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![Christoph Hellwig](/assets/img/avatar_default.png)
The discard_alignment queue limit is named a bit misleading means the offset into the block device at which the discard granularity starts. Setting it to the discard granularity as done by dm-zoned is mostly harmless but also useless. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20220418045314.360785-6-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
1175 lines
28 KiB
C
1175 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 Western Digital Corporation or its affiliates.
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*
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* This file is released under the GPL.
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*/
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#include "dm-zoned.h"
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#include <linux/module.h>
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#define DM_MSG_PREFIX "zoned"
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#define DMZ_MIN_BIOS 8192
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/*
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* Zone BIO context.
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*/
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struct dmz_bioctx {
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struct dmz_dev *dev;
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struct dm_zone *zone;
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struct bio *bio;
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refcount_t ref;
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};
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/*
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* Chunk work descriptor.
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*/
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struct dm_chunk_work {
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struct work_struct work;
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refcount_t refcount;
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struct dmz_target *target;
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unsigned int chunk;
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struct bio_list bio_list;
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};
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/*
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* Target descriptor.
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*/
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struct dmz_target {
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struct dm_dev **ddev;
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unsigned int nr_ddevs;
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unsigned int flags;
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/* Zoned block device information */
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struct dmz_dev *dev;
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/* For metadata handling */
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struct dmz_metadata *metadata;
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/* For chunk work */
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struct radix_tree_root chunk_rxtree;
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struct workqueue_struct *chunk_wq;
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struct mutex chunk_lock;
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/* For cloned BIOs to zones */
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struct bio_set bio_set;
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/* For flush */
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spinlock_t flush_lock;
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struct bio_list flush_list;
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struct delayed_work flush_work;
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struct workqueue_struct *flush_wq;
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};
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/*
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* Flush intervals (seconds).
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*/
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#define DMZ_FLUSH_PERIOD (10 * HZ)
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/*
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* Target BIO completion.
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*/
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static inline void dmz_bio_endio(struct bio *bio, blk_status_t status)
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{
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struct dmz_bioctx *bioctx =
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dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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if (status != BLK_STS_OK && bio->bi_status == BLK_STS_OK)
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bio->bi_status = status;
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if (bioctx->dev && bio->bi_status != BLK_STS_OK)
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bioctx->dev->flags |= DMZ_CHECK_BDEV;
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if (refcount_dec_and_test(&bioctx->ref)) {
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struct dm_zone *zone = bioctx->zone;
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if (zone) {
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if (bio->bi_status != BLK_STS_OK &&
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bio_op(bio) == REQ_OP_WRITE &&
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dmz_is_seq(zone))
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set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
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dmz_deactivate_zone(zone);
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}
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bio_endio(bio);
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}
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}
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/*
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* Completion callback for an internally cloned target BIO. This terminates the
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* target BIO when there are no more references to its context.
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*/
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static void dmz_clone_endio(struct bio *clone)
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{
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struct dmz_bioctx *bioctx = clone->bi_private;
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blk_status_t status = clone->bi_status;
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bio_put(clone);
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dmz_bio_endio(bioctx->bio, status);
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}
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/*
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* Issue a clone of a target BIO. The clone may only partially process the
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* original target BIO.
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*/
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static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
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struct bio *bio, sector_t chunk_block,
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unsigned int nr_blocks)
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{
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struct dmz_bioctx *bioctx =
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dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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struct dmz_dev *dev = zone->dev;
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struct bio *clone;
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if (dev->flags & DMZ_BDEV_DYING)
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return -EIO;
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clone = bio_alloc_clone(dev->bdev, bio, GFP_NOIO, &dmz->bio_set);
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if (!clone)
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return -ENOMEM;
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bioctx->dev = dev;
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clone->bi_iter.bi_sector =
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dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
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clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT;
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clone->bi_end_io = dmz_clone_endio;
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clone->bi_private = bioctx;
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bio_advance(bio, clone->bi_iter.bi_size);
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refcount_inc(&bioctx->ref);
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submit_bio_noacct(clone);
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if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone))
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zone->wp_block += nr_blocks;
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return 0;
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}
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/*
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* Zero out pages of discarded blocks accessed by a read BIO.
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*/
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static void dmz_handle_read_zero(struct dmz_target *dmz, struct bio *bio,
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sector_t chunk_block, unsigned int nr_blocks)
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{
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unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT;
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/* Clear nr_blocks */
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swap(bio->bi_iter.bi_size, size);
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zero_fill_bio(bio);
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swap(bio->bi_iter.bi_size, size);
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bio_advance(bio, size);
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}
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/*
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* Process a read BIO.
