From: George Mitchell <george@chinilu.com>
To: Karel Zak <kzak@redhat.com>
Cc: util-linux@vger.kernel.org
Subject: Re: umount and findmnt commands not working with btrfs labels ...
Date: Tue, 07 May 2013 07:48:40 -0700 [thread overview]
Message-ID: <51891448.5010804@chinilu.com> (raw)
In-Reply-To: <20130507094835.GB7086@x2.net.home>
On 05/07/2013 02:48 AM, Karel Zak wrote:
> Hi George,
>
> On Mon, May 06, 2013 at 03:28:53PM -0700, George Mitchell wrote:
>> [root@localhost ghmitch]# umount LABEL=MAGEIA3BTR-BOOT
>>
>> umount: LABEL=MAGEIA3BTR-BOOT: not found
> umount --version ?
>
> It works for me (tested with util-linux 2.22 and 2.23):
>
> # mkfs.btrfs -L MAGEIA3BTR /dev/sdb1
> # mkfs.btrfs -L MAGEIA3BTR-FOO /dev/sdb2
>
> # mount LABEL=MAGEIA3BTR /mnt/test
> # mount LABEL=MAGEIA3BTR-FOO /mnt/test
>
> # findmnt LABEL=MAGEIA3BTR
> TARGET SOURCE FSTYPE OPTIONS
> /mnt/test /dev/sdb1 btrfs rw,relatime,ssd,space_cache
>
> # findmnt LABEL=MAGEIA3BTR-FOO
> TARGET SOURCE FSTYPE OPTIONS
> /mnt/test2 /dev/sdb2 btrfs rw,relatime,ssd,space_cache
>
> # umount LABEL=MAGEIA3BTR
> # umount LABEL=MAGEIA3BTR-FOO
>
> # lsblk --fs /dev/sdb
> NAME FSTYPE LABEL UUID MOUNTPOINT
> sdb
> ├─sdb1 btrfs MAGEIA3BTR 6dcc3293-ce27-474f-ab31-dd7a8e5bb2da
> └─sdb2 btrfs MAGEIA3BTR-FOO f3bb2d57-8b46-40a0-ae76-50d78268d6d9
>
>
> It would be nice to have a simple reproducible scenario rather than a
> lot of mount -l outputs and some egrep tricks :-)
>
> You can also try
>
> LIBMOUNT_DEBUG=0xffff umount LABEL=MAGEIA3BTR-BOOT
>
> to see more details.
>
> Karel
>
At this point findmnt works on MAGEIA3BTR-BOOT on which I previously
executed the umount with the debug prefix. findmnt still does NOT work
with MAGEIA3BTR (the root partition) or MAGEIA3BTR-USR (the usr
partition). Since I am not able to unmount either of these on a running
system with the debug statement, I have no way of knowing whether that
would fix the problem. Is there a different debug statement I can use
with findmnt? What I also don't know at this point is whether this is
going to be a permanent fix or whether I will need to redo this with
each reboot? Also you did your testing with a simple one partition
btrfs volume. My system involves up to five partitions in a single RAID
1 volume. My boot volume is spread over two partitions. I am wondering
if that could have something to do with it? In any case, here is what I
come up with using the same debug prefix with findmnt.
Using findmnt on MAGEIA3BTR-BOOT produces the following. It appears to
find the mount point and then print the result:
[root@localhost ghmitch]# LIBMOUNT_DEBUG=0xffff findmnt
LABEL=MAGEIA3BTR-BOOT
libmount: debug mask set to 0xffff.
