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scsi-disk: add dpofua property 

Linux expects REQ_FUA to be advertised only if WRITE+FUA is faster than
WRITE+SYNCHRONIZE CACHE, so we should not set the DPOFUA bit.  However,
it is useful to have it for testing purposes, so add a qdev property to
set it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-01 10:25:16 +02:00
parent bfe3d7ac6d
commit da8365dbab
1 changed files with 6 additions and 1 deletions
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7
hw/scsi-disk.c
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@ -62,6 +62,7 @@ typedef struct SCSIDiskReq {
} SCSIDiskReq;
#define SCSI_DISK_F_REMOVABLE 0
#define SCSI_DISK_F_DPOFUA 1
struct SCSIDiskState
{
@ -1103,7 +1104,7 @@ static int scsi_disk_emulate_mode_sense(SCSIDiskReq *r, uint8_t *outbuf)
p = outbuf;
if (s->qdev.type == TYPE_DISK) {
dev_specific_param = 0x10; /* DPOFUA */
dev_specific_param = s->features & (1 << SCSI_DISK_F_DPOFUA) ? 0x10 : 0;
if (bdrv_is_read_only(s->qdev.conf.bs)) {
dev_specific_param |= 0x80; /* Readonly. */
}
@ -1935,6 +1936,8 @@ static Property scsi_hd_properties[] = {
DEFINE_SCSI_DISK_PROPERTIES(),
DEFINE_PROP_BIT("removable", SCSIDiskState, features,
SCSI_DISK_F_REMOVABLE, false),
DEFINE_PROP_BIT("dpofua", SCSIDiskState, features,
SCSI_DISK_F_DPOFUA, false),
DEFINE_PROP_END_OF_LIST(),
};
@ -2038,6 +2041,8 @@ static Property scsi_disk_properties[] = {
DEFINE_SCSI_DISK_PROPERTIES(),
DEFINE_PROP_BIT("removable", SCSIDiskState, features,
SCSI_DISK_F_REMOVABLE, false),
DEFINE_PROP_BIT("dpofua", SCSIDiskState, features,
SCSI_DISK_F_DPOFUA, false),
DEFINE_PROP_END_OF_LIST(),
};