| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef BLK_INTERNAL_H |
| #define BLK_INTERNAL_H |
| |
| #include <linux/idr.h> |
| #include <linux/blk-mq.h> |
| #include <linux/part_stat.h> |
| #include <linux/blk-crypto.h> |
| #include <xen/xen.h> |
| #include "blk-crypto-internal.h" |
| #include "blk-mq.h" |
| #include "blk-mq-sched.h" |
| |
| /* Max future timer expiry for timeouts */ |
| #define BLK_MAX_TIMEOUT (5 * HZ) |
| |
| #ifdef CONFIG_DEBUG_FS |
| extern struct dentry *blk_debugfs_root; |
| #endif |
| |
| struct blk_flush_queue { |
| unsigned int flush_pending_idx:1; |
| unsigned int flush_running_idx:1; |
| blk_status_t rq_status; |
| unsigned long flush_pending_since; |
| struct list_head flush_queue[2]; |
| struct list_head flush_data_in_flight; |
| struct request *flush_rq; |
| |
| /* |
| * flush_rq shares tag with this rq, both can't be active |
| * at the same time |
| */ |
| struct request *orig_rq; |
| struct lock_class_key key; |
| spinlock_t mq_flush_lock; |
| }; |
| |
| extern struct kmem_cache *blk_requestq_cachep; |
| extern struct kobj_type blk_queue_ktype; |
| extern struct ida blk_queue_ida; |
| |
| static inline struct blk_flush_queue * |
| blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx) |
| { |
| return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq; |
| } |
| |
| static inline void __blk_get_queue(struct request_queue *q) |
| { |
| kobject_get(&q->kobj); |
| } |
| |
| static inline bool |
| is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx) |
| { |
| return hctx->fq->flush_rq == req; |
| } |
| |
| struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size, |
| gfp_t flags); |
| void blk_free_flush_queue(struct blk_flush_queue *q); |
| |
| void blk_freeze_queue(struct request_queue *q); |
| |
| static inline bool biovec_phys_mergeable(struct request_queue *q, |
| struct bio_vec *vec1, struct bio_vec *vec2) |
| { |
| unsigned long mask = queue_segment_boundary(q); |
| phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; |
| phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; |
| |
| if (addr1 + vec1->bv_len != addr2) |
| return false; |
| if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) |
| return false; |
| if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) |
| return false; |
| return true; |
| } |
| |
| static inline bool __bvec_gap_to_prev(struct request_queue *q, |
| struct bio_vec *bprv, unsigned int offset) |
| { |
| return (offset & queue_virt_boundary(q)) || |
| ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
| } |
| |
| /* |
| * Check if adding a bio_vec after bprv with offset would create a gap in |
| * the SG list. Most drivers don't care about this, but some do. |
| */ |
| static inline bool bvec_gap_to_prev(struct request_queue *q, |
| struct bio_vec *bprv, unsigned int offset) |
| { |
| if (!queue_virt_boundary(q)) |
| return false; |
| return __bvec_gap_to_prev(q, bprv, offset); |
| } |
| |
| static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio, |
| unsigned int nr_segs) |
| { |
| rq->nr_phys_segments = nr_segs; |
| rq->__data_len = bio->bi_iter.bi_size; |
| rq->bio = rq->biotail = bio; |
| rq->ioprio = bio_prio(bio); |
| |
| if (bio->bi_disk) |
| rq->rq_disk = bio->bi_disk; |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| void blk_flush_integrity(void); |
| bool __bio_integrity_endio(struct bio *); |
| void bio_integrity_free(struct bio *bio); |
| static inline bool bio_integrity_endio(struct bio *bio) |
| { |
| if (bio_integrity(bio)) |
| return __bio_integrity_endio(bio); |
| return true; |
| } |
| |
| static inline bool integrity_req_gap_back_merge(struct request *req, |
| struct bio *next) |
| { |
| struct bio_integrity_payload *bip = bio_integrity(req->bio); |
| struct bio_integrity_payload *bip_next = bio_integrity(next); |
| |
| return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| bip_next->bip_vec[0].bv_offset); |
| } |
| |
| static inline bool integrity_req_gap_front_merge(struct request *req, |
| struct bio *bio) |
| { |
| struct bio_integrity_payload *bip = bio_integrity(bio); |
| struct bio_integrity_payload *bip_next = bio_integrity(req->bio); |
| |
| return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| bip_next->bip_vec[0].bv_offset); |
| } |
| |
| void blk_integrity_add(struct gendisk *); |
| void blk_integrity_del(struct gendisk *); |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| static inline bool integrity_req_gap_back_merge(struct request *req, |
| struct bio *next) |
| { |
| return false; |
| } |
| static inline bool integrity_req_gap_front_merge(struct request *req, |
| struct bio *bio) |
| { |
| return false; |
| } |
| |
| static inline void blk_flush_integrity(void) |
| { |
| } |
