From 615429e3068cb4a3e57ee60d52f318aa6ca06f6d Mon Sep 17 00:00:00 2001 Message-Id: <615429e3068cb4a3e57ee60d52f318aa6ca06f6d.1389014116.git.minovotn@redhat.com> In-Reply-To: References: From: Paolo Bonzini Date: Mon, 9 Dec 2013 14:09:22 +0100 Subject: [PATCH 34/50] block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP RH-Author: Paolo Bonzini Message-id: <1386598178-11845-37-git-send-email-pbonzini@redhat.com> Patchwork-id: 56073 O-Subject: [RHEL 7.0 qemu-kvm PATCH 36/52] block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP Bugzilla: 1007815 RH-Acked-by: Jeffrey Cody RH-Acked-by: Fam Zheng RH-Acked-by: Stefan Hajnoczi The current check is right for MAY_UNMAP=1. For MAY_UNMAP=0, just try and fall back to regular writes as soon as a WRITE SAME command fails. Signed-off-by: Paolo Bonzini Reviewed-by: Peter Lieven Signed-off-by: Stefan Hajnoczi (cherry picked from commit fa6252b0565526ec2347e248172f91771e0d9f47) --- block/iscsi.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) Signed-off-by: Michal Novotny --- block/iscsi.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/block/iscsi.c b/block/iscsi.c index 7ae61f9..8b82fe7 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -55,6 +55,7 @@ typedef struct IscsiLun { QEMUTimer *nop_timer; uint8_t lbpme; uint8_t lbprz; + uint8_t has_write_same; struct scsi_inquiry_logical_block_provisioning lbp; struct scsi_inquiry_block_limits bl; unsigned char *zeroblock; @@ -978,8 +979,13 @@ coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, return -EINVAL; } - if (!iscsilun->lbp.lbpws) { - /* WRITE SAME is not supported by the target */ + if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { + /* WRITE SAME without UNMAP is not supported by the target */ + return -ENOTSUP; + } + + if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { + /* WRITE SAME with UNMAP is not supported by the target */ return -ENOTSUP; } @@ -1014,6 +1020,14 @@ retry: } if (iTask.status != SCSI_STATUS_GOOD) { + if (iTask.status == SCSI_STATUS_CHECK_CONDITION && + iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && + iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) { + /* WRITE SAME is not supported by the target */ + iscsilun->has_write_same = false; + return -ENOTSUP; + } + return -EIO; } @@ -1377,6 +1391,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, } iscsilun->type = inq->periperal_device_type; + iscsilun->has_write_same = true; if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { goto out; -- 1.7.11.7