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1#ifndef BLK_INTERNAL_H
2#define BLK_INTERNAL_H
3
4#include <linux/idr.h>
5#include <linux/blk-mq.h>
6#include "blk-mq.h"
7
8/* Amount of time in which a process may batch requests */
9#define BLK_BATCH_TIME (HZ/50UL)
10
11/* Number of requests a "batching" process may submit */
12#define BLK_BATCH_REQ 32
13
14/* Max future timer expiry for timeouts */
15#define BLK_MAX_TIMEOUT (5 * HZ)
16
17struct blk_flush_queue {
18 unsigned int flush_queue_delayed:1;
19 unsigned int flush_pending_idx:1;
20 unsigned int flush_running_idx:1;
21 unsigned long flush_pending_since;
22 struct list_head flush_queue[2];
23 struct list_head flush_data_in_flight;
24 struct request *flush_rq;
25
26 /*
27 * flush_rq shares tag with this rq, both can't be active
28 * at the same time
29 */
30 struct request *orig_rq;
31 spinlock_t mq_flush_lock;
32};
33
34extern struct kmem_cache *blk_requestq_cachep;
35extern struct kmem_cache *request_cachep;
36extern struct kobj_type blk_queue_ktype;
37extern struct ida blk_queue_ida;
38
39static inline struct blk_flush_queue *blk_get_flush_queue(
40 struct request_queue *q, struct blk_mq_ctx *ctx)
41{
42 struct blk_mq_hw_ctx *hctx;
43
44 if (!q->mq_ops)
45 return q->fq;
46
47 hctx = q->mq_ops->map_queue(q, ctx->cpu);
48
49 return hctx->fq;
50}
51
52static inline void __blk_get_queue(struct request_queue *q)
53{
54 kobject_get(&q->kobj);
55}
56
57struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
58 int node, int cmd_size);
59void blk_free_flush_queue(struct blk_flush_queue *q);
60
61int blk_init_rl(struct request_list *rl, struct request_queue *q,
62 gfp_t gfp_mask);
63void blk_exit_rl(struct request_list *rl);
64void init_request_from_bio(struct request *req, struct bio *bio);
65void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
66 struct bio *bio);
67int blk_rq_append_bio(struct request_queue *q, struct request *rq,
68 struct bio *bio);
69void blk_queue_bypass_start(struct request_queue *q);
70void blk_queue_bypass_end(struct request_queue *q);
71void blk_dequeue_request(struct request *rq);
72void __blk_queue_free_tags(struct request_queue *q);
73bool __blk_end_bidi_request(struct request *rq, int error,
74 unsigned int nr_bytes, unsigned int bidi_bytes);
75void blk_freeze_queue(struct request_queue *q);
76
77static inline void blk_queue_enter_live(struct request_queue *q)
78{
79 /*
80 * Given that running in generic_make_request() context
81 * guarantees that a live reference against q_usage_counter has
82 * been established, further references under that same context
83 * need not check that the queue has been frozen (marked dead).
