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block/iscsi: query for supported VPD pages 

this patch ensures that we only query for block provisioning and
block limits vpd pages if they are advertised. It also cleans
up the inquiry code and eliminates some redundant code.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2014-02-17 18:34:08 +01:00 committed by Paolo Bonzini
parent 837c390137
commit 24d3bd67ac
1 changed files with 58 additions and 57 deletions
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115
block/iscsi.c
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@ -1067,7 +1067,7 @@ static QemuOptsList runtime_opts = {
};
static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
int evpd, int pc, Error **errp)
int evpd, int pc, void **inq, Error **errp)
{
int full_size;
struct scsi_task *task = NULL;
@ -1086,14 +1086,19 @@ static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
}
}
*inq = scsi_datain_unmarshall(task);
if (*inq == NULL) {
error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
goto fail;
}
return task;
fail:
error_setg(errp, "iSCSI: Inquiry command failed : %s",
iscsi_get_error(iscsi));
if (task) {
if (task != NULL) {
scsi_free_scsi_task(task);
return NULL;
}
return NULL;
}
@ -1114,11 +1119,12 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
struct iscsi_url *iscsi_url = NULL;
struct scsi_task *task = NULL;
struct scsi_inquiry_standard *inq = NULL;
struct scsi_inquiry_supported_pages *inq_vpd;
char *initiator_name = NULL;
QemuOpts *opts;
Error *local_err = NULL;
const char *filename;
int ret;
int i, ret;
if ((BDRV_SECTOR_SIZE % 512) != 0) {
error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. "
@ -1204,25 +1210,18 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
iscsilun->iscsi = iscsi;
iscsilun->lun = iscsi_url->lun;
task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
error_setg(errp, "iSCSI: failed to send inquiry command.");
ret = -EINVAL;
goto out;
}
inq = scsi_datain_unmarshall(task);
if (inq == NULL) {
error_setg(errp, "iSCSI: Failed to unmarshall inquiry data.");
ret = -EINVAL;
goto out;
}
iscsilun->type = inq->periperal_device_type;
iscsilun->has_write_same = true;
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
(void **) &inq, errp);
if (task == NULL) {
ret = -EINVAL;
goto out;
}
iscsilun->type = inq->periperal_device_type;
scsi_free_scsi_task(task);
task = NULL;
iscsi_readcapacity_sync(iscsilun, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
@ -1240,46 +1239,48 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
bs->sg = 1;
}
if (iscsilun->lbpme) {
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
(void **) &inq_vpd, errp);
if (task == NULL) {
ret = -EINVAL;
goto out;
}
for (i = 0; i < inq_vpd->num_pages; i++) {
struct scsi_task *inq_task;
struct scsi_inquiry_logical_block_provisioning *inq_lbp;
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
errp);
if (task == NULL) {
ret = -EINVAL;
goto out;
}
inq_lbp = scsi_datain_unmarshall(task);
if (inq_lbp == NULL) {
error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
ret = -EINVAL;
goto out;
}
memcpy(&iscsilun->lbp, inq_lbp,
sizeof(struct scsi_inquiry_logical_block_provisioning));
scsi_free_scsi_task(task);
task = NULL;
}
if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) {
struct scsi_inquiry_block_limits *inq_bl;
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, errp);
if (task == NULL) {
ret = -EINVAL;
goto out;
switch (inq_vpd->pages[i]) {
case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
(void **) &inq_lbp, errp);
if (inq_task == NULL) {
ret = -EINVAL;
goto out;
}
memcpy(&iscsilun->lbp, inq_lbp,
sizeof(struct scsi_inquiry_logical_block_provisioning));
scsi_free_scsi_task(inq_task);
break;
case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
(void **) &inq_bl, errp);
if (inq_task == NULL) {
ret = -EINVAL;
goto out;
}
memcpy(&iscsilun->bl, inq_bl,
sizeof(struct scsi_inquiry_block_limits));
scsi_free_scsi_task(inq_task);
break;
default:
break;
}
inq_bl = scsi_datain_unmarshall(task);
if (inq_bl == NULL) {
error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
ret = -EINVAL;
goto out;
}
memcpy(&iscsilun->bl, inq_bl,
sizeof(struct scsi_inquiry_block_limits));
scsi_free_scsi_task(task);
task = NULL;
}
scsi_free_scsi_task(task);
task = NULL;
#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
/* Set up a timer for sending out iSCSI NOPs */