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scsi-disk: support toggling the write cache

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Finally, this uses the "plumbing" in the previous patch to
add support for toggling the WCE bit of the caching mode page.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-07-10 15:03:17 +02:00
parent 380feaffb0
commit 96c91bbf60
1 changed files with 10 additions and 4 deletions
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14
hw/scsi-disk.c
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@ -1050,10 +1050,8 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
case MODE_PAGE_CACHING:
length = 0x12;
if (page_control == 1) { /* Changeable Values */
break;
}
if (bdrv_enable_write_cache(s->qdev.conf.bs)) {
if (page_control == 1 || /* Changeable Values */
bdrv_enable_write_cache(s->qdev.conf.bs)) {
p[0] = 4; /* WCE */
}
break;
@ -1325,6 +1323,14 @@ static int scsi_disk_check_mode_select(SCSIDiskState *s, int page,
static void scsi_disk_apply_mode_select(SCSIDiskState *s, int page, uint8_t *p)
{
switch (page) {
case MODE_PAGE_CACHING:
bdrv_set_enable_write_cache(s->qdev.conf.bs, (p[0] & 4) != 0);
break;
default:
break;
}
}
static int mode_select_pages(SCSIDiskReq *r, uint8_t *p, int len, bool change)