From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp1040.oracle.com ([141.146.126.69]:41501 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753776AbbJUIrg (ORCPT ); Wed, 21 Oct 2015 04:47:36 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t9L8laFw013507 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 21 Oct 2015 08:47:36 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserv0022.oracle.com (8.13.8/8.13.8) with ESMTP id t9L8lZa1005060 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Wed, 21 Oct 2015 08:47:36 GMT Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by userv0122.oracle.com (8.13.8/8.13.8) with ESMTP id t9L8lZGo018317 for ; Wed, 21 Oct 2015 08:47:35 GMT From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [RFC PATCH 2/3] btrfs-progs: kernel based default features for mkfs Date: Wed, 21 Oct 2015 16:45:48 +0800 Message-Id: <1445417149-804-2-git-send-email-anand.jain@oracle.com> In-Reply-To: <1445417149-804-1-git-send-email-anand.jain@oracle.com> References: <1445417149-804-1-git-send-email-anand.jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: mkfs from latest btrfs-progs will enable latest default features, and if the kernel is down-rev and does not support a latest default feature then mount fails, as expected. This patch disables default features based on the running kernel. Signed-off-by: Anand Jain --- mkfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mkfs.c b/mkfs.c index a5802f7..2b9d734 100644 --- a/mkfs.c +++ b/mkfs.c @@ -1357,10 +1357,13 @@ int main(int ac, char **av) int dev_cnt = 0; int saved_optind; char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = { 0 }; - u64 features = BTRFS_MKFS_DEFAULT_FEATURES; + u64 features; struct mkfs_allocation allocation = { 0 }; struct btrfs_mkfs_config mkfs_cfg; + features = btrfs_features_allowed_by_kernel(); + features &= BTRFS_MKFS_DEFAULT_FEATURES; + while(1) { int c; static const struct option long_options[] = { -- 2.4.1