[stgt] [PATCH] SMC: do not allow load/unload of media that has been pinned down with PreventAllowMediumRemoval

ronnie sahlberg ronniesahlberg at gmail.com
Sun Feb 5 00:43:41 CET 2012

List, Tomo

Please find attached a small patch for SMC.
It now prevents the media changer commands from loading/unloading
media to a data transfer device IF that data transfer device has the
media removal prevention set via PreventAllowMediumRemoval.

Initiators set this when they mount a device that is removable.

For example if you have a removable SBC device like the sbc jukebox
example, Linux for example will set the PreventAllowMediumRemoval when
mount -o ro,noload <device> <mountpoint>
just so that no one will eject the media while the filesystem is mounted.

Similarly this also happens for MMC devices,   and I belive also on
SSC devices, but I cant check SSC devices.
(Mark, If I assume that backup applocations do use
PreventAllowMediumRemoval when they have loaded a tape into the dt

ronnie sahlberg
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