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73d7b06e90
Commit0fbb4d93b3
("dm: add dm_submit_bio_remap interface") changed the alloc_io() function to delay the initialization of struct dm_io's orig_bio member, leaving it NULL until after the dm_io and associated user submitted bio is processed by __split_and_process_bio(). This change causes a NULL pointer dereference in dm_zone_map_bio() when the original user bio is inspected to detect the need for zone append command emulation. Fix this NULL pointer by updating dm_zone_map_bio() to not access ->orig_bio when the same info can be accessed from the clone of the ->orig_bio _before_ any ->map processing. Save off the bio_op() and bio_sectors() for the clone and then use the saved orig_bio_details as needed. Fixes:0fbb4d93b3
("dm: add dm_submit_bio_remap interface") Reported-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
664 lines
17 KiB
C
664 lines
17 KiB
C
// 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 <linux/mm.h>
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#include <linux/sched/mm.h>
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#include <linux/slab.h>
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#include "dm-core.h"
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#define DM_MSG_PREFIX "zone"
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#define DM_ZONE_INVALID_WP_OFST UINT_MAX
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/*
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* For internal zone reports bypassing the top BIO submission path.
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*/
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static int dm_blk_do_report_zones(struct mapped_device *md, struct dm_table *t,
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sector_t sector, unsigned int nr_zones,
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report_zones_cb cb, void *data)
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{
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struct gendisk *disk = md->disk;
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int 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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do {
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struct dm_target *tgt;
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tgt = dm_table_find_target(t, args.next_sector);
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if (WARN_ON_ONCE(!tgt->type->report_zones))
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return -EIO;
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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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return ret;
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} while (args.zone_idx < nr_zones &&
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args.next_sector < get_capacity(disk));
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return args.zone_idx;
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}
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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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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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return -EIO;
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ret = dm_blk_do_report_zones(md, map, sector, nr_zones, cb, data);
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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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static int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx,
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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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/*
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* Helper for drivers of zoned targets to implement struct target_type
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* report_zones operation.
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*/
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int dm_report_zones(struct block_device *bdev, sector_t start, sector_t sector,
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struct dm_report_zones_args *args, unsigned int nr_zones)
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{
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/*
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* Set the target mapping start sector first so that
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* dm_report_zones_cb() can correctly remap zone information.
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*/
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args->start = start;
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return blkdev_report_zones(bdev, sector, nr_zones,
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dm_report_zones_cb, args);
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}
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EXPORT_SYMBOL_GPL(dm_report_zones);
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bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
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{
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struct request_queue *q = md->queue;
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if (!blk_queue_is_zoned(q))
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return false;
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switch (bio_op(bio)) {
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE:
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return !op_is_flush(bio->bi_opf) && bio_sectors(bio);
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default:
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return false;
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}
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}
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void dm_cleanup_zoned_dev(struct mapped_device *md)
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{
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struct request_queue *q = md->queue;
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if (q) {
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kfree(q->conv_zones_bitmap);
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q->conv_zones_bitmap = NULL;
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kfree(q->seq_zones_wlock);
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q->seq_zones_wlock = NULL;
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}
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kvfree(md->zwp_offset);
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md->zwp_offset = NULL;
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md->nr_zones = 0;
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}
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static unsigned int dm_get_zone_wp_offset(struct blk_zone *zone)
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{
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switch (zone->cond) {
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case BLK_ZONE_COND_IMP_OPEN:
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case BLK_ZONE_COND_EXP_OPEN:
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case BLK_ZONE_COND_CLOSED:
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return zone->wp - zone->start;
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case BLK_ZONE_COND_FULL:
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return zone->len;
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case BLK_ZONE_COND_EMPTY:
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case BLK_ZONE_COND_NOT_WP:
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case BLK_ZONE_COND_OFFLINE:
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case BLK_ZONE_COND_READONLY:
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default:
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/*
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* Conventional, offline and read-only zones do not have a valid
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* write pointer. Use 0 as for an empty zone.
