The following fixes were required for me to compile 2.3.48 with LVM. 
-- Michael Marxmeier mike@msede.com

--- linux/fs/partitions/check.c.orig	Sun Feb 27 15:33:55 2000
+++ linux/fs/partitions/check.c	Sun Feb 27 15:45:44 2000
@@ -71,6 +71,11 @@
 	NULL
 };
 
+#if defined CONFIG_BLK_DEV_LVM || defined CONFIG_BLK_DEV_LVM_MODULE
+#include <linux/lvm.h>
+void ( *lvm_hd_name_ptr) ( char *, int) = NULL;
+#endif
+
 /*
  * disk_name() is used by genhd.c and blkpg.c.
  * It formats the devicename of the indicated disk into
@@ -149,6 +154,14 @@
  			sprintf(buf, "%s/c%dd%dp%d", maj, ctlr, disk, part);
  		return buf;
  	}
+#if defined CONFIG_BLK_DEV_LVM || defined CONFIG_BLK_DEV_LVM_MODULE
+	if (hd->major == LVM_BLK_MAJOR) {
+		*buf = 0;
+		if ( lvm_hd_name_ptr != NULL)
+			( lvm_hd_name_ptr) ( buf, minor);
+		return buf;
+	}
+#endif
 	if (part)
 		sprintf(buf, "%s%c%d", maj, unit, part);
 	else
--- linux/fs/block_dev.c.orig	Sun Feb 27 15:22:21 2000
+++ linux/fs/block_dev.c	Sun Feb 27 15:22:52 2000
@@ -313,7 +313,7 @@
  *	since the vma has no handle.
  */
  
-static int block_fsync(struct file *filp, struct dentry *dentry)
+int block_fsync(struct file *filp, struct dentry *dentry)
 {
 	return fsync_dev(dentry->d_inode->i_rdev);
 }
@@ -650,7 +650,7 @@
 	return ret;
 }
 
-static int blkdev_close(struct inode * inode, struct file * filp)
+int blkdev_close(struct inode * inode, struct file * filp)
 {
 	return blkdev_put(inode->i_bdev, BDEV_FILE);
 }
--- linux/kernel/ksyms.c.orig	Sun Feb 27 15:23:10 2000
+++ linux/kernel/ksyms.c	Sun Feb 27 15:48:58 2000
@@ -71,6 +71,10 @@
 };
 #endif
 
+#ifdef CONFIG_BLK_DEV_LVM_MODULE
+extern void (*lvm_hd_name_ptr) ( char*, int);
+EXPORT_SYMBOL(lvm_hd_name_ptr);
+#endif
 
 #ifdef CONFIG_KMOD
 EXPORT_SYMBOL(request_module);
@@ -232,6 +236,7 @@
 EXPORT_SYMBOL(page_follow_link);
 EXPORT_SYMBOL(page_symlink_inode_operations);
 EXPORT_SYMBOL(block_symlink);
+EXPORT_SYMBOL(block_fsync);
 
 /* for stackable file systems (lofs, wrapfs, etc.) */
 EXPORT_SYMBOL(add_to_page_cache);
@@ -267,6 +272,7 @@
 EXPORT_SYMBOL(sync_dev);
 EXPORT_SYMBOL(devfs_register_partitions);
 EXPORT_SYMBOL(blkdev_open);
+EXPORT_SYMBOL(blkdev_close);
 EXPORT_SYMBOL(blkdev_get);
 EXPORT_SYMBOL(blkdev_put);
 EXPORT_SYMBOL(ioctl_by_bdev);
--- linux/include/linux/fs.h.orig	Sun Feb 27 15:24:13 2000
+++ linux/include/linux/fs.h	Sun Feb 27 15:24:35 2000
@@ -796,6 +796,8 @@
 extern struct block_device *bdget(dev_t);
 extern void bdput(struct block_device *);
 extern int blkdev_open(struct inode *, struct file *);
+extern int blkdev_close(struct inode * inode, struct file * filp);
+extern int block_fsync(struct file *filp, struct dentry *dentry);
 extern struct file_operations def_blk_fops;
 extern struct file_operations def_fifo_fops;
 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
--- linux/include/linux/blk.h.orig	Sun Feb 27 15:33:22 2000
+++ linux/include/linux/blk.h	Sun Feb 27 15:33:39 2000
@@ -51,6 +51,7 @@
 extern int xd_init(void);
 extern int mfm_init(void);
 extern int loop_init(void);
+extern int lvm_init(void);
 extern int md_init(void);
 extern int ap_init(void);
 extern int ddv_init(void);
--- linux/drivers/block/Config.in.orig	Sun Feb 27 15:10:27 2000
+++ linux/drivers/block/Config.in	Sun Feb 27 15:12:28 2000
@@ -205,6 +205,12 @@
 if [ "$CONFIG_NET" = "y" ]; then
    tristate 'Network block device support' CONFIG_BLK_DEV_NBD
 fi
+
+tristate 'Logical volume manager (LVM) support' CONFIG_BLK_DEV_LVM N
+if [ "$CONFIG_BLK_DEV_LVM" != "n" ]; then
+   bool '   LVM information in proc filesystem' CONFIG_LVM_PROC_FS Y
+fi
+
 bool 'Multiple devices driver support' CONFIG_BLK_DEV_MD
 if [ "$CONFIG_BLK_DEV_MD" = "y" ]; then
    tristate '  Linear (append) mode' CONFIG_MD_LINEAR
--- linux/drivers/block/ll_rw_blk.c.orig	Sun Feb 27 15:32:36 2000
+++ linux/drivers/block/ll_rw_blk.c	Sun Feb 27 15:32:57 2000
@@ -1239,6 +1239,9 @@
 #ifdef CONFIG_SJCD
 	sjcd_init();
 #endif CONFIG_SJCD
+#ifdef CONFIG_BLK_DEV_LVM
+	lvm_init();
+#endif
 #ifdef CONFIG_BLK_DEV_MD
 	md_init();
 #endif CONFIG_BLK_DEV_MD
--- linux/drivers/block/lvm.c.orig	Sun Feb 27 15:50:05 2000
+++ linux/drivers/block/lvm.c	Sun Feb 27 15:50:18 2000
@@ -287,7 +287,7 @@
 static char pv_name[NAME_LEN];
 /* static char rootvg[NAME_LEN] = { 0, }; */
 static uint lv_open = 0;
-static const char *const lvm_name = LVM_NAME;
+const char *const lvm_name = LVM_NAME;
 static int lock = 0;
 static int loadtime = 0;
 static uint vg_count = 0;