diff --git a/Documentation/merge-strategies.txt b/Documentation/merge-strategies.txt
index 7df0266ba8..1276f858ad 100644
--- a/Documentation/merge-strategies.txt
+++ b/Documentation/merge-strategies.txt
@@ -33,3 +33,10 @@ ours::
 	merge is always the current branch head.  It is meant to
 	be used to supersede old development history of side
 	branches.
+
+subtree::
+	This is a modified recursive strategy. When merging trees A and
+	B, if B corresponds to a subtree of A, B is first adjusted to
+	match the tree structure of A, instead of reading the trees at
+	the same level. This adjustment is also done to the common
+	ancestor tree.
diff --git a/builtin-fetch-pack.c b/builtin-fetch-pack.c
index 7b28024224..65350ca522 100644
--- a/builtin-fetch-pack.c
+++ b/builtin-fetch-pack.c
@@ -26,6 +26,8 @@ static const char fetch_pack_usage[] =
 #define SEEN		(1U << 3)
 #define POPPED		(1U << 4)
 
+static int marked;
+
 /*
  * After sending this many "have"s if we do not get any new ACK , we
  * give up traversing our history.
@@ -61,6 +63,16 @@ static int rev_list_insert_ref(const char *path, const unsigned char *sha1, int
 	return 0;
 }
 
+static int clear_marks(const char *path, const unsigned char *sha1, int flag, void *cb_data)
+{
+	struct object *o = deref_tag(parse_object(sha1), path, 0);
+
+	if (o && o->type == OBJ_COMMIT)
+		clear_commit_marks((struct commit *)o,
+				   COMMON | COMMON_REF | SEEN | POPPED);
+	return 0;
+}
+
 /*
    This function marks a rev and its ancestors as common.
    In some cases, it is desirable to mark only the ancestors (for example
@@ -153,6 +165,10 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 	unsigned in_vain = 0;
 	int got_continue = 0;
 
+	if (marked)
+		for_each_ref(clear_marks, NULL);
+	marked = 1;
+
 	for_each_ref(rev_list_insert_ref, NULL);
 
