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block: sed-opal: Add ioctl to return device status

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Provide a mechanism to retrieve basic status information about
the device, including the "supported" flag indicating whether
SED-OPAL is supported. The information returned is from the various
feature descriptors received during the discovery0 step, and so
this ioctl does nothing more than perform the discovery0 step
and then save the information received. See "struct opal_status"
and OPAL_FL_* bits for the status information currently returned.

This is necessary to be able to check whether a device is OPAL
enabled, set up, locked or unlocked from userspace programs
like systemd-cryptsetup and libcryptsetup. Right now we just
have to assume the user 'knows' or blindly attempt setup/lock/unlock
operations.

Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Link: https://lore.kernel.org/r/20220816140713.84893-1-luca.boccassi@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
dougmill@linux.vnet.ibm.com 2022-08-16 15:07:13 +01:00 • committed by Jens Axboe
parent 1c23f9e627
commit c6ea706042
4 changed files with 96 additions and 12 deletions
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1
include/linux/sed-opal.h
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@ -43,6 +43,7 @@ static inline bool is_sed_ioctl(unsigned int cmd)
case IOC_OPAL_MBR_DONE:
case IOC_OPAL_WRITE_SHADOW_MBR:
case IOC_OPAL_GENERIC_TABLE_RW:
case IOC_OPAL_GET_STATUS:
return true;
}
return false;