Mountable btrfs, with readdir

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/Makefile

@@ -2,7 +2,8 @@ ifneq ($(KERNELRELEASE),)
 # kbuild part of makefile
 
 obj-m  := btrfs.o
-btrfs-y := super.o
+btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
+	   hash.o file-item.o inode-item.o inode-map.o disk-io.o
 
 #btrfs-y := ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
 #	  root-tree.o dir-item.o hash.o file-item.o inode-item.o \
@@ -14,7 +15,7 @@ else
 
 KERNELDIR := /lib/modules/`uname -r`/build
 all::
-	$(MAKE) -C $(KERNELDIR) M=`pwd` modules
+	$(MAKE) C=1 -C $(KERNELDIR) M=`pwd` modules
 clean::
 	rm *.o btrfs.ko
 endif

fs/btrfs/ctree.c

@@ -7,11 +7,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, struct btrfs_path *path, int data_size);
 static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
-			  *root, struct btrfs_buffer *dst, struct btrfs_buffer
+			  *root, struct buffer_head *dst, struct buffer_head
 			  *src);
 static int balance_node_right(struct btrfs_trans_handle *trans, struct
-			      btrfs_root *root, struct btrfs_buffer *dst_buf,
-			      struct btrfs_buffer *src_buf);
+			      btrfs_root *root, struct buffer_head *dst_buf,
+			      struct buffer_head *src_buf);
 static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		   struct btrfs_path *path, int level, int slot);
 
@@ -32,32 +32,34 @@ void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
 }
 
 static int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
-			   *root, struct btrfs_buffer *buf, struct btrfs_buffer
-			   *parent, int parent_slot, struct btrfs_buffer
+			   *root, struct buffer_head *buf, struct buffer_head
+			   *parent, int parent_slot, struct buffer_head
 			   **cow_ret)
 {
-	struct btrfs_buffer *cow;
+	struct buffer_head *cow;
+	struct btrfs_node *cow_node;
 
-	if (!list_empty(&buf->dirty)) {
+	if (!buffer_dirty(buf)) {
 		*cow_ret = buf;
 		return 0;
 	}
 	cow = btrfs_alloc_free_block(trans, root);
-	memcpy(&cow->node, &buf->node, root->blocksize);
-	btrfs_set_header_blocknr(&cow->node.header, cow->blocknr);
+	cow_node = btrfs_buffer_node(cow);
+	memcpy(cow_node, btrfs_buffer_node(buf), root->blocksize);
+	btrfs_set_header_blocknr(&cow_node->header, cow->b_blocknr);
 	*cow_ret = cow;
 	btrfs_inc_ref(trans, root, buf);
 	if (buf == root->node) {
 		root->node = cow;
-		cow->count++;
+		get_bh(cow);
 		if (buf != root->commit_root)
-			btrfs_free_extent(trans, root, buf->blocknr, 1, 1);
+			btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
 		btrfs_block_release(root, buf);
 	} else {
-		btrfs_set_node_blockptr(&parent->node, parent_slot,
-					cow->blocknr);
-		BUG_ON(list_empty(&parent->dirty));
-		btrfs_free_extent(trans, root, buf->blocknr, 1, 1);
+		btrfs_set_node_blockptr(btrfs_buffer_node(parent), parent_slot,
+					cow->b_blocknr);
+		BUG_ON(!buffer_dirty(parent));
+		btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
 	}
 	btrfs_block_release(root, buf);
 	return 0;
@@ -119,12 +121,12 @@ static int check_node(struct btrfs_root *root, struct btrfs_path *path,
 {
 	int i;
 	struct btrfs_node *parent = NULL;
-	struct btrfs_node *node = &path->nodes[level]->node;
+	struct btrfs_node *node = btrfs_buffer_node(path->nodes[level]);
 	int parent_slot;
 	u32 nritems = btrfs_header_nritems(&node->header);
 
 	if (path->nodes[level + 1])
-		parent = &path->nodes[level + 1]->node;
+		parent = btrfs_buffer_node(path->nodes[level + 1]);
 	parent_slot = path->slots[level + 1];
 	BUG_ON(nritems == 0);
 	if (parent) {
@@ -148,13 +150,13 @@ static int check_leaf(struct btrfs_root *root, struct btrfs_path *path,
 		      int level)
 {
 	int i;
-	struct btrfs_leaf *leaf = &path->nodes[level]->leaf;
+	struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[level]);
 	struct btrfs_node *parent = NULL;
 	int parent_slot;
 	u32 nritems = btrfs_header_nritems(&leaf->header);
 
 	if (path->nodes[level + 1])
-		parent = &path->nodes[level + 1]->node;
+		parent = btrfs_buffer_node(path->nodes[level + 1]);
 	parent_slot = path->slots[level + 1];
 	BUG_ON(btrfs_leaf_free_space(root, leaf) < 0);
 
@@ -250,11 +252,11 @@ static int bin_search(struct btrfs_node *c, struct btrfs_key *key, int *slot)
 	return -1;
 }
 
-static struct btrfs_buffer *read_node_slot(struct btrfs_root *root,
-				   struct btrfs_buffer *parent_buf,
+static struct buffer_head *read_node_slot(struct btrfs_root *root,
+				   struct buffer_head *parent_buf,
 				   int slot)
 {
-	struct btrfs_node *node = &parent_buf->node;
+	struct btrfs_node *node = btrfs_buffer_node(parent_buf);
 	if (slot < 0)
 		return NULL;
 	if (slot >= btrfs_header_nritems(&node->header))
@@ -265,10 +267,10 @@ static struct btrfs_buffer *read_node_slot(struct btrfs_root *root,
 static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 			 *root, struct btrfs_path *path, int level)
 {
-	struct btrfs_buffer *right_buf;
-	struct btrfs_buffer *mid_buf;
-	struct btrfs_buffer *left_buf;
-	struct btrfs_buffer *parent_buf = NULL;
+	struct buffer_head *right_buf;
+	struct buffer_head *mid_buf;
+	struct buffer_head *left_buf;
+	struct buffer_head *parent_buf = NULL;
 	struct btrfs_node *right = NULL;
 	struct btrfs_node *mid;
 	struct btrfs_node *left = NULL;
@@ -283,7 +285,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 		return 0;
 
 	mid_buf = path->nodes[level];
-	mid = &mid_buf->node;
+	mid = btrfs_buffer_node(mid_buf);
 	orig_ptr = btrfs_node_blockptr(mid, orig_slot);
 
 	if (level < BTRFS_MAX_LEVEL - 1)
@@ -295,8 +297,8 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 	 * by promoting the node below to a root
 	 */
 	if (!parent_buf) {
-		struct btrfs_buffer *child;
-		u64 blocknr = mid_buf->blocknr;
+		struct buffer_head *child;
+		u64 blocknr = mid_buf->b_blocknr;
 
 		if (btrfs_header_nritems(&mid->header) != 1)
 			return 0;
@@ -313,7 +315,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 		clean_tree_block(trans, root, mid_buf);
 		return btrfs_free_extent(trans, root, blocknr, 1, 1);
 	}
-	parent = &parent_buf->node;
+	parent = btrfs_buffer_node(parent_buf);
 
 	if (btrfs_header_nritems(&mid->header) >
 	    BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
@@ -326,7 +328,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (left_buf) {
 		btrfs_cow_block(trans, root, left_buf, parent_buf, pslot - 1,
 				&left_buf);
-		left = &left_buf->node;
+		left = btrfs_buffer_node(left_buf);
 		orig_slot += btrfs_header_nritems(&left->header);
 		wret = push_node_left(trans, root, left_buf, mid_buf);
 		if (wret < 0)
@@ -339,12 +341,12 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (right_buf) {
 		btrfs_cow_block(trans, root, right_buf, parent_buf, pslot + 1,
 				&right_buf);
-		right = &right_buf->node;
+		right = btrfs_buffer_node(right_buf);
 		wret = push_node_left(trans, root, mid_buf, right_buf);
 		if (wret < 0)
 			ret = wret;
 		if (btrfs_header_nritems(&right->header) == 0) {
-			u64 blocknr = right_buf->blocknr;
+			u64 blocknr = right_buf->b_blocknr;
 			btrfs_block_release(root, right_buf);
 			clean_tree_block(trans, root, right_buf);
 			right_buf = NULL;
@@ -360,7 +362,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 			memcpy(&parent->ptrs[pslot + 1].key,
 				&right->ptrs[0].key,
 				sizeof(struct btrfs_disk_key));
-			BUG_ON(list_empty(&parent_buf->dirty));
+			BUG_ON(!buffer_dirty(parent_buf));
 		}
 	}
 	if (btrfs_header_nritems(&mid->header) == 1) {
@@ -381,7 +383,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 	if (btrfs_header_nritems(&mid->header) == 0) {
 		/* we've managed to empty the middle node, drop it */
-		u64 blocknr = mid_buf->blocknr;
+		u64 blocknr = mid_buf->b_blocknr;
 		btrfs_block_release(root, mid_buf);
 		clean_tree_block(trans, root, mid_buf);
 		mid_buf = NULL;
@@ -396,13 +398,13 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 		/* update the parent key to reflect our changes */
 		memcpy(&parent->ptrs[pslot].key, &mid->ptrs[0].key,
 		       sizeof(struct btrfs_disk_key));
-		BUG_ON(list_empty(&parent_buf->dirty));
+		BUG_ON(!buffer_dirty(parent_buf));
 	}
 
 	/* update the path */
 	if (left_buf) {
 		if (btrfs_header_nritems(&left->header) > orig_slot) {
-			left_buf->count++; // released below
+			get_bh(left_buf);
 			path->nodes[level] = left_buf;
 			path->slots[level + 1] -= 1;
 			path->slots[level] = orig_slot;
@@ -415,7 +417,8 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 	/* double check we haven't messed things up */
 	check_block(root, path, level);
-	if (orig_ptr != btrfs_node_blockptr(&path->nodes[level]->node,
+	if (orig_ptr !=
+	    btrfs_node_blockptr(btrfs_buffer_node(path->nodes[level]),
 				path->slots[level]))
 		BUG();
 