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*/
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return 0;
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}
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}
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static int dm_zone_revalidate_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct mapped_device *md = data;
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struct request_queue *q = md->queue;
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switch (zone->type) {
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case BLK_ZONE_TYPE_CONVENTIONAL:
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if (!q->conv_zones_bitmap) {
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q->conv_zones_bitmap =
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kcalloc(BITS_TO_LONGS(q->nr_zones),
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sizeof(unsigned long), GFP_NOIO);
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if (!q->conv_zones_bitmap)
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return -ENOMEM;
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}
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set_bit(idx, q->conv_zones_bitmap);
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break;
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case BLK_ZONE_TYPE_SEQWRITE_REQ:
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case BLK_ZONE_TYPE_SEQWRITE_PREF:
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if (!q->seq_zones_wlock) {
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q->seq_zones_wlock =
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kcalloc(BITS_TO_LONGS(q->nr_zones),
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sizeof(unsigned long), GFP_NOIO);
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if (!q->seq_zones_wlock)
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return -ENOMEM;
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}
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if (!md->zwp_offset) {
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md->zwp_offset =
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kvcalloc(q->nr_zones, sizeof(unsigned int),
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GFP_KERNEL);
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if (!md->zwp_offset)
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return -ENOMEM;
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}
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md->zwp_offset[idx] = dm_get_zone_wp_offset(zone);
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break;
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default:
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DMERR("Invalid zone type 0x%x at sectors %llu",
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(int)zone->type, zone->start);
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return -ENODEV;
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}
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return 0;
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}
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/*
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* Revalidate the zones of a mapped device to initialize resource necessary
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* for zone append emulation. Note that we cannot simply use the block layer
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* blk_revalidate_disk_zones() function here as the mapped device is suspended
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* (this is called from __bind() context).
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*/
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static int dm_revalidate_zones(struct mapped_device *md, struct dm_table *t)
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{
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struct request_queue *q = md->queue;
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unsigned int noio_flag;
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int ret;
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/*
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* Check if something changed. If yes, cleanup the current resources
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* and reallocate everything.
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*/
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if (!q->nr_zones || q->nr_zones != md->nr_zones)
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dm_cleanup_zoned_dev(md);
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if (md->nr_zones)
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return 0;
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/*
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* Scan all zones to initialize everything. Ensure that all vmalloc
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* operations in this context are done as if GFP_NOIO was specified.
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*/
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noio_flag = memalloc_noio_save();
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ret = dm_blk_do_report_zones(md, t, 0, q->nr_zones,
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dm_zone_revalidate_cb, md);
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memalloc_noio_restore(noio_flag);
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if (ret < 0)
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goto err;
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if (ret != q->nr_zones) {
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ret = -EIO;
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goto err;
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}
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md->nr_zones = q->nr_zones;
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return 0;
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err:
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DMERR("Revalidate zones failed %d", ret);
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dm_cleanup_zoned_dev(md);
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return ret;
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}
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static int device_not_zone_append_capable(struct dm_target *ti,
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struct dm_dev *dev, sector_t start,
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sector_t len, void *data)
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{
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return !blk_queue_is_zoned(bdev_get_queue(dev->bdev));
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}
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static bool dm_table_supports_zone_append(struct dm_table *t)
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{
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struct dm_target *ti;
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unsigned int i;
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for (i = 0; i < dm_table_get_num_targets(t); i++) {
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ti = dm_table_get_target(t, i);
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if (ti->emulate_zone_append)
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return false;
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if (!ti->type->iterate_devices ||
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ti->type->iterate_devices(ti, device_not_zone_append_capable, NULL))
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return false;
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}
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return true;
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}
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int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q)
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{
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struct mapped_device *md = t->md;
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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.
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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(md->disk);
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/* Check if zone append is natively supported */
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if (dm_table_supports_zone_append(t)) {
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clear_bit(DMF_EMULATE_ZONE_APPEND, &md->flags);
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dm_cleanup_zoned_dev(md);
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return 0;
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}
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/*
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* Mark the mapped device as needing zone append emulation and
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* initialize the emulation resources once the capacity is set.
