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Btrfs: unaligned access fixes

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Btrfs set/get macros lose type information needed to avoid
unaligned accesses on sparc64.
ere is a patch for the kernel bits which fixes most of the
unaligned accesses on sparc64.

btrfs_name_hash is modified to return the hash value instead
of getting a return location via a (potentially unaligned)
pointer.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
David Miller
2008-02-15 10:40:52 -05:00
committed by Chris Mason
parent 39b5637f6f
commit df68b8a7ad
5 changed files with 33 additions and 45 deletions
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17
fs/btrfs/hash.c
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@@ -76,19 +76,18 @@ static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
*buf++ = pad;
}
int btrfs_name_hash(const char *name, int len, u64 *hash_result)
u64 btrfs_name_hash(const char *name, int len)
{
__u32 hash;
__u32 minor_hash = 0;
const char *p;
__u32 in[8], buf[2];
u64 hash_result;
if (len == 1 && *name == '.') {
*hash_result = 1;
return 0;
return 1;
} else if (len == 2 && name[0] == '.' && name[1] == '.') {
*hash_result = 2;
return 0;
return 2;
}
/* Initialize the default seed for the hash checksum functions */
@@ -106,8 +105,8 @@ int btrfs_name_hash(const char *name, int len, u64 *hash_result)
}
hash = buf[0];
minor_hash = buf[1];
*hash_result = buf[0];
*hash_result <<= 32;
*hash_result |= buf[1];
return 0;
hash_result = buf[0];
hash_result <<= 32;
hash_result |= buf[1];
return hash_result;
}