[LU-8151] OST/MDT /proc/mounts always shows "ro" for server mountpoints

Gantt End to Start — Thu, 14 Dec 2023 13:56:05 +0000

The /proc/mounts output for all MDT and OST devices shows "ro" (read-only) all the time, even when the devices are working properly. This caused confusion when trying to debug an OST that had actually gone read-only. This is because the "shadow" mountpoints on the server have MS_RDONLY set to prevent users/admins trying to write into these devices, which are only for "statfs" (df) and possibly ioctl() calls (~~LU-137~~).

It would be better to define our own .show_options method in obdclass/obd_mount_server.c::super_operations. It can do an internal dt_statfs() to get the current filesystem state and print "rw" or "ro" as appropriate. It would also be good to print out the rest of the mount options that were used.

Whamcloud Community JIRA

[LU-8151] OST/MDT /proc/mounts always shows "ro" for server mountpoints