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*/
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set_bit(DMF_EMULATE_ZONE_APPEND, &md->flags);
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if (!get_capacity(md->disk))
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return 0;
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return dm_revalidate_zones(md, t);
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}
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static int dm_update_zone_wp_offset_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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unsigned int *wp_offset = data;
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*wp_offset = dm_get_zone_wp_offset(zone);
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return 0;
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}
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static int dm_update_zone_wp_offset(struct mapped_device *md, unsigned int zno,
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unsigned int *wp_ofst)
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{
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sector_t sector = zno * blk_queue_zone_sectors(md->queue);
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unsigned int noio_flag;
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struct dm_table *t;
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int srcu_idx, ret;
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t = dm_get_live_table(md, &srcu_idx);
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if (!t)
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return -EIO;
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/*
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* Ensure that all memory allocations in this context are done as if
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* GFP_NOIO was specified.
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*/
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noio_flag = memalloc_noio_save();
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ret = dm_blk_do_report_zones(md, t, sector, 1,
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dm_update_zone_wp_offset_cb, wp_ofst);
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memalloc_noio_restore(noio_flag);
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dm_put_live_table(md, srcu_idx);
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if (ret != 1)
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return -EIO;
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return 0;
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}
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struct orig_bio_details {
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unsigned int op;
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unsigned int nr_sectors;
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};
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/*
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* First phase of BIO mapping for targets with zone append emulation:
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* check all BIO that change a zone writer pointer and change zone
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* append operations into regular write operations.
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*/
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static bool dm_zone_map_bio_begin(struct mapped_device *md,
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unsigned int zno, struct bio *clone)
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{
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sector_t zsectors = blk_queue_zone_sectors(md->queue);
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unsigned int zwp_offset = READ_ONCE(md->zwp_offset[zno]);
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/*
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* If the target zone is in an error state, recover by inspecting the
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* zone to get its current write pointer position. Note that since the
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* target zone is already locked, a BIO issuing context should never
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* see the zone write in the DM_ZONE_UPDATING_WP_OFST state.
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*/
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if (zwp_offset == DM_ZONE_INVALID_WP_OFST) {
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if (dm_update_zone_wp_offset(md, zno, &zwp_offset))
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return false;
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WRITE_ONCE(md->zwp_offset[zno], zwp_offset);
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}
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switch (bio_op(clone)) {
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case REQ_OP_ZONE_RESET:
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case REQ_OP_ZONE_FINISH:
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return true;
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE:
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/* Writes must be aligned to the zone write pointer */
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if ((clone->bi_iter.bi_sector & (zsectors - 1)) != zwp_offset)
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return false;
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break;
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case REQ_OP_ZONE_APPEND:
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/*
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* Change zone append operations into a non-mergeable regular
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* writes directed at the current write pointer position of the
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* target zone.
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*/
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clone->bi_opf = REQ_OP_WRITE | REQ_NOMERGE |
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(clone->bi_opf & (~REQ_OP_MASK));
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clone->bi_iter.bi_sector += zwp_offset;
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break;
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default:
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DMWARN_LIMIT("Invalid BIO operation");
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return false;
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}
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/* Cannot write to a full zone */
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if (zwp_offset >= zsectors)
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return false;
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return true;
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}
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/*
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* Second phase of BIO mapping for targets with zone append emulation:
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* update the zone write pointer offset array to account for the additional
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* data written to a zone. Note that at this point, the remapped clone BIO
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* may already have completed, so we do not touch it.
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*/
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static blk_status_t dm_zone_map_bio_end(struct mapped_device *md, unsigned int zno,
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struct orig_bio_details *orig_bio_details,
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unsigned int nr_sectors)
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{
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unsigned int zwp_offset = READ_ONCE(md->zwp_offset[zno]);
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/* The clone BIO may already have been completed and failed */
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if (zwp_offset == DM_ZONE_INVALID_WP_OFST)
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return BLK_STS_IOERR;
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/* Update the zone wp offset */
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switch (orig_bio_details->op) {
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case REQ_OP_ZONE_RESET:
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WRITE_ONCE(md->zwp_offset[zno], 0);
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return BLK_STS_OK;
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case REQ_OP_ZONE_FINISH:
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WRITE_ONCE(md->zwp_offset[zno],
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blk_queue_zone_sectors(md->queue));
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return BLK_STS_OK;
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE:
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WRITE_ONCE(md->zwp_offset[zno], zwp_offset + nr_sectors);
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return BLK_STS_OK;
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case REQ_OP_ZONE_APPEND:
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/*
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* Check that the target did not truncate the write operation
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* emulating a zone append.
