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From 9273caf09add518239e77f02081bc4f455e24425 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 10 Mar 2014 11:07:21 +0100
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Subject: [PATCH 13/16] iscsi: Use bs->sg for everything else than disks
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <1394449642-13562-2-git-send-email-kwolf@redhat.com>
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Patchwork-id: 58063
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 1/2] iscsi: Use bs->sg for everything else than disks
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Bugzilla: 1067784
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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The current iscsi block driver code makes the rather arbitrary decision
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that TYPE_MEDIUM_CHANGER and TYPE_TAPE devices have bs->sg = 1 and all
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other device types are disks.
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Instead of this, check for TYPE_DISK to expose the disk interface and
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make everything else bs->sg = 1. In particular, this includes devices
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with TYPE_STORAGE_ARRAY, which is what LUN 0 of an iscsi target is.
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(See https://bugzilla.redhat.com/show_bug.cgi?id=1067784 for the exact
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scenario.)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Benoit Canet <benoit@irqsave.net>
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Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit f47c3f5a800a927238d20de9f99b5c77f0bc3fe0)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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block/iscsi.c | 9 ++++-----
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1 file changed, 4 insertions(+), 5 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/iscsi.c | 9 ++++-----
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1 files changed, 4 insertions(+), 5 deletions(-)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index 63a21e2..64a8295 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -1399,12 +1399,11 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
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bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
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bs->request_alignment = iscsilun->block_size;
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- /* Medium changer or tape. We dont have any emulation for this so this must
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- * be sg ioctl compatible. We force it to be sg, otherwise qemu will try
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- * to read from the device to guess the image format.
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+ /* We don't have any emulation for devices other than disks and CD-ROMs, so
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+ * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
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+ * will try to read from the device to guess the image format.
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*/
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- if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
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- iscsilun->type == TYPE_TAPE) {
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+ if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
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bs->sg = 1;
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}
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--
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1.7.1
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