111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert/**************************************************************************** 211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert **************************************************************************** 311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** 411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** This header was automatically generated from a Linux kernel header 511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** of the same name, to make information necessary for userspace to 611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** call into the kernel available to libc. It contains only constants, 711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** structures, and macros generated from the original header, and thus, 811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** contains no copyrightable information. 911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert *** 1011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert **************************************************************************** 1111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ****************************************************************************/ 1211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#ifndef _LINUX_ELEVATOR_H 1311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define _LINUX_ELEVATOR_H 1411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1511cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef int (elevator_merge_fn) (request_queue_t *, struct request **, 1611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct bio *); 1711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1811cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *); 1911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2011cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_merged_fn) (request_queue_t *, struct request *); 2111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2211cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef int (elevator_dispatch_fn) (request_queue_t *, int); 2311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2411cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_add_req_fn) (request_queue_t *, struct request *); 2511cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef int (elevator_queue_empty_fn) (request_queue_t *); 2611cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef struct request *(elevator_request_list_fn) (request_queue_t *, struct request *); 2711cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_completed_req_fn) (request_queue_t *, struct request *); 2811cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef int (elevator_may_queue_fn) (request_queue_t *, int, struct bio *); 2911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 3011cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef int (elevator_set_req_fn) (request_queue_t *, struct request *, struct bio *, gfp_t); 3111cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_put_req_fn) (request_queue_t *, struct request *); 3211cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_activate_req_fn) (request_queue_t *, struct request *); 3311cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *); 3411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 3511cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void *(elevator_init_fn) (request_queue_t *, elevator_t *); 3611cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttypedef void (elevator_exit_fn) (elevator_t *); 3711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 3811cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct elevator_ops 3911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 4011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_merge_fn *elevator_merge_fn; 4111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_merged_fn *elevator_merged_fn; 4211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_merge_req_fn *elevator_merge_req_fn; 4311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 4411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_dispatch_fn *elevator_dispatch_fn; 4511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_add_req_fn *elevator_add_req_fn; 4611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_activate_req_fn *elevator_activate_req_fn; 4711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_deactivate_req_fn *elevator_deactivate_req_fn; 4811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 4911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_queue_empty_fn *elevator_queue_empty_fn; 5011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_completed_req_fn *elevator_completed_req_fn; 5111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 5211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_request_list_fn *elevator_former_req_fn; 5311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_request_list_fn *elevator_latter_req_fn; 5411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 5511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_set_req_fn *elevator_set_req_fn; 5611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_put_req_fn *elevator_put_req_fn; 5711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 5811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_may_queue_fn *elevator_may_queue_fn; 5911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 6011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_init_fn *elevator_init_fn; 6111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert elevator_exit_fn *elevator_exit_fn; 6211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert void (*trim)(struct io_context *); 6311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 6411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 6511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELV_NAME_MAX (16) 6611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 6711cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct elv_fs_entry { 6811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct attribute attr; 6911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ssize_t (*show)(elevator_t *, char *); 7011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ssize_t (*store)(elevator_t *, const char *, size_t); 7111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 7211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 7311cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct elevator_type 7411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 7511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct list_head list; 7611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct elevator_ops ops; 7711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct elevator_type *elevator_type; 7811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct elv_fs_entry *elevator_attrs; 7911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert char elevator_name[ELV_NAME_MAX]; 8011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct module *elevator_owner; 8111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 8211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 8311cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct elevator_queue 8411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 8511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct elevator_ops *ops; 8611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert void *elevator_data; 8711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct kobject kobj; 8811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct elevator_type *elevator_type; 8911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert struct mutex sysfs_lock; 9011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 9111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 9211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_NO_MERGE 0 9311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_FRONT_MERGE 1 9411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_BACK_MERGE 2 9511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 9611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_INSERT_FRONT 1 9711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_INSERT_BACK 2 9811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_INSERT_SORT 3 9911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define ELEVATOR_INSERT_REQUEUE 4 10011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 10111cd02dfb91661c65134cac258cf5924270e9d2Dan Albertenum { 10211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ELV_MQUEUE_MAY, 10311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ELV_MQUEUE_NO, 10411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ELV_MQUEUE_MUST, 10511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 10611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 10711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors) 10811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 10911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#endif 110