lustre/lov/lov_ea.c

   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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lov/lov_ea.c
  37  *
  38  * Author: Wang Di <wangdi@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_LOV
  42
  43 #ifdef __KERNEL__
  44 #include <asm/div64.h>
  45 #include <libcfs/libcfs.h>
  46 #else
  47 #include <liblustre.h>
  48 #endif
  49
  50 #include <obd_class.h>
  51 #include <obd_lov.h>
  52 #include <lustre/lustre_idl.h>
  53
  54 #include "lov_internal.h"
  55
  56 struct lovea_unpack_args {
  57         struct lov_stripe_md *lsm;
  58         int                   cursor;
  59 };
  60
  61 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
  62                                  __u16 stripe_count)
  63 {
  64
  65         if (stripe_count == 0 || stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  66                 CERROR("bad stripe count %d\n", stripe_count);
  67                 lov_dump_lmm(D_WARNING, lmm);
  68                 return -EINVAL;
  69         }
  70
  71         if (lmm->lmm_object_id == 0) {
  72                 CERROR("zero object id\n");
  73                 lov_dump_lmm(D_WARNING, lmm);
  74                 return -EINVAL;
  75         }
  76
  77         if (lmm->lmm_pattern != cpu_to_le32(LOV_PATTERN_RAID0)) {
  78                 CERROR("bad striping pattern\n");
  79                 lov_dump_lmm(D_WARNING, lmm);
  80                 return -EINVAL;
  81         }
  82
  83         if (lmm->lmm_stripe_size == 0 ||
  84              (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  85                 CERROR("bad stripe size %u\n",
  86                        le32_to_cpu(lmm->lmm_stripe_size));
  87                 lov_dump_lmm(D_WARNING, lmm);
  88                 return -EINVAL;
  89         }
  90         return 0;
  91 }
  92
  93 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  94 {
  95         struct lov_stripe_md *lsm;
  96         struct lov_oinfo     *loi;
  97         int                   i, oinfo_ptrs_size;
  98
  99         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
 100
 101         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
 102         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
 103
 104         OBD_ALLOC_LARGE(lsm, *size);
 105         if (!lsm)
 106                 return NULL;;
 107
 108         for (i = 0; i < stripe_count; i++) {
 109                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, CFS_ALLOC_IO);
 110                 if (loi == NULL)
 111                         goto err;
 112                 lsm->lsm_oinfo[i] = loi;
 113         }
 114         lsm->lsm_stripe_count = stripe_count;
 115         return lsm;
 116
 117 err:
 118         while (--i >= 0)
 119                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab, sizeof(*loi));
 120         OBD_FREE_LARGE(lsm, *size);
 121         return NULL;
 122 }
 123
 124 void lsm_free_plain(struct lov_stripe_md *lsm)
 125 {
 126         __u16 stripe_count = lsm->lsm_stripe_count;
 127         int i;
 128
 129         for (i = 0; i < stripe_count; i++)
 130                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab,
 131                               sizeof(struct lov_oinfo));
 132         OBD_FREE_LARGE(lsm, sizeof(struct lov_stripe_md) +
 133                        stripe_count * sizeof(struct lov_oinfo *));
 134 }
 135
 136 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 137                                 struct lov_mds_md *lmm)
 138 {
 139         /*
 140          * This supposes lov_mds_md_v1/v3 first fields are
 141          * are the same
 142          */
 143         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 144         lsm->lsm_object_seq = le64_to_cpu(lmm->lmm_object_seq);
 145         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 146         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 147         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 148         lsm->lsm_pool_name[0] = '\0';
 149 }
 150
 151 static void
 152 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 153                            obd_off *lov_off, obd_off *swidth)
 154 {
 155         if (swidth)
 156                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 157 }
 158
 159 static void
 160 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 161                            obd_off *lov_off, obd_off *swidth)
 162 {
 163         if (swidth)
 164                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 165 }
 166
 167 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 168                              struct obd_export *md_exp)
 169 {
 170         return 0;
 171 }
 172
 173 /* Find minimum stripe maxbytes value.  For inactive or
 174  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 175 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 176 {
 177         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 178
 179         if (imp == NULL || !tgt->ltd_active) {
 180                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 181                 return;
 182         }
 183
 184         cfs_spin_lock(&imp->imp_lock);
 185         if (imp->imp_state == LUSTRE_IMP_FULL &&
 186            (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 187            imp->imp_connect_data.ocd_maxbytes > 0) {
 188                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 189                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 190         } else {
 191                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 192         }
 193         cfs_spin_unlock(&imp->imp_lock);
 194 }
 195
 196 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 197                              __u16 *stripe_count)
 198 {
 199         if (lmm_bytes < sizeof(*lmm)) {
 200                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 201                        lmm_bytes, (int)sizeof(*lmm));
