497 lines
15 KiB
C
497 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BLK_INTERNAL_H
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#define BLK_INTERNAL_H
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#include <linux/idr.h>
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#include <linux/blk-mq.h>
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#include <linux/part_stat.h>
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#include <linux/blk-crypto.h>
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#include <linux/memblock.h> /* for max_pfn/max_low_pfn */
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#include <xen/xen.h>
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#include "blk-crypto-internal.h"
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#include "blk-mq.h"
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#include "blk-mq-sched.h"
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struct elevator_type;
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/* Max future timer expiry for timeouts */
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#define BLK_MAX_TIMEOUT (5 * HZ)
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extern struct dentry *blk_debugfs_root;
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struct blk_flush_queue {
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unsigned int flush_pending_idx:1;
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unsigned int flush_running_idx:1;
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blk_status_t rq_status;
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unsigned long flush_pending_since;
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struct list_head flush_queue[2];
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struct list_head flush_data_in_flight;
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struct request *flush_rq;
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spinlock_t mq_flush_lock;
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};
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extern struct kmem_cache *blk_requestq_cachep;
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extern struct kobj_type blk_queue_ktype;
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extern struct ida blk_queue_ida;
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static inline struct blk_flush_queue *
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blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
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{
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return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
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}
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static inline void __blk_get_queue(struct request_queue *q)
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{
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kobject_get(&q->kobj);
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}
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bool is_flush_rq(struct request *req);
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struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
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gfp_t flags);
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void blk_free_flush_queue(struct blk_flush_queue *q);
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void blk_freeze_queue(struct request_queue *q);
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void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
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void blk_queue_start_drain(struct request_queue *q);
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int __bio_queue_enter(struct request_queue *q, struct bio *bio);
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bool submit_bio_checks(struct bio *bio);
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static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
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{
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rcu_read_lock();
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if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
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goto fail;
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/*
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* The code that increments the pm_only counter must ensure that the
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* counter is globally visible before the queue is unfrozen.
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*/
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if (blk_queue_pm_only(q) &&
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(!pm || queue_rpm_status(q) == RPM_SUSPENDED))
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goto fail_put;
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rcu_read_unlock();
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return true;
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fail_put:
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blk_queue_exit(q);
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fail:
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rcu_read_unlock();
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return false;
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}
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static inline int bio_queue_enter(struct bio *bio)
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{
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struct request_queue *q = bdev_get_queue(bio->bi_bdev);
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if (blk_try_enter_queue(q, false))
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return 0;
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return __bio_queue_enter(q, bio);
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}
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#define BIO_INLINE_VECS 4
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struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
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gfp_t gfp_mask);
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void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs);
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static inline bool biovec_phys_mergeable(struct request_queue *q,
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struct bio_vec *vec1, struct bio_vec *vec2)
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{
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unsigned long mask = queue_segment_boundary(q);
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phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
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phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
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if (addr1 + vec1->bv_len != addr2)
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return false;
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if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
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return false;
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if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
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return false;
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return true;
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}
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static inline bool __bvec_gap_to_prev(struct request_queue *q,
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struct bio_vec *bprv, unsigned int offset)
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{
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return (offset & queue_virt_boundary(q)) ||
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((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
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}
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/*
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* Check if adding a bio_vec after bprv with offset would create a gap in
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* the SG list. Most drivers don't care about this, but some do.
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*/
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static inline bool bvec_gap_to_prev(struct request_queue *q,
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struct bio_vec *bprv, unsigned int offset)
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{
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if (!queue_virt_boundary(q))
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return false;
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return __bvec_gap_to_prev(q, bprv, offset);
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}
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static inline bool rq_mergeable(struct request *rq)
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{
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if (blk_rq_is_passthrough(rq))
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return false;
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if (req_op(rq) == REQ_OP_FLUSH)
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return false;
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if (req_op(rq) == REQ_OP_WRITE_ZEROES)
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return false;
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if (req_op(rq) == REQ_OP_ZONE_APPEND)
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return false;
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if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
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return false;
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if (rq->rq_flags & RQF_NOMERGE_FLAGS)
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return false;
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return true;
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}
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/*
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* There are two different ways to handle DISCARD merges:
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* 1) If max_discard_segments > 1, the driver treats every bio as a range and
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* send the bios to controller together. The ranges don't need to be
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* contiguous.
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* 2) Otherwise, the request will be normal read/write requests. The ranges
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* need to be contiguous.
