int btrfs_test_free_space_cache(void)
{
struct btrfs_block_group_cache *cache;
struct btrfs_root *root = NULL;
int ret = -ENOMEM;
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;
}
root = btrfs_alloc_dummy_root();
if (!root)
goto out;
root->fs_info = btrfs_alloc_dummy_fs_info();
if (!root->fs_info)
goto out;
root->fs_info->extent_root = root;
cache->fs_info = root->fs_info;
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;
ret = test_steal_space_from_bitmap_to_extent(cache);
out:
__btrfs_remove_free_space_cache(cache->free_space_ctl);
kfree(cache->free_space_ctl);
kfree(cache);
btrfs_free_dummy_root(root);
test_msg("Free space cache tests finished\n");
return ret;
}
int btrfs_test_qgroups(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info = NULL;
struct btrfs_root *root;
struct btrfs_root *tmp_root;
int ret = 0;
fs_info = btrfs_alloc_dummy_fs_info();
if (!fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
return -ENOMEM;
}
root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
ret = PTR_ERR(root);
goto out;
}
/* We are using this root as our extent root */
root->fs_info->extent_root = root;
/*
* Some of the paths we test assume we have a filled out fs_info, so we
* just need to add the root in there so we don't panic.
*/
root->fs_info->tree_root = root;
root->fs_info->quota_root = root;
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
/*
* Can't use bytenr 0, some things freak out
* *cough*backref walking code*cough*
*/
root->node = alloc_test_extent_buffer(root->fs_info, nodesize,
nodesize);
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 += 2 * nodesize;
tmp_root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(tmp_root)) {
test_msg("Couldn't allocate a fs root\n");
ret = PTR_ERR(tmp_root);
goto out;
}
tmp_root->root_key.objectid = BTRFS_FS_TREE_OBJECTID;
root->fs_info->fs_root = tmp_root;
ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
if (ret) {
test_msg("Couldn't insert fs root %d\n", ret);
goto out;
}
tmp_root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(tmp_root)) {
test_msg("Couldn't allocate a fs root\n");
ret = PTR_ERR(tmp_root);
goto out;
}
tmp_root->root_key.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
if (ret) {
test_msg("Couldn't insert fs root %d\n", ret);
goto out;
}
test_msg("Running qgroup tests\n");
ret = test_no_shared_qgroup(root, sectorsize, nodesize);
if (ret)
goto out;
ret = test_multiple_refs(root, sectorsize, nodesize);
out:
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
static int test_extent_accounting(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info = NULL;
struct inode *inode = NULL;
struct btrfs_root *root = NULL;
int ret = -ENOMEM;
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Couldn't allocate inode\n");
return ret;
}
fs_info = btrfs_alloc_dummy_fs_info();
if (!fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
BTRFS_I(inode)->root = root;
btrfs_test_inode_set_ops(inode);
/* [BTRFS_MAX_EXTENT_SIZE] */
BTRFS_I(inode)->outstanding_extents++;
ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1,
NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 1) {
ret = -EINVAL;
test_msg("Miscount, wanted 1, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
BTRFS_I(inode)->outstanding_extents++;
ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,
BTRFS_MAX_EXTENT_SIZE + sectorsize - 1,
NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 2) {
ret = -EINVAL;
test_msg("Miscount, wanted 2, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
BTRFS_MAX_EXTENT_SIZE >> 1,
(BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
EXTENT_DELALLOC | EXTENT_DIRTY |
EXTENT_UPTODATE | EXTENT_DO_ACCOUNTING, 0, 0,
NULL, GFP_KERNEL);
if (ret) {
test_msg("clear_extent_bit returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 2) {
ret = -EINVAL;
test_msg("Miscount, wanted 2, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
BTRFS_I(inode)->outstanding_extents++;
ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,
(BTRFS_MAX_EXTENT_SIZE >> 1)
+ sectorsize - 1,
NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 2) {
ret = -EINVAL;
test_msg("Miscount, wanted 2, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/*
* [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize HOLE][BTRFS_MAX_EXTENT_SIZE+sectorsize]
*
* I'm artificially adding 2 to outstanding_extents because in the
* buffered IO case we'd add things up as we go, but I don't feel like
* doing that here, this isn't the interesting case we want to test.
