~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/block/blk.h

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_rq_bio_prep(struct request_queue *q, struct request *rq,
 62                         struct bio *bio);
 63 void blk_freeze_queue(struct request_queue *q);
 64 
 65 static inline void blk_queue_enter_live(struct request_queue *q)
 66 {
 67         /*
 68          * Given that running in generic_make_request() context
 69          * guarantees that a live reference against q_usage_counter has
 70          * been established, further references under that same context
 71          * need not check that the queue has been frozen (marked dead).
 72          */
 73         percpu_ref_get(&q->q_usage_counter);
 74 }
 75 
 76 static inline bool biovec_phys_mergeable(struct request_queue *q,
 77                 struct bio_vec *vec1, struct bio_vec *vec2)
 78 {
 79         unsigned long mask = queue_segment_boundary(q);
 80         phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
 81         phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
 82 
 83         if (addr1 + vec1->bv_len != addr2)
 84                 return false;
 85         if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
 86                 return false;
 87         if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
 88                 return false;
 89         return true;
 90 }
 91 
 92 static inline bool __bvec_gap_to_prev(struct request_queue *q,
 93                 struct bio_vec *bprv, unsigned int offset)
 94 {
 95         return (offset & queue_virt_boundary(q)) ||
 96                 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
 97 }
 98 
 99 /*
100  * Check if adding a bio_vec after bprv with offset would create a gap in
101  * the SG list. Most drivers don't care about this, but some do.
102  */
103 static inline bool bvec_gap_to_prev(struct request_queue *q,
104                 struct bio_vec *bprv, unsigned int offset)
105 {
106         if (!queue_virt_boundary(q))
107                 return false;
108         return __bvec_gap_to_prev(q, bprv, offset);
109 }
110 
111 #ifdef CONFIG_BLK_DEV_INTEGRITY
112 void blk_flush_integrity(void);
113 bool __bio_integrity_endio(struct bio *);
114 static inline bool bio_integrity_endio(struct bio *bio)
115 {
116         if (bio_integrity(bio))
117                 return __bio_integrity_endio(bio);
118         return true;
119 }
120 
121 static inline bool integrity_req_gap_back_merge(struct request *req,
122                 struct bio *next)
123 {
124         struct bio_integrity_payload *bip = bio_integrity(req->bio);
125         struct bio_integrity_payload *bip_next = bio_integrity(next);
126 
127         return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
128                                 bip_next->bip_vec[0].bv_offset);
129 }
130 
131 static inline bool integrity_req_gap_front_merge(struct request *req,
132                 struct bio *bio)
133 {
134         struct bio_integrity_payload *bip = bio_integrity(bio);
135         struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
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 #else /* CONFIG_BLK_DEV_INTEGRITY */
141 static inline bool integrity_req_gap_back_merge(struct request *req,
142                 struct bio *next)
143 {
144         return false;
145 }
146 static inline bool integrity_req_gap_front_merge(struct request *req,
147                 struct bio *bio)
148 {
149         return false;
150 }
151 
152 static inline void blk_flush_integrity(void)
153 {
154 }
155 static inline bool bio_integrity_endio(struct bio *bio)
156 {
157         return true;
158 }
159 #endif /* CONFIG_BLK_DEV_INTEGRITY */
160 
161 unsigned long blk_rq_timeout(unsigned long timeout);
162 void blk_add_timer(struct request *req);
163 
164 bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
165                              struct bio *bio);
166 bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
167                             struct bio *bio);
168 bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
169                 struct bio *bio);
170 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
171                             struct request **same_queue_rq);
172 
173 void blk_account_io_start(struct request *req, bool new_io);
174 void blk_account_io_completion(struct request *req, unsigned int bytes);
175 void blk_account_io_done(struct request *req, u64 now);
176 
177 /*
178  * Internal elevator interface
179  */
180 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
181 
182 void blk_insert_flush(struct request *rq);
183 
184 int elevator_init_mq(struct request_queue *q);
185 int elevator_switch_mq(struct request_queue *q,
186                               struct elevator_type *new_e);
187 void __elevator_exit(struct request_queue *, struct elevator_queue *);
188 int elv_register_queue(struct request_queue *q);
189 void elv_unregister_queue(struct request_queue *q);
190 
191 static inline void elevator_exit(struct request_queue *q,
192                 struct elevator_queue *e)
193 {
194         blk_mq_sched_free_requests(q);
195         __elevator_exit(q, e);
196 }
197 
198 struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
199 
200 #ifdef CONFIG_FAIL_IO_TIMEOUT