84 */
85 percpu_ref_get(&q->q_usage_counter);
86}
87
88#ifdef CONFIG_BLK_DEV_INTEGRITY
89void blk_flush_integrity(void);
90#else
91static inline void blk_flush_integrity(void)
92{
93}
94#endif
95
96void blk_timeout_work(struct work_struct *work);
97unsigned long blk_rq_timeout(unsigned long timeout);
98void blk_add_timer(struct request *req);
99void blk_delete_timer(struct request *);
100
101
102bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
103 struct bio *bio);
104bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
105 struct bio *bio);
106bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
107 unsigned int *request_count,
108 struct request **same_queue_rq);
109unsigned int blk_plug_queued_count(struct request_queue *q);
110
111void blk_account_io_start(struct request *req, bool new_io);
112void blk_account_io_completion(struct request *req, unsigned int bytes);
113void blk_account_io_done(struct request *req);
114
115/*
116 * Internal atomic flags for request handling
117 */
118enum rq_atomic_flags {
119 REQ_ATOM_COMPLETE = 0,
120 REQ_ATOM_STARTED,
121};
122
123/*
124 * EH timer and IO completion will both attempt to 'grab' the request, make
125 * sure that only one of them succeeds
126 */
127static inline int blk_mark_rq_complete(struct request *rq)
128{
129 return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
130}
131
132static inline void blk_clear_rq_complete(struct request *rq)
133{
134 clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
135}
136
137/*
138 * Internal elevator interface
139 */
140#define ELV_ON_HASH(rq) ((rq)->cmd_flags & REQ_HASHED)
141
142void blk_insert_flush(struct request *rq);
143
144static inline struct request *__elv_next_request(struct request_queue *q)
145{
146 struct request *rq;
147 struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);
148
149 while (1) {
150 if (!list_empty(&q->queue_head)) {
151 rq = list_entry_rq(q->queue_head.next);
152 return rq;
153 }
154
155 /*
156 * Flush request is running and flush request isn't queueable
157 * in the drive, we can hold the queue till flush request is
158 * finished. Even we don't do this, driver can't dispatch next
159 * requests and will requeue them. And this can improve
160 * throughput too. For example, we have request flush1, write1,
161 * flush 2. flush1 is dispatched, then queue is hold, write1
162 * isn't inserted to queue. After flush1 is finished, flush2
163 * will be dispatched. Since disk cache is already clean,
164 * flush2 will be finished very soon, so looks like flush2 is
165 * folded to flush1.
166 * Since the queue is hold, a flag is set to indicate the queue
167 * should be restarted later. Please see flush_end_io() for
168 * details.
169 */
170 if (fq->flush_pending_idx != fq->flush_running_idx &&
171 !queue_flush_queueable(q)) {
172 fq->flush_queue_delayed = 1;
173 return NULL;
174 }
175 if (unlikely(blk_queue_bypass(q)) ||
176 !q->elevator->type->ops.elevator_dispatch_fn(q, 0))
177 return NULL;
178 }
179}
180
181static inline void elv_activate_rq(struct request_queue *q, struct request *rq)
182{
183 struct elevator_queue *e = q->elevator;
184
185 if (e->type->ops.elevator_activate_req_fn)
186 e->type->ops.elevator_activate_req_fn(q, rq);
187}
188
189static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq)
190{
191 struct elevator_queue *e = q->elevator;
192
193 if (e->type->ops.elevator_deactivate_req_fn)
194 e->type->ops.elevator_deactivate_req_fn(q, rq);
195}
196
197#ifdef CONFIG_FAIL_IO_TIMEOUT
198int blk_should_fake_timeout(struct request_queue *);
199ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
200ssize_t part_timeout_store(struct device *, struct device_attribute *,
201 const char *, size_t);
202#else
203static inline int blk_should_fake_timeout(struct request_queue *q)
204{
205 return 0;
206}
207#endif
208
209int ll_back_merge_fn(struct request_queue *q, struct request *req,
210 struct bio *bio);
211int ll_front_merge_fn(struct request_queue *q, struct request *req,
212 struct bio *bio);
213int attempt_back_merge(struct request_queue *q, struct request *rq);
214int attempt_front_merge(struct request_queue *q, struct request *rq);
215int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
216 struct request *next);
217void blk_recalc_rq_segments(struct request *rq);
218void blk_rq_set_mixed_merge(struct request *rq);
219bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
220int blk_try_merge(struct request *rq, struct bio *bio);
221
222void blk_queue_congestion_threshold(struct request_queue *q);
223
224int blk_dev_init(void);
225
226
227/*
228 * Return the threshold (number of used requests) at which the queue is
229 * considered to be congested. It include a little hysteresis to keep the
230 * context switch rate down.
