diff --git a/fs/aio.c b/fs/aio.c
index 9506301..27ff565 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -15,6 +15,7 @@
 #include <linux/aio_abi.h>
 #include <linux/module.h>
 #include <linux/syscalls.h>
+#include <linux/uio.h>
 
 #define DEBUG 0
 
@@ -1315,8 +1316,11 @@
 	ssize_t ret = 0;
 
 	do {
-		ret = file->f_op->aio_read(iocb, iocb->ki_buf,
-			iocb->ki_left, iocb->ki_pos);
+		iocb->ki_inline_vec.iov_base = iocb->ki_buf;
+		iocb->ki_inline_vec.iov_len = iocb->ki_left;
+
+		ret = file->f_op->aio_read(iocb, &iocb->ki_inline_vec,
+						1, iocb->ki_pos);
 		/*
 		 * Can't just depend on iocb->ki_left to determine
 		 * whether we are done. This may have been a short read.
@@ -1349,8 +1353,11 @@
 	ssize_t ret = 0;
 
 	do {
-		ret = file->f_op->aio_write(iocb, iocb->ki_buf,
-			iocb->ki_left, iocb->ki_pos);
+		iocb->ki_inline_vec.iov_base = iocb->ki_buf;
+		iocb->ki_inline_vec.iov_len = iocb->ki_left;
+
+		ret = file->f_op->aio_write(iocb, &iocb->ki_inline_vec,
+						1, iocb->ki_pos);
 		if (ret > 0) {
 			iocb->ki_buf += ret;
 			iocb->ki_left -= ret;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0c361ea..8c81911 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1162,14 +1162,6 @@
 	return generic_file_write_nolock(file, &local_iov, 1, ppos);
 }
 
-static ssize_t blkdev_file_aio_write(struct kiocb *iocb, const char __user *buf,
-				   size_t count, loff_t pos)
-{
-	struct iovec local_iov = { .iov_base = (void __user *)buf, .iov_len = count };
-
-	return generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
-}
-
 static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
 	return blkdev_ioctl(file->f_mapping->host, file, cmd, arg);
@@ -1192,7 +1184,7 @@
 	.read		= generic_file_read,
 	.write		= blkdev_file_write,
   	.aio_read	= generic_file_aio_read,
-  	.aio_write	= blkdev_file_aio_write, 
+  	.aio_write	= generic_file_aio_write_nolock,
 	.mmap		= generic_file_mmap,
 	.fsync		= block_fsync,
 	.unlocked_ioctl	= block_ioctl,
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 22bcf4d..5abb42a7 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -492,13 +492,13 @@
 	return written;
 }
 
-static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
-				   size_t count, loff_t pos)
+static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+				   unsigned long nr_segs, loff_t pos)
 {
 	struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 	ssize_t written;
 
-	written = generic_file_aio_write(iocb, buf, count, pos);
+	written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 	if (!CIFS_I(inode)->clientCanCacheAll)
 		filemap_fdatawrite(inode->i_mapping);
 	return written;
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index 74ff20f..5c76245 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -48,14 +48,15 @@
 }
 
 static ssize_t
-ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
+ext3_file_write(struct kiocb *iocb, const struct iovec *iov,
+		unsigned long nr_segs, loff_t pos)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file->f_dentry->d_inode;
 	ssize_t ret;
 	int err;
 
-	ret = generic_file_aio_write(iocb, buf, count, pos);
+	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
 
 	/*
 	 * Skip flushing if there was an error, or if nothing was written.
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 377839b..9f7f8b9 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -707,8 +707,8 @@
 /**
  * nfs_file_direct_read - file direct read operation for NFS files
  * @iocb: target I/O control block
- * @buf: user's buffer into which to read data
- * @count: number of bytes to read
+ * @iov: vector of user buffers into which to read data
+ * @nr_segs: size of iov vector
  * @pos: byte offset in file where reading starts
  *
  * We use this function for direct reads instead of calling
@@ -725,17 +725,24 @@
  * client must read the updated atime from the server back into its
  * cache.
  */
-ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count, loff_t pos)
+ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
+				unsigned long nr_segs, loff_t pos)
 {
 	ssize_t retval = -EINVAL;
 	struct file *file = iocb->ki_filp;
 	struct address_space *mapping = file->f_mapping;
+	/* XXX: temporary */
+	const char __user *buf = iov[0].iov_base;
+	size_t count = iov[0].iov_len;
 
 	dprintk("nfs: direct read(%s/%s, %lu@%Ld)\n",
 		file->f_dentry->d_parent->d_name.name,
 		file->f_dentry->d_name.name,
 		(unsigned long) count, (long long) pos);
 
