drivers/staging/lustre/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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lov/lov_ea.c
  33  *
  34  * Author: Wang Di <wangdi@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LOV
  38
  39 #include <asm/div64.h>
  40 #include "../../include/linux/libcfs/libcfs.h"
  41
  42 #include "../include/obd_class.h"
  43 #include "../include/lustre/lustre_idl.h"
  44
  45 #include "lov_internal.h"
  46
  47 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
  48                                  __u16 stripe_count)
  49 {
  50         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  51                 CERROR("bad stripe count %d\n", stripe_count);
  52                 lov_dump_lmm_common(D_WARNING, lmm);
  53                 return -EINVAL;
  54         }
  55
  56         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  57                 CERROR("zero object id\n");
  58                 lov_dump_lmm_common(D_WARNING, lmm);
  59                 return -EINVAL;
  60         }
  61
  62         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  63                 CERROR("bad striping pattern\n");
  64                 lov_dump_lmm_common(D_WARNING, lmm);
  65                 return -EINVAL;
  66         }
  67
  68         if (lmm->lmm_stripe_size == 0 ||
  69             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  70                 CERROR("bad stripe size %u\n",
  71                        le32_to_cpu(lmm->lmm_stripe_size));
  72                 lov_dump_lmm_common(D_WARNING, lmm);
  73                 return -EINVAL;
  74         }
  75         return 0;
  76 }
  77
  78 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  79 {
  80         struct lov_stripe_md *lsm;
  81         struct lov_oinfo     *loi;
  82         int                i, oinfo_ptrs_size;
  83
  84         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  85
  86         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
  87         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
  88
  89         lsm = libcfs_kvzalloc(*size, GFP_NOFS);
  90         if (!lsm)
  91                 return NULL;
  92
  93         for (i = 0; i < stripe_count; i++) {
  94                 loi = kmem_cache_zalloc(lov_oinfo_slab, GFP_NOFS);
  95                 if (!loi)
  96                         goto err;
  97                 lsm->lsm_oinfo[i] = loi;
  98         }
  99         lsm->lsm_stripe_count = stripe_count;
 100         return lsm;
 101
 102 err:
 103         while (--i >= 0)
 104                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 105         kvfree(lsm);
 106         return NULL;
 107 }
 108
 109 void lsm_free_plain(struct lov_stripe_md *lsm)
 110 {
 111         __u16 stripe_count = lsm->lsm_stripe_count;
 112         int i;
 113
 114         for (i = 0; i < stripe_count; i++)
 115                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 116         kvfree(lsm);
 117 }
 118
 119 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 120                                 struct lov_mds_md *lmm)
 121 {
 122         /*
 123          * This supposes lov_mds_md_v1/v3 first fields are
 124          * are the same
 125          */
 126         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 127         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 128         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 129         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 130         lsm->lsm_pool_name[0] = '\0';
 131 }
 132
 133 static void
 134 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 135                           u64 *lov_off, u64 *swidth)
 136 {
 137         if (swidth)
 138                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 139 }
 140
 141 static void
 142 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 143                            u64 *lov_off, u64 *swidth)
 144 {
 145         if (swidth)
 146                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 147 }
 148
 149 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 150                              struct obd_export *md_exp)
 151 {
 152         return 0;
 153 }
 154
 155 /* Find minimum stripe maxbytes value.  For inactive or
 156  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES.