231 */
232static inline int queue_congestion_on_threshold(struct request_queue *q)
233{
234 return q->nr_congestion_on;
235}
236
237/*
238 * The threshold at which a queue is considered to be uncongested
239 */
240static inline int queue_congestion_off_threshold(struct request_queue *q)
241{
242 return q->nr_congestion_off;
243}
244
245extern int blk_update_nr_requests(struct request_queue *, unsigned int);
246
247/*
248 * Contribute to IO statistics IFF:
249 *
250 * a) it's attached to a gendisk, and
251 * b) the queue had IO stats enabled when this request was started, and
252 * c) it's a file system request
253 */
254static inline int blk_do_io_stat(struct request *rq)
255{
256 return rq->rq_disk &&
257 (rq->cmd_flags & REQ_IO_STAT) &&
258 (rq->cmd_type == REQ_TYPE_FS);
259}
260
261/*
262 * Internal io_context interface
263 */
264void get_io_context(struct io_context *ioc);
265struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
266struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
267 gfp_t gfp_mask);
268void ioc_clear_queue(struct request_queue *q);
269
270int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
271
272/**
273 * create_io_context - try to create task->io_context
274 * @gfp_mask: allocation mask
275 * @node: allocation node
276 *
277 * If %current->io_context is %NULL, allocate a new io_context and install
278 * it. Returns the current %current->io_context which may be %NULL if
279 * allocation failed.
280 *
281 * Note that this function can't be called with IRQ disabled because
282 * task_lock which protects %current->io_context is IRQ-unsafe.
283 */
284static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
285{
286 WARN_ON_ONCE(irqs_disabled());
287 if (unlikely(!current->io_context))
288 create_task_io_context(current, gfp_mask, node);
289 return current->io_context;
290}
291
292/*
293 * Internal throttling interface
294 */
295#ifdef CONFIG_BLK_DEV_THROTTLING
296extern void blk_throtl_drain(struct request_queue *q);
297extern int blk_throtl_init(struct request_queue *q);
298extern void blk_throtl_exit(struct request_queue *q);
299#else /* CONFIG_BLK_DEV_THROTTLING */
300static inline void blk_throtl_drain(struct request_queue *q) { }
301static inline int blk_throtl_init(struct request_queue *q) { return 0; }
302static inline void blk_throtl_exit(struct request_queue *q) { }
303#endif /* CONFIG_BLK_DEV_THROTTLING */
304
305#endif /* BLK_INTERNAL_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef BLK_INTERNAL_H
3#define BLK_INTERNAL_H
4
5#include <linux/blk-crypto.h>
6#include <linux/memblock.h> /* for max_pfn/max_low_pfn */
7#include <linux/sched/sysctl.h>
8#include <linux/timekeeping.h>
9#include <xen/xen.h>
10#include "blk-crypto-internal.h"
11
12struct elevator_type;
13
14/* Max future timer expiry for timeouts */
15#define BLK_MAX_TIMEOUT (5 * HZ)
16
17extern struct dentry *blk_debugfs_root;
18
19struct blk_flush_queue {
20 spinlock_t mq_flush_lock;
21 unsigned int flush_pending_idx:1;
22 unsigned int flush_running_idx:1;
23 blk_status_t rq_status;
24 unsigned long flush_pending_since;
25 struct list_head flush_queue[2];
26 unsigned long flush_data_in_flight;
27 struct request *flush_rq;
28};
29
30bool is_flush_rq(struct request *req);
31
32struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
33 gfp_t flags);
34void blk_free_flush_queue(struct blk_flush_queue *q);
35
36void blk_freeze_queue(struct request_queue *q);
37void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
38void blk_queue_start_drain(struct request_queue *q);
39int __bio_queue_enter(struct request_queue *q, struct bio *bio);
40void submit_bio_noacct_nocheck(struct bio *bio);
41
42static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
43{
44 rcu_read_lock();
45 if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
46 goto fail;
47
48 /*
49 * The code that increments the pm_only counter must ensure that the
50 * counter is globally visible before the queue is unfrozen.
