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80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
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#ifndef IOCONTEXT_H
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#define IOCONTEXT_H
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/*
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* This is the per-process anticipatory I/O scheduler state.
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*/
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struct as_io_context {
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spinlock_t lock;
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void (*dtor)(struct as_io_context *aic); /* destructor */
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void (*exit)(struct as_io_context *aic); /* called on task exit */
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unsigned long state;
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atomic_t nr_queued; /* queued reads & sync writes */
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atomic_t nr_dispatched; /* number of requests gone to the drivers */
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/* IO History tracking */
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/* Thinktime */
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unsigned long last_end_request;
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unsigned long ttime_total;
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unsigned long ttime_samples;
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unsigned long ttime_mean;
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/* Layout pattern */
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unsigned int seek_samples;
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sector_t last_request_pos;
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u64 seek_total;
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sector_t seek_mean;
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};
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struct cfq_queue;
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struct cfq_io_context {
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struct rb_node rb_node;
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void *key;
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struct cfq_queue *cfqq[2];
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struct io_context *ioc;
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unsigned long last_end_request;
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sector_t last_request_pos;
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unsigned long ttime_total;
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unsigned long ttime_samples;
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unsigned long ttime_mean;
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unsigned int seek_samples;
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u64 seek_total;
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sector_t seek_mean;
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struct list_head queue_list;
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void (*dtor)(struct io_context *); /* destructor */
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void (*exit)(struct io_context *); /* called on task exit */
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};
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/*
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* This is the per-process I/O subsystem state. It is refcounted and
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* kmalloc'ed. Currently all fields are modified in process io context
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* (apart from the atomic refcount), so require no locking.
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*/
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struct io_context {
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atomic_t refcount;
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struct task_struct *task;
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unsigned short ioprio;
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unsigned short ioprio_changed;
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/*
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* For request batching
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*/
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unsigned long last_waited; /* Time last woken after wait for request */
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int nr_batch_requests; /* Number of requests left in the batch */
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struct as_io_context *aic;
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struct rb_root cic_root;
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void *ioc_data;
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};
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#endif
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