*/
BTRFS_I(inode)->outstanding_extents += 2;
ret = btrfs_set_extent_delalloc(inode,
BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize,
(BTRFS_MAX_EXTENT_SIZE << 1) + 3 * sectorsize - 1,
NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 4) {
ret = -EINVAL;
test_msg("Miscount, wanted 4, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/*
* [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize][BTRFS_MAX_EXTENT_SIZE+sectorsize]
*/
BTRFS_I(inode)->outstanding_extents++;
ret = btrfs_set_extent_delalloc(inode,
BTRFS_MAX_EXTENT_SIZE + sectorsize,
BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 3) {
ret = -EINVAL;
test_msg("Miscount, wanted 3, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
BTRFS_MAX_EXTENT_SIZE + sectorsize,
BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
NULL, GFP_KERNEL);
if (ret) {
test_msg("clear_extent_bit returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 4) {
ret = -EINVAL;
test_msg("Miscount, wanted 4, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/*
* Refill the hole again just for good measure, because I thought it
* might fail and I'd rather satisfy my paranoia at this point.
*/
BTRFS_I(inode)->outstanding_extents++;
ret = btrfs_set_extent_delalloc(inode,
BTRFS_MAX_EXTENT_SIZE + sectorsize,
BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, NULL);
if (ret) {
test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents != 3) {
ret = -EINVAL;
test_msg("Miscount, wanted 3, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
/* Empty */
ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
NULL, GFP_KERNEL);
if (ret) {
test_msg("clear_extent_bit returned %d\n", ret);
goto out;
}
if (BTRFS_I(inode)->outstanding_extents) {
ret = -EINVAL;
test_msg("Miscount, wanted 0, got %u\n",
BTRFS_I(inode)->outstanding_extents);
goto out;
}
ret = 0;
out:
if (ret)
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,
NULL, GFP_KERNEL);
iput(inode);
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
static int test_hole_first(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info = NULL;
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;
fs_info = btrfs_alloc_dummy_fs_info();
if (!fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
root->node = alloc_dummy_extent_buffer(NULL, nodesize, nodesize);
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, sectorsize, sectorsize, sectorsize, 0, sectorsize,
sectorsize, BTRFS_FILE_EXTENT_REG, 0, 1);
em = btrfs_get_extent(inode, NULL, 0, 0, 2 * sectorsize, 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 != sectorsize) {
test_msg("Unexpected extent wanted start 0 len %u, "
"got start %llu len %llu\n",
sectorsize, 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, sectorsize, 2 * sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != sectorsize) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != sectorsize || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %u len %u, "
"got start %llu len %llu\n",
sectorsize, sectorsize, 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);
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info = NULL;
struct inode *inode = NULL;
struct btrfs_root *root = NULL;
struct extent_map *em = NULL;
u64 orig_start;
u64 disk_bytenr;
u64 offset;
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;
fs_info = btrfs_alloc_dummy_fs_info();
if (!fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
root->node = alloc_dummy_extent_buffer(NULL, nodesize, nodesize);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
goto out;
}
/*
* We will just free a dummy node if it's ref count is 2 so we need an
* extra ref so our searches don't accidentally release our page.
*/
extent_buffer_get(root->node);
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
ret = -EINVAL;
/* First with no extents */
BTRFS_I(inode)->root = root;
em = btrfs_get_extent(inode, NULL, 0, 0, sectorsize, 0);
if (IS_ERR(em)) {
em = NULL;
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 (!test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
test_msg("Vacancy flag wasn't set properly\n");
goto out;
}
free_extent_map(em);
btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
/*
* All of the magic numbers are based on the mapping setup in
* setup_file_extents, so if you change anything there you need to
* update the comment and update the expected values below.