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*/
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if (nr_sectors != orig_bio_details->nr_sectors) {
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DMWARN_LIMIT("Truncated write for zone append");
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return BLK_STS_IOERR;
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}
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WRITE_ONCE(md->zwp_offset[zno], zwp_offset + nr_sectors);
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return BLK_STS_OK;
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default:
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DMWARN_LIMIT("Invalid BIO operation");
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return BLK_STS_IOERR;
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}
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}
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static inline void dm_zone_lock(struct request_queue *q,
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unsigned int zno, struct bio *clone)
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{
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if (WARN_ON_ONCE(bio_flagged(clone, BIO_ZONE_WRITE_LOCKED)))
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return;
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wait_on_bit_lock_io(q->seq_zones_wlock, zno, TASK_UNINTERRUPTIBLE);
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bio_set_flag(clone, BIO_ZONE_WRITE_LOCKED);
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}
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static inline void dm_zone_unlock(struct request_queue *q,
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unsigned int zno, struct bio *clone)
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{
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if (!bio_flagged(clone, BIO_ZONE_WRITE_LOCKED))
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return;
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WARN_ON_ONCE(!test_bit(zno, q->seq_zones_wlock));
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clear_bit_unlock(zno, q->seq_zones_wlock);
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smp_mb__after_atomic();
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wake_up_bit(q->seq_zones_wlock, zno);
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bio_clear_flag(clone, BIO_ZONE_WRITE_LOCKED);
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}
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|
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static bool dm_need_zone_wp_tracking(struct bio *bio)
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|
{
|
|
/*
|
|
* Special processing is not needed for operations that do not need the
|
|
* zone write lock, that is, all operations that target conventional
|
|
* zones and all operations that do not modify directly a sequential
|
|
* zone write pointer.
|
|
*/
|
|
if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
|
|
return false;
|
|
switch (bio_op(bio)) {
|
|
case REQ_OP_WRITE_ZEROES:
|
|
case REQ_OP_WRITE:
|
|
case REQ_OP_ZONE_RESET:
|
|
case REQ_OP_ZONE_FINISH:
|
|
case REQ_OP_ZONE_APPEND:
|
|
return bio_zone_is_seq(bio);
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Special IO mapping for targets needing zone append emulation.
|
|
*/
|
|
int dm_zone_map_bio(struct dm_target_io *tio)
|
|
{
|
|
struct dm_io *io = tio->io;
|
|
struct dm_target *ti = tio->ti;
|
|
struct mapped_device *md = io->md;
|
|
struct request_queue *q = md->queue;
|
|
struct bio *clone = &tio->clone;
|
|
struct orig_bio_details orig_bio_details;
|
|
unsigned int zno;
|
|
blk_status_t sts;
|
|
int r;
|
|
|
|
/*
|
|
* IOs that do not change a zone write pointer do not need
|
|
* any additional special processing.
|
|
*/
|
|
if (!dm_need_zone_wp_tracking(clone))
|
|
return ti->type->map(ti, clone);
|
|
|
|
/* Lock the target zone */
|
|
zno = bio_zone_no(clone);
|
|
dm_zone_lock(q, zno, clone);
|
|
|
|
orig_bio_details.nr_sectors = bio_sectors(clone);
|
|
orig_bio_details.op = bio_op(clone);
|
|
|
|
/*
|
|
* Check that the bio and the target zone write pointer offset are
|
|
* both valid, and if the bio is a zone append, remap it to a write.
|
|
*/
|
|
if (!dm_zone_map_bio_begin(md, zno, clone)) {
|
|
dm_zone_unlock(q, zno, clone);
|
|
return DM_MAPIO_KILL;
|
|
}
|
|
|
|
/*
|
|
* The target map function may issue and complete the IO quickly.
|
|
* Take an extra reference on the IO to make sure it does disappear
|
|
* until we run dm_zone_map_bio_end().
