Hi, using btrfs with LVM snapshots seems to be confusing /proc/mounts After mounting a snapshot of an original filesystem, the devicename of the original filesystem is overwritten with that of the snapshot in /proc/mounts. Steps to reproduce: arnd@kallisto:/mnt$ sudo mount /dev/vg0/original /mnt/original [ 107.041432] device fsid 5c3e8ca2-da56-4ade-9fef-103a6a8a70c2 devid 1 transid 4 /dev/mapper/vg0-original [ 107.044691] btrfs: no dev_stats entry found for device /dev/mapper/vg0-original (devid 1) (OK on first mount after mkfs) arnd@kallisto:/mnt$ cat /proc/mounts | grep /mnt /dev/mapper/vg0-original /mnt/original btrfs rw,relatime,ssd,space_cache 0 0 arnd@kallisto:/mnt$ sudo lvcreate -L 10M --snap --name snapshot /dev/vg0/original arnd@kallisto:/mnt$ sudo mount /dev/vg0/testsnap /mnt/testsnap [ 215.432281] device fsid 5c3e8ca2-da56-4ade-9fef-103a6a8a70c2 devid 1 transid 4 /dev/mapper/vg0-testsnap arnd@kallisto:/mnt$ cat /proc/mounts | grep /mnt /dev/mapper/vg0-testsnap /mnt/original btrfs rw,relatime,ssd,space_cache 0 0 /dev/mapper/vg0-testsnap /mnt/testsnap btrfs rw,relatime,ssd,space_cache 0 0 arnd@kallisto:/mnt$ sudo umount /dev/vg0/testsnap arnd@kallisto:/mnt$ cat /proc/mounts | grep /mnt /dev/mapper/vg0-testsnap /mnt/original btrfs rw,relatime,ssd,space_cache 0 0 Best regards, Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