@@ -443,8 +446,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, struct btrfs_key *key, struct btrfs_path *p, int
 		      ins_len, int cow)
 {
-	struct btrfs_buffer *b;
-	struct btrfs_buffer *cow_buf;
+	struct buffer_head *b;
+	struct buffer_head *cow_buf;
 	struct btrfs_node *c;
 	int slot;
 	int ret;
@@ -452,18 +455,20 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 
 again:
 	b = root->node;
-	b->count++;
+	get_bh(b);
 	while (b) {
-		level = btrfs_header_level(&b->node.header);
+		c = btrfs_buffer_node(b);
+		level = btrfs_header_level(&c->header);
 		if (cow) {
 			int wret;
-			wret = btrfs_cow_block(trans, root, b, p->nodes[level +
-					       1], p->slots[level + 1],
+			wret = btrfs_cow_block(trans, root, b,
+					       p->nodes[level + 1],
+					       p->slots[level + 1],
 					       &cow_buf);
 			b = cow_buf;
 		}
 		BUG_ON(!cow && ins_len);
-		c = &b->node;
+		c = btrfs_buffer_node(b);
 		p->nodes[level] = b;
 		ret = check_block(root, p, level);
 		if (ret)
@@ -480,7 +485,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 				if (sret)
 					return sret;
 				b = p->nodes[level];
-				c = &b->node;
+				c = btrfs_buffer_node(b);
 				slot = p->slots[level];
 			} else if (ins_len < 0) {
 				int sret = balance_level(trans, root, p,
@@ -490,7 +495,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 				b = p->nodes[level];
 				if (!b)
 					goto again;
-				c = &b->node;
+				c = btrfs_buffer_node(b);
 				slot = p->slots[level];
 				BUG_ON(btrfs_header_nritems(&c->header) == 1);
 			}
@@ -505,11 +510,9 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 				if (sret)
 					return sret;
 			}
-			BUG_ON(root->node->count == 1);
 			return ret;
 		}
 	}
-	BUG_ON(root->node->count == 1);
 	return 1;
 }
 
@@ -534,9 +537,9 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root
 		int tslot = path->slots[i];
 		if (!path->nodes[i])
 			break;
-		t = &path->nodes[i]->node;
+		t = btrfs_buffer_node(path->nodes[i]);
 		memcpy(&t->ptrs[tslot].key, key, sizeof(*key));
-		BUG_ON(list_empty(&path->nodes[i]->dirty));
+		BUG_ON(!buffer_dirty(path->nodes[i]));
 		if (tslot != 0)
 			break;
 	}
@@ -551,11 +554,11 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root
  * error, and > 0 if there was no room in the left hand block.
  */
 static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
-			  *root, struct btrfs_buffer *dst_buf, struct
-			  btrfs_buffer *src_buf)
+			  *root, struct buffer_head *dst_buf, struct
+			  buffer_head *src_buf)
 {
-	struct btrfs_node *src = &src_buf->node;
-	struct btrfs_node *dst = &dst_buf->node;
+	struct btrfs_node *src = btrfs_buffer_node(src_buf);
+	struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
 	int push_items = 0;
 	int src_nritems;
 	int dst_nritems;
@@ -580,8 +583,8 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 	btrfs_set_header_nritems(&src->header, src_nritems - push_items);
 	btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
-	BUG_ON(list_empty(&src_buf->dirty));
-	BUG_ON(list_empty(&dst_buf->dirty));
+	BUG_ON(!buffer_dirty(src_buf));
+	BUG_ON(!buffer_dirty(dst_buf));
 	return ret;
 }
 
@@ -595,11 +598,11 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
  * this will  only push up to 1/2 the contents of the left node over
  */
 static int balance_node_right(struct btrfs_trans_handle *trans, struct
-			      btrfs_root *root, struct btrfs_buffer *dst_buf,
-			      struct btrfs_buffer *src_buf)
+			      btrfs_root *root, struct buffer_head *dst_buf,
+			      struct buffer_head *src_buf)
 {
-	struct btrfs_node *src = &src_buf->node;
-	struct btrfs_node *dst = &dst_buf->node;
+	struct btrfs_node *src = btrfs_buffer_node(src_buf);
+	struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
 	int push_items = 0;
 	int max_push;
 	int src_nritems;
@@ -628,8 +631,8 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct
 	btrfs_set_header_nritems(&src->header, src_nritems - push_items);
 	btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
 
-	BUG_ON(list_empty(&src_buf->dirty));
-	BUG_ON(list_empty(&dst_buf->dirty));
+	BUG_ON(!buffer_dirty(src_buf));
+	BUG_ON(!buffer_dirty(dst_buf));
 	return ret;
 }
 
@@ -643,7 +646,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct
 static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
 			   *root, struct btrfs_path *path, int level)
 {
-	struct btrfs_buffer *t;
+	struct buffer_head *t;
 	struct btrfs_node *lower;
 	struct btrfs_node *c;
 	struct btrfs_disk_key *lower_key;
@@ -652,24 +655,24 @@ static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	BUG_ON(path->nodes[level-1] != root->node);
 
 	t = btrfs_alloc_free_block(trans, root);
-	c = &t->node;
+	c = btrfs_buffer_node(t);
 	memset(c, 0, root->blocksize);
 	btrfs_set_header_nritems(&c->header, 1);
 	btrfs_set_header_level(&c->header, level);
-	btrfs_set_header_blocknr(&c->header, t->blocknr);
+	btrfs_set_header_blocknr(&c->header, t->b_blocknr);
 	btrfs_set_header_parentid(&c->header,
-	                       btrfs_header_parentid(&root->node->node.header));
-	lower = &path->nodes[level-1]->node;
+	      btrfs_header_parentid(btrfs_buffer_header(root->node)));
+	lower = btrfs_buffer_node(path->nodes[level-1]);
 	if (btrfs_is_leaf(lower))
 		lower_key = &((struct btrfs_leaf *)lower)->items[0].key;
 	else
 		lower_key = &lower->ptrs[0].key;
 	memcpy(&c->ptrs[0].key, lower_key, sizeof(struct btrfs_disk_key));
-	btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->blocknr);
+	btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->b_blocknr);
 	/* the super has an extra ref to root->node */
 	btrfs_block_release(root, root->node);
 	root->node = t;
-	t->count++;
+	get_bh(t);
 	path->nodes[level] = t;
 	path->slots[level] = 0;
 	return 0;
@@ -692,7 +695,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
 	int nritems;
 
 	BUG_ON(!path->nodes[level]);
-	lower = &path->nodes[level]->node;
+	lower = btrfs_buffer_node(path->nodes[level]);
 	nritems = btrfs_header_nritems(&lower->header);
 	if (slot > nritems)
 		BUG();
@@ -705,7 +708,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
 	memcpy(&lower->ptrs[slot].key, key, sizeof(struct btrfs_disk_key));
 	btrfs_set_node_blockptr(lower, slot, blocknr);
 	btrfs_set_header_nritems(&lower->header, nritems + 1);
-	BUG_ON(list_empty(&path->nodes[level]->dirty));
+	BUG_ON(!buffer_dirty(path->nodes[level]));
 	return 0;
 }
 
@@ -721,9 +724,9 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
 static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, struct btrfs_path *path, int level)
 {
-	struct btrfs_buffer *t;
+	struct buffer_head *t;
 	struct btrfs_node *c;
-	struct btrfs_buffer *split_buffer;
+	struct buffer_head *split_buffer;
 	struct btrfs_node *split;
 	int mid;
 	int ret;
@@ -731,7 +734,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 	u32 c_nritems;
 
 	t = path->nodes[level];
-	c = &t->node;
+	c = btrfs_buffer_node(t);
 	if (t == root->node) {
 		/* trying to split the root, lets make a new one */
 		ret = insert_new_root(trans, root, path, level + 1);
@@ -740,11 +743,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 	c_nritems = btrfs_header_nritems(&c->header);
 	split_buffer = btrfs_alloc_free_block(trans, root);
-	split = &split_buffer->node;
+	split = btrfs_buffer_node(split_buffer);
 	btrfs_set_header_flags(&split->header, btrfs_header_flags(&c->header));
-	btrfs_set_header_blocknr(&split->header, split_buffer->blocknr);
+	btrfs_set_header_blocknr(&split->header, split_buffer->b_blocknr);
 	btrfs_set_header_parentid(&split->header,
-	                       btrfs_header_parentid(&root->node->node.header));
+	      btrfs_header_parentid(btrfs_buffer_header(root->node)));
 	mid = (c_nritems + 1) / 2;
 	memcpy(split->ptrs, c->ptrs + mid,
 		(c_nritems - mid) * sizeof(struct btrfs_key_ptr));
@@ -752,9 +755,9 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_set_header_nritems(&c->header, mid);
 	ret = 0;
 
-	BUG_ON(list_empty(&t->dirty));
+	BUG_ON(!buffer_dirty(t));
 	wret = insert_ptr(trans, root, path, &split->ptrs[0].key,
-			  split_buffer->blocknr, path->slots[level + 1] + 1,
+			  split_buffer->b_blocknr, path->slots[level + 1] + 1,
 			  level + 1);
 	if (wret)
 		ret = wret;
@@ -798,11 +801,12 @@ static int leaf_space_used(struct btrfs_leaf *l, int start, int nr)
 static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 			   *root, struct btrfs_path *path, int data_size)
 {
-	struct btrfs_buffer *left_buf = path->nodes[0];
-	struct btrfs_leaf *left = &left_buf->leaf;
+	struct buffer_head *left_buf = path->nodes[0];
+	struct btrfs_leaf *left = btrfs_buffer_leaf(left_buf);
 	struct btrfs_leaf *right;
-	struct btrfs_buffer *right_buf;
-	struct btrfs_buffer *upper;
+	struct buffer_head *right_buf;
+	struct buffer_head *upper;
+	struct btrfs_node *upper_node;
 	int slot;
 	int i;
 	int free_space;
@@ -817,12 +821,13 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 		return 1;
 	}
 	upper = path->nodes[1];
-	if (slot >= btrfs_header_nritems(&upper->node.header) - 1) {
+	upper_node = btrfs_buffer_node(upper);
+	if (slot >= btrfs_header_nritems(&upper_node->header) - 1) {
 		return 1;
 	}
-	right_buf = read_tree_block(root, btrfs_node_blockptr(&upper->node,
-							      slot + 1));
-	right = &right_buf->leaf;
+	right_buf = read_tree_block(root,
+		    btrfs_node_blockptr(btrfs_buffer_node(upper), slot + 1));
+	right = btrfs_buffer_leaf(right_buf);
 	free_space = btrfs_leaf_free_space(root, right);
 	if (free_space < data_size + sizeof(struct btrfs_item)) {
 		btrfs_block_release(root, right_buf);
@@ -830,7 +835,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 	/* cow and double check */
 	btrfs_cow_block(trans, root, right_buf, upper, slot + 1, &right_buf);
-	right = &right_buf->leaf;
+	right = btrfs_buffer_leaf(right_buf);
 	free_space = btrfs_leaf_free_space(root, right);
 	if (free_space < data_size + sizeof(struct btrfs_item)) {
 		btrfs_block_release(root, right_buf);
@@ -881,11 +886,11 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 	left_nritems -= push_items;
 	btrfs_set_header_nritems(&left->header, left_nritems);
 
