From patchwork Wed Aug 19 22:19:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 11725093 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3690115E4 for ; Wed, 19 Aug 2020 22:21:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F9DE20758 for ; Wed, 19 Aug 2020 22:21:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="c6srp9bI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727911AbgHSWVL (ORCPT ); Wed, 19 Aug 2020 18:21:11 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:53783 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727808AbgHSWVG (ORCPT ); Wed, 19 Aug 2020 18:21:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1597875665; 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=dhhImXPnKE/TEMGqzlPA1Cua+wWRIpTLBP1xil+eIs0=; b=c6srp9bIdZEcFaxEAHnbQM2UZBOdVzuY/pUvb2S5LquB5s/XFuS3q4zxAjo2NlNuVTkERO O6GY8Als+fJN2gJm080Jts3GqopzBu13iIcY9ny1y++CL0NltBGH+cXeWSboN/U0oXIptb hMO8EIdovYuYt4w3v9+EFejXpQw1k+0= 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-341-c85V9tnhNDOlX6ri_eHQOA-1; Wed, 19 Aug 2020 18:21:03 -0400 X-MC-Unique: c85V9tnhNDOlX6ri_eHQOA-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 5503F1885D84; Wed, 19 Aug 2020 22:21:02 +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 353F95C1DC; Wed, 19 Aug 2020 22:21:02 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 427532256EF; 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 17/18] fuse,virtiofs: Maintain a list of busy elements Date: Wed, 19 Aug 2020 18:19:55 -0400 Message-Id: <20200819221956.845195-18-vgoyal@redhat.com> In-Reply-To: <20200819221956.845195-1-vgoyal@redhat.com> References: <20200819221956.845195-1-vgoyal@redhat.com> MIME-Version: 1.0 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 This list will be used selecting fuse_dax_mapping to free when number of free mappings drops below a threshold. Signed-off-by: Vivek Goyal --- fs/fuse/file.c | 22 ++++++++++++++++++++++ fs/fuse/fuse_i.h | 7 +++++++ fs/fuse/inode.c | 4 ++++ 3 files changed, 33 insertions(+) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index aaa57c625af7..723602813ad6 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -213,6 +213,23 @@ static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn *fc) return dmap; } +/* This assumes fc->lock is held */ +static void __dmap_remove_busy_list(struct fuse_conn *fc, + struct fuse_dax_mapping *dmap) +{ + list_del_init(&dmap->busy_list); + WARN_ON(fc->nr_busy_ranges == 0); + fc->nr_busy_ranges--; +} + +static void dmap_remove_busy_list(struct fuse_conn *fc, + struct fuse_dax_mapping *dmap) +{ + spin_lock(&fc->lock); + __dmap_remove_busy_list(fc, dmap); + spin_unlock(&fc->lock); +} + /* This assumes fc->lock is held */ static void __dmap_add_to_free_pool(struct fuse_conn *fc, struct fuse_dax_mapping *dmap) @@ -266,6 +283,10 @@ static int fuse_setup_one_mapping(struct inode *inode, unsigned long start_idx, /* Protected by fi->i_dmap_sem */ interval_tree_insert(&dmap->itn, &fi->dmap_tree); fi->nr_dmaps++; + spin_lock(&fc->lock); + list_add_tail(&dmap->busy_list, &fc->busy_ranges); + fc->nr_busy_ranges++; + spin_unlock(&fc->lock); } return 0; } @@ -335,6 +356,7 @@ static void dmap_reinit_add_to_free_pool(struct fuse_conn *fc, pr_debug("fuse: freeing memory range start_idx=0x%lx end_idx=0x%lx " "window_offset=0x%llx length=0x%llx\n", dmap->itn.start, dmap->itn.last, dmap->window_offset, dmap->length); + __dmap_remove_busy_list(fc, dmap); dmap->itn.start = dmap->itn.last = 0; __dmap_add_to_free_pool(fc, dmap); } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index e555c9a33359..400a19a464ca 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -80,6 +80,9 @@ struct fuse_dax_mapping { /* For interval tree in file/inode */ struct interval_tree_node itn; + /* Will connect in fc->busy_ranges to keep track busy memory */ + struct list_head busy_list; + /** Position in DAX window */ u64 window_offset; @@ -812,6 +815,10 @@ struct fuse_conn { /** DAX device, non-NULL if DAX is supported */ struct dax_device *dax_dev; + /* List of memory ranges which are busy */ + unsigned long nr_busy_ranges; + struct list_head busy_ranges; + /* * DAX Window Free Ranges */ diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 3735bc5fdfa2..671e84e3dd99 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -636,6 +636,8 @@ static void fuse_free_dax_mem_ranges(struct list_head *mem_list) /* Free All allocated elements */ list_for_each_entry_safe(range, temp, mem_list, list) { list_del(&range->list); + if (!list_empty(&range->busy_list)) + list_del(&range->busy_list); kfree(range); } } @@ -680,6 +682,7 @@ static int fuse_dax_mem_range_init(struct fuse_conn *fc, */ range->window_offset = i * FUSE_DAX_SZ; range->length = FUSE_DAX_SZ; + INIT_LIST_HEAD(&range->busy_list); list_add_tail(&range->list, &mem_ranges); } @@ -727,6 +730,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns, fc->user_ns = get_user_ns(user_ns); fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; INIT_LIST_HEAD(&fc->free_ranges); + INIT_LIST_HEAD(&fc->busy_ranges); } EXPORT_SYMBOL_GPL(fuse_conn_init);