--- linux-2.4.18-orig/drivers/md/md.c	Mon Nov 18 14:13:29 2002
+++ linux-2.4.18/drivers/md/md.c	Tue Dec 17 11:14:59 2002
@@ -506,20 +506,21 @@
 	if (rdev->sb)
 		MD_BUG();
 
-	rdev->sb = (mdp_super_t *) __get_free_page(GFP_KERNEL);
-	if (!rdev->sb) {
-		EPRINTK(OUT_OF_MEM);
+	rdev->sb_page = alloc_page(GFP_KERNEL);
+	if (!rdev->sb_page) {
+		printk(OUT_OF_MEM);
 		return -EINVAL;
 	}
-	md_clear_page(rdev->sb);
+	rdev->sb = (mdp_super_t *) page_address(rdev->sb_page);
 
 	return 0;
 }
 
 static void free_disk_sb(mdk_rdev_t * rdev)
 {
-	if (rdev->sb) {
-		free_page((unsigned long) rdev->sb);
+	if (rdev->sb_page) {
+		page_cache_release(rdev->sb_page);
+		rdev->sb_page = NULL;
 		rdev->sb = NULL;
 		rdev->sb_offset = 0;
 		rdev->size = 0;
@@ -529,12 +530,42 @@
 	}
 }
 
+static void bh_complete(struct buffer_head *bh, int uptodate)
+{
+
+ if (uptodate)
+     set_bit(BH_Uptodate, &bh->b_state);
+
+ complete((struct completion*)bh->b_private);
+}
+
+static int sync_page_io(kdev_t dev, unsigned long sector, int size,
+         struct page *page, int rw)
+{
+ struct buffer_head bh;
+ struct completion event;
+
+ init_completion(&event);
+ init_buffer(&bh, bh_complete, &event);
+ bh.b_rdev = dev;
+ bh.b_rsector = sector;
+ bh.b_state  = (1 << BH_Req) | (1 << BH_Mapped);
+ bh.b_size = size;
+ bh.b_page = page;
+ bh.b_reqnext = NULL;
+ bh.b_data = page_address(page);
+ generic_make_request(rw, &bh);
+
+ run_task_queue(&tq_disk);
+ wait_for_completion(&event);
+
+ return test_bit(BH_Uptodate, &bh.b_state);
+}
+
 static int read_disk_sb(mdk_rdev_t * rdev)
 {
 	int ret = -EINVAL;
-	struct buffer_head *bh = NULL;
 	kdev_t dev = rdev->dev;
-	mdp_super_t *sb;
 	unsigned long sb_offset;
 
 	if (!rdev->sb) {
@@ -548,22 +579,15 @@
 	 */
 	sb_offset = calc_dev_sboffset(rdev->dev, rdev->mddev, 1);
 	rdev->sb_offset = sb_offset;
-	fsync_dev(dev);
-	set_blocksize (dev, MD_SB_BYTES);
-	bh = bread (dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
-
-	if (bh) {
-		sb = (mdp_super_t *) bh->b_data;
-		memcpy (rdev->sb, sb, MD_SB_BYTES);
-	} else {
-		EPRINTK(NO_SB,partition_name(rdev->dev));
-		goto abort;
+
+	if (!sync_page_io(dev, sb_offset<<1, MD_SB_BYTES, rdev->sb_page, READ))
+	{
+		printk(NO_SB,partition_name(dev));
+		return -EINVAL;
 	}
 	EPRINTK(KERN_INFO " [events: %08lx]\n", (unsigned long)rdev->sb->events_lo);
 	ret = 0;
 abort:
-	if (bh)
-		brelse (bh);
 	return ret;
 }
 
@@ -951,10 +975,8 @@
 
 static int write_disk_sb(mdk_rdev_t * rdev)
 {
-	struct buffer_head *bh;
 	kdev_t dev;
 	unsigned long sb_offset, size;
-	mdp_super_t *sb;
 
 	if (!rdev->sb) {
 		MD_BUG();
@@ -993,23 +1015,10 @@
 	}
 
 	EPRINTK(KERN_INFO "(write) %s's sb offset: %ld\n", partition_name(dev), sb_offset);
-	fsync_dev(dev);
-	set_blocksize(dev, MD_SB_BYTES);
-	bh = getblk(dev, sb_offset / MD_SB_BLOCKS, MD_SB_BYTES);
-	if (!bh) {
-		EPRINTK(GETBLK_FAILED, partition_name(dev));
+	if (!sync_page_io(dev, sb_offset<<1, MD_SB_BYTES, rdev->sb_page, WRITE)) {
+		printk("md: write_disk_sb failed for device %s\n", partition_name(dev));
 		return 1;
 	}
-	memset(bh->b_data,0,bh->b_size);
-	sb = (mdp_super_t *) bh->b_data;
-	memcpy(sb, rdev->sb, MD_SB_BYTES);
-
-	mark_buffer_uptodate(bh, 1);
-	mark_buffer_dirty(bh);
-	ll_rw_block(WRITE, 1, &bh);
-	wait_on_buffer(bh);
-	brelse(bh);
-	fsync_dev(dev);
 skip:
 	return 0;
 }
@@ -1111,6 +1120,11 @@
 		if (rdev->alias_device)
 			printk("(skipping alias ");
 
+		if (disk_faulty(&rdev->sb->this_disk)) {
+			printk("(skipping new-faulty %s )\n",
+				partition_name(rdev->dev));
+			continue;
+		}
 		printk("%s ", partition_name(rdev->dev));
 		/* check for rdev->sb NULL here also.  ARC*/
 		if (!rdev->faulty && !rdev->alias_device && rdev->sb) {
@@ -1143,7 +1157,6 @@
  *   - the device is nonexistent (zero size)
  *   - the device has no valid superblock
  *
- * a faulty rdev _never_ has rdev->sb set.
  */
 static int md_import_device(kdev_t newdev, int on_disk)
 {
@@ -1215,14 +1228,13 @@
 	md_list_add(&rdev->all, &all_raid_disks);
 	MD_INIT_LIST_HEAD(&rdev->pending);
 
-	if (rdev->faulty && rdev->sb)
-		free_disk_sb(rdev);
+//	if (rdev->faulty && rdev->sb)
+//		free_disk_sb(rdev);
 	return 0;
 
 abort_free:
 	if (rdev->sb) {
-		if (rdev->bdev)
-			unlock_rdev(rdev);
+		if (rdev->bdev) unlock_rdev(rdev);
 		free_disk_sb(rdev);
 	}
 	kfree(rdev);
@@ -3136,7 +3148,7 @@
 		return 0;
 	if (!mddev->pers->error_handler
 			|| mddev->pers->error_handler(mddev,rdev) <= 0) {
-		free_disk_sb(rrdev);
+		// free_disk_sb(rrdev);
 		rrdev->faulty = 1;
 	} else
 		return 1;
--- linux-2.4.18-orig/include/linux/raid/md_k.h	Mon Nov 26 08:29:17 2001
+++ linux-2.4.18/include/linux/raid/md_k.h	Tue Dec 17 11:03:14 2002
@@ -171,6 +171,7 @@
 	struct block_device *bdev;	/* block device handle */
 
 	mdp_super_t *sb;
+	struct page *sb_page;
 	unsigned long sb_offset;
 
 	int alias_device;		/* device alias to the same disk */