Fix btrfs_del_ordered_inode to allow forcing the drop during unlinks

This allows us to delete an unlinked inode with dirty pages from the list
instead of forcing commit to write these out before deleting the inode.
Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ctree.c

@@ -1245,7 +1245,10 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 	int level;
 	int should_reada = p->reada;
 	int lowest_unlock = 1;
+	int blocksize;
 	u8 lowest_level = 0;
+	u64 blocknr;
+	u64 gen;
 
 	lowest_level = p->lowest_level;
 	WARN_ON(lowest_level && ins_len);
@@ -1320,11 +1323,12 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 				reada_for_search(root, p, level, slot,
 						 key->objectid);
 
-			tmp = btrfs_find_tree_block(root,
-					  btrfs_node_blockptr(b, slot),
-					  btrfs_level_size(root, level - 1));
-			if (tmp && btrfs_buffer_uptodate(tmp,
-				   btrfs_node_ptr_generation(b, slot))) {
+			blocknr = btrfs_node_blockptr(b, slot);
+			gen = btrfs_node_ptr_generation(b, slot);
+			blocksize = btrfs_level_size(root, level - 1);
+
+			tmp = btrfs_find_tree_block(root, blocknr, blocksize);
+			if (tmp && btrfs_buffer_uptodate(tmp, gen)) {
 				b = tmp;
 			} else {
 				/*
@@ -1334,6 +1338,10 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
 				 */
 				if (level > 1) {
 					btrfs_release_path(NULL, p);
+					if (tmp)
+						free_extent_buffer(tmp);
+					tmp = read_tree_block(root, blocknr,
+							 blocksize, gen);
 					if (tmp)
 						free_extent_buffer(tmp);
 					goto again;

fs/btrfs/file.c

@@ -976,7 +976,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 
 int btrfs_release_file(struct inode * inode, struct file * filp)
 {
-	btrfs_del_ordered_inode(inode);
+	btrfs_del_ordered_inode(inode, 0);
 	if (filp->private_data)
 		btrfs_ioctl_trans_end(filp);
 	return 0;

fs/btrfs/inode.c

@@ -852,7 +852,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 		 * we don't need to worry about
 		 * data=ordered
 		 */
-		btrfs_del_ordered_inode(inode);
+		btrfs_del_ordered_inode(inode, 1);
 	}
 
 	btrfs_end_transaction(trans, root);
@@ -1276,14 +1276,12 @@ void btrfs_delete_inode(struct inode *inode)
 
 	btrfs_end_transaction(trans, root);
 	btrfs_btree_balance_dirty(root, nr);
-	btrfs_throttle(root);
 	return;
 
 no_delete_lock:
 	nr = trans->blocks_used;
 	btrfs_end_transaction(trans, root);
 	btrfs_btree_balance_dirty(root, nr);
-	btrfs_throttle(root);
 no_delete:
 	clear_inode(inode);
 }

fs/btrfs/ordered-data.c

@@ -254,7 +254,7 @@ static void __btrfs_del_ordered_inode(struct btrfs_ordered_inode_tree *tree,
 	return;
 }
 
-void btrfs_del_ordered_inode(struct inode *inode)
+void btrfs_del_ordered_inode(struct inode *inode, int force)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	u64 root_objectid = root->root_key.objectid;
@@ -263,8 +263,8 @@ void btrfs_del_ordered_inode(struct inode *inode)
 		return;
 	}
 
-	if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
-	    mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
+	if (!force && (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
+	    mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)))
 		return;
 
 	spin_lock(&root->fs_info->new_trans_lock);

fs/btrfs/ordered-data.h

@@ -38,6 +38,6 @@ int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
 int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
 				       u64 *root_objectid, u64 *objectid,
 				       struct inode **inode);
-void btrfs_del_ordered_inode(struct inode *inode);
+void btrfs_del_ordered_inode(struct inode *inode, int force);
 int btrfs_ordered_throttle(struct btrfs_root *root, struct inode *inode);
 #endif