51 */
52 if (blk_queue_pm_only(q) &&
53 (!pm || queue_rpm_status(q) == RPM_SUSPENDED))
54 goto fail_put;
55
56 rcu_read_unlock();
57 return true;
58
59fail_put:
60 blk_queue_exit(q);
61fail:
62 rcu_read_unlock();
63 return false;
64}
65
66static inline int bio_queue_enter(struct bio *bio)
67{
68 struct request_queue *q = bdev_get_queue(bio->bi_bdev);
69
70 if (blk_try_enter_queue(q, false))
71 return 0;
72 return __bio_queue_enter(q, bio);
73}
74
75static inline void blk_wait_io(struct completion *done)
76{
77 /* Prevent hang_check timer from firing at us during very long I/O */
78 unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
79
80 if (timeout)
81 while (!wait_for_completion_io_timeout(done, timeout))
82 ;
83 else
84 wait_for_completion_io(done);
85}
86
87#define BIO_INLINE_VECS 4
88struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
89 gfp_t gfp_mask);
90void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs);
91
92bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
93 struct page *page, unsigned len, unsigned offset,
94 bool *same_page);
95
96static inline bool biovec_phys_mergeable(struct request_queue *q,
97 struct bio_vec *vec1, struct bio_vec *vec2)
98{
99 unsigned long mask = queue_segment_boundary(q);
100 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
101 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
102
103 /*
104 * Merging adjacent physical pages may not work correctly under KMSAN
105 * if their metadata pages aren't adjacent. Just disable merging.
106 */
107 if (IS_ENABLED(CONFIG_KMSAN))
108 return false;
109
110 if (addr1 + vec1->bv_len != addr2)
111 return false;
112 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
113 return false;
114 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
115 return false;
116 return true;
117}
118
119static inline bool __bvec_gap_to_prev(const struct queue_limits *lim,
120 struct bio_vec *bprv, unsigned int offset)
121{
122 return (offset & lim->virt_boundary_mask) ||
123 ((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask);
124}
125
126/*
127 * Check if adding a bio_vec after bprv with offset would create a gap in
128 * the SG list. Most drivers don't care about this, but some do.
129 */
130static inline bool bvec_gap_to_prev(const struct queue_limits *lim,
131 struct bio_vec *bprv, unsigned int offset)
132{
133 if (!lim->virt_boundary_mask)
134 return false;
135 return __bvec_gap_to_prev(lim, bprv, offset);
136}
137
138static inline bool rq_mergeable(struct request *rq)
139{
140 if (blk_rq_is_passthrough(rq))
141 return false;
142
143 if (req_op(rq) == REQ_OP_FLUSH)
144 return false;
145
146 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
147 return false;
148
149 if (req_op(rq) == REQ_OP_ZONE_APPEND)
150 return false;
151
152 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
153 return false;
154 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
155 return false;
156
157 return true;
158}
159
160/*
161 * There are two different ways to handle DISCARD merges:
162 * 1) If max_discard_segments > 1, the driver treats every bio as a range and
163 * send the bios to controller together. The ranges don't need to be
164 * contiguous.
165 * 2) Otherwise, the request will be normal read/write requests. The ranges
166 * need to be contiguous.
167 */
168static inline bool blk_discard_mergable(struct request *req)
169{
170 if (req_op(req) == REQ_OP_DISCARD &&
171 queue_max_discard_segments(req->q) > 1)
172 return true;
173 return false;
174}
175
176static inline unsigned int blk_rq_get_max_segments(struct request *rq)
177{
178 if (req_op(rq) == REQ_OP_DISCARD)
179 return queue_max_discard_segments(rq->q);
180 return queue_max_segments(rq->q);
181}
182
183static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
184 enum req_op op)
185{
186 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
187 return min(q->limits.max_discard_sectors,
188 UINT_MAX >> SECTOR_SHIFT);
189
190 if (unlikely(op == REQ_OP_WRITE_ZEROES))
191 return q->limits.max_write_zeroes_sectors;
192
193 return q->limits.max_sectors;
194}
195
196#ifdef CONFIG_BLK_DEV_INTEGRITY
197void blk_flush_integrity(void);
