diff -rupN fuse-2.7.2/kernel/dir.c fuse-2.7.2-glfs7/kernel/dir.c
--- fuse-2.7.2/kernel/dir.c	2007-12-12 21:00:11.000000000 +0200
+++ fuse-2.7.2-glfs7/kernel/dir.c	2007-12-26 01:08:13.000000000 +0200
@@ -380,6 +380,10 @@ static int fuse_create_open(struct inode
 	d_instantiate(entry, inode);
 	fuse_invalidate_attr(dir);
 	fuse_change_timeout(entry, &outentry);
+	if (flags & O_DIRECT) {
+		outopen.open_flags |= FOPEN_DIRECT_IO;
+		nd->intent.open.flags &= ~O_DIRECT;
+	}
 	file = lookup_instantiate_filp(nd, entry, generic_file_open);
 	if (IS_ERR(file)) {
 		ff->fh = outopen.fh;
@@ -1135,11 +1139,12 @@ static int fuse_getattr(struct vfsmount 
 {
 	struct inode *inode = entry->d_inode;
 	int err = fuse_revalidate(entry);
-	if (!err)
+	if (!err) {
 		/* FIXME: may want specialized function because of
 		   st_blksize on block devices on 2.6.19+ */
 		generic_fillattr(inode, stat);
-
+		stat->blksize = 1048576;
+	}
 	return err;
 }
 
diff -rupN fuse-2.7.2/kernel/file.c fuse-2.7.2-glfs7/kernel/file.c
--- fuse-2.7.2/kernel/file.c	2007-10-16 19:35:22.000000000 +0300
+++ fuse-2.7.2-glfs7/kernel/file.c	2007-12-26 01:14:04.000000000 +0200
@@ -91,10 +91,6 @@ int fuse_open_common(struct inode *inode
 	struct fuse_file *ff;
 	int err;
 
-	/* VFS checks this, but only _after_ ->open() */
-	if (file->f_flags & O_DIRECT)
-		return -EINVAL;
-
 	err = generic_file_open(inode, file);
 	if (err)
 		return err;
@@ -115,6 +111,19 @@ int fuse_open_common(struct inode *inode
 	if (err)
 		fuse_file_free(ff);
 	else {
+		if (file->f_flags & O_DIRECT) {
+			/* set fuse_direct_io_file_operations as fops
+			   in fuse_finish_open as though the FS
+			   enforced direct_io
+			*/
+                        outarg.open_flags |= FOPEN_DIRECT_IO;
+			/* make VFS think this is a regular open
+			   to make it not check for aops->direct_IO.
+			   the same effect is acheived by setting fops
+			   to fuse_direct_io_file_operations
+			*/
+			file->f_flags &= ~O_DIRECT;
+                }
 		if (isdir)
 			outarg.open_flags &= ~FOPEN_DIRECT_IO;
 		fuse_finish_open(inode, file, ff, &outarg);
@@ -578,6 +587,8 @@ static ssize_t fuse_direct_io(struct fil
 		}
 		nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
 		nbytes = min(count, nbytes);
+		nbytes = min(nmax, nbytes);
+
 		if (write)
 			nres = fuse_send_write(req, file, inode, pos, nbytes);
 		else
@@ -865,6 +876,7 @@ static struct file_operations fuse_file_
 	.release	= fuse_release,
 	.fsync		= fuse_fsync,
 	.lock		= fuse_file_lock,
+	.flock          = fuse_file_lock,
 #ifdef KERNEL_2_6_23_PLUS
 	.splice_read	= generic_file_splice_read,
 #else
@@ -881,6 +893,7 @@ static struct file_operations fuse_direc
 	.release	= fuse_release,
 	.fsync		= fuse_fsync,
 	.lock		= fuse_file_lock,
+	.flock          = fuse_file_lock,
 	/* no mmap and sendfile */
 };
 
diff -rupN fuse-2.7.2/kernel/fuse_i.h fuse-2.7.2-glfs7/kernel/fuse_i.h
--- fuse-2.7.2/kernel/fuse_i.h	2007-12-12 21:00:11.000000000 +0200
+++ fuse-2.7.2-glfs7/kernel/fuse_i.h	2007-12-26 01:00:07.000000000 +0200
@@ -102,7 +102,7 @@
 #endif
 
 /** Max number of pages that can be used in a single read request */
-#define FUSE_MAX_PAGES_PER_REQ 32
+#define FUSE_MAX_PAGES_PER_REQ 257
 
 /** Maximum number of outstanding background requests */
 #define FUSE_MAX_BACKGROUND 10
diff -rupN fuse-2.7.2/kernel/inode.c fuse-2.7.2-glfs7/kernel/inode.c
--- fuse-2.7.2/kernel/inode.c	2007-12-12 21:01:04.000000000 +0200
+++ fuse-2.7.2-glfs7/kernel/inode.c	2007-12-26 01:17:03.000000000 +0200
@@ -140,7 +140,7 @@ void fuse_change_attributes(struct inode
 	i_size_write(inode, attr->size);
 	spin_unlock(&fc->lock);
 #ifdef HAVE_I_BLKSIZE
-	inode->i_blksize = PAGE_CACHE_SIZE;
+	inode->i_blksize = 1048576;
 #endif
 	inode->i_blocks  = attr->blocks;
 	inode->i_atime.tv_sec   = attr->atime;
@@ -350,7 +350,7 @@ static int parse_fuse_opt(char *opt, str
 	char *p;
 	memset(d, 0, sizeof(struct fuse_mount_data));
 	d->max_read = ~0;
-	d->blksize = 512;
+	d->blksize = 1048576;
 
 	/*
 	 * For unprivileged mounts use current uid/gid.  Still allow
@@ -481,7 +481,7 @@ static struct fuse_conn *new_conn(void)
 		INIT_LIST_HEAD(&fc->io);
 		INIT_LIST_HEAD(&fc->interrupts);
 		atomic_set(&fc->num_waiting, 0);
-		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
+		fc->bdi.ra_pages = 256;
 		fc->bdi.unplug_io_fn = default_unplug_io_fn;
 		fc->reqctr = 0;
 		fc->blocked = 1;
@@ -776,8 +776,8 @@ static int fuse_fill_super(struct super_
 			return -EINVAL;
 #endif
 	} else {
-		sb->s_blocksize = PAGE_CACHE_SIZE;
-		sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+		sb->s_blocksize = 1048576;
+		sb->s_blocksize_bits = 20;
 	}
 	sb->s_magic = FUSE_SUPER_MAGIC;
 	sb->s_op = &fuse_super_operations;
diff -rupN fuse-2.7.2/lib/fuse_kern_chan.c fuse-2.7.2-glfs7/lib/fuse_kern_chan.c
--- fuse-2.7.2/lib/fuse_kern_chan.c	2007-12-12 16:33:35.000000000 +0200
+++ fuse-2.7.2-glfs7/lib/fuse_kern_chan.c	2007-12-26 01:18:16.000000000 +0200
@@ -80,7 +80,7 @@ static void fuse_kern_chan_destroy(struc
 	close(fuse_chan_fd(ch));
 }
 
-#define MIN_BUFSIZE 0x21000
+#define MIN_BUFSIZE (1048576 + 0x1000)
 
 struct fuse_chan *fuse_kern_chan_new(int fd)
 {