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*/
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static inline bool blk_discard_mergable(struct request *req)
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{
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if (req_op(req) == REQ_OP_DISCARD &&
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queue_max_discard_segments(req->q) > 1)
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return true;
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return false;
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}
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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void blk_flush_integrity(void);
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bool __bio_integrity_endio(struct bio *);
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void bio_integrity_free(struct bio *bio);
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static inline bool bio_integrity_endio(struct bio *bio)
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{
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if (bio_integrity(bio))
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return __bio_integrity_endio(bio);
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return true;
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}
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bool blk_integrity_merge_rq(struct request_queue *, struct request *,
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struct request *);
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bool blk_integrity_merge_bio(struct request_queue *, struct request *,
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struct bio *);
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static inline bool integrity_req_gap_back_merge(struct request *req,
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struct bio *next)
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{
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struct bio_integrity_payload *bip = bio_integrity(req->bio);
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struct bio_integrity_payload *bip_next = bio_integrity(next);
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return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
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bip_next->bip_vec[0].bv_offset);
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}
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static inline bool integrity_req_gap_front_merge(struct request *req,
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struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
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return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
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bip_next->bip_vec[0].bv_offset);
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}
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int blk_integrity_add(struct gendisk *disk);
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void blk_integrity_del(struct gendisk *);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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static inline bool blk_integrity_merge_rq(struct request_queue *rq,
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struct request *r1, struct request *r2)
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{
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return true;
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}
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static inline bool blk_integrity_merge_bio(struct request_queue *rq,
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struct request *r, struct bio *b)
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{
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return true;
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}
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static inline bool integrity_req_gap_back_merge(struct request *req,
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struct bio *next)
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{
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return false;
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}
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static inline bool integrity_req_gap_front_merge(struct request *req,
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struct bio *bio)
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{
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return false;
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}
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static inline void blk_flush_integrity(void)
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{
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}
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static inline bool bio_integrity_endio(struct bio *bio)
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{
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return true;
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}
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static inline void bio_integrity_free(struct bio *bio)
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{
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}
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static inline int blk_integrity_add(struct gendisk *disk)
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{
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return 0;
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}
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static inline void blk_integrity_del(struct gendisk *disk)
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{
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}
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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unsigned long blk_rq_timeout(unsigned long timeout);
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void blk_add_timer(struct request *req);
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void blk_print_req_error(struct request *req, blk_status_t status);
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bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
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unsigned int nr_segs, bool *same_queue_rq);
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bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
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struct bio *bio, unsigned int nr_segs);
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void __blk_account_io_start(struct request *req);
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void __blk_account_io_done(struct request *req, u64 now);
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/*
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* Plug flush limits
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*/
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#define BLK_MAX_REQUEST_COUNT 32
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#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
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/*
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* Internal elevator interface
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*/
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#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
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bool blk_insert_flush(struct request *rq);
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int elevator_switch_mq(struct request_queue *q,
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struct elevator_type *new_e);
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void __elevator_exit(struct request_queue *, struct elevator_queue *);
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int elv_register_queue(struct request_queue *q, bool uevent);
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void elv_unregister_queue(struct request_queue *q);
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static inline void elevator_exit(struct request_queue *q,
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struct elevator_queue *e)
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{
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lockdep_assert_held(&q->sysfs_lock);
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blk_mq_sched_free_rqs(q);
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__elevator_exit(q, e);
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}
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ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
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ssize_t part_timeout_store(struct device *, struct device_attribute *,
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const char *, size_t);
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static inline bool blk_may_split(struct request_queue *q, struct bio *bio)
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{
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switch (bio_op(bio)) {
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case REQ_OP_DISCARD:
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case REQ_OP_SECURE_ERASE:
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE_SAME:
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return true; /* non-trivial splitting decisions */
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default:
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break;
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}
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/*
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* All drivers must accept single-segments bios that are <= PAGE_SIZE.
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* This is a quick and dirty check that relies on the fact that
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* bi_io_vec[0] is always valid if a bio has data. The check might
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* lead to occasional false negatives when bios are cloned, but compared
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* to the performance impact of cloned bios themselves the loop below
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* doesn't matter anyway.
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*/
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return q->limits.chunk_sectors || bio->bi_vcnt != 1 ||
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bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE;
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}
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void __blk_queue_split(struct request_queue *q, struct bio **bio,
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unsigned int *nr_segs);
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int ll_back_merge_fn(struct request *req, struct bio *bio,
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unsigned int nr_segs);
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bool blk_attempt_req_merge(struct request_queue *q, struct request *rq,
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struct request *next);
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unsigned int blk_recalc_rq_segments(struct request *rq);
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void blk_rq_set_mixed_merge(struct request *rq);
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bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
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enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
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int blk_dev_init(void);
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/*
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* Contribute to IO statistics IFF:
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*
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* a) it's attached to a gendisk, and
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* b) the queue had IO stats enabled when this request was started
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*/
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static inline bool blk_do_io_stat(struct request *rq)
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{
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return (rq->rq_flags & RQF_IO_STAT) && rq->rq_disk;
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}
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static inline void blk_account_io_done(struct request *req, u64 now)
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{
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/*
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* Account IO completion. flush_rq isn't accounted as a
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* normal IO on queueing nor completion. Accounting the
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* containing request is enough.