+	if (nr_segs != 1)
+		return -EINVAL;
+
 	if (count < 0)
 		goto out;
 	retval = -EFAULT;
@@ -760,8 +767,8 @@
 /**
  * nfs_file_direct_write - file direct write operation for NFS files
  * @iocb: target I/O control block
- * @buf: user's buffer from which to write data
- * @count: number of bytes to write
+ * @iov: vector of user buffers from which to write data
+ * @nr_segs: size of iov vector
  * @pos: byte offset in file where writing starts
  *
  * We use this function for direct writes instead of calling
@@ -782,17 +789,24 @@
  * Note that O_APPEND is not supported for NFS direct writes, as there
  * is no atomic O_APPEND write facility in the NFS protocol.
  */
-ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
+ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
+				unsigned long nr_segs, loff_t pos)
 {
 	ssize_t retval;
 	struct file *file = iocb->ki_filp;
 	struct address_space *mapping = file->f_mapping;
+	/* XXX: temporary */
+	const char __user *buf = iov[0].iov_base;
+	size_t count = iov[0].iov_len;
 
 	dfprintk(VFS, "nfs: direct write(%s/%s, %lu@%Ld)\n",
 		file->f_dentry->d_parent->d_name.name,
 		file->f_dentry->d_name.name,
 		(unsigned long) count, (long long) pos);
 
+	if (nr_segs != 1)
+		return -EINVAL;
+
 	retval = generic_write_checks(file, &pos, &count, 0);
 	if (retval)
 		goto out;
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index be997d6..cc93865 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -41,8 +41,10 @@
 static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
 static int  nfs_file_mmap(struct file *, struct vm_area_struct *);
 static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
-static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
-static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t);
+static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
+				unsigned long nr_segs, loff_t pos);
+static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
+				unsigned long nr_segs, loff_t pos);
 static int  nfs_file_flush(struct file *, fl_owner_t id);
 static int  nfs_fsync(struct file *, struct dentry *dentry, int datasync);
 static int nfs_check_flags(int flags);
@@ -53,8 +55,8 @@
 	.llseek		= nfs_file_llseek,
 	.read		= do_sync_read,
 	.write		= do_sync_write,
-	.aio_read		= nfs_file_read,
-	.aio_write		= nfs_file_write,
+	.aio_read	= nfs_file_read,
+	.aio_write	= nfs_file_write,
 	.mmap		= nfs_file_mmap,
 	.open		= nfs_file_open,
 	.flush		= nfs_file_flush,
@@ -196,15 +198,17 @@
 }
 
 static ssize_t
-nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos)
+nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
+		unsigned long nr_segs, loff_t pos)
 {
 	struct dentry * dentry = iocb->ki_filp->f_dentry;
 	struct inode * inode = dentry->d_inode;
 	ssize_t result;
+	size_t count = iov_length(iov, nr_segs);
 
 #ifdef CONFIG_NFS_DIRECTIO
 	if (iocb->ki_filp->f_flags & O_DIRECT)
-		return nfs_file_direct_read(iocb, buf, count, pos);
+		return nfs_file_direct_read(iocb, iov, nr_segs, pos);
 #endif
 
 	dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n",
@@ -214,7 +218,7 @@
 	result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
 	nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count);
 	if (!result)
-		result = generic_file_aio_read(iocb, buf, count, pos);
+		result = generic_file_aio_read(iocb, iov, nr_segs, pos);
 	return result;
 }
 
@@ -336,24 +340,22 @@
 #endif
 };
 
-/* 
- * Write to a file (through the page cache).
- */
-static ssize_t
-nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
+static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
+				unsigned long nr_segs, loff_t pos)
 {
 	struct dentry * dentry = iocb->ki_filp->f_dentry;
 	struct inode * inode = dentry->d_inode;
 	ssize_t result;
+	size_t count = iov_length(iov, nr_segs);
 
 #ifdef CONFIG_NFS_DIRECTIO
 	if (iocb->ki_filp->f_flags & O_DIRECT)
-		return nfs_file_direct_write(iocb, buf, count, pos);
+		return nfs_file_direct_write(iocb, iov, nr_segs, pos);
 #endif
 
