patch-2.4.1 linux/include/linux/blkdev.h

• Lines: 92
• Date: Mon Jan 29 23:24:59 2001
• Orig file: v2.4.0/linux/include/linux/blkdev.h
• Orig date: Thu Jan 4 14:50:47 2001

diff -u --recursive --new-file v2.4.0/linux/include/linux/blkdev.h linux/include/linux/blkdev.h
@@ -23,8 +23,6 @@
 	int elevator_sequence;
 	struct list_head table;
 
-	struct list_head *free_list;
-
 	volatile int rq_status;	/* should split this into a few status bits */
 #define RQ_INACTIVE		(-1)
 #define RQ_ACTIVE		1
@@ -47,7 +45,6 @@
 	struct buffer_head * bh;
 	struct buffer_head * bhtail;
 	request_queue_t *q;
-	elevator_t *e;
 };
 
 #include <linux/elevator.h>
@@ -67,9 +64,10 @@
 typedef void (unplug_device_fn) (void *q);
 
 /*
- * Default nr free requests per queue
+ * Default nr free requests per queue, ll_rw_blk will scale it down
+ * according to available RAM at init time
  */
-#define QUEUE_NR_REQUESTS	256
+#define QUEUE_NR_REQUESTS	8192
 
 struct request_queue
 {
@@ -77,6 +75,8 @@
 	 * the queue request freelist, one for reads and one for writes
 	 */
 	struct list_head	request_freelist[2];
+	struct list_head	pending_freelist[2];
+	int			pending_free[2];
 
 	/*
 	 * Together with queue_head for cacheline sharing
@@ -116,7 +116,7 @@
 	 * Is meant to protect the queue in the future instead of
 	 * io_request_lock
 	 */
-	spinlock_t		request_lock;
+	spinlock_t		queue_lock;
 
 	/*
 	 * Tasks wait here for free request
@@ -152,6 +152,7 @@
 extern void register_disk(struct gendisk *dev, kdev_t first, unsigned minors, struct block_device_operations *ops, long size);
 extern void generic_make_request(int rw, struct buffer_head * bh);
 extern request_queue_t *blk_get_queue(kdev_t dev);
+extern inline request_queue_t *__blk_get_queue(kdev_t dev);
 extern void blkdev_release_request(struct request *);
 
 /*
@@ -162,6 +163,7 @@
 extern void blk_queue_headactive(request_queue_t *, int);
 extern void blk_queue_pluggable(request_queue_t *, plug_device_fn *);
 extern void blk_queue_make_request(request_queue_t *, make_request_fn *);
+extern void generic_unplug_device(void *);
 
 extern int * blk_size[MAX_BLKDEV];
 
@@ -175,9 +177,10 @@
 
 extern int * max_segments[MAX_BLKDEV];
 
-#define MAX_SECTORS 254
+extern atomic_t queued_sectors;
 
-#define MAX_SEGMENTS MAX_SECTORS
+#define MAX_SEGMENTS 128
+#define MAX_SECTORS (MAX_SEGMENTS*8)
 
 #define PageAlignSize(size) (((size) + PAGE_SIZE -1) & PAGE_MASK)
 
@@ -203,5 +206,14 @@
 		return 512;
 }
 
+#define blk_finished_io(nsects)				\
+	atomic_sub(nsects, &queued_sectors);		\
+	if (atomic_read(&queued_sectors) < 0) {		\
+		printk("block: queued_sectors < 0\n");	\
+		atomic_set(&queued_sectors, 0);		\
+	}
+
+#define blk_started_io(nsects)				\
+	atomic_add(nsects, &queued_sectors);
 
 #endif