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102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 Western Digital Corporation or its affiliates.
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*/
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#include <linux/blkdev.h>
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#include "dm-core.h"
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/*
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* User facing dm device block device report zone operation. This calls the
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* report_zones operation for each target of a device table. This operation is
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* generally implemented by targets using dm_report_zones().
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*/
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int dm_blk_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 mapped_device *md = disk->private_data;
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struct dm_table *map;
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int srcu_idx, ret;
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struct dm_report_zones_args args = {
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.next_sector = sector,
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.orig_data = data,
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.orig_cb = cb,
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};
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if (dm_suspended_md(md))
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return -EAGAIN;
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map = dm_get_live_table(md, &srcu_idx);
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if (!map) {
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ret = -EIO;
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goto out;
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}
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do {
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struct dm_target *tgt;
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tgt = dm_table_find_target(map, args.next_sector);
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if (WARN_ON_ONCE(!tgt->type->report_zones)) {
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ret = -EIO;
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goto out;
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}
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args.tgt = tgt;
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ret = tgt->type->report_zones(tgt, &args,
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nr_zones - args.zone_idx);
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if (ret < 0)
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goto out;
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} while (args.zone_idx < nr_zones &&
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args.next_sector < get_capacity(disk));
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ret = args.zone_idx;
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out:
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dm_put_live_table(md, srcu_idx);
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return ret;
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}
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int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data)
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{
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struct dm_report_zones_args *args = data;
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sector_t sector_diff = args->tgt->begin - args->start;
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/*
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* Ignore zones beyond the target range.
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*/
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if (zone->start >= args->start + args->tgt->len)
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return 0;
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/*
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* Remap the start sector and write pointer position of the zone
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* to match its position in the target range.
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*/
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zone->start += sector_diff;
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if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
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if (zone->cond == BLK_ZONE_COND_FULL)
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zone->wp = zone->start + zone->len;
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else if (zone->cond == BLK_ZONE_COND_EMPTY)
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zone->wp = zone->start;
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else
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zone->wp += sector_diff;
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}
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args->next_sector = zone->start + zone->len;
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return args->orig_cb(zone, args->zone_idx++, args->orig_data);
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}
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EXPORT_SYMBOL_GPL(dm_report_zones_cb);
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void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q)
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{
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if (!blk_queue_is_zoned(q))
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return;
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/*
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* For a zoned target, the number of zones should be updated for the
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* correct value to be exposed in sysfs queue/nr_zones. For a BIO based
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* target, this is all that is needed.
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*/
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WARN_ON_ONCE(queue_is_mq(q));
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q->nr_zones = blkdev_nr_zones(t->md->disk);
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}
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