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btrfs: tests: add self tests for extent buffer memory operations

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The new self tests would populate a memory range with random bytes, then
copy it to the extent buffer, so that we can verify if the extent buffer
memory operation and memmove()/memcopy() are resulting the same
contents.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-07-15 19:08:28 +08:00 committed by David Sterba
parent 257deed2a9
commit 5864f1da6b
1 changed files with 144 additions and 0 deletions
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144
fs/btrfs/tests/extent-io-tests.c
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@ -648,6 +648,146 @@ static int test_find_first_clear_extent_bit(void)
return ret;
}
static void dump_eb_and_memory_contents(struct extent_buffer *eb, void *memory,
const char *test_name)
{
for (int i = 0; i < eb->len; i++) {
struct page *page = eb->pages[i >> PAGE_SHIFT];
void *addr = page_address(page) + offset_in_page(i);
if (memcmp(addr, memory + i, 1) != 0) {
test_err("%s failed", test_name);
test_err("eb and memory diffs at byte %u, eb has 0x%02x memory has 0x%02x",
i, *(u8 *)addr, *(u8 *)(memory + i));
return;
}
}
}
static int verify_eb_and_memory(struct extent_buffer *eb, void *memory,
const char *test_name)
{
for (int i = 0; i < (eb->len >> PAGE_SHIFT); i++) {
void *eb_addr = page_address(eb->pages[i]);
if (memcmp(memory + (i << PAGE_SHIFT), eb_addr, PAGE_SIZE) != 0) {
dump_eb_and_memory_contents(eb, memory, test_name);
return -EUCLEAN;
}
}
return 0;
}
/*
* Init both memory and extent buffer contents to the same randomly generated
* contents.
*/
static void init_eb_and_memory(struct extent_buffer *eb, void *memory)
{
get_random_bytes(memory, eb->len);
write_extent_buffer(eb, memory, 0, eb->len);
}
static int test_eb_mem_ops(u32 sectorsize, u32 nodesize)
{
struct btrfs_fs_info *fs_info;
struct extent_buffer *eb = NULL;
void *memory = NULL;
int ret;
test_msg("running extent buffer memory operation tests");
fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
if (!fs_info) {
test_std_err(TEST_ALLOC_FS_INFO);
return -ENOMEM;
}
memory = kvzalloc(nodesize, GFP_KERNEL);
if (!memory) {
test_err("failed to allocate memory");
ret = -ENOMEM;
goto out;
}
eb = __alloc_dummy_extent_buffer(fs_info, SZ_1M, nodesize);
if (!eb) {
test_std_err(TEST_ALLOC_EXTENT_BUFFER);
ret = -ENOMEM;
goto out;
}
init_eb_and_memory(eb, memory);
ret = verify_eb_and_memory(eb, memory, "full eb write");
if (ret < 0)
goto out;
memcpy(memory, memory + 16, 16);
memcpy_extent_buffer(eb, 0, 16, 16);
ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 1");
if (ret < 0)
goto out;
memcpy(memory, memory + 2048, 16);
memcpy_extent_buffer(eb, 0, 2048, 16);
ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 2");
if (ret < 0)
goto out;
memcpy(memory, memory + 2048, 2048);
memcpy_extent_buffer(eb, 0, 2048, 2048);
ret = verify_eb_and_memory(eb, memory, "same page non-overlapping memcpy 3");
if (ret < 0)
goto out;
memmove(memory + 512, memory + 256, 512);
memmove_extent_buffer(eb, 512, 256, 512);
ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 1");
if (ret < 0)
goto out;
memmove(memory + 2048, memory + 512, 2048);
memmove_extent_buffer(eb, 2048, 512, 2048);
ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 2");
if (ret < 0)
goto out;
memmove(memory + 512, memory + 2048, 2048);
memmove_extent_buffer(eb, 512, 2048, 2048);
ret = verify_eb_and_memory(eb, memory, "same page overlapping memcpy 3");
if (ret < 0)
goto out;
if (nodesize > PAGE_SIZE) {
memcpy(memory, memory + 4096 - 128, 256);
memcpy_extent_buffer(eb, 0, 4096 - 128, 256);
ret = verify_eb_and_memory(eb, memory, "cross page non-overlapping memcpy 1");
if (ret < 0)
goto out;
memcpy(memory + 4096 - 128, memory + 4096 + 128, 256);
memcpy_extent_buffer(eb, 4096 - 128, 4096 + 128, 256);
ret = verify_eb_and_memory(eb, memory, "cross page non-overlapping memcpy 2");
if (ret < 0)
goto out;
memmove(memory + 4096 - 128, memory + 4096 - 64, 256);
memmove_extent_buffer(eb, 4096 - 128, 4096 - 64, 256);
ret = verify_eb_and_memory(eb, memory, "cross page overlapping memcpy 1");
if (ret < 0)
goto out;
memmove(memory + 4096 - 64, memory + 4096 - 128, 256);
memmove_extent_buffer(eb, 4096 - 64, 4096 - 128, 256);
ret = verify_eb_and_memory(eb, memory, "cross page overlapping memcpy 2");
if (ret < 0)
goto out;
}
out:
free_extent_buffer(eb);
kvfree(memory);
btrfs_free_dummy_fs_info(fs_info);
return ret;
}
int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
{
int ret;
@ -663,6 +803,10 @@ int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
goto out;
ret = test_eb_bitmaps(sectorsize, nodesize);
if (ret)
goto out;
ret = test_eb_mem_ops(sectorsize, nodesize);
out:
return ret;
}