1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_CLASS
38 #include <obd_class.h>
40 #include <linux/kmod.h> /* for request_module() */
41 #include <linux/module.h>
42 #include <linux/slab.h>
43 #include <linux/pagemap.h>
45 #include <liblustre.h>
48 #include <lprocfs_status.h>
49 #include <lustre/lustre_idl.h>
51 static int mea_last_char_hash(int count, char *name, int namelen)
55 c = name[namelen - 1];
57 CWARN("looks like wrong len is passed\n");
62 static int mea_all_chars_hash(int count, char *name, int namelen)
66 while (--namelen >= 0)
72 int raw_name2idx(int hashtype, int count, const char *name, int namelen)
81 case MEA_MAGIC_LAST_CHAR:
82 c = mea_last_char_hash(count, (char *)name, namelen);
84 case MEA_MAGIC_ALL_CHARS:
85 c = mea_all_chars_hash(count, (char *)name, namelen);
87 case MEA_MAGIC_HASH_SEGMENT:
88 CERROR("Unsupported hash type MEA_MAGIC_HASH_SEGMENT\n");
91 CERROR("Unknown hash type 0x%x\n", hashtype);
98 int mea_name2idx(struct lmv_stripe_md *mea, const char *name, int namelen)
102 LASSERT(mea && mea->mea_count);
104 c = raw_name2idx(mea->mea_magic, mea->mea_count, name, namelen);
106 LASSERT(c < mea->mea_count);