198bool __bio_integrity_endio(struct bio *);
199void bio_integrity_free(struct bio *bio);
200static inline bool bio_integrity_endio(struct bio *bio)
201{
202 if (bio_integrity(bio))
203 return __bio_integrity_endio(bio);
204 return true;
205}
206
207bool blk_integrity_merge_rq(struct request_queue *, struct request *,
208 struct request *);
209bool blk_integrity_merge_bio(struct request_queue *, struct request *,
210 struct bio *);
211
212static inline bool integrity_req_gap_back_merge(struct request *req,
213 struct bio *next)
214{
215 struct bio_integrity_payload *bip = bio_integrity(req->bio);
216 struct bio_integrity_payload *bip_next = bio_integrity(next);
217
218 return bvec_gap_to_prev(&req->q->limits,
219 &bip->bip_vec[bip->bip_vcnt - 1],
220 bip_next->bip_vec[0].bv_offset);
221}
222
223static inline bool integrity_req_gap_front_merge(struct request *req,
224 struct bio *bio)
225{
226 struct bio_integrity_payload *bip = bio_integrity(bio);
227 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
228
229 return bvec_gap_to_prev(&req->q->limits,
230 &bip->bip_vec[bip->bip_vcnt - 1],
231 bip_next->bip_vec[0].bv_offset);
232}
233
234extern const struct attribute_group blk_integrity_attr_group;
235#else /* CONFIG_BLK_DEV_INTEGRITY */
236static inline bool blk_integrity_merge_rq(struct request_queue *rq,
237 struct request *r1, struct request *r2)
238{
239 return true;
240}
241static inline bool blk_integrity_merge_bio(struct request_queue *rq,
242 struct request *r, struct bio *b)
243{
244 return true;
245}
246static inline bool integrity_req_gap_back_merge(struct request *req,
247 struct bio *next)
248{
249 return false;
250}
251static inline bool integrity_req_gap_front_merge(struct request *req,
252 struct bio *bio)
253{
254 return false;
255}
256
257static inline void blk_flush_integrity(void)
258{
259}
260static inline bool bio_integrity_endio(struct bio *bio)
261{
262 return true;
263}
264static inline void bio_integrity_free(struct bio *bio)
265{
266}
267#endif /* CONFIG_BLK_DEV_INTEGRITY */
268
269unsigned long blk_rq_timeout(unsigned long timeout);
270void blk_add_timer(struct request *req);
271
272bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
273 unsigned int nr_segs);
274bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
275 struct bio *bio, unsigned int nr_segs);
276
277/*
278 * Plug flush limits
279 */
280#define BLK_MAX_REQUEST_COUNT 32
281#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
282
283/*
284 * Internal elevator interface
285 */
286#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
287
288bool blk_insert_flush(struct request *rq);
289
290int elevator_switch(struct request_queue *q, struct elevator_type *new_e);
291void elevator_disable(struct request_queue *q);
292void elevator_exit(struct request_queue *q);
293int elv_register_queue(struct request_queue *q, bool uevent);
294void elv_unregister_queue(struct request_queue *q);
295
296ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
297 char *buf);
298ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
299 char *buf);
300ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
301 char *buf);
302ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
303 char *buf);
304ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count);
306ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
307ssize_t part_timeout_store(struct device *, struct device_attribute *,
308 const char *, size_t);
309
310static inline bool bio_may_exceed_limits(struct bio *bio,
311 const struct queue_limits *lim)
312{
313 switch (bio_op(bio)) {
314 case REQ_OP_DISCARD:
315 case REQ_OP_SECURE_ERASE:
316 case REQ_OP_WRITE_ZEROES:
317 return true; /* non-trivial splitting decisions */
318 default:
319 break;
320 }
321
322 /*
323 * All drivers must accept single-segments bios that are <= PAGE_SIZE.
324 * This is a quick and dirty check that relies on the fact that
325 * bi_io_vec[0] is always valid if a bio has data. The check might
326 * lead to occasional false negatives when bios are cloned, but compared
327 * to the performance impact of cloned bios themselves the loop below
328 * doesn't matter anyway.
