From patchwork Tue Dec 1 08:21:25 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: 11942239 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 A53E1C64E7A for ; Tue, 1 Dec 2020 08:22:22 +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 48BB520659 for ; Tue, 1 Dec 2020 08:22:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="q7fVue6+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 48BB520659 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.41669.75101 (Exim 4.92) (envelope-from ) id 1kk0vO-0005of-FO; Tue, 01 Dec 2020 08:22:14 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 41669.75101; Tue, 01 Dec 2020 08:22:14 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kk0vO-0005oT-A2; Tue, 01 Dec 2020 08:22:14 +0000 Received: by outflank-mailman (input) for mailman id 41669; Tue, 01 Dec 2020 08:22:12 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kk0vM-0004Uj-Jt for xen-devel@lists.xenproject.org; Tue, 01 Dec 2020 08:22:12 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id c3e75dc9-6b8c-4948-9e33-bfc041c331ed; 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 E7BA2AC2F; 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: c3e75dc9-6b8c-4948-9e33-bfc041c331ed 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=1606810894; 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=7nEfxMc4Y111J56Pbtn4xCo86ZYNHh7NsCYZakRnxAw=; b=q7fVue6+a3LnDyFS4uwGeOnENuWlrCODSQKGhqEjyhoQOU0imZti8xKGiJxIgP4ZPH0XGq NcJcyyWri44MTb8Bd6uW73F0Exdla3Y1bf3Kz69CES6KlvO/AeUxcAaeshGW8aFjl48Syi NJNsGCjs8OelOTH3cwKbfq2LzCG5/UE= 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 14/17] xen/hypfs: add support for id-based dynamic directories Date: Tue, 1 Dec 2020 09:21:25 +0100 Message-Id: <20201201082128.15239-15-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 some helpers to hypfs.c to support dynamic directories with a numerical id as name. The dynamic directory is based on a template specified by the user allowing to use specific access functions and having a predefined set of entries in the directory. Signed-off-by: Juergen Gross --- V2: - use macro for length of entry name (Jan Beulich) - const attributes (Jan Beulich) - use template name as format string (Jan Beulich) - add hypfs_dynid_entry_size() helper (Jan Beulich) - expect dyndir data having been allocated by enter() callback --- xen/common/hypfs.c | 75 +++++++++++++++++++++++++++++++++++++++++ xen/include/xen/hypfs.h | 17 ++++++++++ 2 files changed, 92 insertions(+) diff --git a/xen/common/hypfs.c b/xen/common/hypfs.c index 39448c5409..1819b26925 100644 --- a/xen/common/hypfs.c +++ b/xen/common/hypfs.c @@ -355,6 +355,81 @@ unsigned int hypfs_getsize(const struct hypfs_entry *entry) return entry->size; } +int hypfs_read_dyndir_id_entry(const struct hypfs_entry_dir *template, + unsigned int id, bool is_last, + XEN_GUEST_HANDLE_PARAM(void) *uaddr) +{ + struct xen_hypfs_dirlistentry direntry; + char name[HYPFS_DYNDIR_ID_NAMELEN]; + unsigned int e_namelen, e_len; + + e_namelen = snprintf(name, sizeof(name), template->e.name, id); + e_len = DIRENTRY_SIZE(e_namelen); + direntry.e.pad = 0; + direntry.e.type = template->e.type; + direntry.e.encoding = template->e.encoding; + direntry.e.content_len = template->e.funcs->getsize(&template->e); + direntry.e.max_write_len = template->e.max_size; + direntry.off_next = is_last ? 0 : e_len; + if ( copy_to_guest(*uaddr, &direntry, 1) ) + return -EFAULT; + if ( copy_to_guest_offset(*uaddr, DIRENTRY_NAME_OFF, name, + e_namelen + 1) ) + return -EFAULT; + + guest_handle_add_offset(*uaddr, e_len); + + return 0; +} + +static struct hypfs_entry *hypfs_dyndir_findentry( + const struct hypfs_entry_dir *dir, const char *name, unsigned int name_len) +{ + const struct hypfs_dyndir_id *data; + + data = hypfs_get_dyndata(); + + /* Use template with original findentry function. */ + return data->template->e.funcs->findentry(data->template, name, name_len); +} + +static int hypfs_read_dyndir(const struct hypfs_entry *entry, + XEN_GUEST_HANDLE_PARAM(void) uaddr) +{ + const struct hypfs_dyndir_id *data; + + data = hypfs_get_dyndata(); + + /* Use template with original read function. */ + return data->template->e.funcs->read(&data->template->e, uaddr); +} + +struct hypfs_entry *hypfs_gen_dyndir_entry_id( + const struct hypfs_entry_dir *template, unsigned int id) +{ + struct hypfs_dyndir_id *data; + + data = hypfs_get_dyndata(); + + data->template = template; + data->id = id; + snprintf(data->name, sizeof(data->name), template->e.name, id); + data->dir = *template; + data->dir.e.name = data->name; + data->dir.e.funcs = &data->funcs; + data->funcs = *template->e.funcs; + data->funcs.findentry = hypfs_dyndir_findentry; + data->funcs.read = hypfs_read_dyndir; + + return &data->dir.e; +} + +unsigned int hypfs_dynid_entry_size(const struct hypfs_entry *template, + unsigned int id) +{ + return DIRENTRY_SIZE(snprintf(NULL, 0, template->name, id)); +} + int hypfs_read_dir(const struct hypfs_entry *entry, XEN_GUEST_HANDLE_PARAM(void) uaddr) { diff --git a/xen/include/xen/hypfs.h b/xen/include/xen/hypfs.h index be8d6c508a..1782c50b30 100644 --- a/xen/include/xen/hypfs.h +++ b/xen/include/xen/hypfs.h @@ -76,6 +76,16 @@ struct hypfs_entry_dir { struct list_head dirlist; }; +struct hypfs_dyndir_id { + struct hypfs_entry_dir dir; /* Modified copy of template. */ + struct hypfs_funcs funcs; /* Dynamic functions. */ + const struct hypfs_entry_dir *template; /* Template used. */ +#define HYPFS_DYNDIR_ID_NAMELEN 12 + char name[HYPFS_DYNDIR_ID_NAMELEN]; /* Name of hypfs entry. */ + + unsigned int id; /* Numerical id. */ +}; + #define HYPFS_VARDIR_INIT(var, nam, fn) \ struct hypfs_entry_dir __read_mostly var = { \ .e.type = XEN_HYPFS_TYPE_DIR, \ @@ -181,6 +191,13 @@ struct hypfs_entry *hypfs_dir_findentry(const struct hypfs_entry_dir *dir, void *hypfs_alloc_dyndata(unsigned long size); void *hypfs_get_dyndata(void); void hypfs_free_dyndata(void); +int hypfs_read_dyndir_id_entry(const struct hypfs_entry_dir *template, + unsigned int id, bool is_last, + XEN_GUEST_HANDLE_PARAM(void) *uaddr); +struct hypfs_entry *hypfs_gen_dyndir_entry_id( + const struct hypfs_entry_dir *template, unsigned int id); +unsigned int hypfs_dynid_entry_size(const struct hypfs_entry *template, + unsigned int id); #endif #endif /* __XEN_HYPFS_H__ */