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![Damien Le Moal](/assets/img/avatar_default.png)
The SCSI layer allows ZBC drives to have a smaller last runt zone. For such a device, specifying the entire capacity for a dm-zoned target table entry fails because the specified capacity is not aligned on a device zone size indicated in the request queue structure of the device. Fix this problem by ignoring the last runt zone in the entry length when seting up the dm-zoned target (ctr method) and when iterating table entries of the target (iterate_devices method). This allows dm-zoned users to still easily setup a target using the entire device capacity (as mandated by dm-zoned) or the aligned capacity excluding the last runt zone. While at it, replace direct references to the device queue chunk_sectors limit with calls to the accessor blk_queue_zone_sectors(). Reported-by: Peter Desnoyers <pjd@ccs.neu.edu> Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
972 lines
23 KiB
C
972 lines
23 KiB
C
/*
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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_target *target;
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struct dm_zone *zone;
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struct bio *bio;
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atomic_t ref;
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blk_status_t status;
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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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atomic_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 long 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 reclaim */
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struct dmz_reclaim *reclaim;
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/* For chunk work */
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struct mutex chunk_lock;
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struct radix_tree_root chunk_rxtree;
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struct workqueue_struct *chunk_wq;
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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 = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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if (bioctx->status == BLK_STS_OK && status != BLK_STS_OK)
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bioctx->status = status;
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bio_endio(bio);
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}
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/*
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* Partial clone read BIO completion callback. 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_read_bio_end_io(struct bio *bio)
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{
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struct dmz_bioctx *bioctx = bio->bi_private;
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blk_status_t status = bio->bi_status;
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bio_put(bio);
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dmz_bio_endio(bioctx->bio, status);
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}
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/*
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* Issue a BIO to a zone. The BIO may only partially process the
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* original target BIO.
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*/
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static int dmz_submit_read_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 = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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sector_t sector;
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struct bio *clone;
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/* BIO remap sector */
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sector = dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
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/* If the read is not partial, there is no need to clone the BIO */
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if (nr_blocks == dmz_bio_blocks(bio)) {
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/* Setup and submit the BIO */
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bio->bi_iter.bi_sector = sector;
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atomic_inc(&bioctx->ref);
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generic_make_request(bio);
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return 0;
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}
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/* Partial BIO: we need to clone the BIO */
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clone = bio_clone_fast(bio, GFP_NOIO, dmz->bio_set);
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if (!clone)
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return -ENOMEM;
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/* Setup the clone */
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clone->bi_iter.bi_sector = sector;
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clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT;
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clone->bi_end_io = dmz_read_bio_end_io;
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clone->bi_private = bioctx;
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bio_advance(bio, clone->bi_iter.bi_size);
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/* Submit the clone */
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atomic_inc(&bioctx->ref);
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generic_make_request(clone);
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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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sector_t chunk_block = dmz_chunk_block(dmz->dev, 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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dmz_dev_debug(dmz->dev, "READ chunk %llu -> %s zone %u, block %llu, %u blocks",
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(unsigned long long)dmz_bio_chunk(dmz->dev, bio),
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(dmz_is_rnd(zone) ? "RND" : "SEQ"),
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dmz_id(dmz->metadata, zone),
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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) || chunk_block < zone->wp_block) {
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/* Test block validity in the data zone */
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ret = dmz_block_valid(dmz->metadata, 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(dmz->metadata, 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, end_block - chunk_block);
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ret = dmz_submit_read_bio(dmz, rzone, bio, 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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* Issue a write BIO to a zone.
