X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fobdclass%2Fmea.c;h=1082cbcb64035569c5fba0170733fc0bc500106c;hb=44cc42f556c668de09479f706beea4b6e600eb4b;hp=56fc149ee55a49a49c93864b8c150606a00aa987;hpb=e2d42b61949a4ffc08a3a8245f0572543350bd2c;p=fs%2Flustre-release.git

diff --git a/lustre/obdclass/mea.c b/lustre/obdclass/mea.c
index 56fc149..1082cbc 100644
--- a/lustre/obdclass/mea.c
+++ b/lustre/obdclass/mea.c
@@ -1,72 +1,108 @@
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
  *
- * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
- *   This file is part of Lustre, http://www.lustre.org.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
  *
- *   Lustre is free software; you can redistribute it and/or
- *   modify it under the terms of version 2 of the GNU General Public
- *   License as published by the Free Software Foundation.
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
  *
- *   Lustre 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
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Lustre; if not, write to the Free Software
- *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
  */
 
 #define DEBUG_SUBSYSTEM S_CLASS
+#include <obd_class.h>
 #ifdef __KERNEL__
 #include <linux/kmod.h>   /* for request_module() */
 #include <linux/module.h>
-#include <linux/obd_class.h>
-#include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
-#else 
+#else
 #include <liblustre.h>
-#include <linux/obd_class.h>
-#include <linux/obd.h>
+#include <obd.h>
 #endif
-#include <linux/lprocfs_status.h>
+#include <lprocfs_status.h>
+#include <lustre/lustre_idl.h>
 
-
-int mea_name2idx(struct mea *mea, char *name, int namelen)
+static int mea_last_char_hash(int count, char *name, int namelen)
 {
         unsigned int c;
 
-	/* just to simplify caller code */
-       	if (mea == NULL)
-		return 0;
+        c = name[namelen - 1];
+        if (c == 0)
+                CWARN("looks like wrong len is passed\n");
+        c = c % count;
+        return c;
+}
 
-        if (mea->mea_count == 0)
-                return 0;
+static int mea_all_chars_hash(int count, char *name, int namelen)
+{
+        unsigned int c = 0;
 
-        /* FIXME: real hash calculation here */
-        c = name[namelen - 1];
-        c = c % mea->mea_count;
-	
-	LASSERT(c < mea->mea_count);
+        while (--namelen >= 0)
+                c += name[namelen];
+        c = c % count;
         return c;
 }
 
-int raw_name2idx(int count, const char *name, int namelen)
+int raw_name2idx(int hashtype, int count, const char *name, int namelen)
 {
-        unsigned int c;
+        unsigned int c = 0;
 
         LASSERT(namelen > 0);
         if (count <= 1)
                 return 0;
 
+        switch (hashtype) {
+                case MEA_MAGIC_LAST_CHAR:
+                        c = mea_last_char_hash(count, (char *)name, namelen);
+                        break;
+                case MEA_MAGIC_ALL_CHARS:
+                        c = mea_all_chars_hash(count, (char *)name, namelen);
+                        break;
+                case MEA_MAGIC_HASH_SEGMENT:
+                        CERROR("Unsupported hash type MEA_MAGIC_HASH_SEGMENT\n");
+                        break;
+                default:
+                        CERROR("Unknown hash type 0x%x\n", hashtype);
+        }
 
-        /* FIXME: real hash calculation here */
-        c = name[namelen - 1];
-        c = c % count;
-	
+        LASSERT(c < count);
         return c;
 }
+EXPORT_SYMBOL(raw_name2idx);
 
+int mea_name2idx(struct lmv_stripe_md *mea, const char *name, int namelen)
+{
+        unsigned int c;
+
+        LASSERT(mea && mea->mea_count);
+
+	c = raw_name2idx(mea->mea_magic, mea->mea_count, name, namelen);
+
+        LASSERT(c < mea->mea_count);
+        return c;
+}
+EXPORT_SYMBOL(mea_name2idx);