From d353fb72f59cd0e1f67baf773e74719cda761a89 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 19 May 2011 10:58:19 +0200
Subject: ide: add TRIM support

Add support for TRIM sub function of the data set management command,
and wire it up to the qemu discard infrastructure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/ide/qdev.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'hw/ide/qdev.c')

diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 3f9dc89c6d..d9b8f24bb5 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -125,6 +125,11 @@ static int ide_dev_initfn(IDEDevice *dev, IDEDriveKind kind)
     const char *serial;
     DriveInfo *dinfo;
 
+    if (dev->conf.discard_granularity && dev->conf.discard_granularity != 512) {
+        error_report("discard_granularity must be 512 for ide");
+        return -1;
+    }
+
     serial = dev->serial;
     if (!serial) {
         /* try to fall back to value set with legacy -drive serial=... */
-- 
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