block: Implement support for zoned block devices
Implement zoned block device zone information reporting and reset.
Zone information are reported as struct blk_zone. This implementation
does not differentiate between host-aware and host-managed device
models and is valid for both. Two functions are provided:
blkdev_report_zones for discovering the zone configuration of a
zoned block device, and blkdev_reset_zones for resetting the write
pointer of sequential zones. The helper function blk_queue_zone_size
and bdev_zone_size are also provided for, as the name suggest,
obtaining the zone size (in 512B sectors) of the zones of the device.
Signed-off-by: Hannes Reinecke <hare@suse.de>
[Damien: * Removed the zone cache
* Implement report zones operation based on earlier proposal
by Shaun Tancheff <shaun.tancheff@seagate.com>]
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Hannes Reinecke
Jens Axboe
Родитель
2d253440b5
Коммит
6a0cb1bc10
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@ -89,6 +89,14 @@ config BLK_DEV_INTEGRITY
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T10/SCSI Data Integrity Field or the T13/ATA External Path
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Protection. If in doubt, say N.
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config BLK_DEV_ZONED
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bool "Zoned block device support"
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---help---
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Block layer zoned block device support. This option enables
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support for ZAC/ZBC host-managed and host-aware zoned block devices.
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Say yes here if you have a ZAC or ZBC storage device.
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config BLK_DEV_THROTTLING
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bool "Block layer bio throttling support"
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depends on BLK_CGROUP=y
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@ -23,3 +23,4 @@ obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
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obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o
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obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
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obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o
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obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o
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@ -0,0 +1,257 @@
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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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static inline sector_t blk_zone_start(struct request_queue *q,
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sector_t sector)
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{
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sector_t zone_mask = blk_queue_zone_size(q) - 1;
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return sector & ~zone_mask;
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}
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/*
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* Check that a zone report belongs to the partition.
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* If yes, fix its start sector and write pointer, copy it in the
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* zone information array and return true. Return false otherwise.
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*/
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static bool blkdev_report_zone(struct block_device *bdev,
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struct blk_zone *rep,
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struct blk_zone *zone)
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{
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sector_t offset = get_start_sect(bdev);
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if (rep->start < offset)
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return false;
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rep->start -= offset;
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if (rep->start + rep->len > bdev->bd_part->nr_sects)
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return false;
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if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL)
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rep->wp = rep->start + rep->len;
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else
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rep->wp -= offset;
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memcpy(zone, rep, sizeof(struct blk_zone));
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return true;
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}
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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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* @zones: Array of zone structures where to return the zones information
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* @nr_zones: Number of zone structures in the zone array
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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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* Get zone information starting from the zone containing @sector.
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* The number of zone information reported may be less than the number
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* requested by @nr_zones. The number of zones actually reported is
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* returned in @nr_zones.
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*/
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int blkdev_report_zones(struct block_device *bdev,
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sector_t sector,
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struct blk_zone *zones,
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unsigned int *nr_zones,
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gfp_t gfp_mask)
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{
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struct request_queue *q = bdev_get_queue(bdev);
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struct blk_zone_report_hdr *hdr;
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unsigned int nrz = *nr_zones;
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struct page *page;
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unsigned int nr_rep;
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size_t rep_bytes;
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unsigned int nr_pages;
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struct bio *bio;
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struct bio_vec *bv;
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unsigned int i, n, nz;
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unsigned int ofst;
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void *addr;
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int ret = 0;
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if (!q)
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return -ENXIO;
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if (!blk_queue_is_zoned(q))
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return -EOPNOTSUPP;
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if (!nrz)
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return 0;
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if (sector > bdev->bd_part->nr_sects) {
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*nr_zones = 0;
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return 0;
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}
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/*
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* The zone report has a header. So make room for it in the
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* payload. Also make sure that the report fits in a single BIO
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* that will not be split down the stack.
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*/
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rep_bytes = sizeof(struct blk_zone_report_hdr) +
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sizeof(struct blk_zone) * nrz;
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rep_bytes = (rep_bytes + PAGE_SIZE - 1) & PAGE_MASK;
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if (rep_bytes > (queue_max_sectors(q) << 9))
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rep_bytes = queue_max_sectors(q) << 9;
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nr_pages = min_t(unsigned int, BIO_MAX_PAGES,
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rep_bytes >> PAGE_SHIFT);
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nr_pages = min_t(unsigned int, nr_pages,
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queue_max_segments(q));
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bio = bio_alloc(gfp_mask, nr_pages);
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if (!bio)
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return -ENOMEM;
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bio->bi_bdev = bdev;
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bio->bi_iter.bi_sector = blk_zone_start(q, sector);
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bio_set_op_attrs(bio, REQ_OP_ZONE_REPORT, 0);
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for (i = 0; i < nr_pages; i++) {
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page = alloc_page(gfp_mask);
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if (!page) {
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ret = -ENOMEM;
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goto out;
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}
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if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
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__free_page(page);
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break;
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}
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}
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if (i == 0)
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ret = -ENOMEM;
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else
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ret = submit_bio_wait(bio);
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if (ret)
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goto out;
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/*
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* Process the report result: skip the header and go through the
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* reported zones to fixup and fixup the zone information for
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* partitions. At the same time, return the zone information into
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* the zone array.