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*/
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static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone,
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struct bio *bio)
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{
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struct dmz_metadata *zmd = dmz->metadata;
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sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio));
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unsigned int nr_blocks = dmz_bio_blocks(bio);
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sector_t end_block = chunk_block + nr_blocks;
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struct dm_zone *rzone, *bzone;
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int ret;
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/* Read into unmapped chunks need only zeroing the BIO buffer */
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if (!zone) {
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zero_fill_bio(bio);
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return 0;
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}
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DMDEBUG("(%s): READ chunk %llu -> %s zone %u, block %llu, %u blocks",
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dmz_metadata_label(zmd),
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(unsigned long long)dmz_bio_chunk(zmd, bio),
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(dmz_is_rnd(zone) ? "RND" :
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(dmz_is_cache(zone) ? "CACHE" : "SEQ")),
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zone->id,
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(unsigned long long)chunk_block, nr_blocks);
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/* Check block validity to determine the read location */
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bzone = zone->bzone;
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while (chunk_block < end_block) {
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nr_blocks = 0;
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if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
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chunk_block < zone->wp_block) {
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/* Test block validity in the data zone */
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ret = dmz_block_valid(zmd, zone, chunk_block);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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/* Read data zone blocks */
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nr_blocks = ret;
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rzone = zone;
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}
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}
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/*
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* No valid blocks found in the data zone.
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* Check the buffer zone, if there is one.
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*/
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if (!nr_blocks && bzone) {
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ret = dmz_block_valid(zmd, bzone, chunk_block);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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/* Read buffer zone blocks */
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nr_blocks = ret;
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rzone = bzone;
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}
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}
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if (nr_blocks) {
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/* Valid blocks found: read them */
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nr_blocks = min_t(unsigned int, nr_blocks,
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end_block - chunk_block);
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ret = dmz_submit_bio(dmz, rzone, bio,
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chunk_block, nr_blocks);
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if (ret)
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return ret;
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chunk_block += nr_blocks;
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} else {
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/* No valid block: zeroout the current BIO block */
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dmz_handle_read_zero(dmz, bio, chunk_block, 1);
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chunk_block++;
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}
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}
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return 0;
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}
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/*
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* Write blocks directly in a data zone, at the write pointer.
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* If a buffer zone is assigned, invalidate the blocks written
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* in place.
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*/
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static int dmz_handle_direct_write(struct dmz_target *dmz,
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struct dm_zone *zone, struct bio *bio,
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sector_t chunk_block,
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unsigned int nr_blocks)
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{
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struct dmz_metadata *zmd = dmz->metadata;
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struct dm_zone *bzone = zone->bzone;
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int ret;
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if (dmz_is_readonly(zone))
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return -EROFS;
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/* Submit write */
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ret = dmz_submit_bio(dmz, zone, bio, chunk_block, nr_blocks);
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if (ret)
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return ret;
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/*
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* Validate the blocks in the data zone and invalidate
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* in the buffer zone, if there is one.
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*/
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ret = dmz_validate_blocks(zmd, zone, chunk_block, nr_blocks);
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if (ret == 0 && bzone)
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ret = dmz_invalidate_blocks(zmd, bzone, chunk_block, nr_blocks);
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return ret;
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}
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/*
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* Write blocks in the buffer zone of @zone.
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* If no buffer zone is assigned yet, get one.
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* Called with @zone write locked.
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*/
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static int dmz_handle_buffered_write(struct dmz_target *dmz,
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struct dm_zone *zone, struct bio *bio,
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sector_t chunk_block,
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unsigned int nr_blocks)
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{
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struct dmz_metadata *zmd = dmz->metadata;
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struct dm_zone *bzone;
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int ret;
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/* Get the buffer zone. One will be allocated if needed */
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bzone = dmz_get_chunk_buffer(zmd, zone);
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if (IS_ERR(bzone))
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return PTR_ERR(bzone);
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if (dmz_is_readonly(bzone))
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return -EROFS;
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/* Submit write */
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ret = dmz_submit_bio(dmz, bzone, bio, chunk_block, nr_blocks);
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if (ret)
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return ret;
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/*
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* Validate the blocks in the buffer zone
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* and invalidate in the data zone.
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*/
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ret = dmz_validate_blocks(zmd, bzone, chunk_block, nr_blocks);
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if (ret == 0 && chunk_block < zone->wp_block)
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ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
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return ret;
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}
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/*
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* Process a write BIO.
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*/
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static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone,
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struct bio *bio)
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{
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struct dmz_metadata *zmd = dmz->metadata;
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sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio));
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unsigned int nr_blocks = dmz_bio_blocks(bio);
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if (!zone)
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return -ENOSPC;
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DMDEBUG("(%s): WRITE chunk %llu -> %s zone %u, block %llu, %u blocks",
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dmz_metadata_label(zmd),
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(unsigned long long)dmz_bio_chunk(zmd, bio),
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(dmz_is_rnd(zone) ? "RND" :
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(dmz_is_cache(zone) ? "CACHE" : "SEQ")),
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zone->id,
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(unsigned long long)chunk_block, nr_blocks);
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if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
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chunk_block == zone->wp_block) {
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/*
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* zone is a random zone or it is a sequential zone
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* and the BIO is aligned to the zone write pointer:
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* direct write the zone.
