kernel/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.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, 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 #include <asm/div64.h>
  44 #include "../../include/linux/libcfs/libcfs.h"
  45
  46 #include "../include/obd_class.h"
  47 #include "../include/lustre/lustre_idl.h"
  48
  49 #include "lov_internal.h"
  50
  51 struct lovea_unpack_args {
  52         struct lov_stripe_md *lsm;
  53         int                cursor;
  54 };
  55
  56 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
  57                                  __u16 stripe_count)
  58 {
  59         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  60                 CERROR("bad stripe count %d\n", stripe_count);
  61                 lov_dump_lmm_common(D_WARNING, lmm);
  62                 return -EINVAL;
  63         }
  64
  65         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  66                 CERROR("zero object id\n");
  67                 lov_dump_lmm_common(D_WARNING, lmm);
  68                 return -EINVAL;
  69         }
  70
  71         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  72                 CERROR("bad striping pattern\n");
  73                 lov_dump_lmm_common(D_WARNING, lmm);
  74                 return -EINVAL;
  75         }
  76
  77         if (lmm->lmm_stripe_size == 0 ||
  78             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  79                 CERROR("bad stripe size %u\n",
  80                        le32_to_cpu(lmm->lmm_stripe_size));
  81                 lov_dump_lmm_common(D_WARNING, lmm);
  82                 return -EINVAL;
  83         }
  84         return 0;
  85 }
  86
  87 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  88 {
  89         struct lov_stripe_md *lsm;
  90         struct lov_oinfo     *loi;
  91         int                i, oinfo_ptrs_size;
  92
  93         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  94
  95         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
  96         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
  97
  98         OBD_ALLOC_LARGE(lsm, *size);
  99         if (!lsm)
 100                 return NULL;
 101
 102         for (i = 0; i < stripe_count; i++) {
 103                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
 104                 if (loi == NULL)
 105                         goto err;
 106                 lsm->lsm_oinfo[i] = loi;
 107         }
 108         lsm->lsm_stripe_count = stripe_count;
 109         return lsm;
 110
 111 err:
 112         while (--i >= 0)
 113                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab, sizeof(*loi));
 114         OBD_FREE_LARGE(lsm, *size);
 115         return NULL;
 116 }
 117
 118 void lsm_free_plain(struct lov_stripe_md *lsm)
 119 {
 120         __u16 stripe_count = lsm->lsm_stripe_count;
 121         int i;
 122
 123         for (i = 0; i < stripe_count; i++)
 124                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab,
 125                               sizeof(struct lov_oinfo));
 126         OBD_FREE_LARGE(lsm, sizeof(struct lov_stripe_md) +
 127                        stripe_count * sizeof(struct lov_oinfo *));
 128 }
 129
 130 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 131                                 struct lov_mds_md *lmm)
 132 {
 133         /*
 134          * This supposes lov_mds_md_v1/v3 first fields are
 135          * are the same
 136          */
 137         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 138         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 139         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 140         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 141         lsm->lsm_pool_name[0] = '\0';
 142 }
 143
 144 static void
 145 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 146                            u64 *lov_off, u64 *swidth)
 147 {
 148         if (swidth)
 149                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 150 }
 151
 152 static void
 153 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 154                            u64 *lov_off, u64 *swidth)
 155 {
 156         if (swidth)
 157                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 158 }
 159
 160 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 161                              struct obd_export *md_exp)
 162 {
 163         return 0;
 164 }
 165
 166 /* Find minimum stripe maxbytes value.  For inactive or
 167  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 168 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 169 {
 170         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 171
 172         if (imp == NULL || !tgt->ltd_active) {
 173                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 174                 return;
 175         }
 176
 177         spin_lock(&imp->imp_lock);
 178         if (imp->imp_state == LUSTRE_IMP_FULL &&
 179             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 180             imp->imp_connect_data.ocd_maxbytes > 0) {
 181                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 182                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 183         } else {
 184                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 185         }
 186         spin_unlock(&imp->imp_lock);
 187 }
 188
 189 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 190                              __u16 *stripe_count)
 191 {
 192         if (lmm_bytes < sizeof(*lmm)) {
 193                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 194                        lmm_bytes, (int)sizeof(*lmm));
 195                 return -EINVAL;
 196         }
 197
 198         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 199         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 200                 *stripe_count = 0;
 201
