From patchwork Mon Sep 26 23:18:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Rosenberg X-Patchwork-Id: 12989537 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15F01C6FA92 for ; Mon, 26 Sep 2022 23:19:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231308AbiIZXTx (ORCPT ); Mon, 26 Sep 2022 19:19:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230493AbiIZXTG (ORCPT ); Mon, 26 Sep 2022 19:19:06 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0B03D70FD for ; Mon, 26 Sep 2022 16:18:56 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id w14-20020a170902e88e00b00177ab7a12f6so5174105plg.16 for ; Mon, 26 Sep 2022 16:18:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date; bh=X+V+rjagupOsGXK+w8MXna7CMidJPhkAi0fk+lgEZBA=; b=qv/E5vXFkhxR5QvPGwvWrChHYpzqYXWbpF5AvuxhD5oW4WHxmmI1OPCK+zVLccyxpQ 70P8uKQVe9p+jjCPGgpYYluyB7Bs8yFtj7IiCTWYB8eN+RBfa/8JMPdDzn8RQ/JSWk6h bAFUWLI3gTXLm9A9xnGHDKGD4PXFm6Zabyn0X+K27UzGDN0+OSKnlGj/eEFTadNo3C8K 49J1NwErtoUzVemb2sqAwCTQI/2Zwd5Ow4yP8MiEF3KXhFks30uWXD/KrpVQaGcaAxZs pPLLVaggu7osT/b8guwSgxWhd5j2+t2/PVd10x1ED46DEdwTvFngr4k7OGCcZvF3tuDq +JgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date; bh=X+V+rjagupOsGXK+w8MXna7CMidJPhkAi0fk+lgEZBA=; b=Gjy8j9t8phoYbhlj7XTmCJXClrKkRnvLnyDABPyLVvDj+nz2Jf0U9iPvTtpXfP3lQu WclmHNpecYDGPmYEwB3qcM8gRNPJfLdAu/2FsDxxwT7u+NL6cYP4TF2Zfi783OaujYJD FWa8p+ZRAz50Es2IzjvE7PhAzNvyRAG90qcBW/4ZpXgT4MgYPL6s+Rhou/rBMQ7jr6pF i/g2Qy9vjqpuVU9arCgaJUCLukDRfPXzh1JdutrHcLxlXDGKRV3YkjqicSix44B84j5Q L5xz0CDSIRzoBTd5QvCXqv4gYzt8h1jsaFBQLmm9VLPLi9fOr2NgMx8a222utVd1kgfJ yDfQ== X-Gm-Message-State: ACrzQf1Qd1d+y1L/F9sYXl1VW5AZzbskC5qSttdWYFu5a0M+8oyCRaCr N9RpFA9nk1qJrSbG0UhEJaH4RbgbfyU= X-Google-Smtp-Source: AMsMyM7OXl+IFw2HF4iotZxmOMrRMbE3M4zRYrR3Z0qM/C0QTbRpWqi6Mvvu2NO8Sm0yQmskBLjtHPmCpSk= X-Received: from drosen.mtv.corp.google.com ([2620:15c:211:200:4643:a68e:2b7:f873]) (user=drosen job=sendgmr) by 2002:a62:1c8f:0:b0:537:2284:bd00 with SMTP id c137-20020a621c8f000000b005372284bd00mr26113356pfc.78.1664234336158; Mon, 26 Sep 2022 16:18:56 -0700 (PDT) Date: Mon, 26 Sep 2022 16:18:06 -0700 In-Reply-To: <20220926231822.994383-1-drosen@google.com> Mime-Version: 1.0 References: <20220926231822.994383-1-drosen@google.com> X-Mailer: git-send-email 2.37.3.998.g577e59143f-goog Message-ID: <20220926231822.994383-11-drosen@google.com> Subject: [PATCH 10/26] fuse-bpf: Partially add mapping support From: Daniel Rosenberg To: Miklos Szeredi , Alexei Starovoitov , Daniel Borkmann , John Fastabend Cc: Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Daniel Rosenberg , Paul Lawrence , Alessio Balsini , David Anderson , Sandeep Patil , linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, kernel-team@android.com Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This adds a backing implementation for mapping, but no bpf counterpart yet. Signed-off-by: Daniel Rosenberg Signed-off-by: Paul Lawrence --- fs/fuse/backing.c | 37 +++++++++++++++++++++++++++++++++++++ fs/fuse/file.c | 6 ++++++ fs/fuse/fuse_i.h | 3 +++ 3 files changed, 46 insertions(+) diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c index 51088701e7ad..fa8805e24061 100644 --- a/fs/fuse/backing.c +++ b/fs/fuse/backing.c @@ -77,6 +77,43 @@ int parse_fuse_entry_bpf(struct fuse_entry_bpf *feb) return err; } +ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma) +{ + int ret; + struct fuse_file *ff = file->private_data; + struct inode *fuse_inode = file_inode(file); + struct file *backing_file = ff->backing_file; + struct inode *backing_inode = file_inode(backing_file); + + if (!backing_file->f_op->mmap) + return -ENODEV; + + if (WARN_ON(file != vma->vm_file)) + return -EIO; + + vma->vm_file = get_file(backing_file); + + ret = call_mmap(vma->vm_file, vma); + + if (ret) + fput(backing_file); + else + fput(file); + + if (file->f_flags & O_NOATIME) + return ret; + + if ((!timespec64_equal(&fuse_inode->i_mtime, &backing_inode->i_mtime) || + !timespec64_equal(&fuse_inode->i_ctime, + &backing_inode->i_ctime))) { + fuse_inode->i_mtime = backing_inode->i_mtime; + fuse_inode->i_ctime = backing_inode->i_ctime; + } + touch_atime(&file->f_path); + + return ret; +} + /******************************************************************************* * Directory operations after here * ******************************************************************************/ diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 4fa2ebc068f0..138890eae07c 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2452,6 +2452,12 @@ static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) if (FUSE_IS_DAX(file_inode(file))) return fuse_dax_mmap(file, vma); +#ifdef CONFIG_FUSE_BPF + /* TODO - this is simply passthrough, not a proper BPF filter */ + if (ff->backing_file) + return fuse_backing_mmap(file, vma); +#endif + if (ff->open_flags & FOPEN_DIRECT_IO) { /* Can't provide the coherency needed for MAP_SHARED */ if (vma->vm_flags & VM_MAYSHARE) diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 30ddc298fb27..a9653f71c145 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1404,8 +1404,11 @@ struct fuse_entry_bpf { struct bpf_prog *bpf; }; + int parse_fuse_entry_bpf(struct fuse_entry_bpf *feb); +ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma); + struct fuse_lookup_io { struct fuse_entry_out feo; struct fuse_entry_bpf feb;