|
|
*/
|
|
dm_io_inc_pending(io);
|
|
|
|
/* Let the target do its work */
|
|
r = ti->type->map(ti, clone);
|
|
switch (r) {
|
|
case DM_MAPIO_SUBMITTED:
|
|
/*
|
|
* The target submitted the clone BIO. The target zone will
|
|
* be unlocked on completion of the clone.
|
|
*/
|
|
sts = dm_zone_map_bio_end(md, zno, &orig_bio_details,
|
|
*tio->len_ptr);
|
|
break;
|
|
case DM_MAPIO_REMAPPED:
|
|
/*
|
|
* The target only remapped the clone BIO. In case of error,
|
|
* unlock the target zone here as the clone will not be
|
|
* submitted.
|
|
*/
|
|
sts = dm_zone_map_bio_end(md, zno, &orig_bio_details,
|
|
*tio->len_ptr);
|
|
if (sts != BLK_STS_OK)
|
|
dm_zone_unlock(q, zno, clone);
|
|
break;
|
|
case DM_MAPIO_REQUEUE:
|
|
case DM_MAPIO_KILL:
|
|
default:
|
|
dm_zone_unlock(q, zno, clone);
|
|
sts = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
|
|
/* Drop the extra reference on the IO */
|
|
dm_io_dec_pending(io, sts);
|
|
|
|
if (sts != BLK_STS_OK)
|
|
return DM_MAPIO_KILL;
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* IO completion callback called from clone_endio().
|
|
*/
|
|
void dm_zone_endio(struct dm_io *io, struct bio *clone)
|
|
{
|
|
struct mapped_device *md = io->md;
|
|
struct request_queue *q = md->queue;
|
|
struct bio *orig_bio = io->orig_bio;
|
|
unsigned int zwp_offset;
|
|
unsigned int zno;
|
|
|
|
/*
|
|
* For targets that do not emulate zone append, we only need to
|
|
* handle native zone-append bios.
|
|
*/
|
|
if (!dm_emulate_zone_append(md)) {
|
|
/*
|
|
* Get the offset within the zone of the written sector
|
|
* and add that to the original bio sector position.
|
|
*/
|
|
if (clone->bi_status == BLK_STS_OK &&
|
|
bio_op(clone) == REQ_OP_ZONE_APPEND) {
|
|
sector_t mask = (sector_t)blk_queue_zone_sectors(q) - 1;
|
|
|
|
orig_bio->bi_iter.bi_sector +=
|
|
clone->bi_iter.bi_sector & mask;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For targets that do emulate zone append, if the clone BIO does not
|
|
* own the target zone write lock, we have nothing to do.
|
|
*/
|
|
if (!bio_flagged(clone, BIO_ZONE_WRITE_LOCKED))
|
|
return;
|
|
|
|
zno = bio_zone_no(orig_bio);
|
|
|
|
if (clone->bi_status != BLK_STS_OK) {
|
|
/*
|
|
* BIOs that modify a zone write pointer may leave the zone
|
|
* in an unknown state in case of failure (e.g. the write
|
|
* pointer was only partially advanced). In this case, set
|
|
* the target zone write pointer as invalid unless it is
|
|
* already being updated.
|
|
*/
|
|
WRITE_ONCE(md->zwp_offset[zno], DM_ZONE_INVALID_WP_OFST);
|
|
} else if (bio_op(orig_bio) == REQ_OP_ZONE_APPEND) {
|
|
/*
|
|
* Get the written sector for zone append operation that were
|
|
* emulated using regular write operations.
|
|
*/
|
|
zwp_offset = READ_ONCE(md->zwp_offset[zno]);
|
|
if (WARN_ON_ONCE(zwp_offset < bio_sectors(orig_bio)))
|
|
WRITE_ONCE(md->zwp_offset[zno],
|
|
DM_ZONE_INVALID_WP_OFST);
|
|
else
|
|
orig_bio->bi_iter.bi_sector +=
|
|
zwp_offset - bio_sectors(orig_bio);
|
|
}
|
|
|
|
dm_zone_unlock(q, zno, clone);
|
|
}
|