[Qemu-devel] [PATCH] xen_disk: move sanity check to the correct place

[Qemu-devel] [PATCH] xen_disk: move sanity check to the correct place

[Gerd Hoffmann]

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   Hi,

The sanity check which refuses write access to disks configured 
read-only is at the wrong place.  This patch fixes it.

please apply,

   Gerd

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>From d4a9e1a335efd0e2e753e1752570b0dd527a12bc Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 22 Apr 2009 12:53:01 +0200
Subject: [PATCH 01/21] xen_disk: move sanity check to the correct place

---
 hw/xen_disk.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index f95e373..659a839 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -179,10 +179,6 @@ static int ioreq_parse(struct ioreq *ioreq)
     switch (ioreq->req.operation) {
     case BLKIF_OP_READ:
 	ioreq->prot = PROT_WRITE; /* to memory */
-        if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
-	    xen_be_printf(&blkdev->xendev, 0, "error: write req for ro device\n");
-	    goto err;
-	}
 	break;
     case BLKIF_OP_WRITE_BARRIER:
 	if (!syncwrite)
@@ -199,6 +195,11 @@ static int ioreq_parse(struct ioreq *ioreq)
 	goto err;
     };
 
+    if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
+        xen_be_printf(&blkdev->xendev, 0, "error: write req for ro device\n");
+        goto err;
+    }
+
     ioreq->start = ioreq->req.sector_number * blkdev->file_blk;
     for (i = 0; i < ioreq->req.nr_segments; i++) {
 	if (i == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
-- 
1.6.2.2