329 */
330 return lim->chunk_sectors || bio->bi_vcnt != 1 ||
331 bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE;
332}
333
334struct bio *__bio_split_to_limits(struct bio *bio,
335 const struct queue_limits *lim,
336 unsigned int *nr_segs);
337int ll_back_merge_fn(struct request *req, struct bio *bio,
338 unsigned int nr_segs);
339bool blk_attempt_req_merge(struct request_queue *q, struct request *rq,
340 struct request *next);
341unsigned int blk_recalc_rq_segments(struct request *rq);
342bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
343enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
344
345int blk_set_default_limits(struct queue_limits *lim);
346int blk_dev_init(void);
347
348/*
349 * Contribute to IO statistics IFF:
350 *
351 * a) it's attached to a gendisk, and
352 * b) the queue had IO stats enabled when this request was started
353 */
354static inline bool blk_do_io_stat(struct request *rq)
355{
356 return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq);
357}
358
359void update_io_ticks(struct block_device *part, unsigned long now, bool end);
360unsigned int part_in_flight(struct block_device *part);
361
362static inline void req_set_nomerge(struct request_queue *q, struct request *req)
363{
364 req->cmd_flags |= REQ_NOMERGE;
365 if (req == q->last_merge)
366 q->last_merge = NULL;
367}
368
369/*
370 * Internal io_context interface
371 */
372struct io_cq *ioc_find_get_icq(struct request_queue *q);
373struct io_cq *ioc_lookup_icq(struct request_queue *q);
374#ifdef CONFIG_BLK_ICQ
375void ioc_clear_queue(struct request_queue *q);
376#else
377static inline void ioc_clear_queue(struct request_queue *q)
378{
379}
380#endif /* CONFIG_BLK_ICQ */
381
382#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
383extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
384extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
385 const char *page, size_t count);
386extern void blk_throtl_bio_endio(struct bio *bio);
387extern void blk_throtl_stat_add(struct request *rq, u64 time);
388#else
389static inline void blk_throtl_bio_endio(struct bio *bio) { }
390static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
391#endif
392
393struct bio *__blk_queue_bounce(struct bio *bio, struct request_queue *q);
394
395static inline bool blk_queue_may_bounce(struct request_queue *q)
396{
397 return IS_ENABLED(CONFIG_BOUNCE) &&
398 q->limits.bounce == BLK_BOUNCE_HIGH &&
399 max_low_pfn >= max_pfn;
400}
401
402static inline struct bio *blk_queue_bounce(struct bio *bio,
403 struct request_queue *q)
404{
405 if (unlikely(blk_queue_may_bounce(q) && bio_has_data(bio)))
406 return __blk_queue_bounce(bio, q);
407 return bio;
408}
409
410#ifdef CONFIG_BLK_DEV_ZONED
411void disk_free_zone_bitmaps(struct gendisk *disk);
412int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd,
413 unsigned long arg);
414int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode,
415 unsigned int cmd, unsigned long arg);
416#else /* CONFIG_BLK_DEV_ZONED */
417static inline void disk_free_zone_bitmaps(struct gendisk *disk) {}
418static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
419 unsigned int cmd, unsigned long arg)
420{
421 return -ENOTTY;
422}
423static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
424 blk_mode_t mode, unsigned int cmd, unsigned long arg)
425{
426 return -ENOTTY;
427}
428#endif /* CONFIG_BLK_DEV_ZONED */
429
430struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
431void bdev_add(struct block_device *bdev, dev_t dev);
432
433int blk_alloc_ext_minor(void);
434void blk_free_ext_minor(unsigned int minor);
435#define ADDPART_FLAG_NONE 0
436#define ADDPART_FLAG_RAID 1
437#define ADDPART_FLAG_WHOLEDISK 2
438int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
439 sector_t length);
440int bdev_del_partition(struct gendisk *disk, int partno);
441int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
442 sector_t length);
443void drop_partition(struct block_device *part);
444
445void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors);
446
447struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
448 struct lock_class_key *lkclass);
449
450int bio_add_hw_page(struct request_queue *q, struct bio *bio,
451 struct page *page, unsigned int len, unsigned int offset,
452 unsigned int max_sectors, bool *same_page);
453
454/*
455 * Clean up a page appropriately, where the page may be pinned, may have a
456 * ref taken on it or neither.
