When remounted without option specified, some filesystems keep the options that are already set (e.g. procfs, fat) and some reset them to default (e.g. devpts). Regarding options that are specified at remount, behavior of filesystems also differ: some apply them (procfs, devpts), some silently disregard them (e.g. fat) and some have a more elaborate behavior (e.g. xfs apparently allows a subset of options to be changed and issues warning if someone tries to change any other option). Is there any policy regarding what the correct behavior should be? This variety of behaviors tends to confuse mount utility which often does not show the correct option actually set after a remount and most certainly confuses the users as well. Here is a example of discrepancy between mount (/etc/mtab) and /proc/mounts: $ grep proc /proc/mounts /proc /proc proc rw,relatime 0 0 $ mount | grep proc proc on /proc type proc (rw) $ mount -o remount,hidepid=2 /proc/ $ grep proc /proc/mounts /proc /proc proc rw,relatime,hidepid=2 0 0 $ mount | grep proc proc on /proc type proc (rw,hidepid=2) $ mount -o remount /proc/ $ grep proc /proc/mounts /proc /proc proc rw,relatime,hidepid=2 0 0 $ mount | grep proc proc on /proc type proc (rw) And here is the discrepancy: mount does not show "hidepid=2" option that is actually still set and enforced. Note that mount also missed the relatime option to begin with. Regards, Jerome -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
