Index: uspace/srv/clip/clip.c
===================================================================
--- uspace/srv/clip/clip.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/clip/clip.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -64,6 +64,6 @@
 		ipc_answer_0(rid, EOK);
 		break;
-	case CLIPBOARD_TAG_BLOB:
-		rc = async_data_blob_receive(&data, 0, &size);
+	case CLIPBOARD_TAG_DATA:
+		rc = async_data_write_accept((void **) &data, false, 0, 0, 0, &size);
 		if (rc != EOK) {
 			ipc_answer_0(rid, rc);
@@ -78,5 +78,5 @@
 		clip_data = data;
 		clip_size = size;
-		clip_tag = CLIPBOARD_TAG_BLOB;
+		clip_tag = CLIPBOARD_TAG_DATA;
 		
 		fibril_mutex_unlock(&clip_mtx);
@@ -97,5 +97,5 @@
 	/* Check for clipboard data tag compatibility */
 	switch (IPC_GET_ARG1(*request)) {
-	case CLIPBOARD_TAG_BLOB:
+	case CLIPBOARD_TAG_DATA:
 		if (!async_data_read_receive(&callid, &size)) {
 			ipc_answer_0(callid, EINVAL);
@@ -104,6 +104,6 @@
 		}
 		
-		if (clip_tag != CLIPBOARD_TAG_BLOB) {
-			/* So far we only understand BLOB */
+		if (clip_tag != CLIPBOARD_TAG_DATA) {
+			/* So far we only understand binary data */
 			ipc_answer_0(callid, EOVERFLOW);
 			ipc_answer_0(rid, EOVERFLOW);
Index: uspace/srv/devmap/devmap.c
===================================================================
--- uspace/srv/devmap/devmap.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/devmap/devmap.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -396,5 +396,6 @@
 	 * Get driver name
 	 */
-	int rc = async_data_string_receive(&driver->name, DEVMAP_NAME_MAXLEN);
+	int rc = async_data_write_accept((void **) &driver->name, true, 0,
+	    DEVMAP_NAME_MAXLEN, 0, NULL);
 	if (rc != EOK) {
 		free(driver);
@@ -510,5 +511,6 @@
 	/* Get fqdn */
 	char *fqdn;
-	int rc = async_data_string_receive(&fqdn, DEVMAP_NAME_MAXLEN);
+	int rc = async_data_write_accept((void **) &fqdn, true, 0,
+	    DEVMAP_NAME_MAXLEN, 0, NULL);
 	if (rc != EOK) {
 		free(device);
@@ -622,5 +624,6 @@
 	
 	/* Get fqdn */
-	int rc = async_data_string_receive(&fqdn, DEVMAP_NAME_MAXLEN);
+	int rc = async_data_write_accept((void **) &fqdn, true, 0,
+	    DEVMAP_NAME_MAXLEN, 0, NULL);
 	if (rc != EOK) {
 		ipc_answer_0(iid, rc);
@@ -683,5 +686,6 @@
 	
 	/* Get device name */
-	int rc = async_data_string_receive(&name, DEVMAP_NAME_MAXLEN);
+	int rc = async_data_write_accept((void **) &name, true, 0,
+	    DEVMAP_NAME_MAXLEN, 0, NULL);
 	if (rc != EOK) {
 		ipc_answer_0(iid, rc);
Index: uspace/srv/fs/devfs/devfs_ops.c
===================================================================
--- uspace/srv/fs/devfs/devfs_ops.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/fs/devfs/devfs_ops.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -419,5 +419,6 @@
 	
