diff options
Diffstat (limited to 'block/blk.h')
-rw-r--r-- | block/blk.h | 499 |
1 files changed, 344 insertions, 155 deletions
diff --git a/block/blk.h b/block/blk.h index 7814aa207153..b0dbbc405596 100644 --- a/block/blk.h +++ b/block/blk.h @@ -2,70 +2,84 @@ #ifndef BLK_INTERNAL_H #define BLK_INTERNAL_H -#include <linux/idr.h> -#include <linux/blk-mq.h> +#include <linux/blk-crypto.h> +#include <linux/memblock.h> /* for max_pfn/max_low_pfn */ #include <xen/xen.h> -#include "blk-mq.h" -#include "blk-mq-sched.h" +#include "blk-crypto-internal.h" + +struct elevator_type; /* 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_queue_delayed:1; 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; 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); -} +bool is_flush_rq(struct request *req); -struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, - int node, int cmd_size, gfp_t flags); +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_rq_bio_prep(struct request_queue *q, struct request *rq, - struct bio *bio); void blk_freeze_queue(struct request_queue *q); +void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic); +void blk_queue_start_drain(struct request_queue *q); +int __bio_queue_enter(struct request_queue *q, struct bio *bio); +void submit_bio_noacct_nocheck(struct bio *bio); -static inline void blk_queue_enter_live(struct request_queue *q) +static inline bool blk_try_enter_queue(struct request_queue *q, bool pm) { + rcu_read_lock(); + if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter)) + goto fail; + /* - * Given that running in generic_make_request() context - * guarantees that a live reference against q_usage_counter has - * been established, further references under that same context - * need not check that the queue has been frozen (marked dead). + * The code that increments the pm_only counter must ensure that the + * counter is globally visible before the queue is unfrozen. */ - percpu_ref_get(&q->q_usage_counter); + if (blk_queue_pm_only(q) && + (!pm || queue_rpm_status(q) == RPM_SUSPENDED)) + goto fail_put; + + rcu_read_unlock(); + return true; + +fail_put: + blk_queue_exit(q); +fail: + rcu_read_unlock(); + return false; } +static inline int bio_queue_enter(struct bio *bio) +{ + struct request_queue *q = bdev_get_queue(bio->bi_bdev); + + if (blk_try_enter_queue(q, false)) + return 0; + return __bio_queue_enter(q, bio); +} + +#define BIO_INLINE_VECS 4 +struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs, + gfp_t gfp_mask); +void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs); + +bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv, + struct page *page, unsigned len, unsigned offset, + bool *same_page); + static inline bool biovec_phys_mergeable(struct request_queue *q, struct bio_vec *vec1, struct bio_vec *vec2) { @@ -73,6 +87,13 @@ static inline bool biovec_phys_mergeable(struct request_queue *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; + /* + * Merging adjacent physical pages may not work correctly under KMSAN + * if their metadata pages aren't adjacent. Just disable merging. + */ + if (IS_ENABLED(CONFIG_KMSAN)) + return false; + if (addr1 + vec1->bv_len != addr2) return false; if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) @@ -82,28 +103,87 @@ static inline bool biovec_phys_mergeable(struct request_queue *q, return true; } -static inline bool __bvec_gap_to_prev(struct request_queue *q, +static inline bool __bvec_gap_to_prev(const struct queue_limits *lim, struct bio_vec *bprv, unsigned int offset) { - return (offset & queue_virt_boundary(q)) || - ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); + return (offset & lim->virt_boundary_mask) || + ((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask); } /* * 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, +static inline bool bvec_gap_to_prev(const struct queue_limits *lim, struct bio_vec *bprv, unsigned int offset) { - if (!queue_virt_boundary(q)) + if (!lim->virt_boundary_mask) return false; - return __bvec_gap_to_prev(q, bprv, offset); + return __bvec_gap_to_prev(lim, bprv, offset); +} + +static inline bool rq_mergeable(struct request *rq) +{ + if (blk_rq_is_passthrough(rq)) + return false; + + if (req_op(rq) == REQ_OP_FLUSH) + return