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/*
* 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) 2011, 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__
#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*);
}
static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
{
if (lmm_magic == LOV_MAGIC_V3)
return sizeof(struct lov_mds_md_v3) +
stripes * sizeof(struct lov_ost_data_v1);
else
return sizeof(struct lov_mds_md_v1) +
stripes * sizeof(struct lov_ost_data_v1);
}
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)
{
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)
#define IOC_LOV_MAX_NR 50
#define QOS_DEFAULT_THRESHOLD 10 /* MB */
#define QOS_DEFAULT_MAXAGE 5 /* Seconds */
#endif
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