btrfs: tests: allocate dummy fs_info and root in test_find_delalloc()

BugLink: https://bugs.launchpad.net/bugs/2065912

commit b2136cc288fce2f24a92f3d656531b2d50ebec5a upstream.

Allocate fs_info and root to have a valid fs_info pointer in case it's
dereferenced by a helper outside of tests, like find_lock_delalloc_range().

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>

Author: kdave

fs/btrfs/tests/extent-io-tests.c

@@ -11,6 +11,7 @@
 #include "btrfs-tests.h"
 #include "../ctree.h"
 #include "../extent_io.h"
+#include "../disk-io.h"
 #include "../btrfs_inode.h"
 
 #define PROCESS_UNLOCK		(1 << 0)
@@ -105,9 +106,11 @@ static void dump_extent_io_tree(const struct extent_io_tree *tree)
 	}
 }
 
-static int test_find_delalloc(u32 sectorsize)
+static int test_find_delalloc(u32 sectorsize, u32 nodesize)
 {
-	struct inode *inode;
+	struct btrfs_fs_info *fs_info;
+	struct btrfs_root *root = NULL;
+	struct inode *inode = NULL;
 	struct extent_io_tree *tmp;
 	struct page *page;
 	struct page *locked_page = NULL;
@@ -121,12 +124,27 @@ static int test_find_delalloc(u32 sectorsize)
 
 	test_msg("running find delalloc tests");
 
+	fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+	if (!fs_info) {
+		test_std_err(TEST_ALLOC_FS_INFO);
+		return -ENOMEM;
+	}
+
+	root = btrfs_alloc_dummy_root(fs_info);
+	if (IS_ERR(root)) {
+		test_std_err(TEST_ALLOC_ROOT);
+		ret = PTR_ERR(root);
+		goto out;
+	}
+
 	inode = btrfs_new_test_inode();
 	if (!inode) {
 		test_std_err(TEST_ALLOC_INODE);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out;
 	}
 	tmp = &BTRFS_I(inode)->io_tree;
+	BTRFS_I(inode)->root = root;
 
 	/*
 	 * Passing NULL as we don't have fs_info but tracepoints are not used
@@ -316,6 +334,8 @@ static int test_find_delalloc(u32 sectorsize)
 	process_page_range(inode, 0, total_dirty - 1,
 			   PROCESS_UNLOCK | PROCESS_RELEASE);
 	iput(inode);
+	btrfs_free_dummy_root(root);
+	btrfs_free_dummy_fs_info(fs_info);
 	return ret;
 }
 
@@ -794,7 +814,7 @@ int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
 
 	test_msg("running extent I/O tests");
 
-	ret = test_find_delalloc(sectorsize);
+	ret = test_find_delalloc(sectorsize, nodesize);
 	if (ret)
 		goto out;