| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Christoph Hellwig | 694 | 34.61% | 11 | 29.73% |
| Damien Le Moal | 456 | 22.74% | 11 | 29.73% |
| Shaun Tancheff | 310 | 15.46% | 1 | 2.70% |
| Hannes Reinecke | 232 | 11.57% | 1 | 2.70% |
| Chaitanya Kulkarni | 150 | 7.48% | 3 | 8.11% |
| Ajay Joshi | 80 | 3.99% | 2 | 5.41% |
| Johannes Thumshirn | 70 | 3.49% | 2 | 5.41% |
| Matias Björling | 6 | 0.30% | 1 | 2.70% |
| Alexey Dobriyan | 3 | 0.15% | 1 | 2.70% |
| Bart Van Assche | 2 | 0.10% | 2 | 5.41% |
| Jens Axboe | 1 | 0.05% | 1 | 2.70% |
| Arnd Bergmann | 1 | 0.05% | 1 | 2.70% |
| Total | 2005 | 37 |
// SPDX-License-Identifier: GPL-2.0 /* * 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> #include <linux/blk-mq.h> #include <linux/mm.h> #include <linux/vmalloc.h> #include <linux/sched/mm.h> #include "blk.h" #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); static inline sector_t blk_zone_start(struct request_queue *q, sector_t sector) { sector_t zone_mask = blk_queue_zone_sectors(q) - 1; return sector & ~zone_mask; } /* * 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); 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); 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); /** * blkdev_nr_zones - Get number of zones * @disk: Target gendisk * * 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. */ unsigned int blkdev_nr_zones(struct gendisk *disk) { sector_t zone_sectors = blk_queue_zone_sectors(disk->queue); if (!blk_queue_is_zoned(disk->queue)) return 0; return (get_capacity(disk) + zone_sectors - 1) >> ilog2(zone_sectors); } EXPORT_SYMBOL_GPL(blkdev_nr_zones); /** * blkdev_report_zones - Get zones information * @bdev: Target block device * @sector: Sector from which to report zones * @nr_zones: Maximum number of zones to report * @cb: Callback function called for each reported zone * @data: Private data for the callback * * Description: * 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. */ int blkdev_report_zones(struct block_device *bdev, sector_t sector, unsigned int nr_zones, report_zones_cb cb, void *data) { struct gendisk *disk = bdev->bd_disk; sector_t capacity = get_capacity(disk); if (!blk_queue_is_zoned(bdev_get_queue(bdev)) || WARN_ON_ONCE(!disk->fops->report_zones)) return -EOPNOTSUPP; if (!nr_zones || sector >= capacity) return 0; return disk->fops->report_zones(disk, sector, nr_zones, cb, data); } EXPORT_SYMBOL_GPL(blkdev_report_zones); static inline bool blkdev_allow_reset_all_zones(struct block_device *bdev, sector_t sector, sector_t nr_sectors) { if (!blk_queue_zone_resetall(bdev_get_queue(bdev))) return false; /* * REQ_OP_ZONE_RESET_ALL can be executed only if the number of sectors * of the applicable zone range is the entire disk. */ return !sector && nr_sectors == get_capacity(bdev->bd_disk); } /** * blkdev_zone_mgmt - Execute a zone management operation on a range of zones * @bdev: Target block device * @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. * @gfp_mask: Memory allocation flags (for bio_alloc) * * Description: * Perform the specified operation on the range of zones specified by * @sector..@sector+@nr_sectors. Specifying the entire disk sector range * is valid, but the specified range should not contain conventional zones. * The operation to execute on each zone can be a zone reset, open, close * or finish request. */ int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, sector_t sector, sector_t nr_sectors, gfp_t gfp_mask) { struct request_queue *q = bdev_get_queue(bdev); sector_t zone_sectors = blk_queue_zone_sectors(q); sector_t capacity = get_capacity(bdev->bd_disk); sector_t end_sector = sector + nr_sectors; struct bio *bio = NULL; int ret; if (!blk_queue_is_zoned(q)) return -EOPNOTSUPP; if (bdev_read_only(bdev)) return -EPERM; if (!op_is_zone_mgmt(op)) return -EOPNOTSUPP; if (end_sector <= sector || end_sector > capacity) /* Out of range */ return -EINVAL; /* Check alignment (handle eventual smaller last zone) */ if (sector & (zone_sectors - 1)) return -EINVAL; if ((nr_sectors & (zone_sectors - 1)) && end_sector != capacity) return -EINVAL; while (sector < end_sector) { bio = blk_next_bio(bio, 0, gfp_mask); bio_set_dev(bio, bdev); /* * Special case for the zone reset operation that reset all * zones, this is useful for applications like mkfs. */ if (op == REQ_OP_ZONE_RESET && blkdev_allow_reset_all_zones(bdev, sector, nr_sectors)) { bio->bi_opf = REQ_OP_ZONE_RESET_ALL; break; } bio->bi_opf = op | REQ_SYNC; bio->bi_iter.bi_sector = sector; sector += zone_sectors; /* This may take a while, so be nice to others */ cond_resched(); } ret = submit_bio_wait(bio); bio_put(bio); return ret; } EXPORT_SYMBOL_GPL(blkdev_zone_mgmt); 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; } /* * 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; struct zone_report_args args; struct