Re: [PATCH v3] virtio_blk: add VIRTIO_BLK_F_LIFETIME feature support

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On 12/5/22 08:20, Alvaro Karsz wrote:
+/* Get lifetime information struct for each request */
+struct virtio_blk_lifetime {
+	/*
+	 * specifies the percentage of reserved blocks that are consumed.
+	 * optional values following virtio spec:
+	 * 0 - undefined
+	 * 1 - normal, < 80% of reserved blocks are consumed
+	 * 2 - warning, 80% of reserved blocks are consumed
+	 * 3 - urgent, 90% of reserved blocks are consumed
+	 */
+	__le16 pre_eol_info;
+	/*
+	 * this field refers to wear of SLC cells and is provided in increments of 10used,
+	 * and so on, thru to 11 meaning estimated lifetime exceeded. All values above 11
+	 * are reserved
+	 */
+	__le16 device_lifetime_est_typ_a;
+	/*
+	 * this field refers to wear of MLC cells and is provided with the same semantics as
+	 * device_lifetime_est_typ_a
+	 */
+	__le16 device_lifetime_est_typ_b;
+};

Why does the above data structure only refer to SLC and MLC but not to
TLC or QLC?

How will this data structure be extended without having to introduce a
new ioctl?

Thanks,

Bart.

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