A review of notmuch-new.c shows three uses of ->d_type:

Near line 153, in _entries_resemble_maildir() we can simply allow for
DT_UNKNOWN. This would fail if people have MH-style folders which have
three folders called "new" "cur" and "tmp", but that seems unlikely, in
which case the "tmp" folder would simply not be scanned.

Near line 273 in add_files_recursive() we have another check. If
DT_UNKNOWN, we fall through, then add_files_recursive() does a stat
almost immediately, returning with success if the path isn't a

Thus, the fallback is already written.

Finally, near line 343, in add_files_recursive() (a long function) we
have another check. Here we can simply treat DT_UNKNOWN as DT_LNK, since
the logic for the stat() results are the same.

Attached is a patch which was tested with reiserfs. It should also work
with xfs.

diff --git a/notmuch-new.c b/notmuch-new.c
index b740ee2..3e6b96a 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -153,7 +153,7 @@ _entries_resemble_maildir (struct dirent **entries, int count)
     int i, found = 0;
     for (i = 0; i < count; i++) {
-	if (entries[i]->d_type != DT_DIR)
+	if (entries[i]->d_type != DT_DIR && entries[i]->d_type != DT_UNKNOWN)
 	if (strcmp(entries[i]->d_name, "new") == 0 ||
@@ -273,7 +273,8 @@ add_files_recursive (notmuch_database_t *notmuch,
 	entry = fs_entries[i];
-	if (entry->d_type != DT_DIR && entry->d_type != DT_LNK)
+	if (entry->d_type != DT_DIR && entry->d_type != DT_LNK
+			&& entry->d_type != DT_UNKNOWN)
 	/* Ignore special directories to avoid infinite recursion.
@@ -343,7 +344,7 @@ add_files_recursive (notmuch_database_t *notmuch,
 	/* If we're looking at a symlink, we only want to add it if it
 	 * links to a regular file, (and not to a directory, say). */
-	if (entry->d_type == DT_LNK) {
+	if (entry->d_type == DT_LNK || entry->d_type == DT_UNKNOWN) {
 	    int err;
 	    next = talloc_asprintf (notmuch, "%s/%s", path, entry->d_name);
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