TGT and DPO,FUA

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Hi,

I am using tgt as iscsi server, and found linux kernel said that a tgt
scsi target does not support DPO and FUA:

[ 4671.673196] scsi8 : iSCSI Initiator over TCP/IP
[ 4671.928530] scsi 8:0:0:0: RAID              IET      Controller
  0001 PQ: 0 ANSI: 5
[ 4671.928800] scsi 8:0:0:0: Attached scsi generic sg5 type 12
[ 4671.929454] scsi 8:0:0:1: Direct-Access     IET      VIRTUAL-DISK
  0001 PQ: 0 ANSI: 5
[ 4671.930878] sd 8:0:0:1: Attached scsi generic sg6 type 0
[ 4671.932074] sd 8:0:0:1: [sde] 6144000 512-byte logical blocks:
(3.14 GB/2.92 GiB)
[ 4671.932273] sd 8:0:0:1: [sde] Write Protect is off
[ 4671.932277] sd 8:0:0:1: [sde] Mode Sense: 69 00 00 08
[ 4671.932420] sd 8:0:0:1: [sde] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA


Why does not tgt support these two features ? but I have found its
source code handle
DPO and FUA flag in its bs_rdwr.c.

Regards,
Tom
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