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8324aa91 JA |
1 | #ifndef BLK_INTERNAL_H |
2 | #define BLK_INTERNAL_H | |
3 | ||
86db1e29 JA |
4 | /* Amount of time in which a process may batch requests */ |
5 | #define BLK_BATCH_TIME (HZ/50UL) | |
6 | ||
7 | /* Number of requests a "batching" process may submit */ | |
8 | #define BLK_BATCH_REQ 32 | |
9 | ||
8324aa91 JA |
10 | extern struct kmem_cache *blk_requestq_cachep; |
11 | extern struct kobj_type blk_queue_ktype; | |
12 | ||
86db1e29 JA |
13 | void init_request_from_bio(struct request *req, struct bio *bio); |
14 | void blk_rq_bio_prep(struct request_queue *q, struct request *rq, | |
15 | struct bio *bio); | |
a411f4bb BH |
16 | int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
17 | struct bio *bio); | |
9934c8c0 | 18 | void blk_dequeue_request(struct request *rq); |
8324aa91 JA |
19 | void __blk_queue_free_tags(struct request_queue *q); |
20 | ||
242f9dcb JA |
21 | void blk_rq_timed_out_timer(unsigned long data); |
22 | void blk_delete_timer(struct request *); | |
23 | void blk_add_timer(struct request *); | |
f73e2d13 | 24 | void __generic_unplug_device(struct request_queue *); |
24ecfbe2 | 25 | void blk_run_queue_async(struct request_queue *q); |
242f9dcb JA |
26 | |
27 | /* | |
28 | * Internal atomic flags for request handling | |
29 | */ | |
30 | enum rq_atomic_flags { | |
31 | REQ_ATOM_COMPLETE = 0, | |
32 | }; | |
33 | ||
34 | /* | |
35 | * EH timer and IO completion will both attempt to 'grab' the request, make | |
25985edc | 36 | * sure that only one of them succeeds |
242f9dcb JA |
37 | */ |
38 | static inline int blk_mark_rq_complete(struct request *rq) | |
39 | { | |
40 | return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
41 | } | |
42 | ||
43 | static inline void blk_clear_rq_complete(struct request *rq) | |
44 | { | |
45 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
46 | } | |
86db1e29 | 47 | |
158dbda0 TH |
48 | /* |
49 | * Internal elevator interface | |
50 | */ | |
51 | #define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash)) | |
52 | ||
ae1b1539 TH |
53 | void blk_insert_flush(struct request *rq); |
54 | void blk_abort_flushes(struct request_queue *q); | |
dd831006 | 55 | |
158dbda0 TH |
56 | static inline struct request *__elv_next_request(struct request_queue *q) |
57 | { | |
58 | struct request *rq; | |
59 | ||
60 | while (1) { | |
ae1b1539 | 61 | if (!list_empty(&q->queue_head)) { |
158dbda0 | 62 | rq = list_entry_rq(q->queue_head.next); |
ae1b1539 | 63 | return rq; |
158dbda0 TH |
64 | } |
65 | ||
66 | if (!q->elevator->ops->elevator_dispatch_fn(q, 0)) | |
67 | return NULL; | |
68 | } | |
69 | } | |
70 | ||
71 | static inline void elv_activate_rq(struct request_queue *q, struct request *rq) | |
72 | { | |
73 | struct elevator_queue *e = q->elevator; | |
74 | ||
75 | if (e->ops->elevator_activate_req_fn) | |
76 | e->ops->elevator_activate_req_fn(q, rq); | |
77 | } | |
78 | ||
79 | static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) | |
80 | { | |
81 | struct elevator_queue *e = q->elevator; | |
82 | ||
83 | if (e->ops->elevator_deactivate_req_fn) | |
84 | e->ops->elevator_deactivate_req_fn(q, rq); | |
85 | } | |
86 | ||
581d4e28 JA |
87 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
88 | int blk_should_fake_timeout(struct request_queue *); | |
89 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
90 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
91 | const char *, size_t); | |
92 | #else | |
93 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
94 | { | |
95 | return 0; | |
96 | } | |
97 | #endif | |
98 | ||
86db1e29 JA |
99 | struct io_context *current_io_context(gfp_t gfp_flags, int node); |
100 | ||
d6d48196 JA |
101 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
102 | struct bio *bio); | |
103 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
104 | struct bio *bio); | |
105 | int attempt_back_merge(struct request_queue *q, struct request *rq); | |
106 | int attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
107 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
108 | struct request *next); | |
d6d48196 | 109 | void blk_recalc_rq_segments(struct request *rq); |
80a761fd | 110 | void blk_rq_set_mixed_merge(struct request *rq); |
d6d48196 | 111 | |
8324aa91 JA |
112 | void blk_queue_congestion_threshold(struct request_queue *q); |
113 | ||
ff88972c AB |
114 | int blk_dev_init(void); |
115 | ||
f253b86b JA |
116 | void elv_quiesce_start(struct request_queue *q); |
117 | void elv_quiesce_end(struct request_queue *q); | |
118 | ||
119 | ||
8324aa91 JA |
120 | /* |
121 | * Return the threshold (number of used requests) at which the queue is | |
122 | * considered to be congested. It include a little hysteresis to keep the | |
123 | * context switch rate down. | |
124 | */ | |
125 | static inline int queue_congestion_on_threshold(struct request_queue *q) | |
126 | { | |
127 | return q->nr_congestion_on; | |
128 | } | |
129 | ||
130 | /* | |
131 | * The threshold at which a queue is considered to be uncongested | |
132 | */ | |
133 | static inline int queue_congestion_off_threshold(struct request_queue *q) | |
134 | { | |
135 | return q->nr_congestion_off; | |
136 | } | |
137 | ||
c7c22e4d JA |
138 | static inline int blk_cpu_to_group(int cpu) |
139 | { | |
be14eb61 | 140 | int group = NR_CPUS; |
c7c22e4d | 141 | #ifdef CONFIG_SCHED_MC |
be4d638c | 142 | const struct cpumask *mask = cpu_coregroup_mask(cpu); |
be14eb61 | 143 | group = cpumask_first(mask); |
c7c22e4d | 144 | #elif defined(CONFIG_SCHED_SMT) |
be14eb61 | 145 | group = cpumask_first(topology_thread_cpumask(cpu)); |
c7c22e4d JA |
146 | #else |
147 | return cpu; | |
148 | #endif | |
be14eb61 BK |
149 | if (likely(group < NR_CPUS)) |
150 | return group; | |
151 | return cpu; | |
c7c22e4d JA |
152 | } |
153 | ||
c2553b58 JA |
154 | /* |
155 | * Contribute to IO statistics IFF: | |
156 | * | |
157 | * a) it's attached to a gendisk, and | |
158 | * b) the queue had IO stats enabled when this request was started, and | |
3c4198e8 | 159 | * c) it's a file system request or a discard request |
c2553b58 | 160 | */ |
26308eab | 161 | static inline int blk_do_io_stat(struct request *rq) |
fb8ec18c | 162 | { |
33659ebb CH |
163 | return rq->rq_disk && |
164 | (rq->cmd_flags & REQ_IO_STAT) && | |
165 | (rq->cmd_type == REQ_TYPE_FS || | |
166 | (rq->cmd_flags & REQ_DISCARD)); | |
fb8ec18c JA |
167 | } |
168 | ||
8324aa91 | 169 | #endif |