 	/* Accept the mount options */
-	ipcarg_t retval = async_data_string_receive(&opts, 0);
+	ipcarg_t retval = async_data_write_accept((void **) &opts, true, 0, 0,
+	    0, NULL);
 	if (retval != EOK) {
 		ipc_answer_0(rid, retval);
Index: uspace/srv/fs/fat/fat_ops.c
===================================================================
--- uspace/srv/fs/fat/fat_ops.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/fs/fat/fat_ops.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -974,27 +974,13 @@
 	uint16_t bps;
 	uint16_t rde;
-	int rc;
-
-	/* accept the mount options */
-	ipc_callid_t callid;
-	size_t size;
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *opts = malloc(size + 1);
-	if (!opts) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	ipcarg_t retval = async_data_write_finalize(callid, opts, size);
-	if (retval != EOK) {
-		ipc_answer_0(rid, retval);
-		free(opts);
-		return;
-	}
-	opts[size] = '\0';
+	
+	/* Accept the mount options */
+	char *opts;
+	int rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
+	
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
 
 	/* Check for option enabling write through. */
Index: uspace/srv/fs/tmpfs/tmpfs_ops.c
===================================================================
--- uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -443,30 +443,14 @@
 	fs_node_t *rootfn;
 	int rc;
-
-	/* accept the mount options */
-	ipc_callid_t callid;
-	size_t size;
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *opts = malloc(size + 1);
-	if (!opts) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	ipcarg_t retval = async_data_write_finalize(callid, opts, size);
-	if (retval != EOK) {
-		ipc_answer_0(rid, retval);
-		free(opts);
-		return;
-	}
-	opts[size] = '\0';
-
-	/*
-	 * Check if this device is not already mounted.
-	 */
+	
+	/* Accept the mount options. */
+	char *opts;
+	rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
+
+	/* Check if this device is not already mounted. */
 	rc = tmpfs_root_get(&rootfn, dev_handle);
 	if ((rc == EOK) && (rootfn)) {
Index: uspace/srv/hid/console/console.c
===================================================================
--- uspace/srv/hid/console/console.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/hid/console/console.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -475,20 +475,12 @@
 static void cons_write(console_t *cons, ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
+	void *buf;
 	size_t size;
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
+	int rc = async_data_write_accept(&buf, false, 0, 0, 0, &size);
+	
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
 		return;
 	}
-	
-	char *buf = (char *) malloc(size);
-	if (buf == NULL) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	(void) async_data_write_finalize(callid, buf, size);
 	
 	async_serialize_start();
Index: uspace/srv/hid/kbd/port/i8042.h
===================================================================
--- uspace/srv/hid/kbd/port/i8042.h	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ 	(revision )
@@ -1,55 +1,0 @@
-/*
- * Copyright (c) 2006 Josef Cejka
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- *   notice, this list of conditions and the following disclaimer in the
- *   documentation and/or other materials provided with the distribution.
- * - The name of the author may not be used to endorse or promote products
- *   derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/** @addtogroup kbd_port
- * @ingroup  kbd
- * @{
- */
-
-/** @file
- * @brief i8042 port driver.
- */
-
-#ifndef KBD_PORT_i8042_H_
-#define KBD_PORT_i8042_H_
-
-#include <libarch/ddi.h>
-#include <libarch/types.h>
-
-struct i8042 {
-	ioport8_t data;
-	uint8_t pad[3];
-	ioport8_t status;
-} __attribute__ ((packed));
-typedef struct i8042 i8042_t;
-
-#endif
-
-/**
- * @}
- */ 
Index: uspace/srv/loader/main.c
===================================================================
--- uspace/srv/loader/main.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/loader/main.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -125,24 +125,15 @@
 static void ldr_set_cwd(ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
-	size_t len;
-	
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	cwd = malloc(len + 1);
-	if (!cwd) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	async_data_write_finalize(callid, cwd, len);
-	cwd[len] = '\0';
-	
-	ipc_answer_0(rid, EOK);
+	char *buf;
+	int rc = async_data_write_accept((void **) &buf, true, 0, 0, 0, NULL);
+	
+	if (rc == EOK) {
+		if (cwd != NULL)
+			free(cwd);
+		
+		cwd = buf;
+	}
+	
+	ipc_answer_0(rid, rc);
 }
 