 202                 return -EINVAL;
 203         }
 204
 205         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 206
 207         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 208                 CERROR("LOV EA V1 too small: %d, need %d\n",
 209                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 210                 lov_dump_lmm_v1(D_WARNING, lmm);
 211                 return -EINVAL;
 212         }
 213
 214         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 215 }
 216
 217 int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 218                     struct lov_mds_md_v1 *lmm)
 219 {
 220         struct lov_oinfo *loi;
 221         int i;
 222         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 223
 224         lsm_unpackmd_common(lsm, lmm);
 225
 226         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 227                 /* XXX LOV STACKING call down to osc_unpackmd() */
 228                 loi = lsm->lsm_oinfo[i];
 229                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 230                 loi->loi_seq = le64_to_cpu(lmm->lmm_objects[i].l_object_seq);
 231                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 232                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 233                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 234                         CERROR("OST index %d more than OST count %d\n",
 235                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 236                         lov_dump_lmm_v1(D_WARNING, lmm);
 237                         return -EINVAL;
 238                 }
 239                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 240                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 241                         lov_dump_lmm_v1(D_WARNING, lmm);
 242                         return -EINVAL;
 243                 }
 244                 /* calculate the minimum stripe max bytes */
 245                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 246                                  &stripe_maxbytes);
 247         }
 248
 249         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 250
 251         return 0;
 252 }
 253
 254 const struct lsm_operations lsm_v1_ops = {
 255         .lsm_free            = lsm_free_plain,
 256         .lsm_destroy         = lsm_destroy_plain,
 257         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 258         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 259         .lsm_lmm_verify         = lsm_lmm_verify_v1,
 260         .lsm_unpackmd           = lsm_unpackmd_v1,
 261 };
 262
 263 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 264                              __u16 *stripe_count)
 265 {
 266         struct lov_mds_md_v3 *lmm;
 267
 268         lmm = (struct lov_mds_md_v3 *)lmmv1;
 269
 270         if (lmm_bytes < sizeof(*lmm)) {
 271                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 272                        lmm_bytes, (int)sizeof(*lmm));
 273                 return -EINVAL;
 274         }
 275
 276         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 277
 278         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 279                 CERROR("LOV EA V3 too small: %d, need %d\n",
 280                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 281                 lov_dump_lmm_v3(D_WARNING, lmm);
 282                 return -EINVAL;
 283         }
 284
 285         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 286                                      *stripe_count);
 287 }
 288
 289 int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 290                     struct lov_mds_md *lmmv1)
 291 {
 292         struct lov_mds_md_v3 *lmm;
 293         struct lov_oinfo *loi;
 294         int i;
 295         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 296
 297         lmm = (struct lov_mds_md_v3 *)lmmv1;
 298
 299         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 300         strncpy(lsm->lsm_pool_name, lmm->lmm_pool_name, LOV_MAXPOOLNAME);
 301
 302         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 303                 /* XXX LOV STACKING call down to osc_unpackmd() */
 304                 loi = lsm->lsm_oinfo[i];
 305                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 306                 loi->loi_seq = le64_to_cpu(lmm->lmm_objects[i].l_object_seq);
 307                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 308                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 309                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 310                         CERROR("OST index %d more than OST count %d\n",
 311                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 312                         lov_dump_lmm_v3(D_WARNING, lmm);
 313                         return -EINVAL;
 314                 }
 315                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 316                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 317                         lov_dump_lmm_v3(D_WARNING, lmm);
 318                         return -EINVAL;
 319                 }
 320                 /* calculate the minimum stripe max bytes */
 321                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 322                                  &stripe_maxbytes);
 323         }
 324
 325         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 326
 327         return 0;
 328 }
 329
 330 const struct lsm_operations lsm_v3_ops = {
 331         .lsm_free            = lsm_free_plain,
 332         .lsm_destroy         = lsm_destroy_plain,
 333         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 334         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 335         .lsm_lmm_verify         = lsm_lmm_verify_v3,
 336         .lsm_unpackmd           = lsm_unpackmd_v3,
 337 };
 338