 	fetching = 0;
diff --git a/entry.c b/entry.c
index 44f4b897d4..222aaa374b 100644
--- a/entry.c
+++ b/entry.c
@@ -218,7 +218,6 @@ int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *t
 		 * to emulate by hand - much easier to let the system
 		 * just do the right thing)
 		 */
-		unlink(path);
 		if (S_ISDIR(st.st_mode)) {
 			/* If it is a gitlink, leave it alone! */
 			if (S_ISGITLINK(ce->ce_mode))
@@ -226,7 +225,8 @@ int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *t
 			if (!state->force)
 				return error("%s is a directory", path);
 			remove_subtree(path);
-		}
+		} else if (unlink(path))
+			return error("unable to unlink old '%s' (%s)", path, strerror(errno));
 	} else if (state->not_new)
 		return 0;
 	create_directories(path, state);
diff --git a/git-merge-one-file.sh b/git-merge-one-file.sh
index 9ee3f80452..e1eb963266 100755
--- a/git-merge-one-file.sh
+++ b/git-merge-one-file.sh
@@ -48,10 +48,11 @@ case "${1:-.}${2:-.}${3:-.}" in
 	;;
 "..$3")
 	echo "Adding $4"
-	test -f "$4" || {
+	if test -f "$4"
+	then
 		echo "ERROR: untracked $4 is overwritten by the merge."
 		exit 1
-	}
+	fi
 	git update-index --add --cacheinfo "$7" "$3" "$4" &&
 		exec git checkout-index -u -f -- "$4"
 	;;
diff --git a/remote.c b/remote.c
index f3f7375eea..9700a33c57 100644
--- a/remote.c
+++ b/remote.c
@@ -396,6 +396,7 @@ static void read_config(void)
 struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 {
 	int i;
+	int st;
 	struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 	for (i = 0; i < nr_refspec; i++) {
 		const char *sp, *ep, *gp;
@@ -404,13 +405,15 @@ struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 			rs[i].force = 1;
 			sp++;
 		}
-		gp = strchr(sp, '*');
+		gp = strstr(sp, "/*");
 		ep = strchr(sp, ':');
 		if (gp && ep && gp > ep)
 			gp = NULL;
 		if (ep) {
 			if (ep[1]) {
-				const char *glob = strchr(ep + 1, '*');
+				const char *glob = strstr(ep + 1, "/*");
+				if (glob && glob[2])
+					glob = NULL;
 				if (!glob)
 					gp = NULL;
 				if (gp)
@@ -422,11 +425,24 @@ struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 		} else {
 			ep = sp + strlen(sp);
 		}
+		if (gp && gp + 2 != ep)
+			gp = NULL;
 		if (gp) {
 			rs[i].pattern = 1;
 			ep = gp;
 		}
 		rs[i].src = xstrndup(sp, ep - sp);
+
+		if (*rs[i].src) {
+			st = check_ref_format(rs[i].src);
+			if (st && st != CHECK_REF_FORMAT_ONELEVEL)
+				die("Invalid refspec '%s'", refspec[i]);
+		}
+		if (rs[i].dst && *rs[i].dst) {
+			st = check_ref_format(rs[i].dst);
+			if (st && st != CHECK_REF_FORMAT_ONELEVEL)
+				die("Invalid refspec '%s'", refspec[i]);
+		}
 	}
 	return rs;
 }
@@ -543,7 +559,8 @@ int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 		if (!fetch->dst)
 			continue;
 		if (fetch->pattern) {
-			if (!prefixcmp(needle, key)) {
+			if (!prefixcmp(needle, key) &&
+			    needle[strlen(key)] == '/') {
 				*result = xmalloc(strlen(value) +
 						  strlen(needle) -
 						  strlen(key) + 1);
@@ -790,7 +807,9 @@ static const struct refspec *check_pattern_match(const struct refspec *rs,
 {
 	int i;
 	for (i = 0; i < rs_nr; i++) {
-		if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
+		if (rs[i].pattern &&
+		    !prefixcmp(src->name, rs[i].src) &&
+		    src->name[strlen(rs[i].src)] == '/')
 			return rs + i;
 	}
 	return NULL;
@@ -989,7 +1008,7 @@ int get_fetch_map(const struct ref *remote_refs,
 		  struct ref ***tail,
 		  int missing_ok)
 {
-	struct ref *ref_map, *rm;
+	struct ref *ref_map, **rmp;
 
 	if (refspec->pattern) {
 		ref_map = get_expanded_map(remote_refs, refspec);
@@ -1006,10 +1025,20 @@ int get_fetch_map(const struct ref *remote_refs,
 		}
 	}
 
-	for (rm = ref_map; rm; rm = rm->next) {
-		if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
-			die("* refusing to create funny ref '%s' locally",
-			    rm->peer_ref->name);
+	for (rmp = &ref_map; *rmp; ) {
+		if ((*rmp)->peer_ref) {
+			int st = check_ref_format((*rmp)->peer_ref->name + 5);
+			if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
+				struct ref *ignore = *rmp;
+				error("* Ignoring funny ref '%s' locally",
+				      (*rmp)->peer_ref->name);
+				*rmp = (*rmp)->next;
+				free(ignore->peer_ref);
+				free(ignore);
+				continue;
+			}
+		}
+		rmp = &((*rmp)->next);
 	}
 
 	if (ref_map)
diff --git a/revision.c b/revision.c
index 63bf2c5c2d..196fedc9d1 100644
--- a/revision.c
+++ b/revision.c
@@ -564,14 +564,39 @@ static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
 	free_patch_ids(&ids);
 }
 
