block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP
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>
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@ -55,6 +55,7 @@ typedef struct IscsiLun {
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QEMUTimer *nop_timer;
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uint8_t lbpme;
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uint8_t lbprz;
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uint8_t has_write_same;
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struct scsi_inquiry_logical_block_provisioning lbp;
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struct scsi_inquiry_block_limits bl;
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unsigned char *zeroblock;
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@ -976,8 +977,13 @@ coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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return -EINVAL;
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}
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if (!iscsilun->lbp.lbpws) {
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/* WRITE SAME is not supported by the target */
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if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
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/* WRITE SAME without UNMAP is not supported by the target */
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return -ENOTSUP;
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}
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if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) {
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/* WRITE SAME with UNMAP is not supported by the target */
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return -ENOTSUP;
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}
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@ -1012,6 +1018,14 @@ retry:
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}
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if (iTask.status != SCSI_STATUS_GOOD) {
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if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
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iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
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iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) {
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/* WRITE SAME is not supported by the target */
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iscsilun->has_write_same = false;
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return -ENOTSUP;
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}
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return -EIO;
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}
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@ -1375,6 +1389,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
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}
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iscsilun->type = inq->periperal_device_type;
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iscsilun->has_write_same = true;
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if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) {
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goto out;
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