@@ -154,31 +145,15 @@
 static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
-	size_t len;
-	char *name_buf;
-	
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	name_buf = malloc(len + 1);
-	if (!name_buf) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	async_data_write_finalize(callid, name_buf, len);
-	ipc_answer_0(rid, EOK);
-	
-	if (pathname != NULL) {
-		free(pathname);
-		pathname = NULL;
-	}
-	
-	name_buf[len] = '\0';
-	pathname = name_buf;
+	char *buf;
+	int rc = async_data_write_accept((void **) &buf, true, 0, 0, 0, NULL);
+	
+	if (rc == EOK) {
+		if (pathname != NULL)
+			free(pathname);
+		
+		pathname = buf;
+	}
+	
+	ipc_answer_0(rid, rc);
 }
 
@@ -190,73 +165,60 @@
 static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
-	size_t buf_size, arg_size;
-	char *p;
-	int n;
-	
-	if (!async_data_write_receive(&callid, &buf_size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	if (arg_buf != NULL) {
-		free(arg_buf);
-		arg_buf = NULL;
-	}
-	
-	if (argv != NULL) {
-		free(argv);
-		argv = NULL;
-	}
-	
-	arg_buf = malloc(buf_size + 1);
-	if (!arg_buf) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	async_data_write_finalize(callid, arg_buf, buf_size);
-	
-	arg_buf[buf_size] = '\0';
-	
-	/*
-	 * Count number of arguments
-	 */
-	p = arg_buf;
-	n = 0;
-	while (p < arg_buf + buf_size) {
-		arg_size = str_size(p);
-		p = p + arg_size + 1;
-		++n;
-	}
-	
-	/* Allocate argv */
-	argv = malloc((n + 1) * sizeof(char *));
-	
-	if (argv == NULL) {
-		free(arg_buf);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-
-	/*
-	 * Fill argv with argument pointers
-	 */
-	p = arg_buf;
-	n = 0;
-	while (p < arg_buf + buf_size) {
-		argv[n] = p;
-		
-		arg_size = str_size(p);
-		p = p + arg_size + 1;
-		++n;
-	}
-	
-	argc = n;
-	argv[n] = NULL;
-
-	ipc_answer_0(rid, EOK);
+	char *buf;
+	size_t buf_size;
+	int rc = async_data_write_accept((void **) &buf, true, 0, 0, 0, &buf_size);
+	
+	if (rc == EOK) {
+		/*
+		 * Count number of arguments
+		 */
+		char *cur = buf;
+		int count = 0;
+		
+		while (cur < buf + buf_size) {
+			size_t arg_size = str_size(cur);
+			cur += arg_size + 1;
+			count++;
+		}
+		
+		/*
+		 * Allocate new argv
+		 */
+		char **_argv = (char **) malloc((count + 1) * sizeof(char *));
+		if (_argv == NULL) {
+			free(buf);
+			ipc_answer_0(rid, ENOMEM);
+			return;
+		}
+		
+		/*
+		 * Fill the new argv with argument pointers
+		 */
+		cur = buf;
+		count = 0;
+		while (cur < buf + buf_size) {
+			_argv[count] = cur;
+			
+			size_t arg_size = str_size(cur);
+			cur += arg_size + 1;
+			count++;
+		}
+		_argv[count] = NULL;
+		
+		/*
+		 * Copy temporary data to global variables
+		 */
+		if (arg_buf != NULL)
+			free(arg_buf);
+		
+		if (argv != NULL)
+			free(argv);
+		
+		argc = count;
+		arg_buf = buf;
+		argv = _argv;
+	}
+	
+	ipc_answer_0(rid, rc);
 }
 
