1 files changed, 67 insertions, 0 deletions
diff --git a/include/linux/nfs.h b/include/linux/nfs.h
new file mode 100644
index 000000000..ceb70a926
--- /dev/null
+++ b/include/linux/nfs.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NFS protocol definitions
+ *
+ * This file contains constants mostly for Version 2 of the protocol,
+ * but also has a couple of NFSv3 bits in (notably the error codes).
+ */
+#ifndef _LINUX_NFS_H
+#define _LINUX_NFS_H
+
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/string.h>
+#include <linux/crc32.h>
+#include <uapi/linux/nfs.h>
+
+/*
+ * This is the kernel NFS client file handle representation
+ */
+#define NFS_MAXFHSIZE		128
+struct nfs_fh {
+	unsigned short		size;
+	unsigned char		data[NFS_MAXFHSIZE];
+};
+
+/*
+ * Returns a zero iff the size and data fields match.
+ * Checks only "size" bytes in the data field.
+ */
+static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
+{
+	return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
+}
+
+static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
+{
+	target->size = source->size;
+	memcpy(target->data, source->data, source->size);
+}
+
+enum nfs3_stable_how {
+	NFS_UNSTABLE = 0,
+	NFS_DATA_SYNC = 1,
+	NFS_FILE_SYNC = 2,
+
+	/* used by direct.c to mark verf as invalid */
+	NFS_INVALID_STABLE_HOW = -1
+};
+
+#ifdef CONFIG_CRC32
+/**
+ * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
+ * @fh - pointer to filehandle
+ *
+ * returns a crc32 hash for the filehandle that is compatible with
+ * the one displayed by "wireshark".
+ */
+static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
+{
+	return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
+}
+#else /* CONFIG_CRC32 */
+static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
+{
+	return 0;
+}
+#endif /* CONFIG_CRC32 */
+#endif /* _LINUX_NFS_H */