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 2008 Sun Microsystems, Inc. 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.
36 * lustre/fid/fid_lib.c
38 * Miscellaneous fid functions.
40 * Author: Nikita Danilov <nikita@clusterfs.com>
41 * Author: Yury Umanets <umka@clusterfs.com>
45 # define EXPORT_SYMTAB
47 #define DEBUG_SUBSYSTEM S_FID
50 # include <libcfs/libcfs.h>
51 # include <linux/module.h>
52 #else /* __KERNEL__ */
53 # include <liblustre.h>
57 #include <lu_object.h>
58 #include <lustre_fid.h>
61 * A cluster-wide range from which fid-sequences are granted to servers and
66 * Normal FID: seq:64 [2^33,2^64-1] oid:32 ver:32
67 * IGIF : 0:32, ino:32 gen:32 0:32
68 * IDIF : 0:31, 1:1, ost-index:16, objd:48 0:32
71 * The first 0x400 sequences of normal FID are reserved for special purpose.
73 const struct lu_range LUSTRE_SEQ_SPACE_RANGE = {
74 FID_SEQ_START + 0x400ULL,
77 EXPORT_SYMBOL(LUSTRE_SEQ_SPACE_RANGE);
79 /* Zero range, used for init and other purposes. */
80 const struct lu_range LUSTRE_SEQ_ZERO_RANGE = {
84 EXPORT_SYMBOL(LUSTRE_SEQ_ZERO_RANGE);
86 /* Lustre Big Fs Lock fid. */
87 const struct lu_fid LUSTRE_BFL_FID = { .f_seq = 0x0000000000000003,
88 .f_oid = 0x0000000000000001,
89 .f_ver = 0x0000000000000000 };
90 EXPORT_SYMBOL(LUSTRE_BFL_FID);
92 void range_cpu_to_le(struct lu_range *dst, const struct lu_range *src)
94 /* check that all fields are converted */
95 CLASSERT(sizeof(*src) ==
96 sizeof(src->lr_start) +
98 sizeof(src->lr_padding));
99 dst->lr_start = cpu_to_le64(src->lr_start);
100 dst->lr_end = cpu_to_le64(src->lr_end);
102 EXPORT_SYMBOL(range_cpu_to_le);
104 void range_le_to_cpu(struct lu_range *dst, const struct lu_range *src)
106 /* check that all fields are converted */
107 CLASSERT(sizeof(*src) ==
108 sizeof(src->lr_start) +
109 sizeof(src->lr_end) +
110 sizeof(src->lr_padding));
111 dst->lr_start = le64_to_cpu(src->lr_start);
112 dst->lr_end = le64_to_cpu(src->lr_end);
114 EXPORT_SYMBOL(range_le_to_cpu);
117 void range_cpu_to_be(struct lu_range *dst, const struct lu_range *src)
119 /* check that all fields are converted */
120 CLASSERT(sizeof(*src) ==
121 sizeof(src->lr_start) +
122 sizeof(src->lr_end) +
123 sizeof(src->lr_padding));
124 dst->lr_start = cpu_to_be64(src->lr_start);
125 dst->lr_end = cpu_to_be64(src->lr_end);
127 EXPORT_SYMBOL(range_cpu_to_be);
129 void range_be_to_cpu(struct lu_range *dst, const struct lu_range *src)
131 /* check that all fields are converted */
132 CLASSERT(sizeof(*src) ==
133 sizeof(src->lr_start) +
134 sizeof(src->lr_end) +
135 sizeof(src->lr_padding));
136 dst->lr_start = be64_to_cpu(src->lr_start);
137 dst->lr_end = be64_to_cpu(src->lr_end);
139 EXPORT_SYMBOL(range_be_to_cpu);