diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/fid/fid_lib.c')
-rw-r--r-- | drivers/staging/lustre/lustre/fid/fid_lib.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/fid/fid_lib.c b/drivers/staging/lustre/lustre/fid/fid_lib.c new file mode 100644 index 000000000000..eaff51a555fb --- /dev/null +++ b/drivers/staging/lustre/lustre/fid/fid_lib.c @@ -0,0 +1,97 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/fid/fid_lib.c + * + * Miscellaneous fid functions. + * + * Author: Nikita Danilov <nikita@clusterfs.com> + * Author: Yury Umanets <umka@clusterfs.com> + */ + +#define DEBUG_SUBSYSTEM S_FID + +# include <linux/libcfs/libcfs.h> +# include <linux/module.h> + +#include <obd.h> +#include <lu_object.h> +#include <lustre_fid.h> + +/** + * A cluster-wide range from which fid-sequences are granted to servers and + * then clients. + * + * Fid namespace: + * <pre> + * Normal FID: seq:64 [2^33,2^64-1] oid:32 ver:32 + * IGIF : 0:32, ino:32 gen:32 0:32 + * IDIF : 0:31, 1:1, ost-index:16, objd:48 0:32 + * </pre> + * + * The first 0x400 sequences of normal FID are reserved for special purpose. + * FID_SEQ_START + 1 is for local file id generation. + * FID_SEQ_START + 2 is for .lustre directory and its objects + */ +const struct lu_seq_range LUSTRE_SEQ_SPACE_RANGE = { + FID_SEQ_NORMAL, + (__u64)~0ULL +}; +EXPORT_SYMBOL(LUSTRE_SEQ_SPACE_RANGE); + +/* Zero range, used for init and other purposes. */ +const struct lu_seq_range LUSTRE_SEQ_ZERO_RANGE = { + 0, + 0 +}; +EXPORT_SYMBOL(LUSTRE_SEQ_ZERO_RANGE); + +/* Lustre Big Fs Lock fid. */ +const struct lu_fid LUSTRE_BFL_FID = { .f_seq = FID_SEQ_SPECIAL, + .f_oid = FID_OID_SPECIAL_BFL, + .f_ver = 0x0000000000000000 }; +EXPORT_SYMBOL(LUSTRE_BFL_FID); + +/** Special fid for ".lustre" directory */ +const struct lu_fid LU_DOT_LUSTRE_FID = { .f_seq = FID_SEQ_DOT_LUSTRE, + .f_oid = FID_OID_DOT_LUSTRE, + .f_ver = 0x0000000000000000 }; +EXPORT_SYMBOL(LU_DOT_LUSTRE_FID); + +/** Special fid for "fid" special object in .lustre */ +const struct lu_fid LU_OBF_FID = { .f_seq = FID_SEQ_DOT_LUSTRE, + .f_oid = FID_OID_DOT_LUSTRE_OBF, + .f_ver = 0x0000000000000000 }; +EXPORT_SYMBOL(LU_OBF_FID); |