patch-2.4.0-test9 linux/drivers/block/linear.c

• Lines: 214
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.0-test8/linux/drivers/block/linear.c
• Orig date: Thu Aug 10 12:35:50 2000

diff -u --recursive --new-file v2.4.0-test8/linux/drivers/block/linear.c linux/drivers/block/linear.c
@@ -1,213 +0,0 @@
-/*
-   linear.c : Multiple Devices driver for Linux
-              Copyright (C) 1994-96 Marc ZYNGIER
-	      <zyngier@ufr-info-p7.ibp.fr> or
-	      <maz@gloups.fdn.fr>
-
-   Linear mode management functions.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-   
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
-*/
-
-#include <linux/module.h>
-
-#include <linux/raid/md.h>
-#include <linux/malloc.h>
-
-#include <linux/raid/linear.h>
-
-#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
-#define MD_PERSONALITY
-
-static int linear_run (mddev_t *mddev)
-{
-	linear_conf_t *conf;
-	struct linear_hash *table;
-	mdk_rdev_t *rdev;
-	int size, i, j, nb_zone;
-	unsigned int curr_offset;
-
-	MOD_INC_USE_COUNT;
-
-	conf = kmalloc (sizeof (*conf), GFP_KERNEL);
-	if (!conf)
-		goto out;
-	mddev->private = conf;
-
-	if (md_check_ordering(mddev)) {
-		printk("linear: disks are not ordered, aborting!\n");
-		goto out;
-	}
-	/*
-	 * Find the smallest device.
-	 */
-
-	conf->smallest = NULL;
-	curr_offset = 0;
-	ITERATE_RDEV_ORDERED(mddev,rdev,j) {
-		dev_info_t *disk = conf->disks + j;
-
-		disk->dev = rdev->dev;
-		disk->size = rdev->size;
-		disk->offset = curr_offset;
-
-		curr_offset += disk->size;
-
-		if (!conf->smallest || (disk->size < conf->smallest->size))
-			conf->smallest = disk;
-	}
-
-	nb_zone = conf->nr_zones =
-		md_size[mdidx(mddev)] / conf->smallest->size +
-		((md_size[mdidx(mddev)] % conf->smallest->size) ? 1 : 0);
-  
-	conf->hash_table = kmalloc (sizeof (struct linear_hash) * nb_zone,
-					GFP_KERNEL);
-	if (!conf->hash_table)
-		goto out;
-
-	/*
-	 * Here we generate the linear hash table
-	 */
-	table = conf->hash_table;
-	i = 0;
-	size = 0;
-	for (j = 0; j < mddev->nb_dev; j++) {
-		dev_info_t *disk = conf->disks + j;
-
-		if (size < 0) {
-			table->dev1 = disk;
-			table++;
-		}
-		size += disk->size;
-
-		while (size) {
-			table->dev0 = disk;
-			size -= conf->smallest->size;
-			if (size < 0)
-				break;
-			table->dev1 = NULL;
-			table++;
-		}
-	}
-	table->dev1 = NULL;
-
-	return 0;
-
-out:
-	if (conf)
-		kfree(conf);
-	MOD_DEC_USE_COUNT;
-	return 1;
-}
-
-static int linear_stop (mddev_t *mddev)
-{
-	linear_conf_t *conf = mddev_to_conf(mddev);
-  
-	kfree(conf->hash_table);
-	kfree(conf);
-
-	MOD_DEC_USE_COUNT;
-
-	return 0;
-}
-
-static int linear_make_request (mddev_t *mddev,
-			int rw, struct buffer_head * bh)
-{
-        linear_conf_t *conf = mddev_to_conf(mddev);
-        struct linear_hash *hash;
-        dev_info_t *tmp_dev;
-        long block;
-
-	block = bh->b_rsector >> 1;
-	hash = conf->hash_table + (block / conf->smallest->size);
-  
-	if (block >= (hash->dev0->size + hash->dev0->offset)) {
-		if (!hash->dev1) {
-			printk ("linear_make_request : hash->dev1==NULL for block %ld\n",
-						block);
-			return -1;
-		}
-		tmp_dev = hash->dev1;
-	} else
-		tmp_dev = hash->dev0;
-    
-	if (block >= (tmp_dev->size + tmp_dev->offset)
-				|| block < tmp_dev->offset) {
-		printk ("linear_make_request: Block %ld out of bounds on dev %s size %ld offset %ld\n", block, kdevname(tmp_dev->dev), tmp_dev->size, tmp_dev->offset);
-		return -1;
-	}
-	bh->b_rdev = tmp_dev->dev;
-	bh->b_rsector = bh->b_rsector - (tmp_dev->offset << 1);
-
-	return 1;
-}
-
-static int linear_status (char *page, mddev_t *mddev)
-{
-	int sz = 0;
-
-#undef MD_DEBUG
-#ifdef MD_DEBUG
-	int j;
-	linear_conf_t *conf = mddev_to_conf(mddev);
-  
-	sz += sprintf(page+sz, "      ");
-	for (j = 0; j < conf->nr_zones; j++)
-	{
-		sz += sprintf(page+sz, "[%s",
-			partition_name(conf->hash_table[j].dev0->dev));
-
-		if (conf->hash_table[j].dev1)
-			sz += sprintf(page+sz, "/%s] ",
-			  partition_name(conf->hash_table[j].dev1->dev));
-		else
-			sz += sprintf(page+sz, "] ");
-	}
-	sz += sprintf(page+sz, "\n");
-#endif
-	sz += sprintf(page+sz, " %dk rounding", mddev->param.chunk_size/1024);
-	return sz;
-}
-
-
-static mdk_personality_t linear_personality=
-{
-	name:		"linear",
-	make_request:	linear_make_request,
-	run:		linear_run,
-	stop:		linear_stop,
-	status:		linear_status,
-};
-
-#ifndef MODULE
-
-void md__init linear_init (void)
-{
-	register_md_personality (LINEAR, &linear_personality);
-}
-
-#else
-
-int init_module (void)
-{
-	return (register_md_personality (LINEAR, &linear_personality));
-}
-
-void cleanup_module (void)
-{
-	unregister_md_personality (LINEAR);
-}
-
-#endif
-