drivers/staging/lustre/lustre/lov/lov_internal.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef LOV_INTERNAL_H
  38 #define LOV_INTERNAL_H
  39
  40 #include "../include/obd_class.h"
  41 #include "../include/lustre/lustre_user.h"
  42
  43 /* lov_do_div64(a, b) returns a % b, and a = a / b.
  44  * The 32-bit code is LOV-specific due to knowing about stripe limits in
  45  * order to reduce the divisor to a 32-bit number.  If the divisor is
  46  * already a 32-bit value the compiler handles this directly. */
  47 #if BITS_PER_LONG == 64
  48 # define lov_do_div64(n, base) ({                                       \
  49         uint64_t __base = (base);                                       \
  50         uint64_t __rem;                                                 \
  51         __rem = ((uint64_t)(n)) % __base;                               \
  52         (n) = ((uint64_t)(n)) / __base;                                 \
  53         __rem;                                                          \
  54 })
  55 #elif BITS_PER_LONG == 32
  56 # define lov_do_div64(n, base) ({                                       \
  57         uint64_t __rem;                                                 \
  58         if ((sizeof(base) > 4) && (((base) & 0xffffffff00000000ULL) != 0)) {  \
  59                 int __remainder;                                              \
  60                 LASSERTF(!((base) & (LOV_MIN_STRIPE_SIZE - 1)), "64 bit lov " \
  61                          "division %llu / %llu\n", (n), (uint64_t)(base));    \
  62                 __remainder = (n) & (LOV_MIN_STRIPE_SIZE - 1);          \
  63                 (n) >>= LOV_MIN_STRIPE_BITS;                            \
  64                 __rem = do_div(n, (base) >> LOV_MIN_STRIPE_BITS);       \
  65                 __rem <<= LOV_MIN_STRIPE_BITS;                          \
  66                 __rem += __remainder;                                   \
  67         } else {                                                        \
  68                 __rem = do_div(n, base);                                \
  69         }                                                               \
  70         __rem;                                                          \
  71 })
  72 #endif
  73
  74 struct lov_request {
  75         struct obd_info   rq_oi;
  76         struct lov_request_set  *rq_rqset;
  77
  78         struct list_head               rq_link;
  79
  80         int                   rq_idx;   /* index in lov->tgts array */
  81         int                   rq_stripe;     /* stripe number */
  82         int                   rq_complete;
  83         int                   rq_rc;
  84
  85         u32                   rq_oabufs;
  86         u32                   rq_pgaidx;
  87 };
  88
  89 struct lov_request_set {
  90         struct ldlm_enqueue_info        *set_ei;
  91         struct obd_info                 *set_oi;
  92         atomic_t                        set_refcount;
  93         struct obd_export               *set_exp;
  94         /* XXX: There is @set_exp already, however obd_statfs gets obd_device
  95            only. */
  96         struct obd_device               *set_obd;
  97         int                             set_count;
  98         atomic_t                        set_completes;
  99         atomic_t                        set_success;
 100         atomic_t                        set_finish_checked;
 101         struct llog_cookie              *set_cookies;
 102         int                             set_cookie_sent;
 103         struct obd_trans_info           *set_oti;
 104         struct list_head                        set_list;
 105         wait_queue_head_t                       set_waitq;
 106         spinlock_t                      set_lock;
 107 };
 108
 109 extern struct kmem_cache *lov_oinfo_slab;
 110
 111 extern struct lu_kmem_descr lov_caches[];
 112
 113 void lov_finish_set(struct lov_request_set *set);
 114
 115 static inline void lov_get_reqset(struct lov_request_set *set)
 116 {
 117         LASSERT(atomic_read(&set->set_refcount) > 0);
 118         atomic_inc(&set->set_refcount);
 119 }
 120
 121 static inline void lov_put_reqset(struct lov_request_set *set)
 122 {
 123         if (atomic_dec_and_test(&set->set_refcount))
 124                 lov_finish_set(set);
 125 }
 126
 127 #define lov_uuid2str(lv, index) \
 128         (char *)((lv)->lov_tgts[index]->ltd_uuid.uuid)
 129
 130 /* lov_merge.c */
 131 void lov_merge_attrs(struct obdo *tgt, struct obdo *src, u64 valid,
 132                      struct lov_stripe_md *lsm, int stripeno, int *set);
 133 int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
 134                    u64 size, int shrink);
 135 int lov_merge_lvb_kms(struct lov_stripe_md *lsm,
 136                       struct ost_lvb *lvb, __u64 *kms_place);
 137
 138 /* lov_offset.c */
 139 u64 lov_stripe_size(struct lov_stripe_md *lsm, u64 ost_size,
 140                          int stripeno);
 141 int lov_stripe_offset(struct lov_stripe_md *lsm, u64 lov_off,
 142                       int stripeno, u64 *u64);
 143 u64 lov_size_to_stripe(struct lov_stripe_md *lsm, u64 file_size,
 144                            int stripeno);
