btrfs-progs: move btrfs_extref_hash() to hash.h

Move btrfs_extref_hash() from inode-item.c to hash.h,
so that the function can be called elsewhere.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/hash.h b/hash.h
index ac4c4117..9ff67613 100644
--- a/hash.h
+++ b/hash.h
@@ -25,4 +25,14 @@ static inline u64 btrfs_name_hash(const char *name, int len)
 {
 	return crc32c((u32)~1, name, len);
 }
+
+/*
+ * Figure the key offset of an extended inode ref
+ */
+static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
+				    int len)
+{
+	return (u64)btrfs_crc32c(parent_objectid, name, len);
+}
+
 #endif