639 lines
17 KiB
C
639 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Zoned block device handling
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*
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* Copyright (c) 2015, Hannes Reinecke
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* Copyright (c) 2015, SUSE Linux GmbH
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*
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* Copyright (c) 2016, Damien Le Moal
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* Copyright (c) 2016, Western Digital
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rbtree.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/sched/mm.h>
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#include "blk.h"
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#define ZONE_COND_NAME(name) [BLK_ZONE_COND_##name] = #name
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static const char *const zone_cond_name[] = {
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ZONE_COND_NAME(NOT_WP),
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ZONE_COND_NAME(EMPTY),
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ZONE_COND_NAME(IMP_OPEN),
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ZONE_COND_NAME(EXP_OPEN),
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ZONE_COND_NAME(CLOSED),
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ZONE_COND_NAME(READONLY),
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ZONE_COND_NAME(FULL),
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ZONE_COND_NAME(OFFLINE),
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};
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#undef ZONE_COND_NAME
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/**
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* blk_zone_cond_str - Return string XXX in BLK_ZONE_COND_XXX.
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* @zone_cond: BLK_ZONE_COND_XXX.
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*
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* Description: Centralize block layer function to convert BLK_ZONE_COND_XXX
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* into string format. Useful in the debugging and tracing zone conditions. For
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* invalid BLK_ZONE_COND_XXX it returns string "UNKNOWN".
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*/
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const char *blk_zone_cond_str(enum blk_zone_cond zone_cond)
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{
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static const char *zone_cond_str = "UNKNOWN";
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if (zone_cond < ARRAY_SIZE(zone_cond_name) && zone_cond_name[zone_cond])
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zone_cond_str = zone_cond_name[zone_cond];
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return zone_cond_str;
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}
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EXPORT_SYMBOL_GPL(blk_zone_cond_str);
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/*
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* Return true if a request is a write requests that needs zone write locking.
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*/
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bool blk_req_needs_zone_write_lock(struct request *rq)
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{
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if (blk_rq_is_passthrough(rq))
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return false;
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if (!rq->q->disk->seq_zones_wlock)
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return false;
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if (bdev_op_is_zoned_write(rq->q->disk->part0, req_op(rq)))
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return blk_rq_zone_is_seq(rq);
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return false;
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}
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EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
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bool blk_req_zone_write_trylock(struct request *rq)
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{
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unsigned int zno = blk_rq_zone_no(rq);
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if (test_and_set_bit(zno, rq->q->disk->seq_zones_wlock))
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return false;
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WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
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rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
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return true;
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}
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EXPORT_SYMBOL_GPL(blk_req_zone_write_trylock);
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void __blk_req_zone_write_lock(struct request *rq)
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{
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if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
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rq->q->disk->seq_zones_wlock)))
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return;
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WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
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rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
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}
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EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);
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void __blk_req_zone_write_unlock(struct request *rq)
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{
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rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
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if (rq->q->disk->seq_zones_wlock)
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WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
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rq->q->disk->seq_zones_wlock));
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}
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EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
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/**
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* bdev_nr_zones - Get number of zones
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* @bdev: Target device
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*
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* Return the total number of zones of a zoned block device. For a block
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* device without zone capabilities, the number of zones is always 0.
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*/
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unsigned int bdev_nr_zones(struct block_device *bdev)
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{
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sector_t zone_sectors = bdev_zone_sectors(bdev);
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if (!bdev_is_zoned(bdev))
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return 0;
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return (bdev_nr_sectors(bdev) + zone_sectors - 1) >>
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ilog2(zone_sectors);
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}
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EXPORT_SYMBOL_GPL(bdev_nr_zones);
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/**
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* blkdev_report_zones - Get zones information
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* @bdev: Target block device
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* @sector: Sector from which to report zones
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* @nr_zones: Maximum number of zones to report
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* @cb: Callback function called for each reported zone
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* @data: Private data for the callback
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*
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* Description:
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* Get zone information starting from the zone containing @sector for at most
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* @nr_zones, and call @cb for each zone reported by the device.
