Btrfs: add extent buffer bitmap sanity tests
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>
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3e1e8bb770
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0f3312295d
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@ -4730,24 +4730,14 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
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return new;
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}
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start)
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struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start, unsigned long len)
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{
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struct extent_buffer *eb;
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unsigned long len;
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unsigned long num_pages;
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unsigned long i;
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if (!fs_info) {
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/*
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* Called only from tests that don't always have a fs_info
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* available, but we know that nodesize is 4096
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*/
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len = 4096;
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} else {
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len = fs_info->tree_root->nodesize;
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}
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num_pages = num_extent_pages(0, len);
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num_pages = num_extent_pages(start, len);
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eb = __alloc_extent_buffer(fs_info, start, len);
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if (!eb)
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@ -4770,6 +4760,24 @@ err:
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return NULL;
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}
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start)
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{
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unsigned long len;
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if (!fs_info) {
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/*
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* Called only from tests that don't always have a fs_info
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* available, but we know that nodesize is 4096
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*/
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len = 4096;
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} else {
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len = fs_info->tree_root->nodesize;
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}
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return __alloc_dummy_extent_buffer(fs_info, start, len);
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}
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static void check_buffer_tree_ref(struct extent_buffer *eb)
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{
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int refs;
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@ -263,8 +263,10 @@ void set_page_extent_mapped(struct page *page);
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start, unsigned long len);
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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u64 start);
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struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
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struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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@ -18,6 +18,7 @@
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "btrfs-tests.h"
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#include "../extent_io.h"
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@ -76,6 +77,8 @@ static int test_find_delalloc(void)
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u64 found;
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int ret = -EINVAL;
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test_msg("Running find delalloc tests\n");
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inode = btrfs_new_test_inode();
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if (!inode) {
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test_msg("Failed to allocate test inode\n");
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@ -268,8 +271,139 @@ out:
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return ret;
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}
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static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
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unsigned long len)
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{
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unsigned long i, x;
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memset(bitmap, 0, len);
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memset_extent_buffer(eb, 0, 0, len);
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if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
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test_msg("Bitmap was not zeroed\n");
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return -EINVAL;
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}
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bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
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extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
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if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
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test_msg("Setting all bits failed\n");
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return -EINVAL;
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}
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bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
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extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
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if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
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test_msg("Clearing all bits failed\n");
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return -EINVAL;
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}
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bitmap_set(bitmap, (PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
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sizeof(long) * BITS_PER_BYTE);
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extent_buffer_bitmap_set(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
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sizeof(long) * BITS_PER_BYTE);
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if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
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test_msg("Setting straddling pages failed\n");
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return -EINVAL;
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}
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bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
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bitmap_clear(bitmap,
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(PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
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sizeof(long) * BITS_PER_BYTE);
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extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
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extent_buffer_bitmap_clear(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
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sizeof(long) * BITS_PER_BYTE);
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if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
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test_msg("Clearing straddling pages failed\n");
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return -EINVAL;
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}
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/*
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* Generate a wonky pseudo-random bit pattern for the sake of not using
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* something repetitive that could miss some hypothetical off-by-n bug.
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*/
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x = 0;
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for (i = 0; i < len / sizeof(long); i++) {
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x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
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bitmap[i] = x;
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}
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write_extent_buffer(eb, bitmap, 0, len);
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for (i = 0; i < len * BITS_PER_BYTE; i++) {
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int bit, bit1;
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bit = !!test_bit(i, bitmap);
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bit1 = !!extent_buffer_test_bit(eb, 0, i);
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if (bit1 != bit) {
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test_msg("Testing bit pattern failed\n");
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return -EINVAL;
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}
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bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
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i % BITS_PER_BYTE);
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if (bit1 != bit) {
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test_msg("Testing bit pattern with offset failed\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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static int test_eb_bitmaps(void)
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{
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unsigned long len = PAGE_CACHE_SIZE * 4;
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unsigned long *bitmap;
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struct extent_buffer *eb;
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int ret;
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test_msg("Running extent buffer bitmap tests\n");
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bitmap = kmalloc(len, GFP_NOFS);
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if (!bitmap) {
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test_msg("Couldn't allocate test bitmap\n");
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return -ENOMEM;
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}
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eb = __alloc_dummy_extent_buffer(NULL, 0, len);
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if (!eb) {
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test_msg("Couldn't allocate test extent buffer\n");
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kfree(bitmap);
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return -ENOMEM;
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}
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ret = __test_eb_bitmaps(bitmap, eb, len);
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if (ret)
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goto out;
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/* Do it over again with an extent buffer which isn't page-aligned. */
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free_extent_buffer(eb);
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eb = __alloc_dummy_extent_buffer(NULL, PAGE_CACHE_SIZE / 2, len);
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if (!eb) {
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test_msg("Couldn't allocate test extent buffer\n");
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kfree(bitmap);
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return -ENOMEM;
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}
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ret = __test_eb_bitmaps(bitmap, eb, len);
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out:
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free_extent_buffer(eb);
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kfree(bitmap);
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return ret;
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}
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int btrfs_test_extent_io(void)
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{
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test_msg("Running find delalloc tests\n");
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return test_find_delalloc();
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int ret;
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test_msg("Running extent I/O tests\n");
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ret = test_find_delalloc();
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if (ret)
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goto out;
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ret = test_eb_bitmaps();
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out:
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test_msg("Extent I/O tests finished\n");
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return ret;
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}
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