Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 145 insertions, 0 deletions

diff --git a/include/linux/elevator.h b/include/linux/elevator.h
new file mode 100644
index 000000000000..ee54f81faad5
--- /dev/null
+++ b/include/linux/elevator.h
@@ -0,0 +1,145 @@
+#ifndef _LINUX_ELEVATOR_H
+#define _LINUX_ELEVATOR_H
+
+typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
+				 struct bio *);
+
+typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
+
+typedef void (elevator_merged_fn) (request_queue_t *, struct request *);
+
+typedef struct request *(elevator_next_req_fn) (request_queue_t *);
+
+typedef void (elevator_add_req_fn) (request_queue_t *, struct request *, int);
+typedef int (elevator_queue_empty_fn) (request_queue_t *);
+typedef void (elevator_remove_req_fn) (request_queue_t *, struct request *);
+typedef void (elevator_requeue_req_fn) (request_queue_t *, struct request *);
+typedef struct request *(elevator_request_list_fn) (request_queue_t *, struct request *);
+typedef void (elevator_completed_req_fn) (request_queue_t *, struct request *);
+typedef int (elevator_may_queue_fn) (request_queue_t *, int);
+
+typedef int (elevator_set_req_fn) (request_queue_t *, struct request *, int);
+typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
+typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
+
+typedef int (elevator_init_fn) (request_queue_t *, elevator_t *);
+typedef void (elevator_exit_fn) (elevator_t *);
+
+struct elevator_ops
+{
+	elevator_merge_fn *elevator_merge_fn;
+	elevator_merged_fn *elevator_merged_fn;
+	elevator_merge_req_fn *elevator_merge_req_fn;
+
+	elevator_next_req_fn *elevator_next_req_fn;
+	elevator_add_req_fn *elevator_add_req_fn;
+	elevator_remove_req_fn *elevator_remove_req_fn;
+	elevator_requeue_req_fn *elevator_requeue_req_fn;
+	elevator_deactivate_req_fn *elevator_deactivate_req_fn;
+
+	elevator_queue_empty_fn *elevator_queue_empty_fn;
+	elevator_completed_req_fn *elevator_completed_req_fn;
+
+	elevator_request_list_fn *elevator_former_req_fn;
+	elevator_request_list_fn *elevator_latter_req_fn;
+
+	elevator_set_req_fn *elevator_set_req_fn;
+	elevator_put_req_fn *elevator_put_req_fn;
+
+	elevator_may_queue_fn *elevator_may_queue_fn;
+
+	elevator_init_fn *elevator_init_fn;
+	elevator_exit_fn *elevator_exit_fn;
+};
+
+#define ELV_NAME_MAX	(16)
+
+/*
+ * identifies an elevator type, such as AS or deadline
+ */
+struct elevator_type
+{
+	struct list_head list;
+	struct elevator_ops ops;
+	struct elevator_type *elevator_type;
+	struct kobj_type *elevator_ktype;
+	char elevator_name[ELV_NAME_MAX];
+	struct module *elevator_owner;
+};
+
+/*
+ * each queue has an elevator_queue assoicated with it
+ */
+struct elevator_queue
+{
+	struct elevator_ops *ops;
+	void *elevator_data;
+	struct kobject kobj;
+	struct elevator_type *elevator_type;
+};
+
+/*
+ * block elevator interface
+ */
+extern void elv_add_request(request_queue_t *, struct request *, int, int);
+extern void __elv_add_request(request_queue_t *, struct request *, int, int);
+extern int elv_merge(request_queue_t *, struct request **, struct bio *);
+extern void elv_merge_requests(request_queue_t *, struct request *,
+			       struct request *);
+extern void elv_merged_request(request_queue_t *, struct request *);
+extern void elv_remove_request(request_queue_t *, struct request *);
+extern void elv_requeue_request(request_queue_t *, struct request *);
+extern void elv_deactivate_request(request_queue_t *, struct request *);
+extern int elv_queue_empty(request_queue_t *);
+extern struct request *elv_next_request(struct request_queue *q);
+extern struct request *elv_former_request(request_queue_t *, struct request *);
+extern struct request *elv_latter_request(request_queue_t *, struct request *);
+extern int elv_register_queue(request_queue_t *q);
+extern void elv_unregister_queue(request_queue_t *q);
+extern int elv_may_queue(request_queue_t *, int);
+extern void elv_completed_request(request_queue_t *, struct request *);
+extern int elv_set_request(request_queue_t *, struct request *, int);
+extern void elv_put_request(request_queue_t *, struct request *);
+
+/*
+ * io scheduler registration
+ */
+extern int elv_register(struct elevator_type *);
+extern void elv_unregister(struct elevator_type *);
+
+/*
+ * io scheduler sysfs switching
+ */
+extern ssize_t elv_iosched_show(request_queue_t *, char *);
+extern ssize_t elv_iosched_store(request_queue_t *, const char *, size_t);
+
+extern int elevator_init(request_queue_t *, char *);
+extern void elevator_exit(elevator_t *);
+extern int elv_rq_merge_ok(struct request *, struct bio *);
+extern int elv_try_merge(struct request *, struct bio *);
+extern int elv_try_last_merge(request_queue_t *, struct bio *);
+
+/*
+ * Return values from elevator merger
+ */
+#define ELEVATOR_NO_MERGE	0
+#define ELEVATOR_FRONT_MERGE	1
+#define ELEVATOR_BACK_MERGE	2
+
+/*
+ * Insertion selection
+ */
+#define ELEVATOR_INSERT_FRONT	1
+#define ELEVATOR_INSERT_BACK	2
+#define ELEVATOR_INSERT_SORT	3
+
+/*
+ * return values from elevator_may_queue_fn
+ */
+enum {
+	ELV_MQUEUE_MAY,
+	ELV_MQUEUE_NO,
+	ELV_MQUEUE_MUST,
+};
+
+#endif