-static void add_to_list(struct commit_list **p, struct commit *commit, struct commit_list *n)
+/* How many extra uninteresting commits we want to see.. */
+#define SLOP 5
+
+static int still_interesting(struct commit_list *src, unsigned long date, int slop)
 {
-	p = &commit_list_insert(commit, p)->next;
-	*p = n;
+	/*
+	 * No source list at all? We're definitely done..
+	 */
+	if (!src)
+		return 0;
+
+	/*
+	 * Does the destination list contain entries with a date
+	 * before the source list? Definitely _not_ done.
+	 */
+	if (date < src->item->date)
+		return SLOP;
+
+	/*
+	 * Does the source list still have interesting commits in
+	 * it? Definitely not done..
+	 */
+	if (!everybody_uninteresting(src))
+		return SLOP;
+
+	/* Ok, we're closing in.. */
+	return slop-1;
 }
 
 static int limit_list(struct rev_info *revs)
 {
+	int slop = SLOP;
+	unsigned long date = ~0ul;
 	struct commit_list *list = revs->commits;
 	struct commit_list *newlist = NULL;
 	struct commit_list **p = &newlist;
@@ -591,16 +616,19 @@ static int limit_list(struct rev_info *revs)
 			return -1;
 		if (obj->flags & UNINTERESTING) {
 			mark_parents_uninteresting(commit);
-			if (everybody_uninteresting(list)) {
-				if (revs->show_all)
-					add_to_list(p, commit, list);
-				break;
-			}
-			if (!revs->show_all)
+			if (revs->show_all)
+				p = &commit_list_insert(commit, p)->next;
+			slop = still_interesting(list, date, slop);
+			if (slop)
 				continue;
+			/* If showing all, add the whole pending list to the end */
+			if (revs->show_all)
+				*p = list;
+			break;
 		}
 		if (revs->min_age != -1 && (commit->date > revs->min_age))
 			continue;
+		date = commit->date;
 		p = &commit_list_insert(commit, p)->next;
 
 		show = show_early_output;
diff --git a/t/t1004-read-tree-m-u-wf.sh b/t/t1004-read-tree-m-u-wf.sh
index 9d1371c2c6..570d3729bd 100755
--- a/t/t1004-read-tree-m-u-wf.sh
+++ b/t/t1004-read-tree-m-u-wf.sh
@@ -157,4 +157,85 @@ test_expect_success '3-way not overwriting local changes (their side)' '
 
 '
 
+test_expect_success 'funny symlink in work tree' '
+
+	git reset --hard &&
+	git checkout -b sym-b side-b &&
+	mkdir -p a &&
+	>a/b &&
+	git add a/b &&
+	git commit -m "side adds a/b" &&
+
+	rm -fr a &&
+	git checkout -b sym-a side-a &&
+	mkdir -p a &&
+	ln -s ../b a/b &&
+	git add a/b &&
+	git commit -m "we add a/b" &&
+
+	git read-tree -m -u sym-a sym-a sym-b
+
+'
+
+test_expect_success 'funny symlink in work tree, un-unlink-able' '
+
+	rm -fr a b &&
+	git reset --hard &&
+
+	git checkout sym-a &&
+	chmod a-w a &&
+	test_must_fail git read-tree -m -u sym-a sym-a sym-b
+
+'
+
+# clean-up from the above test
+chmod a+w a
+rm -fr a b
+
+test_expect_success 'D/F setup' '
+
+	git reset --hard &&
+
+	git checkout side-a &&
+	rm -f subdir/file2 &&
+	mkdir subdir/file2 &&
+	echo qfwfq >subdir/file2/another &&
+	git add subdir/file2/another &&
+	test_tick &&
+	git commit -m "side-a changes file2 to directory"
+
+'
+
+test_expect_success 'D/F' '
+
+	git checkout side-b &&
+	git read-tree -m -u branch-point side-b side-a &&
+	git ls-files -u >actual &&
+	(
+		a=$(git rev-parse branch-point:subdir/file2)
+		b=$(git rev-parse side-a:subdir/file2/another)
+		echo "100644 $a 1	subdir/file2"
+		echo "100644 $a 2	subdir/file2"
+		echo "100644 $b 3	subdir/file2/another"
+	) >expect &&
+	test_cmp actual expect
+
+'
+
+test_expect_success 'D/F resolve' '
+
+	git reset --hard &&
+	git checkout side-b &&
+	git merge-resolve branch-point -- side-b side-a
+
+'
+
+test_expect_success 'D/F recursive' '
+
+	git reset --hard &&
+	git checkout side-b &&
+	git merge-recursive branch-point -- side-b side-a
+
+'
+
 test_done
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 38e91809bf..f068f1957f 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -155,16 +155,6 @@ test_expect_success 'test tracking setup via config' \
      test $(git config branch.my3.remote) = local &&
      test $(git config branch.my3.merge) = refs/heads/master'
 
