/*
* Copyright (C) 2013 Fusion IO. 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 <linux/slab.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../free-space-cache.h"
#define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8)
static struct btrfs_block_group_cache *init_test_block_group(void)
{
struct btrfs_block_group_cache *cache;
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache)
return NULL;
cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
GFP_NOFS);
if (!cache->free_space_ctl) {
kfree(cache);
return NULL;
}
cache->key.objectid = 0;
cache->key.offset = 1024 * 1024 * 1024;
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
cache->sectorsize = 4096;
spin_lock_init(&cache->lock);
INIT_LIST_HEAD(&cache->list);
INIT_LIST_HEAD(&cache->cluster_list);
INIT_LIST_HEAD(&cache->new_bg_list);
btrfs_init_free_space_ctl(cache);
return cache;
}
/*
* This test just does basic sanity checking, making sure we can add an exten
* entry and remove space from either end and the middle, and make sure we can
* remove space that covers adjacent extent entries.
*/
static int test_extents(struct btrfs_block_group_cache *cache)
{
int ret = 0;
test_msg("Running extent only tests\n");
/* First just make sure we can remove an entire entry */
ret = btrfs_add_free_space(cache, 0, 4 * 1024 * 1024);
if (ret) {
test_msg("Error adding initial extents %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 0, 4 * 1024 * 1024);
if (ret) {
test_msg("Error removing extent %d\n", ret);
return ret;
}
if (test_check_exists(cache, 0, 4 * 1024 * 1024)) {
test_msg("Full remove left some lingering space\n");
return -1;
}
/* Ok edge and middle cases now */
ret = btrfs_add_free_space(cache, 0, 4 * 1024 * 1024);
if (ret) {
test_msg("Error adding half extent %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 3 * 1024 * 1024, 1 * 1024 * 1024);
if (ret) {
test_msg("Error removing tail end %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 0, 1 * 1024 * 1024);
if (ret) {
test_msg("Error removing front end %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 2 * 1024 * 1024, 4096);
if (ret) {
test_msg("Error removing middle piece %d\n", ret);
return ret;
}
if (test_check_exists(cache, 0, 1 * 1024 * 1024)) {
test_msg("Still have space at the front\n");
return -1;
}
if (test_check_exists(cache, 2 * 1024 * 1024, 4096)) {
test_msg("Still have space in the middle\n");
return -1;
}
if (test_check_exists(cache, 3 * 1024 * 1024, 1 * 1024 * 1024)) {
test_msg("Still have space at the end\n");
return -1;
}
/* Cleanup */
__btrfs_remove_free_space_cache(cache->free_space_ctl);
return 0;
}
static int test_bitmaps(struct btrfs_block_group_cache *cache)
{
u64 next_bitmap_offset;
int ret;
test_msg("Running bitmap only tests\n");
ret = test_add_free_space_entry(cache, 0, 4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't create a bitmap entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 0, 4 * 1024 * 1024);
if (ret) {
test_msg("Error removing bitmap full range %d\n", ret);
return ret;
}
if (test_check_exists(cache, 0, 4 * 1024 * 1024)) {
test_msg("Left some space in bitmap\n");
return -1;
}
ret = test_add_free_space_entry(cache, 0, 4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add to our bitmap entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 1 * 1024 * 1024, 2 * 1024 * 1024);
if (ret) {
test_msg("Couldn't remove middle chunk %d\n", ret);
return ret;
}
/*
* The first bitmap we have starts at offset 0 so the next one is just
* at the end of the first bitmap.
*/
next_bitmap_offset = (u64)(BITS_PER_BITMAP * 4096);
/* Test a bit straddling two bitmaps */
ret = test_add_free_space_entry(cache, next_bitmap_offset -
(2 * 1024 * 1024), 4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add space that straddles two bitmaps %d\n",
ret);
return ret;
}
ret = btrfs_remove_free_space(cache, next_bitmap_offset -
(1 * 1024 * 1024), 2 * 1024 * 1024);
if (ret) {
test_msg("Couldn't remove overlapping space %d\n", ret);
return ret;
}
if (test_check_exists(cache, next_bitmap_offset - (1 * 1024 * 1024),
2 * 1024 * 1024)) {
test_msg("Left some space when removing overlapping\n");
return -1;
}
__btrfs_remove_free_space_cache(cache->free_space_ctl);
return 0;
}
/* This is the high grade jackassery */
static int test_bitmaps_and_extents(struct btrfs_block_group_cache *cache)
{
u64 bitmap_offset = (u64)(BITS_PER_BITMAP * 4096);
int ret;
test_msg("Running bitmap and extent tests\n");
/*
* First let's do something simple, an extent at the same offset as the
* bitmap, but the free space completely in the extent and then
* completely in the bitmap.
