diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/include/lustre_lmv.h')
| -rw-r--r-- | drivers/staging/lustre/lustre/include/lustre_lmv.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre_lmv.h b/drivers/staging/lustre/lustre/include/lustre_lmv.h new file mode 100644 index 000000000000..d7f7afa8dfa7 --- /dev/null +++ b/drivers/staging/lustre/lustre/include/lustre_lmv.h @@ -0,0 +1,184 @@ +/* + * 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 COPYING 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 + * + * GPL HEADER END + */ +/* + * Copyright (c) 2013, Intel Corporation. + */ +/* + * lustre/include/lustre_lmv.h + * + * Lustre LMV structures and functions. + * + * Author: Di Wang <di.wang@intel.com> + */ + +#ifndef _LUSTRE_LMV_H +#define _LUSTRE_LMV_H +#include "lustre/lustre_idl.h" + +struct lmv_oinfo { + struct lu_fid lmo_fid; + u32 lmo_mds; + struct inode *lmo_root; +}; + +struct lmv_stripe_md { + __u32 lsm_md_magic; + __u32 lsm_md_stripe_count; + __u32 lsm_md_master_mdt_index; + __u32 lsm_md_hash_type; + __u32 lsm_md_layout_version; + __u32 lsm_md_default_count; + __u32 lsm_md_default_index; + char lsm_md_pool_name[LOV_MAXPOOLNAME + 1]; + struct lmv_oinfo lsm_md_oinfo[0]; +}; + +static inline bool +lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2) +{ + __u32 idx; + + if (lsm1->lsm_md_magic != lsm2->lsm_md_magic || + lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count || + lsm1->lsm_md_master_mdt_index != lsm2->lsm_md_master_mdt_index || + lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type || + lsm1->lsm_md_layout_version != lsm2->lsm_md_layout_version || + !strcmp(lsm1->lsm_md_pool_name, lsm2->lsm_md_pool_name)) + return false; + + for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) { + if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid, + &lsm2->lsm_md_oinfo[idx].lmo_fid)) + return false; + } + + return true; +} + +union lmv_mds_md; + +int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp, + const union lmv_mds_md *lmm, int stripe_count); + +static inline int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripe_count) +{ + return lmv_unpack_md(NULL, lsmp, NULL, stripe_count); +} + +static inline void lmv_free_memmd(struct lmv_stripe_md *lsm) +{ + lmv_unpack_md(NULL, &lsm, NULL, 0); +} + +static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst, + const struct lmv_mds_md_v1 *lmv_src) +{ + __u32 i; + + lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic); + lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count); + lmv_dst->lmv_master_mdt_index = + le32_to_cpu(lmv_src->lmv_master_mdt_index); + lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type); + lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version); + + for (i = 0; i < lmv_src->lmv_stripe_count; i++) + fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i], + &lmv_src->lmv_stripe_fids[i]); +} + +static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst, + const union lmv_mds_md *lmv_src) +{ + switch (le32_to_cpu(lmv_src->lmv_magic)) { + case LMV_MAGIC_V1: + lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1); + break; + default: + break; + } +} + +/* This hash is only for testing purpose */ +static inline unsigned int +lmv_hash_all_chars(unsigned int count, const char *name, int namelen) +{ + const unsigned char *p = (const unsigned char *)name; + unsigned int c = 0; + + while (--namelen >= 0) + c += p[namelen]; + + c = c % count; + + return c; +} + +static inline unsigned int +lmv_hash_fnv1a(unsigned int count, const char *name, int namelen) +{ + __u64 hash; + + hash = lustre_hash_fnv_1a_64(name, namelen); + + return do_div(hash, count); +} + +static inline int lmv_name_to_stripe_index(__u32 lmv_hash_type, + unsigned int stripe_count, + const char *name, int namelen) +{ + __u32 hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK; + int idx; + + LASSERT(namelen > 0); + if (stripe_count <= 1) + return 0; + + /* for migrating object, always start from 0 stripe */ + if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION) + return 0; + + switch (hash_type) { + case LMV_HASH_TYPE_ALL_CHARS: + idx = lmv_hash_all_chars(stripe_count, name, namelen); + break; + case LMV_HASH_TYPE_FNV_1A_64: + idx = lmv_hash_fnv1a(stripe_count, name, namelen); + break; + default: + idx = -EBADFD; + break; + } + CDEBUG(D_INFO, "name %.*s hash_type %d idx %d\n", namelen, name, + hash_type, idx); + + return idx; +} + +static inline bool lmv_is_known_hash_type(__u32 type) +{ + return (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_FNV_1A_64 || + (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_ALL_CHARS; +} + +#endif |