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* To report all zones in a device starting from @sector, the BLK_ALL_ZONES
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* constant can be passed to @nr_zones.
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* Returns the number of zones reported by the device, or a negative errno
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* value in case of failure.
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*
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* Note: The caller must use memalloc_noXX_save/restore() calls to control
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* memory allocations done within this function.
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*/
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int blkdev_report_zones(struct block_device *bdev, sector_t sector,
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unsigned int nr_zones, report_zones_cb cb, void *data)
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{
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struct gendisk *disk = bdev->bd_disk;
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sector_t capacity = get_capacity(disk);
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if (!bdev_is_zoned(bdev) || WARN_ON_ONCE(!disk->fops->report_zones))
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return -EOPNOTSUPP;
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if (!nr_zones || sector >= capacity)
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return 0;
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return disk->fops->report_zones(disk, sector, nr_zones, cb, data);
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}
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EXPORT_SYMBOL_GPL(blkdev_report_zones);
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static inline unsigned long *blk_alloc_zone_bitmap(int node,
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unsigned int nr_zones)
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{
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return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
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GFP_NOIO, node);
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}
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static int blk_zone_need_reset_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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/*
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* For an all-zones reset, ignore conventional, empty, read-only
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* and offline zones.
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*/
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switch (zone->cond) {
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case BLK_ZONE_COND_NOT_WP:
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case BLK_ZONE_COND_EMPTY:
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case BLK_ZONE_COND_READONLY:
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case BLK_ZONE_COND_OFFLINE:
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return 0;
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default:
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set_bit(idx, (unsigned long *)data);
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return 0;
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}
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}
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static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
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gfp_t gfp_mask)
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{
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struct gendisk *disk = bdev->bd_disk;
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sector_t capacity = bdev_nr_sectors(bdev);
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sector_t zone_sectors = bdev_zone_sectors(bdev);
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unsigned long *need_reset;
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struct bio *bio = NULL;
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sector_t sector = 0;
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int ret;
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need_reset = blk_alloc_zone_bitmap(disk->queue->node, disk->nr_zones);
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if (!need_reset)
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return -ENOMEM;
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ret = disk->fops->report_zones(disk, 0, disk->nr_zones,
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blk_zone_need_reset_cb, need_reset);
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if (ret < 0)
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goto out_free_need_reset;
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ret = 0;
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while (sector < capacity) {
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if (!test_bit(disk_zone_no(disk, sector), need_reset)) {
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sector += zone_sectors;
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continue;
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}
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bio = blk_next_bio(bio, bdev, 0, REQ_OP_ZONE_RESET | REQ_SYNC,
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gfp_mask);
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bio->bi_iter.bi_sector = sector;
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sector += zone_sectors;
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/* This may take a while, so be nice to others */
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cond_resched();
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}
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if (bio) {
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ret = submit_bio_wait(bio);
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bio_put(bio);
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}
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out_free_need_reset:
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kfree(need_reset);
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return ret;
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}
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static int blkdev_zone_reset_all(struct block_device *bdev, gfp_t gfp_mask)
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{
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struct bio bio;
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bio_init(&bio, bdev, NULL, 0, REQ_OP_ZONE_RESET_ALL | REQ_SYNC);
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return submit_bio_wait(&bio);
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}
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/**
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* blkdev_zone_mgmt - Execute a zone management operation on a range of zones
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* @bdev: Target block device
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* @op: Operation to be performed on the zones
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* @sector: Start sector of the first zone to operate on
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* @nr_sectors: Number of sectors, should be at least the length of one zone and
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* must be zone size aligned.
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* @gfp_mask: Memory allocation flags (for bio_alloc)
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*
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* Description:
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* Perform the specified operation on the range of zones specified by
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* @sector..@sector+@nr_sectors. Specifying the entire disk sector range
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* is valid, but the specified range should not contain conventional zones.
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* The operation to execute on each zone can be a zone reset, open, close
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* or finish request.
