diff --git a/lib/Makefile.in b/lib/Makefile.in
index e5e3edb11..03f466a32 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -22,7 +22,8 @@ VPATH = @srcdir@
 
 SOURCES=\
 	config/config.c \
-	dev-mgr/dev-manager.c \
+	datastruct/hash.c \
+	dev-mgr/dev-cache.c \
 	device/device.c \
 	display/display.c \
 	display/metadata.c \
diff --git a/lib/datastruct/hash.c b/lib/datastruct/hash.c
index 7c5ae5732..c750e3b7a 100644
--- a/lib/datastruct/hash.c
+++ b/lib/datastruct/hash.c
@@ -5,8 +5,8 @@
  */
 
 
-#include "hash.h"
 #include "dbg_malloc.h"
+#include "hash.h"
 #include "log.h"
 
 struct hash_node {
@@ -68,7 +68,7 @@ static unsigned _hash(const char *str)
 	return h;
 }
 
-hash_table_t create_hash_table(unsigned size_hint)
+struct hash_table *create_hash_table(unsigned size_hint)
 {
 	size_t len;
 	unsigned new_size = 16u;
@@ -92,7 +92,7 @@ hash_table_t create_hash_table(unsigned size_hint)
 		goto bad;
 	}
 	memset(hc->slots, 0, len);
-	return (hash_table_t) hc;
+	return (struct hash_table) hc;
 
  bad:
 	dbg_free(hc->slots);
diff --git a/lib/dev-mgr/dev-cache.h b/lib/dev-mgr/dev-cache.h
index e0f5efee8..074bee0d4 100644
--- a/lib/dev-mgr/dev-cache.h
+++ b/lib/dev-mgr/dev-cache.h
@@ -7,6 +7,8 @@
 #ifndef _LVM_DEV_CACHE_H
 #define _LVM_DEV_CACHE_H
 
+#include <sys/types.h>
+
 /*
  * All devices in LVM will be represented by one of these.
  * pointer comparisons are valid.
@@ -17,7 +19,7 @@ struct device {
 };
 
 struct dev_filter {
-	int (*passes_filter)(struct dev_cache_filter *f, struct device *dev);
+	int (*passes_filter)(struct dev_filter *f, struct device *dev);
 	void *private;
 };
 
@@ -45,7 +47,7 @@ struct device *dev_iter_get(struct dev_iter *iter);
  * All io should use these routines, rather than opening the devices
  * by hand.  You do not have to call an open routine.
  */
-uint64_t dev_get_size(struct device *dev); /* in 512 byte sectors */
+__uint64_t dev_get_size(struct device *dev); /* in 512 byte sectors */
 ssize_t dev_read(struct device *dev, size_t offset, size_t len, void *buffer);
 ssize_t dev_write(struct device *dev, size_t offset, size_t len, void *buffer);
 
diff --git a/lib/device/device.c b/lib/device/device.c
index 061435183..87ad84c4c 100644
--- a/lib/device/device.c
+++ b/lib/device/device.c
@@ -30,7 +30,7 @@
 
 #include "dbg_malloc.h"
 #include "log.h"
-#include "dev-manager.h"
+#include "dev-cache.h"
 #include "metadata.h"
 #include "device.h"
 
diff --git a/lib/metadata/metadata.h b/lib/metadata/metadata.h
index 33ed0411b..fedfca18f 100644
--- a/lib/metadata/metadata.h
+++ b/lib/metadata/metadata.h
@@ -3,19 +3,47 @@
  *
  * This file is released under the GPL.
  *
- * This is the in core representation of a volume group and it's
+ * This is the in core representation of a volume group and its
  * associated physical and logical volumes.
  */
 
 #ifndef _LVM_METADATA_H
 #define _LVM_METADATA_H
 
+#include <sys/types.h>
 #include "dev-cache.h"
 
 #define ID_LEN 32
 
+
+/* Various flags */
+/* Note that the bits no longer necessarily correspond to LVM1 disk format */
+
+#define STATUS_ACTIVE            0x01  /* PV VG LV */
+
+#define STATUS_EXPORTED          0x02  /* VG */
+#define STATUS_EXTENDABLE        0x04  /* VG */
+
+#define STATUS_ALLOCATED         0x02  /* PV */
+
+#define STATUS_SPINDOWN          0x02  /* LV */
+#define STATUS_BADBLOCK_ON       0x04  /* LV */
+#define STATUS_ALLOC_STRICT      0x08  /* LV */
+#define STATUS_ALLOC_CONTIGUOUS  0x10  /* LV */
+
+#define ACCESS_READ              0x01  /* LV VG */
+#define ACCESS_WRITE             0x02  /* LV VG */
+
+#define ACCESS_SNAPSHOT          0x04  /* LV */
+#define ACCESS_SNAPSHOT_ORG      0x08  /* LV */
+
+#define ACCESS_CLUSTERED         0x04  /* VG */
+#define ACCESS_SHARED            0x08  /* VG */
+
+
+
 struct id {
-	uint8_t chars[ID_LEN];
+	__uint8_t chars[ID_LEN];
 };
 
 struct logical_volume;
@@ -25,19 +53,19 @@ struct physical_volume {
 	struct device *dev;
 	char *vg_name;
 