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*/
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n = 0;
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nz = 0;
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nr_rep = 0;
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bio_for_each_segment_all(bv, bio, i) {
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if (!bv->bv_page)
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break;
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addr = kmap_atomic(bv->bv_page);
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/* Get header in the first page */
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ofst = 0;
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if (!nr_rep) {
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hdr = (struct blk_zone_report_hdr *) addr;
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nr_rep = hdr->nr_zones;
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ofst = sizeof(struct blk_zone_report_hdr);
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}
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/* Fixup and report zones */
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while (ofst < bv->bv_len &&
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n < nr_rep && nz < nrz) {
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if (blkdev_report_zone(bdev, addr + ofst, &zones[nz]))
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nz++;
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ofst += sizeof(struct blk_zone);
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n++;
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}
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kunmap_atomic(addr);
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if (n >= nr_rep || nz >= nrz)
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break;
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}
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out:
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bio_for_each_segment_all(bv, bio, i)
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__free_page(bv->bv_page);
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bio_put(bio);
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if (ret == 0)
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*nr_zones = nz;
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_report_zones);
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/**
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* blkdev_reset_zones - Reset zones write pointer
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* @bdev: Target block device
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* @sector: Start sector of the first zone to reset
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* @nr_sectors: Number of sectors, at least the length of one zone
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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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* Reset the write pointer of the zones contained in the range
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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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*/
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int blkdev_reset_zones(struct block_device *bdev,
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sector_t sector, sector_t nr_sectors,
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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;
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sector_t end_sector = sector + nr_sectors;
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struct bio *bio;
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int ret;
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if (!q)
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return -ENXIO;
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if (!blk_queue_is_zoned(q))
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return -EOPNOTSUPP;
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if (end_sector > bdev->bd_part->nr_sects)
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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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zone_sectors = blk_queue_zone_size(q);
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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)) &&
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end_sector != bdev->bd_part->nr_sects)
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return -EINVAL;
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while (sector < end_sector) {
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bio = bio_alloc(gfp_mask, 0);
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bio->bi_iter.bi_sector = sector;
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bio->bi_bdev = bdev;
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bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);
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ret = submit_bio_wait(bio);
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bio_put(bio);
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if (ret)
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return ret;
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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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return 0;
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}
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EXPORT_SYMBOL_GPL(blkdev_reset_zones);
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@ -24,6 +24,7 @@
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#include <linux/rcupdate.h>
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#include <linux/percpu-refcount.h>
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#include <linux/scatterlist.h>
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#include <linux/blkzoned.h>
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struct module;
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struct scsi_ioctl_command;
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@ -302,6 +303,21 @@ struct queue_limits {
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enum blk_zoned_model zoned;
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};
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#ifdef CONFIG_BLK_DEV_ZONED
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struct blk_zone_report_hdr {
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unsigned int nr_zones;
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u8 padding[60];
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};
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extern int blkdev_report_zones(struct block_device *bdev,
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sector_t sector, struct blk_zone *zones,
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unsigned int *nr_zones, gfp_t gfp_mask);
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extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
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sector_t nr_sectors, gfp_t gfp_mask);
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#endif /* CONFIG_BLK_DEV_ZONED */
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struct request_queue {
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/*
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* Together with queue_head for cacheline sharing
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@ -654,6 +670,11 @@ static inline bool blk_queue_is_zoned(struct request_queue *q)
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}
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}
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static inline unsigned int blk_queue_zone_size(struct request_queue *q)
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{
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return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
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}
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/*
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* We regard a request as sync, if either a read or a sync write
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*/
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@ -1401,6 +1422,16 @@ static inline bool bdev_is_zoned(struct block_device *bdev)
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return false;
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}
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static inline unsigned int bdev_zone_size(struct block_device *bdev)
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{
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struct request_queue *q = bdev_get_queue(bdev);
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if (q)
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return blk_queue_zone_size(q);
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return 0;
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}
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static inline int queue_dma_alignment(struct request_queue *q)
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{
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return q ? q->dma_alignment : 511;
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|
|
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@ -70,6 +70,7 @@ header-y += bfs_fs.h
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header-y += binfmts.h
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header-y += blkpg.h
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header-y += blktrace_api.h
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header-y += blkzoned.h
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header-y += bpf_common.h
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header-y += bpf_perf_event.h
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header-y += bpf.h
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|
|
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|
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@ -0,0 +1,103 @@
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/*
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* Zoned block devices handling.
