nfs: Add MOUNTv3 protocol support

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 399 (NFS translator with Mount v3 and NFS v3 support)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=399

1 files changed, 105 insertions, 0 deletions

diff --git a/xlators/nfs/server/src/nfs3-fh.h b/xlators/nfs/server/src/nfs3-fh.h
new file mode 100644
index 000000000..f526edf43
--- /dev/null
+++ b/xlators/nfs/server/src/nfs3-fh.h
@@ -0,0 +1,105 @@
+/*
+  Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _NFS_FH_H_
+#define _NFS_FH_H_
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "xdr-nfs3.h"
+#include "iatt.h"
+#include <sys/types.h>
+
+/* BIG FAT WARNING: The file handle code is tightly coupled to NFSv3 file
+ * handles for now. This will change if and when we need v4. */
+#define GF_NFSFH_IDENT0         ':'
+#define GF_NFSFH_IDENT1         'O'
+#define GF_NFSFH_IDENT_SIZE     (sizeof(char) * 2)
+#define GF_NFSFH_STATIC_SIZE    (GF_NFSFH_IDENT_SIZE + sizeof (uint16_t) + sizeof (uint16_t) + sizeof (uint64_t) + sizeof(uint64_t))
+#define GF_NFSFH_MAX_HASH_BYTES (NFS3_FHSIZE - GF_NFSFH_STATIC_SIZE)
+
+/* Each hash element in the file handle is of 2 bytes thus giving
+ * us theoretically 65536 unique entries in a directory.
+ */
+typedef uint16_t                nfs3_hash_entry_t;
+#define GF_NFSFH_ENTRYHASH_SIZE (sizeof (nfs3_hash_entry_t))
+#define GF_NFSFH_MAXHASHES      ((int)(GF_NFSFH_MAX_HASH_BYTES / GF_NFSFH_ENTRYHASH_SIZE))
+
+/* ATTENTION: Change in size of the structure below should be reflected in the
+ * GF_NFSFH_STATIC_SIZE.
+ */
+struct nfs3_fh {
+
+        /* Used to ensure that a bunch of bytes are actually a GlusterFS NFS
+         * file handle. Should contain ":O"
+         */
+        char                    ident[2];
+
+        /* Number of file/ino hash elements that follow the ino. */
+        uint16_t                hashcount;
+
+        /* Basically, the position/index of an xlator among the children of
+         * the NFS xlator.
+         */
+        uint16_t                xlatorid;
+        uint64_t                gen;
+        uint64_t                ino;
+        nfs3_hash_entry_t       entryhash[GF_NFSFH_MAXHASHES];
+} __attribute__((__packed__));
+
+
+extern uint32_t
+nfs3_fh_compute_size (struct nfs3_fh *fh);
+
+extern int
+nfs3_fh_hash_index_is_beyond (struct nfs3_fh *fh, int hashidx);
+
+extern uint16_t
+nfs3_fh_hash_entry (ino_t ino, uint64_t gen);
+
+extern int
+nfs3_fh_validate (struct nfs3_fh *fh);
+
+extern xlator_t *
+nfs3_fh_to_xlator (xlator_list_t *cl, struct nfs3_fh *fh);
+
+extern struct nfs3_fh
+nfs3_fh_build_root_fh (xlator_list_t *cl, xlator_t *xl, struct iatt buf);
+
+extern int
+nfs3_fh_is_root_fh (struct nfs3_fh *fh);
+
+extern int
+nfs3_fh_build_child_fh (struct nfs3_fh *parent, struct iatt *newstat,
+                        struct nfs3_fh *newfh);
+
+extern void
+nfs3_log_fh (struct nfs3_fh *fh);
+
+extern void
+nfs3_fh_to_str (struct nfs3_fh *fh, char *str);
+
+extern int
+nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat,
+                         struct nfs3_fh *newfh);
+#endif