#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"
#include "../accessors.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 = btrfs_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 = btrfs_block_group_end(cache);
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 = btrfs_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 = btrfs_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;
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
ret = btrfs_convert_free_space_to_extents(trans, cache, path);
if (ret) {
test_err("could not convert to extents");
return ret;
}
} else {
ret = btrfs_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 = __btrfs_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 = __btrfs_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 = __btrfs_remove_from_free_space_tree(trans, cache, path,
btrfs_block_group_end(cache) - 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 = __btrfs_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 = __btrfs_remove_from_free_space_tree(trans, cache, path,
cache->start, cache->length);
if (ret) {
test_err("could not remove free space");
return ret;
}
ret = __btrfs_add_to_free_space_tree(trans, cache, path, cache->start,
alignment);
if (ret) {
test_err("could not add free space");
return ret;
}
ret = __btrfs_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 = __btrfs_remove_from_free_space_tree(trans, cache, path,
cache->start, cache->length);
if (ret) {
test_err("could not remove free space");
return ret;
}
ret = __btrfs_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 = __btrfs_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 = __btrfs_remove_from_free_space_tree(trans, cache, path,
cache->start, cache->length);
if (ret) {
test_err("could not remove free space");
return ret;
}
ret = __btrfs_add_to_free_space_tree(trans, cache, path, cache->start,
alignment);
if (ret) {
test_err("could not add free space");
return ret;
}
ret = __btrfs_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 = __btrfs_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 = __btrfs_remove_from_free_space_tree(trans, cache, path,
cache->start, cache->length);
if (ret) {
test_err("could not remove free space");
return ret;
}
ret = __btrfs_add_to_free_space_tree(trans, cache, path, cache->start,
alignment);
if (ret) {
test_err("could not add free space");
return ret;
}
ret = __btrfs_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 = __btrfs_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 = btrfs_add_block_group_free_space(&trans, cache);
if (ret) {
test_err("could not add block group free space");
goto out;
}
if (bitmaps) {
ret = btrfs_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 = btrfs_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;
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;
}
