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) &
  70              (LOV_MIN_STRIPE_SIZE - 1)) != 0) {
  71                 CERROR("bad stripe size %u\n",
  72                        le32_to_cpu(lmm->lmm_stripe_size));
  73                 lov_dump_lmm_common(D_WARNING, lmm);
  74                 return -EINVAL;
  75         }
  76         return 0;
  77 }
  78
  79 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  80 {
  81         struct lov_stripe_md *lsm;
  82         struct lov_oinfo     *loi;
  83         int                i, oinfo_ptrs_size;
  84
  85         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  86
  87         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
  88         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
  89
  90         lsm = libcfs_kvzalloc(*size, GFP_NOFS);
  91         if (!lsm)
  92                 return NULL;
  93
  94         for (i = 0; i < stripe_count; i++) {
  95                 loi = kmem_cache_zalloc(lov_oinfo_slab, GFP_NOFS);
  96                 if (!loi)
  97                         goto err;
  98                 lsm->lsm_oinfo[i] = loi;
  99         }
 100         lsm->lsm_stripe_count = stripe_count;
 101         return lsm;
 102
 103 err:
 104         while (--i >= 0)
 105                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 106         kvfree(lsm);
 107         return NULL;
 108 }
 109
 110 void lsm_free_plain(struct lov_stripe_md *lsm)
 111 {
 112         __u16 stripe_count = lsm->lsm_stripe_count;
 113         int i;
 114
 115         for (i = 0; i < stripe_count; i++)
 116                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 117         kvfree(lsm);
 118 }
 119
 120 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 121                                 struct lov_mds_md *lmm)
 122 {
 123         /*
 124          * This supposes lov_mds_md_v1/v3 first fields are
 125          * are the same
 126          */
 127         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 128         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 129         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 130         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 131         lsm->lsm_pool_name[0] = '\0';
 132 }
 133
 134 static void
 135 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 136                           u64 *lov_off, u64 *swidth)
 137 {
 138         if (swidth)
 139                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 140 }
 141
 142 static void
 143 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 144                            u64 *lov_off, u64 *swidth)
 145 {
 146         if (swidth)
 147                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 148 }
 149
 150 /* Find minimum stripe maxbytes value.  For inactive or
 151  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES.
 152  */
 153 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 154 {
 155         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 156
 157         if (!imp || !tgt->ltd_active) {
 158                 *stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 159                 return;
 160         }
 161
 162         spin_lock(&imp->imp_lock);
 163         if (imp->imp_state == LUSTRE_IMP_FULL &&
 164             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 165             imp->imp_connect_data.ocd_maxbytes > 0) {
 166                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 167                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 168         } else {
 169                 *stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 170         }
 171         spin_unlock(&imp->imp_lock);
 172 }
 173
 174 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 175                              __u16 *stripe_count)
 176 {
 177         if (lmm_bytes < sizeof(*lmm)) {
 178                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 179                        lmm_bytes, (int)sizeof(*lmm));
 180                 return -EINVAL;
 181         }
 182
 183         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 184         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 185                 *stripe_count = 0;
 186
 187         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 188                 CERROR("LOV EA V1 too small: %d, need %d\n",
 189                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 190                 lov_dump_lmm_common(D_WARNING, lmm);
 191                 return -EINVAL;
 192         }
 193
 194         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 195 }
 196
 197 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 198                            struct lov_mds_md_v1 *lmm)
 199 {
 200         struct lov_oinfo *loi;
 201         int i;
 202         int stripe_count;
 203         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 204
 205         lsm_unpackmd_common(lsm, lmm);
 206
 207         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 208
 209         for (i = 0; i < stripe_count; i++) {
 210                 /* XXX LOV STACKING call down to osc_unpackmd() */
 211                 loi = lsm->lsm_oinfo[i];
 212                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 213                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 214                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 215                 if (lov_oinfo_is_dummy(loi))
 216                         continue;
 217
 218                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 219                         CERROR("OST index %d more than OST count %d\n",
 220                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 221                         lov_dump_lmm_v1(D_WARNING, lmm);
 222                         return -EINVAL;
 223                 }
 224                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 225                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 226                         lov_dump_lmm_v1(D_WARNING, lmm);
 227                         return -EINVAL;
 228                 }
 229                 /* calculate the minimum stripe max bytes */
 230                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 231                                  &stripe_maxbytes);
 232         }
 233
 234         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 235         if (lsm->lsm_stripe_count == 0)
 236                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 237
 238         return 0;
 239 }
 240
 241 const struct lsm_operations lsm_v1_ops = {
 242         .lsm_free           = lsm_free_plain,
 243         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 244         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 245         .lsm_lmm_verify  = lsm_lmm_verify_v1,
 246         .lsm_unpackmd      = lsm_unpackmd_v1,
 247 };
 248
 249 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 250                              __u16 *stripe_count)
 251 {
 252         struct lov_mds_md_v3 *lmm;
 253
 254         lmm = (struct lov_mds_md_v3 *)lmmv1;
 255
 256         if (lmm_bytes < sizeof(*lmm)) {
 257                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 258                        lmm_bytes, (int)sizeof(*lmm));
 259                 return -EINVAL;
 260         }
 261
 262         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 263         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 264                 *stripe_count = 0;
 265
 266         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 267                 CERROR("LOV EA V3 too small: %d, need %d\n",
 268                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 269                 lov_dump_lmm_common(D_WARNING, lmm);
 270                 return -EINVAL;
 271         }
 272
 273         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 274                                      *stripe_count);
 275 }
 276
 277 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 278                            struct lov_mds_md *lmmv1)
 279 {
 280         struct lov_mds_md_v3 *lmm;
 281         struct lov_oinfo *loi;
 282         int i;
 283         int stripe_count;
 284         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 285         int cplen = 0;
 286
 287         lmm = (struct lov_mds_md_v3 *)lmmv1;
 288
 289         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 290
 291         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 292
 293         cplen = strlcpy(lsm->lsm_pool_name, lmm->lmm_pool_name,
 294                         sizeof(lsm->lsm_pool_name));
 295         if (cplen >= sizeof(lsm->lsm_pool_name))
 296                 return -E2BIG;
 297
 298         for (i = 0; i < stripe_count; i++) {
 299                 /* XXX LOV STACKING call down to osc_unpackmd() */
 300                 loi = lsm->lsm_oinfo[i];
 301                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 302                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 303                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 304                 if (lov_oinfo_is_dummy(loi))
 305                         continue;
 306
 307                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 308                         CERROR("OST index %d more than OST count %d\n",
 309                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 310                         lov_dump_lmm_v3(D_WARNING, lmm);
 311                         return -EINVAL;
 312                 }
 313                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 314                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 315                         lov_dump_lmm_v3(D_WARNING, lmm);
 316                         return -EINVAL;
 317                 }
 318                 /* calculate the minimum stripe max bytes */
 319                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 320                                  &stripe_maxbytes);
 321         }
 322
 323         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 324         if (lsm->lsm_stripe_count == 0)
 325                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 326
 327         return 0;
 328 }
 329
 330 const struct lsm_operations lsm_v3_ops = {
 331         .lsm_free           = lsm_free_plain,
 332         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 333         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 334         .lsm_lmm_verify  = lsm_lmm_verify_v3,
 335         .lsm_unpackmd      = lsm_unpackmd_v3,
 336 };
 337
 338 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 339 {
 340         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",
 341                lsm,
 342                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 343                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 344                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 345                lsm->lsm_pool_name);
 346 }