false; + + if (req_op(rq) == REQ_OP_WRITE_ZEROES) + return false; + + if (req_op(rq) == REQ_OP_ZONE_APPEND) + return false; + + if (rq->cmd_flags & REQ_NOMERGE_FLAGS) + return false; + if (rq->rq_flags & RQF_NOMERGE_FLAGS) + return false; + + return true; +} + +/* + * There are two different ways to handle DISCARD merges: + * 1) If max_discard_segments > 1, the driver treats every bio as a range and + * send the bios to controller together. The ranges don't need to be + * contiguous. + * 2) Otherwise, the request will be normal read/write requests. The ranges + * need to be contiguous. + */ +static inline bool blk_discard_mergable(struct request *req) +{ + if (req_op(req) == REQ_OP_DISCARD && + queue_max_discard_segments(req->q) > 1) + return true; + return false; +} + +static inline unsigned int blk_rq_get_max_segments(struct request *rq) +{ + if (req_op(rq) == REQ_OP_DISCARD) + return queue_max_discard_segments(rq->q); + return queue_max_segments(rq->q); +} + +static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, + enum req_op op) +{ + if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) + return min(q->limits.max_discard_sectors, + UINT_MAX >> SECTOR_SHIFT); + + if (unlikely(op == REQ_OP_WRITE_ZEROES)) + return q->limits.max_write_zeroes_sectors; + + return q->limits.max_sectors; } #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)) @@ -111,13 +191,19 @@ static inline bool bio_integrity_endio(struct bio *bio) return true; } +bool blk_integrity_merge_rq(struct request_queue *, struct request *, + struct request *); +bool blk_integrity_merge_bio(struct request_queue *, struct request *, + struct bio *); + 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], + return bvec_gap_to_prev(&req->q->limits, + &bip->bip_vec[bip->bip_vcnt - 1], bip_next->bip_vec[0].bv_offset); } @@ -127,10 +213,23 @@ static inline bool integrity_req_gap_front_merge(struct request *req, 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], + return bvec_gap_to_prev(&req->q->limits, + &bip->bip_vec[bip->bip_vcnt - 1], bip_next->bip_vec[0].bv_offset); } + +extern const struct attribute_group blk_integrity_attr_group; #else /* CONFIG_BLK_DEV_INTEGRITY */ +static inline bool blk_integrity_merge_rq(struct request_queue *rq, + struct request *r1, struct request *r2) +{ + return true; +} +static inline bool blk_integrity_merge_bio(struct request_queue *rq, + struct request *r, struct bio *b) +{ + return true; +} static inline bool integrity_req_gap_back_merge(struct request *req, struct bio *next) { @@ -149,88 +248,105 @@ static inline bool bio_integrity_endio(struct bio *bio) { return true; } +static inline void bio_integrity_free(struct bio *bio) +{ +} #endif /* CONFIG_BLK_DEV_INTEGRITY */ unsigned long blk_rq_timeout(unsigned long timeout); void blk_add_timer(struct request *req); +const char *blk_status_to_str(blk_status_t status); -bool bio_attempt_front_merge(struct request_queue *q, struct request *req, - struct bio *bio); -bool bio_attempt_back_merge(struct request_queue *q, struct request *req, - struct bio *bio); -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, - struct request **same_queue_rq); + unsigned int nr_segs); +bool blk_bio_list_merge(struct request_queue *q, struct list_head *list, + struct bio *bio, unsigned int nr_segs); -void blk_account_io_start(struct request *req, bool new_io); -void blk_account_io_completion(struct request *req, unsigned int bytes); -void blk_account_io_done(struct request *req, u64 now); +/* + * Plug flush limits + */ +#define BLK_MAX_REQUEST_COUNT 32 +#define BLK_PLUG_FLUSH_SIZE (128 * 1024) /* * Internal elevator interface */ #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) -void blk_insert_flush(struct request *rq); +bool blk_insert_flush(struct request *rq); -int 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); +int elevator_switch(struct request_queue *q, struct elevator_type *new_e); +void elevator_disable(struct request_queue *q); +void elevator_exit(struct request_queue *q); +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) -{ - blk_mq_sched_free_requests(q); - __elevator_exit(q, e); -} - -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); - -#ifdef CONFIG_FAIL_IO_TIMEOUT -int