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*/
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return dmz_handle_direct_write(dmz, zone, bio,
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chunk_block, nr_blocks);
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}
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/*
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* This is an unaligned write in a sequential zone:
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* use buffered write.
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*/
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return dmz_handle_buffered_write(dmz, zone, bio, chunk_block, nr_blocks);
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}
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/*
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* Process a discard BIO.
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*/
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static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone,
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struct bio *bio)
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{
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struct dmz_metadata *zmd = dmz->metadata;
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sector_t block = dmz_bio_block(bio);
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unsigned int nr_blocks = dmz_bio_blocks(bio);
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sector_t chunk_block = dmz_chunk_block(zmd, block);
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int ret = 0;
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/* For unmapped chunks, there is nothing to do */
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if (!zone)
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return 0;
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if (dmz_is_readonly(zone))
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return -EROFS;
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DMDEBUG("(%s): DISCARD chunk %llu -> zone %u, block %llu, %u blocks",
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dmz_metadata_label(dmz->metadata),
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(unsigned long long)dmz_bio_chunk(zmd, bio),
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zone->id,
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(unsigned long long)chunk_block, nr_blocks);
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/*
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* Invalidate blocks in the data zone and its
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* buffer zone if one is mapped.
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*/
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if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
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chunk_block < zone->wp_block)
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ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
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if (ret == 0 && zone->bzone)
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ret = dmz_invalidate_blocks(zmd, zone->bzone,
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chunk_block, nr_blocks);
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return ret;
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}
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/*
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* Process a BIO.
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*/
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static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw,
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struct bio *bio)
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{
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struct dmz_bioctx *bioctx =
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dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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struct dmz_metadata *zmd = dmz->metadata;
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struct dm_zone *zone;
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int ret;
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dmz_lock_metadata(zmd);
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/*
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* Get the data zone mapping the chunk. There may be no
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* mapping for read and discard. If a mapping is obtained,
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+ the zone returned will be set to active state.
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*/
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zone = dmz_get_chunk_mapping(zmd, dmz_bio_chunk(zmd, bio),
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bio_op(bio));
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if (IS_ERR(zone)) {
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ret = PTR_ERR(zone);
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goto out;
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}
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/* Process the BIO */
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if (zone) {
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dmz_activate_zone(zone);
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bioctx->zone = zone;
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dmz_reclaim_bio_acc(zone->dev->reclaim);
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}
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switch (bio_op(bio)) {
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case REQ_OP_READ:
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ret = dmz_handle_read(dmz, zone, bio);
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break;
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case REQ_OP_WRITE:
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ret = dmz_handle_write(dmz, zone, bio);
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break;
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case REQ_OP_DISCARD:
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case REQ_OP_WRITE_ZEROES:
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ret = dmz_handle_discard(dmz, zone, bio);
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break;
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default:
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DMERR("(%s): Unsupported BIO operation 0x%x",
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dmz_metadata_label(dmz->metadata), bio_op(bio));
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ret = -EIO;
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}
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/*
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* Release the chunk mapping. This will check that the mapping
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* is still valid, that is, that the zone used still has valid blocks.
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*/
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if (zone)
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dmz_put_chunk_mapping(zmd, zone);
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out:
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dmz_bio_endio(bio, errno_to_blk_status(ret));
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dmz_unlock_metadata(zmd);
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}
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/*
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* Increment a chunk reference counter.
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*/
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static inline void dmz_get_chunk_work(struct dm_chunk_work *cw)
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{
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refcount_inc(&cw->refcount);
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}
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/*
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* Decrement a chunk work reference count and
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* free it if it becomes 0.
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*/
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static void dmz_put_chunk_work(struct dm_chunk_work *cw)
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{
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if (refcount_dec_and_test(&cw->refcount)) {
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WARN_ON(!bio_list_empty(&cw->bio_list));
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radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk);
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kfree(cw);
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}
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}
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/*
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* Chunk BIO work function.
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*/
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static void dmz_chunk_work(struct work_struct *work)
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{
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struct dm_chunk_work *cw = container_of(work, struct dm_chunk_work, work);
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struct dmz_target *dmz = cw->target;
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struct bio *bio;
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mutex_lock(&dmz->chunk_lock);
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/* Process the chunk BIOs */
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while ((bio = bio_list_pop(&cw->bio_list))) {
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mutex_unlock(&dmz->chunk_lock);
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dmz_handle_bio(dmz, cw, bio);
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mutex_lock(&dmz->chunk_lock);
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dmz_put_chunk_work(cw);
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}
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/* Queueing the work incremented the work refcount */
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dmz_put_chunk_work(cw);
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mutex_unlock(&dmz->chunk_lock);
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}
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/*
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* Flush work.