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*/
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static void dmz_submit_write_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 = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
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/* Setup and submit the BIO */
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bio_set_dev(bio, dmz->dev->bdev);
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bio->bi_iter.bi_sector = dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
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atomic_inc(&bioctx->ref);
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generic_make_request(bio);
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if (dmz_is_seq(zone))
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zone->wp_block += nr_blocks;
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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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dmz_submit_write_bio(dmz, zone, bio, chunk_block, nr_blocks);
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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 (!bzone)
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return -ENOSPC;
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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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dmz_submit_write_bio(dmz, bzone, bio, chunk_block, nr_blocks);
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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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sector_t chunk_block = dmz_chunk_block(dmz->dev, 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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dmz_dev_debug(dmz->dev, "WRITE chunk %llu -> %s zone %u, block %llu, %u blocks",
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(unsigned long long)dmz_bio_chunk(dmz->dev, bio),
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(dmz_is_rnd(zone) ? "RND" : "SEQ"),
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dmz_id(dmz->metadata, zone),
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(unsigned long long)chunk_block, nr_blocks);
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if (dmz_is_rnd(zone) || 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, 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(dmz->dev, 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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dmz_dev_debug(dmz->dev, "DISCARD chunk %llu -> zone %u, block %llu, %u blocks",
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(unsigned long long)dmz_bio_chunk(dmz->dev, bio),
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dmz_id(zmd, zone),
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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) || 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 = 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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/*
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* Write may trigger a zone allocation. So make sure the
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* allocation can succeed.
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*/
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if (bio_op(bio) == REQ_OP_WRITE)
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dmz_schedule_reclaim(dmz->reclaim);
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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(dmz->dev, 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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}
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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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dmz_dev_err(dmz->dev, "Unsupported BIO operation 0x%x",
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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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atomic_inc(&cw->refcount);
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}
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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 (atomic_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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/*
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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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|
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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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/*
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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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|
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/* Flush dirty metadata blocks */
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ret = dmz_flush_metadata(dmz->metadata);
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|
|
/* Process queued flush requests */
|
|
while (1) {
|
|
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 void dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
|
|
{
|
|
unsigned int chunk = dmz_bio_chunk(dmz->dev, bio);
|
|
struct dm_chunk_work *cw;
|
|
|
|
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) {
|
|
int ret;
|
|
|
|
/* Create a new chunk work */
|
|
cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO);
|
|
if (!cw)
|
|
goto out;
|
|
|
|
INIT_WORK(&cw->work, dmz_chunk_work);
|
|
atomic_set(&cw->refcount, 0);
|
|
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);
|
|
cw = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
bio_list_add(&cw->bio_list, bio);
|
|
dmz_get_chunk_work(cw);
|
|
|
|
if (queue_work(dmz->chunk_wq, &cw->work))
|
|
dmz_get_chunk_work(cw);
|
|
out:
|
|
mutex_unlock(&dmz->chunk_lock);
|
|
}
|
|
|
|
/*
|
|
* Process a new BIO.
|
|
*/
|
|
static int dmz_map(struct dm_target *ti, struct bio *bio)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dmz_dev *dev = dmz->dev;
|
|
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;
|
|
|
|
dmz_dev_debug(dev, "BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks",
|
|
bio_op(bio), (unsigned long long)sector, nr_sectors,
|
|
(unsigned long long)dmz_bio_chunk(dmz->dev, bio),
|
|
(unsigned long long)dmz_chunk_block(dmz->dev, dmz_bio_block(bio)),
|
|
(unsigned int)dmz_bio_blocks(bio));
|
|
|
|
bio_set_dev(bio, dev->bdev);
|
|
|
|
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->target = dmz;
|
|
bioctx->zone = NULL;
|
|
bioctx->bio = bio;
|
|
atomic_set(&bioctx->ref, 1);
|
|
bioctx->status = BLK_STS_OK;
|
|
|
|
/* 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 & (dev->zone_nr_sectors - 1);
|
|
if (chunk_sector + nr_sectors > dev->zone_nr_sectors)
|
|
dm_accept_partial_bio(bio, dev->zone_nr_sectors - chunk_sector);
|
|
|
|
/* Now ready to handle this BIO */
|
|
dmz_reclaim_bio_acc(dmz->reclaim);
|
|
dmz_queue_chunk_work(dmz, bio);
|
|
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
/*
|
|
* Completed target BIO processing.
