Commit bf2e2eb0 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba

btrfs: Add self-tests for btrfs_rmap_block

Add RAID1 and single testcases to verify that data stripes are excluded
from super block locations and that the address mapping is valid.
Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b3ad2c17
......@@ -6,6 +6,9 @@
#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)
{
......@@ -437,11 +440,153 @@ static int test_case_4(struct btrfs_fs_info *fs_info,
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, 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;
int ret = 0, i;
struct rmap_test_vector rmap_tests[] = {
{
/*
* Test a chunk with 2 data stripes one of which
* interesects 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");
......@@ -474,6 +619,13 @@ int btrfs_test_extent_map(void)
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);
......
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