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Btrfs: add extent buffer bitmap sanity tests

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Sanity test the extent buffer bitmap operations (test, set, and clear)
against the equivalent standard kernel operations.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Omar Sandoval 2015-09-29 20:50:31 -07:00 committed by Chris Mason
parent 3e1e8bb770
commit 0f3312295d
3 changed files with 160 additions and 16 deletions
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34
fs/btrfs/extent_io.c
View File

@ -4730,24 +4730,14 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
return new;
}
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start, unsigned long len)
{
struct extent_buffer *eb;
unsigned long len;
unsigned long num_pages;
unsigned long i;
if (!fs_info) {
/*
* Called only from tests that don't always have a fs_info
* available, but we know that nodesize is 4096
*/
len = 4096;
} else {
len = fs_info->tree_root->nodesize;
}
num_pages = num_extent_pages(0, len);
num_pages = num_extent_pages(start, len);
eb = __alloc_extent_buffer(fs_info, start, len);
if (!eb)
@ -4770,6 +4760,24 @@ err:
return NULL;
}
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
{
unsigned long len;
if (!fs_info) {
/*
* Called only from tests that don't always have a fs_info
* available, but we know that nodesize is 4096
*/
len = 4096;
} else {
len = fs_info->tree_root->nodesize;
}
return __alloc_dummy_extent_buffer(fs_info, start, len);
}
static void check_buffer_tree_ref(struct extent_buffer *eb)
{
int refs;

4
fs/btrfs/extent_io.h
View File

@ -263,8 +263,10 @@ void set_page_extent_mapped(struct page *page);
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);
u64 start);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);

138
fs/btrfs/tests/extent-io-tests.c
View File

@ -18,6 +18,7 @@
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "btrfs-tests.h"
#include "../extent_io.h"
@ -76,6 +77,8 @@ static int test_find_delalloc(void)
u64 found;
int ret = -EINVAL;
test_msg("Running find delalloc tests\n");
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Failed to allocate test inode\n");
@ -268,8 +271,139 @@ out:
return ret;
}
static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
unsigned long len)
{
unsigned long i, x;
memset(bitmap, 0, len);
memset_extent_buffer(eb, 0, 0, len);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Bitmap was not zeroed\n");
return -EINVAL;
}
bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Setting all bits failed\n");
return -EINVAL;
}
bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Clearing all bits failed\n");
return -EINVAL;
}
bitmap_set(bitmap, (PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
sizeof(long) * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
sizeof(long) * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Setting straddling pages failed\n");
return -EINVAL;
}
bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
bitmap_clear(bitmap,
(PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
sizeof(long) * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_clear(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
sizeof(long) * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Clearing straddling pages failed\n");
return -EINVAL;
}
/*
* Generate a wonky pseudo-random bit pattern for the sake of not using
* something repetitive that could miss some hypothetical off-by-n bug.
*/
x = 0;
for (i = 0; i < len / sizeof(long); i++) {
x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
bitmap[i] = x;
}
write_extent_buffer(eb, bitmap, 0, len);
for (i = 0; i < len * BITS_PER_BYTE; i++) {
int bit, bit1;
bit = !!test_bit(i, bitmap);
bit1 = !!extent_buffer_test_bit(eb, 0, i);
if (bit1 != bit) {
test_msg("Testing bit pattern failed\n");
return -EINVAL;
}
bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
i % BITS_PER_BYTE);
if (bit1 != bit) {
test_msg("Testing bit pattern with offset failed\n");
return -EINVAL;
}
}
return 0;
}
static int test_eb_bitmaps(void)
{
unsigned long len = PAGE_CACHE_SIZE * 4;
unsigned long *bitmap;
struct extent_buffer *eb;
int ret;
test_msg("Running extent buffer bitmap tests\n");
bitmap = kmalloc(len, GFP_NOFS);
if (!bitmap) {
test_msg("Couldn't allocate test bitmap\n");
return -ENOMEM;
}
eb = __alloc_dummy_extent_buffer(NULL, 0, len);
if (!eb) {
test_msg("Couldn't allocate test extent buffer\n");
kfree(bitmap);
return -ENOMEM;
}
ret = __test_eb_bitmaps(bitmap, eb, len);
if (ret)
goto out;
/* Do it over again with an extent buffer which isn't page-aligned. */
free_extent_buffer(eb);
eb = __alloc_dummy_extent_buffer(NULL, PAGE_CACHE_SIZE / 2, len);
if (!eb) {
test_msg("Couldn't allocate test extent buffer\n");
kfree(bitmap);
return -ENOMEM;
}
ret = __test_eb_bitmaps(bitmap, eb, len);
out:
free_extent_buffer(eb);
kfree(bitmap);
return ret;
}
int btrfs_test_extent_io(void)
{
test_msg("Running find delalloc tests\n");
return test_find_delalloc();
int ret;
test_msg("Running extent I/O tests\n");
ret = test_find_delalloc();
if (ret)
goto out;
ret = test_eb_bitmaps();
out:
test_msg("Extent I/O tests finished\n");
return ret;
}