-	BUG_ON(list_empty(&left_buf->dirty));
-	BUG_ON(list_empty(&right_buf->dirty));
-	memcpy(&upper->node.ptrs[slot + 1].key,
+	BUG_ON(!buffer_dirty(left_buf));
+	BUG_ON(!buffer_dirty(right_buf));
+	memcpy(&upper_node->ptrs[slot + 1].key,
 		&right->items[0].key, sizeof(struct btrfs_disk_key));
-	BUG_ON(list_empty(&upper->dirty));
+	BUG_ON(!buffer_dirty(upper));
 
 	/* then fixup the leaf pointer in the path */
 	if (path->slots[0] >= left_nritems) {
@@ -905,9 +910,9 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 			  *root, struct btrfs_path *path, int data_size)
 {
-	struct btrfs_buffer *right_buf = path->nodes[0];
-	struct btrfs_leaf *right = &right_buf->leaf;
-	struct btrfs_buffer *t;
+	struct buffer_head *right_buf = path->nodes[0];
+	struct btrfs_leaf *right = btrfs_buffer_leaf(right_buf);
+	struct buffer_head *t;
 	struct btrfs_leaf *left;
 	int slot;
 	int i;
@@ -926,9 +931,9 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (!path->nodes[1]) {
 		return 1;
 	}
-	t = read_tree_block(root, btrfs_node_blockptr(&path->nodes[1]->node,
-						      slot - 1));
-	left = &t->leaf;
+	t = read_tree_block(root,
+	    btrfs_node_blockptr(btrfs_buffer_node(path->nodes[1]), slot - 1));
+	left = btrfs_buffer_leaf(t);
 	free_space = btrfs_leaf_free_space(root, left);
 	if (free_space < data_size + sizeof(struct btrfs_item)) {
 		btrfs_block_release(root, t);
@@ -937,7 +942,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 
 	/* cow and double check */
 	btrfs_cow_block(trans, root, t, path->nodes[1], slot - 1, &t);
-	left = &t->leaf;
+	left = btrfs_buffer_leaf(t);
 	free_space = btrfs_leaf_free_space(root, left);
 	if (free_space < data_size + sizeof(struct btrfs_item)) {
 		btrfs_block_release(root, t);
@@ -999,8 +1004,8 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 		push_space = btrfs_item_offset(right->items + i);
 	}
 
-	BUG_ON(list_empty(&t->dirty));
-	BUG_ON(list_empty(&right_buf->dirty));
+	BUG_ON(!buffer_dirty(t));
+	BUG_ON(!buffer_dirty(right_buf));
 
 	wret = fixup_low_keys(trans, root, path, &right->items[0].key, 1);
 	if (wret)
@@ -1029,13 +1034,13 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, struct btrfs_path *path, int data_size)
 {
-	struct btrfs_buffer *l_buf;
+	struct buffer_head *l_buf;
 	struct btrfs_leaf *l;
 	u32 nritems;
 	int mid;
 	int slot;
 	struct btrfs_leaf *right;
-	struct btrfs_buffer *right_buffer;
+	struct buffer_head *right_buffer;
 	int space_needed = data_size + sizeof(struct btrfs_item);
 	int data_copy_size;
 	int rt_data_off;
@@ -1053,7 +1058,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 			return wret;
 	}
 	l_buf = path->nodes[0];
-	l = &l_buf->leaf;
+	l = btrfs_buffer_leaf(l_buf);
 
 	/* did the pushes work? */
 	if (btrfs_leaf_free_space(root, l) >=
@@ -1071,7 +1076,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	right_buffer = btrfs_alloc_free_block(trans, root);
 	BUG_ON(!right_buffer);
 	BUG_ON(mid == nritems);
-	right = &right_buffer->leaf;
+	right = btrfs_buffer_leaf(right_buffer);
 	memset(&right->header, 0, sizeof(right->header));
 	if (mid <= slot) {
 		/* FIXME, just alloc a new leaf here */
@@ -1085,10 +1090,10 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 			BUG();
 	}
 	btrfs_set_header_nritems(&right->header, nritems - mid);
-	btrfs_set_header_blocknr(&right->header, right_buffer->blocknr);
+	btrfs_set_header_blocknr(&right->header, right_buffer->b_blocknr);
 	btrfs_set_header_level(&right->header, 0);
 	btrfs_set_header_parentid(&right->header,
-	                       btrfs_header_parentid(&root->node->node.header));
+	      btrfs_header_parentid(btrfs_buffer_header(root->node)));
 	data_copy_size = btrfs_item_end(l->items + mid) -
 			 leaf_data_end(root, l);
 	memcpy(right->items, l->items + mid,
@@ -1107,11 +1112,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_set_header_nritems(&l->header, mid);
 	ret = 0;
 	wret = insert_ptr(trans, root, path, &right->items[0].key,
-			  right_buffer->blocknr, path->slots[1] + 1, 1);
+			  right_buffer->b_blocknr, path->slots[1] + 1, 1);
 	if (wret)
 		ret = wret;
-	BUG_ON(list_empty(&right_buffer->dirty));
-	BUG_ON(list_empty(&l_buf->dirty));
+	BUG_ON(!buffer_dirty(right_buffer));
+	BUG_ON(!buffer_dirty(l_buf));
 	BUG_ON(path->slots[0] != slot);
 	if (mid <= slot) {
 		btrfs_block_release(root, path->nodes[0]);
@@ -1136,7 +1141,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	int slot;
 	int slot_orig;
 	struct btrfs_leaf *leaf;
-	struct btrfs_buffer *leaf_buf;
+	struct buffer_head *leaf_buf;
 	u32 nritems;
 	unsigned int data_end;
 	struct btrfs_disk_key disk_key;
@@ -1156,7 +1161,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 
 	slot_orig = path->slots[0];
 	leaf_buf = path->nodes[0];
-	leaf = &leaf_buf->leaf;
+	leaf = btrfs_buffer_leaf(leaf_buf);
 
 	nritems = btrfs_header_nritems(&leaf->header);
 	data_end = leaf_data_end(root, leaf);
@@ -1202,7 +1207,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (slot == 0)
 		ret = fixup_low_keys(trans, root, path, &disk_key, 1);
 
-	BUG_ON(list_empty(&leaf_buf->dirty));
+	BUG_ON(!buffer_dirty(leaf_buf));
 	if (btrfs_leaf_free_space(root, leaf) < 0)
 		BUG();
 	check_leaf(root, path, 0);
@@ -1225,7 +1230,8 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_init_path(&path);
 	ret = btrfs_insert_empty_item(trans, root, &path, cpu_key, data_size);
 	if (!ret) {
-		ptr = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], u8);
+		ptr = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
+				     path.slots[0], u8);
 		memcpy(ptr, data, data_size);
 	}
 	btrfs_release_path(root, &path);
@@ -1243,12 +1249,12 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		   struct btrfs_path *path, int level, int slot)
 {
 	struct btrfs_node *node;
-	struct btrfs_buffer *parent = path->nodes[level];
+	struct buffer_head *parent = path->nodes[level];
 	u32 nritems;
 	int ret = 0;
 	int wret;
 
-	node = &parent->node;
+	node = btrfs_buffer_node(parent);
 	nritems = btrfs_header_nritems(&node->header);
 	if (slot != nritems -1) {
 		memmove(node->ptrs + slot, node->ptrs + slot + 1,
@@ -1257,16 +1263,17 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	nritems--;
 	btrfs_set_header_nritems(&node->header, nritems);
 	if (nritems == 0 && parent == root->node) {
-		BUG_ON(btrfs_header_level(&root->node->node.header) != 1);
+		struct btrfs_header *header = btrfs_buffer_header(root->node);
+		BUG_ON(btrfs_header_level(header) != 1);
 		/* just turn the root into a leaf and break */
-		btrfs_set_header_level(&root->node->node.header, 0);
+		btrfs_set_header_level(header, 0);
 	} else if (slot == 0) {
 		wret = fixup_low_keys(trans, root, path, &node->ptrs[0].key,
 				      level + 1);
 		if (wret)
 			ret = wret;
 	}
-	BUG_ON(list_empty(&parent->dirty));
+	BUG_ON(!buffer_dirty(parent));
 	return ret;
 }
 
@@ -1279,7 +1286,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 {
 	int slot;
 	struct btrfs_leaf *leaf;
-	struct btrfs_buffer *leaf_buf;
+	struct buffer_head *leaf_buf;
 	int doff;
 	int dsize;
 	int ret = 0;
@@ -1287,7 +1294,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	u32 nritems;
 
 	leaf_buf = path->nodes[0];
-	leaf = &leaf_buf->leaf;
+	leaf = btrfs_buffer_leaf(leaf_buf);
 	slot = path->slots[0];
 	doff = btrfs_item_offset(leaf->items + slot);
 	dsize = btrfs_item_size(leaf->items + slot);
@@ -1313,14 +1320,13 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	if (nritems == 0) {
 		if (leaf_buf == root->node) {
 			btrfs_set_header_level(&leaf->header, 0);
-			BUG_ON(list_empty(&leaf_buf->dirty));
 		} else {
 			clean_tree_block(trans, root, leaf_buf);
 			wret = del_ptr(trans, root, path, 1, path->slots[1]);
 			if (wret)
 				ret = wret;
 			wret = btrfs_free_extent(trans, root,
-						 leaf_buf->blocknr, 1, 1);
+						 leaf_buf->b_blocknr, 1, 1);
 			if (wret)
 				ret = wret;
 		}
@@ -1332,7 +1338,6 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 			if (wret)
 				ret = wret;
 		}
-		BUG_ON(list_empty(&leaf_buf->dirty));
 
