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

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Labels: medium
• Severity: 3
• Assignee: Arshad Hussain
• Reporter: Andreas Dilger

Description

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.

Issue Links

• has to be done after: LU-16280 Make conf-sanity/117 call setup() only when LustreFS is not mounted
• is related to: LU-137 ioctl passthrough mechanism for Lustre OST/MDT mountpoints