Patchwork [15/31] savevm: Include writable devices with removable media

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Submitter Kevin Wolf
Date Sept. 6, 2011, 3:39 p.m.
Message ID <1315323586-23840-16-git-send-email-kwolf@redhat.com>
Download mbox | patch
Permalink /patch/113603/
State New
Headers show

Comments

Kevin Wolf - Sept. 6, 2011, 3:39 p.m.
From: Markus Armbruster <armbru@redhat.com>

savevm and loadvm silently ignore block devices with removable media,
such as floppies and SD cards.  Rolling back a VM to a previous
checkpoint will *not* roll back writes to block devices with removable
media.

Moreover, bdrv_is_removable() is a confused mess, and wrong in at
least one case: it considers "-drive if=xen,media=cdrom -M xenpv"
removable.  It'll be cleaned up later in this series.

Read-only block devices are also ignored, but that's okay.

Fix by ignoring only read-only block devices and empty block devices.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c  |    2 +-
 savevm.c |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/block.c b/block.c
index 487a6a9..a8c789a 100644
--- a/block.c
+++ b/block.c
@@ -2097,7 +2097,7 @@  void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
 int bdrv_can_snapshot(BlockDriverState *bs)
 {
     BlockDriver *drv = bs->drv;
-    if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
+    if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
         return 0;
     }
 
diff --git a/savevm.c b/savevm.c
index b06308b..1feaa70 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1914,7 +1914,7 @@  void do_savevm(Monitor *mon, const QDict *qdict)
     bs = NULL;
     while ((bs = bdrv_next(bs))) {
 
-        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
+        if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
             continue;
         }
 
@@ -2034,7 +2034,7 @@  int load_vmstate(const char *name)
     bs = NULL;
     while ((bs = bdrv_next(bs))) {
 
-        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
+        if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
             continue;
         }