From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:32718 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752714AbbIOIsI (ORCPT ); Tue, 15 Sep 2015 04:48:08 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t8F8m8Ge009869 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Tue, 15 Sep 2015 08:48:08 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id t8F8m8KX030495 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Tue, 15 Sep 2015 08:48:08 GMT Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by userv0121.oracle.com (8.13.8/8.13.8) with ESMTP id t8F8m7Lw024001 for ; Tue, 15 Sep 2015 08:48:08 GMT From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [PATCH 2/2] btrfs-progs: optimize not to scan repeated fsid mount points Date: Tue, 15 Sep 2015 16:46:23 +0800 Message-Id: <1442306783-1288-2-git-send-email-anand.jain@oracle.com> In-Reply-To: <1442306783-1288-1-git-send-email-anand.jain@oracle.com> References: <1442306783-1288-1-git-send-email-anand.jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: fsid can be mounted multiple times, with different subvolid. And we don't have to scan a mount point if we already have that in the scanned list. And thus nicely avoids the following warning with multiple subvol mounts on older kernel like 2.6.32 where BTRFS_IOC_GET_FSLABEL ioctl does not exist. ./btrfs fi show -m Label: none uuid: 31845933-611e-422d-ae6f-386e57ad81aa Total devices 2 FS bytes used 172.00KiB devid 1 size 3.00GiB used 642.38MiB path /dev/sdd devid 2 size 3.00GiB used 622.38MiB path /dev/sde warning, device 2 is missing warning devid 2 not found already warning, device 2 is missing warning devid 2 not found already Signed-off-by: Anand Jain --- cmds-filesystem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/cmds-filesystem.c b/cmds-filesystem.c index 793df0e..e2049cc 100644 --- a/cmds-filesystem.c +++ b/cmds-filesystem.c @@ -468,6 +468,10 @@ static int btrfs_scan_kernel(void *search, unsigned unit_mode) goto out; } + /* skip all fs already shown as mounted fs */ + if (is_seen_fsid(fs_info_arg.fsid)) + continue; + ret = get_label_mounted(mnt->mnt_dir, label); /* provide backward kernel compatibility */ if (ret == -ENOTTY) -- 2.4.1