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1 | #ifndef BLK_INTERNAL_H |
2 | #define BLK_INTERNAL_H |
3 | |
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 | |
10 | extern struct kmem_cache *blk_requestq_cachep; |
11 | extern struct kobj_type blk_queue_ktype; |
12 | |
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); |
16 | int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
17 | struct bio *bio); |
18 | void blk_dequeue_request(struct request *rq); |
19 | void __blk_queue_free_tags(struct request_queue *q); |
20 | |
21 | void blk_unplug_work(struct work_struct *work); |
22 | void blk_unplug_timeout(unsigned long data); |
23 | void blk_rq_timed_out_timer(unsigned long data); |
24 | void blk_delete_timer(struct request *); |
25 | void blk_add_timer(struct request *); |
26 | void __generic_unplug_device(struct request_queue *); |
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 | } |
48 | |
49 | /* |
50 | * Internal elevator interface |
51 | */ |
52 | #define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash)) |
53 | |
54 | struct request *blk_do_flush(struct request_queue *q, struct request *rq); |
55 | |
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); |
63 | if (!(rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) || |
64 | rq == &q->flush_rq) |
65 | return rq; |
66 | rq = blk_do_flush(q, rq); |
67 | if (rq) |
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 | |
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 | |
104 | struct io_context *current_io_context(gfp_t gfp_flags, int node); |
105 | |
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); |
113 | void blk_rq_set_mixed_merge(struct request *rq); |
114 | |
115 | void blk_queue_congestion_threshold(struct request_queue *q); |
116 | |
117 | int blk_dev_init(void); |
118 | |
119 | void elv_quiesce_start(struct request_queue *q); |
120 | void elv_quiesce_end(struct request_queue *q); |
121 | |
122 | |
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 | |
141 | static inline int blk_cpu_to_group(int cpu) |
142 | { |
143 | int group = NR_CPUS; |
144 | #ifdef CONFIG_SCHED_MC |
145 | const struct cpumask *mask = cpu_coregroup_mask(cpu); |
146 | group = cpumask_first(mask); |
147 | #elif defined(CONFIG_SCHED_SMT) |
148 | group = cpumask_first(topology_thread_cpumask(cpu)); |
149 | #else |
150 | return cpu; |
151 | #endif |
152 | if (likely(group < NR_CPUS)) |
153 | return group; |
154 | return cpu; |
155 | } |
156 | |
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 |
162 | * c) it's a file system request or a discard request |
163 | */ |
164 | static inline int blk_do_io_stat(struct request *rq) |
165 | { |
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)); |
170 | } |
171 | |
172 | #endif |
173 |
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od-2011-09-04
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v2.6.34-rc5
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