-	dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n",
+	dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name,
-		inode->i_ino, (unsigned long) count, (unsigned long) pos);
+		inode->i_ino, (unsigned long) count, (long long) pos);
 
 	result = -EBUSY;
 	if (IS_SWAPFILE(inode))
@@ -372,7 +374,7 @@
 		goto out;
 
 	nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
-	result = generic_file_aio_write(iocb, buf, count, pos);
+	result = generic_file_aio_write(iocb, iov, nr_segs, pos);
 out:
 	return result;
 
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 585a79d..0c46f5c 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2176,20 +2176,18 @@
 /**
  * ntfs_file_aio_write -
  */
-static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const char __user *buf,
-		size_t count, loff_t pos)
+static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+		unsigned long nr_segs, loff_t pos)
 {
 	struct file *file = iocb->ki_filp;
 	struct address_space *mapping = file->f_mapping;
 	struct inode *inode = mapping->host;
 	ssize_t ret;
-	struct iovec local_iov = { .iov_base = (void __user *)buf,
-				   .iov_len = count };
 
 	BUG_ON(iocb->ki_pos != pos);
 
 	mutex_lock(&inode->i_mutex);
-	ret = ntfs_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
+	ret = ntfs_file_aio_write_nolock(iocb, iov, nr_segs, &iocb->ki_pos);
 	mutex_unlock(&inode->i_mutex);
 	if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
 		int err = sync_page_range(inode, mapping, pos, ret);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 2bbfa17..d9ba0a9 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -961,25 +961,23 @@
 }
 
 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
-				    const char __user *buf,
-				    size_t count,
+				    const struct iovec *iov,
+				    unsigned long nr_segs,
 				    loff_t pos)
 {
-	struct iovec local_iov = { .iov_base = (void __user *)buf,
-				   .iov_len = count };
 	int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
 	u32 clusters;
 	struct file *filp = iocb->ki_filp;
 	struct inode *inode = filp->f_dentry->d_inode;
 	loff_t newsize, saved_pos;
 
-	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
-		   (unsigned int)count,
+	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
+		   (unsigned int)nr_segs,
 		   filp->f_dentry->d_name.len,
 		   filp->f_dentry->d_name.name);
 
 	/* happy write of zero bytes */
-	if (count == 0)
+	if (iocb->ki_left == 0)
 		return 0;
 
 	if (!inode) {
@@ -1048,7 +1046,7 @@
 		} else {
 			saved_pos = iocb->ki_pos;
 		}
-		newsize = count + saved_pos;
+		newsize = iocb->ki_left + saved_pos;
 
 		mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
 		     (long long) saved_pos, (long long) newsize,
@@ -1081,7 +1079,7 @@
 		if (!clusters)
 			break;
 
-		ret = ocfs2_extend_file(inode, NULL, newsize, count);
+		ret = ocfs2_extend_file(inode, NULL, newsize, iocb->ki_left);
 		if (ret < 0) {
 			if (ret != -ENOSPC)
 				mlog_errno(ret);
@@ -1098,7 +1096,7 @@
 	/* communicate with ocfs2_dio_end_io */
 	ocfs2_iocb_set_rw_locked(iocb);
 
-	ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
+	ret = generic_file_aio_write_nolock(iocb, iov, nr_segs, iocb->ki_pos);
 
 	/* buffered aio wouldn't have proper lock coverage today */
 	BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
@@ -1132,16 +1130,16 @@
 }
 
 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
-				   char __user *buf,
-				   size_t count,
+				   const struct iovec *iov,
+				   unsigned long nr_segs,
 				   loff_t pos)
 {
 	int ret = 0, rw_level = -1, have_alloc_sem = 0;
 	struct file *filp = iocb->ki_filp;
 	struct inode *inode = filp->f_dentry->d_inode;
 
-	mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
-		   (unsigned int)count,
+	mlog_entry("(0x%p, %u, '%.*s')\n", filp,
+		   (unsigned int)nr_segs,
 		   filp->f_dentry->d_name.len,
 		   filp->f_dentry->d_name.name);
 
@@ -1185,7 +1183,7 @@
 	}
 	ocfs2_meta_unlock(inode, 0);
 
-	ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
+	ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
 	if (ret == -EINVAL)
 		mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
 
diff --git a/fs/read_write.c b/fs/read_write.c
index d4cb318..679dd535 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -227,14 +227,20 @@
 
 ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 {
+	struct iovec iov = { .iov_base = buf, .iov_len = len };
 	struct kiocb kiocb;
 	ssize_t ret;
 
 	init_sync_kiocb(&kiocb, filp);
 	kiocb.ki_pos = *ppos;
-	while (-EIOCBRETRY ==
-		(ret = filp->f_op->aio_read(&kiocb, buf, len, kiocb.ki_pos)))
+	kiocb.ki_left = len;
+
+	for (;;) {
+		ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
+		if (ret != -EIOCBRETRY)
+			break;
 		wait_on_retry_sync_kiocb(&kiocb);
+	}
 
 	if (-EIOCBQUEUED == ret)
 		ret = wait_on_sync_kiocb(&kiocb);
@@ -279,14 +285,20 @@
 
 ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 {
+	struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
 	struct kiocb kiocb;
 	ssize_t ret;
 
 	init_sync_kiocb(&kiocb, filp);
 	kiocb.ki_pos = *ppos;
-	while (-EIOCBRETRY ==
-	       (ret = filp->f_op->aio_write(&kiocb, buf, len, kiocb.ki_pos)))
+	kiocb.ki_left = len;
+
+	for (;;) {
+		ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
+		if (ret != -EIOCBRETRY)
+			break;
 		wait_on_retry_sync_kiocb(&kiocb);
+	}
 
 	if (-EIOCBQUEUED == ret)
 		ret = wait_on_sync_kiocb(&kiocb);
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index c11f611..41f2436 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -1334,7 +1334,7 @@
 			if (err)
 				return err;
 		}
-		result = generic_file_write(file, buf, count, ppos);
+		result = do_sync_write(file, buf, count, ppos);
 
 		if (after_file_end) {	/* Now update i_size and remove the savelink */
 			struct reiserfs_transaction_handle th;
@@ -1566,7 +1566,7 @@
 }
 
 const struct file_operations reiserfs_file_operations = {
-	.read = generic_file_read,
+	.read = do_sync_read,
 	.write = reiserfs_file_write,
 	.ioctl = reiserfs_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 41cfcba..4737971 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -49,50 +49,49 @@
 STATIC inline ssize_t
 __xfs_file_read(
 	struct kiocb		*iocb,
-	char			__user *buf,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
 	int			ioflags,
-	size_t			count,
 	loff_t			pos)
 {
-	struct iovec		iov = {buf, count};
 	struct file		*file = iocb->ki_filp;
 	bhv_vnode_t		*vp = vn_from_inode(file->f_dentry->d_inode);
 
 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))
 		ioflags |= IO_ISDIRECT;
-	return bhv_vop_read(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL);
+	return bhv_vop_read(vp, iocb, iov, nr_segs, &iocb->ki_pos,
+				ioflags, NULL);
 }
 
 STATIC ssize_t
 xfs_file_aio_read(
 	struct kiocb		*iocb,
-	char			__user *buf,
-	size_t			count,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
 	loff_t			pos)
 {
-	return __xfs_file_read(iocb, buf, IO_ISAIO, count, pos);
+	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos);
 }
 
 STATIC ssize_t
 xfs_file_aio_read_invis(
 	struct kiocb		*iocb,
-	char			__user *buf,
-	size_t			count,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
 	loff_t			pos)
 {
-	return __xfs_file_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
+	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
 }
 
 STATIC inline ssize_t
 __xfs_file_write(
-	struct kiocb	*iocb,
-	const char	__user *buf,
-	int		ioflags,
-	size_t		count,
-	loff_t		pos)
+	struct kiocb		*iocb,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
+	int			ioflags,
+	loff_t			pos)
 {
-	struct iovec	iov = {(void __user *)buf, count};
 	struct file	*file = iocb->ki_filp;
 	struct inode	*inode = file->f_mapping->host;
 	bhv_vnode_t	*vp = vn_from_inode(inode);
@@ -100,27 +99,28 @@
 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))
 		ioflags |= IO_ISDIRECT;
-	return bhv_vop_write(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL);
+	return bhv_vop_write(vp, iocb, iov, nr_segs, &iocb->ki_pos,
+				ioflags, NULL);
 }
 
 STATIC ssize_t
 xfs_file_aio_write(
 	struct kiocb		*iocb,
-	const char		__user *buf,
-	size_t			count,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
 	loff_t			pos)
 {
-	return __xfs_file_write(iocb, buf, IO_ISAIO, count, pos);
+	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
 }
 
 STATIC ssize_t
 xfs_file_aio_write_invis(
 	struct kiocb		*iocb,
-	const char		__user *buf,
-	size_t			count,
+	const struct iovec	*iov,
+	unsigned long		nr_segs,
 	loff_t			pos)
 {
-	return __xfs_file_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
+	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
 }
 
 STATIC inline ssize_t