From nobody Tue Feb 10 12:40:44 2026 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 40CEBEB64D8 for ; Tue, 20 Jun 2023 15:15:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233743AbjFTPP2 (ORCPT ); Tue, 20 Jun 2023 11:15:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233704AbjFTPOg (ORCPT ); Tue, 20 Jun 2023 11:14:36 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A0C01997 for ; Tue, 20 Jun 2023 08:14:12 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id 41be03b00d2f7-54fd6aa3b0dso2501859a12.2 for ; Tue, 20 Jun 2023 08:14:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1687274049; x=1689866049; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=h4+x+nHT/B45E7UNnOquSwSO/h9YI0Q8rRdwe69B63Q=; b=RqtNAe1RFUQMvzoORbX6DkZQi3UCv6ODu+PrzEzpYSbBftvYU2zYVD47PcImmkCIe7 BKQM7uPqi2PLFoKjz6oKM07HnmCNSiGOM9BPK6LGvIHrdADRMqW3EA7bHIQlaSA4aCaH K4ZagfAuaP18sbIGdxUoH2jYTicucMLlHh5Hc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687274049; x=1689866049; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=h4+x+nHT/B45E7UNnOquSwSO/h9YI0Q8rRdwe69B63Q=; b=SZROvFgdAqlOg8/DNIdiquQrtReH3PVkRuZaWDT2Ypub4y/5CpbR68tRQlJWl/McRk KAfR5rZ/B6lTjYGIvY0bpGjI8xQhLUbOxPKeCUalDrsbnzXOo1NtvoT4dThR1tIciTPC DWIc/pY8gLfaqTit49rJ8rF/3mlmqkladt1065nLad/XLHB1f7ux/tEx7GfDr+Me4azs W9ergNXFhpi9fU9QNli1CQW9aC74pM4mlLSbvR5/ovIh6UX+6K/N9beDzhdO6aWCLvPn WgnRWC3/B5KsIbMmSbSYVZ/DAgx93sVWcJ62ocXM5bsj+5GKepS+55ScWGSqOTDcDGsg iHwA== X-Gm-Message-State: AC+VfDwwjzIvXl9hblbX8WFHSEaMYlS1A5xe2IxGMEsKqIlNJJLBnfl9 zWoLyyxQ60QfSmiyFU81GrFZh8+bdzWt7qdT8Ss= X-Google-Smtp-Source: ACHHUZ7Rq928JI13B91Bwvj3KipWu3jBQaQgSh0KVxwME+Q4LkNUZdGe807jnxk5uiZldi6heglgvQ== X-Received: by 2002:a17:903:124e:b0:1b1:dfbd:a18c with SMTP id u14-20020a170903124e00b001b1dfbda18cmr8932980plh.39.1687274048672; Tue, 20 Jun 2023 08:14:08 -0700 (PDT) Received: from keiichiw1.tok.corp.google.com ([2401:fa00:8f:203:e87e:41e3:d762:f8a8]) by smtp.gmail.com with ESMTPSA id x9-20020a170902ec8900b001aaf370b1c7sm1731872plg.278.2023.06.20.08.14.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jun 2023 08:14:08 -0700 (PDT) From: Keiichi Watanabe To: LKML Cc: mhiramat@google.com, takayas@chromium.org, drosen@google.com, sarthakkukreti@google.com, uekawa@chromium.org, Keiichi Watanabe , Jonathan Corbet , Miklos Szeredi , Stefan Hajnoczi , Vivek Goyal , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH 3/3] virtiofs: Add negative_dentry_timeout option Date: Wed, 21 Jun 2023 00:13:16 +0900 Message-ID: <20230620151328.1637569-4-keiichiw@chromium.org> X-Mailer: git-send-email 2.41.0.185.g7c58973941-goog In-Reply-To: <20230620151328.1637569-1-keiichiw@chromium.org> References: <20230620151328.1637569-1-keiichiw@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add negative_dentry_timeout mount option to virtiofs to caching negative dentry on the guest side. When the host virito-fs device has an exclusive access to the file system and the machine has enough memory, one can specify a long time as the timeout. This option saves ~1 second per 10,000 stat request for non-existing paths. Signed-off-by: Keiichi Watanabe --- Documentation/filesystems/virtiofs.rst | 4 ++++ fs/fuse/virtio_fs.c | 8 ++++++++ 2 files changed, 12 insertions(+) diff --git a/Documentation/filesystems/virtiofs.rst b/Documentation/filesys= tems/virtiofs.rst index fdec5a7840f7..b045ef2223de 100644 --- a/Documentation/filesystems/virtiofs.rst +++ b/Documentation/filesystems/virtiofs.rst @@ -48,6 +48,10 @@ ro, rw, context, etc. Also, virtiofs has its own options. dax[=3Dalways,never,inode] Enable direct access for files. See :ref:`virtiofs-dax`. =20 +negative_dentry_timeout=3DN + Set the time in seconds to keep negative dentry cache. Same as the FUSE's + mount option. + atime behavior ^^^^^^^^^^^^^^ =20 diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index 4d8d4f16c727..bbbd840510f9 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -99,11 +99,13 @@ static const struct constant_table dax_param_enums[] = =3D { enum { OPT_DAX, OPT_DAX_ENUM, + OPT_NEGATIVE_DENTRY_TIMEOUT, }; =20 static const struct fs_parameter_spec virtio_fs_parameters[] =3D { fsparam_flag("dax", OPT_DAX), fsparam_enum("dax", OPT_DAX_ENUM, dax_param_enums), + fsparam_u32 ("negative_dentry_timeout", OPT_NEGATIVE_DENTRY_TIMEOUT), {} }; =20 @@ -125,6 +127,9 @@ static int virtio_fs_parse_param(struct fs_context *fsc, case OPT_DAX_ENUM: ctx->dax_mode =3D result.uint_32; break; + case OPT_NEGATIVE_DENTRY_TIMEOUT: + ctx->negative_dentry_timeout =3D result.uint_32; + break; default: return -EINVAL; } @@ -1416,6 +1421,7 @@ static int virtio_fs_get_tree(struct fs_context *fsc) struct super_block *sb; struct fuse_conn *fc =3D NULL; struct fuse_mount *fm; + struct fuse_fs_context *ffc; unsigned int virtqueue_size; int err =3D -EIO; =20 @@ -1468,6 +1474,8 @@ static int virtio_fs_get_tree(struct fs_context *fsc) =20 sb->s_flags |=3D SB_ACTIVE; } + ffc =3D fsc->fs_private; + fm->negative_dentry_timeout =3D ffc->negative_dentry_timeout; =20 WARN_ON(fsc->root); fsc->root =3D dget(sb->s_root); --=20 2.41.0.185.g7c58973941-goog