*/
ret = test_add_free_space_entry(cache, 4 * 1024 * 1024, 1 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't create bitmap entry %d\n", ret);
return ret;
}
ret = test_add_free_space_entry(cache, 0, 1 * 1024 * 1024, 0);
if (ret) {
test_msg("Couldn't add extent entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 0, 1 * 1024 * 1024);
if (ret) {
test_msg("Couldn't remove extent entry %d\n", ret);
return ret;
}
if (test_check_exists(cache, 0, 1 * 1024 * 1024)) {
test_msg("Left remnants after our remove\n");
return -1;
}
/* Now to add back the extent entry and remove from the bitmap */
ret = test_add_free_space_entry(cache, 0, 1 * 1024 * 1024, 0);
if (ret) {
test_msg("Couldn't re-add extent entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 4 * 1024 * 1024, 1 * 1024 * 1024);
if (ret) {
test_msg("Couldn't remove from bitmap %d\n", ret);
return ret;
}
if (test_check_exists(cache, 4 * 1024 * 1024, 1 * 1024 * 1024)) {
test_msg("Left remnants in the bitmap\n");
return -1;
}
/*
* Ok so a little more evil, extent entry and bitmap at the same offset,
* removing an overlapping chunk.
*/
ret = test_add_free_space_entry(cache, 1 * 1024 * 1024, 4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add to a bitmap %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 512 * 1024, 3 * 1024 * 1024);
if (ret) {
test_msg("Couldn't remove overlapping space %d\n", ret);
return ret;
}
if (test_check_exists(cache, 512 * 1024, 3 * 1024 * 1024)) {
test_msg("Left over peices after removing overlapping\n");
return -1;
}
__btrfs_remove_free_space_cache(cache->free_space_ctl);
/* Now with the extent entry offset into the bitmap */
ret = test_add_free_space_entry(cache, 4 * 1024 * 1024, 4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add space to the bitmap %d\n", ret);
return ret;
}
ret = test_add_free_space_entry(cache, 2 * 1024 * 1024, 2 * 1024 * 1024, 0);
if (ret) {
test_msg("Couldn't add extent to the cache %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 3 * 1024 * 1024, 4 * 1024 * 1024);
if (ret) {
test_msg("Problem removing overlapping space %d\n", ret);
return ret;
}
if (test_check_exists(cache, 3 * 1024 * 1024, 4 * 1024 * 1024)) {
test_msg("Left something behind when removing space");
return -1;
}
/*
* This has blown up in the past, the extent entry starts before the
* bitmap entry, but we're trying to remove an offset that falls
* completely within the bitmap range and is in both the extent entry
* and the bitmap entry, looks like this
*
* [ extent ]
* [ bitmap ]
* [ del ]
*/
__btrfs_remove_free_space_cache(cache->free_space_ctl);
ret = test_add_free_space_entry(cache, bitmap_offset + 4 * 1024 * 1024,
4 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add bitmap %d\n", ret);
return ret;
}
ret = test_add_free_space_entry(cache, bitmap_offset - 1 * 1024 * 1024,
5 * 1024 * 1024, 0);
if (ret) {
test_msg("Couldn't add extent entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, bitmap_offset + 1 * 1024 * 1024,
5 * 1024 * 1024);
if (ret) {
test_msg("Failed to free our space %d\n", ret);
return ret;
}
if (test_check_exists(cache, bitmap_offset + 1 * 1024 * 1024,
5 * 1024 * 1024)) {
test_msg("Left stuff over\n");
return -1;
}
__btrfs_remove_free_space_cache(cache->free_space_ctl);
/*
* This blew up before, we have part of the free space in a bitmap and
* then the entirety of the rest of the space in an extent. This used
* to return -EAGAIN back from btrfs_remove_extent, make sure this
* doesn't happen.
*/
ret = test_add_free_space_entry(cache, 1 * 1024 * 1024, 2 * 1024 * 1024, 1);
if (ret) {
test_msg("Couldn't add bitmap entry %d\n", ret);
return ret;
}
ret = test_add_free_space_entry(cache, 3 * 1024 * 1024, 1 * 1024 * 1024, 0);
if (ret) {
test_msg("Couldn't add extent entry %d\n", ret);
return ret;
}
ret = btrfs_remove_free_space(cache, 1 * 1024 * 1024, 3 * 1024 * 1024);
if (ret) {
test_msg("Error removing bitmap and extent overlapping %d\n", ret);
return ret;
}
__btrfs_remove_free_space_cache(cache->free_space_ctl);
return 0;
}
int btrfs_test_free_space_cache(void)
{
struct btrfs_block_group_cache *cache;
int ret;
test_msg("Running btrfs free space cache tests\n");
cache = init_test_block_group();
if (!cache) {
test_msg("Couldn't run the tests\n");
return 0;
}
ret = test_extents(cache);
if (ret)
goto out;
ret = test_bitmaps(cache);
if (ret)
goto out;
ret = test_bitmaps_and_extents(cache);
if (ret)
goto out;
out:
__btrfs_remove_free_space_cache(cache->free_space_ctl);
kfree(cache->free_space_ctl);
kfree(cache);
test_msg("Free space cache tests finished\n");
return ret;
}
