From mboxrd@z Thu Jan 1 00:00:00 1970 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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY autolearn=unavailable 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 06878C433DF for ; Wed, 19 Aug 2020 22:22:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D87CA2076E for ; Wed, 19 Aug 2020 22:22:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QJowQYhq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728006AbgHSWW0 (ORCPT ); Wed, 19 Aug 2020 18:22:26 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:56753 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727888AbgHSWVK (ORCPT ); Wed, 19 Aug 2020 18:21:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1597875668; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3r9Ws0y/w/73f6Yi8dzj7Ayu3FnCAIQyynyIBB67ZrI=; b=QJowQYhqiCXHLQ8zwPYJAFXdpzex1S7f4/TTLjtbCDTf4UH0rz/xaaO2A1hNs9d589P/Ja GicOgjDfNl83/Zn41QEq4xY33csOT0QJ2WUVu+CdTKXlgMqMkMIn9XJmyHMms3y+Rn3gpo //b7BZVHVHVg2OnPiU4RjLfyQBNfaMk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-50-GglbAcrKMWOfk_Pf1lgtbQ-1; Wed, 19 Aug 2020 18:21:06 -0400 X-MC-Unique: GglbAcrKMWOfk_Pf1lgtbQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 929921007475; Wed, 19 Aug 2020 22:21:04 +0000 (UTC) Received: from horse.redhat.com (ovpn-115-197.rdu2.redhat.com [10.10.115.197]) by smtp.corp.redhat.com (Postfix) with ESMTP id D4C575C70C; Wed, 19 Aug 2020 22:21:01 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 1BEEC2256EC; Wed, 19 Aug 2020 18:20:54 -0400 (EDT) From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, virtio-fs@redhat.com Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, dan.j.williams@intel.com Subject: [PATCH v3 14/18] fuse,dax: add DAX mmap support Date: Wed, 19 Aug 2020 18:19:52 -0400 Message-Id: <20200819221956.845195-15-vgoyal@redhat.com> In-Reply-To: <20200819221956.845195-1-vgoyal@redhat.com> References: <20200819221956.845195-1-vgoyal@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Stefan Hajnoczi Add DAX mmap() support. Signed-off-by: Stefan Hajnoczi --- fs/fuse/file.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 61 insertions(+), 1 deletion(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 99457d0b14b9..f1ad8b95b546 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2841,10 +2841,15 @@ static const struct vm_operations_struct fuse_file_vm_ops = { .page_mkwrite = fuse_page_mkwrite, }; +static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma); static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) { struct fuse_file *ff = file->private_data; + /* DAX mmap is superior to direct_io mmap */ + if (IS_DAX(file_inode(file))) + return fuse_dax_mmap(file, vma); + if (ff->open_flags & FOPEN_DIRECT_IO) { /* Can't provide the coherency needed for MAP_SHARED */ if (vma->vm_flags & VM_MAYSHARE) @@ -2863,9 +2868,63 @@ static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) return 0; } +static vm_fault_t __fuse_dax_fault(struct vm_fault *vmf, + enum page_entry_size pe_size, bool write) +{ + vm_fault_t ret; + struct inode *inode = file_inode(vmf->vma->vm_file); + struct super_block *sb = inode->i_sb; + pfn_t pfn; + + if (write) + sb_start_pagefault(sb); + + ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL, &fuse_iomap_ops); + + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); + + if (write) + sb_end_pagefault(sb); + + return ret; +} + +static vm_fault_t fuse_dax_fault(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, + vmf->flags & FAULT_FLAG_WRITE); +} + +static vm_fault_t fuse_dax_huge_fault(struct vm_fault *vmf, + enum page_entry_size pe_size) +{ + return __fuse_dax_fault(vmf, pe_size, vmf->flags & FAULT_FLAG_WRITE); +} + +static vm_fault_t fuse_dax_page_mkwrite(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, true); +} + +static vm_fault_t fuse_dax_pfn_mkwrite(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, true); +} + +static const struct vm_operations_struct fuse_dax_vm_ops = { + .fault = fuse_dax_fault, + .huge_fault = fuse_dax_huge_fault, + .page_mkwrite = fuse_dax_page_mkwrite, + .pfn_mkwrite = fuse_dax_pfn_mkwrite, +}; + static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma) { - return -EINVAL; /* TODO */ + file_accessed(file); + vma->vm_ops = &fuse_dax_vm_ops; + vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; + return 0; } static int convert_fuse_file_lock(struct fuse_conn *fc, @@ -3938,6 +3997,7 @@ static const struct file_operations fuse_file_operations = { .release = fuse_release, .fsync = fuse_fsync, .lock = fuse_file_lock, + .get_unmapped_area = thp_get_unmapped_area, .flock = fuse_file_flock, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, -- 2.25.4