can someone help me.
how to add mount option to CoreOS ROOT-C USR-A USR-B partition.
I use vm to run coreos.
I want to change mount option enable nobarrier.
ck001 oem # cgpt show /dev/vda
start size part contents
0 1 Hybrid MBR
1 1 Pri GPT header
2 32 Pri GPT table
4096 262144 1 Label: "EFI-SYSTEM"
Type: EFI System Partition
UUID: 7E059C7D-9A14-47D6-83D2-7E352EF7ACC7
Attr: Legacy BIOS Bootable
266240 4096 2 Label: "BIOS-BOOT"
Type: BIOS Boot Partition
UUID: 38542A9E-63A2-401F-836E-F513C9ED0D3D
270336 2097152 3 Label: "USR-A"
Type: Alias for coreos-rootfs
UUID: 7130C94A-213A-4E5A-8E26-6CCE9662F132
Attr: priority=2 tries=1 successful=0
2367488 2097152 4 Label: "USR-B"
Type: Alias for coreos-rootfs
UUID: E03DD35C-7C2D-4A47-B3FE-27F15780A57C
Attr: priority=1 tries=0 successful=1
4464640 262144 6 Label: "OEM"
Type: Alias for linux-data
UUID: E2B34135-76E4-45AD-B161-53CBF8F0949D
4726784 131072 7 Label: "OEM-CONFIG"
Type: CoreOS reserved
UUID: DE013EF1-B534-4C3D-BBDB-661E9D7EB702
4857856 204857311 9 Label: "ROOT"
Type: CoreOS auto-resize
UUID: B3CB0D77-C961-440A-9B54-F2AA16E0FDE8
209715167 32 Sec GPT table
209715199 1 Sec GPT header
/dev/vda4 /usr ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr,acl 0 0