-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * 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) 2002, 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.
*/
#ifndef _OBD_LOV_H__
#define _OBD_LOV_H__
-static inline int lov_stripe_md_size(int stripes)
+#define LOV_DEFAULT_STRIPE_SIZE (1 << LNET_MTU_BITS)
+
+static inline int lov_stripe_md_size(__u16 stripes)
{
return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
}
-#define lov_mds_md_size(stripes) lov_mds_md_v1_size(stripes)
-static inline int lov_mds_md_v1_size(int stripes)
+struct lov_version_size {
+ __u32 lvs_magic;
+ size_t lvs_lmm_size;
+ size_t lvs_lod_size;
+};
+
+static inline __u32 lov_mds_md_stripecnt(int ea_size, __u32 lmm_magic)
{
- return sizeof(struct lov_mds_md_v1) +
- stripes * sizeof(struct lov_ost_data_v1);
+ static const struct lov_version_size lmm_ver_size[] = {
+ { .lvs_magic = LOV_MAGIC_V3,
+ .lvs_lmm_size = sizeof(struct lov_mds_md_v3),
+ .lvs_lod_size = sizeof(struct lov_ost_data_v1) },
+ { .lvs_magic = LOV_MAGIC_V1,
+ .lvs_lmm_size = sizeof(struct lov_mds_md_v1),
+ .lvs_lod_size = sizeof(struct lov_ost_data_v1)} };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(lmm_ver_size); i++) {
+ if (lmm_magic == lmm_ver_size[i].lvs_magic) {
+ if (ea_size <= lmm_ver_size[i].lvs_lmm_size)
+ return 0;
+ return (ea_size - lmm_ver_size[i].lvs_lmm_size) /
+ lmm_ver_size[i].lvs_lod_size;
+ }
+ }
+
+ /* Invalid LOV magic, so no stripes could fit */
+ return 0;
}
+/* lov_do_div64(a, b) returns a % b, and a = a / b.
+ * The 32-bit code is LOV-specific due to knowing about stripe limits in
+ * order to reduce the divisor to a 32-bit number. If the divisor is
+ * already a 32-bit value the compiler handles this directly. */
+#if BITS_PER_LONG > 32
+# define lov_do_div64(n,base) ({ \
+ uint64_t __base = (base); \
+ uint64_t __rem; \
+ __rem = ((uint64_t)(n)) % __base; \
+ (n) = ((uint64_t)(n)) / __base; \
+ __rem; \
+ })
+#else
+# define lov_do_div64(n,base) ({ \
+ uint64_t __rem; \
+ if ((sizeof(base) > 4) && (((base) & 0xffffffff00000000ULL) != 0)) { \
+ int __remainder; \
+ LASSERTF(!((base) & (LOV_MIN_STRIPE_SIZE - 1)), "64 bit lov " \
+ "division %llu / %llu\n", (n), (uint64_t)(base)); \
+ __remainder = (n) & (LOV_MIN_STRIPE_SIZE - 1); \
+ (n) >>= LOV_MIN_STRIPE_BITS; \
+ __rem = do_div(n, (base) >> LOV_MIN_STRIPE_BITS); \
+ __rem <<= LOV_MIN_STRIPE_BITS; \
+ __rem += __remainder; \
+ } else { \
+ __rem = do_div(n, base); \
+ } \
+ __rem; \
+ })
+#endif
+
#define IOC_LOV_TYPE 'g'
#define IOC_LOV_MIN_NR 50
#define IOC_LOV_SET_OSC_ACTIVE _IOWR('g', 50, long)
git://git.whamcloud.com / fs / lustre-release.git / blobdiff