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Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago. By Lars-Peter Clausen, jz4740: Fix compile error | |
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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_rq_timed_out_timer(unsigned long data); |
22 | void blk_delete_timer(struct request *); |
23 | void blk_add_timer(struct request *); |
24 | void __generic_unplug_device(struct request_queue *); |
25 | |
26 | /* |
27 | * Internal atomic flags for request handling |
28 | */ |
29 | enum rq_atomic_flags { |
30 | REQ_ATOM_COMPLETE = 0, |
31 | }; |
32 | |
33 | /* |
34 | * EH timer and IO completion will both attempt to 'grab' the request, make |
35 | * sure that only one of them succeeds |
36 | */ |
37 | static inline int blk_mark_rq_complete(struct request *rq) |
38 | { |
39 | return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); |
40 | } |
41 | |
42 | static inline void blk_clear_rq_complete(struct request *rq) |
43 | { |
44 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); |
45 | } |
46 | |
47 | /* |
48 | * Internal elevator interface |
49 | */ |
50 | #define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash)) |
51 | |
52 | void blk_insert_flush(struct request *rq); |
53 | void blk_abort_flushes(struct request_queue *q); |
54 | |
55 | static inline struct request *__elv_next_request(struct request_queue *q) |
56 | { |
57 | struct request *rq; |
58 | |
59 | while (1) { |
60 | if (!list_empty(&q->queue_head)) { |
61 | rq = list_entry_rq(q->queue_head.next); |
62 | return rq; |
63 | } |
64 | |
65 | if (!q->elevator->ops->elevator_dispatch_fn(q, 0)) |
66 | return NULL; |
67 | } |
68 | } |
69 | |
70 | static inline void elv_activate_rq(struct request_queue *q, struct request *rq) |
71 | { |
72 | struct elevator_queue *e = q->elevator; |
73 | |
74 | if (e->ops->elevator_activate_req_fn) |
75 | e->ops->elevator_activate_req_fn(q, rq); |
76 | } |
77 | |
78 | static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) |
79 | { |
80 | struct elevator_queue *e = q->elevator; |
81 | |
82 | if (e->ops->elevator_deactivate_req_fn) |
83 | e->ops->elevator_deactivate_req_fn(q, rq); |
84 | } |
85 | |
86 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
87 | int blk_should_fake_timeout(struct request_queue *); |
88 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); |
89 | ssize_t part_timeout_store(struct device *, struct device_attribute *, |
90 | const char *, size_t); |
91 | #else |
92 | static inline int blk_should_fake_timeout(struct request_queue *q) |
93 | { |
94 | return 0; |
95 | } |
96 | #endif |
97 | |
98 | struct io_context *current_io_context(gfp_t gfp_flags, int node); |
99 | |
100 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
101 | struct bio *bio); |
102 | int ll_front_merge_fn(struct request_queue *q, struct request *req, |
103 | struct bio *bio); |
104 | int attempt_back_merge(struct request_queue *q, struct request *rq); |
105 | int attempt_front_merge(struct request_queue *q, struct request *rq); |
106 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
107 | struct request *next); |
108 | void blk_recalc_rq_segments(struct request *rq); |
109 | void blk_rq_set_mixed_merge(struct request *rq); |
110 | |
111 | void blk_queue_congestion_threshold(struct request_queue *q); |
112 | |
113 | int blk_dev_init(void); |
114 | |
115 | void elv_quiesce_start(struct request_queue *q); |
116 | void elv_quiesce_end(struct request_queue *q); |
117 | |
118 | |
119 | /* |
120 | * Return the threshold (number of used requests) at which the queue is |
121 | * considered to be congested. It include a little hysteresis to keep the |
122 | * context switch rate down. |
123 | */ |
124 | static inline int queue_congestion_on_threshold(struct request_queue *q) |
125 | { |
126 | return q->nr_congestion_on; |
127 | } |
128 | |
129 | /* |
130 | * The threshold at which a queue is considered to be uncongested |
131 | */ |
132 | static inline int queue_congestion_off_threshold(struct request_queue *q) |
133 | { |
134 | return q->nr_congestion_off; |
135 | } |
136 | |
137 | static inline int blk_cpu_to_group(int cpu) |
138 | { |
139 | int group = NR_CPUS; |
140 | #ifdef CONFIG_SCHED_MC |
141 | const struct cpumask *mask = cpu_coregroup_mask(cpu); |
142 | group = cpumask_first(mask); |
143 | #elif defined(CONFIG_SCHED_SMT) |
144 | group = cpumask_first(topology_thread_cpumask(cpu)); |
145 | #else |
146 | return cpu; |
147 | #endif |
148 | if (likely(group < NR_CPUS)) |
149 | return group; |
150 | return cpu; |
151 | } |
152 | |
153 | /* |
154 | * Contribute to IO statistics IFF: |
155 | * |
156 | * a) it's attached to a gendisk, and |
157 | * b) the queue had IO stats enabled when this request was started, and |
158 | * c) it's a file system request or a discard request |
159 | */ |
160 | static inline int blk_do_io_stat(struct request *rq) |
161 | { |
162 | return rq->rq_disk && |
163 | (rq->cmd_flags & REQ_IO_STAT) && |
164 | (rq->cmd_type == REQ_TYPE_FS || |
165 | (rq->cmd_flags & REQ_DISCARD)); |
166 | } |
167 | |
168 | #endif |
169 |
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od-2011-09-04
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v2.6.34-rc5
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