blk_should_fake_timeout(struct request_queue *); +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); 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) + +static inline bool bio_may_exceed_limits(struct bio *bio, + const struct queue_limits *lim) { - return 0; + switch (bio_op(bio)) { + case REQ_OP_DISCARD: + case REQ_OP_SECURE_ERASE: + case REQ_OP_WRITE_ZEROES: + return true; /* non-trivial splitting decisions */ + default: + break; + } + + /* + * All drivers must accept single-segments bios that are <= PAGE_SIZE. + * This is a quick and dirty check that relies on the fact that + * bi_io_vec[0] is always valid if a bio has data. The check might + * lead to occasional false negatives when bios are cloned, but compared + * to the performance impact of cloned bios themselves the loop below + * doesn't matter anyway. + */ + return lim->chunk_sectors || bio->bi_vcnt != 1 || + bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE; } -#endif -int ll_back_merge_fn(struct request_queue *q, struct request *req, - struct bio *bio); -int ll_front_merge_fn(struct request_queue *q, struct request *req, - struct bio *bio); -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 bio *__bio_split_to_limits(struct bio *bio, + const struct queue_limits *lim, + unsigned int *nr_segs); +int ll_back_merge_fn(struct request *req, struct bio *bio, + unsigned int nr_segs); +bool blk_attempt_req_merge(struct request_queue *q, struct request *rq, struct request *next); -void blk_recalc_rq_segments(struct request *rq); +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); +void blk_set_default_limits(struct queue_limits *lim); 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, and - * c) it's a file system request + * 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) && - !blk_rq_is_passthrough(rq); + return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq); } +void update_io_ticks(struct block_device *part, unsigned long now, bool end); + static inline void req_set_nomerge(struct request_queue *q, struct request *req) { req->cmd_flags |= REQ_NOMERGE; @@ -239,60 +355,18 @@ static inline void req_set_nomerge(struct request_queue *q, struct request *req) } /* - * 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); +struct io_cq *ioc_find_get_icq(struct request_queue *q); +struct io_cq *ioc_lookup_icq(struct request_queue *q); +#ifdef CONFIG_BLK_ICQ void ioc_clear_queue(struct request_queue *q); - -int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); - -/** - * create_io_context - try to create task->io_context - * @gfp_mask: allocation mask - * @node: allocation node - * - * If %current->io_context is %NULL, allocate a new io_context and install - * it. Returns the current %current->io_context which may be %NULL if - * allocation failed. - * - * Note that this function can't be called with IRQ disabled because - * task_lock which protects %current->io_context is IRQ-unsafe. - */ -static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) +#else +static inline void ioc_clear_queue(struct request_queue *q) { - WARN_ON_ONCE(irqs_disabled()); - if (unlikely(!current->io_context)) - create_task_io_context(current, gfp_mask, node); - return current->io_context; } +#endif /* CONFIG_BLK_ICQ */ -/* - * Internal throttling interface - */ -#ifdef CONFIG_BLK_DEV_THROTTLING -extern void blk_throtl_drain(struct request_queue *q); -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 void blk_throtl_drain(struct request_queue *q) { } -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, @@ -304,31 +378,146 @@ 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) +struct bio *__blk_queue_bounce(struct bio *bio, struct request_queue *q); + +static inline bool blk_queue_may_bounce(struct request_queue *q) { - return 0; + return IS_ENABLED(CONFIG_BOUNCE) && + q->limits.bounce == BLK_BOUNCE_HIGH && + max_low_pfn >= max_pfn; } -static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) + +static inline struct bio *blk_queue_bounce(struct bio *bio, + struct request_queue *q) { + if (unlikely(blk_queue_may_bounce(q) && bio_has_data(bio))) + return __blk_queue_bounce(bio, q); + return 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 +#ifdef CONFIG_BLK_DEV_ZONED +void