Commit 34b3e6c9 authored by Feifei Xu's avatar Feifei Xu Committed by David Sterba
Browse files

Btrfs: self-tests: Fix extent buffer bitmap test fail on BE system

In __test_eb_bitmaps(), we write random data to a bitmap. Then copy
the bitmap to another bitmap that resides inside an extent buffer.
Later we verify the values of corresponding bits in the bitmap and the
bitmap inside the extent buffer. However, extent_buffer_test_bit()
reads in byte granularity while test_bit() reads in unsigned long
granularity. Hence we end up comparing wrong bits on big-endian
systems such as ppc64. This commit fixes the issue by reading the
bitmap in byte granularity.
Reviewed-by: default avatarJosef Bacik <>
Reviewed-by: default avatarChandan Rajendra <>
Signed-off-by: default avatarFeifei Xu <>
Signed-off-by: default avatarDavid Sterba <>
parent 36b3dc05
......@@ -273,6 +273,16 @@ out:
return ret;
* test_bit_in_byte - Determine whether a bit is set in a byte
* @nr: bit number to test
* @addr: Address to start counting from
static inline int test_bit_in_byte(int nr, const u8 *addr)
return 1UL & (addr[nr / BITS_PER_BYTE] >> (nr & (BITS_PER_BYTE - 1)));
static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
unsigned long len)
......@@ -338,7 +348,7 @@ static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
for (i = 0; i < len * BITS_PER_BYTE; i++) {
int bit, bit1;
bit = !!test_bit(i, bitmap);
bit = !!test_bit_in_byte(i, (u8 *)bitmap);
bit1 = !!extent_buffer_test_bit(eb, 0, i);
if (bit1 != bit) {
test_msg("Testing bit pattern failed\n");
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