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The following reply was made to PR kern/48808; it has been noted by GNATS.
From: "Thomas Schmitt" <scdbackup%gmx.net@localhost>
Subject: Re: kern/48808
Date: Wed, 14 May 2014 11:26:40 +0200
> Forward binary compat like this is not needed - a new mount_cd9660 binary
> can expect a new kernel always.
mount_cd9660(8) is not the exclusive caller of mount(2) with
struct iso_args. So i felt obliged to provide a detection method
in mount_cd9660.h (struct old_iso_args_v_1_6).
I'm a userlander and not far from calling mount(2) in own software.
It would be decisive for me to know whether my args.ssector was
taken into respect.
Next i (in my new role as kernel hacker) had to test whether this
distinction works. This was most easy to do in mount_cd9660(8).
We can tear down all ifdef ISOFSMNT_SSECTOR in mount_cd9660(8)
if they are deemed too ugly.
But they are of educational use for anybody who wants to learn
about this revolution after 20 years of stability.
* The old struct is exposed here to serve as size benchmark for the reply
- * of mount(2) with ISOFSMNT_SSECTOR. If after successful mount(2), the
+ * of mount(2) with MNT_GETARGS. If after successful mount(2), the inquiry
* by MNT_GETARGS yields sizeof(struct old_iso_args_v_1_6) then the
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