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*/
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int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
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sector_t sector, sector_t nr_sectors, gfp_t gfp_mask)
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{
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struct request_queue *q = bdev_get_queue(bdev);
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sector_t zone_sectors = bdev_zone_sectors(bdev);
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sector_t capacity = bdev_nr_sectors(bdev);
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sector_t end_sector = sector + nr_sectors;
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struct bio *bio = NULL;
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int ret = 0;
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if (!bdev_is_zoned(bdev))
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return -EOPNOTSUPP;
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if (bdev_read_only(bdev))
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return -EPERM;
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if (!op_is_zone_mgmt(op))
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return -EOPNOTSUPP;
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if (end_sector <= sector || end_sector > capacity)
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/* Out of range */
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return -EINVAL;
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/* Check alignment (handle eventual smaller last zone) */
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if (sector & (zone_sectors - 1))
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return -EINVAL;
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if ((nr_sectors & (zone_sectors - 1)) && end_sector != capacity)
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return -EINVAL;
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/*
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* In the case of a zone reset operation over all zones,
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* REQ_OP_ZONE_RESET_ALL can be used with devices supporting this
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* command. For other devices, we emulate this command behavior by
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* identifying the zones needing a reset.
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*/
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if (op == REQ_OP_ZONE_RESET && sector == 0 && nr_sectors == capacity) {
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if (!blk_queue_zone_resetall(q))
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return blkdev_zone_reset_all_emulated(bdev, gfp_mask);
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return blkdev_zone_reset_all(bdev, gfp_mask);
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}
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while (sector < end_sector) {
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bio = blk_next_bio(bio, bdev, 0, op | REQ_SYNC, gfp_mask);
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bio->bi_iter.bi_sector = sector;
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sector += zone_sectors;
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/* This may take a while, so be nice to others */
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cond_resched();
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}
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ret = submit_bio_wait(bio);
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bio_put(bio);
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_zone_mgmt);
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struct zone_report_args {
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struct blk_zone __user *zones;
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};
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static int blkdev_copy_zone_to_user(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct zone_report_args *args = data;
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if (copy_to_user(&args->zones[idx], zone, sizeof(struct blk_zone)))
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return -EFAULT;
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return 0;
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}
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/*
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* BLKREPORTZONE ioctl processing.
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* Called from blkdev_ioctl.
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*/
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int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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struct zone_report_args args;
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struct request_queue *q;
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struct blk_zone_report rep;
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int ret;
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if (!argp)
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return -EINVAL;
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q = bdev_get_queue(bdev);
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if (!q)
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return -ENXIO;
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if (!bdev_is_zoned(bdev))
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return -ENOTTY;
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if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
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return -EFAULT;
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if (!rep.nr_zones)
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return -EINVAL;
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args.zones = argp + sizeof(struct blk_zone_report);
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ret = blkdev_report_zones(bdev, rep.sector, rep.nr_zones,
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blkdev_copy_zone_to_user, &args);
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if (ret < 0)
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return ret;
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rep.nr_zones = ret;
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rep.flags = BLK_ZONE_REP_CAPACITY;
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if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report)))
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return -EFAULT;
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return 0;
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}
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static int blkdev_truncate_zone_range(struct block_device *bdev, fmode_t mode,
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const struct blk_zone_range *zrange)
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{
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loff_t start, end;
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if (zrange->sector + zrange->nr_sectors <= zrange->sector ||
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zrange->sector + zrange->nr_sectors > get_capacity(bdev->bd_disk))
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/* Out of range */
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return -EINVAL;
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start = zrange->sector << SECTOR_SHIFT;
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end = ((zrange->sector + zrange->nr_sectors) << SECTOR_SHIFT) - 1;
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return truncate_bdev_range(bdev, mode, start, end);
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}
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/*
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* BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE ioctl processing.
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* Called from blkdev_ioctl.
