From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:39829 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728655AbeLJRNv (ORCPT ); Mon, 10 Dec 2018 12:13:51 -0500 From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com Subject: [PATCH 24/52] fuse: Introduce setupmapping/removemapping commands Date: Mon, 10 Dec 2018 12:12:50 -0500 Message-Id: <20181210171318.16998-25-vgoyal@redhat.com> In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com> References: <20181210171318.16998-1-vgoyal@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Introduce two new fuse commands to setup/remove memory mappings. Signed-off-by: Vivek Goyal --- include/uapi/linux/fuse.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index b4967d48bfda..867fdafc4a5e 100644 --- a/include/uapi/linux/fuse.h +++ b/include/uapi/linux/fuse.h @@ -394,6 +394,8 @@ 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, @@ -817,4 +819,35 @@ 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 { + /* An already open handle */ + uint64_t fh; + /* Offset into the dax window start the unmapping */ + uint64_t moffset; + /* Length of mapping required */ + uint64_t len; +}; + #endif /* _LINUX_FUSE_H */ -- 2.13.6