@@ -268,57 +230,44 @@
 static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
+	fdi_node_t *buf;
 	size_t buf_size;
-	if (!async_data_write_receive(&callid, &buf_size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	if ((buf_size % sizeof(fdi_node_t)) != 0) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	if (fil_buf != NULL) {
-		free(fil_buf);
-		fil_buf = NULL;
-	}
-	
-	if (filv != NULL) {
-		free(filv);
-		filv = NULL;
-	}
-	
-	fil_buf = malloc(buf_size);
-	if (!fil_buf) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	async_data_write_finalize(callid, fil_buf, buf_size);
-	
-	int count = buf_size / sizeof(fdi_node_t);
-	
-	/* Allocate filvv */
-	filv = malloc((count + 1) * sizeof(fdi_node_t *));
-	
-	if (filv == NULL) {
-		free(fil_buf);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	/*
-	 * Fill filv with argument pointers
-	 */
-	int i;
-	for (i = 0; i < count; i++)
-		filv[i] = &fil_buf[i];
-	
-	filc = count;
-	filv[count] = NULL;
+	int rc = async_data_write_accept((void **) &buf, false, 0, 0,
+	    sizeof(fdi_node_t), &buf_size);
+	
+	if (rc == EOK) {
+		int count = buf_size / sizeof(fdi_node_t);
+		
+		/*
+		 * Allocate new filv
+		 */
+		fdi_node_t **_filv = (fdi_node_t *) malloc((count + 1) * sizeof(fdi_node_t *));
+		if (_filv == NULL) {
+			free(buf);
+			ipc_answer_0(rid, ENOMEM);
+			return;
+		}
+		
+		/*
+		 * Fill the new filv with argument pointers
+		 */
+		int i;
+		for (i = 0; i < count; i++)
+			_filv[i] = &buf[i];
+		
+		_filv[count] = NULL;
+		
+		/*
+		 * Copy temporary data to global variables
+		 */
+		if (fil_buf != NULL)
+			free(fil_buf);
+		
+		if (filv != NULL)
+			free(filv);
+		
+		filc = count;
+		fil_buf = buf;
+		filv = _filv;
+	}
 	
 	ipc_answer_0(rid, EOK);
Index: uspace/srv/vfs/vfs_ops.c
===================================================================
--- uspace/srv/vfs/vfs_ops.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/vfs/vfs_ops.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -266,118 +266,36 @@
 	
