Fix name re-hashing semantics

We handled the case of removing and re-inserting cache entries badly,
which is something that merging commonly needs to do (removing the
different stages, and then re-inserting one of them as the merged
state).

We even had a rather ugly special case for this failure case, where
replace_index_entry() basically turned itself into a no-op if the new
and the old entries were the same, exactly because the hash routines
didn't handle it on their own.

So what this patch does is to not just have the UNHASHED bit, but a
HASHED bit too, and when you insert an entry into the name hash, that
involves:

 - clear the UNHASHED bit, because now it's valid again for lookup
   (which is really all that UNHASHED meant)

 - if we're being lazy, we're done here (but we still want to clear the
   UNHASHED bit regardless of lazy mode, since we can become unlazy
   later, and so we need the UNHASHED bit to always be set correctly,
   even if we never actually insert the entry into the hash list)

 - if it was already hashed, we just leave it on the list

 - otherwise mark it HASHED and insert it into the list

this all means that unhashing and rehashing a name all just works
automatically.  Obviously, you cannot change the name of an entry (that
would be a serious bug), but nothing can validly do that anyway (you'd
have to allocate a new struct cache_entry anyway since the name length
could change), so that's not a new limitation.

The code actually gets simpler in many ways, although the lazy hashing
does mean that there are a few odd cases (ie something can be marked
unhashed even though it was never on the hash in the first place, and
isn't actually marked hashed!).
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

cache.h

@@ -133,7 +133,9 @@ struct cache_entry {
 #define CE_UPDATE    (0x10000)
 #define CE_REMOVE    (0x20000)
 #define CE_UPTODATE  (0x40000)
-#define CE_UNHASHED  (0x80000)
+
+#define CE_HASHED    (0x100000)
+#define CE_UNHASHED  (0x200000)
 
 static inline unsigned create_ce_flags(size_t len, unsigned stage)
 {

read-cache.c

@@ -37,8 +37,13 @@ static unsigned int hash_name(const char *name, int namelen)
 static void hash_index_entry(struct index_state *istate, struct cache_entry *ce)
 {
 	void **pos;
-	unsigned int hash = hash_name(ce->name, ce_namelen(ce));
+	unsigned int hash;
 
+	if (ce->ce_flags & CE_HASHED)
+		return;
+	ce->ce_flags |= CE_HASHED;
+	ce->next = NULL;
+	hash = hash_name(ce->name, ce_namelen(ce));
 	pos = insert_hash(hash, ce, &istate->name_hash);
 	if (pos) {
 		ce->next = *pos;
@@ -59,6 +64,7 @@ static void lazy_init_name_hash(struct index_state *istate)
 
 static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
 {
+	ce->ce_flags &= ~CE_UNHASHED;
 	istate->cache[nr] = ce;
 	if (istate->name_hash_initialized)
 		hash_index_entry(istate, ce);
@@ -82,10 +88,8 @@ static void replace_index_entry(struct index_state *istate, int nr, struct cache
 {
 	struct cache_entry *old = istate->cache[nr];
 
-	if (ce != old) {
-		remove_hash_entry(istate, old);
-		set_index_entry(istate, nr, ce);
-	}
+	remove_hash_entry(istate, old);
+	set_index_entry(istate, nr, ce);
 	istate->cache_changed = 1;
 }