vfs: make the string hashes salt the hash
We always mixed in the parent pointer into the dentry name hash, but we
did it late at lookup time. It turns out that we can simplify that
lookup-time action by salting the hash with the parent pointer early
instead of late.
A few other users of our string hashes also wanted to mix in their own
pointers into the hash, and those are updated to use the same mechanism.
Hash users that don't have any particular initial salt can just use the
NULL pointer as a no-salt.
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: George Spelvin <linux@sciencehorizons.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/test_hash.c b/lib/test_hash.c
index c9549c8..66c5fc8 100644
--- a/lib/test_hash.c
+++ b/lib/test_hash.c
@@ -155,8 +155,8 @@
buf[j] = '\0';
for (i = 0; i <= j; i++) {
- u64 hashlen = hashlen_string(buf+i);
- u32 h0 = full_name_hash(buf+i, j-i);
+ u64 hashlen = hashlen_string(buf+i, buf+i);
+ u32 h0 = full_name_hash(buf+i, buf+i, j-i);
/* Check that hashlen_string gets the length right */
if (hashlen_len(hashlen) != j-i) {