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653 lines
17 KiB
653 lines
17 KiB
// 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 (!rq->q->seq_zones_wlock) |
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return false; |
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if (blk_rq_is_passthrough(rq)) |
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return false; |
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switch (req_op(rq)) { |
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case REQ_OP_WRITE_ZEROES: |
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case REQ_OP_WRITE_SAME: |
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case REQ_OP_WRITE: |
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return blk_rq_zone_is_seq(rq); |
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default: |
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return false; |
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} |
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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->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->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->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->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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* blkdev_nr_zones - Get number of zones |
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* @disk: Target gendisk |
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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 blkdev_nr_zones(struct gendisk *disk) |
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{ |
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sector_t zone_sectors = blk_queue_zone_sectors(disk->queue); |
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if (!blk_queue_is_zoned(disk->queue)) |
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return 0; |
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return (get_capacity(disk) + zone_sectors - 1) >> ilog2(zone_sectors); |
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} |
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EXPORT_SYMBOL_GPL(blkdev_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 (!blk_queue_is_zoned(bdev_get_queue(bdev)) || |
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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 request_queue *q = bdev_get_queue(bdev); |
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sector_t capacity = get_capacity(bdev->bd_disk); |
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sector_t zone_sectors = blk_queue_zone_sectors(q); |
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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(q->node, q->nr_zones); |
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if (!need_reset) |
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return -ENOMEM; |
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ret = bdev->bd_disk->fops->report_zones(bdev->bd_disk, 0, |
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q->nr_zones, blk_zone_need_reset_cb, |
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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(blk_queue_zone_no(q, 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, 0, gfp_mask); |
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bio_set_dev(bio, bdev); |
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bio->bi_opf = REQ_OP_ZONE_RESET | REQ_SYNC; |
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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, NULL, 0); |
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bio_set_dev(&bio, bdev); |
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bio.bi_opf = 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_opf op, |
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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 = blk_queue_zone_sectors(q); |
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sector_t capacity = get_capacity(bdev->bd_disk); |
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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 (!blk_queue_is_zoned(q)) |
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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, 0, gfp_mask); |
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bio_set_dev(bio, bdev); |
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bio->bi_opf = op | REQ_SYNC; |
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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 (!blk_queue_is_zoned(q)) |
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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_opf 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 (!blk_queue_is_zoned(q)) |
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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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ret = blkdev_truncate_zone_range(bdev, mode, &zrange); |
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if (ret) |
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return ret; |
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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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/* |
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* Invalidate the page cache again for zone reset: writes can only be |
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* direct for zoned devices so concurrent writes would not add any page |
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* to the page cache after/during reset. The page cache may be filled |
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* again due to concurrent reads though and dropping the pages for |
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* these is fine. |
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*/ |
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if (!ret && cmd == BLKRESETZONE) |
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ret = blkdev_truncate_zone_range(bdev, mode, &zrange); |
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return ret; |
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} |
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void blk_queue_free_zone_bitmaps(struct request_queue *q) |
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{ |
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kfree(q->conv_zones_bitmap); |
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q->conv_zones_bitmap = NULL; |
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kfree(q->seq_zones_wlock); |
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q->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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/* |
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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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|
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/* Check for holes in the zone report */ |
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if (zone->start != args->sector) { |
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pr_warn("%s: Zone gap at sectors %llu..%llu\n", |
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disk->disk_name, args->sector, zone->start); |
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return -ENODEV; |
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} |
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|
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/* Check zone type */ |
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switch (zone->type) { |
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case BLK_ZONE_TYPE_CONVENTIONAL: |
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if (!args->conv_zones_bitmap) { |
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args->conv_zones_bitmap = |
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blk_alloc_zone_bitmap(q->node, args->nr_zones); |
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if (!args->conv_zones_bitmap) |
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return -ENOMEM; |
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} |
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set_bit(idx, args->conv_zones_bitmap); |
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break; |
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case BLK_ZONE_TYPE_SEQWRITE_REQ: |
