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iscsi: always query max WRITE SAME length 

Max WRITE SAME length is also used when the UNMAP bit is zero, so it
should be queried even if LBPWS=0.  Same for the optimal transfer
length.

However, the write_zeroes_alignment only matters for UNMAP=1 so we
still restrict it to LBPWS=1.

Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-04-02 15:30:29 +02:00
parent b2f9c08a4f
commit c97ca29db0
1 changed files with 7 additions and 5 deletions
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12
block/iscsi.c
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@ -1335,18 +1335,20 @@ static int iscsi_refresh_limits(BlockDriverState *bs)
/* We don't actually refresh here, but just return data queried in
* iscsi_open(): iscsi targets don't change their limits. */
if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) {
if (iscsilun->lbp.lbpu) {
if (iscsilun->bl.max_unmap < 0xffffffff) {
bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap,
iscsilun);
}
bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
iscsilun);
}
if (iscsilun->bl.max_ws_len < 0xffffffff) {
bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len,
iscsilun);
}
if (iscsilun->bl.max_ws_len < 0xffffffff) {
bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len,
iscsilun);
}
if (iscsilun->lbp.lbpws) {
bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
iscsilun);
}