-test_expect_success 'avoid ambiguous track' '
-	git config branch.autosetupmerge true &&
-	git config remote.ambi1.url = lalala &&
-	git config remote.ambi1.fetch = refs/heads/lalala:refs/heads/master &&
-	git config remote.ambi2.url = lilili &&
-	git config remote.ambi2.fetch = refs/heads/lilili:refs/heads/master &&
-	git branch all1 master &&
-	test -z "$(git config branch.all1.merge)"
-'
-
 test_expect_success 'test overriding tracking setup via --no-track' \
     'git config branch.autosetupmerge true &&
      git config remote.local.url . &&
@@ -226,4 +216,14 @@ test_expect_success \
 	 test -f .git/logs/refs/heads/g/h/i &&
 	 diff expect .git/logs/refs/heads/g/h/i'
 
+test_expect_success 'avoid ambiguous track' '
+	git config branch.autosetupmerge true &&
+	git config remote.ambi1.url lalala &&
+	git config remote.ambi1.fetch refs/heads/lalala:refs/heads/master &&
+	git config remote.ambi2.url lilili &&
+	git config remote.ambi2.fetch refs/heads/lilili:refs/heads/master &&
+	git branch all1 master &&
+	test -z "$(git config branch.all1.merge)"
+'
+
 test_done
diff --git a/t/t6009-rev-list-parent.sh b/t/t6009-rev-list-parent.sh
index f248a3293c..c8a96a9a99 100755
--- a/t/t6009-rev-list-parent.sh
+++ b/t/t6009-rev-list-parent.sh
@@ -27,7 +27,7 @@ test_expect_success setup '
 	git log --pretty=oneline --abbrev-commit
 '
 
-test_expect_failure 'one is ancestor of others and should not be shown' '
+test_expect_success 'one is ancestor of others and should not be shown' '
 
 	git rev-list one --not four >result &&
 	>expect &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 0815190a2f..b23f8fd847 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -396,7 +396,12 @@ fi
 
 # Test repository
 test=trash
-rm -fr "$test"
+rm -fr "$test" || {
+	trap - exit
+	echo >&5 "FATAL: Cannot prepare test area"
+	exit 1
+}
+
 test_create_repo $test
 cd "$test"
 
diff --git a/unpack-trees.c b/unpack-trees.c
index 4b359e0832..a59f47557a 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -54,13 +54,14 @@ static void unlink_entry(char *name, char *last_symlink)
 }
 
 static struct checkout state;
-static void check_updates(struct unpack_trees_options *o)
+static int check_updates(struct unpack_trees_options *o)
 {
 	unsigned cnt = 0, total = 0;
 	struct progress *progress = NULL;
 	char last_symlink[PATH_MAX];
 	struct index_state *index = &o->result;
 	int i;
+	int errs = 0;
 
 	if (o->update && o->verbose_update) {
 		for (total = cnt = 0; cnt < index->cache_nr; cnt++) {
@@ -90,12 +91,13 @@ static void check_updates(struct unpack_trees_options *o)
 		if (ce->ce_flags & CE_UPDATE) {
 			ce->ce_flags &= ~CE_UPDATE;
 			if (o->update) {
-				checkout_entry(ce, &state, NULL);
+				errs |= checkout_entry(ce, &state, NULL);
 				*last_symlink = '\0';
 			}
 		}
 	}
 	stop_progress(&progress);
+	return errs != 0;
 }
 
 static inline int call_unpack_fn(struct cache_entry **src, struct unpack_trees_options *o)
@@ -369,7 +371,8 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 		return unpack_failed(o, "Merge requires file-level merging");
 
 	o->src_index = NULL;
-	check_updates(o);
+	if (check_updates(o))
+		return -1;
 	if (o->dst_index)
 		*o->dst_index = o->result;
 	return 0;