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TOMOYO Linux Cross Reference
Linux/block/blk.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef BLK_INTERNAL_H
  3 #define BLK_INTERNAL_H
  4 
  5 #include <linux/idr.h>
  6 #include <linux/blk-mq.h>
  7 #include <xen/xen.h>
  8 #include "blk-mq.h"
  9 #include "blk-mq-sched.h"
 10 
 11 /* Max future timer expiry for timeouts */
 12 #define BLK_MAX_TIMEOUT         (5 * HZ)
 13 
 14 #ifdef CONFIG_DEBUG_FS
 15 extern struct dentry *blk_debugfs_root;
 16 #endif
 17 
 18 struct blk_flush_queue {
 19         unsigned int            flush_queue_delayed:1;
 20         unsigned int            flush_pending_idx:1;
 21         unsigned int            flush_running_idx:1;
 22         blk_status_t            rq_status;
 23         unsigned long           flush_pending_since;
 24         struct list_head        flush_queue[2];
 25         struct list_head        flush_data_in_flight;
 26         struct request          *flush_rq;
 27 
 28         /*
 29          * flush_rq shares tag with this rq, both can't be active
 30          * at the same time
 31          */
 32         struct request          *orig_rq;
 33         spinlock_t              mq_flush_lock;
 34 };
 35 
 36 extern struct kmem_cache *blk_requestq_cachep;
 37 extern struct kobj_type blk_queue_ktype;
 38 extern struct ida blk_queue_ida;
 39 
 40 static inline struct blk_flush_queue *
 41 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
 42 {
 43         return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
 44 }
 45 
 46 static inline void __blk_get_queue(struct request_queue *q)
 47 {
 48         kobject_get(&q->kobj);
 49 }
 50 
 51 static inline bool
 52 is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
 53 {
 54         return hctx->fq->flush_rq == req;
 55 }
 56 
 57 struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
 58                 int node, int cmd_size, gfp_t flags);
 59 void blk_free_flush_queue(struct blk_flush_queue *q);
 60 
 61 void blk_freeze_queue(struct request_queue *q);
 62 
 63 static inline void blk_queue_enter_live(struct request_queue *q)
 64 {
 65         /*
 66          * Given that running in generic_make_request() context
 67          * guarantees that a live reference against q_usage_counter has
 68          * been established, further references under that same context
 69          * need not check that the queue has been frozen (marked dead).
 70          */
 71         percpu_ref_get(&q->q_usage_counter);
 72 }
 73 
 74 static inline bool biovec_phys_mergeable(struct request_queue *q,
 75                 struct bio_vec *vec1, struct bio_vec *vec2)
 76 {
 77         unsigned long mask = queue_segment_boundary(q);
 78         phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
 79         phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
 80 
 81         if (addr1 + vec1->bv_len != addr2)
 82                 return false;
 83         if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
 84                 return false;
 85         if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
 86                 return false;
 87         return true;
 88 }
 89 
 90 static inline bool __bvec_gap_to_prev(struct request_queue *q,
 91                 struct bio_vec *bprv, unsigned int offset)
 92 {
 93         return (offset & queue_virt_boundary(q)) ||
 94                 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
 95 }
 96 
 97 /*
 98  * Check if adding a bio_vec after bprv with offset would create a gap in
 99  * the SG list. Most drivers don't care about this, but some do.
