1 files changed, 588 insertions, 0 deletions

diff --git a/fs/btrfs/tests/free-space-tree-tests.c b/fs/btrfs/tests/free-space-tree-tests.c
new file mode 100644
index 000000000..766117a76
--- /dev/null
+++ b/fs/btrfs/tests/free-space-tree-tests.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2015 Facebook.  All rights reserved.
+ */
+
+#include <linux/types.h>
+#include "btrfs-tests.h"
+#include "../ctree.h"
+#include "../disk-io.h"
+#include "../free-space-tree.h"
+#include "../transaction.h"
+#include "../block-group.h"
+
+struct free_space_extent {
+	u64 start;
+	u64 length;
+};
+
+static int __check_free_space_extents(struct btrfs_trans_handle *trans,
+				      struct btrfs_fs_info *fs_info,
+				      struct btrfs_block_group *cache,
+				      struct btrfs_path *path,
+				      const struct free_space_extent * const extents,
+				      unsigned int num_extents)
+{
+	struct btrfs_free_space_info *info;
+	struct btrfs_key key;
+	int prev_bit = 0, bit;
+	u64 extent_start = 0, offset, end;
+	u32 flags, extent_count;
+	unsigned int i;
+	int ret;
+
+	info = search_free_space_info(trans, cache, path, 0);
+	if (IS_ERR(info)) {
+		test_err("could not find free space info");
+		ret = PTR_ERR(info);
+		goto out;
+	}
+	flags = btrfs_free_space_flags(path->nodes[0], info);
+	extent_count = btrfs_free_space_extent_count(path->nodes[0], info);
+
+	if (extent_count != num_extents) {
+		test_err("extent count is wrong");
+		ret = -EINVAL;
+		goto out;
+	}
+	if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
+		if (path->slots[0] != 0)
+			goto invalid;
+		end = cache->start + cache->length;
+		i = 0;
+		while (++path->slots[0] < btrfs_header_nritems(path->nodes[0])) {
+			btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+			if (key.type != BTRFS_FREE_SPACE_BITMAP_KEY)
+				goto invalid;
+			offset = key.objectid;
+			while (offset < key.objectid + key.offset) {
+				bit = free_space_test_bit(cache, path, offset);
+				if (prev_bit == 0 && bit == 1) {
+					extent_start = offset;
+				} else if (prev_bit == 1 && bit == 0) {
+					if (i >= num_extents ||
+					    extent_start != extents[i].start ||
+					    offset - extent_start != extents[i].length)
+						goto invalid;
+					i++;
+				}
+				prev_bit = bit;
+				offset += fs_info->sectorsize;
+			}
+		}
+		if (prev_bit == 1) {
+			if (i >= num_extents ||
+			    extent_start != extents[i].start ||
+			    end - extent_start != extents[i].length)
+				goto invalid;
+			i++;
+		}
+		if (i != num_extents)
+			goto invalid;
+	} else {
+		if (btrfs_header_nritems(path->nodes[0]) != num_extents + 1 ||
+		    path->slots[0] != 0)
+			goto invalid;
+		for (i = 0; i < num_extents; i++) {
+			path->slots[0]++;
+			btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+			if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY ||
+			    key.objectid != extents[i].start ||
+			    key.offset != extents[i].length)
+				goto invalid;
+		}
+	}
+
+	ret = 0;
+out:
+	btrfs_release_path(path);
+	return ret;
+invalid:
+	test_err("free space tree is invalid");
+	ret = -EINVAL;
+	goto out;
+}
+
+static int check_free_space_extents(struct btrfs_trans_handle *trans,
+				    struct btrfs_fs_info *fs_info,
+				    struct btrfs_block_group *cache,
+				    struct btrfs_path *path,
+				    const struct free_space_extent * const extents,
+				    unsigned int num_extents)
+{
+	struct btrfs_free_space_info *info;
+	u32 flags;
+	int ret;
+
+	info = search_free_space_info(trans, cache, path, 0);
+	if (IS_ERR(info)) {
+		test_err("could not find free space info");
+		btrfs_release_path(path);
+		return PTR_ERR(info);
+	}
+	flags = btrfs_free_space_flags(path->nodes[0], info);
+	btrfs_release_path(path);
+
+	ret = __check_free_space_extents(trans, fs_info, cache, path, extents,
+					 num_extents);
+	if (ret)
+		return ret;
+
+	/* Flip it to the other format and check that for good measure. */
+	if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
+		ret = convert_free_space_to_extents(trans, cache, path);
+		if (ret) {
+			test_err("could not convert to extents");
+			return ret;
+		}
+	} else {
+		ret = convert_free_space_to_bitmaps(trans, cache, path);
+		if (ret) {
+			test_err("could not convert to bitmaps");
+			return ret;
+		}
+	}
+	return __check_free_space_extents(trans, fs_info, cache, path, extents,
+					  num_extents);
+}
+
+static int test_empty_block_group(struct btrfs_trans_handle *trans,
+				  struct btrfs_fs_info *fs_info,
+				  struct btrfs_block_group *cache,
+				  struct btrfs_path *path,
+				  u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, cache->length},
+	};
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_remove_all(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start,
+					    cache->length);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_remove_beginning(struct btrfs_trans_handle *trans,
+				 struct btrfs_fs_info *fs_info,
+				 struct btrfs_block_group *cache,
+				 struct btrfs_path *path,
+				 u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start + alignment, cache->length - alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start, alignment);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+
+}
+
+static int test_remove_end(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, cache->length - alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+				    cache->start + cache->length - alignment,
+				    alignment);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_remove_middle(struct btrfs_trans_handle *trans,
+			      struct btrfs_fs_info *fs_info,
+			      struct btrfs_block_group *cache,
+			      struct btrfs_path *path,
+			      u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, alignment},
+		{cache->start + 2 * alignment, cache->length - 2 * alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start + alignment,
+					    alignment);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_merge_left(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, 2 * alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start, cache->length);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path, cache->start,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + alignment,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_merge_right(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start + alignment, 2 * alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start, cache->length);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + 2 * alignment,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + alignment,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_merge_both(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, 3 * alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start, cache->length);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path, cache->start,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + 2 * alignment, alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + alignment, alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+static int test_merge_none(struct btrfs_trans_handle *trans,
+			   struct btrfs_fs_info *fs_info,
+			   struct btrfs_block_group *cache,
+			   struct btrfs_path *path,
+			   u32 alignment)
+{
+	const struct free_space_extent extents[] = {
+		{cache->start, alignment},
+		{cache->start + 2 * alignment, alignment},
+		{cache->start + 4 * alignment, alignment},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, cache, path,
+					    cache->start, cache->length);
+	if (ret) {
+		test_err("could not remove free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path, cache->start,
+				       alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + 4 * alignment, alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, cache, path,
+				       cache->start + 2 * alignment, alignment);
+	if (ret) {
+		test_err("could not add free space");
+		return ret;
+	}
+
+	return check_free_space_extents(trans, fs_info, cache, path,
+					extents, ARRAY_SIZE(extents));
+}
+
+typedef int (*test_func_t)(struct btrfs_trans_handle *,
+			   struct btrfs_fs_info *,
+			   struct btrfs_block_group *,
+			   struct btrfs_path *,
+			   u32 alignment);
+
+static int run_test(test_func_t test_func, int bitmaps, u32 sectorsize,
