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, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 static inline int lov_stripe_md_size(__u16 stripes)
42 return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
45 static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
47 if (lmm_magic == LOV_MAGIC_V3)
48 return sizeof(struct lov_mds_md_v3) +
49 stripes * sizeof(struct lov_ost_data_v1);
51 return sizeof(struct lov_mds_md_v1) +
52 stripes * sizeof(struct lov_ost_data_v1);
55 struct lov_version_size {
61 static inline __u32 lov_mds_md_stripecnt(int ea_size, __u32 lmm_magic)
63 static const struct lov_version_size lmm_ver_size[] = {
64 { .lvs_magic = LOV_MAGIC_V3,
65 .lvs_lmm_size = sizeof(struct lov_mds_md_v3),
66 .lvs_lod_size = sizeof(struct lov_ost_data_v1) },
67 { .lvs_magic = LOV_MAGIC_V1,
68 .lvs_lmm_size = sizeof(struct lov_mds_md_v1),
69 .lvs_lod_size = sizeof(struct lov_ost_data_v1)} };
72 for (i = 0; i < ARRAY_SIZE(lmm_ver_size); i++) {
73 if (lmm_magic == lmm_ver_size[i].lvs_magic) {
74 if (ea_size <= lmm_ver_size[i].lvs_lmm_size)
76 return (ea_size - lmm_ver_size[i].lvs_lmm_size) /
77 lmm_ver_size[i].lvs_lod_size;
81 /* Invalid LOV magic, so no stripes could fit */
85 /* lov_do_div64(a, b) returns a % b, and a = a / b.
86 * The 32-bit code is LOV-specific due to knowing about stripe limits in
87 * order to reduce the divisor to a 32-bit number. If the divisor is
88 * already a 32-bit value the compiler handles this directly. */
89 #if BITS_PER_LONG > 32
90 # define lov_do_div64(n,base) ({ \
91 uint64_t __base = (base); \
93 __rem = ((uint64_t)(n)) % __base; \
94 (n) = ((uint64_t)(n)) / __base; \
98 # define lov_do_div64(n,base) ({ \
100 if ((sizeof(base) > 4) && (((base) & 0xffffffff00000000ULL) != 0)) { \
102 LASSERTF(!((base) & (LOV_MIN_STRIPE_SIZE - 1)), "64 bit lov " \
103 "division %llu / %llu\n", (n), (uint64_t)(base)); \
104 __remainder = (n) & (LOV_MIN_STRIPE_SIZE - 1); \
105 (n) >>= LOV_MIN_STRIPE_BITS; \
106 __rem = do_div(n, (base) >> LOV_MIN_STRIPE_BITS); \
107 __rem <<= LOV_MIN_STRIPE_BITS; \
108 __rem += __remainder; \
110 __rem = do_div(n, base); \
116 #define IOC_LOV_TYPE 'g'
117 #define IOC_LOV_MIN_NR 50
118 #define IOC_LOV_SET_OSC_ACTIVE _IOWR('g', 50, long)
119 #define IOC_LOV_MAX_NR 50
121 #define QOS_DEFAULT_THRESHOLD 10 /* MB */
122 #define QOS_DEFAULT_MAXAGE 5 /* Seconds */