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From 615429e3068cb4a3e57ee60d52f318aa6ca06f6d Mon Sep 17 00:00:00 2001
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Message-Id: <615429e3068cb4a3e57ee60d52f318aa6ca06f6d.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:09:22 +0100
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Subject: [PATCH 34/50] block/iscsi: check WRITE SAME support differently
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depending on MAY_UNMAP
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-37-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56073
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 36/52] block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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The current check is right for MAY_UNMAP=1. For MAY_UNMAP=0, just
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try and fall back to regular writes as soon as a WRITE SAME command
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fails.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Peter Lieven <pl@kamp.de>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit fa6252b0565526ec2347e248172f91771e0d9f47)
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---
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block/iscsi.c | 19 +++++++++++++++++--
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1 file changed, 17 insertions(+), 2 deletions(-)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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block/iscsi.c | 19 +++++++++++++++++--
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1 file changed, 17 insertions(+), 2 deletions(-)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index 7ae61f9..8b82fe7 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -55,6 +55,7 @@ typedef struct IscsiLun {
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QEMUTimer *nop_timer;
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uint8_t lbpme;
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uint8_t lbprz;
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+ uint8_t has_write_same;
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struct scsi_inquiry_logical_block_provisioning lbp;
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struct scsi_inquiry_block_limits bl;
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unsigned char *zeroblock;
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@@ -978,8 +979,13 @@ coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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return -EINVAL;
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}
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- if (!iscsilun->lbp.lbpws) {
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- /* WRITE SAME is not supported by the target */
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+ if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
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+ /* WRITE SAME without UNMAP is not supported by the target */
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+ return -ENOTSUP;
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+ }
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+
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+ if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) {
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+ /* WRITE SAME with UNMAP is not supported by the target */
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return -ENOTSUP;
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}
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@@ -1014,6 +1020,14 @@ retry:
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}
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if (iTask.status != SCSI_STATUS_GOOD) {
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+ if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
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+ iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
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+ iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) {
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+ /* WRITE SAME is not supported by the target */
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+ iscsilun->has_write_same = false;
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+ return -ENOTSUP;
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+ }
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+
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return -EIO;
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}
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@@ -1377,6 +1391,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
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}
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iscsilun->type = inq->periperal_device_type;
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+ iscsilun->has_write_same = true;
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if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) {
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goto out;
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--
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1.7.11.7
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