From patchwork Mon Dec 27 12:54:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12699755 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 9DE01C433F5 for ; Mon, 27 Dec 2021 12:55:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237120AbhL0Mzb (ORCPT ); Mon, 27 Dec 2021 07:55:31 -0500 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]:46668 "EHLO out30-56.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232241AbhL0MzJ (ORCPT ); Mon, 27 Dec 2021 07:55:09 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04407;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=12;SR=0;TI=SMTPD_---0V.vxTKl_1640609705; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V.vxTKl_1640609705) by smtp.aliyun-inc.com(127.0.0.1); Mon, 27 Dec 2021 20:55:06 +0800 From: Jeffle Xu To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: linux-fsdevel@vger.kernel.org, joseph.qi@linux.alibaba.com, bo.liu@linux.alibaba.com, tao.peng@linux.alibaba.com, gerry@linux.alibaba.com, eguan@linux.alibaba.com, linux-kernel@vger.kernel.org Subject: [PATCH v1 18/23] cachefiles: use idr tree managing pending demand read Date: Mon, 27 Dec 2021 20:54:39 +0800 Message-Id: <20211227125444.21187-19-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211227125444.21187-1-jefflexu@linux.alibaba.com> References: <20211227125444.21187-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This is in prep for implementing .demand_read() callback for cachefiles. In the following patch, .demand_read() callback is responsible for notifying user daemon the requested file range (hole) to read. Then .demand_read() callback will get blocked until user daemon has prepared data and filled the hole. This patch introduces an idr tree to manage all these pending demand-read IO. Signed-off-by: Jeffle Xu --- fs/cachefiles/daemon.c | 3 +++ fs/cachefiles/internal.h | 4 ++++ 2 files changed, 7 insertions(+) diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c index 892a9bdba53f..01496fa8c263 100644 --- a/fs/cachefiles/daemon.c +++ b/fs/cachefiles/daemon.c @@ -118,6 +118,8 @@ static int cachefiles_daemon_open(struct inode *inode, struct file *file) INIT_LIST_HEAD(&cache->volumes); INIT_LIST_HEAD(&cache->object_list); spin_lock_init(&cache->object_list_lock); + idr_init(&cache->reqs); + spin_lock_init(&cache->reqs_lock); /* set default caching limits * - limit at 1% free space and/or free files @@ -152,6 +154,7 @@ static int cachefiles_daemon_release(struct inode *inode, struct file *file) cachefiles_daemon_unbind(cache); /* clean up the control file interface */ + idr_destroy(&cache->reqs); cache->cachefilesd = NULL; file->private_data = NULL; cachefiles_open = 0; diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index a8e6500889d7..af8ac8107f77 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -15,6 +15,7 @@ #include #include #include +#include #define CACHEFILES_DIO_BLOCK_SIZE 4096 @@ -102,6 +103,9 @@ struct cachefiles_cache { char *rootdirname; /* name of cache root directory */ char *secctx; /* LSM security context */ char *tag; /* cache binding tag */ + + struct idr reqs; + spinlock_t reqs_lock; }; #include