-        uint32_t status;
-        uint64_t size;
+        __uint32_t status;
+        __uint64_t size;
 
         /* physical extents */
-        uint64_t pe_size;
-        uint64_t pe_start;
-        uint32_t pe_count;
-        uint32_t pe_allocated;
+        __uint64_t pe_size;
+        __uint64_t pe_start;
+        __uint32_t pe_count;
+        __uint32_t pe_allocated;
 };
 
 struct pe_specifier {
         struct physical_volume *pv;
-        uint32_t pe;
+        __uint32_t pe;
 };
 
 struct logical_volume {
@@ -45,12 +73,12 @@ struct logical_volume {
 	struct id *id;
         char *name;
 
-        uint32_t access;
-        uint32_t status;
-        uint32_t open;
+        __uint32_t access;
+        __uint32_t status;
+        __uint32_t open;
 
-        uint64_t size;
-        uint32_t le_count;
+        __uint64_t size;
+        __uint32_t le_count;
 
         /* le -> pe mapping array */
         struct pe_specifier *map;
@@ -60,76 +88,62 @@ struct volume_group {
 	struct id *id;
 	char *name;
 
-        uint64_t extent_size;
-        uint32_t extent_count;
-        uint32_t free_count;
+        __uint64_t extent_size;
+        __uint32_t extent_count;
+        __uint32_t free_count;
 
         /* physical volumes */
-        uint32_t pv_count;
+        __uint32_t pv_count;
         struct physical_volume **pv;
 
         /* logical volumes */
-        uint32_t lv_count;
+        __uint32_t lv_count;
         struct logical_volume **lv;
 };
 
+
 /* ownership of returned objects passes */
 struct io_space {
 	struct str_list *(*get_vgs)(struct io_space *is);
 	struct dev_list *(*get_pvs)(struct io_space *is);
 
-	struct physical_volume *pv_read(struct io_space *is,
+	struct physical_volume *(*pv_read)(struct io_space *is,
 					struct device *dev);
-	int pv_write(struct io_space *is, struct physical_volume *pv);
+	int (*pv_write)(struct io_space *is, struct physical_volume *pv);
 
 	struct volume_group *(*vg_read)(struct io_space *is,
 					const char *vg_name);
 	int (*vg_write)(struct io_space *is, struct volume_group *vg);
-	void (*destructor)(struct io_space *is);
+	void (*destroy)(struct io_space *is);
 
 	struct dev_filter *filter;
 	void *private;
 };
 
-struct io_space *create_text_format(struct device_manager *mgr,
+/* FIXME: Move to other files */
+struct io_space *create_text_format(struct dev_filter *filter,
 				    const char *text_file);
+struct io_space *create_lvm_v1_format(struct dev_filter *filter);
 
-inline struct volume_group *read_vg(struct io_space *f)
-{
-	struct dev_list *pvs = f->get_pvs();
-	return f->read_vg(pvs);
-}
-
-inline int write_vg(struct io_object *f, struct volume_group *vg)
-{
-	return f->write_vg(vg);
-}
-
-
-
-inline int write_backup(struct io_format *orig, struct io_format *text)
+inline int write_backup(struct io_space *orig, struct io_space *text)
 {
 
 }
 
 
-
 int id_eq(struct id *op1, struct id *op2);
 
-struct volume_group *create_vg();
-int destroy_vg(struct volume_group *vg);
+struct volume_group *vg_create();
+struct physical_volume *pv_create();
 
-int add_pv(struct volume_group *vg, struct physical_volume *pv);
-struct physical_volume *find_pv(struct volume_group *vg,
+int vg_destroy(struct volume_group *vg);
+
+int pv_add(struct volume_group *vg, struct physical_volume *pv);
+struct physical_volume *pv_find(struct volume_group *vg,
 				struct physical_volume *pv);
 
