1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index c0a2ca97c72f..bd07758943e0 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -47,6 +47,27 @@ struct dentry_stat_t {
 };
 extern struct dentry_stat_t dentry_stat;
 
+/*
+ * Compare 2 name strings, return 0 if they match, otherwise non-zero.
+ * The strings are both count bytes long, and count is non-zero.
+ */
+static inline int dentry_cmp(const unsigned char *cs, size_t scount,
+                                const unsigned char *ct, size_t tcount)
+{
+        int ret;
+        if (scount != tcount)
+                return 1;
+        do {
+                ret = (*cs != *ct);
+                if (ret)
+                        break;
+                cs++;
+                ct++;
+                tcount--;
+        } while (tcount);
+        return ret;
+}
+
 /* Name hashing routines. Initial hash value */
 /* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
 #define init_name_hash()                0