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authorOmar Sandoval <osandov@fb.com>2015-09-29 20:50:31 -0700
committerChris Mason <clm@fb.com>2015-12-17 12:16:46 -0800
commit0f3312295d3ce1d82392244236a52b3b663480ef (patch)
tree1e75388907006f7c2c64e539ef6e3e5c5cd6453a /fs/btrfs/tests/extent-io-tests.c
parent3e1e8bb770dba29645b302c5499ffcb8e3906712 (diff)
downloadlinux-sh-0f3312295d3ce1d82392244236a52b3b663480ef.tar.gz
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>
Diffstat (limited to 'fs/btrfs/tests/extent-io-tests.c')
-rw-r--r--fs/btrfs/tests/extent-io-tests.c138
1 files changed, 136 insertions, 2 deletions
diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
index 9e9f2368177d..71ab575e7633 100644
--- a/fs/btrfs/tests/extent-io-tests.c
+++ b/fs/btrfs/tests/extent-io-tests.c
@@ -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;
}