-int add_lv(struct volume_group *vg, struct logical_volume *lv);
-struct logical_volume *find_lv(struct volume_group *vg,
+int lv_add(struct volume_group *vg, struct logical_volume *lv);
+struct logical_volume *lv_find(struct volume_group *vg,
 			       struct logical_volume *lv);
 
-struct io_handler {
-	struct volume_group *read_vg();
-	int write_vg(struct volume_group *vg);
-};
-
 #endif
diff --git a/lib/mm/dbg_malloc.h b/lib/mm/dbg_malloc.h
index 68de7168e..49ca4d4b5 100644
--- a/lib/mm/dbg_malloc.h
+++ b/lib/mm/dbg_malloc.h
@@ -21,6 +21,8 @@
 #ifndef _LVM_DBG_MALLOC_H
 #define _LVM_DBG_MALLOC_H
 
+#include <sys/types.h>
+
 #ifdef DEBUG_MEM
 void *malloc_aux(size_t s, const char *file, int line);
 void free_aux(void *p);
diff --git a/tools/Makefile.in b/tools/Makefile.in
index 44604f572..7c51ca1a5 100644
--- a/tools/Makefile.in
+++ b/tools/Makefile.in
@@ -22,8 +22,9 @@ VPATH = @srcdir@
 
 SOURCES=\
 	lvm.c\
-	lvactivate.c\
-	pvdisplay.c
+	pvcreate.c\
+	pvdisplay.c\
+	lvactivate.c
 
 TARGETS=\
 	lvm
diff --git a/tools/lvactivate.c b/tools/lvactivate.c
index 7ed3e98bb..30786ffea 100644
--- a/tools/lvactivate.c
+++ b/tools/lvactivate.c
@@ -24,38 +24,38 @@ int lvactivate(int argc, char **argv)
 {
 	int p;
 
-	struct dev_mgr *dm;
+	struct io_space *ios;
 	struct device *pv_dev;
 
-	char *lv;
+	char *lv_name;
 	char *pv_name;
 
-	pv_t *pv = NULL;
-	lv_disk_t *lvs = NULL;
+	struct physical_volume *pv = NULL;
+	struct logical_volume *lv = NULL;
 
 	if (argc < 2) {
 		log_error("please enter logical volume & physical volume(s)");
 		return LVM_EINVALID_CMD_LINE;
 	}
 
-	lv = argv[0];
+	lv_name = argv[0];
 	argc--;
 	argv++;
 
-	dm = active_dev_mgr();
+	ios = active_ios();
 
 	while (argc--) {
 		pv_name = argv[argc];
-		if (!(pv_dev = dev_by_name(dm, pv_name))) {
+		if (!(pv_dev = dev_cache_get(pv_name))) {
 			log_error("device \"%s\" not found", pv_name);
 			return -1;
 		}
 
-		if (!(pv = pv_read(dm, pv_name))) {
+		if (!(pv = pv_read(ios, pv_dev))) {
 			return -1;
 		}
 
-		if (pv->pe_allocated) {
+		if (pv->status & STATUS_ALLOCATED) {
 			if (!(pv->pe = pv_read_pe(pv_name, pv)))
 				goto pvdisplay_device_out;
 			if (!(lvs = pv_read_lvs(pv))) {
diff --git a/tools/lvm.c b/tools/lvm.c
index e52d77d41..13cdc7149 100644
--- a/tools/lvm.c
+++ b/tools/lvm.c
@@ -59,6 +59,7 @@ static int _num_commands;
 static struct command *_commands;
 
 static struct dev_filter *_filter;
+static struct io_space *_ios;
 static struct config_file *_cf;
 
 static int _interactive;
@@ -211,10 +212,10 @@ int string_arg(struct arg *a)
 int permission_arg(struct arg *a)
 {
 	if ((!strcmp(a->value, "rw")) || (!strcmp(a->value, "wr")))
-		a->i_value = LV_READ | LV_WRITE;
+		a->i_value = ACCESS_READ | ACCESS_WRITE;
 
 	else if (!strcmp(a->value, "r"))
-		a->i_value = LV_READ;
+		a->i_value = ACCESS_READ;
 
 	else
 		return 0;
@@ -447,8 +448,8 @@ static int process_common_commands(struct command *com)
 	}
 
 	if (arg_count(version_ARG)) {
-		/* FIXME: Add driver version */
-		log_error("%s: %s", com->name, lvm_version);
+		/* FIXME: Add driver and software version */
+		log_error("%s: ", com->name);
 		return LVM_ECMD_PROCESSED;
 	}
 
@@ -548,6 +549,14 @@ struct config_file *active_config_file(void) {
 	return _cf;
 }
 
