projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7fc18728 DLM |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* | |
| 3 | * Copyright (C) 2021 Western Digital Corporation or its affiliates. | |
| 4 | */ | |
| 5 | ||
| 6 | #include <linux/blkdev.h> | |
| 7 | ||
| 8 | #include "dm-core.h" | |
| 9 | ||
| 10 | /* | |
| 11 | * User facing dm device block device report zone operation. This calls the | |
| 12 | * report_zones operation for each target of a device table. This operation is | |
| 13 | * generally implemented by targets using dm_report_zones(). | |
| 14 | */ | |
| 15 | int dm_blk_report_zones(struct gendisk *disk, sector_t sector, | |
| 16 | unsigned int nr_zones, report_zones_cb cb, void *data) | |
| 17 | { | |
| 18 | struct mapped_device *md = disk->private_data; | |
| 19 | struct dm_table *map; | |
| 20 | int srcu_idx, ret; | |
| 21 | struct dm_report_zones_args args = { | |
| 22 | .next_sector = sector, | |
| 23 | .orig_data = data, | |
| 24 | .orig_cb = cb, | |
| 25 | }; | |
| 26 | ||
| 27 | if (dm_suspended_md(md)) | |
| 28 | return -EAGAIN; | |
| 29 | ||
| 30 | map = dm_get_live_table(md, &srcu_idx); | |
| 31 | if (!map) { | |
| 32 | ret = -EIO; | |
| 33 | goto out; | |
| 34 | } | |
| 35 | ||
| 36 | do { | |
| 37 | struct dm_target *tgt; | |
| 38 | ||
| 39 | tgt = dm_table_find_target(map, args.next_sector); | |
| 40 | if (WARN_ON_ONCE(!tgt->type->report_zones)) { | |
| 41 | ret = -EIO; | |
| 42 | goto out; | |
| 43 | } | |
| 44 | ||
| 45 | args.tgt = tgt; | |
| 46 | ret = tgt->type->report_zones(tgt, &args, | |
| 47 | nr_zones - args.zone_idx); | |
| 48 | if (ret < 0) | |
| 49 | goto out; | |
| 50 | } while (args.zone_idx < nr_zones && | |
| 51 | args.next_sector < get_capacity(disk)); | |
| 52 | ||
| 53 | ret = args.zone_idx; | |
| 54 | out: | |
| 55 | dm_put_live_table(md, srcu_idx); | |
| 56 | return ret; | |
| 57 | } | |
| 58 | ||
| 59 | int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data) | |
| 60 | { | |
| 61 | struct dm_report_zones_args *args = data; | |
| 62 | sector_t sector_diff = args->tgt->begin - args->start; | |
| 63 | ||
| 64 | /* | |
| 65 | * Ignore zones beyond the target range. | |
| 66 | */ | |
| 67 | if (zone->start >= args->start + args->tgt->len) | |
| 68 | return 0; | |
| 69 | ||
| 70 | /* | |
| 71 | * Remap the start sector and write pointer position of the zone | |
| 72 | * to match its position in the target range. | |
| 73 | */ | |
| 74 | zone->start += sector_diff; | |
| 75 | if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) { | |
| 76 | if (zone->cond == BLK_ZONE_COND_FULL) | |
| 77 | zone->wp = zone->start + zone->len; | |
| 78 | else if (zone->cond == BLK_ZONE_COND_EMPTY) | |
| 79 | zone->wp = zone->start; | |
| 80 | else | |
| 81 | zone->wp += sector_diff; | |
| 82 | } | |
| 83 | ||
| 84 | args->next_sector = zone->start + zone->len; | |
| 85 | return args->orig_cb(zone, args->zone_idx++, args->orig_data); | |
| 86 | } | |
| 87 | EXPORT_SYMBOL_GPL(dm_report_zones_cb); | |
| 88 | ||
| 89 | void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q) | |
| 90 | { | |
| 91 | if (!blk_queue_is_zoned(q)) | |
| 92 | return; | |
| 93 | ||
| 94 | /* | |
| 95 | * For a zoned target, the number of zones should be updated for the | |
| 96 | * correct value to be exposed in sysfs queue/nr_zones. For a BIO based | |
| 97 | * target, this is all that is needed. | |
| 98 | */ | |
| 99 | WARN_ON_ONCE(queue_is_mq(q)); | |
| 100 | q->nr_zones = blkdev_nr_zones(t->md->disk); | |
| 101 | } |