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case BLK_ZONE_TYPE_SEQWRITE_PREF: |
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if (!args->seq_zones_wlock) { |
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args->seq_zones_wlock = |
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blk_alloc_zone_bitmap(q->node, args->nr_zones); |
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if (!args->seq_zones_wlock) |
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return -ENOMEM; |
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} |
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break; |
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default: |
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pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n", |
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disk->disk_name, (int)zone->type, zone->start); |
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return -ENODEV; |
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} |
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args->sector += zone->len; |
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return 0; |
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} |
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|
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/** |
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* blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps |
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* @disk: Target disk |
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* @update_driver_data: Callback to update driver data on the frozen disk |
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* |
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* Helper function for low-level device drivers to (re) allocate and initialize |
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* a disk request queue zone bitmaps. This functions should normally be called |
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* within the disk ->revalidate method for blk-mq based drivers. For BIO based |
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* drivers only q->nr_zones needs to be updated so that the sysfs exposed value |
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* is correct. |
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* If the @update_driver_data callback function is not NULL, the callback is |
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* executed with the device request queue frozen after all zones have been |
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* checked. |
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*/ |
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int blk_revalidate_disk_zones(struct gendisk *disk, |
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void (*update_driver_data)(struct gendisk *disk)) |
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{ |
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struct request_queue *q = disk->queue; |
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struct blk_revalidate_zone_args args = { |
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.disk = disk, |
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}; |
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unsigned int noio_flag; |
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int ret; |
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|
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if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) |
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return -EIO; |
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if (WARN_ON_ONCE(!queue_is_mq(q))) |
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return -EIO; |
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|
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if (!get_capacity(disk)) |
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return -EIO; |
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|
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/* |
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* Ensure that all memory allocations in this context are done as if |
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* GFP_NOIO was specified. |
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*/ |
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noio_flag = memalloc_noio_save(); |
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ret = disk->fops->report_zones(disk, 0, UINT_MAX, |
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blk_revalidate_zone_cb, &args); |
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if (!ret) { |
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pr_warn("%s: No zones reported\n", disk->disk_name); |
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ret = -ENODEV; |
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} |
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memalloc_noio_restore(noio_flag); |
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|
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/* |
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* If zones where reported, make sure that the entire disk capacity |
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* has been checked. |
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*/ |
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if (ret > 0 && args.sector != get_capacity(disk)) { |
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pr_warn("%s: Missing zones from sector %llu\n", |
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disk->disk_name, args.sector); |
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ret = -ENODEV; |
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} |
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|
|
/* |
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* Install the new bitmaps and update nr_zones only once the queue is |
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* stopped and all I/Os are completed (i.e. a scheduler is not |
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* referencing the bitmaps). |
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*/ |
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blk_mq_freeze_queue(q); |
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if (ret > 0) { |
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blk_queue_chunk_sectors(q, args.zone_sectors); |
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q->nr_zones = args.nr_zones; |
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swap(q->seq_zones_wlock, args.seq_zones_wlock); |
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swap(q->conv_zones_bitmap, args.conv_zones_bitmap); |
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if (update_driver_data) |
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update_driver_data(disk); |
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ret = 0; |
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} else { |
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pr_warn("%s: failed to revalidate zones\n", disk->disk_name); |
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blk_queue_free_zone_bitmaps(q); |
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} |
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blk_mq_unfreeze_queue(q); |
|
|
|
kfree(args.seq_zones_wlock); |
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kfree(args.conv_zones_bitmap); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones); |
|
|
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void blk_queue_clear_zone_settings(struct request_queue *q) |
|
{ |
|
blk_mq_freeze_queue(q); |
|
|
|
blk_queue_free_zone_bitmaps(q); |
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blk_queue_flag_clear(QUEUE_FLAG_ZONE_RESETALL, q); |
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q->required_elevator_features &= ~ELEVATOR_F_ZBD_SEQ_WRITE; |
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q->nr_zones = 0; |
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q->max_open_zones = 0; |
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q->max_active_zones = 0; |
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q->limits.chunk_sectors = 0; |
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q->limits.zone_write_granularity = 0; |
|
q->limits.max_zone_append_sectors = 0; |
|
|
|
blk_mq_unfreeze_queue(q); |
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}
|
|
|