View File fsck_gfs2_unaligned_access_on_ia64_part2.patch of Package cluster (Project home:sschapiro:openstack:upstream)
Author: Bob Peterson <firstname.lastname@example.org>
Date: Tue Jul 27 20:18:18 2010 -0500
GFS2: libgfs2 bitfit algorithm using wrong shift point
This patch fixes a problem specific to 32-bit architectures.
The shift point calculation for determining where to start looking
for a desired value in the bitmap was wrong because it was
using sizeof(unsigned long) rather than sizeof(unsigned long long).
That caused the bitfit function to start in the wrong place, which
in some circumstances caused the same block to be returned repeatedly
which resulted in infinite loops in fsck.gfs2.
diff --git a/gfs2/libgfs2/fs_bits.c b/gfs2/libgfs2/fs_bits.c
index 380dd81..c2934a6 100644
@@ -64,7 +64,7 @@ static inline uint64_t gfs2_bit_search(const unsigned long long *ptr,
unsigned long gfs2_bitfit(const unsigned char *buf, const unsigned int len,
unsigned long goal, unsigned char state)
- unsigned long spoint = (goal << 1) & ((8 * sizeof(unsigned long)) - 1);
+ unsigned long spoint = (goal << 1) & ((8 * sizeof(unsigned long long)) - 1);
const unsigned long long *ptr = ((unsigned long long *)buf) + (goal >> 5);
const unsigned long long *end = (unsigned long long *)
(buf + ALIGN(len, sizeof(unsigned long long)));