 		/* delete the leaf if it is mostly empty */
 		if (used < BTRFS_LEAF_DATA_SIZE(root) / 3) {
@@ -1341,7 +1346,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 			 * for possible call to del_ptr below
 			 */
 			slot = path->slots[1];
-			leaf_buf->count++;
+			get_bh(leaf_buf);
 			wret = push_leaf_left(trans, root, path, 1);
 			if (wret < 0)
 				ret = wret;
@@ -1352,7 +1357,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 					ret = wret;
 			}
 			if (btrfs_header_nritems(&leaf->header) == 0) {
-				u64 blocknr = leaf_buf->blocknr;
+				u64 blocknr = leaf_buf->b_blocknr;
 				clean_tree_block(trans, root, leaf_buf);
 				wret = del_ptr(trans, root, path, 1, slot);
 				if (wret)
@@ -1380,19 +1385,21 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 	int slot;
 	int level = 1;
 	u64 blocknr;
-	struct btrfs_buffer *c;
-	struct btrfs_buffer *next = NULL;
+	struct buffer_head *c;
+	struct btrfs_node *c_node;
+	struct buffer_head *next = NULL;
 
 	while(level < BTRFS_MAX_LEVEL) {
 		if (!path->nodes[level])
 			return 1;
 		slot = path->slots[level] + 1;
 		c = path->nodes[level];
-		if (slot >= btrfs_header_nritems(&c->node.header)) {
+		c_node = btrfs_buffer_node(c);
+		if (slot >= btrfs_header_nritems(&c_node->header)) {
 			level++;
 			continue;
 		}
-		blocknr = btrfs_node_blockptr(&c->node, slot);
+		blocknr = btrfs_node_blockptr(c_node, slot);
 		if (next)
 			btrfs_block_release(root, next);
 		next = read_tree_block(root, blocknr);
@@ -1408,7 +1415,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 		if (!level)
 			break;
 		next = read_tree_block(root,
-				       btrfs_node_blockptr(&next->node, 0));
+		       btrfs_node_blockptr(btrfs_buffer_node(next), 0));
 	}
 	return 0;
 }

fs/btrfs/ctree.h

 #ifndef __BTRFS__
 #define __BTRFS__
 
+#include <linux/radix-tree.h>
+#include <linux/fs.h>
+
 struct btrfs_trans_handle;
 
 #define BTRFS_MAGIC "_BtRfS_M"
@@ -10,6 +13,12 @@ struct btrfs_trans_handle;
 #define BTRFS_INODE_MAP_OBJECTID 3
 #define BTRFS_FS_TREE_OBJECTID 4
 
+/*
+ * we can actually store much bigger names, but lets not confuse the rest
+ * of linux
+ */
+#define BTRFS_NAME_LEN 255
+
 /*
  * the key defines the order in the tree, and so it also defines (optimal)
  * block layout.  objectid corresonds to the inode number.  The flags
@@ -57,7 +66,7 @@ struct btrfs_header {
 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
 
-struct btrfs_buffer;
+struct buffer_head;
 /*
  * the super block basically lists the main trees of the FS
  * it currently lacks any block count etc etc
@@ -120,7 +129,7 @@ struct btrfs_node {
  * used while walking the tree.
  */
 struct btrfs_path {
-	struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
+	struct buffer_head *nodes[BTRFS_MAX_LEVEL];
 	int slots[BTRFS_MAX_LEVEL];
 };
 
@@ -211,17 +220,14 @@ struct btrfs_fs_info {
 	struct btrfs_root *inode_root;
 	struct btrfs_key current_insert;
 	struct btrfs_key last_insert;
-	struct radix_tree_root cache_radix;
 	struct radix_tree_root pinned_radix;
-	struct list_head trans;
-	struct list_head cache;
 	u64 last_inode_alloc;
 	u64 last_inode_alloc_dirid;
 	u64 generation;
-	int cache_size;
-	int fp;
 	struct btrfs_trans_handle *running_transaction;
 	struct btrfs_super_block *disk_super;
+	struct buffer_head *sb_buffer;
+	struct super_block *sb;
 };
 
 /*
@@ -230,8 +236,8 @@ struct btrfs_fs_info {
  * only for the extent tree.
  */
 struct btrfs_root {
-	struct btrfs_buffer *node;
-	struct btrfs_buffer *commit_root;
+	struct buffer_head *node;
+	struct buffer_head *commit_root;
 	struct btrfs_root_item root_item;
 	struct btrfs_key root_key;
 	struct btrfs_fs_info *fs_info;
@@ -389,6 +395,29 @@ static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
 	i->compat_flags = cpu_to_le16(val);
 }
 
+static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
+{
+	return le32_to_cpu(ts->sec);
+}
+
+static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
+					  u32 val)
+{
+	ts->sec = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
+{
+	return le32_to_cpu(ts->nsec);
+}
+
+static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
+					  u32 val)
+{
+	ts->nsec = cpu_to_le32(val);
+}
+
+
 
 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
 {
@@ -757,15 +786,20 @@ static inline void btrfs_set_file_extent_num_blocks(struct
 	e->num_blocks = cpu_to_le64(val);
 }
 
+static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
 /* helper function to cast into the data area of the leaf. */
 #define btrfs_item_ptr(leaf, slot, type) \
 	((type *)(btrfs_leaf_data(leaf) + \
 	btrfs_item_offset((leaf)->items + (slot))))
 
-struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 					    struct btrfs_root *root);
 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		  struct btrfs_buffer *buf);
+		  struct buffer_head *buf);
 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, u64 blocknr, u64 num_blocks, int pin);
 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
@@ -783,7 +817,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
-			*root, struct btrfs_buffer *snap);
+			*root, struct buffer_head *snap);
 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
 			       btrfs_root *root);
 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
@@ -800,8 +834,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 			  *root, char *name, int name_len, u64 dir, u64
 			  objectid, u8 type);
 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
-			  *root, struct btrfs_path *path, u64 dir, char *name,
-			  int name_len, int mod);
+			  *root, struct btrfs_path *path, u64 dir,
+			  const char *name, int name_len, int mod);
 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
 			      char *name, int name_len);
 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,

fs/btrfs/dir-item.c

@@ -18,11 +18,6 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	key.objectid = dir;
 	key.flags = 0;
 	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
-	if (name_len == 1 && *name == '.')
-		key.offset = 1;
-	else if (name_len == 2 && name[0] == '.' && name[1] == '.')
-		key.offset = 2;
-	else
 	ret = btrfs_name_hash(name, name_len, &key.offset);
 	BUG_ON(ret);
 	btrfs_init_path(&path);
@@ -31,7 +26,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (ret)
 		goto out;
 
-	dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
+	dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
+				  path.slots[0],
 				  struct btrfs_dir_item);
 	btrfs_set_dir_objectid(dir_item, objectid);
 	btrfs_set_dir_type(dir_item, type);
@@ -45,8 +41,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 }
 
 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
-			  *root, struct btrfs_path *path, u64 dir, char *name,
-			  int name_len, int mod)
+			  *root, struct btrfs_path *path, u64 dir,
+			  const char *name, int name_len, int mod)
 {
 	int ret;
 	struct btrfs_key key;
@@ -69,7 +65,8 @@ int btrfs_match_dir_item_name(struct btrfs_root *root,
 	struct btrfs_dir_item *dir_item;
 	char *name_ptr;
 
-	dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
+	dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+				  path->slots[0],
 				  struct btrfs_dir_item);
 	if (btrfs_dir_name_len(dir_item) != name_len)
 		return 0;

fs/btrfs/disk-io.c

-#define _XOPEN_SOURCE 500
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include "kerncompat.h"
-#include "radix-tree.h"
+#include <linux/module.h>
+#include <linux/fs.h>
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
 
-static int allocated_blocks = 0;
-int cache_max = 10000;
-
-static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf)
+static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
 {
-	if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
+	struct btrfs_node *node = btrfs_buffer_node(buf);
+	if (buf->b_blocknr != btrfs_header_blocknr(&node->header))
 		BUG();
-	if (root->node && btrfs_header_parentid(&buf->node.header) !=
-	    btrfs_header_parentid(&root->node->node.header))
+	if (root->node && btrfs_header_parentid(&node->header) !=
+	    btrfs_header_parentid(btrfs_buffer_header(root->node)))
 		BUG();
 	return 0;
 }
 
-static int free_some_buffers(struct btrfs_root *root)
+struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
 {
-	struct list_head *node, *next;
-	struct btrfs_buffer *b;
-	if (root->fs_info->cache_size < cache_max)
-		return 0;
-	list_for_each_safe(node, next, &root->fs_info->cache) {
-		b = list_entry(node, struct btrfs_buffer, cache);
-		if (b->count == 1) {
-			BUG_ON(!list_empty(&b->dirty));
-			list_del_init(&b->cache);
-			btrfs_block_release(root, b);
-			if (root->fs_info->cache_size < cache_max)
-				break;
-		}
-	}
-	return 0;
-}
-
-struct btrfs_buffer *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
-{
-	struct btrfs_buffer *buf;
-	int ret;
-
-	buf = malloc(sizeof(struct btrfs_buffer) + root->blocksize);
-	if (!buf)
-		return buf;
-	allocated_blocks++;
-	buf->blocknr = blocknr;
-	buf->count = 2;
-	INIT_LIST_HEAD(&buf->dirty);
-	free_some_buffers(root);
-	radix_tree_preload(GFP_KERNEL);
-	ret = radix_tree_insert(&root->fs_info->cache_radix, blocknr, buf);
-	radix_tree_preload_end();
-	list_add_tail(&buf->cache, &root->fs_info->cache);
-	root->fs_info->cache_size++;
-	if (ret) {
-		free(buf);
-		return NULL;
-	}
-	return buf;
+	return sb_getblk(root->fs_info->sb, blocknr);
 }
 
-struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr)
+struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr)
 {
-	struct btrfs_buffer *buf;
-	buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
-	if (buf) {
-		buf->count++;
-	} else {
-		buf = alloc_tree_block(root, blocknr);
-		if (!buf) {
-			BUG();
-			return NULL;
-		}
-	}
-	return buf;
+	return sb_getblk(root->fs_info->sb, blocknr);
 }
 
-struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr)
+struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
 {
-	loff_t offset = blocknr * root->blocksize;
-	struct btrfs_buffer *buf;
-	int ret;
+	struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr);
 
-	buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
-	if (buf) {
-		buf->count++;
-	} else {
-		buf = alloc_tree_block(root, blocknr);
 	if (!buf)
-			return NULL;
-		ret = pread(root->fs_info->fp, &buf->node, root->blocksize,
-			    offset);
-		if (ret != root->blocksize) {
-			free(buf);
-			return NULL;
-		}
-	}
+		return buf;
 	if (check_tree_block(root, buf))
 		BUG();
 	return buf;
 }
 
