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-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl7VOwMQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpoR7EADAlz3TCkb4wwuHytTBDrm6gVDdsJ9zUfQW Cl2ASLtufA8PWZUCEI3vhFyOe6P5e+ZZ0O2HjljSevmHyogCaRYXFYVfbWKcQKuk AcxiTgnYNevh8KbGLfJY1WL4eXsY+C3QUGivg35cCgrx+kr9oDaHMeqA9Tm1plyM FSprDBoSmHPqRxiV/1gnr8uXLX6K7i/fHzwmKgySMhavum7Ma8W3wdAGebzvQwrO SbFSuJVgz06e4B1Fzr/wSvVNUE/qW/KqfGuQKIp7VQFIywbgG7TgRMHjE1FSnpnh gn+BfL+O5gc0sTvcOTGOE0SRWWwLx961WNg8Azq08l3fzsxLA6h8/AnoDf3i+QMA rHmLpWZIic2xPSvjaFHX3/V9ITyGYeAMpAR77EL+4ivWrKv5JrBhnSLDt1fKILdg 5elxm7RDI+C4nCP4xuTlVCy5gCd6gwjgytKj+NUWhNq1WiGAD0B54SSiV+SbCSH6 Om2f5trcxz8E4pqWcf0k3LjFapVKRNV8v/+TmVkCdRPBl3y9P0h0wFTkkcEquqnJ y7Yq6efdWviRCnX5w/r/yj0qBuk4xo5hMVsPmlthCWtnBm+xZQ6LwMRcq4HQgZgR 2SYNscZ3OFMekHssH7DvY4DAy1J+n83ims+KzbScbLg2zCZjh/scQuv38R5Eh9WZ rCS8c+T7Ig== =HYf4 -----END PGP SIGNATURE----- Merge tag 'for-5.8/block-2020-06-01' of git://git.kernel.dk/linux-block Pull block updates from Jens Axboe: "Core block changes that have been queued up for this release: - Remove dead blk-throttle and blk-wbt code (Guoqing) - Include pid in blktrace note traces (Jan) - Don't spew I/O errors on wouldblock termination (me) - Zone append addition (Johannes, Keith, Damien) - IO accounting improvements (Konstantin, Christoph) - blk-mq hardware map update improvements (Ming) - Scheduler dispatch improvement (Salman) - Inline block encryption support (Satya) - Request map fixes and improvements (Weiping) - blk-iocost tweaks (Tejun) - Fix for timeout failing with error injection (Keith) - Queue re-run fixes (Douglas) - CPU hotplug improvements (Christoph) - Queue entry/exit improvements (Christoph) - Move DMA drain handling to the few drivers that use it (Christoph) - Partition handling cleanups (Christoph)" * tag 'for-5.8/block-2020-06-01' of git://git.kernel.dk/linux-block: (127 commits) block: mark bio_wouldblock_error() bio with BIO_QUIET blk-wbt: rename __wbt_update_limits to wbt_update_limits blk-wbt: remove wbt_update_limits blk-throttle: remove tg_drain_bios blk-throttle: remove blk_throtl_drain null_blk: force complete for timeout request blk-mq: drain I/O when all CPUs in a hctx are offline blk-mq: add blk_mq_all_tag_iter blk-mq: open code __blk_mq_alloc_request in blk_mq_alloc_request_hctx blk-mq: use BLK_MQ_NO_TAG in more places blk-mq: rename BLK_MQ_TAG_FAIL to BLK_MQ_NO_TAG blk-mq: move more request initialization to blk_mq_rq_ctx_init blk-mq: simplify the blk_mq_get_request calling convention blk-mq: remove the bio argument to ->prepare_request nvme: force complete cancelled requests blk-mq: blk-mq: provide forced completion method block: fix a warning when blkdev.h is included for !CONFIG_BLOCK builds block: blk-crypto-fallback: remove redundant initialization of variable err block: reduce part_stat_lock() scope block: use __this_cpu_add() instead of access by smp_processor_id() ...