100  */
101 static inline bool bvec_gap_to_prev(struct request_queue *q,
102                 struct bio_vec *bprv, unsigned int offset)
103 {
104         if (!queue_virt_boundary(q))
105                 return false;
106         return __bvec_gap_to_prev(q, bprv, offset);
107 }
108 
109 static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
110                 unsigned int nr_segs)
111 {
112         rq->nr_phys_segments = nr_segs;
113         rq->__data_len = bio->bi_iter.bi_size;
114         rq->bio = rq->biotail = bio;
115         rq->ioprio = bio_prio(bio);
116 
117         if (bio->bi_disk)
118                 rq->rq_disk = bio->bi_disk;
119 }
120 
121 #ifdef CONFIG_BLK_DEV_INTEGRITY
122 void blk_flush_integrity(void);
123 bool __bio_integrity_endio(struct bio *);
124 static inline bool bio_integrity_endio(struct bio *bio)
125 {
126         if (bio_integrity(bio))
127                 return __bio_integrity_endio(bio);
128         return true;
129 }
130 
131 static inline bool integrity_req_gap_back_merge(struct request *req,
132                 struct bio *next)
133 {
134         struct bio_integrity_payload *bip = bio_integrity(req->bio);
135         struct bio_integrity_payload *bip_next = bio_integrity(next);
136 
137         return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
138                                 bip_next->bip_vec[0].bv_offset);
139 }
140 
141 static inline bool integrity_req_gap_front_merge(struct request *req,
142                 struct bio *bio)
143 {
144         struct bio_integrity_payload *bip = bio_integrity(bio);
145         struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
146 
147         return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
148                                 bip_next->bip_vec[0].bv_offset);
149 }
150 #else /* CONFIG_BLK_DEV_INTEGRITY */
151 static inline bool integrity_req_gap_back_merge(struct request *req,
152                 struct bio *next)
153 {
154         return false;
155 }
156 static inline bool integrity_req_gap_front_merge(struct request *req,
157                 struct bio *bio)
158 {
159         return false;
160 }
161 
162 static inline void blk_flush_integrity(void)
163 {
164 }
165 static inline bool bio_integrity_endio(struct bio *bio)
166 {
167         return true;
168 }
169 #endif /* CONFIG_BLK_DEV_INTEGRITY */
170 
171 unsigned long blk_rq_timeout(unsigned long timeout);
172 void blk_add_timer(struct request *req);
173 
174 bool bio_attempt_front_merge(struct request *req, struct bio *bio,
175                 unsigned int nr_segs);
176 bool bio_attempt_back_merge(struct request *req, struct bio *bio,
177                 unsigned int nr_segs);
178 bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
179                 struct bio *bio);
180 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
181                 unsigned int nr_segs, struct request **same_queue_rq);
182 
183 void blk_account_io_start(struct request *req, bool new_io);
184 void blk_account_io_completion(struct request *req, unsigned int bytes);
185 void blk_account_io_done(struct request *req, u64 now);
186 
187 /*
188  * Internal elevator interface
189  */
190 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
191 
192 void blk_insert_flush(struct request *rq);
193 
194 int elevator_init_mq(struct request_queue *q);
195 int elevator_switch_mq(struct request_queue *q,
196                               struct elevator_type *new_e);
197 void __elevator_exit(struct request_queue *, struct elevator_queue *);
198 int elv_register_queue(struct request_queue *q);
199 void elv_unregister_queue(struct request_queue *q);
200 
201 static inline void elevator_exit(struct request_queue *q,
202                 struct elevator_queue *e)
203 {
204         lockdep_assert_held(&q->sysfs_lock);
205 
206         blk_mq_sched_free_requests(q);
207         __elevator_exit(q, e);
208 }
209 
210 struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
211 
212 #ifdef CONFIG_FAIL_IO_TIMEOUT
213 int blk_should_fake_timeout(struct request_queue *);
214 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
215 ssize_t part_timeout_store(struct device *, struct device_attribute *,
216                                 const char *, size_t);
217 #else
218 static inline int blk_should_fake_timeout(struct request_queue *q)
219 {
220         return 0;
221 }
222 #endif
223 
224 void __blk_queue_split(struct request_queue *q, struct bio **bio,
225                 unsigned int *nr_segs);
226 int ll_back_merge_fn(struct request *req, struct bio *bio,
227                 unsigned int nr_segs);
228 int ll_front_merge_fn(struct request *req,  struct bio *bio,
229                 unsigned int nr_segs);
230 struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
231 struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
232 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
233                                 struct request *next);
234 unsigned int blk_recalc_rq_segments(struct request *rq);
235 void blk_rq_set_mixed_merge(struct request *rq);
236 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
237 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
238 
239 int blk_dev_init(void);
240 
241 /*
242  * Contribute to IO statistics IFF:
243  *
244  *      a) it's attached to a gendisk, and
245  *      b) the queue had IO stats enabled when this request was started, and
246  *      c) it's a file system request
247  */
248 static inline bool blk_do_io_stat(struct request *rq)
249 {
250         return rq->rq_disk &&
251                (rq->rq_flags & RQF_IO_STAT) &&
252                 !blk_rq_is_passthrough(rq);
253 }
254 
255 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
256 {
257         req->cmd_flags |= REQ_NOMERGE;
258         if (req == q->last_merge)
259                 q->last_merge = NULL;
260 }
261 
262 /*
263  * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
264  * is defined as 'unsigned int', meantime it has to aligned to with logical
265  * block size which is the minimum accepted unit by hardware.
