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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/fid/fid_lib.c
33 * Miscellaneous fid functions.
35 * Author: Nikita Danilov <nikita@clusterfs.com>
36 * Author: Yury Umanets <umka@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_FID
41 #include <libcfs/libcfs.h>
42 #include <linux/module.h>
43 #include <lustre_fid.h>
46 * A cluster-wide range from which fid-sequences are granted to servers and
51 * Normal FID: seq:64 [2^33,2^64-1] oid:32 ver:32
52 * IGIF : 0:32, ino:32 gen:32 0:32
53 * IDIF : 0:31, 1:1, ost-index:16, objd:48 0:32
56 * The first 0x400 sequences of normal FID are reserved for special purpose.
57 * FID_SEQ_START + 1 is for local file id generation.
58 * FID_SEQ_START + 2 is for .lustre directory and its objects
60 const struct lu_seq_range LUSTRE_SEQ_SPACE_RANGE = {
61 .lsr_start = FID_SEQ_NORMAL,
62 .lsr_end = (__u64)~0ULL,
65 /* Zero range, used for init and other purposes. */
66 const struct lu_seq_range LUSTRE_SEQ_ZERO_RANGE = {
70 /* Lustre Big Fs Lock fid. */
71 const struct lu_fid LUSTRE_BFL_FID = { .f_seq = FID_SEQ_SPECIAL,
72 .f_oid = FID_OID_SPECIAL_BFL,
73 .f_ver = 0x0000000000000000 };
74 EXPORT_SYMBOL(LUSTRE_BFL_FID);
76 /** Special fid for ".lustre" directory */
77 const struct lu_fid LU_DOT_LUSTRE_FID = { .f_seq = FID_SEQ_DOT_LUSTRE,
78 .f_oid = FID_OID_DOT_LUSTRE,
79 .f_ver = 0x0000000000000000 };
80 EXPORT_SYMBOL(LU_DOT_LUSTRE_FID);
82 /** Special fid for "fid" special object in .lustre */
83 const struct lu_fid LU_OBF_FID = { .f_seq = FID_SEQ_DOT_LUSTRE,
84 .f_oid = FID_OID_DOT_LUSTRE_OBF,
85 .f_ver = 0x0000000000000000 };
86 EXPORT_SYMBOL(LU_OBF_FID);
88 /** Special fid for "lost+found" special object in .lustre */
89 const struct lu_fid LU_LPF_FID = { .f_seq = FID_SEQ_DOT_LUSTRE,
90 .f_oid = FID_OID_DOT_LUSTRE_LPF,
91 .f_ver = 0x0000000000000000 };
92 EXPORT_SYMBOL(LU_LPF_FID);
94 /** "/lost+found" - special FID for ldiskfs backend, invislbe to client. */
95 const struct lu_fid LU_BACKEND_LPF_FID = { .f_seq = FID_SEQ_LOCAL_FILE,
97 .f_ver = 0x0000000000000000 };
98 EXPORT_SYMBOL(LU_BACKEND_LPF_FID);