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