 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		     struct btrfs_buffer *buf)
+		     struct buffer_head *buf)
 {
-	if (!list_empty(&buf->dirty))
-		return 0;
-	list_add_tail(&buf->dirty, &root->fs_info->trans);
-	buf->count++;
+	mark_buffer_dirty(buf);
 	return 0;
 }
 
 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		     struct btrfs_buffer *buf)
+		     struct buffer_head *buf)
 {
-	if (!list_empty(&buf->dirty)) {
-		list_del_init(&buf->dirty);
-		btrfs_block_release(root, buf);
-	}
+	clear_buffer_dirty(buf);
 	return 0;
 }
 
 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		     struct btrfs_buffer *buf)
+		     struct buffer_head *buf)
 {
-	u64 blocknr = buf->blocknr;
-	loff_t offset = blocknr * root->blocksize;
-	int ret;
-
-	if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
-		BUG();
-	ret = pwrite(root->fs_info->fp, &buf->node, root->blocksize, offset);
-	if (ret != root->blocksize)
-		return ret;
+	mark_buffer_dirty(buf);
 	return 0;
 }
 
 static int __commit_transaction(struct btrfs_trans_handle *trans, struct
 				btrfs_root *root)
 {
-	struct btrfs_buffer *b;
-	int ret = 0;
-	int wret;
-	while(!list_empty(&root->fs_info->trans)) {
-		b = list_entry(root->fs_info->trans.next, struct btrfs_buffer,
-			       dirty);
-		list_del_init(&b->dirty);
-		wret = write_tree_block(trans, root, b);
-		if (wret)
-			ret = wret;
-		btrfs_block_release(root, b);
-	}
-	return ret;
+	filemap_write_and_wait(root->fs_info->sb->s_bdev->bd_inode->i_mapping);
+	return 0;
 }
 
 static int commit_tree_roots(struct btrfs_trans_handle *trans,
@@ -172,17 +74,17 @@ static int commit_tree_roots(struct btrfs_trans_handle *trans,
 	struct btrfs_root *inode_root = fs_info->inode_root;
 
 	btrfs_set_root_blocknr(&inode_root->root_item,
-			       inode_root->node->blocknr);
+			       inode_root->node->b_blocknr);
 	ret = btrfs_update_root(trans, tree_root,
 				&inode_root->root_key,
 				&inode_root->root_item);
 	BUG_ON(ret);
 	while(1) {
 		old_extent_block = btrfs_root_blocknr(&extent_root->root_item);
-		if (old_extent_block == extent_root->node->blocknr)
+		if (old_extent_block == extent_root->node->b_blocknr)
 			break;
 		btrfs_set_root_blocknr(&extent_root->root_item,
-				       extent_root->node->blocknr);
+				       extent_root->node->b_blocknr);
 		ret = btrfs_update_root(trans, tree_root,
 					&extent_root->root_key,
 					&extent_root->root_item);
@@ -195,7 +97,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
 			     btrfs_root *root, struct btrfs_super_block *s)
 {
 	int ret = 0;
-	struct btrfs_buffer *snap = root->commit_root;
+	struct buffer_head *snap = root->commit_root;
 	struct btrfs_key snap_key;
 
 	if (root->commit_root == root->node)
@@ -204,7 +106,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
 	memcpy(&snap_key, &root->root_key, sizeof(snap_key));
 	root->root_key.offset++;
 
-	btrfs_set_root_blocknr(&root->root_item, root->node->blocknr);
+	btrfs_set_root_blocknr(&root->root_item, root->node->b_blocknr);
 	ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 				&root->root_key, &root->root_item);
 	BUG_ON(ret);
@@ -220,7 +122,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
 	btrfs_finish_extent_commit(trans, root->fs_info->tree_root);
 
 	root->commit_root = root->node;
-	root->node->count++;
+	get_bh(root->node);
 	ret = btrfs_drop_snapshot(trans, root, snap);
 	BUG_ON(ret);
 
@@ -234,7 +136,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct
 static int __setup_root(struct btrfs_super_block *super,
 			struct btrfs_root *root,
 			struct btrfs_fs_info *fs_info,
-			u64 objectid, int fp)
+			u64 objectid)
 {
 	root->node = NULL;
 	root->commit_root = NULL;
@@ -250,11 +152,11 @@ static int find_and_setup_root(struct btrfs_super_block *super,
 			       struct btrfs_root *tree_root,
 			       struct btrfs_fs_info *fs_info,
 			       u64 objectid,
-			       struct btrfs_root *root, int fp)
+			       struct btrfs_root *root)
 {
 	int ret;
 
-	__setup_root(super, root, fs_info, objectid, fp);
+	__setup_root(super, root, fs_info, objectid);
 	ret = btrfs_find_last_root(tree_root, objectid,
 				   &root->root_item, &root->root_key);
 	BUG_ON(ret);
@@ -265,32 +167,26 @@ static int find_and_setup_root(struct btrfs_super_block *super,
 	return 0;
 }
 
-struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super)
-{
-	int fp;
-
-	fp = open(filename, O_CREAT | O_RDWR, 0600);
-	if (fp < 0) {
-		return NULL;
-	}
-	return open_ctree_fd(fp, super);
-}
-
-struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
+struct btrfs_root *open_ctree(struct super_block *sb,
+			      struct buffer_head *sb_buffer,
+			      struct btrfs_super_block *disk_super)
 {
-	struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *inode_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
+	struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
+					  GFP_NOFS);
+	struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
+						 GFP_NOFS);
+	struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
+					       GFP_NOFS);
+	struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
+						GFP_NOFS);
+	struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
+						GFP_NOFS);
 	int ret;
 
-	INIT_RADIX_TREE(&fs_info->cache_radix, GFP_KERNEL);
+	/* FIXME: don't be stupid */
+	if (!btrfs_super_root(disk_super))
+		return NULL;
 	INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
-	INIT_LIST_HEAD(&fs_info->trans);
-	INIT_LIST_HEAD(&fs_info->cache);
-	fs_info->cache_size = 0;
-	fs_info->fp = fp;
 	fs_info->running_transaction = NULL;
 	fs_info->fs_root = root;
 	fs_info->tree_root = tree_root;
@@ -298,36 +194,31 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
 	fs_info->inode_root = inode_root;
 	fs_info->last_inode_alloc = 0;
 	fs_info->last_inode_alloc_dirid = 0;
-	fs_info->disk_super = super;
+	fs_info->disk_super = disk_super;
+	fs_info->sb_buffer = sb_buffer;
+	fs_info->sb = sb;
 	memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
 	memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
 
-	ret = pread(fp, super, sizeof(struct btrfs_super_block),
-		     BTRFS_SUPER_INFO_OFFSET);
-	if (ret == 0 || btrfs_super_root(super) == 0) {
-		BUG();
-		return NULL;
-	}
-	BUG_ON(ret < 0);
-
-	__setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp);
-	tree_root->node = read_tree_block(tree_root, btrfs_super_root(super));
+	__setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+	tree_root->node = read_tree_block(tree_root,
+					  btrfs_super_root(disk_super));
 	BUG_ON(!tree_root->node);
 
-	ret = find_and_setup_root(super, tree_root, fs_info,
-				  BTRFS_EXTENT_TREE_OBJECTID, extent_root, fp);
+	ret = find_and_setup_root(disk_super, tree_root, fs_info,
+				  BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 	BUG_ON(ret);
 
-	ret = find_and_setup_root(super, tree_root, fs_info,
-				  BTRFS_INODE_MAP_OBJECTID, inode_root, fp);
+	ret = find_and_setup_root(disk_super, tree_root, fs_info,
+				  BTRFS_INODE_MAP_OBJECTID, inode_root);
 	BUG_ON(ret);
 
-	ret = find_and_setup_root(super, tree_root, fs_info,
-				  BTRFS_FS_TREE_OBJECTID, root, fp);
+	ret = find_and_setup_root(disk_super, tree_root, fs_info,
+				  BTRFS_FS_TREE_OBJECTID, root);
 	BUG_ON(ret);
 
 	root->commit_root = root->node;
-	root->node->count++;
+	get_bh(root->node);
 	root->ref_cows = 1;
 	root->fs_info->generation = root->root_key.offset + 1;
 	return root;
@@ -336,8 +227,11 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super)
 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, struct btrfs_super_block *s)
 {
+	return 0;
+#if 0
 	int ret;
-	btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr);
+	btrfs_set_super_root(s, root->fs_info->tree_root->node->b_blocknr);
+
 	ret = pwrite(root->fs_info->fp, s, sizeof(*s),
 		     BTRFS_SUPER_INFO_OFFSET);
 	if (ret != sizeof(*s)) {
@@ -345,35 +239,38 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
 		return ret;
 	}
 	return 0;
+#endif
 }
 
 static int drop_cache(struct btrfs_root *root)
 {
+	return 0;
+#if 0
 	while(!list_empty(&root->fs_info->cache)) {
-		struct btrfs_buffer *b = list_entry(root->fs_info->cache.next,
-						    struct btrfs_buffer,
+		struct buffer_head *b = list_entry(root->fs_info->cache.next,
+						    struct buffer_head,
 						    cache);
 		list_del_init(&b->cache);
 		btrfs_block_release(root, b);
 	}
 	return 0;
+#endif
 }
-int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s)
+
+int close_ctree(struct btrfs_root *root)
 {
 	int ret;
 	struct btrfs_trans_handle *trans;
 
 	trans = root->fs_info->running_transaction;
-	btrfs_commit_transaction(trans, root, s);
+	btrfs_commit_transaction(trans, root, root->fs_info->disk_super);
 	ret = commit_tree_roots(trans, root->fs_info);
 	BUG_ON(ret);
 	ret = __commit_transaction(trans, root);
 	BUG_ON(ret);
-	write_ctree_super(trans, root, s);
+	write_ctree_super(trans, root, root->fs_info->disk_super);
 	drop_cache(root);
-	BUG_ON(!list_empty(&root->fs_info->trans));
 
-	close(root->fs_info->fp);
 	if (root->node)
 		btrfs_block_release(root, root->node);
 	if (root->fs_info->extent_root->node)
@@ -386,29 +283,17 @@ int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s)
 		btrfs_block_release(root->fs_info->tree_root,
 				    root->fs_info->tree_root->node);
 	btrfs_block_release(root, root->commit_root);
-	free(root);
-	printf("on close %d blocks are allocated\n", allocated_blocks);
+	btrfs_block_release(root, root->fs_info->sb_buffer);
+	kfree(root->fs_info->extent_root);
+	kfree(root->fs_info->inode_root);
+	kfree(root->fs_info->tree_root);
+	kfree(root->fs_info);
+	kfree(root);
 	return 0;
 }
 
