4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
35 #define DEBUG_SUBSYSTEM S_CLASS
36 #include <obd_class.h>
38 #include <linux/kmod.h> /* for request_module() */
39 #include <linux/module.h>
40 #include <linux/slab.h>
41 #include <linux/pagemap.h>
43 #include <liblustre.h>
46 #include <lprocfs_status.h>
47 #include <lustre/lustre_idl.h>
49 static int mea_last_char_hash(int count, char *name, int namelen)
53 c = name[namelen - 1];
55 CWARN("looks like wrong len is passed\n");
60 static int mea_all_chars_hash(int count, char *name, int namelen)
64 while (--namelen >= 0)
70 int raw_name2idx(int hashtype, int count, const char *name, int namelen)
79 case MEA_MAGIC_LAST_CHAR:
80 c = mea_last_char_hash(count, (char *)name, namelen);
82 case MEA_MAGIC_ALL_CHARS:
83 c = mea_all_chars_hash(count, (char *)name, namelen);
85 case MEA_MAGIC_HASH_SEGMENT:
86 CERROR("Unsupported hash type MEA_MAGIC_HASH_SEGMENT\n");
89 CERROR("Unknown hash type 0x%x\n", hashtype);
96 int mea_name2idx(struct lmv_stripe_md *mea, const char *name, int namelen)
100 LASSERT(mea && mea->mea_count);
102 c = raw_name2idx(mea->mea_magic, mea->mea_count, name, namelen);
104 LASSERT(c < mea->mea_count);