From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([59.151.112.132]:23855 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752624AbbEEGSx (ORCPT ); Tue, 5 May 2015 02:18:53 -0400 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id t456HZRP008357 for ; Tue, 5 May 2015 14:17:35 +0800 From: Qu Wenruo To: Subject: [PATCH 5/8] btrfs-progs: Introduce function change_device_uuid(). Date: Tue, 5 May 2015 14:16:43 +0800 Message-ID: <1430806606-3226-6-git-send-email-quwenruo@cn.fujitsu.com> In-Reply-To: <1430806606-3226-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1430806606-3226-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-btrfs-owner@vger.kernel.org List-ID: This function just change a device item's uuid. Signed-off-by: Qu Wenruo --- btrfstune.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/btrfstune.c b/btrfstune.c index 9c1b7aa..6706cd7 100644 --- a/btrfstune.c +++ b/btrfstune.c @@ -198,6 +198,27 @@ out: return ret; } +static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb, + int slot) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_dev_item *di; + int ret = 0; + + di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item); + if (fs_info->new_fsid) { + if (!memcmp_extent_buffer(eb, fs_info->new_fsid, + (unsigned long)btrfs_device_fsid(di), + BTRFS_FSID_SIZE)) + return ret; + write_extent_buffer(eb, fs_info->new_fsid, + (unsigned long)btrfs_device_fsid(di), + BTRFS_FSID_SIZE); + ret = write_tree_block(NULL, root, eb); + } + return ret; +} + static void print_usage(void) { fprintf(stderr, "usage: btrfstune [options] device\n"); -- 2.3.7