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*/
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static void dmz_flush_work(struct work_struct *work)
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{
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struct dmz_target *dmz = container_of(work, struct dmz_target, flush_work.work);
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struct bio *bio;
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int ret;
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/* Flush dirty metadata blocks */
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ret = dmz_flush_metadata(dmz->metadata);
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if (ret)
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DMDEBUG("(%s): Metadata flush failed, rc=%d",
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dmz_metadata_label(dmz->metadata), ret);
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/* Process queued flush requests */
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while (1) {
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spin_lock(&dmz->flush_lock);
|
|
bio = bio_list_pop(&dmz->flush_list);
|
|
spin_unlock(&dmz->flush_lock);
|
|
|
|
if (!bio)
|
|
break;
|
|
|
|
dmz_bio_endio(bio, errno_to_blk_status(ret));
|
|
}
|
|
|
|
queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
|
|
}
|
|
|
|
/*
|
|
* Get a chunk work and start it to process a new BIO.
|
|
* If the BIO chunk has no work yet, create one.
|
|
*/
|
|
static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
|
|
{
|
|
unsigned int chunk = dmz_bio_chunk(dmz->metadata, bio);
|
|
struct dm_chunk_work *cw;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&dmz->chunk_lock);
|
|
|
|
/* Get the BIO chunk work. If one is not active yet, create one */
|
|
cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk);
|
|
if (cw) {
|
|
dmz_get_chunk_work(cw);
|
|
} else {
|
|
/* Create a new chunk work */
|
|
cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO);
|
|
if (unlikely(!cw)) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
INIT_WORK(&cw->work, dmz_chunk_work);
|
|
refcount_set(&cw->refcount, 1);
|
|
cw->target = dmz;
|
|
cw->chunk = chunk;
|
|
bio_list_init(&cw->bio_list);
|
|
|
|
ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw);
|
|
if (unlikely(ret)) {
|
|
kfree(cw);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
bio_list_add(&cw->bio_list, bio);
|
|
|
|
if (queue_work(dmz->chunk_wq, &cw->work))
|
|
dmz_get_chunk_work(cw);
|
|
out:
|
|
mutex_unlock(&dmz->chunk_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check if the backing device is being removed. If it's on the way out,
|
|
* start failing I/O. Reclaim and metadata components also call this
|
|
* function to cleanly abort operation in the event of such failure.
|
|
*/
|
|
bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev)
|
|
{
|
|
if (dmz_dev->flags & DMZ_BDEV_DYING)
|
|
return true;
|
|
|
|
if (dmz_dev->flags & DMZ_CHECK_BDEV)
|
|
return !dmz_check_bdev(dmz_dev);
|
|
|
|
if (blk_queue_dying(bdev_get_queue(dmz_dev->bdev))) {
|
|
dmz_dev_warn(dmz_dev, "Backing device queue dying");
|
|
dmz_dev->flags |= DMZ_BDEV_DYING;
|
|
}
|
|
|
|
return dmz_dev->flags & DMZ_BDEV_DYING;
|
|
}
|
|
|
|
/*
|
|
* Check the backing device availability. This detects such events as
|
|
* backing device going offline due to errors, media removals, etc.
|
|
* This check is less efficient than dmz_bdev_is_dying() and should
|
|
* only be performed as a part of error handling.
|
|
*/
|
|
bool dmz_check_bdev(struct dmz_dev *dmz_dev)
|
|
{
|
|
struct gendisk *disk;
|
|
|
|
dmz_dev->flags &= ~DMZ_CHECK_BDEV;
|
|
|
|
if (dmz_bdev_is_dying(dmz_dev))
|
|
return false;
|
|
|
|
disk = dmz_dev->bdev->bd_disk;
|
|
if (disk->fops->check_events &&
|
|
disk->fops->check_events(disk, 0) & DISK_EVENT_MEDIA_CHANGE) {
|
|
dmz_dev_warn(dmz_dev, "Backing device offline");
|
|
dmz_dev->flags |= DMZ_BDEV_DYING;
|
|
}
|
|
|
|
return !(dmz_dev->flags & DMZ_BDEV_DYING);
|
|
}
|
|
|
|
/*
|
|
* Process a new BIO.