4859: libmount: TAB: [0x97a6878]: alloc
4859: libmount: TAB: [0x97a6878]: /proc/self/mountinfo: start
parsing [entries=0, filter=not]
4859: libmount: TAB: trying to guess table type
4859: libmount: TAB: [0x97a6878]: add entry: proc /proc
4859: libmount: TAB: TID for /proc/self/mountinfo is 4859
4859: libmount: TAB: [0x97a6878]: add entry: sysfs /sys
4859: libmount: TAB: [0x97a6878]: add entry: devtmpfs /dev
4859: libmount: TAB: [0x97a6878]: add entry: devpts /dev/pts
4859: libmount: TAB: [0x97a6878]: add entry: tmpfs /dev/shm
4859: libmount: TAB: [0x97a6878]: add entry: tmpfs /run
4859: libmount: TAB: [0x97a6878]: add entry: /dev/sde1 /
4859: libmount: TAB: [0x97a6878]: add entry: /dev/sdc2 /usr
4859: libmount: TAB: [0x97a6878]: add entry: securityfs
/sys/kernel/security
4859: libmount: TAB: [0x97a6878]: add entry: tmpfs /sys/fs/cgroup
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/systemd
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/cpuset
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/cpu,cpuacct
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/devices
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/freezer
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/net_cls
4859: libmount: TAB: [0x97a6878]: add entry: cgroup
/sys/fs/cgroup/blkio
4859: libmount: TAB: [0x97a6878]: add entry: systemd-1
/proc/sys/fs/binfmt_misc
4859: libmount: TAB: [0x97a6878]: add entry: mqueue /dev/mqueue
4859: libmount: TAB: [0x97a6878]: add entry: hugetlbfs /dev/hugepages
4859: libmount: TAB: [0x97a6878]: add entry: debugfs /sys/kernel/debug
4859: libmount: TAB: [0x97a6878]: add entry: fusectl
/sys/fs/fuse/connections
4859: libmount: TAB: [0x97a6878]: add entry: none /tmp
4859: libmount: TAB: [0x97a6878]: add entry: /dev/sde3 /home
4859: libmount: TAB: [0x97a6878]: add entry: /dev/sde4 /common
4859: libmount: TAB: [0x97a6878]: add entry: /dev/sdb5 /boot
4859: libmount: TAB: [0x97a6878]: /proc/self/mountinfo: stop
parsing (26 entries)
4859: libmount: CACHE: [0x97a68a0]: alloc
4859: libmount: TAB: [0x97a6878]: lookup next fs
4859: libmount: CACHE: [0x97a68a0]: add entry [ 1] (tag): /dev/sdb5:
LABEL
4859: libmount: CACHE: [0x97a68a0]: add entry [ 2] (path): /dev/sde1:
/dev/sde1
4859: libmount: CACHE: [0x97a68a0]: add entry [ 3] (path): /dev/sdc2:
/dev/sdc2
4859: libmount: CACHE: [0x97a68a0]: add entry [ 4] (path): /dev/sde3:
/dev/sde3
4859: libmount: CACHE: [0x97a68a0]: add entry [ 5] (path): /dev/sde4:
/dev/sde4
4859: libmount: TAB: [0x97a6878]: lookup next fs
TARGET SOURCE FSTYPE OPTIONS
/boot /dev/sdb5 btrfs rw,relatime,space_cache
4859: libmount: TAB: [0x97a6878]: reset
4859: libmount: TAB: [0x97a6878]: free
4859: libmount: CACHE: [0x97a68a0]: free
However, when I do the same operation with MAGEIA3BTR, it DOES seem to
find the mount point (4814: libmount: CACHE: [0x861c8a0]: add entry [
1] (tag): /dev/sdd1: LABEL). The problem is, that is NOT the mount
point. The mount point is /dev/sde1.
[root@localhost ghmitch]# LIBMOUNT_DEBUG=0xffff findmnt LABEL=MAGEIA3BTR
libmount: debug mask set to 0xffff.
4814: libmount: TAB: [0x861c878]: alloc
4814: libmount: TAB: [0x861c878]: /proc/self/mountinfo: start
parsing [entries=0, filter=not]
4814: libmount: TAB: trying to guess table type
4814: libmount: TAB: [0x861c878]: add entry: proc /proc