|
|
*/
|
|
static int dmz_end_io(struct dm_target *ti, struct bio *bio, blk_status_t *error)
|
|
{
|
|
struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
|
|
|
|
if (bioctx->status == BLK_STS_OK && *error)
|
|
bioctx->status = *error;
|
|
|
|
if (!atomic_dec_and_test(&bioctx->ref))
|
|
return DM_ENDIO_INCOMPLETE;
|
|
|
|
/* Done */
|
|
bio->bi_status = bioctx->status;
|
|
|
|
if (bioctx->zone) {
|
|
struct dm_zone *zone = bioctx->zone;
|
|
|
|
if (*error && bio_op(bio) == REQ_OP_WRITE) {
|
|
if (dmz_is_seq(zone))
|
|
set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
|
|
}
|
|
dmz_deactivate_zone(zone);
|
|
}
|
|
|
|
return DM_ENDIO_DONE;
|
|
}
|
|
|
|
/*
|
|
* Get zoned device information.
|
|
*/
|
|
static int dmz_get_zoned_device(struct dm_target *ti, char *path)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct request_queue *q;
|
|
struct dmz_dev *dev;
|
|
sector_t aligned_capacity;
|
|
int ret;
|
|
|
|
/* Get the target device */
|
|
ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &dmz->ddev);
|
|
if (ret) {
|
|
ti->error = "Get target device failed";
|
|
dmz->ddev = NULL;
|
|
return ret;
|
|
}
|
|
|
|
dev = kzalloc(sizeof(struct dmz_dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
dev->bdev = dmz->ddev->bdev;
|
|
(void)bdevname(dev->bdev, dev->name);
|
|
|
|
if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) {
|
|
ti->error = "Not a zoned block device";
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
q = bdev_get_queue(dev->bdev);
|
|
dev->capacity = i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT;
|
|
aligned_capacity = dev->capacity & ~(blk_queue_zone_sectors(q) - 1);
|
|
if (ti->begin ||
|
|
((ti->len != dev->capacity) && (ti->len != aligned_capacity))) {
|
|
ti->error = "Partial mapping not supported";
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
dev->zone_nr_sectors = blk_queue_zone_sectors(q);
|
|
dev->zone_nr_sectors_shift = ilog2(dev->zone_nr_sectors);
|
|
|
|
dev->zone_nr_blocks = dmz_sect2blk(dev->zone_nr_sectors);
|
|
dev->zone_nr_blocks_shift = ilog2(dev->zone_nr_blocks);
|
|
|
|
dev->nr_zones = (dev->capacity + dev->zone_nr_sectors - 1)
|
|
>> dev->zone_nr_sectors_shift;
|
|
|
|
dmz->dev = dev;
|
|
|
|
return 0;
|
|
err:
|
|
dm_put_device(ti, dmz->ddev);
|
|
kfree(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Cleanup zoned device information.
|
|
*/
|
|
static void dmz_put_zoned_device(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
|
|
dm_put_device(ti, dmz->ddev);
|
|
kfree(dmz->dev);
|
|
dmz->dev = NULL;
|
|
}
|
|
|
|
/*
|
|
* Setup target.
