1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/vmalloc.h>
5 /* zone_size in MBs to sectors. */
6 #define ZONE_SIZE_SHIFT 11
8 static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
10 return sect >> ilog2(dev->zone_size_sects);
13 int null_zone_init(struct nullb_device *dev)
15 sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
19 if (!is_power_of_2(dev->zone_size)) {
20 pr_err("zone_size must be power-of-two\n");
24 dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
25 dev->nr_zones = dev_size >>
26 (SECTOR_SHIFT + ilog2(dev->zone_size_sects));
27 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
28 GFP_KERNEL | __GFP_ZERO);
32 if (dev->zone_nr_conv >= dev->nr_zones) {
33 dev->zone_nr_conv = dev->nr_zones - 1;
34 pr_info("changed the number of conventional zones to %u",
38 for (i = 0; i < dev->zone_nr_conv; i++) {
39 struct blk_zone *zone = &dev->zones[i];
42 zone->len = dev->zone_size_sects;
43 zone->wp = zone->start + zone->len;
44 zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
45 zone->cond = BLK_ZONE_COND_NOT_WP;
47 sector += dev->zone_size_sects;
50 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
51 struct blk_zone *zone = &dev->zones[i];
53 zone->start = zone->wp = sector;
54 zone->len = dev->zone_size_sects;
55 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
56 zone->cond = BLK_ZONE_COND_EMPTY;
58 sector += dev->zone_size_sects;
64 void null_zone_exit(struct nullb_device *dev)
69 int null_report_zones(struct gendisk *disk, sector_t sector,
70 unsigned int nr_zones, report_zones_cb cb, void *data)
72 struct nullb *nullb = disk->private_data;
73 struct nullb_device *dev = nullb->dev;
74 unsigned int first_zone, i;
78 first_zone = null_zone_no(dev, sector);
79 if (first_zone >= dev->nr_zones)
82 nr_zones = min(nr_zones, dev->nr_zones - first_zone);
83 for (i = 0; i < nr_zones; i++) {
85 * Stacked DM target drivers will remap the zone information by
86 * modifying the zone information passed to the report callback.
87 * So use a local copy to avoid corruption of the device zone
90 memcpy(&zone, &dev->zones[first_zone + i],
91 sizeof(struct blk_zone));
92 error = cb(&zone, i, data);
100 size_t null_zone_valid_read_len(struct nullb *nullb,
101 sector_t sector, unsigned int len)
103 struct nullb_device *dev = nullb->dev;
104 struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
105 unsigned int nr_sectors = len >> SECTOR_SHIFT;
107 /* Read must be below the write pointer position */
108 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
109 sector + nr_sectors <= zone->wp)
112 if (sector > zone->wp)
115 return (zone->wp - sector) << SECTOR_SHIFT;
118 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
119 unsigned int nr_sectors)
121 struct nullb_device *dev = cmd->nq->dev;
122 unsigned int zno = null_zone_no(dev, sector);
123 struct blk_zone *zone = &dev->zones[zno];
125 switch (zone->cond) {
126 case BLK_ZONE_COND_FULL:
127 /* Cannot write to a full zone */
128 cmd->error = BLK_STS_IOERR;
129 return BLK_STS_IOERR;
130 case BLK_ZONE_COND_EMPTY:
131 case BLK_ZONE_COND_IMP_OPEN:
132 case BLK_ZONE_COND_EXP_OPEN:
133 case BLK_ZONE_COND_CLOSED:
134 /* Writes must be at the write pointer position */
135 if (sector != zone->wp)
136 return BLK_STS_IOERR;
138 if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
139 zone->cond = BLK_ZONE_COND_IMP_OPEN;
141 zone->wp += nr_sectors;
142 if (zone->wp == zone->start + zone->len)
143 zone->cond = BLK_ZONE_COND_FULL;
145 case BLK_ZONE_COND_NOT_WP:
148 /* Invalid zone condition */
149 return BLK_STS_IOERR;
154 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
157 struct nullb_device *dev = cmd->nq->dev;
158 struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
162 case REQ_OP_ZONE_RESET_ALL:
163 for (i = 0; i < dev->nr_zones; i++) {
164 if (zone[i].type == BLK_ZONE_TYPE_CONVENTIONAL)
166 zone[i].cond = BLK_ZONE_COND_EMPTY;
167 zone[i].wp = zone[i].start;
170 case REQ_OP_ZONE_RESET:
171 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
172 return BLK_STS_IOERR;
174 zone->cond = BLK_ZONE_COND_EMPTY;
175 zone->wp = zone->start;
177 case REQ_OP_ZONE_OPEN:
178 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
179 return BLK_STS_IOERR;
180 if (zone->cond == BLK_ZONE_COND_FULL)
181 return BLK_STS_IOERR;
183 zone->cond = BLK_ZONE_COND_EXP_OPEN;
185 case REQ_OP_ZONE_CLOSE:
186 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
187 return BLK_STS_IOERR;
188 if (zone->cond == BLK_ZONE_COND_FULL)
189 return BLK_STS_IOERR;
191 if (zone->wp == zone->start)
192 zone->cond = BLK_ZONE_COND_EMPTY;
194 zone->cond = BLK_ZONE_COND_CLOSED;
196 case REQ_OP_ZONE_FINISH:
197 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
198 return BLK_STS_IOERR;
200 zone->cond = BLK_ZONE_COND_FULL;
201 zone->wp = zone->start + zone->len;
204 return BLK_STS_NOTSUPP;
209 blk_status_t null_handle_zoned(struct nullb_cmd *cmd, enum req_opf op,
210 sector_t sector, sector_t nr_sectors)
214 return null_zone_write(cmd, sector, nr_sectors);
215 case REQ_OP_ZONE_RESET:
216 case REQ_OP_ZONE_RESET_ALL:
217 case REQ_OP_ZONE_OPEN:
218 case REQ_OP_ZONE_CLOSE:
219 case REQ_OP_ZONE_FINISH:
220 return null_zone_mgmt(cmd, op, sector);