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, 2013, 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  * 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_oi_id(&lmm->lmm_oi) == 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         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 144         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 145         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 146         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 147         lsm->lsm_pool_name[0] = '\0';
 148 }
 149
 150 static void
 151 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 152                            obd_off *lov_off, obd_off *swidth)
 153 {
 154         if (swidth)
 155                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 156 }
 157
 158 static void
 159 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 160                            obd_off *lov_off, obd_off *swidth)
 161 {
 162         if (swidth)
 163                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 164 }
 165
 166 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 167                              struct obd_export *md_exp)
 168 {
 169         return 0;
 170 }
 171
 172 /* Find minimum stripe maxbytes value.  For inactive or
 173  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 174 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 175 {
 176         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 177
 178         if (imp == NULL || !tgt->ltd_active) {
 179                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 180                 return;
 181         }
 182
 183         spin_lock(&imp->imp_lock);
 184         if (imp->imp_state == LUSTRE_IMP_FULL &&
 185             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 186             imp->imp_connect_data.ocd_maxbytes > 0) {
 187                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 188                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 189         } else {
 190                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 191         }
 192         spin_unlock(&imp->imp_lock);
 193 }
 194
 195 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 196                              __u16 *stripe_count)
 197 {
 198         if (lmm_bytes < sizeof(*lmm)) {
 199                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 200                        lmm_bytes, (int)sizeof(*lmm));
 201                 return -EINVAL;
 202         }
 203
 204         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 205
 206         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 207                 CERROR("LOV EA V1 too small: %d, need %d\n",
 208                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 209                 lov_dump_lmm_v1(D_WARNING, lmm);
 210                 return -EINVAL;
 211         }
 212
 213         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 214 }
 215
 216 int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 217                     struct lov_mds_md_v1 *lmm)
 218 {
 219         struct lov_oinfo *loi;
 220         int i;
 221         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 222
 223         lsm_unpackmd_common(lsm, lmm);
 224
 225         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 226                 /* XXX LOV STACKING call down to osc_unpackmd() */
 227                 loi = lsm->lsm_oinfo[i];
 228                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 229                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 230                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 231                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 232                         CERROR("OST index %d more than OST count %d\n",
 233                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 234                         lov_dump_lmm_v1(D_WARNING, lmm);
 235                         return -EINVAL;
 236                 }
 237                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 238                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 239                         lov_dump_lmm_v1(D_WARNING, lmm);
 240                         return -EINVAL;
 241                 }
 242                 /* calculate the minimum stripe max bytes */
 243                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 244                                  &stripe_maxbytes);
 245         }
 246
 247         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 248
 249         return 0;
 250 }
 251
 252 const struct lsm_operations lsm_v1_ops = {
 253         .lsm_free            = lsm_free_plain,
 254         .lsm_destroy         = lsm_destroy_plain,
 255         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 256         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 257         .lsm_lmm_verify         = lsm_lmm_verify_v1,
 258         .lsm_unpackmd           = lsm_unpackmd_v1,
 259 };
 260
 261 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 262                              __u16 *stripe_count)
 263 {
 264         struct lov_mds_md_v3 *lmm;
 265
 266         lmm = (struct lov_mds_md_v3 *)lmmv1;
 267
 268         if (lmm_bytes < sizeof(*lmm)) {
 269                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 270                        lmm_bytes, (int)sizeof(*lmm));
 271                 return -EINVAL;
 272         }
 273
 274         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 275
 276         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 277                 CERROR("LOV EA V3 too small: %d, need %d\n",
 278                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 279                 lov_dump_lmm_v3(D_WARNING, lmm);
 280                 return -EINVAL;
 281         }
 282
 283         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 284                                      *stripe_count);
 285 }
 286
 287 int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 288                     struct lov_mds_md *lmmv1)
 289 {
 290         struct lov_mds_md_v3 *lmm;
 291         struct lov_oinfo *loi;
 292         int i;
 293         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 294         int cplen = 0;
 295
 296         lmm = (struct lov_mds_md_v3 *)lmmv1;
 297
 298         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 299         cplen = strlcpy(lsm->lsm_pool_name, lmm->lmm_pool_name,
 300                         sizeof(lsm->lsm_pool_name));
 301         if (cplen >= sizeof(lsm->lsm_pool_name))
 302                 return -E2BIG;
 303
 304         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 305                 /* XXX LOV STACKING call down to osc_unpackmd() */
 306                 loi = lsm->lsm_oinfo[i];
 307                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 308                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 309                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 310                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 311                         CERROR("OST index %d more than OST count %d\n",
 312                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 313                         lov_dump_lmm_v3(D_WARNING, lmm);
 314                         return -EINVAL;
 315                 }
 316                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 317                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 318                         lov_dump_lmm_v3(D_WARNING, lmm);
 319                         return -EINVAL;
 320                 }
 321                 /* calculate the minimum stripe max bytes */
 322                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 323                                  &stripe_maxbytes);
 324         }
 325
 326         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 327
 328         return 0;
 329 }
 330
 331 const struct lsm_operations lsm_v3_ops = {
 332         .lsm_free            = lsm_free_plain,
 333         .lsm_destroy         = lsm_destroy_plain,
 334         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 335         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 336         .lsm_lmm_verify         = lsm_lmm_verify_v3,
 337         .lsm_unpackmd           = lsm_unpackmd_v3,
 338 };
 339