 	/* We want the client to send us the mount point. */
-	ipc_callid_t callid;
-	size_t size;
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	/* Check whether size is reasonable wrt. the mount point. */
-	if ((size < 1) || (size > MAX_PATH_LEN)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	/* Allocate buffer for the mount point data being received. */
-	char *mp = malloc(size + 1);
-	if (!mp) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	/* Deliver the mount point. */
-	ipcarg_t retval = async_data_write_finalize(callid, mp, size);
-	if (retval != EOK) {
-		ipc_answer_0(rid, retval);
+	char *mp;
+	int rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
+	    0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
+	/* Now we expect to receive the mount options. */
+	char *opts;
+	rc = async_data_write_accept((void **) &opts, true, 0, MAX_MNTOPTS_LEN,
+	    0, NULL);
+	if (rc != EOK) {
 		free(mp);
-		return;
-	}
-	mp[size] = '\0';
-	
-	/* Now we expect to receive the mount options. */
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		free(mp);
-		return;
-	}
-
-	/* Check the offered options size. */
-	if (size > MAX_MNTOPTS_LEN) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		free(mp);
-		return;
-	}
-
-	/* Allocate buffer for the mount options. */
-	char *opts = (char *) malloc(size + 1);
-	if (!opts) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		free(mp);
-		return;
-	}
-
-	/* Deliver the mount options. */
-	retval = async_data_write_finalize(callid, opts, size);
-	if (retval != EOK) {
-		ipc_answer_0(rid, retval);
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
+	/*
+	 * Now, we expect the client to send us data with the name of the file
+	 * system.
+	 */
+	char *fs_name;
+	rc = async_data_write_accept((void **) &fs_name, true, 0, FS_NAME_MAXLEN,
+	    0, NULL);
+	if (rc != EOK) {
 		free(mp);
 		free(opts);
-		return;
-	}
-	opts[size] = '\0';
-	
-	/*
-	 * Now, we expect the client to send us data with the name of the file
-	 * system.
-	 */
-	if (!async_data_write_receive(&callid, &size)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		free(mp);
-		free(opts);
-		return;
-	}
-	
-	/*
-	 * Don't receive more than is necessary for storing a full file system
-	 * name.
-	 */
-	if ((size < 1) || (size > FS_NAME_MAXLEN)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		free(mp);
-		free(opts);
-		return;
-	}
-	
-	/*
-	 * Allocate buffer for file system name.
-	 */
-	char *fs_name = (char *) malloc(size + 1);
-	if (fs_name == NULL) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		free(mp);
-		free(opts);
-		return;
-	}
-	
-	/* Deliver the file system name. */
-	retval = async_data_write_finalize(callid, fs_name, size);
-	if (retval != EOK) {
-		ipc_answer_0(rid, retval);
-		free(mp);
-		free(opts);
-		free(fs_name);
-		return;
-	}
-	fs_name[size] = '\0';
-
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
 	/*
 	 * Wait for IPC_M_PING so that we can return an error if we don't know
@@ -385,5 +303,5 @@
 	 */
 	ipc_call_t data;
-	callid = async_get_call(&data);
+	ipc_callid_t callid = async_get_call(&data);
 	if (IPC_GET_METHOD(data) != IPC_M_PING) {
 		ipc_answer_0(callid, ENOTSUP);
@@ -442,5 +360,6 @@
 	 * Receive the mount point path.
 	 */
-	rc = async_data_string_receive(&mp, MAX_PATH_LEN);
+	rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
+	    0, NULL);
 	if (rc != EOK)
 		ipc_answer_0(rid, rc);
@@ -606,25 +525,10 @@
 		lflag |= L_EXCLUSIVE;
 	
-	ipc_callid_t callid;
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	char *path = malloc(len + 1);
-	if (!path) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	
-	int rc;
-	if ((rc = async_data_write_finalize(callid, path, len))) {
-		ipc_answer_0(rid, rc);
-		free(path);
-		return;
-	}
-	path[len] = '\0';
+	char *path;
+	int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
 	
 	/*
@@ -894,20 +798,4 @@
 	
 	/*
-	 * Now we need to receive a call with client's
-	 * IPC_M_DATA_READ/IPC_M_DATA_WRITE request.
-	 */
-	ipc_callid_t callid;
-	int res;
-	if (read)
-		res = async_data_read_receive(&callid, NULL);
-	else 
-		res = async_data_write_receive(&callid, NULL);
-	if (!res) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	/*
 	 * Lock the open file structure so that no other thread can manipulate
 	 * the same open file at a time.
@@ -933,30 +821,32 @@
 	}
 	
-	int fs_phone = vfs_grab_phone(file->node->fs_handle);	
-	
-	/* Make a VFS_READ/VFS_WRITE request at the destination FS server. */
-	aid_t msg;
-	ipc_call_t answer;
-	if (!read && file->append)
-		file->pos = file->node->size;
-	msg = async_send_3(fs_phone, read ? VFS_OUT_READ : VFS_OUT_WRITE,
-	    file->node->dev_handle, file->node->index, file->pos, &answer);
-	
-	/*
-	 * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the
+	int fs_phone = vfs_grab_phone(file->node->fs_handle);
+	
+	/*
+	 * Make a VFS_READ/VFS_WRITE request at the destination FS server
+	 * and forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the
 	 * destination FS server. The call will be routed as if sent by
 	 * ourselves. Note that call arguments are immutable in this case so we
 	 * don't have to bother.
 	 */
-	ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
-
-	/* Wait for reply from the FS server. */
 	ipcarg_t rc;
-	async_wait_for(msg, &rc);
+	ipc_call_t answer;
+	if (read) {
+		if (file->append)
+			file->pos = file->node->size;
+		
+		rc = async_data_read_forward_3_1(fs_phone, VFS_OUT_READ,
+		    file->node->dev_handle, file->node->index, file->pos,
+		    &answer);
+	} else {
+		rc = async_data_write_forward_3_1(fs_phone, VFS_OUT_WRITE,
+		    file->node->dev_handle, file->node->index, file->pos,
+		    &answer);
+	}
 	
