Miklos Szeredi wrote:
Some mount options are never passed to the kernel, and thus can't appear
in /proc/mounts. Examples include user, users, and _netdev for NFS.
These options control *who* may mount and *when* to mount. They are
not a property of the mount itself and are not added to /etc/mtab.
There's a "user=ID" option that is added to /etc/mtab in case of user
mounts. This identifies the owner of the mount, so that it can be
unmounted by that user. There are patches in -mm that enable the
kernel to store this info.
Do you have other examples in mind?
[no]quota comes to mind; also auto, [no]owner, [no]group, and
quiet/loud, but these may fall into the same category you mention above.
Aside: It's a confusing artifact of the mount CLI that these options
control who/when but are passed to the mount command in the same way the
other options are.
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