request_queue *q; struct blk_zone_report rep; int ret; if (!argp) return -EINVAL; q = bdev_get_queue(bdev); if (!q) return -ENXIO; if (!blk_queue_is_zoned(q)) return -ENOTTY; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report))) return -EFAULT; if (!rep.nr_zones) return -EINVAL; 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; rep.nr_zones = ret; rep.flags = BLK_ZONE_REP_CAPACITY; if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) return -EFAULT; return 0; } /* * BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE ioctl processing. * Called from blkdev_ioctl. */ int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; struct request_queue *q; struct blk_zone_range zrange; enum req_opf op; if (!argp) return -EINVAL; q = bdev_get_queue(bdev); if (!q) return -ENXIO; if (!blk_queue_is_zoned(q)) return -ENOTTY; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (!(mode & FMODE_WRITE)) return -EBADF; if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range))) return -EFAULT; switch (cmd) { case BLKRESETZONE: op = REQ_OP_ZONE_RESET; 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; } return blkdev_zone_mgmt(bdev, op, zrange.sector, zrange.nr_sectors, GFP_KERNEL); } static inline unsigned long *blk_alloc_zone_bitmap(int node, unsigned int nr_zones) { return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long), GFP_NOIO, node); } void blk_queue_free_zone_bitmaps(struct request_queue *q) { kfree(q->conv_zones_bitmap); q->conv_zones_bitmap = NULL; kfree(q->seq_zones_wlock); q->seq_zones_wlock = NULL; } struct blk_revalidate_zone_args { struct gendisk *disk; unsigned long *conv_zones_bitmap; unsigned long *seq_zones_wlock; unsigned int nr_zones; sector_t zone_sectors; sector_t sector; }; /* * Helper function to check the validity of zones of a zoned block device. */ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx, void *data) { struct blk_revalidate_zone_args *args = data; struct gendisk *disk = args->disk; struct request_queue *q = disk->queue; sector_t capacity = get_capacity(disk); /* * All zones must have the same size, with the exception on an eventual * smaller last zone. */ 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)\n", disk->disk_name, zone->len); return -ENODEV; } 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\n", disk->disk_name); return -ENODEV; } } else { if (zone->len > args->zone_sectors) { pr_warn("%s: Invalid zoned device with larger last zone size\n", disk->disk_name); return -ENODEV; } } /* Check for holes in the zone report */ if (zone->start != args->sector) { pr_warn("%s: Zone gap at sectors %llu..%llu\n", disk->disk_name, args->sector, zone->start); return -ENODEV; } /* Check zone type */ switch (zone->type) { case BLK_ZONE_TYPE_CONVENTIONAL: 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; case BLK_ZONE_TYPE_SEQWRITE_REQ: case BLK_ZONE_TYPE_SEQWRITE_PREF: 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; } break; default: pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n", disk->disk_name, (int)zone->type, zone->start); return -ENODEV; } args->sector += zone->len; return 0; } /** * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps * @disk: Target disk * @update_driver_data: Callback to update driver data on the frozen disk * * Helper function for low-level device drivers to (re) allocate and initialize * a disk request queue zone bitmaps. This functions should normally be called * 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. * 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. */ int blk_revalidate_disk_zones(struct gendisk *disk, void (*update_driver_data)(struct gendisk *disk)) { struct request_queue *q = disk->queue; struct blk_revalidate_zone_args args = { .disk = disk, }; unsigned int noio_flag; int ret; if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) return -EIO; if (WARN_ON_ONCE(!queue_is_mq(q))) return -EIO; if (!get_capacity(disk)) return -EIO; /* * Ensure that all memory allocations in this context are done as if * GFP_NOIO was specified. */ noio_flag = memalloc_noio_save(); ret = disk->fops->report_zones(disk, 0, UINT_MAX, blk_revalidate_zone_cb, &args); memalloc_noio_restore(noio_flag); /* * 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). */ blk_mq_freeze_queue(q); if (ret >= 0) { blk_queue_chunk_sectors(q, args.zone_sectors); q->nr_zones = args.nr_zones; swap(q->seq_zones_wlock, args.seq_zones_wlock); swap(q->conv_zones_bitmap, args.conv_zones_bitmap); if (update_driver_data) update_driver_data(disk); ret = 0; } else { pr_warn("%s: failed to revalidate zones\n", disk->disk_name); blk_queue_free_zone_bitmaps(q); } blk_mq_unfreeze_queue(q); kfree(args.seq_zones_wlock); kfree(args.conv_zones_bitmap); return ret; } EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
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