|
|
*/
|
|
static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
|
|
{
|
|
struct dmz_target *dmz;
|
|
struct dmz_dev *dev;
|
|
int ret;
|
|
|
|
/* 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;
|
|
}
|
|
ti->private = dmz;
|
|
|
|
/* Get the target zoned block device */
|
|
ret = dmz_get_zoned_device(ti, argv[0]);
|
|
if (ret) {
|
|
dmz->ddev = NULL;
|
|
goto err;
|
|
}
|
|
|
|
/* Initialize metadata */
|
|
dev = dmz->dev;
|
|
ret = dmz_ctr_metadata(dev, &dmz->metadata);
|
|
if (ret) {
|
|
ti->error = "Metadata initialization failed";
|
|
goto err_dev;
|
|
}
|
|
|
|
/* Set target (no write same support) */
|
|
ti->max_io_len = dev->zone_nr_sectors << 9;
|
|
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;
|
|
ti->split_discard_bios = true;
|
|
|
|
/* The exposed capacity is the number of chunks that can be mapped */
|
|
ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) << dev->zone_nr_sectors_shift;
|
|
|
|
/* Zone BIO */
|
|
dmz->bio_set = bioset_create(DMZ_MIN_BIOS, 0, 0);
|
|
if (!dmz->bio_set) {
|
|
ti->error = "Create BIO set failed";
|
|
ret = -ENOMEM;
|
|
goto err_meta;
|
|
}
|
|
|
|
/* Chunk BIO work */
|
|
mutex_init(&dmz->chunk_lock);
|
|
INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_KERNEL);
|
|
dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s", WQ_MEM_RECLAIM | WQ_UNBOUND,
|
|
0, dev->name);
|
|
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,
|
|
dev->name);
|
|
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 */
|
|
ret = dmz_ctr_reclaim(dev, dmz->metadata, &dmz->reclaim);
|
|
if (ret) {
|
|
ti->error = "Zone reclaim initialization failed";
|
|
goto err_fwq;
|
|
}
|
|
|
|
dmz_dev_info(dev, "Target device: %llu 512-byte logical sectors (%llu blocks)",
|
|
(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:
|
|
bioset_free(dmz->bio_set);
|
|
err_meta:
|
|
dmz_dtr_metadata(dmz->metadata);
|
|
err_dev:
|
|
dmz_put_zoned_device(ti);
|
|
err:
|
|
kfree(dmz);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Cleanup target.
|
|
*/
|
|
static void dmz_dtr(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
|
|
flush_workqueue(dmz->chunk_wq);
|
|
destroy_workqueue(dmz->chunk_wq);
|
|
|
|
dmz_dtr_reclaim(dmz->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_free(dmz->bio_set);
|
|
|
|
dmz_put_zoned_device(ti);
|
|
|
|
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->dev->zone_nr_sectors;
|
|
|
|
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 = DMZ_BLOCK_SIZE;
|
|
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, fmode_t *mode)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
|
|
*bdev = dmz->dev->bdev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Stop works on suspend.
|
|
*/
|
|
static void dmz_suspend(struct dm_target *ti)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
|
|
flush_workqueue(dmz->chunk_wq);
|
|
dmz_suspend_reclaim(dmz->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;
|
|
|
|
queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
|
|
dmz_resume_reclaim(dmz->reclaim);
|
|
}
|
|
|
|
static int dmz_iterate_devices(struct dm_target *ti,
|
|
iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
struct dmz_target *dmz = ti->private;
|
|
struct dmz_dev *dev = dmz->dev;
|
|
sector_t capacity = dev->capacity & ~(dev->zone_nr_sectors - 1);
|
|
|
|
return fn(ti, dmz->ddev, 0, capacity, data);
|
|
}
|
|
|
|
static struct target_type dmz_type = {
|
|
.name = "zoned",
|
|
.version = {1, 0, 0},
|
|
.features = DM_TARGET_SINGLETON | DM_TARGET_ZONED_HM,
|
|
.module = THIS_MODULE,
|
|
.ctr = dmz_ctr,
|
|
.dtr = dmz_dtr,
|
|
.map = dmz_map,
|
|
.end_io = dmz_end_io,
|
|
.io_hints = dmz_io_hints,
|
|
.prepare_ioctl = dmz_prepare_ioctl,
|
|
.postsuspend = dmz_suspend,
|
|
.resume = dmz_resume,
|
|
.iterate_devices = dmz_iterate_devices,
|
|
};
|
|
|
|
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");
|