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*/
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if (blk_do_io_stat(req) && req->part &&
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!(req->rq_flags & RQF_FLUSH_SEQ))
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__blk_account_io_done(req, now);
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}
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static inline void blk_account_io_start(struct request *req)
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{
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if (blk_do_io_stat(req))
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__blk_account_io_start(req);
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}
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static inline void req_set_nomerge(struct request_queue *q, struct request *req)
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{
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req->cmd_flags |= REQ_NOMERGE;
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if (req == q->last_merge)
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q->last_merge = NULL;
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}
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/*
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* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
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* is defined as 'unsigned int', meantime it has to aligned to with logical
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* block size which is the minimum accepted unit by hardware.
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*/
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static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
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{
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return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
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}
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/*
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* The max bio size which is aligned to q->limits.discard_granularity. This
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* is a hint to split large discard bio in generic block layer, then if device
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* driver needs to split the discard bio into smaller ones, their bi_size can
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* be very probably and easily aligned to discard_granularity of the device's
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* queue.
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*/
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static inline unsigned int bio_aligned_discard_max_sectors(
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struct request_queue *q)
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{
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return round_down(UINT_MAX, q->limits.discard_granularity) >>
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SECTOR_SHIFT;
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}
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/*
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* Internal io_context interface
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*/
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void get_io_context(struct io_context *ioc);
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struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
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struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
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gfp_t gfp_mask);
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void ioc_clear_queue(struct request_queue *q);
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int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
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#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
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extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
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extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
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const char *page, size_t count);
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extern void blk_throtl_bio_endio(struct bio *bio);
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extern void blk_throtl_stat_add(struct request *rq, u64 time);
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#else
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static inline void blk_throtl_bio_endio(struct bio *bio) { }
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static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
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#endif
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void __blk_queue_bounce(struct request_queue *q, struct bio **bio);
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static inline bool blk_queue_may_bounce(struct request_queue *q)
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{
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return IS_ENABLED(CONFIG_BOUNCE) &&
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q->limits.bounce == BLK_BOUNCE_HIGH &&
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max_low_pfn >= max_pfn;
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}
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static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
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{
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if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
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__blk_queue_bounce(q, bio);
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}
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#ifdef CONFIG_BLK_CGROUP_IOLATENCY
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extern int blk_iolatency_init(struct request_queue *q);
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#else
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static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
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#endif
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struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
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#ifdef CONFIG_BLK_DEV_ZONED
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void blk_queue_free_zone_bitmaps(struct request_queue *q);
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void blk_queue_clear_zone_settings(struct request_queue *q);
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#else
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static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
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static inline void blk_queue_clear_zone_settings(struct request_queue *q) {}
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#endif
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int blk_alloc_ext_minor(void);
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void blk_free_ext_minor(unsigned int minor);
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#define ADDPART_FLAG_NONE 0
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#define ADDPART_FLAG_RAID 1
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#define ADDPART_FLAG_WHOLEDISK 2
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int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
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sector_t length);
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int bdev_del_partition(struct gendisk *disk, int partno);
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int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
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sector_t length);
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int bio_add_hw_page(struct request_queue *q, struct bio *bio,
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struct page *page, unsigned int len, unsigned int offset,
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unsigned int max_sectors, bool *same_page);
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struct request_queue *blk_alloc_queue(int node_id);
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int disk_alloc_events(struct gendisk *disk);
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void disk_add_events(struct gendisk *disk);
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void disk_del_events(struct gendisk *disk);
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void disk_release_events(struct gendisk *disk);
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extern struct device_attribute dev_attr_events;
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extern struct device_attribute dev_attr_events_async;
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extern struct device_attribute dev_attr_events_poll_msecs;
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static inline void bio_clear_polled(struct bio *bio)
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{
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/* can't support alloc cache if we turn off polling */
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bio_clear_flag(bio, BIO_PERCPU_CACHE);
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bio->bi_opf &= ~REQ_POLLED;
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}
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long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
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long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
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extern const struct address_space_operations def_blk_aops;
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int disk_register_independent_access_ranges(struct gendisk *disk,
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struct blk_independent_access_ranges *new_iars);
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void disk_unregister_independent_access_ranges(struct gendisk *disk);
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#endif /* BLK_INTERNAL_H */
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