[Bug 274274] nmount logs to_path twice via ktrace()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274274

Ed Maste <emaste@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |emaste@freebsd.org

--- Comment #2 from Ed Maste <emaste@freebsd.org> ---
Note that ktrace is documented to list namei translations performed by the
process(es), not syscall arguments. In the mount_nullfs case those are the
namei operations that the kernel performed due to the nmount syscall, in the
order that it performed them.

unmount may not log a name translation because it may not perform one:

> If the MNT_BYFSID flag is specified, dir should instead be a file system
> ID encoded as “FSID:val0:val1”, where val0 and val1 are the contents of
> the fsid_t val[] array in decimal.  The file system that has the
> specified file system ID will be unmounted.

It may be that the ktrace(1) man page needs a note to make it clear that namei
operations do not necessarily correspond directly to syscall path arguments.

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