281 lines
7.1 KiB
C
281 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/vmalloc.h>
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#include "null_blk.h"
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#define CREATE_TRACE_POINTS
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#include "null_blk_trace.h"
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/* zone_size in MBs to sectors. */
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#define ZONE_SIZE_SHIFT 11
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static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
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{
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return sect >> ilog2(dev->zone_size_sects);
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}
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int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
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{
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sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
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sector_t sector = 0;
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unsigned int i;
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if (!is_power_of_2(dev->zone_size)) {
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pr_err("zone_size must be power-of-two\n");
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return -EINVAL;
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}
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if (dev->zone_size > dev->size) {
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pr_err("Zone size larger than device capacity\n");
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return -EINVAL;
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}
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dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
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dev->nr_zones = dev_size >>
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(SECTOR_SHIFT + ilog2(dev->zone_size_sects));
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dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
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GFP_KERNEL | __GFP_ZERO);
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if (!dev->zones)
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return -ENOMEM;
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if (dev->zone_nr_conv >= dev->nr_zones) {
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dev->zone_nr_conv = dev->nr_zones - 1;
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pr_info("changed the number of conventional zones to %u",
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dev->zone_nr_conv);
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}
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for (i = 0; i < dev->zone_nr_conv; i++) {
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struct blk_zone *zone = &dev->zones[i];
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zone->start = sector;
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zone->len = dev->zone_size_sects;
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zone->wp = zone->start + zone->len;
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zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
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zone->cond = BLK_ZONE_COND_NOT_WP;
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sector += dev->zone_size_sects;
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}
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for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
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struct blk_zone *zone = &dev->zones[i];
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zone->start = zone->wp = sector;
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zone->len = dev->zone_size_sects;
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zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
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zone->cond = BLK_ZONE_COND_EMPTY;
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sector += dev->zone_size_sects;
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}
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q->limits.zoned = BLK_ZONED_HM;
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blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
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blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
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return 0;
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}
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int null_register_zoned_dev(struct nullb *nullb)
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{
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struct nullb_device *dev = nullb->dev;
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struct request_queue *q = nullb->q;
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if (queue_is_mq(q)) {
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int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
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if (ret)
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return ret;
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} else {
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blk_queue_chunk_sectors(q, dev->zone_size_sects);
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q->nr_zones = blkdev_nr_zones(nullb->disk);
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}
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blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
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return 0;
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}
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void null_free_zoned_dev(struct nullb_device *dev)
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{
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kvfree(dev->zones);
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}
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int null_report_zones(struct gendisk *disk, 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 nullb *nullb = disk->private_data;
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struct nullb_device *dev = nullb->dev;
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unsigned int first_zone, i;
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struct blk_zone zone;
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int error;
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first_zone = null_zone_no(dev, sector);
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if (first_zone >= dev->nr_zones)
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return 0;
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nr_zones = min(nr_zones, dev->nr_zones - first_zone);
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trace_nullb_report_zones(nullb, nr_zones);
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for (i = 0; i < nr_zones; i++) {
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/*
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* Stacked DM target drivers will remap the zone information by
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* modifying the zone information passed to the report callback.
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* So use a local copy to avoid corruption of the device zone
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* array.
