 100644 --- a/fs/erofs/ishare.c +++ b/fs/erofs/ishare.c @@ -145,6 +145,13 @@ static int erofs_ishare_mmap(struct file *file, struct= vm_area_struct *vma) return generic_file_readonly_mmap(file, vma); } =20 +static int erofs_ishare_fadvise(struct file *file, loff_t offset, + loff_t len, int advice) +{ + return vfs_fadvise((struct file *)file->private_data, + offset, len, advice); +} + const struct file_operations erofs_ishare_fops =3D { .open =3D erofs_ishare_file_open, .llseek =3D generic_file_llseek, @@ -153,6 +160,7 @@ const struct file_operations erofs_ishare_fops =3D { .release =3D erofs_ishare_file_release, .get_unmapped_area =3D thp_get_unmapped_area, .splice_read =3D filemap_splice_read, + .fadvise =3D erofs_ishare_fadvise, }; =20 struct inode *erofs_real_inode(struct inode *inode, bool *need_iput) --=20 2.22.0