110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/****************************************************************************
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****************************************************************************
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***
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*** This header was automatically generated from a Linux kernel header
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*** of the same name, to make information necessary for userspace to
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*** call into the kernel available to libc. It contains only constants,
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*** structures, and macros generated from the original header, and thus,
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*** contains no copyrightable information.
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***
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****************************************************************************
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****************************************************************************/
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#ifndef _LINUX_ELEVATOR_H
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#define _LINUX_ELEVATOR_H
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typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
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struct bio *);
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typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
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typedef void (elevator_merged_fn) (request_queue_t *, struct request *);
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typedef int (elevator_dispatch_fn) (request_queue_t *, int);
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typedef void (elevator_add_req_fn) (request_queue_t *, struct request *);
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typedef int (elevator_queue_empty_fn) (request_queue_t *);
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typedef struct request *(elevator_request_list_fn) (request_queue_t *, struct request *);
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typedef void (elevator_completed_req_fn) (request_queue_t *, struct request *);
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typedef int (elevator_may_queue_fn) (request_queue_t *, int, struct bio *);
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typedef int (elevator_set_req_fn) (request_queue_t *, struct request *, struct bio *, gfp_t);
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typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
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typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *);
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typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
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typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *);
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typedef void (elevator_exit_fn) (elevator_t *);
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struct elevator_ops
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{
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elevator_merge_fn *elevator_merge_fn;
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elevator_merged_fn *elevator_merged_fn;
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elevator_merge_req_fn *elevator_merge_req_fn;
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elevator_dispatch_fn *elevator_dispatch_fn;
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elevator_add_req_fn *elevator_add_req_fn;
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elevator_activate_req_fn *elevator_activate_req_fn;
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elevator_deactivate_req_fn *elevator_deactivate_req_fn;
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elevator_queue_empty_fn *elevator_queue_empty_fn;
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elevator_completed_req_fn *elevator_completed_req_fn;
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elevator_request_list_fn *elevator_former_req_fn;
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elevator_request_list_fn *elevator_latter_req_fn;
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elevator_set_req_fn *elevator_set_req_fn;
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elevator_put_req_fn *elevator_put_req_fn;
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elevator_may_queue_fn *elevator_may_queue_fn;
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elevator_init_fn *elevator_init_fn;
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elevator_exit_fn *elevator_exit_fn;
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void (*trim)(struct io_context *);
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};
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#define ELV_NAME_MAX (16)
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struct elv_fs_entry {
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struct attribute attr;
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ssize_t (*show)(elevator_t *, char *);
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ssize_t (*store)(elevator_t *, const char *, size_t);
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};
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struct elevator_type
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{
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struct list_head list;
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struct elevator_ops ops;
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struct elevator_type *elevator_type;
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struct elv_fs_entry *elevator_attrs;
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char elevator_name[ELV_NAME_MAX];
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struct module *elevator_owner;
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};
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struct elevator_queue
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{
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struct elevator_ops *ops;
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void *elevator_data;
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struct kobject kobj;
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struct elevator_type *elevator_type;
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struct mutex sysfs_lock;
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};
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#define ELEVATOR_NO_MERGE 0
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#define ELEVATOR_FRONT_MERGE 1
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#define ELEVATOR_BACK_MERGE 2
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#define ELEVATOR_INSERT_FRONT 1
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#define ELEVATOR_INSERT_BACK 2
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#define ELEVATOR_INSERT_SORT 3
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#define ELEVATOR_INSERT_REQUEUE 4
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enum {
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ELV_MQUEUE_MAY,
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ELV_MQUEUE_NO,
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ELV_MQUEUE_MUST,
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};
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#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
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#endif
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