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*
|
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* Copyright (C) 2015 Seagate Technology PLC
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*
|
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* Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
|
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*
|
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* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
|
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* Copyright (C) 2016 Western Digital
|
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*
|
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* This file is licensed under the terms of the GNU General Public
|
||||
* License version 2. This program is licensed "as is" without any
|
||||
* warranty of any kind, whether express or implied.
|
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*/
|
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#ifndef _UAPI_BLKZONED_H
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#define _UAPI_BLKZONED_H
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#include <linux/types.h>
|
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|
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/**
|
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* enum blk_zone_type - Types of zones allowed in a zoned device.
|
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*
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* @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
|
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* randomly. Zone reset has no effect on the zone.
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* @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
|
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* @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
|
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*
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* Any other value not defined is reserved and must be considered as invalid.
|
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*/
|
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enum blk_zone_type {
|
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BLK_ZONE_TYPE_CONVENTIONAL = 0x1,
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BLK_ZONE_TYPE_SEQWRITE_REQ = 0x2,
|
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BLK_ZONE_TYPE_SEQWRITE_PREF = 0x3,
|
||||
};
|
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|
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/**
|
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* enum blk_zone_cond - Condition [state] of a zone in a zoned device.
|
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*
|
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* @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
|
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* @BLK_ZONE_COND_EMPTY: The zone is empty.
|
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* @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
|
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* @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
|
||||
* OPEN ZONE command.
|
||||
* @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
|
||||
* @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
|
||||
* FINISH ZONE command.
|
||||
* @BLK_ZONE_COND_READONLY: The zone is read-only.
|
||||
* @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
|
||||
*
|
||||
* The Zone Condition state machine in the ZBC/ZAC standards maps the above
|
||||
* deinitions as:
|
||||
* - ZC1: Empty | BLK_ZONE_EMPTY
|
||||
* - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
|
||||
* - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
|
||||
* - ZC4: Closed | BLK_ZONE_CLOSED
|
||||
* - ZC5: Full | BLK_ZONE_FULL
|
||||
* - ZC6: Read Only | BLK_ZONE_READONLY
|
||||
* - ZC7: Offline | BLK_ZONE_OFFLINE
|
||||
*
|
||||
* Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
|
||||
* be considered invalid.
|
||||
*/
|
||||
enum blk_zone_cond {
|
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BLK_ZONE_COND_NOT_WP = 0x0,
|
||||
BLK_ZONE_COND_EMPTY = 0x1,
|
||||
BLK_ZONE_COND_IMP_OPEN = 0x2,
|
||||
BLK_ZONE_COND_EXP_OPEN = 0x3,
|
||||
BLK_ZONE_COND_CLOSED = 0x4,
|
||||
BLK_ZONE_COND_READONLY = 0xD,
|
||||
BLK_ZONE_COND_FULL = 0xE,
|
||||
BLK_ZONE_COND_OFFLINE = 0xF,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
|
||||
*
|
||||
* @start: Zone start in 512 B sector units
|
||||
* @len: Zone length in 512 B sector units
|
||||
* @wp: Zone write pointer location in 512 B sector units
|
||||
* @type: see enum blk_zone_type for possible values
|
||||
* @cond: see enum blk_zone_cond for possible values
|
||||
* @non_seq: Flag indicating that the zone is using non-sequential resources
|
||||
* (for host-aware zoned block devices only).
|
||||
* @reset: Flag indicating that a zone reset is recommended.
|
||||
* @reserved: Padding to 64 B to match the ZBC/ZAC defined zone descriptor size.
|
||||
*
|
||||
* start, len and wp use the regular 512 B sector unit, regardless of the
|
||||
* device logical block size. The overall structure size is 64 B to match the
|
||||
* ZBC/ZAC defined zone descriptor and allow support for future additional
|
||||
* zone information.
|
||||
*/
|
||||
struct blk_zone {
|
||||
__u64 start; /* Zone start sector */
|
||||
__u64 len; /* Zone length in number of sectors */
|
||||
__u64 wp; /* Zone write pointer position */
|
||||
__u8 type; /* Zone type */
|
||||
__u8 cond; /* Zone condition */
|
||||
__u8 non_seq; /* Non-sequential write resources active */
|
||||
__u8 reset; /* Reset write pointer recommended */
|
||||
__u8 reserved[36];
|
||||
};
|
||||
|
||||
#endif /* _UAPI_BLKZONED_H */
|
||||
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