+struct dev_filter *active_filter(void) {
+	return _filter;
+}
+
+struct io_space *active_ios(void) {
+	return _ios;
+}
+
 static void __init_log(struct config_file *cf)
 {
 	const char *log_file = find_config_str(cf->root, "log/file", '/', 0);
@@ -601,6 +610,10 @@ static int init(void)
 		goto out;
 	}
 
+	if (!(_ios = create_lvm_v1_format(_filter))) {
+		goto out;
+	}
+
 	ret = 1;
 
       out:
@@ -619,6 +632,7 @@ static void __fin_commands(void)
 
 static void fin(void)
 {
+	_ios->destroy(_ios);
 	config_filter_destroy(_filter);
 	dev_cache_exit();
 	destroy_config_file(_cf);
diff --git a/tools/pvcreate.c b/tools/pvcreate.c
index b38073e35..810e1bfe9 100644
--- a/tools/pvcreate.c
+++ b/tools/pvcreate.c
@@ -45,42 +45,36 @@ int pvcreate(int argc, char **argv)
 void pvcreate_single(const char *pv_name)
 {
 	int size;
-	pv_t *pv = NULL;
-	pv_t *pv_new;
+	struct physical_volume *pv = NULL;
 
-	struct dev_mgr *dm;
+	struct io_space *ios;
 	struct device *pv_dev;
 
-	dm = active_dev_mgr();
+	ios = active_ios();
 
-	if (!(pv_dev = dev_by_name(dm, pv_name))) {
+	if (!(pv_dev = dev_cache_get(pv_name))) {
 		log_error("Device %s not found", pv_name);
 		return;
 	}
 
-	if ((size = device_get_size(pv_name)) < 0) {
+	if ((size = dev_get_size(pv_dev)) < 0) {
 		log_error("Unable to get size of %s", pv_name);
 		return;
 	}
 
-	if (arg_count(force_ARG) < 1 && !partition_type_is_lvm(dm, pv_dev)) {
+	if (arg_count(force_ARG) < 1 && !partition_type_is_lvm(ios, pv_dev)) {
 		return;
 	}
 
-	if (!(pv = pv_read(dm, pv_name))) {
+	pv = ios->pv_read(ios, pv_dev);
+
+	if (pv && (pv->status & STATUS_EXPORTED)) {
+		log_error ("Physical volume %s belongs to exported volume"
+			   " group %s", pv_name, pv->vg_name);
 		return;
 	}
 
-/****
-	FIXME: Check attributes
-
-	EXPORTED
-	pv->vg_name[strlen(pv->vg_name) - strlen(EXPORTED)] = 0;
-	log_error ("physical volume \"%s\" belongs to exported volume group \"%s\"",
-	pv_name, pv->vg_name);
-*****/
-
-	if (pv->vg_name[0]) {
+	if (pv && pv->vg_name[0]) {
 		if (arg_count(force_ARG) < 2) {
 			log_error("Can't initialize physical volume %s of "
 				  "volume group %s without -ff", pv_name,
@@ -99,18 +93,20 @@ void pvcreate_single(const char *pv_name)
 		}
 
 	}
-/***
 
-	if (pv) {
-		if (pv_check_active((char *) pv->vg_name, (char *) pv_name) ==
-		    TRUE) {
-			log_error
-			    ("can't force create on active physical volume \"%s\"",
-			     pv_name);
+	if (pv && (pv->status & STATUS_ACTIVE)) {
+		log_error("Can't create on active physical volume %s",
+			  pv_name);
+		return;
+	}
+
+
+	if (!pv) {
+		if (!(pv = pv_create()))
 			return;
-		}
-
-***/
+		/* FIXME: Set up initial size & PEs here */
+	}
+	
 
 	if (arg_count(force_ARG)) {
 		/* FIXME: Change to log_print */
@@ -127,20 +123,13 @@ void pvcreate_single(const char *pv_name)
 	log_verbose("setting up physical volume for %s with %u sectors",
 		    pv_name, size);
 
-/*** FIXME: New metadata creation fn reqd
-	if (!(pv_new = pv_setup_for_create(pv_name, size)) < 0) {
-		log_error("Failed to set up  physical volume %s", pv_name);
-		return;
-	}
-***/
 
 	log_verbose("writing physical volume data to disk %s", pv_name);
 
-/*** FIXME: New metadata write fn reqd
-	if (!(pv_write(pv_name, pv_new)) == 0) {
+	if (!(pv_write(ios, pv))) {
 		log_error("Failed to create physical volume %s", pv_name);
+		return;
 	}
-***/
 
 	printf("physical volume %s successfully created\n", pv_name);