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) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 #define LOV_DEFAULT_STRIPE_SIZE (1 << LNET_MTU_BITS)
42 static inline int lov_stripe_md_size(__u16 stripes)
44 return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
47 struct lov_version_size {
53 static inline __u32 lov_mds_md_stripecnt(int ea_size, __u32 lmm_magic)
55 static const struct lov_version_size lmm_ver_size[] = {
56 { .lvs_magic = LOV_MAGIC_V3,
57 .lvs_lmm_size = sizeof(struct lov_mds_md_v3),
58 .lvs_lod_size = sizeof(struct lov_ost_data_v1) },
59 { .lvs_magic = LOV_MAGIC_V1,
60 .lvs_lmm_size = sizeof(struct lov_mds_md_v1),
61 .lvs_lod_size = sizeof(struct lov_ost_data_v1)} };
64 for (i = 0; i < ARRAY_SIZE(lmm_ver_size); i++) {
65 if (lmm_magic == lmm_ver_size[i].lvs_magic) {
66 if (ea_size <= lmm_ver_size[i].lvs_lmm_size)
68 return (ea_size - lmm_ver_size[i].lvs_lmm_size) /
69 lmm_ver_size[i].lvs_lod_size;
73 /* Invalid LOV magic, so no stripes could fit */
77 /* lov_do_div64(a, b) returns a % b, and a = a / b.
78 * The 32-bit code is LOV-specific due to knowing about stripe limits in
79 * order to reduce the divisor to a 32-bit number. If the divisor is
80 * already a 32-bit value the compiler handles this directly. */
81 #if BITS_PER_LONG > 32
82 # define lov_do_div64(n,base) ({ \
83 uint64_t __base = (base); \
85 __rem = ((uint64_t)(n)) % __base; \
86 (n) = ((uint64_t)(n)) / __base; \
90 # define lov_do_div64(n,base) ({ \
92 if ((sizeof(base) > 4) && (((base) & 0xffffffff00000000ULL) != 0)) { \
94 LASSERTF(!((base) & (LOV_MIN_STRIPE_SIZE - 1)), "64 bit lov " \
95 "division %llu / %llu\n", (n), (uint64_t)(base)); \
96 __remainder = (n) & (LOV_MIN_STRIPE_SIZE - 1); \
97 (n) >>= LOV_MIN_STRIPE_BITS; \
98 __rem = do_div(n, (base) >> LOV_MIN_STRIPE_BITS); \
99 __rem <<= LOV_MIN_STRIPE_BITS; \
100 __rem += __remainder; \
102 __rem = do_div(n, base); \
108 #define IOC_LOV_TYPE 'g'
109 #define IOC_LOV_MIN_NR 50
110 #define IOC_LOV_SET_OSC_ACTIVE _IOWR('g', 50, long)
111 #define IOC_LOV_MAX_NR 50
113 #define QOS_DEFAULT_THRESHOLD 10 /* MB */
114 #define QOS_DEFAULT_MAXAGE 5 /* Seconds */