 202         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 203                 CERROR("LOV EA V1 too small: %d, need %d\n",
 204                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 205                 lov_dump_lmm_common(D_WARNING, lmm);
 206                 return -EINVAL;
 207         }
 208
 209         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 210 }
 211
 212 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 213                            struct lov_mds_md_v1 *lmm)
 214 {
 215         struct lov_oinfo *loi;
 216         int i;
 217         int stripe_count;
 218         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 219
 220         lsm_unpackmd_common(lsm, lmm);
 221
 222         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 223
 224         for (i = 0; i < stripe_count; i++) {
 225                 /* XXX LOV STACKING call down to osc_unpackmd() */
 226                 loi = lsm->lsm_oinfo[i];
 227                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 228                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 229                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 230                 if (lov_oinfo_is_dummy(loi))
 231                         continue;
 232
 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         if (lsm->lsm_stripe_count == 0)
 251                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 252
 253         return 0;
 254 }
 255
 256 const struct lsm_operations lsm_v1_ops = {
 257         .lsm_free           = lsm_free_plain,
 258         .lsm_destroy     = lsm_destroy_plain,
 259         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 260         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 261         .lsm_lmm_verify  = lsm_lmm_verify_v1,
 262         .lsm_unpackmd      = lsm_unpackmd_v1,
 263 };
 264
 265 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 266                              __u16 *stripe_count)
 267 {
 268         struct lov_mds_md_v3 *lmm;
 269
 270         lmm = (struct lov_mds_md_v3 *)lmmv1;
 271
 272         if (lmm_bytes < sizeof(*lmm)) {
 273                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 274                        lmm_bytes, (int)sizeof(*lmm));
 275                 return -EINVAL;
 276         }
 277
 278         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 279         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 280                 *stripe_count = 0;
 281
 282         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 283                 CERROR("LOV EA V3 too small: %d, need %d\n",
 284                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 285                 lov_dump_lmm_common(D_WARNING, lmm);
 286                 return -EINVAL;
 287         }
 288
 289         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 290                                      *stripe_count);
 291 }
 292
 293 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 294                            struct lov_mds_md *lmmv1)
 295 {
 296         struct lov_mds_md_v3 *lmm;
 297         struct lov_oinfo *loi;
 298         int i;
 299         int stripe_count;
 300         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 301         int cplen = 0;
 302
 303         lmm = (struct lov_mds_md_v3 *)lmmv1;
 304
 305         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 306
 307         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 308
 309         cplen = strlcpy(lsm->lsm_pool_name, lmm->lmm_pool_name,
 310                         sizeof(lsm->lsm_pool_name));
 311         if (cplen >= sizeof(lsm->lsm_pool_name))
 312                 return -E2BIG;
 313
 314         for (i = 0; i < stripe_count; i++) {
 315                 /* XXX LOV STACKING call down to osc_unpackmd() */
 316                 loi = lsm->lsm_oinfo[i];
 317                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 318                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 319                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 320                 if (lov_oinfo_is_dummy(loi))
 321                         continue;
 322
 323                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 324                         CERROR("OST index %d more than OST count %d\n",
 325                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 326                         lov_dump_lmm_v3(D_WARNING, lmm);
 327                         return -EINVAL;
 328                 }
 329                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 330                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 331                         lov_dump_lmm_v3(D_WARNING, lmm);
 332                         return -EINVAL;
 333                 }
 334                 /* calculate the minimum stripe max bytes */
 335                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 336                                  &stripe_maxbytes);
 337         }
 338
 339         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 340         if (lsm->lsm_stripe_count == 0)
 341                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 342
 343         return 0;
 344 }
 345
 346 const struct lsm_operations lsm_v3_ops = {
 347         .lsm_free           = lsm_free_plain,
 348         .lsm_destroy     = lsm_destroy_plain,
 349         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 350         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 351         .lsm_lmm_verify  = lsm_lmm_verify_v3,
 352         .lsm_unpackmd      = lsm_unpackmd_v3,
 353 };
 354
 355 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 356 {
 357         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",
 358                lsm,
 359                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 360                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 361                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 362                lsm->lsm_pool_name);
 363 }