Btrfs: Simplify the logic in alloc_extent_buffer() for existing extent buffer case

alloc_extent_buffer() uses radix_tree_lookup() when radix_tree_insert()
fails with EEXIST. That part of the code is very similar to the code in
find_extent_buffer(). This patch replaces radix_tree_lookup() and
surrounding code in alloc_extent_buffer() with find_extent_buffer().

Note that radix_tree_lookup() does not need to be protected by
tree->buffer_lock. It is protected by eb->refs.

While at it, this patch
  - changes the other usage of radix_tree_lookup() in alloc_extent_buffer()
    with find_extent_buffer() to reduce redundancy.
  - removes the unused argument 'len' to find_extent_buffer().
Signed-Off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Zach Brown <zab@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

fs/btrfs/disk-io.c

@@ -1104,8 +1104,7 @@ struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 {
 	struct inode *btree_inode = root->fs_info->btree_inode;
 	struct extent_buffer *eb;
-	eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
-				bytenr, blocksize);
+	eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, bytenr);
 	return eb;
 }
 

fs/btrfs/extent_io.c

@@ -4486,6 +4486,23 @@ static void mark_extent_buffer_accessed(struct extent_buffer *eb)
 	}
 }
 
+struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+					 		u64 start)
+{
+	struct extent_buffer *eb;
+
+	rcu_read_lock();
+	eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
+	if (eb && atomic_inc_not_zero(&eb->refs)) {
+		rcu_read_unlock();
+		mark_extent_buffer_accessed(eb);
+		return eb;
+	}
+	rcu_read_unlock();
+
+	return NULL;
+}
+
 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 					  u64 start, unsigned long len)
 {
@@ -4499,14 +4516,10 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 	int uptodate = 1;
 	int ret;
 
-	rcu_read_lock();
-	eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
-	if (eb && atomic_inc_not_zero(&eb->refs)) {
-		rcu_read_unlock();
-		mark_extent_buffer_accessed(eb);
+
+	eb = find_extent_buffer(tree, start);
+	if (eb)
 		return eb;
-	}
-	rcu_read_unlock();
 
 	eb = __alloc_extent_buffer(tree, start, len, GFP_NOFS);
 	if (!eb)
@@ -4565,24 +4578,17 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 
 	spin_lock(&tree->buffer_lock);
 	ret = radix_tree_insert(&tree->buffer, start >> PAGE_CACHE_SHIFT, eb);
-	if (ret == -EEXIST) {
-		exists = radix_tree_lookup(&tree->buffer,
-						start >> PAGE_CACHE_SHIFT);
-		if (!atomic_inc_not_zero(&exists->refs)) {
-			spin_unlock(&tree->buffer_lock);
-			radix_tree_preload_end();
-			exists = NULL;
-			goto again;
-		}
 	spin_unlock(&tree->buffer_lock);
 	radix_tree_preload_end();
-		mark_extent_buffer_accessed(exists);
+	if (ret == -EEXIST) {
+		exists = find_extent_buffer(tree, start);
+		if (exists)
 			goto free_eb;
+		else
+			goto again;
 	}
 	/* add one reference for the tree */
 	check_buffer_tree_ref(eb);
-	spin_unlock(&tree->buffer_lock);
-	radix_tree_preload_end();
 
 	/*
 	 * there is a race where release page may have
@@ -4613,23 +4619,6 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 	return exists;
 }
 
-struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
-					 u64 start, unsigned long len)
-{
-	struct extent_buffer *eb;
-
-	rcu_read_lock();
-	eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
-	if (eb && atomic_inc_not_zero(&eb->refs)) {
-		rcu_read_unlock();
-		mark_extent_buffer_accessed(eb);
-		return eb;
-	}
-	rcu_read_unlock();
-
-	return NULL;
-}
-
 static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
 {
 	struct extent_buffer *eb =

fs/btrfs/extent_io.h

@@ -271,7 +271,7 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
-					 u64 start, unsigned long len);
+					 u64 start);
 void free_extent_buffer(struct extent_buffer *eb);
 void free_extent_buffer_stale(struct extent_buffer *eb);
 #define WAIT_NONE	0