]>
Commit | Line | Data |
---|---|---|
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 | ||
86db1e29 JA |
21 | void blk_unplug_work(struct work_struct *work); |
22 | void blk_unplug_timeout(unsigned long data); | |
242f9dcb JA |
23 | void blk_rq_timed_out_timer(unsigned long data); |
24 | void blk_delete_timer(struct request *); | |
25 | void blk_add_timer(struct request *); | |
f73e2d13 | 26 | void __generic_unplug_device(struct request_queue *); |
242f9dcb JA |
27 | |
28 | /* | |
29 | * Internal atomic flags for request handling | |
30 | */ | |
31 | enum rq_atomic_flags { | |
32 | REQ_ATOM_COMPLETE = 0, | |
33 | }; | |
34 | ||
35 | /* | |
36 | * EH timer and IO completion will both attempt to 'grab' the request, make | |
37 | * sure that only one of them suceeds | |
38 | */ | |
39 | static inline int blk_mark_rq_complete(struct request *rq) | |
40 | { | |
41 | return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
42 | } | |
43 | ||
44 | static inline void blk_clear_rq_complete(struct request *rq) | |
45 | { | |
46 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); | |
47 | } | |
86db1e29 | 48 | |
158dbda0 TH |
49 | /* |
50 | * Internal elevator interface | |
51 | */ | |
52 | #define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash)) | |
53 | ||
dd4c133f | 54 | struct request *blk_do_flush(struct request_queue *q, struct request *rq); |
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) { | |
61 | while (!list_empty(&q->queue_head)) { | |
62 | rq = list_entry_rq(q->queue_head.next); | |
4fed947c TH |
63 | if (!(rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) || |
64 | rq == &q->flush_rq) | |
65 | return rq; | |
dd4c133f | 66 | rq = blk_do_flush(q, rq); |
dd831006 | 67 | if (rq) |
158dbda0 TH |
68 | return rq; |
69 | } | |
70 | ||
71 | if (!q->elevator->ops->elevator_dispatch_fn(q, 0)) | |
72 | return NULL; | |
73 | } | |
74 | } | |
75 | ||
76 | static inline void elv_activate_rq(struct request_queue *q, struct request *rq) | |
77 | { | |
78 | struct elevator_queue *e = q->elevator; | |
79 | ||
80 | if (e->ops->elevator_activate_req_fn) | |
81 | e->ops->elevator_activate_req_fn(q, rq); | |
82 | } | |
83 | ||
84 | static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) | |
85 | { | |
86 | struct elevator_queue *e = q->elevator; | |
87 | ||
88 | if (e->ops->elevator_deactivate_req_fn) | |
89 | e->ops->elevator_deactivate_req_fn(q, rq); | |
90 | } | |
91 | ||
581d4e28 JA |
92 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
93 | int blk_should_fake_timeout(struct request_queue *); | |
94 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
95 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
96 | const char *, size_t); | |
97 | #else | |
98 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
99 | { | |
100 | return 0; | |
101 | } | |
102 | #endif | |
103 | ||
86db1e29 JA |
104 | struct io_context *current_io_context(gfp_t gfp_flags, int node); |
105 | ||
d6d48196 JA |
106 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
107 | struct bio *bio); | |
108 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
109 | struct bio *bio); | |
110 | int attempt_back_merge(struct request_queue *q, struct request *rq); | |
111 | int attempt_front_merge(struct request_queue *q, struct request *rq); | |
112 | void blk_recalc_rq_segments(struct request *rq); | |
80a761fd | 113 | void blk_rq_set_mixed_merge(struct request *rq); |
d6d48196 | 114 | |
8324aa91 JA |
115 | void blk_queue_congestion_threshold(struct request_queue *q); |
116 | ||
ff88972c AB |
117 | int blk_dev_init(void); |
118 | ||
f253b86b JA |
119 | void elv_quiesce_start(struct request_queue *q); |
120 | void elv_quiesce_end(struct request_queue *q); | |
121 | ||
122 | ||
8324aa91 JA |
123 | /* |
124 | * Return the threshold (number of used requests) at which the queue is | |
125 | * considered to be congested. It include a little hysteresis to keep the | |
126 | * context switch rate down. | |
127 | */ | |
128 | static inline int queue_congestion_on_threshold(struct request_queue *q) | |
129 | { | |
130 | return q->nr_congestion_on; | |
131 | } | |
132 | ||
133 | /* | |
134 | * The threshold at which a queue is considered to be uncongested | |
135 | */ | |
136 | static inline int queue_congestion_off_threshold(struct request_queue *q) | |
137 | { | |
138 | return q->nr_congestion_off; | |
139 | } | |
140 | ||
c7c22e4d JA |
141 | static inline int blk_cpu_to_group(int cpu) |
142 | { | |
be14eb61 | 143 | int group = NR_CPUS; |
c7c22e4d | 144 | #ifdef CONFIG_SCHED_MC |
be4d638c | 145 | const struct cpumask *mask = cpu_coregroup_mask(cpu); |
be14eb61 | 146 | group = cpumask_first(mask); |
c7c22e4d | 147 | #elif defined(CONFIG_SCHED_SMT) |
be14eb61 | 148 | group = cpumask_first(topology_thread_cpumask(cpu)); |
c7c22e4d JA |
149 | #else |
150 | return cpu; | |
151 | #endif | |
be14eb61 BK |
152 | if (likely(group < NR_CPUS)) |
153 | return group; | |
154 | return cpu; | |
c7c22e4d JA |
155 | } |
156 | ||
c2553b58 JA |
157 | /* |
158 | * Contribute to IO statistics IFF: | |
159 | * | |
160 | * a) it's attached to a gendisk, and | |
161 | * b) the queue had IO stats enabled when this request was started, and | |
3c4198e8 | 162 | * c) it's a file system request or a discard request |
c2553b58 | 163 | */ |
26308eab | 164 | static inline int blk_do_io_stat(struct request *rq) |
fb8ec18c | 165 | { |
33659ebb CH |
166 | return rq->rq_disk && |
167 | (rq->cmd_flags & REQ_IO_STAT) && | |
168 | (rq->cmd_type == REQ_TYPE_FS || | |
169 | (rq->cmd_flags & REQ_DISCARD)); | |
fb8ec18c JA |
170 | } |
171 | ||
8324aa91 | 172 | #endif |