 157  */
 158 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 159 {
 160         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 161
 162         if (!imp || !tgt->ltd_active) {
 163                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 164                 return;
 165         }
 166
 167         spin_lock(&imp->imp_lock);
 168         if (imp->imp_state == LUSTRE_IMP_FULL &&
 169             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 170             imp->imp_connect_data.ocd_maxbytes > 0) {
 171                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 172                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 173         } else {
 174                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 175         }
 176         spin_unlock(&imp->imp_lock);
 177 }
 178
 179 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 180                              __u16 *stripe_count)
 181 {
 182         if (lmm_bytes < sizeof(*lmm)) {
 183                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 184                        lmm_bytes, (int)sizeof(*lmm));
 185                 return -EINVAL;
 186         }
 187
 188         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 189         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 190                 *stripe_count = 0;
 191
 192         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 193                 CERROR("LOV EA V1 too small: %d, need %d\n",
 194                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 195                 lov_dump_lmm_common(D_WARNING, lmm);
 196                 return -EINVAL;
 197         }
 198
 199         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 200 }
 201
 202 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 203                            struct lov_mds_md_v1 *lmm)
 204 {
 205         struct lov_oinfo *loi;
 206         int i;
 207         int stripe_count;
 208         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 209
 210         lsm_unpackmd_common(lsm, lmm);
 211
 212         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 213
 214         for (i = 0; i < stripe_count; i++) {
 215                 /* XXX LOV STACKING call down to osc_unpackmd() */
 216                 loi = lsm->lsm_oinfo[i];
 217                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 218                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 219                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 220                 if (lov_oinfo_is_dummy(loi))
 221                         continue;
 222
 223                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 224                         CERROR("OST index %d more than OST count %d\n",
 225                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 226                         lov_dump_lmm_v1(D_WARNING, lmm);
 227                         return -EINVAL;
 228                 }
 229                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 230                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 231                         lov_dump_lmm_v1(D_WARNING, lmm);
 232                         return -EINVAL;
 233                 }
 234                 /* calculate the minimum stripe max bytes */
 235                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 236                                  &stripe_maxbytes);
 237         }
 238
 239         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 240         if (lsm->lsm_stripe_count == 0)
 241                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 242
 243         return 0;
 244 }
 245
 246 const struct lsm_operations lsm_v1_ops = {
 247         .lsm_free           = lsm_free_plain,
 248         .lsm_destroy     = lsm_destroy_plain,
 249         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 250         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 251         .lsm_lmm_verify  = lsm_lmm_verify_v1,
 252         .lsm_unpackmd      = lsm_unpackmd_v1,
 253 };
 254
 255 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 256                              __u16 *stripe_count)
 257 {
 258         struct lov_mds_md_v3 *lmm;
 259
 260         lmm = (struct lov_mds_md_v3 *)lmmv1;
 261
 262         if (lmm_bytes < sizeof(*lmm)) {
 263                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 264                        lmm_bytes, (int)sizeof(*lmm));
 265                 return -EINVAL;
 266         }
 267
 268         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 269         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 270                 *stripe_count = 0;
 271
 272         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 273                 CERROR("LOV EA V3 too small: %d, need %d\n",
 274                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 275                 lov_dump_lmm_common(D_WARNING, lmm);
 276                 return -EINVAL;
 277         }
 278
 279         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 280                                      *stripe_count);
 281 }
 282
 283 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 284                            struct lov_mds_md *lmmv1)
 285 {
 286         struct lov_mds_md_v3 *lmm;
 287         struct lov_oinfo *loi;
 288         int i;
 289         int stripe_count;
 290         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 291         int cplen = 0;
 292
 293         lmm = (struct lov_mds_md_v3 *)lmmv1;
 294
 295         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 296
 297         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 298
 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 < 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 (lov_oinfo_is_dummy(loi))
 311                         continue;
 312
 313                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 314                         CERROR("OST index %d more than OST count %d\n",
 315                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 316                         lov_dump_lmm_v3(D_WARNING, lmm);
 317                         return -EINVAL;
 318                 }
 319                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 320                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 321                         lov_dump_lmm_v3(D_WARNING, lmm);
 322                         return -EINVAL;
 323                 }
 324                 /* calculate the minimum stripe max bytes */
 325                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 326                                  &stripe_maxbytes);
 327         }
 328
 329         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 330         if (lsm->lsm_stripe_count == 0)
 331                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 332
 333         return 0;
 334 }
 335
 336 const struct lsm_operations lsm_v3_ops = {
 337         .lsm_free           = lsm_free_plain,
 338         .lsm_destroy     = lsm_destroy_plain,
 339         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 340         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 341         .lsm_lmm_verify  = lsm_lmm_verify_v3,
 342         .lsm_unpackmd      = lsm_unpackmd_v3,
 343 };
 344
 345 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 346 {
 347         CDEBUG(level, "lsm %p, objid " DOSTID ", maxbytes %#llx, magic 0x%08X, stripe_size %u, stripe_count %u, refc: %d, layout_gen %u, pool [" LOV_POOLNAMEF "]\n",
 348                lsm,
 349                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 350                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 351                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 352                lsm->lsm_pool_name);
 353 }