266  */
267 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
268 {
269         return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
270 }
271 
272 /*
273  * Internal io_context interface
274  */
275 void get_io_context(struct io_context *ioc);
276 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
277 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
278                              gfp_t gfp_mask);
279 void ioc_clear_queue(struct request_queue *q);
280 
281 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
282 
283 /**
284  * create_io_context - try to create task->io_context
285  * @gfp_mask: allocation mask
286  * @node: allocation node
287  *
288  * If %current->io_context is %NULL, allocate a new io_context and install
289  * it.  Returns the current %current->io_context which may be %NULL if
290  * allocation failed.
291  *
292  * Note that this function can't be called with IRQ disabled because
293  * task_lock which protects %current->io_context is IRQ-unsafe.
294  */
295 static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
296 {
297         WARN_ON_ONCE(irqs_disabled());
298         if (unlikely(!current->io_context))
299                 create_task_io_context(current, gfp_mask, node);
300         return current->io_context;
301 }
302 
303 /*
304  * Internal throttling interface
305  */
306 #ifdef CONFIG_BLK_DEV_THROTTLING
307 extern void blk_throtl_drain(struct request_queue *q);
308 extern int blk_throtl_init(struct request_queue *q);
309 extern void blk_throtl_exit(struct request_queue *q);
310 extern void blk_throtl_register_queue(struct request_queue *q);
311 #else /* CONFIG_BLK_DEV_THROTTLING */
312 static inline void blk_throtl_drain(struct request_queue *q) { }
313 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
314 static inline void blk_throtl_exit(struct request_queue *q) { }
315 static inline void blk_throtl_register_queue(struct request_queue *q) { }
316 #endif /* CONFIG_BLK_DEV_THROTTLING */
317 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
318 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
319 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
320         const char *page, size_t count);
321 extern void blk_throtl_bio_endio(struct bio *bio);
322 extern void blk_throtl_stat_add(struct request *rq, u64 time);
323 #else
324 static inline void blk_throtl_bio_endio(struct bio *bio) { }
325 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
326 #endif
327 
328 #ifdef CONFIG_BOUNCE
329 extern int init_emergency_isa_pool(void);
330 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
331 #else
332 static inline int init_emergency_isa_pool(void)
333 {
334         return 0;
335 }
336 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
337 {
338 }
339 #endif /* CONFIG_BOUNCE */
340 
341 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
342 extern int blk_iolatency_init(struct request_queue *q);
343 #else
344 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
345 #endif
346 
347 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
348 
349 #ifdef CONFIG_BLK_DEV_ZONED
350 void blk_queue_free_zone_bitmaps(struct request_queue *q);
351 #else
352 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
353 #endif
354 
355 #endif /* BLK_INTERNAL_H */
356 

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