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-rw-r--r--fs/ubifs/key.h32
1 files changed, 18 insertions, 14 deletions
diff --git a/fs/ubifs/key.h b/fs/ubifs/key.h
index 3f1f16b..efb3430 100644
--- a/fs/ubifs/key.h
+++ b/fs/ubifs/key.h
@@ -38,6 +38,22 @@
#define __UBIFS_KEY_H__
/**
+ * key_mask_hash - mask a valid hash value.
+ * @val: value to be masked
+ *
+ * We use hash values as offset in directories, so values %0 and %1 are
+ * reserved for "." and "..". %2 is reserved for "end of readdir" marker. This
+ * function makes sure the reserved values are not used.
+ */
+static inline uint32_t key_mask_hash(uint32_t hash)
+{
+ hash &= UBIFS_S_KEY_HASH_MASK;
+ if (unlikely(hash <= 2))
+ hash += 3;
+ return hash;
+}
+
+/**
* key_r5_hash - R5 hash function (borrowed from reiserfs).
* @s: direntry name
* @len: name length
@@ -54,16 +70,7 @@ static inline uint32_t key_r5_hash(const char *s, int len)
str++;
}
- a &= UBIFS_S_KEY_HASH_MASK;
-
- /*
- * We use hash values as offset in directories, so values %0 and %1 are
- * reserved for "." and "..". %2 is reserved for "end of readdir"
- * marker.
- */
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
@@ -77,10 +84,7 @@ static inline uint32_t key_test_hash(const char *str, int len)
len = min_t(uint32_t, len, 4);
memcpy(&a, str, len);
- a &= UBIFS_S_KEY_HASH_MASK;
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
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