*/
setup_file_extents(root, sectorsize);
em = btrfs_get_extent(inode, NULL, 0, 0, (u64)-1, 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 != 5) {
test_msg("Unexpected extent wanted start 0 len 5, got start "
"%llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_INLINE) {
test_msg("Expected an inline, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != (sectorsize - 5)) {
test_msg("Unexpected extent wanted start %llu len 1, got start "
"%llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
/*
* We don't test anything else for inline since it doesn't get set
* unless we have a page for it to write into. Maybe we should change
* this?
*/
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 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 != offset || em->len != 4) {
test_msg("Unexpected extent wanted start %llu len 4, got start "
"%llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Regular extent */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize - 1) {
test_msg("Unexpected extent wanted start %llu len 4095, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* The next 3 are split extents */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 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 != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 2 * sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, 2 * sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
orig_start, em->orig_start);
goto out;
}
disk_bytenr += (em->start - orig_start);
if (em->block_start != disk_bytenr) {
test_msg("Wrong block start, want %llu, have %llu\n",
disk_bytenr, em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Prealloc extent */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* The next 3 are a half written prealloc extent */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 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 real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Unexpected orig offset, wanted %llu, have %llu\n",
orig_start, em->orig_start);
goto out;
}
if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
test_msg("Unexpected block start, wanted %llu, have %llu\n",
disk_bytenr + (em->start - em->orig_start),
em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 2 * sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, 2 * sectorsize, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", orig_start,
em->orig_start);
goto out;
}
if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
test_msg("Unexpected block start, wanted %llu, have %llu\n",
disk_bytenr + (em->start - em->orig_start),
em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Now for the compressed extent */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 2 * sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u,"
"got start %llu len %llu\n",
offset, 2 * sectorsize, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, em->orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Split compressed extent */
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u,"
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, em->orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != disk_bytenr) {
test_msg("Block start does not match, want %llu got %llu\n",
disk_bytenr, em->block_start);
goto out;
}
if (em->start != offset || em->len != 2 * sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, 2 * sectorsize, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* A hole between regular extents but no hole extent */
em = btrfs_get_extent(inode, NULL, 0, offset + 6, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096 * 1024, 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 extent, got %llu\n", em->block_start);
goto out;
}
/*
* Currently we just return a length that we requested rather than the
* length of the actual hole, if this changes we'll have to change this
* test.
*/
if (em->start != offset || em->len != 3 * sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u, "
"got start %llu len %llu\n",
offset, 3 * sectorsize, em->start, em->len);
goto out;
}
if (em->flags != vacancy_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
vacancy_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, sectorsize, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != sectorsize) {
test_msg("Unexpected extent wanted start %llu len %u,"
"got start %llu len %llu\n",
offset, sectorsize, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
ret = 0;
out:
if (!IS_ERR(em))
free_extent_map(em);
iput(inode);
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
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;
}
/*
* Before we were able to steal free space from a bitmap entry to an extent
* entry, we could end up with 2 entries representing a contiguous free space.
* One would be an extent entry and the other a bitmap entry. Since in order
* to allocate space to a caller we use only 1 entry, we couldn't return that
* whole range to the caller if it was requested. This forced the caller to
* either assume ENOSPC or perform several smaller space allocations, which
* wasn't optimal as they could be spread all over the block group while under
* concurrency (extra overhead and fragmentation).
*
* This stealing approach is beneficial, since we always prefer to allocate
* from extent entries, both for clustered and non-clustered allocation
* requests.
*/
static int
test_steal_space_from_bitmap_to_extent(struct btrfs_block_group_cache *cache,
u32 sectorsize)
{
int ret;
u64 offset;
u64 max_extent_size;
const struct btrfs_free_space_op test_free_space_ops = {
.recalc_thresholds = cache->free_space_ctl->op->recalc_thresholds,
.use_bitmap = test_use_bitmap,
};
const struct btrfs_free_space_op *orig_free_space_ops;
test_msg("Running space stealing from bitmap to extent\n");
/*
* For this test, we want to ensure we end up with an extent entry
* immediately adjacent to a bitmap entry, where the bitmap starts
* at an offset where the extent entry ends. We keep adding and
* removing free space to reach into this state, but to get there
* we need to reach a point where marking new free space doesn't
* result in adding new extent entries or merging the new space
* with existing extent entries - the space ends up being marked
* in an existing bitmap that covers the new free space range.
*
* To get there, we need to reach the threshold defined set at
* cache->free_space_ctl->extents_thresh, which currently is
* 256 extents on a x86_64 system at least, and a few other
* conditions (check free_space_cache.c). Instead of making the
* test much longer and complicated, use a "use_bitmap" operation
* that forces use of bitmaps as soon as we have at least 1
* extent entry.
*/
orig_free_space_ops = cache->free_space_ctl->op;
cache->free_space_ctl->op = &test_free_space_ops;
/*
* Extent entry covering free space range [128Mb - 256Kb, 128Mb - 128Kb[
*/
ret = test_add_free_space_entry(cache, SZ_128M - SZ_256K, SZ_128K, 0);
if (ret) {
test_msg("Couldn't add extent entry %d\n", ret);
return ret;
}
/* Bitmap entry covering free space range [128Mb + 512Kb, 256Mb[ */
ret = test_add_free_space_entry(cache, SZ_128M + SZ_512K,
SZ_128M - SZ_512K, 1);
if (ret) {
test_msg("Couldn't add bitmap entry %d\n", ret);
return ret;
}
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* Now make only the first 256Kb of the bitmap marked as free, so that
* we end up with only the following ranges marked as free space:
*
* [128Mb - 256Kb, 128Mb - 128Kb[
* [128Mb + 512Kb, 128Mb + 768Kb[
*/
ret = btrfs_remove_free_space(cache,
SZ_128M + 768 * SZ_1K,
SZ_128M - 768 * SZ_1K);
if (ret) {
test_msg("Failed to free part of bitmap space %d\n", ret);
return ret;
}
/* Confirm that only those 2 ranges are marked as free. */
if (!test_check_exists(cache, SZ_128M - SZ_256K, SZ_128K)) {
test_msg("Free space range missing\n");
return -ENOENT;
}
if (!test_check_exists(cache, SZ_128M + SZ_512K, SZ_256K)) {
test_msg("Free space range missing\n");
return -ENOENT;
}
/*
* Confirm that the bitmap range [128Mb + 768Kb, 256Mb[ isn't marked
* as free anymore.
*/
if (test_check_exists(cache, SZ_128M + 768 * SZ_1K,
SZ_128M - 768 * SZ_1K)) {
test_msg("Bitmap region not removed from space cache\n");
return -EINVAL;
}
/*
* Confirm that the region [128Mb + 256Kb, 128Mb + 512Kb[, which is
* covered by the bitmap, isn't marked as free.
*/
if (test_check_exists(cache, SZ_128M + SZ_256K, SZ_256K)) {
test_msg("Invalid bitmap region marked as free\n");
return -EINVAL;
}
/*
* Confirm that the region [128Mb, 128Mb + 256Kb[, which is covered
* by the bitmap too, isn't marked as free either.
*/
if (test_check_exists(cache, SZ_128M, SZ_256K)) {
test_msg("Invalid bitmap region marked as free\n");
return -EINVAL;
}
/*
* Now lets mark the region [128Mb, 128Mb + 512Kb[ as free too. But,
* lets make sure the free space cache marks it as free in the bitmap,
* and doesn't insert a new extent entry to represent this region.
*/
ret = btrfs_add_free_space(cache, SZ_128M, SZ_512K);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/* Confirm the region is marked as free. */
if (!test_check_exists(cache, SZ_128M, SZ_512K)) {
test_msg("Bitmap region not marked as free\n");
return -ENOENT;
}
/*
* Confirm that no new extent entries or bitmap entries were added to
* the cache after adding that free space region.
*/
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* Now lets add a small free space region to the right of the previous
* one, which is not contiguous with it and is part of the bitmap too.
* The goal is to test that the bitmap entry space stealing doesn't
* steal this space region.
*/
ret = btrfs_add_free_space(cache, SZ_128M + SZ_16M, sectorsize);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/*
* Confirm that no new extent entries or bitmap entries were added to
* the cache after adding that free space region.
*/
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* Now mark the region [128Mb - 128Kb, 128Mb[ as free too. This will
* expand the range covered by the existing extent entry that represents
* the free space [128Mb - 256Kb, 128Mb - 128Kb[.
*/
ret = btrfs_add_free_space(cache, SZ_128M - SZ_128K, SZ_128K);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/* Confirm the region is marked as free. */
if (!test_check_exists(cache, SZ_128M - SZ_128K, SZ_128K)) {
test_msg("Extent region not marked as free\n");
return -ENOENT;
}
/*
* Confirm that our extent entry didn't stole all free space from the
* bitmap, because of the small 4Kb free space region.
*/
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* So now we have the range [128Mb - 256Kb, 128Mb + 768Kb[ as free
* space. Without stealing bitmap free space into extent entry space,
* we would have all this free space represented by 2 entries in the
* cache:
*
* extent entry covering range: [128Mb - 256Kb, 128Mb[
* bitmap entry covering range: [128Mb, 128Mb + 768Kb[
*
* Attempting to allocate the whole free space (1Mb) would fail, because
* we can't allocate from multiple entries.
* With the bitmap free space stealing, we get a single extent entry
* that represents the 1Mb free space, and therefore we're able to
* allocate the whole free space at once.
*/
if (!test_check_exists(cache, SZ_128M - SZ_256K, SZ_1M)) {
test_msg("Expected region not marked as free\n");
return -ENOENT;
}
if (cache->free_space_ctl->free_space != (SZ_1M + sectorsize)) {
test_msg("Cache free space is not 1Mb + %u\n", sectorsize);
return -EINVAL;
}
offset = btrfs_find_space_for_alloc(cache,
0, SZ_1M, 0,
&max_extent_size);
if (offset != (SZ_128M - SZ_256K)) {
test_msg("Failed to allocate 1Mb from space cache, returned offset is: %llu\n",
offset);
return -EINVAL;
}
/*
* All that remains is a sectorsize free space region in a bitmap.
* Confirm.
*/
ret = check_num_extents_and_bitmaps(cache, 1, 1);
if (ret)
return ret;
if (cache->free_space_ctl->free_space != sectorsize) {
test_msg("Cache free space is not %u\n", sectorsize);
return -EINVAL;
}
offset = btrfs_find_space_for_alloc(cache,
0, sectorsize, 0,
&max_extent_size);
if (offset != (SZ_128M + SZ_16M)) {
test_msg("Failed to allocate %u, returned offset : %llu\n",
sectorsize, offset);
return -EINVAL;
}
ret = check_cache_empty(cache);
if (ret)
return ret;
__btrfs_remove_free_space_cache(cache->free_space_ctl);
/*
* Now test a similar scenario, but where our extent entry is located
* to the right of the bitmap entry, so that we can check that stealing
* space from a bitmap to the front of an extent entry works.
*/
/*
* Extent entry covering free space range [128Mb + 128Kb, 128Mb + 256Kb[
*/
ret = test_add_free_space_entry(cache, SZ_128M + SZ_128K, SZ_128K, 0);
if (ret) {
test_msg("Couldn't add extent entry %d\n", ret);
return ret;
}
/* Bitmap entry covering free space range [0, 128Mb - 512Kb[ */
ret = test_add_free_space_entry(cache, 0, SZ_128M - SZ_512K, 1);
if (ret) {
test_msg("Couldn't add bitmap entry %d\n", ret);
return ret;
}
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* Now make only the last 256Kb of the bitmap marked as free, so that
* we end up with only the following ranges marked as free space:
*
* [128Mb + 128b, 128Mb + 256Kb[
* [128Mb - 768Kb, 128Mb - 512Kb[
*/
ret = btrfs_remove_free_space(cache, 0, SZ_128M - 768 * SZ_1K);
if (ret) {
test_msg("Failed to free part of bitmap space %d\n", ret);
return ret;
}
/* Confirm that only those 2 ranges are marked as free. */
if (!test_check_exists(cache, SZ_128M + SZ_128K, SZ_128K)) {
test_msg("Free space range missing\n");
return -ENOENT;
}
if (!test_check_exists(cache, SZ_128M - 768 * SZ_1K, SZ_256K)) {
test_msg("Free space range missing\n");
return -ENOENT;
}
/*
* Confirm that the bitmap range [0, 128Mb - 768Kb[ isn't marked
* as free anymore.
*/
if (test_check_exists(cache, 0, SZ_128M - 768 * SZ_1K)) {
test_msg("Bitmap region not removed from space cache\n");
return -EINVAL;
}
/*
* Confirm that the region [128Mb - 512Kb, 128Mb[, which is
* covered by the bitmap, isn't marked as free.
*/
if (test_check_exists(cache, SZ_128M - SZ_512K, SZ_512K)) {
test_msg("Invalid bitmap region marked as free\n");
return -EINVAL;
}
/*
* Now lets mark the region [128Mb - 512Kb, 128Mb[ as free too. But,
* lets make sure the free space cache marks it as free in the bitmap,
* and doesn't insert a new extent entry to represent this region.
*/
ret = btrfs_add_free_space(cache, SZ_128M - SZ_512K, SZ_512K);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/* Confirm the region is marked as free. */
if (!test_check_exists(cache, SZ_128M - SZ_512K, SZ_512K)) {
test_msg("Bitmap region not marked as free\n");
return -ENOENT;
}
/*
* Confirm that no new extent entries or bitmap entries were added to
* the cache after adding that free space region.
*/
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* Now lets add a small free space region to the left of the previous
* one, which is not contiguous with it and is part of the bitmap too.
* The goal is to test that the bitmap entry space stealing doesn't
* steal this space region.
*/
ret = btrfs_add_free_space(cache, SZ_32M, 2 * sectorsize);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/*
* Now mark the region [128Mb, 128Mb + 128Kb[ as free too. This will
* expand the range covered by the existing extent entry that represents
* the free space [128Mb + 128Kb, 128Mb + 256Kb[.
*/
ret = btrfs_add_free_space(cache, SZ_128M, SZ_128K);
if (ret) {
test_msg("Error adding free space: %d\n", ret);
return ret;
}
/* Confirm the region is marked as free. */
if (!test_check_exists(cache, SZ_128M, SZ_128K)) {
test_msg("Extent region not marked as free\n");
return -ENOENT;
}
/*
* Confirm that our extent entry didn't stole all free space from the
* bitmap, because of the small 2 * sectorsize free space region.
*/
ret = check_num_extents_and_bitmaps(cache, 2, 1);
if (ret)
return ret;
/*
* So now we have the range [128Mb - 768Kb, 128Mb + 256Kb[ as free
* space. Without stealing bitmap free space into extent entry space,
* we would have all this free space represented by 2 entries in the
* cache:
*
* extent entry covering range: [128Mb, 128Mb + 256Kb[
* bitmap entry covering range: [128Mb - 768Kb, 128Mb[
*
* Attempting to allocate the whole free space (1Mb) would fail, because
* we can't allocate from multiple entries.
* With the bitmap free space stealing, we get a single extent entry
* that represents the 1Mb free space, and therefore we're able to
* allocate the whole free space at once.
*/
if (!test_check_exists(cache, SZ_128M - 768 * SZ_1K, SZ_1M)) {
test_msg("Expected region not marked as free\n");
return -ENOENT;
}
if (cache->free_space_ctl->free_space != (SZ_1M + 2 * sectorsize)) {
test_msg("Cache free space is not 1Mb + %u\n", 2 * sectorsize);
return -EINVAL;
}
offset = btrfs_find_space_for_alloc(cache, 0, SZ_1M, 0,
&max_extent_size);
if (offset != (SZ_128M - 768 * SZ_1K)) {
test_msg("Failed to allocate 1Mb from space cache, returned offset is: %llu\n",
offset);
return -EINVAL;
}
/*
* All that remains is 2 * sectorsize free space region
* in a bitmap. Confirm.
*/
ret = check_num_extents_and_bitmaps(cache, 1, 1);
if (ret)
return ret;
if (cache->free_space_ctl->free_space != 2 * sectorsize) {
test_msg("Cache free space is not %u\n", 2 * sectorsize);
return -EINVAL;
}
offset = btrfs_find_space_for_alloc(cache,
0, 2 * sectorsize, 0,
&max_extent_size);
if (offset != SZ_32M) {
test_msg("Failed to allocate %u, offset: %llu\n",
2 * sectorsize,
offset);
return -EINVAL;
}
ret = check_cache_empty(cache);
if (ret)
return ret;
cache->free_space_ctl->op = orig_free_space_ops;
__btrfs_remove_free_space_cache(cache->free_space_ctl);
return 0;
}
int btrfs_test_free_space_cache(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info;
struct btrfs_block_group_cache *cache;
struct btrfs_root *root = NULL;
int ret = -ENOMEM;
test_msg("Running btrfs free space cache tests\n");
fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
if (!fs_info)
return -ENOMEM;
/*
* For ppc64 (with 64k page size), bytes per bitmap might be
* larger than 1G. To make bitmap test available in ppc64,
* alloc dummy block group whose size cross bitmaps.
*/
cache = btrfs_alloc_dummy_block_group(fs_info,
BITS_PER_BITMAP * sectorsize + PAGE_SIZE);
if (!cache) {
test_msg("Couldn't run the tests\n");
btrfs_free_dummy_fs_info(fs_info);
return 0;
}
root = btrfs_alloc_dummy_root(fs_info);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto out;
}
root->fs_info->extent_root = root;
ret = test_extents(cache);
if (ret)
goto out;
ret = test_bitmaps(cache, sectorsize);
if (ret)
goto out;
ret = test_bitmaps_and_extents(cache, sectorsize);
if (ret)
goto out;
ret = test_steal_space_from_bitmap_to_extent(cache, sectorsize);
out:
btrfs_free_dummy_block_group(cache);
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
test_msg("Free space cache tests finished\n");
return ret;
}
static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info;
struct btrfs_path *path = NULL;
struct btrfs_root *root = NULL;
struct extent_buffer *eb;
struct btrfs_item *item;
char *value = "mary had a little lamb";
char *split1 = "mary had a little";
char *split2 = " lamb";
char *split3 = "mary";
char *split4 = " had a little";
char buf[32];
struct btrfs_key key;
u32 value_len = strlen(value);
int ret = 0;
test_msg("Running btrfs_split_item tests\n");
fs_info = btrfs_alloc_dummy_fs_info();
if (!fs_info) {
test_msg("Could not allocate fs_info\n");
return -ENOMEM;
}
root = btrfs_alloc_dummy_root(fs_info, sectorsize, nodesize);
if (IS_ERR(root)) {
test_msg("Could not allocate root\n");
ret = PTR_ERR(root);
goto out;
}
path = btrfs_alloc_path();
if (!path) {
test_msg("Could not allocate path\n");
ret = -ENOMEM;
goto out;
}
path->nodes[0] = eb = alloc_dummy_extent_buffer(NULL, nodesize,
nodesize);
if (!eb) {
test_msg("Could not allocate dummy buffer\n");
ret = -ENOMEM;
goto out;
}
path->slots[0] = 0;
key.objectid = 0;
key.type = BTRFS_EXTENT_CSUM_KEY;
key.offset = 0;
setup_items_for_insert(root, path, &key, &value_len, value_len,
value_len + sizeof(struct btrfs_item), 1);
item = btrfs_item_nr(0);
write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
value_len);
key.offset = 3;
/*
* Passing NULL trans here should be safe because we have plenty of
* space in this leaf to split the item without having to split the
* leaf.
*/
ret = btrfs_split_item(NULL, root, path, &key, 17);
if (ret) {
test_msg("Split item failed %d\n", ret);
goto out;
}
/*
* Read the first slot, it should have the original key and contain only
* 'mary had a little'
*/
btrfs_item_key_to_cpu(eb, &key, 0);
if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
key.offset != 0) {
test_msg("Invalid key at slot 0\n");
ret = -EINVAL;
goto out;
}
item = btrfs_item_nr(0);
if (btrfs_item_size(eb, item) != strlen(split1)) {
test_msg("Invalid len in the first split\n");
ret = -EINVAL;
goto out;
}
read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
strlen(split1));
if (memcmp(buf, split1, strlen(split1))) {
test_msg("Data in the buffer doesn't match what it should "
"in the first split have='%.*s' want '%s'\n",
(int)strlen(split1), buf, split1);
ret = -EINVAL;
goto out;
}
btrfs_item_key_to_cpu(eb, &key, 1);
if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
key.offset != 3) {
test_msg("Invalid key at slot 1\n");
ret = -EINVAL;
goto out;
}
item = btrfs_item_nr(1);
if (btrfs_item_size(eb, item) != strlen(split2)) {
test_msg("Invalid len in the second split\n");
ret = -EINVAL;
goto out;
}
read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
strlen(split2));
if (memcmp(buf, split2, strlen(split2))) {
test_msg("Data in the buffer doesn't match what it should "
"in the second split\n");
ret = -EINVAL;
goto out;
}
key.offset = 1;
/* Do it again so we test memmoving the other items in the leaf */
ret = btrfs_split_item(NULL, root, path, &key, 4);
if (ret) {
test_msg("Second split item failed %d\n", ret);
goto out;
}
btrfs_item_key_to_cpu(eb, &key, 0);
if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
key.offset != 0) {
test_msg("Invalid key at slot 0\n");
ret = -EINVAL;
goto out;
}
item = btrfs_item_nr(0);
if (btrfs_item_size(eb, item) != strlen(split3)) {
test_msg("Invalid len in the first split\n");
ret = -EINVAL;
goto out;
}
read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
strlen(split3));
if (memcmp(buf, split3, strlen(split3))) {
test_msg("Data in the buffer doesn't match what it should "
"in the third split");
ret = -EINVAL;
goto out;
}
btrfs_item_key_to_cpu(eb, &key, 1);
if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
key.offset != 1) {
test_msg("Invalid key at slot 1\n");
ret = -EINVAL;
goto out;
}
item = btrfs_item_nr(1);
if (btrfs_item_size(eb, item) != strlen(split4)) {
test_msg("Invalid len in the second split\n");
ret = -EINVAL;
goto out;
}
read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
strlen(split4));
if (memcmp(buf, split4, strlen(split4))) {
test_msg("Data in the buffer doesn't match what it should "
"in the fourth split\n");
ret = -EINVAL;
goto out;
}
btrfs_item_key_to_cpu(eb, &key, 2);
if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
key.offset != 3) {
test_msg("Invalid key at slot 2\n");
ret = -EINVAL;
goto out;
}
item = btrfs_item_nr(2);
if (btrfs_item_size(eb, item) != strlen(split2)) {
test_msg("Invalid len in the second split\n");
ret = -EINVAL;
goto out;
}
read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
strlen(split2));
if (memcmp(buf, split2, strlen(split2))) {
test_msg("Data in the buffer doesn't match what it should "
"in the last chunk\n");
ret = -EINVAL;
goto out;
}
out:
btrfs_free_path(path);
btrfs_free_dummy_root(root);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}