 	vfs_release_phone(fs_phone);
 	
 	size_t bytes = IPC_GET_ARG1(answer);
-
+	
 	if (file->node->type == VFS_NODE_DIRECTORY)
 		fibril_rwlock_read_unlock(&namespace_rwlock);
@@ -1120,26 +1010,12 @@
 void vfs_stat(ipc_callid_t rid, ipc_call_t *request)
 {
-	size_t len;
+	char *path;
+	int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
 	ipc_callid_t callid;
-
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *path = malloc(len + 1);
-	if (!path) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	int rc;
-	if ((rc = async_data_write_finalize(callid, path, len))) {
-		ipc_answer_0(rid, rc);
-		free(path);
-		return;
-	}
-	path[len] = '\0';
-
 	if (!async_data_read_receive(&callid, NULL)) {
 		free(path);
@@ -1187,27 +1063,12 @@
 {
 	int mode = IPC_GET_ARG1(*request);
-
-	size_t len;
-	ipc_callid_t callid;
-
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *path = malloc(len + 1);
-	if (!path) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	int rc;
-	if ((rc = async_data_write_finalize(callid, path, len))) {
-		ipc_answer_0(rid, rc);
-		free(path);
-		return;
-	}
-	path[len] = '\0';
-
+	
+	char *path;
+	int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
 	/* Ignore mode for now. */
 	(void) mode;
@@ -1224,26 +1085,11 @@
 {
 	int lflag = IPC_GET_ARG1(*request);
-
-	size_t len;
-	ipc_callid_t callid;
-
-	if (!async_data_write_receive(&callid, &len)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *path = malloc(len + 1);
-	if (!path) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	int rc;
-	if ((rc = async_data_write_finalize(callid, path, len))) {
-		ipc_answer_0(rid, rc);
-		free(path);
-		return;
-	}
-	path[len] = '\0';
+	
+	char *path;
+	int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
 	
