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348 lines
7.6 KiB
348 lines
7.6 KiB
/*
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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_sectors(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;
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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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*nr_zones = nz;
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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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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_sectors(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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/**
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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 request_queue *q;
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struct blk_zone_report rep;
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struct blk_zone *zones;
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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 (!blk_queue_is_zoned(q))
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return -ENOTTY;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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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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zones = kcalloc(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL);
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if (!zones)
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return -ENOMEM;
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ret = blkdev_report_zones(bdev, rep.sector,
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zones, &rep.nr_zones,
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GFP_KERNEL);
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if (ret)
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goto out;
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if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
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ret = -EFAULT;
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goto out;
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}
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if (rep.nr_zones) {
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if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
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sizeof(struct blk_zone) * rep.nr_zones))
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ret = -EFAULT;
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}
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out:
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kfree(zones);
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return ret;
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}
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/**
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* BLKRESETZONE ioctl processing.
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* Called from blkdev_ioctl.
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*/
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int blkdev_reset_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 request_queue *q;
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struct blk_zone_range zrange;
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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 (!blk_queue_is_zoned(q))
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return -ENOTTY;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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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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return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
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GFP_KERNEL);
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}
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