|
|
*/
|
|
static int dmz_map(struct dm_target *ti, struct bio *bio)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dmz_metadata *zmd = dmz->metadata;
|
|
struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
|
|
sector_t sector = bio->bi_iter.bi_sector;
|
|
unsigned int nr_sectors = bio_sectors(bio);
|
|
sector_t chunk_sector;
|
|
int ret;
|
|
|
|
if (dmz_dev_is_dying(zmd))
|
|
return DM_MAPIO_KILL;
|
|
|
|
DMDEBUG("(%s): BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks",
|
|
dmz_metadata_label(zmd),
|
|
bio_op(bio), (unsigned long long)sector, nr_sectors,
|
|
(unsigned long long)dmz_bio_chunk(zmd, bio),
|
|
(unsigned long long)dmz_chunk_block(zmd, dmz_bio_block(bio)),
|
|
(unsigned int)dmz_bio_blocks(bio));
|
|
|
|
if (!nr_sectors && bio_op(bio) != REQ_OP_WRITE)
|
|
return DM_MAPIO_REMAPPED;
|
|
|
|
/* The BIO should be block aligned */
|
|
if ((nr_sectors & DMZ_BLOCK_SECTORS_MASK) || (sector & DMZ_BLOCK_SECTORS_MASK))
|
|
return DM_MAPIO_KILL;
|
|
|
|
/* Initialize the BIO context */
|
|
bioctx->dev = NULL;
|
|
bioctx->zone = NULL;
|
|
bioctx->bio = bio;
|
|
refcount_set(&bioctx->ref, 1);
|
|
|
|
/* Set the BIO pending in the flush list */
|
|
if (!nr_sectors && bio_op(bio) == REQ_OP_WRITE) {
|
|
spin_lock(&dmz->flush_lock);
|
|
bio_list_add(&dmz->flush_list, bio);
|
|
spin_unlock(&dmz->flush_lock);
|
|
mod_delayed_work(dmz->flush_wq, &dmz->flush_work, 0);
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
/* Split zone BIOs to fit entirely into a zone */
|
|
chunk_sector = sector & (dmz_zone_nr_sectors(zmd) - 1);
|
|
if (chunk_sector + nr_sectors > dmz_zone_nr_sectors(zmd))
|
|
dm_accept_partial_bio(bio, dmz_zone_nr_sectors(zmd) - chunk_sector);
|
|
|
|
/* Now ready to handle this BIO */
|
|
ret = dmz_queue_chunk_work(dmz, bio);
|
|
if (ret) {
|
|
DMDEBUG("(%s): BIO op %d, can't process chunk %llu, err %i",
|
|
dmz_metadata_label(zmd),
|
|
bio_op(bio), (u64)dmz_bio_chunk(zmd, bio),
|
|
ret);
|
|
return DM_MAPIO_REQUEUE;
|
|
}
|
|
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
/*
|
|
* Get zoned device information.
|
|
*/
|
|
static int dmz_get_zoned_device(struct dm_target *ti, char *path,
|
|
int idx, int nr_devs)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dm_dev *ddev;
|
|
struct dmz_dev *dev;
|
|
int ret;
|
|
struct block_device *bdev;
|
|
|
|
/* Get the target device */
|
|
ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &ddev);
|
|
if (ret) {
|
|
ti->error = "Get target device failed";
|
|
return ret;
|
|
}
|
|
|
|
bdev = ddev->bdev;
|
|
if (bdev_zoned_model(bdev) == BLK_ZONED_NONE) {
|
|
if (nr_devs == 1) {
|
|
ti->error = "Invalid regular device";
|
|
goto err;
|
|
}
|
|
if (idx != 0) {
|
|
ti->error = "First device must be a regular device";
|
|
goto err;
|
|
}
|
|
if (dmz->ddev[0]) {
|
|
ti->error = "Too many regular devices";
|
|
goto err;
|
|
}
|
|
dev = &dmz->dev[idx];
|
|
dev->flags = DMZ_BDEV_REGULAR;
|
|
} else {
|
|
if (dmz->ddev[idx]) {
|
|
ti->error = "Too many zoned devices";
|
|
goto err;
|
|
}
|
|
if (nr_devs > 1 && idx == 0) {
|
|
ti->error = "First device must be a regular device";
|
|
goto err;
|
|
}
|
|
dev = &dmz->dev[idx];
|
|
}
|
|
dev->bdev = bdev;
|
|
dev->dev_idx = idx;
|
|
|
|
dev->capacity = bdev_nr_sectors(bdev);
|
|
if (ti->begin) {
|
|
ti->error = "Partial mapping is not supported";
|
|
goto err;
|
|
}
|
|
|
|
dmz->ddev[idx] = ddev;
|
|
|
|
return 0;
|
|
err:
|
|
dm_put_device(ti, ddev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Cleanup zoned device information.
|
|
*/
|
|
static void dmz_put_zoned_device(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
int i;
|
|
|
|
for (i = 0; i < dmz->nr_ddevs; i++) {
|
|
if (dmz->ddev[i]) {
|
|
dm_put_device(ti, dmz->ddev[i]);
|
|
dmz->ddev[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int dmz_fixup_devices(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dmz_dev *reg_dev, *zoned_dev;
|
|
struct request_queue *q;
|
|
sector_t zone_nr_sectors = 0;
|
|
int i;
|
|
|
|
/*
|
|
* When we have more than on devices, the first one must be a
|
|
* regular block device and the others zoned block devices.
