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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 BF2EDC3A5A0 for ; Wed, 21 Aug 2019 17:59:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DF24233A0 for ; Wed, 21 Aug 2019 17:59:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728050AbfHUR7D (ORCPT ); Wed, 21 Aug 2019 13:59:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38972 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729766AbfHUR5i (ORCPT ); Wed, 21 Aug 2019 13:57:38 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B8E92A2F6B6; Wed, 21 Aug 2019 17:57:38 +0000 (UTC) Received: from horse.redhat.com (unknown [10.18.25.158]) by smtp.corp.redhat.com (Postfix) with ESMTP id 914E617D29; Wed, 21 Aug 2019 17:57:38 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id AD0DF223D06; Wed, 21 Aug 2019 13:57:32 -0400 (EDT) From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Cc: virtio-fs@redhat.com, vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, Peng Tao Subject: [PATCH 10/19] fuse: Introduce setupmapping/removemapping commands Date: Wed, 21 Aug 2019 13:57:11 -0400 Message-Id: <20190821175720.25901-11-vgoyal@redhat.com> In-Reply-To: <20190821175720.25901-1-vgoyal@redhat.com> References: <20190821175720.25901-1-vgoyal@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.68]); Wed, 21 Aug 2019 17:57:38 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Introduce two new fuse commands to setup/remove memory mappings. This will be used to setup/tear down file mapping in dax window. Signed-off-by: Vivek Goyal Signed-off-by: Peng Tao --- include/uapi/linux/fuse.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index 4461fd640cf2..7c2ad3d418df 100644 --- a/include/uapi/linux/fuse.h +++ b/include/uapi/linux/fuse.h @@ -426,6 +426,8 @@ enum fuse_opcode { FUSE_RENAME2 = 45, FUSE_LSEEK = 46, FUSE_COPY_FILE_RANGE = 47, + FUSE_SETUPMAPPING = 48, + FUSE_REMOVEMAPPING = 49, /* CUSE specific operations */ CUSE_INIT = 4096, @@ -850,4 +852,41 @@ struct fuse_copy_file_range_in { uint64_t flags; }; +#define FUSE_SETUPMAPPING_ENTRIES 8 +#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0) +struct fuse_setupmapping_in { + /* An already open handle */ + uint64_t fh; + /* Offset into the file to start the mapping */ + uint64_t foffset; + /* Length of mapping required */ + uint64_t len; + /* Flags, FUSE_SETUPMAPPING_FLAG_* */ + uint64_t flags; + /* Offset in Memory Window */ + uint64_t moffset; +}; + +struct fuse_setupmapping_out { + /* Offsets into the cache of mappings */ + uint64_t coffset[FUSE_SETUPMAPPING_ENTRIES]; + /* Lengths of each mapping */ + uint64_t len[FUSE_SETUPMAPPING_ENTRIES]; +}; + +struct fuse_removemapping_in { + /* number of fuse_removemapping_one follows */ + uint32_t count; +}; + +struct fuse_removemapping_one { + /* Offset into the dax window start the unmapping */ + uint64_t moffset; + /* Length of mapping required */ + uint64_t len; +}; + +#define FUSE_REMOVEMAPPING_MAX_ENTRY \ + (PAGE_SIZE / sizeof(struct fuse_removemapping_one)) + #endif /* _LINUX_FUSE_H */ -- 2.20.1