| static inline bool bio_integrity_endio(struct bio *bio) |
| { |
| return true; |
| } |
| static inline void bio_integrity_free(struct bio *bio) |
| { |
| } |
| static inline void blk_integrity_add(struct gendisk *disk) |
| { |
| } |
| static inline void blk_integrity_del(struct gendisk *disk) |
| { |
| } |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| unsigned long blk_rq_timeout(unsigned long timeout); |
| void blk_add_timer(struct request *req); |
| |
| bool bio_attempt_front_merge(struct request *req, struct bio *bio, |
| unsigned int nr_segs); |
| bool bio_attempt_back_merge(struct request *req, struct bio *bio, |
| unsigned int nr_segs); |
| bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, |
| struct bio *bio); |
| bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
| unsigned int nr_segs, struct request **same_queue_rq); |
| |
| void blk_account_io_start(struct request *req); |
| void blk_account_io_done(struct request *req, u64 now); |
| |
| /* |
| * Internal elevator interface |
| */ |
| #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
| |
| void blk_insert_flush(struct request *rq); |
| |
| void elevator_init_mq(struct request_queue *q); |
| int elevator_switch_mq(struct request_queue *q, |
| struct elevator_type *new_e); |
| void __elevator_exit(struct request_queue *, struct elevator_queue *); |
| int elv_register_queue(struct request_queue *q, bool uevent); |
| void elv_unregister_queue(struct request_queue *q); |
| |
| static inline void elevator_exit(struct request_queue *q, |
| struct elevator_queue *e) |
| { |
| lockdep_assert_held(&q->sysfs_lock); |
| |
| blk_mq_sched_free_requests(q); |
| __elevator_exit(q, e); |
| } |
| |
| struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
| |
| ssize_t part_size_show(struct device *dev, struct device_attribute *attr, |
| char *buf); |
| ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, |
| char *buf); |
| ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, |
| char *buf); |
| ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, |
| char *buf); |
| ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count); |
| |
| #ifdef CONFIG_FAIL_IO_TIMEOUT |
| int blk_should_fake_timeout(struct request_queue *); |
| ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); |
| ssize_t part_timeout_store(struct device *, struct device_attribute *, |
| const char *, size_t); |
| #else |
| static inline int blk_should_fake_timeout(struct request_queue *q) |
| { |
| return 0; |
| } |
| #endif |
| |
| void __blk_queue_split(struct request_queue *q, struct bio **bio, |
| unsigned int *nr_segs); |
| int ll_back_merge_fn(struct request *req, struct bio *bio, |
| unsigned int nr_segs); |
| int ll_front_merge_fn(struct request *req, struct bio *bio, |
| unsigned int nr_segs); |
| struct request *attempt_back_merge(struct request_queue *q, struct request *rq); |
| struct request *attempt_front_merge(struct request_queue *q, struct request *rq); |
| int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
| struct request *next); |
| unsigned int blk_recalc_rq_segments(struct request *rq); |
| void blk_rq_set_mixed_merge(struct request *rq); |
| bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
| enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); |
| |
| int blk_dev_init(void); |
| |
| /* |
| * Contribute to IO statistics IFF: |
| * |
| * a) it's attached to a gendisk, and |
| * b) the queue had IO stats enabled when this request was started |
| */ |
| static inline bool blk_do_io_stat(struct request *rq) |
| { |
| return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT); |
| } |
| |
| static inline void req_set_nomerge(struct request_queue *q, struct request *req) |
| { |
| req->cmd_flags |= REQ_NOMERGE; |
| if (req == q->last_merge) |
| q->last_merge = NULL; |
| } |
| |
| /* |
| * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size |
| * is defined as 'unsigned int', meantime it has to aligned to with logical |
| * block size which is the minimum accepted unit by hardware. |
| */ |
| static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) |
| { |
| return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; |
| } |
| |
| /* |
| * Internal io_context interface |
| */ |
| void get_io_context(struct io_context *ioc); |
| struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
| struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
| gfp_t gfp_mask); |
| void ioc_clear_queue(struct request_queue *q); |
| |
| int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
| |
| /* |
| * Internal throttling interface |
| */ |
| #ifdef CONFIG_BLK_DEV_THROTTLING |
| extern int blk_throtl_init(struct request_queue *q); |
| extern void blk_throtl_exit(struct request_queue *q); |
