Hello all, I am having problems with some sort of bug in the umount
command that causes it not to process hyphenated labels on btrfs
volumes. Here is the scenario:
[root@localhost ghmitch]# mount -l
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs
(rw,nosuid,size=2065704k,nr_inodes=194082,mode=755)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
/dev/sde1 on / type btrfs (rw,relatime,space_cache) [MAGEIA3BTR]
/dev/sdc2 on /usr type btrfs (rw,relatime,space_cache) [MAGEIA3BTR-USR]
securityfs on /sys/kernel/security type securityfs
(rw,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs
(rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
none on /tmp type tmpfs (rw,relatime)
/dev/sdb5 on /boot type btrfs (rw,relatime,space_cache) [MAGEIA3BTR-BOOT]
/dev/sde3 on /home type btrfs (rw,relatime,space_cache) [HOME]
/dev/sde4 on /common type btrfs (rw,relatime,space_cache) [COMMON]
[root@localhost ghmitch]# umount LABEL=MAGEIA3BTR-BOOT
umount: LABEL=MAGEIA3BTR-BOOT: not found
[root@localhost ghmitch]# umount `mount -l | egrep "\[MAGEIA3BTR-BOOT\]"
| cut -f1 -d" "`
[root@localhost ghmitch]# mount -l
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs
(rw,nosuid,size=2065704k,nr_inodes=194082,mode=755)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
/dev/sde1 on / type btrfs (rw,relatime,space_cache) [MAGEIA3BTR]
/dev/sdc2 on /usr type btrfs (rw,relatime,space_cache) [MAGEIA3BTR-USR]
securityfs on /sys/kernel/security type securityfs
(rw,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs
(rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
none on /tmp type tmpfs (rw,relatime)
/dev/sde3 on /home type btrfs (rw,relatime,space_cache) [HOME]
/dev/sde4 on /common type btrfs (rw,relatime,space_cache) [COMMON]
[root@localhost ghmitch]# mount LABEL=MAGEIA3BTR-BOOT
[root@localhost ghmitch]# mount -l
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs
(rw,nosuid,size=2065704k,nr_inodes=194082,mode=755)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
/dev/sde1 on / type btrfs (rw,relatime,space_cache) [MAGEIA3BTR]
/dev/sdc2 on /usr type btrfs (rw,relatime,space_cache) [MAGEIA3BTR-USR]
securityfs on /sys/kernel/security type securityfs
(rw,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs
(rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
none on /tmp type tmpfs (rw,relatime)
/dev/sde3 on /home type btrfs (rw,relatime,space_cache) [HOME]
/dev/sde4 on /common type btrfs (rw,relatime,space_cache) [COMMON]
/dev/sdb5 on /boot type btrfs (rw,relatime,space_cache) [MAGEIA3BTR-BOOT]
[root@localhost ghmitch]#
As you can see, mount has no problem with hyphenated btrfs labels. And
when I use a workaround script to unmount the filesystem via a label,
that works fine. But the umount LABEL=XXX-00 format fails every time.
This seems almost like a regression of sorts since I remember long ago
having EXACTLY the same problem with umount and ext4 partitions. The
findmnt command also has problems with btrfs labels in general. Every
instance of `findmnt LABEL=XXX` I have tried on btrfs volumes fails.
Example below:
[root@localhost ghmitch]# findmnt LABEL=MAGEIA3BTR [root@localhost
ghmitch]# findmnt `mount -l | egrep "\[MAGEIA3BTR\]" | cut -f1 -d" "`
TARGET SOURCE FSTYPE OPTIONS / /dev/sde1 btrfs rw,relatime,space_cache
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