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Commit 0e30db86 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

Btrfs: add a sanity test for a vacant extent at the front of a file 



Btrfs_get_extent was not handling this case properly, add a test to make sure we
don't regress.  Thanks,

Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
parent 25a50341

fs/btrfs/tests/inode-tests.c

+128 −5
Original line number Diff line number Diff line
@@ -86,6 +86,26 @@ static void insert_extent(struct btrfs_root *root, u64 start, u64 len, 
	btrfs_set_file_extent_other_encoding(leaf, fi, 0);

}



static void insert_inode_item_key(struct btrfs_root *root)

{

	struct btrfs_path path;

	struct extent_buffer *leaf = root->node;

	struct btrfs_key key;

	u32 value_len = 0;



	memset(&path, 0, sizeof(path));



	path.nodes[0] = leaf;

	path.slots[0] = 0;



	key.objectid = BTRFS_INODE_ITEM_KEY;

	key.type = BTRFS_INODE_ITEM_KEY;

	key.offset = 0;



	setup_items_for_insert(root, &path, &key, &value_len, value_len,

			       value_len + sizeof(struct btrfs_item), 1);

}



/*

 * Build the most complicated map of extents the earth has ever seen.  We want

 * this so we can test all of the corner cases of btrfs_get_extent.  Here is a
@@ -236,10 +256,6 @@ static noinline int test_btrfs_get_extent(void) 
	u64 offset;

	int ret = -ENOMEM;



	set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);

	set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);

	set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);



	inode = btrfs_new_test_inode();

	if (!inode) {

		test_msg("Couldn't allocate inode\n");
@@ -825,8 +841,115 @@ static noinline int test_btrfs_get_extent(void) 
	return ret;

}



static int test_hole_first(void)

{

	struct inode *inode = NULL;

	struct btrfs_root *root = NULL;

	struct extent_map *em = NULL;

	int ret = -ENOMEM;



	inode = btrfs_new_test_inode();

	if (!inode) {

		test_msg("Couldn't allocate inode\n");

		return ret;

	}



	BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;

	BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;

	BTRFS_I(inode)->location.offset = 0;



	root = btrfs_alloc_dummy_root();

	if (IS_ERR(root)) {

		test_msg("Couldn't allocate root\n");

		goto out;

	}



	root->fs_info = alloc_dummy_fs_info();

	if (!root->fs_info) {

		test_msg("Couldn't allocate dummy fs info\n");

		goto out;

	}



	root->node = alloc_dummy_extent_buffer(0, 4096);

	if (!root->node) {

		test_msg("Couldn't allocate dummy buffer\n");

		goto out;

	}



	extent_buffer_get(root->node);

	btrfs_set_header_nritems(root->node, 0);

	btrfs_set_header_level(root->node, 0);

	BTRFS_I(inode)->root = root;

	ret = -EINVAL;



	/*

	 * Need a blank inode item here just so we don't confuse

	 * btrfs_get_extent.

	 */

	insert_inode_item_key(root);

	insert_extent(root, 4096, 4096, 4096, 0, 4096, 4096,

		      BTRFS_FILE_EXTENT_REG, 0, 1);

	em = btrfs_get_extent(inode, NULL, 0, 0, 8192, 0);

	if (IS_ERR(em)) {

		test_msg("Got an error when we shouldn't have\n");

		goto out;

	}

	if (em->block_start != EXTENT_MAP_HOLE) {

		test_msg("Expected a hole, got %llu\n", em->block_start);

		goto out;

	}

	if (em->start != 0 || em->len != 4096) {

		test_msg("Unexpected extent wanted start 0 len 4096, got start "

			 "%llu len %llu\n", em->start, em->len);

		goto out;

	}

	if (em->flags != vacancy_only) {

		test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,

			 em->flags);

		goto out;

	}

	free_extent_map(em);



	em = btrfs_get_extent(inode, NULL, 0, 4096, 8192, 0);

	if (IS_ERR(em)) {

		test_msg("Got an error when we shouldn't have\n");

		goto out;

	}

	if (em->block_start != 4096) {

		test_msg("Expected a real extent, got %llu\n", em->block_start);

		goto out;

	}

	if (em->start != 4096 || em->len != 4096) {

		test_msg("Unexpected extent wanted start 4096 len 4096, got "

			 "start %llu len %llu\n", em->start, em->len);

		goto out;

	}

	if (em->flags != 0) {

		test_msg("Unexpected flags set, wanted 0 got %lu\n",

			 em->flags);

		goto out;

	}

	ret = 0;

out:

	if (!IS_ERR(em))

		free_extent_map(em);

	iput(inode);

	free_dummy_root(root);

	return ret;

}



int btrfs_test_inodes(void)

{

	int ret;



	set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);

	set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);

	set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);



	test_msg("Running btrfs_get_extent tests\n");

	return test_btrfs_get_extent();

	ret = test_btrfs_get_extent();

	if (ret)

		return ret;

	test_msg("Running hole first btrfs_get_extent test\n");

	return test_hole_first();

}