-void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf)
+void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
 {
-	buf->count--;
-	if (buf->count < 0)
-		BUG();
-	if (buf->count == 0) {
-		BUG_ON(!list_empty(&buf->cache));
-		BUG_ON(!list_empty(&buf->dirty));
-		if (!radix_tree_lookup(&root->fs_info->cache_radix,
-				       buf->blocknr))
-			BUG();
-		radix_tree_delete(&root->fs_info->cache_radix, buf->blocknr);
-		memset(buf, 0, sizeof(*buf));
-		free(buf);
-		BUG_ON(allocated_blocks == 0);
-		allocated_blocks--;
-		BUG_ON(root->fs_info->cache_size == 0);
-		root->fs_info->cache_size--;
-	}
+	brelse(buf);
 }
 

fs/btrfs/disk-io.h

 #ifndef __DISKIO__
 #define __DISKIO__
-#include "list.h"
 
-struct btrfs_buffer {
-	u64 blocknr;
-	int count;
-	struct list_head dirty;
-	struct list_head cache;
-	union {
-		struct btrfs_node node;
-		struct btrfs_leaf leaf;
-	};
-};
+#include <linux/buffer_head.h>
 
-struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr);
-struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr);
+#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
+
+static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
+{
+	return (struct btrfs_node *)bh->b_data;
+}
+
+static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh)
+{
+	return (struct btrfs_leaf *)bh->b_data;
+}
+
+static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh)
+{
+	return &((struct btrfs_node *)bh->b_data)->header;
+}
+
+struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr);
+struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr);
 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		     struct btrfs_buffer *buf);
+		     struct buffer_head *buf);
 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		     struct btrfs_buffer *buf);
+		     struct buffer_head *buf);
 int clean_tree_block(struct btrfs_trans_handle *trans,
-		     struct btrfs_root *root, struct btrfs_buffer *buf);
+		     struct btrfs_root *root, struct buffer_head *buf);
 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
 			     *root, struct btrfs_super_block *s);
-struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *s);
-struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super);
-int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s);
-void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf);
+struct btrfs_root *open_ctree(struct super_block *sb,
+			      struct buffer_head *sb_buffer,
+			      struct btrfs_super_block *disk_super);
+int close_ctree(struct btrfs_root *root);
+void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf);
 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		      struct btrfs_super_block *s);
 int mkfs(int fd, u64 num_blocks, u32 blocksize);
-
-#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
-
 #endif

fs/btrfs/extent-tree.c

@@ -10,9 +10,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 			    search_end, struct btrfs_key *ins);
 static int finish_current_insert(struct btrfs_trans_handle *trans, struct
 				 btrfs_root *extent_root);
-static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
-		       *extent_root);
-
+static int del_pending_extents(struct btrfs_trans_handle *trans, struct
+			       btrfs_root *extent_root);
 /*
  * pending extents are blocks that we're trying to allocate in the extent
  * map while trying to grow the map because of other allocations.  To avoid
@@ -21,6 +20,7 @@ static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
  * manner for deletes.
  */
 #define CTREE_EXTENT_PENDING_DEL 0
+#define CTREE_EXTENT_PINNED 1
 
 static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
 			 *root, u64 blocknr)
@@ -45,15 +45,14 @@ static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (ret != 0)
 		BUG();
 	BUG_ON(ret != 0);
-	l = &path.nodes[0]->leaf;
+	l = btrfs_buffer_leaf(path.nodes[0]);
 	item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
 	refs = btrfs_extent_refs(item);
 	btrfs_set_extent_refs(item, refs + 1);
 
-	BUG_ON(list_empty(&path.nodes[0]->dirty));
 	btrfs_release_path(root->fs_info->extent_root, &path);
 	finish_current_insert(trans, root->fs_info->extent_root);
-	run_pending(trans, root->fs_info->extent_root);
+	del_pending_extents(trans, root->fs_info->extent_root);
 	return 0;
 }
 
@@ -74,7 +73,7 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
 				0, 0);
 	if (ret != 0)
 		BUG();
-	l = &path.nodes[0]->leaf;
+	l = btrfs_buffer_leaf(path.nodes[0]);
 	item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
 	*refs = btrfs_extent_refs(item);
 	btrfs_release_path(root->fs_info->extent_root, &path);
@@ -82,18 +81,20 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
 }
 
 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		  struct btrfs_buffer *buf)
+		  struct buffer_head *buf)
 {
 	u64 blocknr;
+	struct btrfs_node *buf_node;
 	int i;
 
 	if (!root->ref_cows)
 		return 0;
-	if (btrfs_is_leaf(&buf->node))
+	buf_node = btrfs_buffer_node(buf);
+	if (btrfs_is_leaf(buf_node))
 		return 0;
 
-	for (i = 0; i < btrfs_header_nritems(&buf->node.header); i++) {
-		blocknr = btrfs_node_blockptr(&buf->node, i);
+	for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) {
+		blocknr = btrfs_node_blockptr(buf_node, i);
 		inc_block_ref(trans, root, blocknr);
 	}
 	return 0;
@@ -108,9 +109,10 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
 	int i;
 
 	while(1) {
-		ret = radix_tree_gang_lookup(&root->fs_info->pinned_radix,
+		ret = radix_tree_gang_lookup_tag(&root->fs_info->pinned_radix,
 					     (void **)gang, 0,
-					     ARRAY_SIZE(gang));
+					     ARRAY_SIZE(gang),
+					     CTREE_EXTENT_PINNED);
 		if (!ret)
 			break;
 		if (!first)
@@ -137,7 +139,7 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
 
 	btrfs_set_extent_refs(&extent_item, 1);
 	btrfs_set_extent_owner(&extent_item,
-		btrfs_header_parentid(&extent_root->node->node.header));
+		btrfs_header_parentid(btrfs_buffer_header(extent_root->node)));
 	ins.offset = 1;
 	ins.flags = 0;
 	btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
@@ -156,11 +158,24 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
 	return 0;
 }
 
+static int pin_down_block(struct btrfs_root *root, u64 blocknr, int tag)
+{
+	int err;
+	err = radix_tree_insert(&root->fs_info->pinned_radix,
+				blocknr, (void *)blocknr);
+	BUG_ON(err);
+	if (err)
+		return err;
+	radix_tree_tag_set(&root->fs_info->pinned_radix, blocknr,
+			   tag);
+	return 0;
+}
+
 /*
  * remove an extent from the root, returns 0 on success
  */
 static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
-			 *root, u64 blocknr, u64 num_blocks, int pin)
+			 *root, u64 blocknr, u64 num_blocks)
 {
 	struct btrfs_path path;
 	struct btrfs_key key;
@@ -171,7 +186,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 	struct btrfs_key ins;
 	u32 refs;
 
-	BUG_ON(pin && num_blocks != 1);
 	key.objectid = blocknr;
 	key.flags = 0;
 	btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
@@ -186,26 +200,18 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 		printk("failed to find %Lu\n", key.objectid);
 		BUG();
 	}
-	ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
+	ei = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
 			    struct btrfs_extent_item);
 	BUG_ON(ei->refs == 0);
 	refs = btrfs_extent_refs(ei) - 1;
 	btrfs_set_extent_refs(ei, refs);
 	if (refs == 0) {
 		u64 super_blocks_used;
-		if (pin) {
-			int err;
-			radix_tree_preload(GFP_KERNEL);
-			err = radix_tree_insert(&info->pinned_radix,
-						blocknr, (void *)blocknr);
-			BUG_ON(err);
-			radix_tree_preload_end();
-		}
 		super_blocks_used = btrfs_super_blocks_used(info->disk_super);
 		btrfs_set_super_blocks_used(info->disk_super,
 					    super_blocks_used - num_blocks);
 		ret = btrfs_del_item(trans, extent_root, &path);
-		if (!pin && extent_root->fs_info->last_insert.objectid >
+		if (extent_root->fs_info->last_insert.objectid >
 		    blocknr)
 			extent_root->fs_info->last_insert.objectid = blocknr;
 		if (ret)
@@ -224,39 +230,32 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
 			       btrfs_root *extent_root)
 {
 	int ret;
-	struct btrfs_buffer *gang[4];
+	int wret;
+	int err = 0;
+	unsigned long gang[4];
 	int i;
+	struct radix_tree_root *radix = &extent_root->fs_info->pinned_radix;
 
 	while(1) {
 		ret = radix_tree_gang_lookup_tag(
-					&extent_root->fs_info->cache_radix,
+					&extent_root->fs_info->pinned_radix,
 					(void **)gang, 0,
 					ARRAY_SIZE(gang),
 					CTREE_EXTENT_PENDING_DEL);
 		if (!ret)
 			break;
 		for (i = 0; i < ret; i++) {
-			ret = __free_extent(trans, extent_root,
-					    gang[i]->blocknr, 1, 1);
-			radix_tree_tag_clear(&extent_root->fs_info->cache_radix,
-					     gang[i]->blocknr,
+			radix_tree_tag_set(radix, gang[i], CTREE_EXTENT_PINNED);
+			radix_tree_tag_clear(radix, gang[i],
 					     CTREE_EXTENT_PENDING_DEL);
-			btrfs_block_release(extent_root, gang[i]);
+			wret = __free_extent(trans, extent_root, gang[i], 1);
+			if (wret)
+				err = wret;
 		}
 	}
-	return 0;
-}
-
-static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root
-		       *extent_root)
-{
-	while(radix_tree_tagged(&extent_root->fs_info->cache_radix,
-				CTREE_EXTENT_PENDING_DEL))
-		del_pending_extents(trans, extent_root);
-	return 0;
+	return err;
 }
 