201 int blk_should_fake_timeout(struct request_queue *);
202 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
203 ssize_t part_timeout_store(struct device *, struct device_attribute *,
204                                 const char *, size_t);
205 #else
206 static inline int blk_should_fake_timeout(struct request_queue *q)
207 {
208         return 0;
209 }
210 #endif
211 
212 int ll_back_merge_fn(struct request_queue *q, struct request *req,
213                      struct bio *bio);
214 int ll_front_merge_fn(struct request_queue *q, struct request *req, 
215                       struct bio *bio);
216 struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
217 struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
218 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
219                                 struct request *next);
220 void blk_recalc_rq_segments(struct request *rq);
221 void blk_rq_set_mixed_merge(struct request *rq);
222 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
223 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
224 
225 int blk_dev_init(void);
226 
227 /*
228  * Contribute to IO statistics IFF:
229  *
230  *      a) it's attached to a gendisk, and
231  *      b) the queue had IO stats enabled when this request was started, and
232  *      c) it's a file system request
233  */
234 static inline bool blk_do_io_stat(struct request *rq)
235 {
236         return rq->rq_disk &&
237                (rq->rq_flags & RQF_IO_STAT) &&
238                 !blk_rq_is_passthrough(rq);
239 }
240 
241 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
242 {
243         req->cmd_flags |= REQ_NOMERGE;
244         if (req == q->last_merge)
245                 q->last_merge = NULL;
246 }
247 
248 /*
249  * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
250  * is defined as 'unsigned int', meantime it has to aligned to with logical
251  * block size which is the minimum accepted unit by hardware.
252  */
253 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
254 {
255         return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
256 }
257 
258 /*
259  * Internal io_context interface
260  */
261 void get_io_context(struct io_context *ioc);
262 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
263 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
264                              gfp_t gfp_mask);
265 void ioc_clear_queue(struct request_queue *q);
266 
267 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
268 
269 /**
270  * create_io_context - try to create task->io_context
271  * @gfp_mask: allocation mask
272  * @node: allocation node
273  *
274  * If %current->io_context is %NULL, allocate a new io_context and install
275  * it.  Returns the current %current->io_context which may be %NULL if
276  * allocation failed.
277  *
278  * Note that this function can't be called with IRQ disabled because
279  * task_lock which protects %current->io_context is IRQ-unsafe.
280  */
281 static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
282 {
283         WARN_ON_ONCE(irqs_disabled());
284         if (unlikely(!current->io_context))
285                 create_task_io_context(current, gfp_mask, node);
286         return current->io_context;
287 }
288 
289 /*
290  * Internal throttling interface
291  */
292 #ifdef CONFIG_BLK_DEV_THROTTLING
293 extern void blk_throtl_drain(struct request_queue *q);
294 extern int blk_throtl_init(struct request_queue *q);
295 extern void blk_throtl_exit(struct request_queue *q);
296 extern void blk_throtl_register_queue(struct request_queue *q);
297 #else /* CONFIG_BLK_DEV_THROTTLING */
298 static inline void blk_throtl_drain(struct request_queue *q) { }
299 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
300 static inline void blk_throtl_exit(struct request_queue *q) { }
301 static inline void blk_throtl_register_queue(struct request_queue *q) { }
302 #endif /* CONFIG_BLK_DEV_THROTTLING */
303 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
304 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
305 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
306         const char *page, size_t count);
307 extern void blk_throtl_bio_endio(struct bio *bio);
308 extern void blk_throtl_stat_add(struct request *rq, u64 time);
309 #else
310 static inline void blk_throtl_bio_endio(struct bio *bio) { }
311 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
312 #endif
313 
314 #ifdef CONFIG_BOUNCE
315 extern int init_emergency_isa_pool(void);
316 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
317 #else
318 static inline int init_emergency_isa_pool(void)
319 {
320         return 0;
321 }
322 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
323 {
324 }
325 #endif /* CONFIG_BOUNCE */
326 
327 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
328 extern int blk_iolatency_init(struct request_queue *q);
329 #else
330 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
331 #endif
332 
333 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
334 
335 #ifdef CONFIG_BLK_DEV_ZONED
336 void blk_queue_free_zone_bitmaps(struct request_queue *q);
337 #else
338 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
339 #endif
340 
341 #endif /* BLK_INTERNAL_H */
342 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp