blob: 319fed82d741fa846164fbfce0ba165364b532ad [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 Oracle. All rights reserved.
*/
#include <linux/types.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../volumes.h"
#include "../disk-io.h"
#include "../block-group.h"
static void free_extent_map_tree(struct extent_map_tree *em_tree)
{
struct extent_map *em;
struct rb_node *node;
while (!RB_EMPTY_ROOT(&em_tree->map.rb_root)) {
node = rb_first_cached(&em_tree->map);
em = rb_entry(node, struct extent_map, rb_node);
remove_extent_mapping(em_tree, em);
#ifdef CONFIG_BTRFS_DEBUG
if (refcount_read(&em->refs) != 1) {
test_err(
"em leak: em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx) refs %d",
em->start, em->len, em->block_start,
em->block_len, refcount_read(&em->refs));
refcount_set(&em->refs, 1);
}
#endif
free_extent_map(em);
}
}
/*
* Test scenario:
*
* Suppose that no extent map has been loaded into memory yet, there is a file
* extent [0, 16K), followed by another file extent [16K, 20K), two dio reads
* are entering btrfs_get_extent() concurrently, t1 is reading [8K, 16K), t2 is
* reading [0, 8K)
*
* t1 t2
* btrfs_get_extent() btrfs_get_extent()
* -> lookup_extent_mapping() ->lookup_extent_mapping()
* -> add_extent_mapping(0, 16K)
* -> return em
* ->add_extent_mapping(0, 16K)
* -> #handle -EEXIST
*/
static int test_case_1(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree)
{
struct extent_map *em;
u64 start = 0;
u64 len = SZ_8K;
int ret;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
/* Add [0, 16K) */
em->start = 0;
em->len = SZ_16K;
em->block_start = 0;
em->block_len = SZ_16K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [0, 16K)");
goto out;
}
free_extent_map(em);
/* Add [16K, 20K) following [0, 16K) */
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
em->start = SZ_16K;
em->len = SZ_4K;
em->block_start = SZ_32K; /* avoid merging */
em->block_len = SZ_4K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [16K, 20K)");
goto out;
}
free_extent_map(em);
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
/* Add [0, 8K), should return [0, 16K) instead. */
em->start = start;
em->len = len;
em->block_start = start;
em->block_len = len;
write_lock(&em_tree->lock);
ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
write_unlock(&em_tree->lock);
if (ret) {
test_err("case1 [%llu %llu]: ret %d", start, start + len, ret);
goto out;
}
if (em &&
(em->start != 0 || extent_map_end(em) != SZ_16K ||
em->block_start != 0 || em->block_len != SZ_16K)) {
test_err(
"case1 [%llu %llu]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
start, start + len, ret, em->start, em->len,
em->block_start, em->block_len);
ret = -EINVAL;
}
free_extent_map(em);
out:
free_extent_map_tree(em_tree);
return ret;
}
/*
* Test scenario:
*
* Reading the inline ending up with EEXIST, ie. read an inline
* extent and discard page cache and read it again.
*/
static int test_case_2(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree)
{
struct extent_map *em;
int ret;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
/* Add [0, 1K) */
em->start = 0;
em->len = SZ_1K;
em->block_start = EXTENT_MAP_INLINE;
em->block_len = (u64)-1;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [0, 1K)");
goto out;
}
free_extent_map(em);
/* Add [4K, 8K) following [0, 1K) */
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
em->start = SZ_4K;
em->len = SZ_4K;
em->block_start = SZ_4K;
em->block_len = SZ_4K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [4K, 8K)");
goto out;
}
free_extent_map(em);
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
/* Add [0, 1K) */
em->start = 0;
em->len = SZ_1K;
em->block_start = EXTENT_MAP_INLINE;
em->block_len = (u64)-1;
write_lock(&em_tree->lock);
ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
write_unlock(&em_tree->lock);
if (ret) {
test_err("case2 [0 1K]: ret %d", ret);
goto out;
}
if (em &&
(em->start != 0 || extent_map_end(em) != SZ_1K ||
em->block_start != EXTENT_MAP_INLINE || em->block_len != (u64)-1)) {
test_err(
"case2 [0 1K]: ret %d return a wrong em (start %llu len %llu block_start %llu block_len %llu",
ret, em->start, em->len, em->block_start,
em->block_len);
ret = -EINVAL;
}
free_extent_map(em);
out:
free_extent_map_tree(em_tree);
return ret;
}
static int __test_case_3(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree, u64 start)
{
struct extent_map *em;
u64 len = SZ_4K;
int ret;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
/* Add [4K, 8K) */
em->start = SZ_4K;
em->len = SZ_4K;
em->block_start = SZ_4K;
em->block_len = SZ_4K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [4K, 8K)");
goto out;
}
free_extent_map(em);
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
/* Add [0, 16K) */
em->start = 0;
em->len = SZ_16K;
em->block_start = 0;
em->block_len = SZ_16K;
write_lock(&em_tree->lock);
ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
write_unlock(&em_tree->lock);
if (ret) {
test_err("case3 [0x%llx 0x%llx): ret %d",
start, start + len, ret);
goto out;
}
/*
* Since bytes within em are contiguous, em->block_start is identical to
* em->start.
*/
if (em &&
(start < em->start || start + len > extent_map_end(em) ||
em->start != em->block_start || em->len != em->block_len)) {
test_err(
"case3 [0x%llx 0x%llx): ret %d em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
start, start + len, ret, em->start, em->len,
em->block_start, em->block_len);
ret = -EINVAL;
}
free_extent_map(em);
out:
free_extent_map_tree(em_tree);
return ret;
}
/*
* Test scenario:
*
* Suppose that no extent map has been loaded into memory yet.
* There is a file extent [0, 16K), two jobs are running concurrently
* against it, t1 is buffered writing to [4K, 8K) and t2 is doing dio
* read from [0, 4K) or [8K, 12K) or [12K, 16K).
*
* t1 goes ahead of t2 and adds em [4K, 8K) into tree.
*
* t1 t2
* cow_file_range() btrfs_get_extent()
* -> lookup_extent_mapping()
* -> add_extent_mapping()
* -> add_extent_mapping()
*/
static int test_case_3(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree)
{
int ret;
ret = __test_case_3(fs_info, em_tree, 0);
if (ret)
return ret;
ret = __test_case_3(fs_info, em_tree, SZ_8K);
if (ret)
return ret;
ret = __test_case_3(fs_info, em_tree, (12 * SZ_1K));
return ret;
}
static int __test_case_4(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree, u64 start)
{
struct extent_map *em;
u64 len = SZ_4K;
int ret;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
/* Add [0K, 8K) */
em->start = 0;
em->len = SZ_8K;
em->block_start = 0;
em->block_len = SZ_8K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [0, 8K)");
goto out;
}
free_extent_map(em);
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
/* Add [8K, 32K) */
em->start = SZ_8K;
em->len = 24 * SZ_1K;
em->block_start = SZ_16K; /* avoid merging */
em->block_len = 24 * SZ_1K;
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret < 0) {
test_err("cannot add extent range [8K, 32K)");
goto out;
}
free_extent_map(em);
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
ret = -ENOMEM;
goto out;
}
/* Add [0K, 32K) */
em->start = 0;
em->len = SZ_32K;
em->block_start = 0;
em->block_len = SZ_32K;
write_lock(&em_tree->lock);
ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
write_unlock(&em_tree->lock);
if (ret) {
test_err("case4 [0x%llx 0x%llx): ret %d",
start, len, ret);
goto out;
}
if (em && (start < em->start || start + len > extent_map_end(em))) {
test_err(
"case4 [0x%llx 0x%llx): ret %d, added wrong em (start 0x%llx len 0x%llx block_start 0x%llx block_len 0x%llx)",
start, len, ret, em->start, em->len, em->block_start,
em->block_len);
ret = -EINVAL;
}
free_extent_map(em);
out:
free_extent_map_tree(em_tree);
return ret;
}
/*
* Test scenario:
*
* Suppose that no extent map has been loaded into memory yet.
* There is a file extent [0, 32K), two jobs are running concurrently
* against it, t1 is doing dio write to [8K, 32K) and t2 is doing dio
* read from [0, 4K) or [4K, 8K).
*
* t1 goes ahead of t2 and splits em [0, 32K) to em [0K, 8K) and [8K 32K).
