btrfs: tests: unify messages when tests start

- make the messages more visually consistent and use same format
  "running ... test", any error or other warning can be easily spotted

- move some message to the test entry function

- add message to the inode tests

Example output:

[    8.187391] Btrfs loaded, crc32c=crc32c-generic, assert=on, integrity-checker=on, ref-verify=on
[    8.189476] BTRFS: selftest: sectorsize: 4096  nodesize: 4096
[    8.190761] BTRFS: selftest: running btrfs free space cache tests
[    8.192245] BTRFS: selftest: running extent only tests
[    8.193573] BTRFS: selftest: running bitmap only tests
[    8.194876] BTRFS: selftest: running bitmap and extent tests
[    8.196166] BTRFS: selftest: running space stealing from bitmap to extent tests
[    8.198026] BTRFS: selftest: running extent buffer operation tests
[    8.199328] BTRFS: selftest: running btrfs_split_item tests
[    8.200653] BTRFS: selftest: running extent I/O tests
[    8.201808] BTRFS: selftest: running find delalloc tests
[    8.320733] BTRFS: selftest: running extent buffer bitmap tests
[    8.340795] BTRFS: selftest: running inode tests
[    8.341766] BTRFS: selftest: running btrfs_get_extent tests
[    8.342981] BTRFS: selftest: running hole first btrfs_get_extent test
[    8.344342] BTRFS: selftest: running outstanding_extents tests
[    8.345575] BTRFS: selftest: running qgroup tests
[    8.346537] BTRFS: selftest: running qgroup add/remove tests
[    8.347725] BTRFS: selftest: running qgroup multiple refs test
[    8.354982] BTRFS: selftest: running free space tree tests
[    8.372175] BTRFS: selftest: sectorsize: 4096  nodesize: 8192
[    8.373539] BTRFS: selftest: running btrfs free space cache tests
[    8.374989] BTRFS: selftest: running extent only tests
[    8.376236] BTRFS: selftest: running bitmap only tests
[    8.377483] BTRFS: selftest: running bitmap and extent tests
[    8.378854] BTRFS: selftest: running space stealing from bitmap to extent tests
...
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tests/free-space-tests.c

@@ -404,7 +404,7 @@ test_steal_space_from_bitmap_to_extent(struct btrfs_block_group_cache *cache,
 	};
 	const struct btrfs_free_space_op *orig_free_space_ops;
 
-	test_msg("running space stealing from bitmap to extent");
+	test_msg("running space stealing from bitmap to extent tests");
 
 	/*
 	 * For this test, we want to ensure we end up with an extent entry

fs/btrfs/tests/inode-tests.c

@@ -226,6 +226,8 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
 	u64 offset;
 	int ret = -ENOMEM;
 
+	test_msg("running btrfs_get_extent tests");
+
 	inode = btrfs_new_test_inode();
 	if (!inode) {
 		test_std_err(TEST_ALLOC_INODE);
@@ -827,6 +829,8 @@ static int test_hole_first(u32 sectorsize, u32 nodesize)
 	struct extent_map *em = NULL;
 	int ret = -ENOMEM;
 
+	test_msg("running hole first btrfs_get_extent test");
+
 	inode = btrfs_new_test_inode();
 	if (!inode) {
 		test_std_err(TEST_ALLOC_INODE);
@@ -927,6 +931,8 @@ static int test_extent_accounting(u32 sectorsize, u32 nodesize)
 	struct btrfs_root *root = NULL;
 	int ret = -ENOMEM;
 
+	test_msg("running outstanding_extents tests");
+
 	inode = btrfs_new_test_inode();
 	if (!inode) {
 		test_std_err(TEST_ALLOC_INODE);
@@ -1110,17 +1116,16 @@ int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
 {
 	int ret;
 
+	test_msg("running inode tests");
+
 	set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
 	set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
 
-	test_msg("running btrfs_get_extent tests");
 	ret = test_btrfs_get_extent(sectorsize, nodesize);
 	if (ret)
 		return ret;
-	test_msg("running hole first btrfs_get_extent test");
 	ret = test_hole_first(sectorsize, nodesize);
 	if (ret)
 		return ret;
-	test_msg("running outstanding_extents tests");
 	return test_extent_accounting(sectorsize, nodesize);
 }

fs/btrfs/tests/qgroup-tests.c

@@ -215,7 +215,7 @@ static int test_no_shared_qgroup(struct btrfs_root *root,
 
 	btrfs_init_dummy_trans(&trans, fs_info);
 
-	test_msg("qgroup basic add");
+	test_msg("running qgroup add/remove tests");
 	ret = btrfs_create_qgroup(&trans, BTRFS_FS_TREE_OBJECTID);
 	if (ret) {
 		test_err("couldn't create a qgroup %d", ret);
@@ -316,7 +316,7 @@ static int test_multiple_refs(struct btrfs_root *root,
 
 	btrfs_init_dummy_trans(&trans, fs_info);
 
-	test_msg("qgroup multiple refs test");
+	test_msg("running qgroup multiple refs test");
 
 	/*
 	 * We have BTRFS_FS_TREE_OBJECTID created already from the