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Prevent CD-ROM media eject while device is locked

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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>
This commit is contained in:
Mark McLoughlin 2009-05-27 10:06:11 +01:00 committed by Anthony Liguori
parent 2ea42952ee
commit aea2a33c73
3 changed files with 27 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
block.c
View File

@ -1566,11 +1566,15 @@ 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 {
@ -1579,7 +1583,10 @@ 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)

2
block.h
View File

@ -124,7 +124,7 @@ 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);

26
hw/ide.c
View File

@ -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
@ -1822,18 +1823,27 @@ 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: