block: add capacity field to zone descriptors

In the zoned storage model, the sectors within a zone are typically all writeable. With the introduction of the Zoned Namespace (ZNS) Command Set in the NVM Express organization, the model was extended to have a specific writeable capacity. Extend the zone descriptor data structure with a zone capacity field to indicate to the user how many sectors in a zone are writeable. Introduce backward compatibility in the zone report ioctl by extending the zone report header data structure with a flags field to indicate if the capacity field is available.

Matias Bjørling committed 6 years ago

Commit 82394db1 parent f5af5774 files · +17 −2Browse files

Showing the changes to include/uapi/linux (1 of 4 files). Show all

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include/uapi/linux/blkzoned.h+13−2

@@ -73,6 +73,15 @@ enum blk_zone_cond { · 72 unmodified lines
73	73	BLK_ZONE_COND_OFFLINE = 0xF,
74	74	};
75	75
	76	+/**
	77	+ * enum blk_zone_report_flags - Feature flags of reported zone descriptors.
	78	+ *
	79	+ * @BLK_ZONE_REP_CAPACITY: Zone descriptor has capacity field.
	80	+ */
	81	+enum blk_zone_report_flags {
	82	+ BLK_ZONE_REP_CAPACITY = (1 << 0),
	83	+};
	84	+
76	85	/**
77	86	* struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
78	87	*
@@ -99,7 +108,9 @@ struct blk_zone { · 20 unmodified lines
99	108	__u8 cond; /* Zone condition */
100	109	__u8 non_seq; /* Non-sequential write resources active */
101	110	__u8 reset; /* Reset write pointer recommended */
102		− __u8 reserved[36];
	111	+ __u8 resv[4];
	112	+ __u64 capacity; /* Zone capacity in number of sectors */
	113	+ __u8 reserved[24];
103	114	};
104	115
105	116	/**
@@ -115,7 +126,7 @@ struct blk_zone { · 9 unmodified lines
115	126	struct blk_zone_report {
116	127	__u64 sector;
117	128	__u32 nr_zones;
118		− __u8 reserved[4];
	129	+ __u32 flags;
119	130	struct blk_zone zones[0];
120	131	};
121	132