diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/include/obd_lov.h')
| -rw-r--r-- | drivers/staging/lustre/lustre/include/obd_lov.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/include/obd_lov.h b/drivers/staging/lustre/lustre/include/obd_lov.h new file mode 100644 index 000000000000..d82f3341d0a8 --- /dev/null +++ b/drivers/staging/lustre/lustre/include/obd_lov.h @@ -0,0 +1,126 @@ +/* + * 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 |