[Qemu-devel] [PATCH 14/15] Prevent CD-ROM media eject while device is locked

[Glauber Costa <glommer@redhat.com>]

From: Mark McLoughlin <markmc@redhat.com>

Section 10.8.25 ("START/STOP UNIT Command") of SFF-8020i states that
if the device is locked we should refuse to eject if the device is
locked.

ASC_MEDIA_REMOVAL_PREVENTED is the appropriate return in this case.

In order to stop itself from ejecting the media it is running from,
Fedora's installer (anaconda) requires the CDROMEJECT ioctl() to fail
if the drive has been previously locked.

See also https://bugzilla.redhat.com/501412

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 block.c  |    9 ++++++++-
 block.h  |    2 +-
 hw/ide.c |   26 ++++++++++++++++++--------
 3 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/block.c b/block.c
index b68a8da..e5cd23d 100644
--- a/block.c
+++ b/block.c
@@ -1664,11 +1664,15 @@ int bdrv_media_changed(BlockDriverState *bs)
 /**
  * If eject_flag is TRUE, eject the media. Otherwise, close the tray
  */
-void bdrv_eject(BlockDriverState *bs, int eject_flag)
+int bdrv_eject(BlockDriverState *bs, int eject_flag)
 {
     BlockDriver *drv = bs->drv;
     int ret;
 
+    if (bs->locked) {
+        return -EBUSY;
+    }
+
     if (!drv || !drv->bdrv_eject) {
         ret = -ENOTSUP;
     } else {
@@ -1677,7 +1681,10 @@ void bdrv_eject(BlockDriverState *bs, int eject_flag)
     if (ret == -ENOTSUP) {
         if (eject_flag)
             bdrv_close(bs);
+        ret = 0;
     }
+
+    return ret;
 }
 
 int bdrv_is_locked(BlockDriverState *bs)
diff --git a/block.h b/block.h
index 979781a..e1070e9 100644
--- a/block.h
+++ b/block.h
@@ -132,7 +132,7 @@ int bdrv_is_inserted(BlockDriverState *bs);
 int bdrv_media_changed(BlockDriverState *bs);
 int bdrv_is_locked(BlockDriverState *bs);
 void bdrv_set_locked(BlockDriverState *bs, int locked);
-void bdrv_eject(BlockDriverState *bs, int eject_flag);
+int bdrv_eject(BlockDriverState *bs, int eject_flag);
 void bdrv_set_change_cb(BlockDriverState *bs,
                         void (*change_cb)(void *opaque), void *opaque);
 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
diff --git a/hw/ide.c b/hw/ide.c
index 6ad1d08..9b93e7f 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -359,6 +359,7 @@
 #define ASC_INCOMPATIBLE_FORMAT              0x30
 #define ASC_MEDIUM_NOT_PRESENT               0x3a
 #define ASC_SAVING_PARAMETERS_NOT_SUPPORTED  0x39
+#define ASC_MEDIA_REMOVAL_PREVENTED          0x53
 
 #define CFA_NO_ERROR            0x00
 #define CFA_MISC_ERROR          0x09
@@ -1818,18 +1819,27 @@ static void ide_atapi_cmd(IDEState *s)
         break;
     case GPCMD_START_STOP_UNIT:
         {
-            int start, eject;
+            int start, eject, err = 0;
             start = packet[4] & 1;
             eject = (packet[4] >> 1) & 1;
 
-            if (eject && !start) {
-                /* eject the disk */
-                bdrv_eject(s->bs, 1);
-            } else if (eject && start) {
-                /* close the tray */
-                bdrv_eject(s->bs, 0);
+            if (eject) {
+                err = bdrv_eject(s->bs, !start);
+            }
+
+            switch (err) {
+            case 0:
+                ide_atapi_cmd_ok(s);
+                break;
+            case -EBUSY:
+                ide_atapi_cmd_error(s, SENSE_NOT_READY,
+                                    ASC_MEDIA_REMOVAL_PREVENTED);
+                break;
+            default:
+                ide_atapi_cmd_error(s, SENSE_NOT_READY,
+                                    ASC_MEDIUM_NOT_PRESENT);
+                break;
             }
-            ide_atapi_cmd_ok(s);
         }
         break;
     case GPCMD_MECHANISM_STATUS:
-- 
1.6.2.2