From mboxrd@z Thu Jan 1 00:00:00 1970 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=-18.8 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,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 93EDCC433DB for ; Thu, 25 Mar 2021 07:15:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6417561A12 for ; Thu, 25 Mar 2021 07:15:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229614AbhCYHPE (ORCPT ); Thu, 25 Mar 2021 03:15:04 -0400 Received: from mx2.suse.de ([195.135.220.15]:36366 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229616AbhCYHPB (ORCPT ); Thu, 25 Mar 2021 03:15:01 -0400 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=1616656500; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9E8K3Y12Jq2/glSKlknqUA+iAYegTQaOKXCivKmjWUY=; b=IdFS4C8Ybfuat5BCHTadPd8/Kpr8VVK3yubstpsUCimdlfgsl72e/WfPxBFmkihBN4U38G eCFDb3486sJN+CyrKzZFRNy/asjPAwlEOUfGEHm+4wAQXSKtk1E2TtIP9KK8CJBS7Oczcs YMPahGMH9750YYJOgCaT+MXtFYUkqZ8= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 56600AA55 for ; Thu, 25 Mar 2021 07:15:00 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v3 01/13] btrfs: add sysfs interface for supported sectorsize Date: Thu, 25 Mar 2021 15:14:33 +0800 Message-Id: <20210325071445.90896-2-wqu@suse.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210325071445.90896-1-wqu@suse.com> References: <20210325071445.90896-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Add extra sysfs interface features/supported_ro_sectorsize and features/supported_rw_sectorsize to indicate subpage support. Currently for supported_rw_sectorsize all architectures only have their PAGE_SIZE listed. While for supported_ro_sectorsize, for systems with 64K page size, 4K sectorsize is also supported. This new sysfs interface would help mkfs.btrfs to do more accurate warning. Signed-off-by: Qu Wenruo --- fs/btrfs/sysfs.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 6eb1c50fa98c..2f9c2639707c 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -360,11 +360,26 @@ static ssize_t supported_rescue_options_show(struct kobject *kobj, BTRFS_ATTR(static_feature, supported_rescue_options, supported_rescue_options_show); +static ssize_t supported_sectorsizes_show(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + ssize_t ret = 0; + + /* Only support sectorsize == PAGE_SIZE yet */ + ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%lu\n", + PAGE_SIZE); + return ret; +} +BTRFS_ATTR(static_feature, supported_sectorsizes, + supported_sectorsizes_show); + static struct attribute *btrfs_supported_static_feature_attrs[] = { BTRFS_ATTR_PTR(static_feature, rmdir_subvol), BTRFS_ATTR_PTR(static_feature, supported_checksums), BTRFS_ATTR_PTR(static_feature, send_stream_version), BTRFS_ATTR_PTR(static_feature, supported_rescue_options), + BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), NULL }; -- 2.30.1