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*/
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memcpy(&zone, &dev->zones[first_zone + i],
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sizeof(struct blk_zone));
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error = cb(&zone, i, data);
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if (error)
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return error;
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}
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return nr_zones;
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}
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size_t null_zone_valid_read_len(struct nullb *nullb,
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sector_t sector, unsigned int len)
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{
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struct nullb_device *dev = nullb->dev;
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struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
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unsigned int nr_sectors = len >> SECTOR_SHIFT;
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/* Read must be below the write pointer position */
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
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sector + nr_sectors <= zone->wp)
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return len;
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if (sector > zone->wp)
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return 0;
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return (zone->wp - sector) << SECTOR_SHIFT;
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}
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static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
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unsigned int nr_sectors, bool append)
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{
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struct nullb_device *dev = cmd->nq->dev;
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unsigned int zno = null_zone_no(dev, sector);
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struct blk_zone *zone = &dev->zones[zno];
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blk_status_t ret;
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trace_nullb_zone_op(cmd, zno, zone->cond);
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
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switch (zone->cond) {
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case BLK_ZONE_COND_FULL:
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/* Cannot write to a full zone */
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return BLK_STS_IOERR;
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case BLK_ZONE_COND_EMPTY:
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case BLK_ZONE_COND_IMP_OPEN:
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case BLK_ZONE_COND_EXP_OPEN:
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case BLK_ZONE_COND_CLOSED:
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/*
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* Regular writes must be at the write pointer position.
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* Zone append writes are automatically issued at the write
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* pointer and the position returned using the request or BIO
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* sector.
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*/
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if (append) {
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sector = zone->wp;
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if (cmd->bio)
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cmd->bio->bi_iter.bi_sector = sector;
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else
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cmd->rq->__sector = sector;
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} else if (sector != zone->wp) {
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return BLK_STS_IOERR;
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}
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if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
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zone->cond = BLK_ZONE_COND_IMP_OPEN;
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ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
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if (ret != BLK_STS_OK)
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return ret;
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zone->wp += nr_sectors;
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if (zone->wp == zone->start + zone->len)
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zone->cond = BLK_ZONE_COND_FULL;
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return BLK_STS_OK;
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default:
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/* Invalid zone condition */
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return BLK_STS_IOERR;
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}
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}
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static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
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sector_t sector)
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{
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struct nullb_device *dev = cmd->nq->dev;
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unsigned int zone_no = null_zone_no(dev, sector);
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struct blk_zone *zone = &dev->zones[zone_no];
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size_t i;
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switch (op) {
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case REQ_OP_ZONE_RESET_ALL:
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for (i = 0; i < dev->nr_zones; i++) {
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if (zone[i].type == BLK_ZONE_TYPE_CONVENTIONAL)
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continue;
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zone[i].cond = BLK_ZONE_COND_EMPTY;
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zone[i].wp = zone[i].start;
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}
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break;
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case REQ_OP_ZONE_RESET:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_EMPTY;
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zone->wp = zone->start;
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break;
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case REQ_OP_ZONE_OPEN:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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if (zone->cond == BLK_ZONE_COND_FULL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_EXP_OPEN;
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break;
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case REQ_OP_ZONE_CLOSE:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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if (zone->cond == BLK_ZONE_COND_FULL)
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return BLK_STS_IOERR;
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if (zone->wp == zone->start)
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zone->cond = BLK_ZONE_COND_EMPTY;
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else
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zone->cond = BLK_ZONE_COND_CLOSED;
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break;
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case REQ_OP_ZONE_FINISH:
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
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return BLK_STS_IOERR;
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zone->cond = BLK_ZONE_COND_FULL;
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zone->wp = zone->start + zone->len;
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break;
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default:
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return BLK_STS_NOTSUPP;
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}
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trace_nullb_zone_op(cmd, zone_no, zone->cond);
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return BLK_STS_OK;
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}
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blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op,
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sector_t sector, sector_t nr_sectors)
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{
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switch (op) {
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case REQ_OP_WRITE:
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return null_zone_write(cmd, sector, nr_sectors, false);
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case REQ_OP_ZONE_APPEND:
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return null_zone_write(cmd, sector, nr_sectors, true);
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case REQ_OP_ZONE_RESET:
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case REQ_OP_ZONE_RESET_ALL:
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case REQ_OP_ZONE_OPEN:
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case REQ_OP_ZONE_CLOSE:
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case REQ_OP_ZONE_FINISH:
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return null_zone_mgmt(cmd, op, sector);
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default:
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return null_process_cmd(cmd, op, sector, nr_sectors);
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}
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}
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