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*/
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int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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struct request_queue *q;
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struct blk_zone_range zrange;
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enum req_op op;
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int ret;
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if (!argp)
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return -EINVAL;
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q = bdev_get_queue(bdev);
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if (!q)
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return -ENXIO;
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if (!bdev_is_zoned(bdev))
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return -ENOTTY;
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
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return -EFAULT;
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switch (cmd) {
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case BLKRESETZONE:
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op = REQ_OP_ZONE_RESET;
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/* Invalidate the page cache, including dirty pages. */
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filemap_invalidate_lock(bdev->bd_inode->i_mapping);
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ret = blkdev_truncate_zone_range(bdev, mode, &zrange);
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if (ret)
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goto fail;
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break;
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case BLKOPENZONE:
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op = REQ_OP_ZONE_OPEN;
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break;
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case BLKCLOSEZONE:
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op = REQ_OP_ZONE_CLOSE;
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break;
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case BLKFINISHZONE:
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op = REQ_OP_ZONE_FINISH;
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break;
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default:
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return -ENOTTY;
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}
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ret = blkdev_zone_mgmt(bdev, op, zrange.sector, zrange.nr_sectors,
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GFP_KERNEL);
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fail:
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if (cmd == BLKRESETZONE)
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filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
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return ret;
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}
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void disk_free_zone_bitmaps(struct gendisk *disk)
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{
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kfree(disk->conv_zones_bitmap);
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disk->conv_zones_bitmap = NULL;
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kfree(disk->seq_zones_wlock);
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disk->seq_zones_wlock = NULL;
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}
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struct blk_revalidate_zone_args {
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struct gendisk *disk;
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unsigned long *conv_zones_bitmap;
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unsigned long *seq_zones_wlock;
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unsigned int nr_zones;
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sector_t zone_sectors;
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sector_t sector;
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};
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/*
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* Helper function to check the validity of zones of a zoned block device.
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*/
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static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct blk_revalidate_zone_args *args = data;
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struct gendisk *disk = args->disk;
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struct request_queue *q = disk->queue;
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sector_t capacity = get_capacity(disk);
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/*
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* All zones must have the same size, with the exception on an eventual
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* smaller last zone.
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*/
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if (zone->start == 0) {
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if (zone->len == 0 || !is_power_of_2(zone->len)) {
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pr_warn("%s: Invalid zoned device with non power of two zone size (%llu)\n",
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disk->disk_name, zone->len);
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return -ENODEV;
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}
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args->zone_sectors = zone->len;
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args->nr_zones = (capacity + zone->len - 1) >> ilog2(zone->len);
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} else if (zone->start + args->zone_sectors < capacity) {
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if (zone->len != args->zone_sectors) {
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pr_warn("%s: Invalid zoned device with non constant zone size\n",
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disk->disk_name);
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return -ENODEV;
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}
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} else {
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if (zone->len > args->zone_sectors) {
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pr_warn("%s: Invalid zoned device with larger last zone size\n",
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disk->disk_name);
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return -ENODEV;
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}
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}
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/* Check for holes in the zone report */
|
|
if (zone->start != args->sector) {
|
|
pr_warn("%s: Zone gap at sectors %llu..%llu\n",
|
|
disk->disk_name, args->sector, zone->start);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Check zone type */
|
|
switch (zone->type) {
|
|
case BLK_ZONE_TYPE_CONVENTIONAL:
|
|
if (!args->conv_zones_bitmap) {
|
|
args->conv_zones_bitmap =
|
|
blk_alloc_zone_bitmap(q->node, args->nr_zones);
|
|
if (!args->conv_zones_bitmap)
|
|
return -ENOMEM;
|
|
}
|
|
set_bit(idx, args->conv_zones_bitmap);
|
|
break;
|
|
case BLK_ZONE_TYPE_SEQWRITE_REQ:
|
|
case BLK_ZONE_TYPE_SEQWRITE_PREF:
|
|
if (!args->seq_zones_wlock) {
|
|
args->seq_zones_wlock =
|
|
blk_alloc_zone_bitmap(q->node, args->nr_zones);
|
|
if (!args->seq_zones_wlock)
|
|
return -ENOMEM;
|
|
}
|
|
break;
|
|
default:
|
|
pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n",
|
|
disk->disk_name, (int)zone->type, zone->start);
|
|
return -ENODEV;
|
|
}
|
|
|
|
args->sector += zone->len;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
|
|
* @disk: Target disk
|
|
* @update_driver_data: Callback to update driver data on the frozen disk
|
|
*
|
|
* Helper function for low-level device drivers to (re) allocate and initialize
|
|
* a disk request queue zone bitmaps. This functions should normally be called
|
|
* within the disk ->revalidate method for blk-mq based drivers. For BIO based
|
|
* drivers only q->nr_zones needs to be updated so that the sysfs exposed value
|
|
* is correct.