 	fibril_rwlock_write_lock(&namespace_rwlock);
@@ -1274,52 +1120,27 @@
 void vfs_rename(ipc_callid_t rid, ipc_call_t *request)
 {
-	size_t olen, nlen;
-	ipc_callid_t callid;
-	int rc;
-
 	/* Retrieve the old path. */
-	if (!async_data_write_receive(&callid, &olen)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	char *old = malloc(olen + 1);
-	if (!old) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	if ((rc = async_data_write_finalize(callid, old, olen))) {
-		ipc_answer_0(rid, rc);
+	char *old;
+	int rc = async_data_write_accept((void **) &old, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
+	/* Retrieve the new path. */
+	char *new;
+	rc = async_data_write_accept((void **) &new, true, 0, 0, 0, NULL);
+	if (rc != EOK) {
 		free(old);
-		return;
-	}
-	old[olen] = '\0';
-	
-	/* Retrieve the new path. */
-	if (!async_data_write_receive(&callid, &nlen)) {
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		free(old);
-		return;
-	}
-	char *new = malloc(nlen + 1);
-	if (!new) {
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		free(old);
-		return;
-	}
-	if ((rc = async_data_write_finalize(callid, new, nlen))) {
-		ipc_answer_0(rid, rc);
-		free(old);
-		free(new);
-		return;
-	}
-	new[nlen] = '\0';
-
+		ipc_answer_0(rid, rc);
+		return;
+	}
+	
+	size_t olen;
+	size_t nlen;
 	char *oldc = canonify(old, &olen);
 	char *newc = canonify(new, &nlen);
-	if (!oldc || !newc) {
+	
+	if ((!oldc) || (!newc)) {
 		ipc_answer_0(rid, EINVAL);
 		free(old);
@@ -1327,6 +1148,8 @@
 		return;
 	}
+	
 	oldc[olen] = '\0';
 	newc[nlen] = '\0';
+	
 	if ((!str_lcmp(newc, oldc, str_length(oldc))) &&
 	    ((newc[str_length(oldc)] == '/') ||
@@ -1349,4 +1172,5 @@
 	vfs_lookup_res_t new_par_lr;
 	fibril_rwlock_write_lock(&namespace_rwlock);
+	
 	/* Lookup the node belonging to the old file name. */
 	rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL);
@@ -1358,4 +1182,5 @@
 		return;
 	}
+	
 	vfs_node_t *old_node = vfs_node_get(&old_lr);
 	if (!old_node) {
@@ -1366,4 +1191,5 @@
 		return;
 	}
+	
 	/* Determine the path to the parent of the node with the new name. */
 	char *parentc = str_dup(newc);
@@ -1375,4 +1201,5 @@
 		return;
 	}
+	
 	char *lastsl = str_rchr(parentc + 1, '/');
 	if (lastsl)
@@ -1380,4 +1207,5 @@
 	else
 		parentc[1] = '\0';
+	
 	/* Lookup parent of the new file name. */
 	rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL);
@@ -1390,4 +1218,5 @@
 		return;
 	}
+	
 	/* Check whether linking to the same file system instance. */
 	if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) ||
@@ -1399,7 +1228,9 @@
 		return;
 	}
+	
 	/* Destroy the old link for the new name. */
 	vfs_node_t *new_node = NULL;
 	rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL);
+	
 	switch (rc) {
 	case ENOENT:
@@ -1426,4 +1257,5 @@
 		return;
 	}
+	
 	/* Create the new link for the new name. */
 	rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index);
@@ -1437,7 +1269,9 @@
 		return;
 	}
+	
 	fibril_mutex_lock(&nodes_mutex);
 	old_node->lnkcnt++;
 	fibril_mutex_unlock(&nodes_mutex);
+	
 	/* Destroy the link for the old name. */
 	rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL);
@@ -1452,4 +1286,5 @@
 		return;
 	}
+	
 	fibril_mutex_lock(&nodes_mutex);
 	old_node->lnkcnt--;
@@ -1457,6 +1292,8 @@
 	fibril_rwlock_write_unlock(&namespace_rwlock);
 	vfs_node_put(old_node);
+	
 	if (new_node)
 		vfs_node_put(new_node);
+	
 	free(old);
 	free(new);
Index: uspace/srv/vfs/vfs_register.c
===================================================================
--- uspace/srv/vfs/vfs_register.c	(revision 3f93cdbe3a5df29d2432f1019f5de8b577780b68)
+++ uspace/srv/vfs/vfs_register.c	(revision 25e963a4ef2317193f84850c7106d029ba6f8086)
