1 files changed, 571 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 000000000000..d05fe1ab4808
--- /dev/null
+++ b/fs/btrfs/tests/free-space-tree-tests.c
@@ -0,0 +1,571 @@
+/*
+ * Copyright (C) 2015 Facebook.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include "btrfs-tests.h"
+#include "../ctree.h"
+#include "../disk-io.h"
+#include "../free-space-tree.h"
+#include "../transaction.h"
+
+struct free_space_extent {
+	u64 start, length;
+};
+
+/*
+ * The test cases align their operations to this in order to hit some of the
+ * edge cases in the bitmap code.
+ */
+#define BITMAP_RANGE (BTRFS_FREE_SPACE_BITMAP_BITS * 4096)
+
+static int __check_free_space_extents(struct btrfs_trans_handle *trans,
+				      struct btrfs_fs_info *fs_info,
+				      struct btrfs_block_group_cache *cache,
+				      struct btrfs_path *path,
+				      struct free_space_extent *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, fs_info, cache, path, 0);
+	if (IS_ERR(info)) {
+		test_msg("Could not find free space info\n");
+		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_msg("Extent count is wrong\n");
+		ret = -EINVAL;
+		goto out;
+	}
+	if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
+		if (path->slots[0] != 0)
+			goto invalid;
+		end = cache->key.objectid + cache->key.offset;
+		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)
+						goto invalid;
+					if (i >= num_extents ||
+					    extent_start != extents[i].start ||
+					    offset - extent_start != extents[i].length)
+						goto invalid;
+					i++;
+				}
+				prev_bit = bit;
+				offset += cache->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_msg("Free space tree is invalid\n");
+	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 *cache,
+				    struct btrfs_path *path,
+				    struct free_space_extent *extents,
+				    unsigned int num_extents)
+{
+	struct btrfs_free_space_info *info;
+	u32 flags;
+	int ret;
+
+	info = search_free_space_info(trans, fs_info, cache, path, 0);
+	if (IS_ERR(info)) {
+		test_msg("Could not find free space info\n");
+		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, fs_info, cache, path);
+		if (ret) {
+			test_msg("Could not convert to extents\n");
+			return ret;
+		}
+	} else {
+		ret = convert_free_space_to_bitmaps(trans, fs_info, cache, path);
+		if (ret) {
+			test_msg("Could not convert to bitmaps\n");
+			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 *cache,
+				  struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, cache->key.offset},
+	};
+
+	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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid,
+					    cache->key.offset);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		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 *cache,
+				 struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid + BITMAP_RANGE,
+			cache->key.offset - BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid, BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, cache->key.offset - BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid +
+					    cache->key.offset - BITMAP_RANGE,
+					    BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		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 *cache,
+			      struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, BITMAP_RANGE},
+		{cache->key.objectid + 2 * BITMAP_RANGE,
+			cache->key.offset - 2 * BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid + BITMAP_RANGE,
+					    BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, 2 * BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid,
+					    cache->key.offset);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid, BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid + BITMAP_RANGE, 2 * BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid,
+					    cache->key.offset);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + 2 * BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, 3 * BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid,
+					    cache->key.offset);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid, BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + 2 * BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		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 *cache,
+			   struct btrfs_path *path)
+{
+	struct free_space_extent extents[] = {
+		{cache->key.objectid, BITMAP_RANGE},
+		{cache->key.objectid + 2 * BITMAP_RANGE, BITMAP_RANGE},
+		{cache->key.objectid + 4 * BITMAP_RANGE, BITMAP_RANGE},
+	};
+	int ret;
+
+	ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
+					    cache->key.objectid,
+					    cache->key.offset);
+	if (ret) {
+		test_msg("Could not remove free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid, BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + 4 * BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		return ret;
+	}
+
+	ret = __add_to_free_space_tree(trans, fs_info, cache, path,
+				       cache->key.objectid + 2 * BITMAP_RANGE,
+				       BITMAP_RANGE);
+	if (ret) {
+		test_msg("Could not add free space\n");
+		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_cache *,
+			   struct btrfs_path *);
+
+static int run_test(test_func_t test_func, int bitmaps)
+{
+	struct btrfs_root *root = NULL;
+	struct btrfs_block_group_cache *cache = NULL;
+	struct btrfs_trans_handle trans;
+	struct btrfs_path *path = NULL;
+	int ret;
+
+	root = btrfs_alloc_dummy_root();
+	if (IS_ERR(root)) {
+		test_msg("Couldn't allocate dummy root\n");
+		ret = PTR_ERR(root);
+		goto out;
+	}
+
+	root->fs_info = btrfs_alloc_dummy_fs_info();
+	if (!root->fs_info) {
+		test_msg("Couldn't allocate dummy fs info\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	btrfs_set_super_compat_ro_flags(root->fs_info->super_copy,
+					BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE);
+	root->fs_info->free_space_root = root;
+	root->fs_info->tree_root = root;
+
+	root->node = alloc_test_extent_buffer(root->fs_info, 4096);
+	if (!root->node) {
+		test_msg("Couldn't allocate dummy buffer\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	btrfs_set_header_level(root->node, 0);
+	btrfs_set_header_nritems(root->node, 0);
+	root->alloc_bytenr += 8192;
+
+	cache = btrfs_alloc_dummy_block_group(8 * BITMAP_RANGE);
+	if (!cache) {
+		test_msg("Couldn't allocate dummy block group cache\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	cache->bitmap_low_thresh = 0;
+	cache->bitmap_high_thresh = (u32)-1;
+	cache->needs_free_space = 1;
+
+	btrfs_init_dummy_trans(&trans);
+
+	path = btrfs_alloc_path();
+	if (!path) {
+		test_msg("Couldn't allocate path\n");
+		return -ENOMEM;
+	}
+
+	ret = add_block_group_free_space(&trans, root->fs_info, cache);
+	if (ret) {
+		test_msg("Could not add block group free space\n");
+		goto out;
+	}
+
+	if (bitmaps) {
+		ret = convert_free_space_to_bitmaps(&trans, root->fs_info,
+						    cache, path);
+		if (ret) {
+			test_msg("Could not convert block group to bitmaps\n");
+			goto out;
+		}
+	}
+
+	ret = test_func(&trans, root->fs_info, cache, path);
+	if (ret)
+		goto out;
+
+	ret = remove_block_group_free_space(&trans, root->fs_info, cache);
+	if (ret) {
+		test_msg("Could not remove block group free space\n");
+		goto out;
+	}
+
+	if (btrfs_header_nritems(root->node) != 0) {
+		test_msg("Free space tree has leftover items\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = 0;
+out:
+	btrfs_free_path(path);
+	btrfs_free_dummy_block_group(cache);
+	btrfs_free_dummy_root(root);
+	return ret;
+}
+
+static int run_test_both_formats(test_func_t test_func)
+{
+	int ret;
+
+	ret = run_test(test_func, 0);
+	if (ret)
+		return ret;
+	return run_test(test_func, 1);
+}
+
+int btrfs_test_free_space_tree(void)
+{
+	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,
+	};
+	int i;
+
+	test_msg("Running free space tree tests\n");
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		int ret = run_test_both_formats(tests[i]);
+		if (ret) {
+			test_msg("%pf failed\n", tests[i]);
+			return ret;
+		}
+	}
+
+	return 0;
+}