457 */
458static inline void bio_release_page(struct bio *bio, struct page *page)
459{
460 if (bio_flagged(bio, BIO_PAGE_PINNED))
461 unpin_user_page(page);
462}
463
464struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id);
465
466int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode);
467
468int disk_alloc_events(struct gendisk *disk);
469void disk_add_events(struct gendisk *disk);
470void disk_del_events(struct gendisk *disk);
471void disk_release_events(struct gendisk *disk);
472void disk_block_events(struct gendisk *disk);
473void disk_unblock_events(struct gendisk *disk);
474void disk_flush_events(struct gendisk *disk, unsigned int mask);
475extern struct device_attribute dev_attr_events;
476extern struct device_attribute dev_attr_events_async;
477extern struct device_attribute dev_attr_events_poll_msecs;
478
479extern struct attribute_group blk_trace_attr_group;
480
481blk_mode_t file_to_blk_mode(struct file *file);
482int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode,
483 loff_t lstart, loff_t lend);
484long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
485long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
486
487extern const struct address_space_operations def_blk_aops;
488
489int disk_register_independent_access_ranges(struct gendisk *disk);
490void disk_unregister_independent_access_ranges(struct gendisk *disk);
491
492#ifdef CONFIG_FAIL_MAKE_REQUEST
493bool should_fail_request(struct block_device *part, unsigned int bytes);
494#else /* CONFIG_FAIL_MAKE_REQUEST */
495static inline bool should_fail_request(struct block_device *part,
496 unsigned int bytes)
497{
498 return false;
499}
500#endif /* CONFIG_FAIL_MAKE_REQUEST */
501
502/*
503 * Optimized request reference counting. Ideally we'd make timeouts be more
504 * clever, as that's the only reason we need references at all... But until
505 * this happens, this is faster than using refcount_t. Also see:
506 *
507 * abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count")
508 */
509#define req_ref_zero_or_close_to_overflow(req) \
510 ((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u)
511
512static inline bool req_ref_inc_not_zero(struct request *req)
513{
514 return atomic_inc_not_zero(&req->ref);
515}
516
517static inline bool req_ref_put_and_test(struct request *req)
518{
519 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
520 return atomic_dec_and_test(&req->ref);
521}
522
523static inline void req_ref_set(struct request *req, int value)
524{
525 atomic_set(&req->ref, value);
526}
527
528static inline int req_ref_read(struct request *req)
529{
530 return atomic_read(&req->ref);
531}
532
533static inline u64 blk_time_get_ns(void)
534{
535 struct blk_plug *plug = current->plug;
536
537 if (!plug || !in_task())
538 return ktime_get_ns();
539
540 /*
541 * 0 could very well be a valid time, but rather than flag "this is
542 * a valid timestamp" separately, just accept that we'll do an extra
543 * ktime_get_ns() if we just happen to get 0 as the current time.
544 */
545 if (!plug->cur_ktime) {
546 plug->cur_ktime = ktime_get_ns();
547 current->flags |= PF_BLOCK_TS;
548 }
549 return plug->cur_ktime;
550}
551
552static inline ktime_t blk_time_get(void)
553{
554 return ns_to_ktime(blk_time_get_ns());
555}
556
557/*
558 * From most significant bit:
559 * 1 bit: reserved for other usage, see below
560 * 12 bits: original size of bio
561 * 51 bits: issue time of bio
562 */
563#define BIO_ISSUE_RES_BITS 1
564#define BIO_ISSUE_SIZE_BITS 12
565#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS)
566#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
567#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
568#define BIO_ISSUE_SIZE_MASK \
569 (((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
570#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))
571
572/* Reserved bit for blk-throtl */
573#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)
574
575static inline u64 __bio_issue_time(u64 time)
576{
577 return time & BIO_ISSUE_TIME_MASK;
578}
579
580static inline u64 bio_issue_time(struct bio_issue *issue)
581{
582 return __bio_issue_time(issue->value);
583}
584
585static inline sector_t bio_issue_size(struct bio_issue *issue)
586{
587 return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
588}
589
590static inline void bio_issue_init(struct bio_issue *issue,
591 sector_t size)
592{
593 size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
594 issue->value = ((issue->value & BIO_ISSUE_RES_MASK) |
595 (blk_time_get_ns() & BIO_ISSUE_TIME_MASK) |
596 ((u64)size << BIO_ISSUE_SIZE_SHIFT));
597}
598
599void bdev_release(struct file *bdev_file);
600int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
601 const struct blk_holder_ops *hops, struct file *bdev_file);
602int bdev_permission(dev_t dev, blk_mode_t mode, void *holder);
603
604#endif /* BLK_INTERNAL_H */