 145 int lov_stripe_intersects(struct lov_stripe_md *lsm, int stripeno,
 146                           u64 start, u64 end,
 147                           u64 *obd_start, u64 *obd_end);
 148 int lov_stripe_number(struct lov_stripe_md *lsm, u64 lov_off);
 149
 150 /* lov_qos.c */
 151 #define LOV_USES_ASSIGNED_STRIPE        0
 152 #define LOV_USES_DEFAULT_STRIPE  1
 153
 154 /* lov_request.c */
 155 int lov_update_common_set(struct lov_request_set *set,
 156                           struct lov_request *req, int rc);
 157 int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
 158                          struct lov_request_set **reqset);
 159 int lov_fini_getattr_set(struct lov_request_set *set);
 160 int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
 161                          struct obdo *src_oa, struct lov_stripe_md *lsm,
 162                          struct obd_trans_info *oti,
 163                          struct lov_request_set **reqset);
 164 int lov_fini_destroy_set(struct lov_request_set *set);
 165 int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
 166                          struct obd_trans_info *oti,
 167                          struct lov_request_set **reqset);
 168 int lov_update_setattr_set(struct lov_request_set *set,
 169                            struct lov_request *req, int rc);
 170 int lov_fini_setattr_set(struct lov_request_set *set);
 171 int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 172                         struct lov_request_set **reqset);
 173 int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 174                     int success);
 175 int lov_fini_statfs_set(struct lov_request_set *set);
 176 int lov_statfs_interpret(struct ptlrpc_request_set *rqset, void *data, int rc);
 177
 178 /* lov_obd.c */
 179 void lov_fix_desc(struct lov_desc *desc);
 180 void lov_fix_desc_stripe_size(__u64 *val);
 181 void lov_fix_desc_stripe_count(__u32 *val);
 182 void lov_fix_desc_pattern(__u32 *val);
 183 void lov_fix_desc_qos_maxage(__u32 *val);
 184 __u16 lov_get_stripecnt(struct lov_obd *lov, __u32 magic, __u16 stripe_count);
 185 int lov_connect_obd(struct obd_device *obd, __u32 index, int activate,
 186                     struct obd_connect_data *data);
 187 int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg);
 188 int lov_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg,
 189                             __u32 *indexp, int *genp);
 190 int lov_del_target(struct obd_device *obd, __u32 index,
 191                    struct obd_uuid *uuidp, int gen);
 192
 193 /* lov_pack.c */
 194 int lov_packmd(struct obd_export *exp, struct lov_mds_md **lmm,
 195                struct lov_stripe_md *lsm);
 196 int lov_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 197                  struct lov_mds_md *lmm, int lmm_bytes);
 198 int lov_getstripe(struct obd_export *exp,
 199                   struct lov_stripe_md *lsm, struct lov_user_md __user *lump);
 200 int lov_alloc_memmd(struct lov_stripe_md **lsmp, __u16 stripe_count,
 201                     int pattern, int magic);
 202 int lov_free_memmd(struct lov_stripe_md **lsmp);
 203
 204 void lov_dump_lmm_v1(int level, struct lov_mds_md_v1 *lmm);
 205 void lov_dump_lmm_v3(int level, struct lov_mds_md_v3 *lmm);
 206 void lov_dump_lmm_common(int level, void *lmmp);
 207
 208 /* lov_ea.c */
 209 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size);
 210 void lsm_free_plain(struct lov_stripe_md *lsm);
 211 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm);
 212
 213 /* lproc_lov.c */
 214 extern const struct file_operations lov_proc_target_fops;
 215 void lprocfs_lov_init_vars(struct lprocfs_static_vars *lvars);
 216
 217 /* lov_cl.c */
 218 extern struct lu_device_type lov_device_type;
 219
 220 /* pools */
 221 extern struct cfs_hash_ops pool_hash_operations;
 222 /* ost_pool methods */
 223 int lov_ost_pool_init(struct ost_pool *op, unsigned int count);
 224 int lov_ost_pool_extend(struct ost_pool *op, unsigned int min_count);
 225 int lov_ost_pool_add(struct ost_pool *op, __u32 idx, unsigned int min_count);
 226 int lov_ost_pool_remove(struct ost_pool *op, __u32 idx);
 227 int lov_ost_pool_free(struct ost_pool *op);
 228
 229 /* high level pool methods */
 230 int lov_pool_new(struct obd_device *obd, char *poolname);
 231 int lov_pool_del(struct obd_device *obd, char *poolname);
 232 int lov_pool_add(struct obd_device *obd, char *poolname, char *ostname);
 233 int lov_pool_remove(struct obd_device *obd, char *poolname, char *ostname);
 234 struct pool_desc *lov_find_pool(struct lov_obd *lov, char *poolname);
 235 int lov_check_index_in_pool(__u32 idx, struct pool_desc *pool);
 236 void lov_pool_putref(struct pool_desc *pool);
 237
 238 static inline struct lov_stripe_md *lsm_addref(struct lov_stripe_md *lsm)
 239 {
 240         LASSERT(atomic_read(&lsm->lsm_refc) > 0);
 241         atomic_inc(&lsm->lsm_refc);
 242         return lsm;
 243 }
 244
 245 static inline bool lov_oinfo_is_dummy(const struct lov_oinfo *loi)
 246 {
 247         if (unlikely(loi->loi_oi.oi.oi_id == 0 &&
 248                      loi->loi_oi.oi.oi_seq == 0 &&
 249                      loi->loi_ost_idx == 0 &&
 250                      loi->loi_ost_gen == 0))
 251                 return true;
 252
 253         return false;
 254 }
 255
 256 #endif