@@ -110,78 +110,43 @@
 void vfs_register(ipc_callid_t rid, ipc_call_t *request)
 {
-	ipc_callid_t callid;
-	ipc_call_t call;
-	int rc;
-	size_t size;
-
 	dprintf("Processing VFS_REGISTER request received from %p.\n",
 	    request->in_phone_hash);
-
-	/*
-	 * The first call has to be IPC_M_DATA_SEND in which we receive the
-	 * VFS info structure from the client FS.
-	 */
-	if (!async_data_write_receive(&callid, &size)) {
-		/*
-		 * The client doesn't obey the same protocol as we do.
-		 */
-		dprintf("Receiving of VFS info failed.\n");
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-	
-	dprintf("VFS info received, size = %d\n", size);
-	
-	/*
-	 * We know the size of the VFS info structure. See if the client
-	 * understands this easy concept too.
-	 */
-	if (size != sizeof(vfs_info_t)) {
-		/*
-		 * The client is sending us something, which cannot be
-		 * the info structure.
-		 */
-		dprintf("Received VFS info has bad size.\n");
-		ipc_answer_0(callid, EINVAL);
-		ipc_answer_0(rid, EINVAL);
-		return;
-	}
-
-	/*
-	 * Allocate and initialize a buffer for the fs_info structure.
-	 */
-	fs_info_t *fs_info;
-	fs_info = (fs_info_t *) malloc(sizeof(fs_info_t));
-	if (!fs_info) {
-		dprintf("Could not allocate memory for FS info.\n");
-		ipc_answer_0(callid, ENOMEM);
-		ipc_answer_0(rid, ENOMEM);
-		return;
-	}
-	link_initialize(&fs_info->fs_link);
-	fibril_mutex_initialize(&fs_info->phone_lock);
-		
-	rc = async_data_write_finalize(callid, &fs_info->vfs_info, size);
+	
+	vfs_info_t *vfs_info;
+	int rc = async_data_write_accept((void **) &vfs_info, false,
+	    sizeof(vfs_info_t), sizeof(vfs_info_t), 0, NULL);
+	
 	if (rc != EOK) {
 		dprintf("Failed to deliver the VFS info into our AS, rc=%d.\n",
 		    rc);
-		free(fs_info);
-		ipc_answer_0(callid, rc);
 		ipc_answer_0(rid, rc);
 		return;
 	}
-
+	
+	/*
+	 * Allocate and initialize a buffer for the fs_info structure.
+	 */
+	fs_info_t *fs_info = (fs_info_t *) malloc(sizeof(fs_info_t));
+	if (!fs_info) {
+		dprintf("Could not allocate memory for FS info.\n");
+		ipc_answer_0(rid, ENOMEM);
+		return;
+	}
+	
+	link_initialize(&fs_info->fs_link);
+	fibril_mutex_initialize(&fs_info->phone_lock);
+	fs_info->vfs_info = *vfs_info;
+	free(vfs_info);
+	
 	dprintf("VFS info delivered.\n");
-		
+	
 	if (!vfs_info_sane(&fs_info->vfs_info)) {
 		free(fs_info);
-		ipc_answer_0(callid, EINVAL);
 		ipc_answer_0(rid, EINVAL);
 		return;
 	}
-		
+	
 	fibril_mutex_lock(&fs_head_lock);
-
+	
 	/*
 	 * Check for duplicit registrations.
@@ -194,9 +159,8 @@
 		fibril_mutex_unlock(&fs_head_lock);
 		free(fs_info);
-		ipc_answer_0(callid, EEXISTS);
 		ipc_answer_0(rid, EEXISTS);
 		return;
 	}
-
+	
 	/*
 	 * Add fs_info to the list of registered FS's.
@@ -210,5 +174,6 @@
 	 * which to forward VFS requests to it.
 	 */
-	callid = async_get_call(&call);
+	ipc_call_t call;
+	ipc_callid_t callid = async_get_call(&call);
 	if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {
 		dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call));
@@ -222,11 +187,12 @@
 	fs_info->phone = IPC_GET_ARG5(call);
 	ipc_answer_0(callid, EOK);
-
+	
 	dprintf("Callback connection to FS created.\n");
-
+	
 	/*
 	 * The client will want us to send him the address space area with PLB.
 	 */
-
+	
+	size_t size;
 	if (!async_share_in_receive(&callid, &size)) {
 		dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call));
@@ -253,5 +219,5 @@
 		return;
 	}
-
+	
 	/*
 	 * Commit to read-only sharing the PLB with the client.
@@ -259,7 +225,7 @@
 	(void) async_share_in_finalize(callid, plb,
 	    AS_AREA_READ | AS_AREA_CACHEABLE);
-
+	
 	dprintf("Sharing PLB.\n");
-
+	
 	/*
 	 * That was it. The FS has been registered.