1 files changed, 122 insertions, 0 deletions

diff --git a/include/uapi/linux/nfsd/nfsfh.h b/include/uapi/linux/nfsd/nfsfh.h
new file mode 100644
index 000000000000..616e3b396476
--- /dev/null
+++ b/include/uapi/linux/nfsd/nfsfh.h
@@ -0,0 +1,122 @@
+/*
+ * include/linux/nfsd/nfsfh.h
+ *
+ * This file describes the layout of the file handles as passed
+ * over the wire.
+ *
+ * Earlier versions of knfsd used to sign file handles using keyed MD5
+ * or SHA. I've removed this code, because it doesn't give you more
+ * security than blocking external access to port 2049 on your firewall.
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _UAPI_LINUX_NFSD_FH_H
+#define _UAPI_LINUX_NFSD_FH_H
+
+#include <linux/types.h>
+#include <linux/nfs.h>
+#include <linux/nfs2.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+
+/*
+ * This is the old "dentry style" Linux NFSv2 file handle.
+ *
+ * The xino and xdev fields are currently used to transport the
+ * ino/dev of the exported inode.
+ */
+struct nfs_fhbase_old {
+        __u32           fb_dcookie;     /* dentry cookie - always 0xfeebbaca */
+        __u32           fb_ino;         /* our inode number */
+        __u32           fb_dirino;      /* dir inode number, 0 for directories */
+        __u32           fb_dev;         /* our device */
+        __u32           fb_xdev;
+        __u32           fb_xino;
+        __u32           fb_generation;
+};
+
+/*
+ * This is the new flexible, extensible style NFSv2/v3 file handle.
+ * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
+ *
+ * The file handle starts with a sequence of four-byte words.
+ * The first word contains a version number (1) and three descriptor bytes
+ * that tell how the remaining 3 variable length fields should be handled.
+ * These three bytes are auth_type, fsid_type and fileid_type.
+ *
+ * All four-byte values are in host-byte-order.
+ *
+ * The auth_type field specifies how the filehandle can be authenticated
+ * This might allow a file to be confirmed to be in a writable part of a
+ * filetree without checking the path from it up to the root.
+ * Current values:
+ *     0  - No authentication.  fb_auth is 0 bytes long
+ * Possible future values:
+ *     1  - 4 bytes taken from MD5 hash of the remainer of the file handle
+ *          prefixed by a secret and with the important export flags.
+ *
+ * The fsid_type identifies how the filesystem (or export point) is
+ *    encoded.
+ *  Current values:
+ *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
+ *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
+ *              says we mustn't.  We must break it up and reassemble.
+ *     1  - 4 byte user specified identifier
+ *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
+ *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
+ *     4  - 4 byte inode number and 4 byte uuid
+ *     5  - 8 byte uuid
+ *     6  - 16 byte uuid
+ *     7  - 8 byte inode number and 16 byte uuid
+ *
+ * The fileid_type identified how the file within the filesystem is encoded.
+ * This is (will be) passed to, and set by, the underlying filesystem if it supports
+ * filehandle operations.  The filesystem must not use the value '0' or '0xff' and may
+ * only use the values 1 and 2 as defined below:
+ *  Current values:
+ *    0   - The root, or export point, of the filesystem.  fb_fileid is 0 bytes.
+ *    1   - 32bit inode number, 32 bit generation number.
+ *    2   - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
+ *
+ */
+struct nfs_fhbase_new {
+        __u8            fb_version;     /* == 1, even => nfs_fhbase_old */
+        __u8            fb_auth_type;
+        __u8            fb_fsid_type;
+        __u8            fb_fileid_type;
+        __u32           fb_auth[1];
+/*      __u32           fb_fsid[0]; floating */
+/*      __u32           fb_fileid[0]; floating */
+};
+
+struct knfsd_fh {
+        unsigned int    fh_size;        /* significant for NFSv3.
+                                         * Points to the current size while building
+                                         * a new file handle
+                                         */
+        union {
+                struct nfs_fhbase_old   fh_old;
+                __u32                   fh_pad[NFS4_FHSIZE/4];
+                struct nfs_fhbase_new   fh_new;
+        } fh_base;
+};
+
+#define ofh_dcookie             fh_base.fh_old.fb_dcookie
+#define ofh_ino                 fh_base.fh_old.fb_ino
+#define ofh_dirino              fh_base.fh_old.fb_dirino
+#define ofh_dev                 fh_base.fh_old.fb_dev
+#define ofh_xdev                fh_base.fh_old.fb_xdev
+#define ofh_xino                fh_base.fh_old.fb_xino
+#define ofh_generation          fh_base.fh_old.fb_generation
+
+#define fh_version              fh_base.fh_new.fb_version
+#define fh_fsid_type            fh_base.fh_new.fb_fsid_type
+#define fh_auth_type            fh_base.fh_new.fb_auth_type
+#define fh_fileid_type          fh_base.fh_new.fb_fileid_type
+#define fh_auth                 fh_base.fh_new.fb_auth
+#define fh_fsid                 fh_base.fh_new.fb_auth
+
+
+
+#endif /* _UAPI_LINUX_NFSD_FH_H */