mirror of https://gitee.com/openkylin/linux.git
223 lines
5.5 KiB
C
223 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/vmalloc.h>
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#include "null_blk.h"
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/* zone_size in MBs to sectors. */
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#define ZONE_SIZE_SHIFT 11
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static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
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{
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return sect >> ilog2(dev->zone_size_sects);
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}
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int null_zone_init(struct nullb_device *dev)
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{
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sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
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sector_t sector = 0;
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unsigned int i;
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if (!is_power_of_2(dev->zone_size)) {
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pr_err("zone_size must be power-of-two\n");
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return -EINVAL;
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}
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dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
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dev->nr_zones = dev_size >>
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(SECTOR_SHIFT + ilog2(dev->zone_size_sects));
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dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
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GFP_KERNEL | __GFP_ZERO);
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if (!dev->zones)
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return -ENOMEM;
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if (dev->zone_nr_conv >= dev->nr_zones) {
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dev->zone_nr_conv = dev->nr_zones - 1;
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pr_info("changed the number of conventional zones to %u",
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dev->zone_nr_conv);
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}
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for (i = 0; i < dev->zone_nr_conv; i++) {
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struct blk_zone *zone = &dev->zones[i];
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zone->start = sector;
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zone->len = dev->zone_size_sects;
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zone->wp = zone->start + zone->len;
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zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
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zone->cond = BLK_ZONE_COND_NOT_WP;
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sector += dev->zone_size_sects;
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}
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for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
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struct blk_zone *zone = &dev->zones[i];
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zone->start = zone->wp = sector;
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zone->len = dev->zone_size_sects;
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zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
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zone->cond = BLK_ZONE_COND_EMPTY;
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sector += dev->zone_size_sects;
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}
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return 0;
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}
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void null_zone_exit(struct nullb_device *dev)
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{
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kvfree(dev->zones);
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}
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int null_report_zones(struct gendisk *disk, sector_t sector,
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unsigned int nr_zones, report_zones_cb cb, void *data)
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{
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struct nullb *nullb = disk->private_data;
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struct nullb_device *dev = nullb->dev;
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unsigned int first_zone, i;
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struct blk_zone zone;
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int error;
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first_zone = null_zone_no(dev, sector);
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if (first_zone >= dev->nr_zones)
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return 0;
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nr_zones = min(nr_zones, dev->nr_zones - first_zone);
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for (i = 0; i < nr_zones; i++) {
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/*
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* Stacked DM target drivers will remap the zone information by
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* modifying the zone information passed to the report callback.
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* So use a local copy to avoid corruption of the device zone
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* array.
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*/
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memcpy(&zone, &dev->zones[first_zone + i],
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sizeof(struct blk_zone));
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error = cb(&zone, i, data);
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if (error)
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return error;
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}
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return nr_zones;
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}
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size_t null_zone_valid_read_len(struct nullb *nullb,
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sector_t sector, unsigned int len)
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{
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struct nullb_device *dev = nullb->dev;
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struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
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unsigned int nr_sectors = len >> SECTOR_SHIFT;
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/* Read must be below the write pointer position */
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
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sector + nr_sectors <= zone->wp)
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return len;
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if (sector > zone->wp)
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return 0;
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return (zone->wp - sector) << SECTOR_SHIFT;
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}
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static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
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unsigned int nr_sectors)
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{
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struct nullb_device *dev = cmd->nq->dev;
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unsigned int zno = null_zone_no(dev, sector);
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struct blk_zone *zone = &dev->zones[zno];
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switch (zone->cond) {
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case BLK_ZONE_COND_FULL:
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/* Cannot write to a full zone */
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cmd->error = BLK_STS_IOERR;
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return BLK_STS_IOERR;
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case BLK_ZONE_COND_EMPTY:
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case BLK_ZONE_COND_IMP_OPEN:
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/* Writes must be at the write pointer position */
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if (sector != zone->wp)
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return BLK_STS_IOERR;
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if (zone->cond == BLK_ZONE_COND_EMPTY)
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zone->cond = BLK_ZONE_COND_IMP_OPEN;
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zone->wp += nr_sectors;
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if (zone->wp == zone->start + zone->len)
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zone->cond = BLK_ZONE_COND_FULL;
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break;
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case BLK_ZONE_COND_NOT_WP:
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break;
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default:
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/* Invalid zone condition */
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return BLK_STS_IOERR;
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}
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return BLK_STS_OK;
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}
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static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
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sector_t sector)
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{
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struct nullb_device *dev = cmd->nq->dev;
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struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
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size_t i;
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switch (op) {
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case REQ_OP_ZONE_RESET_ALL:
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for (i = 0; i < dev->nr_zones; i++) {
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if (zone[i].type == BLK_ZONE_TYPE_CONVENTIONAL)
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continue;
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zone[i].cond = BLK_ZONE_COND_EMPTY;
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zone[i].wp = zone[i].start;
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}
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break;
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case REQ_OP_ZONE_RESET:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_EMPTY;
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zone->wp = zone->start;
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break;
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case REQ_OP_ZONE_OPEN:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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if (zone->cond == BLK_ZONE_COND_FULL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_EXP_OPEN;
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break;
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case REQ_OP_ZONE_CLOSE:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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if (zone->cond == BLK_ZONE_COND_FULL)
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return BLK_STS_IOERR;
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if (zone->wp == zone->start)
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zone->cond = BLK_ZONE_COND_EMPTY;
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else
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zone->cond = BLK_ZONE_COND_CLOSED;
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break;
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case REQ_OP_ZONE_FINISH:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_FULL;
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zone->wp = zone->start + zone->len;
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break;
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default:
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return BLK_STS_NOTSUPP;
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}
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return BLK_STS_OK;
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}
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blk_status_t null_handle_zoned(struct nullb_cmd *cmd, enum req_opf op,
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sector_t sector, sector_t nr_sectors)
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{
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switch (op) {
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case REQ_OP_WRITE:
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return null_zone_write(cmd, sector, nr_sectors);
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case REQ_OP_ZONE_RESET:
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case REQ_OP_ZONE_RESET_ALL:
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case REQ_OP_ZONE_OPEN:
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case REQ_OP_ZONE_CLOSE:
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case REQ_OP_ZONE_FINISH:
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return null_zone_mgmt(cmd, op, sector);
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default:
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return BLK_STS_OK;
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}
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}
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