4814: libmount: TAB: TID for /proc/self/mountinfo is 4814
4814: libmount: TAB: [0x861c878]: add entry: sysfs /sys
4814: libmount: TAB: [0x861c878]: add entry: devtmpfs /dev
4814: libmount: TAB: [0x861c878]: add entry: devpts /dev/pts
4814: libmount: TAB: [0x861c878]: add entry: tmpfs /dev/shm
4814: libmount: TAB: [0x861c878]: add entry: tmpfs /run
4814: libmount: TAB: [0x861c878]: add entry: /dev/sde1 /
4814: libmount: TAB: [0x861c878]: add entry: /dev/sdc2 /usr
4814: libmount: TAB: [0x861c878]: add entry: securityfs
/sys/kernel/security
4814: libmount: TAB: [0x861c878]: add entry: tmpfs /sys/fs/cgroup
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/systemd
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/cpuset
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/cpu,cpuacct
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/devices
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/freezer
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/net_cls
4814: libmount: TAB: [0x861c878]: add entry: cgroup
/sys/fs/cgroup/blkio
4814: libmount: TAB: [0x861c878]: add entry: systemd-1
/proc/sys/fs/binfmt_misc
4814: libmount: TAB: [0x861c878]: add entry: mqueue /dev/mqueue
4814: libmount: TAB: [0x861c878]: add entry: hugetlbfs /dev/hugepages
4814: libmount: TAB: [0x861c878]: add entry: debugfs /sys/kernel/debug
4814: libmount: TAB: [0x861c878]: add entry: fusectl
/sys/fs/fuse/connections
4814: libmount: TAB: [0x861c878]: add entry: none /tmp
4814: libmount: TAB: [0x861c878]: add entry: /dev/sde3 /home
4814: libmount: TAB: [0x861c878]: add entry: /dev/sde4 /common
4814: libmount: TAB: [0x861c878]: add entry: /dev/sdb5 /boot
4814: libmount: TAB: [0x861c878]: /proc/self/mountinfo: stop
parsing (26 entries)
4814: libmount: CACHE: [0x861c8a0]: alloc
4814: libmount: TAB: [0x861c878]: lookup next fs
4814: libmount: CACHE: [0x861c8a0]: add entry [ 1] (tag): /dev/sdd1:
LABEL
4814: libmount: CACHE: [0x861c8a0]: add entry [ 2] (path): /dev/sde1:
/dev/sde1
4814: libmount: CACHE: [0x861c8a0]: add entry [ 3] (path): /dev/sdc2:
/dev/sdc2
4814: libmount: CACHE: [0x861c8a0]: add entry [ 4] (path): /dev/sde3:
/dev/sde3
4814: libmount: CACHE: [0x861c8a0]: add entry [ 5] (path): /dev/sde4:
/dev/sde4
4814: libmount: CACHE: [0x861c8a0]: add entry [ 6] (path): /dev/sdb5:
/dev/sdb5
4814: libmount: TAB: [0x861c878]: reset
4814: libmount: TAB: [0x861c878]: free
4814: libmount: CACHE: [0x861c8a0]: free
Here is my blkid which will give you an overview of the partitions
involved. NOTE that with btrfs there are often multiple partitions with
the same LABEL and UUID, but only ONE of those will be the mount point
and that mount point can change at any time to one of the OTHER
partitions sharing the same label. If umount OR findmnt happen to get
the wrong mountpoint even with the right label, things are not going to
work out:
/dev/sda5: LABEL="MAGEIA3BTR-BOOT"
UUID="63f13151-dd34-45e1-b40d-7ed7d0d0ec4a"
UUID_SUB="978f5c02-5e11-4df4-8f72-4ff6d09e58ff" TYPE="btrfs"
/dev/sda6: LABEL="MAGEIA3X64-BOOT"
UUID="9b4a4323-2e8a-46bb-8773-a37a6d9e663d" TYPE="ext4"
/dev/sda7: UUID="aac18bf5-9d32-4b4d-99ae-31bd19b23f10" TYPE="ext4"
/dev/sdb5: LABEL="MAGEIA3BTR-BOOT"
UUID="63f13151-dd34-45e1-b40d-7ed7d0d0ec4a"
UUID_SUB="0587a676-8bad-4d61-a8af-0e262d997ba7" TYPE="btrfs"
/dev/sdb6: UUID="8b3905fa-9431-4ca2-b88d-2f3382790e10" TYPE="ext4"