|
|
*/
|
|
if (dmz->nr_ddevs > 1) {
|
|
reg_dev = &dmz->dev[0];
|
|
if (!(reg_dev->flags & DMZ_BDEV_REGULAR)) {
|
|
ti->error = "Primary disk is not a regular device";
|
|
return -EINVAL;
|
|
}
|
|
for (i = 1; i < dmz->nr_ddevs; i++) {
|
|
zoned_dev = &dmz->dev[i];
|
|
if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
|
|
ti->error = "Secondary disk is not a zoned device";
|
|
return -EINVAL;
|
|
}
|
|
q = bdev_get_queue(zoned_dev->bdev);
|
|
if (zone_nr_sectors &&
|
|
zone_nr_sectors != blk_queue_zone_sectors(q)) {
|
|
ti->error = "Zone nr sectors mismatch";
|
|
return -EINVAL;
|
|
}
|
|
zone_nr_sectors = blk_queue_zone_sectors(q);
|
|
zoned_dev->zone_nr_sectors = zone_nr_sectors;
|
|
zoned_dev->nr_zones =
|
|
blkdev_nr_zones(zoned_dev->bdev->bd_disk);
|
|
}
|
|
} else {
|
|
reg_dev = NULL;
|
|
zoned_dev = &dmz->dev[0];
|
|
if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
|
|
ti->error = "Disk is not a zoned device";
|
|
return -EINVAL;
|
|
}
|
|
q = bdev_get_queue(zoned_dev->bdev);
|
|
zoned_dev->zone_nr_sectors = blk_queue_zone_sectors(q);
|
|
zoned_dev->nr_zones = blkdev_nr_zones(zoned_dev->bdev->bd_disk);
|
|
}
|
|
|
|
if (reg_dev) {
|
|
sector_t zone_offset;
|
|
|
|
reg_dev->zone_nr_sectors = zone_nr_sectors;
|
|
reg_dev->nr_zones =
|
|
DIV_ROUND_UP_SECTOR_T(reg_dev->capacity,
|
|
reg_dev->zone_nr_sectors);
|
|
reg_dev->zone_offset = 0;
|
|
zone_offset = reg_dev->nr_zones;
|
|
for (i = 1; i < dmz->nr_ddevs; i++) {
|
|
dmz->dev[i].zone_offset = zone_offset;
|
|
zone_offset += dmz->dev[i].nr_zones;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Setup target.
|
|
*/
|
|
static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
|
|
{
|
|
struct dmz_target *dmz;
|
|
int ret, i;
|
|
|
|
/* Check arguments */
|
|
if (argc < 1) {
|
|
ti->error = "Invalid argument count";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Allocate and initialize the target descriptor */
|
|
dmz = kzalloc(sizeof(struct dmz_target), GFP_KERNEL);
|
|
if (!dmz) {
|
|
ti->error = "Unable to allocate the zoned target descriptor";
|
|
return -ENOMEM;
|
|
}
|
|
dmz->dev = kcalloc(argc, sizeof(struct dmz_dev), GFP_KERNEL);
|
|
if (!dmz->dev) {
|
|
ti->error = "Unable to allocate the zoned device descriptors";
|
|
kfree(dmz);
|
|
return -ENOMEM;
|
|
}
|
|
dmz->ddev = kcalloc(argc, sizeof(struct dm_dev *), GFP_KERNEL);
|
|
if (!dmz->ddev) {
|
|
ti->error = "Unable to allocate the dm device descriptors";
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
dmz->nr_ddevs = argc;
|
|
|
|
ti->private = dmz;
|
|
|
|
/* Get the target zoned block device */
|
|
for (i = 0; i < argc; i++) {
|
|
ret = dmz_get_zoned_device(ti, argv[i], i, argc);
|
|
if (ret)
|
|
goto err_dev;
|
|
}
|
|
ret = dmz_fixup_devices(ti);
|
|
if (ret)
|
|
goto err_dev;
|
|
|
|
/* Initialize metadata */
|
|
ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata,
|
|
dm_table_device_name(ti->table));
|
|
if (ret) {
|
|
ti->error = "Metadata initialization failed";
|
|
goto err_dev;
|
|
}
|
|
|
|
/* Set target (no write same support) */
|
|
ti->max_io_len = dmz_zone_nr_sectors(dmz->metadata);
|
|
ti->num_flush_bios = 1;
|
|
ti->num_discard_bios = 1;
|
|
ti->num_write_zeroes_bios = 1;
|
|
ti->per_io_data_size = sizeof(struct dmz_bioctx);
|
|
ti->flush_supported = true;
|
|
ti->discards_supported = true;
|
|
|
|
/* The exposed capacity is the number of chunks that can be mapped */
|
|
ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) <<
|
|
dmz_zone_nr_sectors_shift(dmz->metadata);
|
|
|
|
/* Zone BIO */
|
|
ret = bioset_init(&dmz->bio_set, DMZ_MIN_BIOS, 0, 0);
|
|
if (ret) {
|
