From patchwork Mon Nov 29 14:33:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 518137 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 466B8C433EF for ; Mon, 29 Nov 2021 14:36:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353502AbhK2OjP (ORCPT ); Mon, 29 Nov 2021 09:39:15 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:39666 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377936AbhK2OhK (ORCPT ); Mon, 29 Nov 2021 09:37:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638196432; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BIl6S6tLnztbwnZQ+D2ARsxxfs4zSEMjqZeJuEcCUYE=; b=QtgcR+9W4Xmqsy0hqAwxzTgTkiMBqzSxrO2fybbKFCphbfFi30PNoeWEx8koDVimUzXAdP S8svUO6DMB6j3sPTmNKMJz+LspkaK+DgNtAOqYSVh7Mv1hIdMelR+rCHipO8RDy6nHuBci XuAa1Xu3q0H9uLVFSWVp4V96aXa3BFA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-453-ZN8XkOn9OLmvKlAlXSDyhA-1; Mon, 29 Nov 2021 09:33:48 -0500 X-MC-Unique: ZN8XkOn9OLmvKlAlXSDyhA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8F8D7835E2F; Mon, 29 Nov 2021 14:33:46 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 868716060F; Mon, 29 Nov 2021 14:33:43 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 46/64] cachefiles: Mark a backing file in use with an inode flag From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 29 Nov 2021 14:33:42 +0000 Message-ID: <163819642273.215744.6414248677118690672.stgit@warthog.procyon.org.uk> In-Reply-To: <163819575444.215744.318477214576928110.stgit@warthog.procyon.org.uk> References: <163819575444.215744.318477214576928110.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Use an inode flag, S_KERNEL_FILE, to mark that a backing file is in use by the kernel to prevent cachefiles or other kernel services from interfering with that file. Using S_SWAPFILE instead isn't really viable as that has other effects in the I/O paths. Signed-off-by: David Howells --- fs/cachefiles/internal.h | 2 ++ fs/cachefiles/namei.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index fbb38d3e6cac..ebb39373716b 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -187,6 +187,8 @@ extern struct kmem_cache *cachefiles_object_jar; /* * namei.c */ +extern void cachefiles_unmark_inode_in_use(struct cachefiles_object *object, + struct file *file); extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, struct dentry *dir, const char *name); diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 25ca41952dab..2e209e403713 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -32,6 +32,18 @@ static bool __cachefiles_mark_inode_in_use(struct cachefiles_object *object, return can_use; } +static bool cachefiles_mark_inode_in_use(struct cachefiles_object *object, + struct dentry *dentry) +{ + struct inode *inode = d_backing_inode(dentry); + bool can_use; + + inode_lock(inode); + can_use = __cachefiles_mark_inode_in_use(object, dentry); + inode_unlock(inode); + return can_use; +} + /* * Unmark a backing inode. The caller must hold the inode lock. */ @@ -44,6 +56,29 @@ static void __cachefiles_unmark_inode_in_use(struct cachefiles_object *object, trace_cachefiles_mark_inactive(object, inode); } +/* + * Unmark a backing inode and tell cachefilesd that there's something that can + * be culled. + */ +void cachefiles_unmark_inode_in_use(struct cachefiles_object *object, + struct file *file) +{ + struct cachefiles_cache *cache = object->volume->cache; + struct inode *inode = file_inode(file); + + if (inode) { + inode_lock(inode); + __cachefiles_unmark_inode_in_use(object, file->f_path.dentry); + inode_unlock(inode); + + if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) { + atomic_long_add(inode->i_blocks, &cache->b_released); + if (atomic_inc_return(&cache->f_released)) + cachefiles_state_changed(cache); + } + } +} + /* * get a subdirectory */