-
 /*
  * remove an extent from the root, returns 0 on success
  */
@@ -264,18 +263,21 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 		      *root, u64 blocknr, u64 num_blocks, int pin)
 {
 	struct btrfs_root *extent_root = root->fs_info->extent_root;
-	struct btrfs_buffer *t;
+	struct buffer_head *t;
 	int pending_ret;
 	int ret;
 
 	if (root == extent_root) {
 		t = find_tree_block(root, blocknr);
-		radix_tree_tag_set(&root->fs_info->cache_radix, blocknr,
-				   CTREE_EXTENT_PENDING_DEL);
+		pin_down_block(root, blocknr, CTREE_EXTENT_PENDING_DEL);
 		return 0;
 	}
-	ret = __free_extent(trans, root, blocknr, num_blocks, pin);
-	pending_ret = run_pending(trans, root->fs_info->extent_root);
+	if (pin) {
+		ret = pin_down_block(root, blocknr, CTREE_EXTENT_PINNED);
+		BUG_ON(ret);
+	}
+	ret = __free_extent(trans, root, blocknr, num_blocks);
+	pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
 	return ret ? ret : pending_ret;
 }
 
@@ -296,14 +298,16 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 	int ret;
 	u64 hole_size = 0;
 	int slot = 0;
-	u64 last_block;
+	u64 last_block = 0;
 	u64 test_block;
 	int start_found;
 	struct btrfs_leaf *l;
 	struct btrfs_root * root = orig_root->fs_info->extent_root;
 	int total_needed = num_blocks;
+	int level;
 
-	total_needed += (btrfs_header_level(&root->node->node.header) + 1) * 3;
+	level = btrfs_header_level(btrfs_buffer_header(root->node));
+	total_needed += (level + 1) * 3;
 	if (root->fs_info->last_insert.objectid > search_start)
 		search_start = root->fs_info->last_insert.objectid;
 
@@ -323,7 +327,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 		path.slots[0]--;
 
 	while (1) {
-		l = &path.nodes[0]->leaf;
+		l = btrfs_buffer_leaf(path.nodes[0]);
 		slot = path.slots[0];
 		if (slot >= btrfs_header_nritems(&l->header)) {
 			ret = btrfs_next_leaf(root, &path);
@@ -429,7 +433,7 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 				sizeof(extent_item));
 
 	finish_current_insert(trans, extent_root);
-	pending_ret = run_pending(trans, extent_root);
+	pending_ret = del_pending_extents(trans, extent_root);
 	if (ret)
 		return ret;
 	if (pending_ret)
@@ -441,16 +445,15 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
  * helper function to allocate a block for a given tree
  * returns the tree buffer or NULL.
  */
-struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 					    struct btrfs_root *root)
 {
 	struct btrfs_key ins;
 	int ret;
-	struct btrfs_buffer *buf;
+	struct buffer_head *buf;
 
 	ret = alloc_extent(trans, root, 1, 0, (unsigned long)-1,
-			   btrfs_header_parentid(&root->node->node.header),
-			   &ins);
+		btrfs_header_parentid(btrfs_buffer_header(root->node)), &ins);
 	if (ret) {
 		BUG();
 		return NULL;
@@ -467,13 +470,13 @@ struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
 			  *root, struct btrfs_path *path, int *level)
 {
-	struct btrfs_buffer *next;
-	struct btrfs_buffer *cur;
+	struct buffer_head *next;
+	struct buffer_head *cur;
 	u64 blocknr;
 	int ret;
 	u32 refs;
 
-	ret = lookup_block_ref(trans, root, path->nodes[*level]->blocknr,
+	ret = lookup_block_ref(trans, root, path->nodes[*level]->b_blocknr,
 			       &refs);
 	BUG_ON(ret);
 	if (refs > 1)
@@ -484,9 +487,10 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
 	while(*level > 0) {
 		cur = path->nodes[*level];
 		if (path->slots[*level] >=
-		    btrfs_header_nritems(&cur->node.header))
+		    btrfs_header_nritems(btrfs_buffer_header(cur)))
 			break;
-		blocknr = btrfs_node_blockptr(&cur->node, path->slots[*level]);
+		blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur),
+					      path->slots[*level]);
 		ret = lookup_block_ref(trans, root, blocknr, &refs);
 		if (refs != 1 || *level == 1) {
 			path->slots[*level]++;
@@ -499,12 +503,12 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
 		if (path->nodes[*level-1])
 			btrfs_block_release(root, path->nodes[*level-1]);
 		path->nodes[*level-1] = next;
-		*level = btrfs_header_level(&next->node.header);
+		*level = btrfs_header_level(btrfs_buffer_header(next));
 		path->slots[*level] = 0;
 	}
 out:
-	ret = btrfs_free_extent(trans, root, path->nodes[*level]->blocknr, 1,
-				1);
+	ret = btrfs_free_extent(trans, root, path->nodes[*level]->b_blocknr,
+				1, 1);
 	btrfs_block_release(root, path->nodes[*level]);
 	path->nodes[*level] = NULL;
 	*level += 1;
@@ -525,14 +529,14 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
 	int ret;
 	for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
 		slot = path->slots[i];
-		if (slot <
-		    btrfs_header_nritems(&path->nodes[i]->node.header)- 1) {
+		if (slot < btrfs_header_nritems(
+		    btrfs_buffer_header(path->nodes[i])) - 1) {
 			path->slots[i]++;
 			*level = i;
 			return 0;
 		} else {
 			ret = btrfs_free_extent(trans, root,
-						path->nodes[*level]->blocknr,
+						path->nodes[*level]->b_blocknr,
 						1, 1);
 			btrfs_block_release(root, path->nodes[*level]);
 			path->nodes[*level] = NULL;
@@ -549,7 +553,7 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
  * decremented.
  */
 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
-			*root, struct btrfs_buffer *snap)
+			*root, struct buffer_head *snap)
 {
 	int ret = 0;
 	int wret;
@@ -560,7 +564,7 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 
 	btrfs_init_path(&path);
 
-	level = btrfs_header_level(&snap->node.header);
+	level = btrfs_header_level(btrfs_buffer_header(snap));
 	orig_level = level;
 	path.nodes[level] = snap;
 	path.slots[level] = 0;

fs/btrfs/hash.c

@@ -10,6 +10,7 @@
  * License.
  */
 
+#include <linux/types.h>
 #define DELTA 0x9E3779B9
 
 static void TEA_transform(__u32 buf[2], __u32 const in[])
@@ -63,6 +64,14 @@ int btrfs_name_hash(const char *name, int len, u64 *hash_result)
 	const char	*p;
 	__u32		in[8], buf[2];
 
+	if (len == 1 && *name == '.') {
+		*hash_result = 1;
+		return 0;
+	} else if (len == 2 && name[0] == '.' && name[1] == '.') {
+		*hash_result = 2;
+		return 0;
+	}
+
 	/* Initialize the default seed for the hash checksum functions */
 	buf[0] = 0x67452301;
 	buf[1] = 0xefcdab89;

fs/btrfs/inode-map.c

@@ -15,7 +15,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 	int ret;
 	u64 hole_size = 0;
 	int slot = 0;
-	u64 last_ino;
+	u64 last_ino = 0;
 	int start_found;
 	struct btrfs_leaf *l;
 	struct btrfs_root *root = fs_root->fs_info->inode_root;
@@ -40,7 +40,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 		path.slots[0]--;
 
 	while (1) {
-		l = &path.nodes[0]->leaf;
+		l = btrfs_buffer_leaf(path.nodes[0]);
 		slot = path.slots[0];
 		if (slot >= btrfs_header_nritems(&l->header)) {
 			ret = btrfs_next_leaf(root, &path);
@@ -105,8 +105,8 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
 	if (ret)
 		goto out;
 
-	inode_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
-				  struct btrfs_inode_map_item);
+	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
+				    path.slots[0], struct btrfs_inode_map_item);
 	btrfs_cpu_key_to_disk(&inode_item->key, location);
 out:
 	btrfs_release_path(inode_root, &path);

fs/btrfs/print-tree.c

@@ -17,7 +17,6 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 	printk("leaf %Lu total ptrs %d free space %d\n",
 		btrfs_header_blocknr(&l->header), nr,
 		btrfs_leaf_free_space(root, l));
-	fflush(stdout);
 	for (i = 0 ; i < nr ; i++) {
 		item = l->items + i;
 		type = btrfs_disk_key_type(&item->key);
@@ -67,10 +66,10 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 				btrfs_leaf_data(l) + btrfs_item_offset(item));
 			break;
 		};
-		fflush(stdout);
 	}
 }
-void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
+
+void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t)
 {
 	int i;
 	u32 nr;
@@ -78,16 +77,16 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
 
 	if (!t)
 		return;
-	c = &t->node;
+	c = btrfs_buffer_node(t);
 	nr = btrfs_header_nritems(&c->header);
 	if (btrfs_is_leaf(c)) {
 		btrfs_print_leaf(root, (struct btrfs_leaf *)c);
 		return;
 	}
-	printk("node %Lu level %d total ptrs %d free spc %u\n", t->blocknr,
+	printk("node %Lu level %d total ptrs %d free spc %u\n",
+	       btrfs_header_blocknr(&c->header),
 	       btrfs_header_level(&c->header), nr,
 	       (u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
-	fflush(stdout);
 	for (i = 0; i < nr; i++) {
 		printk("\tkey %d (%Lu %u %Lu) block %Lu\n",
 		       i,
@@ -95,12 +94,11 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
 		       c->ptrs[i].key.flags,
 		       c->ptrs[i].key.offset,
 		       btrfs_node_blockptr(c, i));
-		fflush(stdout);
 	}
 	for (i = 0; i < nr; i++) {
-		struct btrfs_buffer *next_buf = read_tree_block(root,
+		struct buffer_head *next_buf = read_tree_block(root,
 						btrfs_node_blockptr(c, i));
-		struct btrfs_node *next = &next_buf->node;
+		struct btrfs_node *next = btrfs_buffer_node(next_buf);
 		if (btrfs_is_leaf(next) &&
 		    btrfs_header_level(&c->header) != 1)
 			BUG();

fs/btrfs/print-tree.h

 #ifndef __PRINT_TREE_
 #define __PRINT_TREE_
 void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l);
-void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t);
+void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t);
 #endif

fs/btrfs/root-tree.c

@@ -21,7 +21,7 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
 	if (ret < 0)
 		goto out;
 	BUG_ON(ret == 0);
-	l = &path.nodes[0]->leaf;
+	l = btrfs_buffer_leaf(path.nodes[0]);
 	BUG_ON(path.slots[0] == 0);
 	slot = path.slots[0] - 1;
 	if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
@@ -51,7 +51,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (ret < 0)
 		goto out;
 	BUG_ON(ret != 0);
-	l = &path.nodes[0]->leaf;
+	l = btrfs_buffer_leaf(path.nodes[0]);
 	slot = path.slots[0];
 	memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
 		sizeof(*item));

fs/btrfs/super.c

 #include <linux/module.h>
+#include <linux/buffer_head.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/highmem.h>
@@ -8,13 +9,18 @@
 #include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
 #include "ctree.h"
+#include "disk-io.h"
 