/dev/sdc1: LABEL="MAGEIA3BTR"
UUID="2ead7897-2203-4846-9fef-22aac314634d"
UUID_SUB="9f1a5494-eb9b-48d1-8169-2e10682f0ed7" TYPE="btrfs"
/dev/sdc2: LABEL="MAGEIA3BTR-USR"
UUID="d2bd46ff-c25d-4302-b708-76e81dc09977"
UUID_SUB="fb11bf5c-5fcc-4f43-a8b5-502f7f3b80b2" TYPE="btrfs"
/dev/sdc3: LABEL="HOME" UUID="f5bb2e04-2a27-4d8c-9b59-a637f3a51e9a"
UUID_SUB="d730117f-5293-4d73-b1e1-213550bb58aa" TYPE="btrfs"
/dev/sdc4: LABEL="COMMON" UUID="4b0983d7-8d85-463d-85c1-c20aa3b4fa3b"
UUID_SUB="2fed487e-c68a-4688-8ab7-526751d50e62" TYPE="btrfs"
/dev/sdd1: LABEL="MAGEIA3BTR"
UUID="2ead7897-2203-4846-9fef-22aac314634d"
UUID_SUB="831dcba5-ace6-44a4-8a23-94ac38f397f6" TYPE="btrfs"
/dev/sdd2: LABEL="MAGEIA3BTR-USR"
UUID="d2bd46ff-c25d-4302-b708-76e81dc09977"
UUID_SUB="69befc01-5166-466a-b16f-e360a1acd591" TYPE="btrfs"
/dev/sdd3: LABEL="HOME" UUID="f5bb2e04-2a27-4d8c-9b59-a637f3a51e9a"
UUID_SUB="54ff9459-5487-42f8-a8f8-4d6eaa0cd6ef" TYPE="btrfs"
/dev/sdd4: LABEL="COMMON" UUID="4b0983d7-8d85-463d-85c1-c20aa3b4fa3b"
UUID_SUB="91b80d1e-1a9c-4a1a-9f5f-e396ea205085" TYPE="btrfs"
/dev/sde1: LABEL="MAGEIA3BTR"
UUID="2ead7897-2203-4846-9fef-22aac314634d"
UUID_SUB="1c815643-ceb5-4cc8-be6b-35e3d4262dd1" TYPE="btrfs"
/dev/sde2: LABEL="MAGEIA3X64"
UUID="6c63a6ad-def8-47d5-95cb-6fba898b1578" TYPE="ext4"
/dev/sde3: LABEL="HOME" UUID="f5bb2e04-2a27-4d8c-9b59-a637f3a51e9a"
UUID_SUB="8e3a2572-7ab7-4aac-9c01-497a06541786" TYPE="btrfs"
/dev/sde4: LABEL="COMMON" UUID="4b0983d7-8d85-463d-85c1-c20aa3b4fa3b"
UUID_SUB="8e4a1292-980a-4815-9d1f-c43c312bfeb8" TYPE="btrfs"
/dev/sdf2: LABEL="MAGEIA3BTR-USR"
UUID="d2bd46ff-c25d-4302-b708-76e81dc09977"
UUID_SUB="3cc25d5d-534a-4ae5-a5f8-20648cb8c33c" TYPE="btrfs"
/dev/sdf3: LABEL="HOME" UUID="f5bb2e04-2a27-4d8c-9b59-a637f3a51e9a"
UUID_SUB="9bea9ca7-73e9-4290-bc8b-b94771c3e362" TYPE="btrfs"
/dev/sdf4: LABEL="COMMON" UUID="4b0983d7-8d85-463d-85c1-c20aa3b4fa3b"
UUID_SUB="1e459a35-ed8d-4021-b6ea-161bda96305a" TYPE="btrfs"
/dev/sdg2: LABEL="MAGEIA3BTR-USR"
UUID="d2bd46ff-c25d-4302-b708-76e81dc09977"
UUID_SUB="6bc4b144-c90c-4df5-9008-6a98934b55e4" TYPE="btrfs"
/dev/sdg3: LABEL="HOME" UUID="f5bb2e04-2a27-4d8c-9b59-a637f3a51e9a"
UUID_SUB="206f43d8-f51a-4080-b674-26de2dea5ce5" TYPE="btrfs"
/dev/sdg4: LABEL="COMMON" UUID="4b0983d7-8d85-463d-85c1-c20aa3b4fa3b"
UUID_SUB="92bfb4cb-9f4b-4277-ad5e-fe6cf34d368f" TYPE="btrfs"
/dev/sdh1: LABEL="HOME_MIRROR"
UUID="725f431e-0d70-49d5-b0d6-ca2805385dc9" TYPE="jfs"
PARTUUID="850816a4-2cb1-40f2-ac8b-23fedda3f40f"
/dev/sdi: LABEL="BACKUP" UUID="534d18b0-fc56-42e6-bfeb-c63b0f0bdc07"
UUID_SUB="8467e093-5f14-4124-98e5-fb80303ec851" TYPE="btrfs"
next prev parent reply other threads:[~2013-05-07 14:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-06 22:28 umount and findmnt commands not working with btrfs labels George Mitchell
2013-05-07 9:48 ` Karel Zak
2013-05-07 14:10 ` George Mitchell
2013-05-07 14:48 ` George Mitchell [this message]
2013-05-09 9:42 ` Karel Zak
2013-05-09 14:06 ` George Mitchell
2013-05-09 18:53 ` Karel Zak
2013-05-09 16:01 ` George Mitchell
2013-05-09 16:59 ` Helmut Hullen
2013-05-09 19:07 ` Karel Zak
2013-05-09 19:54 ` Roger Leigh
2013-05-10 0:15 ` George Mitchell
2013-05-10 8:28 ` Karel Zak
2013-05-07 15:10 ` George Mitchell
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