|
|
* If the @update_driver_data callback function is not NULL, the callback is
|
|
* executed with the device request queue frozen after all zones have been
|
|
* checked.
|
|
*/
|
|
int blk_revalidate_disk_zones(struct gendisk *disk,
|
|
void (*update_driver_data)(struct gendisk *disk))
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
struct blk_revalidate_zone_args args = {
|
|
.disk = disk,
|
|
};
|
|
unsigned int noio_flag;
|
|
int ret;
|
|
|
|
if (WARN_ON_ONCE(!blk_queue_is_zoned(q)))
|
|
return -EIO;
|
|
if (WARN_ON_ONCE(!queue_is_mq(q)))
|
|
return -EIO;
|
|
|
|
if (!get_capacity(disk))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Ensure that all memory allocations in this context are done as if
|
|
* GFP_NOIO was specified.
|
|
*/
|
|
noio_flag = memalloc_noio_save();
|
|
ret = disk->fops->report_zones(disk, 0, UINT_MAX,
|
|
blk_revalidate_zone_cb, &args);
|
|
if (!ret) {
|
|
pr_warn("%s: No zones reported\n", disk->disk_name);
|
|
ret = -ENODEV;
|
|
}
|
|
memalloc_noio_restore(noio_flag);
|
|
|
|
/*
|
|
* If zones where reported, make sure that the entire disk capacity
|
|
* has been checked.
|
|
*/
|
|
if (ret > 0 && args.sector != get_capacity(disk)) {
|
|
pr_warn("%s: Missing zones from sector %llu\n",
|
|
disk->disk_name, args.sector);
|
|
ret = -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Install the new bitmaps and update nr_zones only once the queue is
|
|
* stopped and all I/Os are completed (i.e. a scheduler is not
|
|
* referencing the bitmaps).
|
|
*/
|
|
blk_mq_freeze_queue(q);
|
|
if (ret > 0) {
|
|
blk_queue_chunk_sectors(q, args.zone_sectors);
|
|
disk->nr_zones = args.nr_zones;
|
|
swap(disk->seq_zones_wlock, args.seq_zones_wlock);
|
|
swap(disk->conv_zones_bitmap, args.conv_zones_bitmap);
|
|
if (update_driver_data)
|
|
update_driver_data(disk);
|
|
ret = 0;
|
|
} else {
|
|
pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
|
|
disk_free_zone_bitmaps(disk);
|
|
}
|
|
blk_mq_unfreeze_queue(q);
|
|
|
|
kfree(args.seq_zones_wlock);
|
|
kfree(args.conv_zones_bitmap);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
|
|
|
|
void disk_clear_zone_settings(struct gendisk *disk)
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
|
|
blk_mq_freeze_queue(q);
|
|
|
|
disk_free_zone_bitmaps(disk);
|
|
blk_queue_flag_clear(QUEUE_FLAG_ZONE_RESETALL, q);
|
|
q->required_elevator_features &= ~ELEVATOR_F_ZBD_SEQ_WRITE;
|
|
disk->nr_zones = 0;
|
|
disk->max_open_zones = 0;
|
|
disk->max_active_zones = 0;
|
|
q->limits.chunk_sectors = 0;
|
|
q->limits.zone_write_granularity = 0;
|
|
q->limits.max_zone_append_sectors = 0;
|
|
|
|
blk_mq_unfreeze_queue(q);
|
|
}
|