dc4d137ee3
Add support for user space to set a max open zone and a max active zone limit via configfs. By default, the default values are 0 == no limit. Call the block layer API functions used for exposing the configured limits to sysfs. Add accounting in null_blk_zoned so that these new limits are respected. Performing an operation that would exceed these limits results in a standard I/O error. A max open zone limit exists in the ZBC standard. While null_blk_zoned is used to test the Zoned Block Device model in Linux, when it comes to differences between ZBC and ZNS, null_blk_zoned mostly follows ZBC. Therefore, implement the manage open zone resources function from ZBC, but additionally add support for max active zones. This enables user space not only to test against a device with an open zone limit, but also to test against a device with an active zone limit. Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __BLK_NULL_BLK_H
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#define __BLK_NULL_BLK_H
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#undef pr_fmt
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/blk-mq.h>
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#include <linux/hrtimer.h>
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#include <linux/configfs.h>
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#include <linux/badblocks.h>
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#include <linux/fault-inject.h>
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struct nullb_cmd {
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struct request *rq;
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struct bio *bio;
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unsigned int tag;
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blk_status_t error;
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struct nullb_queue *nq;
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struct hrtimer timer;
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};
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struct nullb_queue {
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unsigned long *tag_map;
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wait_queue_head_t wait;
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unsigned int queue_depth;
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struct nullb_device *dev;
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unsigned int requeue_selection;
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struct nullb_cmd *cmds;
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};
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struct nullb_device {
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struct nullb *nullb;
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struct config_item item;
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struct radix_tree_root data; /* data stored in the disk */
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struct radix_tree_root cache; /* disk cache data */
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unsigned long flags; /* device flags */
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unsigned int curr_cache;
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struct badblocks badblocks;
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unsigned int nr_zones;
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unsigned int nr_zones_imp_open;
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unsigned int nr_zones_exp_open;
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unsigned int nr_zones_closed;
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struct blk_zone *zones;
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sector_t zone_size_sects;
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unsigned long size; /* device size in MB */
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unsigned long completion_nsec; /* time in ns to complete a request */
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unsigned long cache_size; /* disk cache size in MB */
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unsigned long zone_size; /* zone size in MB if device is zoned */
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unsigned long zone_capacity; /* zone capacity in MB if device is zoned */
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unsigned int zone_nr_conv; /* number of conventional zones */
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unsigned int zone_max_open; /* max number of open zones */
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unsigned int zone_max_active; /* max number of active zones */
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unsigned int submit_queues; /* number of submission queues */
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unsigned int home_node; /* home node for the device */
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unsigned int queue_mode; /* block interface */
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unsigned int blocksize; /* block size */
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unsigned int irqmode; /* IRQ completion handler */
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unsigned int hw_queue_depth; /* queue depth */
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unsigned int index; /* index of the disk, only valid with a disk */
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unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
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bool blocking; /* blocking blk-mq device */
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bool use_per_node_hctx; /* use per-node allocation for hardware context */
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bool power; /* power on/off the device */
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bool memory_backed; /* if data is stored in memory */
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bool discard; /* if support discard */
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bool zoned; /* if device is zoned */
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};
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struct nullb {
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struct nullb_device *dev;
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struct list_head list;
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unsigned int index;
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struct request_queue *q;
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struct gendisk *disk;
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struct blk_mq_tag_set *tag_set;
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struct blk_mq_tag_set __tag_set;
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unsigned int queue_depth;
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atomic_long_t cur_bytes;
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struct hrtimer bw_timer;
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unsigned long cache_flush_pos;
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spinlock_t lock;
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struct nullb_queue *queues;
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unsigned int nr_queues;
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char disk_name[DISK_NAME_LEN];
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};
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blk_status_t null_process_cmd(struct nullb_cmd *cmd,
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enum req_opf op, sector_t sector,
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unsigned int nr_sectors);
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#ifdef CONFIG_BLK_DEV_ZONED
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int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q);
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int null_register_zoned_dev(struct nullb *nullb);
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void null_free_zoned_dev(struct nullb_device *dev);
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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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blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
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enum req_opf op, sector_t sector,
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sector_t nr_sectors);
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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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#else
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static inline int null_init_zoned_dev(struct nullb_device *dev,
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struct request_queue *q)
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{
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pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");
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return -EINVAL;
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}
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static inline int null_register_zoned_dev(struct nullb *nullb)
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{
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return -ENODEV;
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}
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static inline void null_free_zoned_dev(struct nullb_device *dev) {}
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static inline blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
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enum req_opf op, sector_t sector, sector_t nr_sectors)
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{
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return BLK_STS_NOTSUPP;
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}
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static inline size_t null_zone_valid_read_len(struct nullb *nullb,
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sector_t sector,
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unsigned int len)
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{
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return len;
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}
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#define null_report_zones NULL
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#endif /* CONFIG_BLK_DEV_ZONED */
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#endif /* __NULL_BLK_H */
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