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fd0928df JA |
1 | #ifndef IOCONTEXT_H |
2 | #define IOCONTEXT_H | |
3 | ||
4ac845a2 | 4 | #include <linux/radix-tree.h> |
34e6bbf2 | 5 | #include <linux/rcupdate.h> |
4ac845a2 | 6 | |
fd0928df | 7 | struct cfq_queue; |
383cd721 SL |
8 | struct cfq_ttime { |
9 | unsigned long last_end_request; | |
10 | ||
11 | unsigned long ttime_total; | |
12 | unsigned long ttime_samples; | |
13 | unsigned long ttime_mean; | |
14 | }; | |
15 | ||
fd0928df | 16 | struct cfq_io_context { |
fd0928df JA |
17 | void *key; |
18 | ||
19 | struct cfq_queue *cfqq[2]; | |
20 | ||
21 | struct io_context *ioc; | |
22 | ||
383cd721 | 23 | struct cfq_ttime ttime; |
fd0928df | 24 | |
fd0928df | 25 | struct list_head queue_list; |
ffc4e759 | 26 | struct hlist_node cic_list; |
fd0928df JA |
27 | |
28 | void (*dtor)(struct io_context *); /* destructor */ | |
29 | void (*exit)(struct io_context *); /* called on task exit */ | |
34e6bbf2 FC |
30 | |
31 | struct rcu_head rcu_head; | |
fd0928df JA |
32 | }; |
33 | ||
34 | /* | |
d38ecf93 JA |
35 | * I/O subsystem state of the associated processes. It is refcounted |
36 | * and kmalloc'ed. These could be shared between processes. | |
fd0928df JA |
37 | */ |
38 | struct io_context { | |
d9c7d394 | 39 | atomic_long_t refcount; |
d38ecf93 JA |
40 | atomic_t nr_tasks; |
41 | ||
42 | /* all the fields below are protected by this lock */ | |
43 | spinlock_t lock; | |
fd0928df JA |
44 | |
45 | unsigned short ioprio; | |
46 | unsigned short ioprio_changed; | |
47 | ||
67523c48 | 48 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
31e4c28d VG |
49 | unsigned short cgroup_changed; |
50 | #endif | |
51 | ||
fd0928df JA |
52 | /* |
53 | * For request batching | |
54 | */ | |
fd0928df | 55 | int nr_batch_requests; /* Number of requests left in the batch */ |
58c24a61 | 56 | unsigned long last_waited; /* Time last woken after wait for request */ |
fd0928df | 57 | |
4ac845a2 | 58 | struct radix_tree_root radix_root; |
ffc4e759 | 59 | struct hlist_head cic_list; |
4d2deb40 | 60 | void __rcu *ioc_data; |
fd0928df JA |
61 | }; |
62 | ||
d38ecf93 JA |
63 | static inline struct io_context *ioc_task_link(struct io_context *ioc) |
64 | { | |
65 | /* | |
66 | * if ref count is zero, don't allow sharing (ioc is going away, it's | |
67 | * a race). | |
68 | */ | |
d9c7d394 | 69 | if (ioc && atomic_long_inc_not_zero(&ioc->refcount)) { |
cbb4f264 | 70 | atomic_inc(&ioc->nr_tasks); |
d38ecf93 | 71 | return ioc; |
d237e5c7 | 72 | } |
d38ecf93 JA |
73 | |
74 | return NULL; | |
75 | } | |
76 | ||
b69f2292 | 77 | struct task_struct; |
da9cbc87 JA |
78 | #ifdef CONFIG_BLOCK |
79 | int put_io_context(struct io_context *ioc); | |
b69f2292 | 80 | void exit_io_context(struct task_struct *task); |
da9cbc87 JA |
81 | struct io_context *get_io_context(gfp_t gfp_flags, int node); |
82 | struct io_context *alloc_io_context(gfp_t gfp_flags, int node); | |
da9cbc87 | 83 | #else |
b69f2292 | 84 | static inline void exit_io_context(struct task_struct *task) |
da9cbc87 JA |
85 | { |
86 | } | |
87 | ||
88 | struct io_context; | |
89 | static inline int put_io_context(struct io_context *ioc) | |
90 | { | |
91 | return 1; | |
92 | } | |
93 | #endif | |
94 | ||
fd0928df | 95 | #endif |