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block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP

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The current check is right for MAY_UNMAP=1.  For MAY_UNMAP=0, just
try and fall back to regular writes as soon as a WRITE SAME command
fails.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-11-22 13:39:54 +01:00 committed by Stefan Hajnoczi
parent 2af8a1a704
commit fa6252b056
1 changed files with 17 additions and 2 deletions
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19
block/iscsi.c
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@ -55,6 +55,7 @@ typedef struct IscsiLun {
QEMUTimer *nop_timer;
uint8_t lbpme;
uint8_t lbprz;
uint8_t has_write_same;
struct scsi_inquiry_logical_block_provisioning lbp;
struct scsi_inquiry_block_limits bl;
unsigned char *zeroblock;
@ -976,8 +977,13 @@ coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
return -EINVAL;
}
if (!iscsilun->lbp.lbpws) {
/* WRITE SAME is not supported by the target */
if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
/* WRITE SAME without UNMAP is not supported by the target */
return -ENOTSUP;
}
if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) {
/* WRITE SAME with UNMAP is not supported by the target */
return -ENOTSUP;
}
@ -1012,6 +1018,14 @@ retry:
}
if (iTask.status != SCSI_STATUS_GOOD) {
if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) {
/* WRITE SAME is not supported by the target */
iscsilun->has_write_same = false;
return -ENOTSUP;
}
return -EIO;
}
@ -1375,6 +1389,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
}
iscsilun->type = inq->periperal_device_type;
iscsilun->has_write_same = true;
if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) {
goto out;