|
ti->error = "Create BIO set failed";
|
|
goto err_meta;
|
|
}
|
|
|
|
/* Chunk BIO work */
|
|
mutex_init(&dmz->chunk_lock);
|
|
INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_NOIO);
|
|
dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s",
|
|
WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
|
|
dmz_metadata_label(dmz->metadata));
|
|
if (!dmz->chunk_wq) {
|
|
ti->error = "Create chunk workqueue failed";
|
|
ret = -ENOMEM;
|
|
goto err_bio;
|
|
}
|
|
|
|
/* Flush work */
|
|
spin_lock_init(&dmz->flush_lock);
|
|
bio_list_init(&dmz->flush_list);
|
|
INIT_DELAYED_WORK(&dmz->flush_work, dmz_flush_work);
|
|
dmz->flush_wq = alloc_ordered_workqueue("dmz_fwq_%s", WQ_MEM_RECLAIM,
|
|
dmz_metadata_label(dmz->metadata));
|
|
if (!dmz->flush_wq) {
|
|
ti->error = "Create flush workqueue failed";
|
|
ret = -ENOMEM;
|
|
goto err_cwq;
|
|
}
|
|
mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
|
|
|
|
/* Initialize reclaim */
|
|
for (i = 0; i < dmz->nr_ddevs; i++) {
|
|
ret = dmz_ctr_reclaim(dmz->metadata, &dmz->dev[i].reclaim, i);
|
|
if (ret) {
|
|
ti->error = "Zone reclaim initialization failed";
|
|
goto err_fwq;
|
|
}
|
|
}
|
|
|
|
DMINFO("(%s): Target device: %llu 512-byte logical sectors (%llu blocks)",
|
|
dmz_metadata_label(dmz->metadata),
|
|
(unsigned long long)ti->len,
|
|
(unsigned long long)dmz_sect2blk(ti->len));
|
|
|
|
return 0;
|
|
err_fwq:
|
|
destroy_workqueue(dmz->flush_wq);
|
|
err_cwq:
|
|
destroy_workqueue(dmz->chunk_wq);
|
|
err_bio:
|
|
mutex_destroy(&dmz->chunk_lock);
|
|
bioset_exit(&dmz->bio_set);
|
|
err_meta:
|
|
dmz_dtr_metadata(dmz->metadata);
|
|
err_dev:
|
|
dmz_put_zoned_device(ti);
|
|
err:
|
|
kfree(dmz->dev);
|
|
kfree(dmz);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Cleanup target.
|
|
*/
|
|
static void dmz_dtr(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
int i;
|
|
|
|
destroy_workqueue(dmz->chunk_wq);
|
|
|
|
for (i = 0; i < dmz->nr_ddevs; i++)
|
|
dmz_dtr_reclaim(dmz->dev[i].reclaim);
|
|
|
|
cancel_delayed_work_sync(&dmz->flush_work);
|
|
destroy_workqueue(dmz->flush_wq);
|
|
|
|
(void) dmz_flush_metadata(dmz->metadata);
|
|
|
|
dmz_dtr_metadata(dmz->metadata);
|
|
|
|
bioset_exit(&dmz->bio_set);
|
|
|
|
dmz_put_zoned_device(ti);
|
|
|
|
mutex_destroy(&dmz->chunk_lock);
|
|
|
|
kfree(dmz->dev);
|
|
kfree(dmz);
|
|
}
|
|
|
|
/*
|
|
* Setup target request queue limits.
|
|
*/
|
|
static void dmz_io_hints(struct dm_target *ti, struct queue_limits *limits)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
unsigned int chunk_sectors = dmz_zone_nr_sectors(dmz->metadata);
|
|
|
|
limits->logical_block_size = DMZ_BLOCK_SIZE;
|
|
limits->physical_block_size = DMZ_BLOCK_SIZE;
|
|
|
|
blk_limits_io_min(limits, DMZ_BLOCK_SIZE);
|
|
blk_limits_io_opt(limits, DMZ_BLOCK_SIZE);
|
|
|
|
limits->discard_alignment = 0;
|
|
limits->discard_granularity = DMZ_BLOCK_SIZE;
|
|
limits->max_discard_sectors = chunk_sectors;
|
|
limits->max_hw_discard_sectors = chunk_sectors;
|
|
limits->max_write_zeroes_sectors = chunk_sectors;
|
|
|
|
/* FS hint to try to align to the device zone size */
|
|
limits->chunk_sectors = chunk_sectors;
|
|
limits->max_sectors = chunk_sectors;
|
|
|
|
/* We are exposing a drive-managed zoned block device */
|
|
limits->zoned = BLK_ZONED_NONE;
|
|
}
|
|
|
|
/*
|
|
* Pass on ioctl to the backend device.
|
|
*/
|
|
static int dmz_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dmz_dev *dev = &dmz->dev[0];
|
|
|
|
if (!dmz_check_bdev(dev))
|
|
return -EIO;
|
|
|
|
*bdev = dev->bdev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Stop works on suspend.