| extern void blk_throtl_register_queue(struct request_queue *q); |
| #else /* CONFIG_BLK_DEV_THROTTLING */ |
| static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
| static inline void blk_throtl_exit(struct request_queue *q) { } |
| static inline void blk_throtl_register_queue(struct request_queue *q) { } |
| #endif /* CONFIG_BLK_DEV_THROTTLING */ |
| #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
| extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page); |
| extern ssize_t blk_throtl_sample_time_store(struct request_queue *q, |
| const char *page, size_t count); |
| extern void blk_throtl_bio_endio(struct bio *bio); |
| extern void blk_throtl_stat_add(struct request *rq, u64 time); |
| #else |
| static inline void blk_throtl_bio_endio(struct bio *bio) { } |
| static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } |
| #endif |
| |
| #ifdef CONFIG_BOUNCE |
| extern int init_emergency_isa_pool(void); |
| extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
| #else |
| static inline int init_emergency_isa_pool(void) |
| { |
| return 0; |
| } |
| static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
| { |
| } |
| #endif /* CONFIG_BOUNCE */ |
| |
| #ifdef CONFIG_BLK_CGROUP_IOLATENCY |
| extern int blk_iolatency_init(struct request_queue *q); |
| #else |
| static inline int blk_iolatency_init(struct request_queue *q) { return 0; } |
| #endif |
| |
| struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| void blk_queue_free_zone_bitmaps(struct request_queue *q); |
| #else |
| static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} |
| #endif |
| |
| struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); |
| |
| int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
| void blk_free_devt(dev_t devt); |
| void blk_invalidate_devt(dev_t devt); |
| char *disk_name(struct gendisk *hd, int partno, char *buf); |
| #define ADDPART_FLAG_NONE 0 |
| #define ADDPART_FLAG_RAID 1 |
| #define ADDPART_FLAG_WHOLEDISK 2 |
| void delete_partition(struct gendisk *disk, struct hd_struct *part); |
| int bdev_add_partition(struct block_device *bdev, int partno, |
| sector_t start, sector_t length); |
| int bdev_del_partition(struct block_device *bdev, int partno); |
| int bdev_resize_partition(struct block_device *bdev, int partno, |
| sector_t start, sector_t length); |
| int disk_expand_part_tbl(struct gendisk *disk, int target); |
| int hd_ref_init(struct hd_struct *part); |
| |
| /* no need to get/put refcount of part0 */ |
| static inline int hd_struct_try_get(struct hd_struct *part) |
| { |
| if (part->partno) |
| return percpu_ref_tryget_live(&part->ref); |
| return 1; |
| } |
| |
| static inline void hd_struct_put(struct hd_struct *part) |
| { |
| if (part->partno) |
| percpu_ref_put(&part->ref); |
| } |
| |
| static inline void hd_free_part(struct hd_struct *part) |
| { |
| free_percpu(part->dkstats); |
| kfree(part->info); |
| percpu_ref_exit(&part->ref); |
| } |
| |
| /* |
| * Any access of part->nr_sects which is not protected by partition |
| * bd_mutex or gendisk bdev bd_mutex, should be done using this |
| * accessor function. |
| * |
| * Code written along the lines of i_size_read() and i_size_write(). |
| * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption |
| * on. |
| */ |
| static inline sector_t part_nr_sects_read(struct hd_struct *part) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| sector_t nr_sects; |
| unsigned seq; |
| do { |
| seq = read_seqcount_begin(&part->nr_sects_seq); |
| nr_sects = part->nr_sects; |
| } while (read_seqcount_retry(&part->nr_sects_seq, seq)); |
| return nr_sects; |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) |
| sector_t nr_sects; |
| |
| preempt_disable(); |
| nr_sects = part->nr_sects; |
| preempt_enable(); |
| return nr_sects; |
| #else |
| return part->nr_sects; |
| #endif |
| } |
| |
| /* |
| * Should be called with mutex lock held (typically bd_mutex) of partition |
| * to provide mutual exlusion among writers otherwise seqcount might be |
| * left in wrong state leaving the readers spinning infinitely. |
| */ |
| static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) |
| { |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| write_seqcount_begin(&part->nr_sects_seq); |
| part->nr_sects = size; |
| write_seqcount_end(&part->nr_sects_seq); |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) |
| preempt_disable(); |
| part->nr_sects = size; |
| preempt_enable(); |
| #else |
| part->nr_sects = size; |
| #endif |
| } |
| |
| struct request_queue *__blk_alloc_queue(int node_id); |
| |
| int bio_add_hw_page(struct request_queue *q, struct bio *bio, |
| struct page *page, unsigned int len, unsigned int offset, |
| unsigned int max_sectors, bool *same_page); |
| |
| #endif /* BLK_INTERNAL_H */ |