 #define BTRFS_SUPER_MAGIC 0x9123682E
+
+static struct inode_operations btrfs_dir_inode_operations;
+static struct super_operations btrfs_super_ops;
+static struct file_operations btrfs_dir_file_operations;
+
 #if 0
 /* some random number */
 
 static struct super_operations ramfs_ops;
-static struct inode_operations ramfs_dir_inode_operations;
 
 static struct backing_dev_info ramfs_backing_dev_info = {
 	.ra_pages	= 0,	/* No readahead */
@@ -129,46 +135,243 @@ static struct inode_operations ramfs_dir_inode_operations = {
 };
 #endif
 
-struct inode *btrfs_get_inode(struct super_block *sb, int mode, dev_t dev)
+static void btrfs_read_locked_inode(struct inode *inode)
 {
-	struct inode * inode = new_inode(sb);
+	struct btrfs_path path;
+	struct btrfs_inode_item *inode_item;
+	struct btrfs_root *root = btrfs_sb(inode->i_sb);
+	int ret;
+printk("read locked inode %lu\n", inode->i_ino);
+	btrfs_init_path(&path);
+	ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
+	if (ret) {
+		make_bad_inode(inode);
+		return;
+	}
+	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
+				  path.slots[0],
+				  struct btrfs_inode_item);
 
-	if (inode) {
-		inode->i_mode = mode;
-		inode->i_uid = current->fsuid;
-		inode->i_gid = current->fsgid;
-		inode->i_blocks = 0;
-		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+printk("found locked inode %lu\n", inode->i_ino);
+	inode->i_mode = btrfs_inode_mode(inode_item);
+	inode->i_nlink = btrfs_inode_nlink(inode_item);
+	inode->i_uid = btrfs_inode_uid(inode_item);
+	inode->i_gid = btrfs_inode_gid(inode_item);
+	inode->i_size = btrfs_inode_size(inode_item);
+	inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
+	inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
+	inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
+	inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
+	inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
+	inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
+	inode->i_blocks = btrfs_inode_nblocks(inode_item);
+	inode->i_generation = btrfs_inode_generation(inode_item);
+printk("about to release\n");
+	btrfs_release_path(root, &path);
+	switch (inode->i_mode & S_IFMT) {
+#if 0
+	default:
+		init_special_inode(inode, inode->i_mode,
+				   btrfs_inode_rdev(inode_item));
+		break;
+#endif
+	case S_IFREG:
+printk("inode %lu now a file\n", inode->i_ino);
+		break;
+	case S_IFDIR:
+printk("inode %lu now a directory\n", inode->i_ino);
+		inode->i_op = &btrfs_dir_inode_operations;
+		inode->i_fop = &btrfs_dir_file_operations;
+		break;
+	case S_IFLNK:
+printk("inode %lu now a link\n", inode->i_ino);
+		// inode->i_op = &page_symlink_inode_operations;
+		break;
 	}
-	return inode;
+printk("returning!\n");
+	return;
 }
 
-static struct super_operations btrfs_ops = {
-	.statfs		= simple_statfs,
-	.drop_inode	= generic_delete_inode,
-};
+static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
+			      ino_t *ino)
+{
+	const char *name = dentry->d_name.name;
+	int namelen = dentry->d_name.len;
+	struct btrfs_dir_item *di;
+	struct btrfs_path path;
+	struct btrfs_root *root = btrfs_sb(dir->i_sb);
+	int ret;
+
+	btrfs_init_path(&path);
+	ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
+				    namelen, 0);
+	if (ret) {
+		*ino = 0;
+		goto out;
+	}
+	di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+			    struct btrfs_dir_item);
+	*ino = btrfs_dir_objectid(di);
+out:
+	btrfs_release_path(root, &path);
+	return ret;
+}
+
+static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
+				   struct nameidata *nd)
+{
+	struct inode * inode;
+	ino_t ino;
+	int ret;
+
+	if (dentry->d_name.len > BTRFS_NAME_LEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	ret = btrfs_inode_by_name(dir, dentry, &ino);
+	if (ret < 0)
+		return ERR_PTR(ret);
+	inode = NULL;
+	if (ino) {
+printk("lookup on %.*s returns %lu\n", dentry->d_name.len, dentry->d_name.name, ino);
+		inode = iget(dir->i_sb, ino);
+		if (!inode)
+			return ERR_PTR(-EACCES);
+	}
+	return d_splice_alias(inode, dentry);
+}
+
+static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct btrfs_root *root = btrfs_sb(inode->i_sb);
+	struct btrfs_item *item;
+	struct btrfs_dir_item *di;
+	struct btrfs_key key;
+	struct btrfs_path path;
+	int ret;
+	u32 nritems;
+	struct btrfs_leaf *leaf;
+	int slot;
+	int advance;
+	unsigned char d_type = DT_UNKNOWN;
+	int over;
+
+	key.objectid = inode->i_ino;
+printk("readdir on dir %Lu pos %Lu\n", key.objectid, filp->f_pos);
+	key.flags = 0;
+	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
+	key.offset = filp->f_pos;
+	btrfs_init_path(&path);
+	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+	if (ret < 0) {
+		goto err;
+	}
+printk("first ret %d\n", ret);
+	advance = filp->f_pos > 0 && ret != 0;
+	while(1) {
+		leaf = btrfs_buffer_leaf(path.nodes[0]);
+		nritems = btrfs_header_nritems(&leaf->header);
+		slot = path.slots[0];
+printk("leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
+		if (advance) {
+printk("advancing!\n");
+			if (slot == nritems -1) {
+				ret = btrfs_next_leaf(root, &path);
+				if (ret)
+					break;
+				leaf = btrfs_buffer_leaf(path.nodes[0]);
+				nritems = btrfs_header_nritems(&leaf->header);
+				slot = path.slots[0];
+printk("2leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
+			} else {
+				slot++;
+				path.slots[0]++;
+			}
+		}
+		advance = 1;
+		item = leaf->items + slot;
+printk("item key %Lu %u %Lu\n", btrfs_disk_key_objectid(&item->key),
+       btrfs_disk_key_flags(&item->key), btrfs_disk_key_offset(&item->key));
+		if (btrfs_disk_key_objectid(&item->key) != key.objectid)
+			break;
+		if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
+			continue;
+		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
+printk("filldir name %.*s, objectid %Lu\n", btrfs_dir_name_len(di),
+       (const char *)(di + 1), btrfs_dir_objectid(di));
+		over = filldir(dirent, (const char *)(di + 1),
+			       btrfs_dir_name_len(di),
+			       btrfs_disk_key_offset(&item->key),
+			       btrfs_dir_objectid(di), d_type);
+		if (over)
+			break;
+		filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
+	}
+printk("filldir all done\n");
+	ret = 0;
+err:
+	btrfs_release_path(root, &path);
+	return ret;
+}
+
+static void btrfs_put_super (struct super_block * sb)
+{
+	struct btrfs_root *root = btrfs_sb(sb);
+	int ret;
+
+	ret = close_ctree(root);
+	if (ret) {
+		printk("close ctree returns %d\n", ret);
+	}
+	sb->s_fs_info = NULL;
+}
 
 static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
 {
 	struct inode * inode;
-	struct dentry * root;
+	struct dentry * root_dentry;
+	struct btrfs_super_block *disk_super;
+	struct buffer_head *bh;
+	struct btrfs_root *root;
 
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_blocksize = PAGE_CACHE_SIZE;
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 	sb->s_magic = BTRFS_SUPER_MAGIC;
-	sb->s_op = &btrfs_ops;
+	sb->s_op = &btrfs_super_ops;
 	sb->s_time_gran = 1;
-	inode = btrfs_get_inode(sb, S_IFDIR | 0755, 0);
+
+	bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
+	if (!bh) {
+		printk("btrfs: unable to read on disk super\n");
+		return -EIO;
+	}
+	disk_super = (struct btrfs_super_block *)bh->b_data;
+	root = open_ctree(sb, bh, disk_super);
+	sb->s_fs_info = root;
+	if (!root) {
+		printk("btrfs: open_ctree failed\n");
+		return -EIO;
+	}
+	printk("read in super total blocks %Lu root %Lu\n",
+	       btrfs_super_total_blocks(disk_super),
+	       btrfs_super_root_dir(disk_super));
+
+	inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
 	if (!inode)
 		return -ENOMEM;
+	if (inode->i_state & I_NEW) {
+		btrfs_read_locked_inode(inode);
+		unlock_new_inode(inode);
+	}
 
-	root = d_alloc_root(inode);
-	if (!root) {
+	root_dentry = d_alloc_root(inode);
+	if (!root_dentry) {
 		iput(inode);
 		return -ENOMEM;
 	}
-	sb->s_root = root;
+	sb->s_root = root_dentry;
+
 	return 0;
 }
 
@@ -187,6 +390,24 @@ static struct file_system_type btrfs_fs_type = {
 	.fs_flags	= FS_REQUIRES_DEV,
 };
 
+static struct super_operations btrfs_super_ops = {
+	.statfs		= simple_statfs,
+	.drop_inode	= generic_delete_inode,
+	.put_super	= btrfs_put_super,
+	.read_inode	= btrfs_read_locked_inode,
+};
+
+static struct inode_operations btrfs_dir_inode_operations = {
+	.lookup		= btrfs_lookup,
+};
+
+static struct file_operations btrfs_dir_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.readdir	= btrfs_readdir,
+};
+
+
 static int __init init_btrfs_fs(void)
 {
 	printk("btrfs loaded!\n");

fs/btrfs/transaction.h

@@ -10,7 +10,7 @@ struct btrfs_trans_handle {
 static inline struct btrfs_trans_handle *
 btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
 {
-	struct btrfs_trans_handle *h = malloc(sizeof(*h));
+	struct btrfs_trans_handle *h = kmalloc(sizeof(*h), GFP_NOFS);
 	h->transid = root->root_key.offset;
 	h->blocks_reserved = num_blocks;
 	h->blocks_used = 0;
@@ -21,7 +21,7 @@ static inline void btrfs_free_transaction(struct btrfs_root *root,
 					  struct btrfs_trans_handle *handle)
 {
 	memset(handle, 0, sizeof(*handle));
-	free(handle);
+	kfree(handle);
 }
 
 #endif