|
|
*/
|
|
static void dmz_suspend(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
int i;
|
|
|
|
flush_workqueue(dmz->chunk_wq);
|
|
for (i = 0; i < dmz->nr_ddevs; i++)
|
|
dmz_suspend_reclaim(dmz->dev[i].reclaim);
|
|
cancel_delayed_work_sync(&dmz->flush_work);
|
|
}
|
|
|
|
/*
|
|
* Restart works on resume or if suspend failed.
|
|
*/
|
|
static void dmz_resume(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
int i;
|
|
|
|
queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
|
|
for (i = 0; i < dmz->nr_ddevs; i++)
|
|
dmz_resume_reclaim(dmz->dev[i].reclaim);
|
|
}
|
|
|
|
static int dmz_iterate_devices(struct dm_target *ti,
|
|
iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
|
|
sector_t capacity;
|
|
int i, r;
|
|
|
|
for (i = 0; i < dmz->nr_ddevs; i++) {
|
|
capacity = dmz->dev[i].capacity & ~(zone_nr_sectors - 1);
|
|
r = fn(ti, dmz->ddev[i], 0, capacity, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static void dmz_status(struct dm_target *ti, status_type_t type,
|
|
unsigned int status_flags, char *result,
|
|
unsigned int maxlen)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
ssize_t sz = 0;
|
|
char buf[BDEVNAME_SIZE];
|
|
struct dmz_dev *dev;
|
|
int i;
|
|
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
DMEMIT("%u zones %u/%u cache",
|
|
dmz_nr_zones(dmz->metadata),
|
|
dmz_nr_unmap_cache_zones(dmz->metadata),
|
|
dmz_nr_cache_zones(dmz->metadata));
|
|
for (i = 0; i < dmz->nr_ddevs; i++) {
|
|
/*
|
|
* For a multi-device setup the first device
|
|
* contains only cache zones.
|
|
*/
|
|
if ((i == 0) &&
|
|
(dmz_nr_cache_zones(dmz->metadata) > 0))
|
|
continue;
|
|
DMEMIT(" %u/%u random %u/%u sequential",
|
|
dmz_nr_unmap_rnd_zones(dmz->metadata, i),
|
|
dmz_nr_rnd_zones(dmz->metadata, i),
|
|
dmz_nr_unmap_seq_zones(dmz->metadata, i),
|
|
dmz_nr_seq_zones(dmz->metadata, i));
|
|
}
|
|
break;
|
|
case STATUSTYPE_TABLE:
|
|
dev = &dmz->dev[0];
|
|
format_dev_t(buf, dev->bdev->bd_dev);
|
|
DMEMIT("%s", buf);
|
|
for (i = 1; i < dmz->nr_ddevs; i++) {
|
|
dev = &dmz->dev[i];
|
|
format_dev_t(buf, dev->bdev->bd_dev);
|
|
DMEMIT(" %s", buf);
|
|
}
|
|
break;
|
|
case STATUSTYPE_IMA:
|
|
*result = '\0';
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,
|
|
char *result, unsigned int maxlen)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
int r = -EINVAL;
|
|
|
|
if (!strcasecmp(argv[0], "reclaim")) {
|
|
int i;
|
|
|
|
for (i = 0; i < dmz->nr_ddevs; i++)
|
|
dmz_schedule_reclaim(dmz->dev[i].reclaim);
|
|
r = 0;
|
|
} else
|
|
DMERR("unrecognized message %s", argv[0]);
|
|
return r;
|
|
}
|
|
|
|
static struct target_type dmz_type = {
|
|
.name = "zoned",
|
|
.version = {2, 0, 0},
|
|
.features = DM_TARGET_SINGLETON | DM_TARGET_MIXED_ZONED_MODEL,
|
|
.module = THIS_MODULE,
|
|
.ctr = dmz_ctr,
|
|
.dtr = dmz_dtr,
|
|
.map = dmz_map,
|
|
.io_hints = dmz_io_hints,
|
|
.prepare_ioctl = dmz_prepare_ioctl,
|
|
.postsuspend = dmz_suspend,
|
|
.resume = dmz_resume,
|
|
.iterate_devices = dmz_iterate_devices,
|
|
.status = dmz_status,
|
|
.message = dmz_message,
|
|
};
|
|
|
|
static int __init dmz_init(void)
|
|
{
|
|
return dm_register_target(&dmz_type);
|
|
}
|
|
|
|
static void __exit dmz_exit(void)
|
|
{
|
|
dm_unregister_target(&dmz_type);
|
|
}
|
|
|
|
module_init(dmz_init);
|
|
module_exit(dmz_exit);
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " target for zoned block devices");
|
|
MODULE_AUTHOR("Damien Le Moal <damien.lemoal@wdc.com>");
|
|
MODULE_LICENSE("GPL");
|