disk_free_zone_bitmaps(struct gendisk *disk); +void disk_clear_zone_settings(struct gendisk *disk); +int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, + unsigned long arg); +int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg); +#else /* CONFIG_BLK_DEV_ZONED */ +static inline void disk_free_zone_bitmaps(struct gendisk *disk) {} +static inline void disk_clear_zone_settings(struct gendisk *disk) {} +static inline int blkdev_report_zones_ioctl(struct block_device *bdev, + unsigned int cmd, unsigned long arg) +{ + return -ENOTTY; +} +static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, + blk_mode_t mode, unsigned int cmd, unsigned long arg) +{ + return -ENOTTY; +} +#endif /* CONFIG_BLK_DEV_ZONED */ -struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); +struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); +void bdev_add(struct block_device *bdev, dev_t dev); -#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 +int blk_alloc_ext_minor(void); +void blk_free_ext_minor(unsigned int minor); +#define ADDPART_FLAG_NONE 0 +#define ADDPART_FLAG_RAID 1 +#define ADDPART_FLAG_WHOLEDISK 2 +int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, + sector_t length); +int bdev_del_partition(struct gendisk *disk, int partno); +int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start, + sector_t length); +void drop_partition(struct block_device *part); + +void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors); + +struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, + struct lock_class_key *lkclass); + +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); + +/* + * Clean up a page appropriately, where the page may be pinned, may have a + * ref taken on it or neither. + */ +static inline void bio_release_page(struct bio *bio, struct page *page) +{ + if (bio_flagged(bio, BIO_PAGE_PINNED)) + unpin_user_page(page); +} + +struct request_queue *blk_alloc_queue(int node_id); + +int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode); + +int disk_alloc_events(struct gendisk *disk); +void disk_add_events(struct gendisk *disk); +void disk_del_events(struct gendisk *disk); +void disk_release_events(struct gendisk *disk); +void disk_block_events(struct gendisk *disk); +void disk_unblock_events(struct gendisk *disk); +void disk_flush_events(struct gendisk *disk, unsigned int mask); +extern struct device_attribute dev_attr_events; +extern struct device_attribute dev_attr_events_async; +extern struct device_attribute dev_attr_events_poll_msecs; + +extern struct attribute_group blk_trace_attr_group; + +blk_mode_t file_to_blk_mode(struct file *file); +int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode, + loff_t lstart, loff_t lend); +long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); +long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); + +extern const struct address_space_operations def_blk_aops; + +int disk_register_independent_access_ranges(struct gendisk *disk); +void disk_unregister_independent_access_ranges(struct gendisk *disk); + +#ifdef CONFIG_FAIL_MAKE_REQUEST +bool should_fail_request(struct block_device *part, unsigned int bytes); +#else /* CONFIG_FAIL_MAKE_REQUEST */ +static inline bool should_fail_request(struct block_device *part, + unsigned int bytes) +{ + return false; +} +#endif /* CONFIG_FAIL_MAKE_REQUEST */ + +/* + * Optimized request reference counting. Ideally we'd make timeouts be more + * clever, as that's the only reason we need references at all... But until + * this happens, this is faster than using refcount_t. Also see: + * + * abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count") + */ +#define req_ref_zero_or_close_to_overflow(req) \ + ((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u) + +static inline bool req_ref_inc_not_zero(struct request *req) +{ + return atomic_inc_not_zero(&req->ref); +} + +static inline bool req_ref_put_and_test(struct request *req) +{ + WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); + return atomic_dec_and_test(&req->ref); +} + +static inline void req_ref_set(struct request *req, int value) +{ + atomic_set(&req->ref, value); +} + +static inline int req_ref_read(struct request *req) +{ + return atomic_read(&req->ref); +} #endif /* BLK_INTERNAL_H */ |