Hello everybody,
looks like lvm2 2.02.105 breaks snapshots. This is my block device tree:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 477G 0 disk
|-sda1 8:1 0 767M 0 part
| `-vg0-boot 254:0 0 64M 0 lvm /boot
|-sda2 8:2 0 444,2G 0 part
| `-cvg 254:3 0 444,2G 0 crypt
| |-cvg-root 254:4 0 40G 0 lvm /
| |-cvg-swap 254:5 0 4G 0 lvm [SWAP]
| |-cvg-log 254:6 0 1G 0 lvm /var/log
| `-cvg-home 254:8 0 320G 0 lvm /home
|-sda3 8:3 0 32G 0 part
`-sda128 259:0 0 1M 0 part
Creating a snapshot succeeds, but it is broken and can not be mounted:
# lvcreate -s -pr -l50%free -n snap-home cvg/home
Logical volume "snap-home" created
# mount /dev/cvg/snap-home /mnt/tmp
mount: /dev/mapper/cvg-snap--home is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on
/dev/mapper/cvg-snap--home, missing codepage or helper program, or other error
Syslog has a lot of these messages:
[ 4823.002220] EXT4-fs (dm-7): ext4_check_descriptors: Checksum for group 256
failed (43470!=57954)
Downgrading to lvm2 2.02.104 fixes the problem:
# lvcreate -s -pr -l50%free -n snap-home
cvg/home Logical volume "snap-home" created
# mount /dev/cvg/snap-home /mnt/tmp
mount: /dev/mapper/cvg-snap--home is write-protected, mounting read-only
This is an Arch Linux system with Linux 3.12.8.
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