*
* t1 t2
* btrfs_get_blocks_direct() btrfs_get_blocks_direct()
* -> btrfs_get_extent() -> btrfs_get_extent()
* -> lookup_extent_mapping()
* -> add_extent_mapping() -> lookup_extent_mapping()
* # load [0, 32K)
* -> btrfs_new_extent_direct()
* -> btrfs_drop_extent_cache()
* # split [0, 32K)
* -> add_extent_mapping()
* # add [8K, 32K)
* -> add_extent_mapping()
* # handle -EEXIST when adding
* # [0, 32K)
*/
static int test_case_4(struct btrfs_fs_info *fs_info,
struct extent_map_tree *em_tree)
{
int ret;
ret = __test_case_4(fs_info, em_tree, 0);
if (ret)
return ret;
ret = __test_case_4(fs_info, em_tree, SZ_4K);
return ret;
}
struct rmap_test_vector {
u64 raid_type;
u64 physical_start;
u64 data_stripe_size;
u64 num_data_stripes;
u64 num_stripes;
/* Assume we won't have more than 5 physical stripes */
u64 data_stripe_phys_start[5];
bool expected_mapped_addr;
/* Physical to logical addresses */
u64 mapped_logical[5];
};
static int test_rmap_block(struct btrfs_fs_info *fs_info,
struct rmap_test_vector *test)
{
struct extent_map *em;
struct map_lookup *map = NULL;
u64 *logical = NULL;
int i, out_ndaddrs, out_stripe_len;
int ret;
em = alloc_extent_map();
if (!em) {
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
map = kmalloc(map_lookup_size(test->num_stripes), GFP_KERNEL);
if (!map) {
kfree(em);
test_std_err(TEST_ALLOC_EXTENT_MAP);
return -ENOMEM;
}
set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
/* Start at 4GiB logical address */
em->start = SZ_4G;
em->len = test->data_stripe_size * test->num_data_stripes;
em->block_len = em->len;
em->orig_block_len = test->data_stripe_size;
em->map_lookup = map;
map->num_stripes = test->num_stripes;
map->stripe_len = BTRFS_STRIPE_LEN;
map->type = test->raid_type;
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);
if (IS_ERR(dev)) {
test_err("cannot allocate device");
ret = PTR_ERR(dev);
goto out;
}
map->stripes[i].dev = dev;
map->stripes[i].physical = test->data_stripe_phys_start[i];
}
write_lock(&fs_info->mapping_tree.lock);
ret = add_extent_mapping(&fs_info->mapping_tree, em, 0);
write_unlock(&fs_info->mapping_tree.lock);
if (ret) {
test_err("error adding block group mapping to mapping tree");
goto out_free;
}
ret = btrfs_rmap_block(fs_info, em->start, NULL, btrfs_sb_offset(1),
&logical, &out_ndaddrs, &out_stripe_len);
if (ret || (out_ndaddrs == 0 && test->expected_mapped_addr)) {
test_err("didn't rmap anything but expected %d",
test->expected_mapped_addr);
goto out;
}
if (out_stripe_len != BTRFS_STRIPE_LEN) {
test_err("calculated stripe length doesn't match");
goto out;
}
if (out_ndaddrs != test->expected_mapped_addr) {
for (i = 0; i < out_ndaddrs; i++)
test_msg("mapped %llu", logical[i]);
test_err("unexpected number of mapped addresses: %d", out_ndaddrs);
goto out;
}
for (i = 0; i < out_ndaddrs; i++) {
if (logical[i] != test->mapped_logical[i]) {
test_err("unexpected logical address mapped");
goto out;
}
}
ret = 0;
out:
write_lock(&fs_info->mapping_tree.lock);
remove_extent_mapping(&fs_info->mapping_tree, em);
write_unlock(&fs_info->mapping_tree.lock);
/* For us */
free_extent_map(em);
out_free:
/* For the tree */
free_extent_map(em);
kfree(logical);
return ret;
}
int btrfs_test_extent_map(void)
{
struct btrfs_fs_info *fs_info = NULL;
struct extent_map_tree *em_tree;
int ret = 0, i;
struct rmap_test_vector rmap_tests[] = {
{
/*
* Test a chunk with 2 data stripes one of which
* intersects the physical address of the super block
* is correctly recognised.
*/
.raid_type = BTRFS_BLOCK_GROUP_RAID1,
.physical_start = SZ_64M - SZ_4M,
.data_stripe_size = SZ_256M,
.num_data_stripes = 2,
.num_stripes = 2,
.data_stripe_phys_start =
{SZ_64M - SZ_4M, SZ_64M - SZ_4M + SZ_256M},
.expected_mapped_addr = true,
.mapped_logical= {SZ_4G + SZ_4M}
},
{
/*
* Test that out-of-range physical addresses are
* ignored
*/
/* SINGLE chunk type */
.raid_type = 0,
.physical_start = SZ_4G,
.data_stripe_size = SZ_256M,
.num_data_stripes = 1,
.num_stripes = 1,
.data_stripe_phys_start = {SZ_256M},
.expected_mapped_addr = false,
.mapped_logical = {0}
}
};
test_msg("running extent_map tests");
/*
* Note: the fs_info is not set up completely, we only need
* fs_info::fsid for the tracepoint.
*/
fs_info = btrfs_alloc_dummy_fs_info(PAGE_SIZE, PAGE_SIZE);
if (!fs_info) {
test_std_err(TEST_ALLOC_FS_INFO);
return -ENOMEM;
}
em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
if (!em_tree) {
ret = -ENOMEM;
goto out;
}
extent_map_tree_init(em_tree);
ret = test_case_1(fs_info, em_tree);
if (ret)
goto out;
ret = test_case_2(fs_info, em_tree);
if (ret)
goto out;
ret = test_case_3(fs_info, em_tree);
if (ret)
goto out;
ret = test_case_4(fs_info, em_tree);
test_msg("running rmap tests");
for (i = 0; i < ARRAY_SIZE(rmap_tests); i++) {
ret = test_rmap_block(fs_info, &rmap_tests[i]);
if (ret)
goto out;
}
out:
kfree(em_tree);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}