On Thu, Mar 20, 2008 at 11:55:32AM +1000, Da Rock wrote: > I'm just looking into the removable device issue for freebsd. I can see > its easy enough to auto mount a removable device (although I could use > some help getting sd/xd devices working with my card reader), but the > removal seems to come unstuck. > > I have some barely literates on my systems, so I do need to work this > out. Is it possible to use a forced umount to do this? What are the > options here?
In short, no. Removal of a USB device would be forwarded to devd(8). But since the device is no longer there at that moment, you cannot unmount it anymore. You might get a nice kernel panic for your efforts, though. ;-) The FreeBSD disk subsystem was simple not written with removable devices in mind, because they didn't exist back then. Until that code is fixed (which is hard) you _have_ to unmount before you pull the device out. One (not bullet-proof) workaround might be to use the automounter [amd(8)], and have it unmount very quickly after they stop being active. This requires setting both the 'cache_duration' and 'dismount_interval' options in amd.conf(5) to very low values. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
Description: PGP signature