+		    u32 nodesize, u32 alignment)
+{
+	struct btrfs_fs_info *fs_info;
+	struct btrfs_root *root = NULL;
+	struct btrfs_block_group *cache = NULL;
+	struct btrfs_trans_handle trans;
+	struct btrfs_path *path = NULL;
+	int ret;
+
+	fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+	if (!fs_info) {
+		test_std_err(TEST_ALLOC_FS_INFO);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	root = btrfs_alloc_dummy_root(fs_info);
+	if (IS_ERR(root)) {
+		test_std_err(TEST_ALLOC_ROOT);
+		ret = PTR_ERR(root);
+		goto out;
+	}
+
+	btrfs_set_super_compat_ro_flags(root->fs_info->super_copy,
+					BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE);
+	root->root_key.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
+	root->root_key.type = BTRFS_ROOT_ITEM_KEY;
+	root->root_key.offset = 0;
+	btrfs_global_root_insert(root);
+	root->fs_info->tree_root = root;
+
+	root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
+	if (IS_ERR(root->node)) {
+		test_std_err(TEST_ALLOC_EXTENT_BUFFER);
+		ret = PTR_ERR(root->node);
+		goto out;
+	}
+	btrfs_set_header_level(root->node, 0);
+	btrfs_set_header_nritems(root->node, 0);
+	root->alloc_bytenr += 2 * nodesize;
+
+	cache = btrfs_alloc_dummy_block_group(fs_info, 8 * alignment);
+	if (!cache) {
+		test_std_err(TEST_ALLOC_BLOCK_GROUP);
+		ret = -ENOMEM;
+		goto out;
+	}
+	cache->bitmap_low_thresh = 0;
+	cache->bitmap_high_thresh = (u32)-1;
+	set_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &cache->runtime_flags);
+	cache->fs_info = root->fs_info;
+
+	btrfs_init_dummy_trans(&trans, root->fs_info);
+
+	path = btrfs_alloc_path();
+	if (!path) {
+		test_std_err(TEST_ALLOC_ROOT);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = add_block_group_free_space(&trans, cache);
+	if (ret) {
+		test_err("could not add block group free space");
+		goto out;
+	}
+
+	if (bitmaps) {
+		ret = convert_free_space_to_bitmaps(&trans, cache, path);
+		if (ret) {
+			test_err("could not convert block group to bitmaps");
+			goto out;
+		}
+	}
+
+	ret = test_func(&trans, root->fs_info, cache, path, alignment);
+	if (ret)
+		goto out;
+
+	ret = remove_block_group_free_space(&trans, cache);
+	if (ret) {
+		test_err("could not remove block group free space");
+		goto out;
+	}
+
+	if (btrfs_header_nritems(root->node) != 0) {
+		test_err("free space tree has leftover items");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = 0;
+out:
+	btrfs_free_path(path);
+	btrfs_free_dummy_block_group(cache);
+	btrfs_free_dummy_root(root);
+	btrfs_free_dummy_fs_info(fs_info);
+	return ret;
+}
+
+static int run_test_both_formats(test_func_t test_func, u32 sectorsize,
+				 u32 nodesize, u32 alignment)
+{
+	int test_ret = 0;
+	int ret;
+
+	ret = run_test(test_func, 0, sectorsize, nodesize, alignment);
+	if (ret) {
+		test_err(
+	"%ps failed with extents, sectorsize=%u, nodesize=%u, alignment=%u",
+			 test_func, sectorsize, nodesize, alignment);
+		test_ret = ret;
+	}
+
+	ret = run_test(test_func, 1, sectorsize, nodesize, alignment);
+	if (ret) {
+		test_err(
+	"%ps failed with bitmaps, sectorsize=%u, nodesize=%u, alignment=%u",
+			 test_func, sectorsize, nodesize, alignment);
+		test_ret = ret;
+	}
+
+	return test_ret;
+}
+
+int btrfs_test_free_space_tree(u32 sectorsize, u32 nodesize)
+{
+	test_func_t tests[] = {
+		test_empty_block_group,
+		test_remove_all,
+		test_remove_beginning,
+		test_remove_end,
+		test_remove_middle,
+		test_merge_left,
+		test_merge_right,
+		test_merge_both,
+		test_merge_none,
+	};
+	u32 bitmap_alignment;
+	int test_ret = 0;
+	int i;
+
+	/*
+	 * Align some operations to a page to flush out bugs in the extent
+	 * buffer bitmap handling of highmem.
+	 */
+	bitmap_alignment = BTRFS_FREE_SPACE_BITMAP_BITS * PAGE_SIZE;
+
+	test_msg("running free space tree tests");
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		int ret;
+
+		ret = run_test_both_formats(tests[i], sectorsize, nodesize,
+					    sectorsize);
+		if (ret)
+			test_ret = ret;
+
+		ret = run_test_both_formats(tests[i], sectorsize, nodesize,
+					    bitmap_alignment);
+		if (ret)
+			test_ret = ret;
+	}
+
+	return test_ret;
+}