From patchwork Tue Dec 1 08:21:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 11942233 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16B57C64E7B for ; Tue, 1 Dec 2020 08:22:16 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 859B62087C for ; Tue, 1 Dec 2020 08:22:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="jEbgpZ10" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 859B62087C Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.41652.75061 (Exim 4.92) (envelope-from ) id 1kk0vE-0005Rt-RD; Tue, 01 Dec 2020 08:22:04 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 41652.75061; Tue, 01 Dec 2020 08:22:04 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kk0vE-0005RM-Dq; Tue, 01 Dec 2020 08:22:04 +0000 Received: by outflank-mailman (input) for mailman id 41652; Tue, 01 Dec 2020 08:22:02 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kk0vC-0004Uj-Je for xen-devel@lists.xenproject.org; Tue, 01 Dec 2020 08:22:02 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 140159a2-5e1f-4a70-a062-b217f06cd2c0; Tue, 01 Dec 2020 08:21:35 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id AA3E8AF30; Tue, 1 Dec 2020 08:21:33 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 140159a2-5e1f-4a70-a062-b217f06cd2c0 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1606810893; h=from:from:reply-to: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=FZxV6jsf+IHXWLLNyxfWYa8r8oAvJLZTojatFVH5etE=; b=jEbgpZ10S3Xr01s/3ASowbRpBT+X/cyV0c8W4GNBCHOn59lgdMPBAK10SLlkYdJMk5c4Pt MIsa02484ifRClmscqGm1wvmVdD6BM4+kRB8aZjoRbRbJIa5yZ+Oex3LFRIXMW/GtTjeeT +pSk1w+TBHplJ7DyxCvsLN/Y/vZS650= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Subject: [PATCH v2 13/17] xen/hypfs: support dynamic hypfs nodes Date: Tue, 1 Dec 2020 09:21:24 +0100 Message-Id: <20201201082128.15239-14-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201201082128.15239-1-jgross@suse.com> References: <20201201082128.15239-1-jgross@suse.com> MIME-Version: 1.0 Add a HYPFS_VARDIR_INIT() macro for initializing such a directory statically, taking a struct hypfs_funcs pointer as parameter additional to those of HYPFS_DIR_INIT(). Modify HYPFS_VARSIZE_INIT() to take the function vector pointer as an additional parameter as this will be needed for dynamical entries. For being able to let the generic hypfs coding continue to work on normal struct hypfs_entry entities even for dynamical nodes add some infrastructure for allocating a working area for the current hypfs request in order to store needed information for traversing the tree. This area is anchored in a percpu pointer and can be retrieved by any level of the dynamic entries. The normal way to handle allocation and freeing is to allocate the data in the enter() callback of a node and to free it in the related exit() callback. Add a hypfs_add_dyndir() function for adding a dynamic directory template to the tree, which is needed for having the correct reference to its position in hypfs. Signed-off-by: Juergen Gross --- V2: - switch to xzalloc_bytes() in hypfs_alloc_dyndata() (Jan Beulich) - carved out from previous patch - use enter() and exit() callbacks for allocating and freeing dyndata memory - add hypfs_add_dyndir() --- xen/common/hypfs.c | 31 +++++++++++++++++++++++++++++++ xen/include/xen/hypfs.h | 28 ++++++++++++++++++---------- 2 files changed, 49 insertions(+), 10 deletions(-) diff --git a/xen/common/hypfs.c b/xen/common/hypfs.c index e5adc9defe..39448c5409 100644 --- a/xen/common/hypfs.c +++ b/xen/common/hypfs.c @@ -72,6 +72,7 @@ enum hypfs_lock_state { hypfs_write_locked }; static DEFINE_PER_CPU(enum hypfs_lock_state, hypfs_locked); +static DEFINE_PER_CPU(struct hypfs_dyndata *, hypfs_dyndata); static DEFINE_PER_CPU(const struct hypfs_entry *, hypfs_last_node_entered); @@ -157,6 +158,30 @@ static void node_exit_all(void) node_exit(*last); } +void *hypfs_alloc_dyndata(unsigned long size) +{ + unsigned int cpu = smp_processor_id(); + + ASSERT(per_cpu(hypfs_locked, cpu) != hypfs_unlocked); + ASSERT(per_cpu(hypfs_dyndata, cpu) == NULL); + + per_cpu(hypfs_dyndata, cpu) = xzalloc_bytes(size); + + return per_cpu(hypfs_dyndata, cpu); +} + +void *hypfs_get_dyndata(void) +{ + ASSERT(this_cpu(hypfs_dyndata)); + + return this_cpu(hypfs_dyndata); +} + +void hypfs_free_dyndata(void) +{ + XFREE(this_cpu(hypfs_dyndata)); +} + static int add_entry(struct hypfs_entry_dir *parent, struct hypfs_entry *new) { int ret = -ENOENT; @@ -218,6 +243,12 @@ int hypfs_add_dir(struct hypfs_entry_dir *parent, return ret; } +void hypfs_add_dyndir(struct hypfs_entry_dir *parent, + struct hypfs_entry_dir *template) +{ + template->e.parent = &parent->e; +} + int hypfs_add_leaf(struct hypfs_entry_dir *parent, struct hypfs_entry_leaf *leaf, bool nofault) { diff --git a/xen/include/xen/hypfs.h b/xen/include/xen/hypfs.h index 8d96abd805..be8d6c508a 100644 --- a/xen/include/xen/hypfs.h +++ b/xen/include/xen/hypfs.h @@ -76,7 +76,7 @@ struct hypfs_entry_dir { struct list_head dirlist; }; -#define HYPFS_DIR_INIT(var, nam) \ +#define HYPFS_VARDIR_INIT(var, nam, fn) \ struct hypfs_entry_dir __read_mostly var = { \ .e.type = XEN_HYPFS_TYPE_DIR, \ .e.encoding = XEN_HYPFS_ENC_PLAIN, \ @@ -84,22 +84,25 @@ struct hypfs_entry_dir { .e.size = 0, \ .e.max_size = 0, \ .e.list = LIST_HEAD_INIT(var.e.list), \ - .e.funcs = &hypfs_dir_funcs, \ + .e.funcs = (fn), \ .dirlist = LIST_HEAD_INIT(var.dirlist), \ } -#define HYPFS_VARSIZE_INIT(var, typ, nam, msz) \ - struct hypfs_entry_leaf __read_mostly var = { \ - .e.type = (typ), \ - .e.encoding = XEN_HYPFS_ENC_PLAIN, \ - .e.name = (nam), \ - .e.max_size = (msz), \ - .e.funcs = &hypfs_leaf_ro_funcs, \ +#define HYPFS_DIR_INIT(var, nam) \ + HYPFS_VARDIR_INIT(var, nam, &hypfs_dir_funcs) + +#define HYPFS_VARSIZE_INIT(var, typ, nam, msz, fn) \ + struct hypfs_entry_leaf __read_mostly var = { \ + .e.type = (typ), \ + .e.encoding = XEN_HYPFS_ENC_PLAIN, \ + .e.name = (nam), \ + .e.max_size = (msz), \ + .e.funcs = (fn), \ } /* Content and size need to be set via hypfs_string_set_reference(). */ #define HYPFS_STRING_INIT(var, nam) \ - HYPFS_VARSIZE_INIT(var, XEN_HYPFS_TYPE_STRING, nam, 0) + HYPFS_VARSIZE_INIT(var, XEN_HYPFS_TYPE_STRING, nam, 0, &hypfs_leaf_ro_funcs) /* * Set content and size of a XEN_HYPFS_TYPE_STRING node. The node will point @@ -150,6 +153,8 @@ extern struct hypfs_entry_dir hypfs_root; int hypfs_add_dir(struct hypfs_entry_dir *parent, struct hypfs_entry_dir *dir, bool nofault); +void hypfs_add_dyndir(struct hypfs_entry_dir *parent, + struct hypfs_entry_dir *template); int hypfs_add_leaf(struct hypfs_entry_dir *parent, struct hypfs_entry_leaf *leaf, bool nofault); const struct hypfs_entry *hypfs_node_enter(const struct hypfs_entry *entry); @@ -173,6 +178,9 @@ struct hypfs_entry *hypfs_leaf_findentry(const struct hypfs_entry_dir *dir, struct hypfs_entry *hypfs_dir_findentry(const struct hypfs_entry_dir *dir, const char *name, unsigned int name_len); +void *hypfs_alloc_dyndata(unsigned long size); +void *hypfs_get_dyndata(void); +void hypfs_free_dyndata(void); #endif #endif /* __XEN_HYPFS_H__ */