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 <linux/libcfs/libcfs.h>
  41
  42 #include <obd_class.h>
  43 #include <uapi/linux/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)
  80 {
  81         size_t oinfo_ptrs_size, lsm_size;
  82         struct lov_stripe_md *lsm;
  83         struct lov_oinfo     *loi;
  84         int i;
  85
  86         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  87
  88         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
  89         lsm_size = sizeof(*lsm) + oinfo_ptrs_size;
  90
  91         lsm = libcfs_kvzalloc(lsm_size, GFP_NOFS);
  92         if (!lsm)
  93                 return NULL;
  94
  95         for (i = 0; i < stripe_count; i++) {
  96                 loi = kmem_cache_zalloc(lov_oinfo_slab, GFP_NOFS);
  97                 if (!loi)
  98                         goto err;
  99                 lsm->lsm_oinfo[i] = loi;
 100         }
 101         lsm->lsm_stripe_count = stripe_count;
 102         return lsm;
 103
 104 err:
 105         while (--i >= 0)
 106                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 107         kvfree(lsm);
 108         return NULL;
 109 }
 110
 111 void lsm_free_plain(struct lov_stripe_md *lsm)
 112 {
 113         __u16 stripe_count = lsm->lsm_stripe_count;
 114         int i;
 115
 116         for (i = 0; i < stripe_count; i++)
 117                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 118         kvfree(lsm);
 119 }
 120
 121 /*
 122  * Find minimum stripe maxbytes value.  For inactive or
 123  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES.
 124  */
 125 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
 126 {
 127         loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 128         struct obd_import *imp;
 129
 130         if (!tgt->ltd_active)
 131                 return maxbytes;
 132
 133         imp = tgt->ltd_obd->u.cli.cl_import;
 134         if (!imp)
 135                 return maxbytes;
 136
 137         spin_lock(&imp->imp_lock);
 138         if (imp->imp_state == LUSTRE_IMP_FULL &&
 139             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 140              imp->imp_connect_data.ocd_maxbytes > 0)
 141                 maxbytes = imp->imp_connect_data.ocd_maxbytes;
 142
 143         spin_unlock(&imp->imp_lock);
 144
 145         return maxbytes;
 146 }
 147
 148 static int lsm_unpackmd_common(struct lov_obd *lov,
 149                                struct lov_stripe_md *lsm,
 150                                struct lov_mds_md *lmm,
 151                                struct lov_ost_data_v1 *objects)
 152 {
 153         loff_t min_stripe_maxbytes = 0;
 154         unsigned int stripe_count;
 155         struct lov_oinfo *loi;
 156         loff_t lov_bytes;
 157         unsigned int i;
 158
 159         /*
 160          * This supposes lov_mds_md_v1/v3 first fields are
 161          * are the same
 162          */
 163         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 164         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 165         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 166         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 167         lsm->lsm_pool_name[0] = '\0';
 168
 169         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 170
 171         for (i = 0; i < stripe_count; i++) {
 172                 loi = lsm->lsm_oinfo[i];
 173                 ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 174                 loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 175                 loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 176                 if (lov_oinfo_is_dummy(loi))
 177                         continue;
 178
 179                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
 180                     !lov2obd(lov)->obd_process_conf) {
 181                         CERROR("%s: OST index %d more than OST count %d\n",
 182                                (char *)lov->desc.ld_uuid.uuid,
 183                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 184                         lov_dump_lmm_v1(D_WARNING, lmm);
 185                         return -EINVAL;
 186                 }
 187
 188                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 189                         CERROR("%s: OST index %d missing\n",
 190                                (char *)lov->desc.ld_uuid.uuid,
 191                                loi->loi_ost_idx);
 192                         lov_dump_lmm_v1(D_WARNING, lmm);
 193                         continue;
 194                 }
 195
 196                 lov_bytes = lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx]);
 197                 if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
 198                         min_stripe_maxbytes = lov_bytes;
 199         }
 200
 201         if (min_stripe_maxbytes == 0)
 202                 min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 203
 204         stripe_count = lsm->lsm_stripe_count ?: lov->desc.ld_tgt_count;
 205         lov_bytes = min_stripe_maxbytes * stripe_count;
 206
 207         if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
 208                 lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
 209         else
 210                 lsm->lsm_maxbytes = lov_bytes;
 211
 212         return 0;
 213 }
 214
 215 static void
 216 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 217                           loff_t *lov_off, loff_t *swidth)
 218 {
 219         if (swidth)
 220                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 221 }
 222
 223 static void
 224 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 225                            loff_t *lov_off, loff_t *swidth)
 226 {
 227         if (swidth)
 228                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 229 }
 230
 231 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 232                              __u16 *stripe_count)
 233 {
 234         if (lmm_bytes < sizeof(*lmm)) {
 235                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 236                        lmm_bytes, (int)sizeof(*lmm));
 237                 return -EINVAL;
 238         }
 239
 240         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 241         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 242                 *stripe_count = 0;
 243
 244         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 245                 CERROR("LOV EA V1 too small: %d, need %d\n",
 246                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 247                 lov_dump_lmm_common(D_WARNING, lmm);
 248                 return -EINVAL;
 249         }
 250
 251         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 252 }
 253
 254 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 255                            struct lov_mds_md_v1 *lmm)
 256 {
 257         return lsm_unpackmd_common(lov, lsm, lmm, lmm->lmm_objects);
 258 }
 259
 260 const struct lsm_operations lsm_v1_ops = {
 261         .lsm_free           = lsm_free_plain,
 262         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 263         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 264         .lsm_lmm_verify  = lsm_lmm_verify_v1,
 265         .lsm_unpackmd      = lsm_unpackmd_v1,
 266 };
 267
 268 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 269                              __u16 *stripe_count)
 270 {
 271         struct lov_mds_md_v3 *lmm;
 272
 273         lmm = (struct lov_mds_md_v3 *)lmmv1;
 274
 275         if (lmm_bytes < sizeof(*lmm)) {
 276                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 277                        lmm_bytes, (int)sizeof(*lmm));
 278                 return -EINVAL;
 279         }
 280
 281         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 282         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 283                 *stripe_count = 0;
 284
 285         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 286                 CERROR("LOV EA V3 too small: %d, need %d\n",
 287                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 288                 lov_dump_lmm_common(D_WARNING, lmm);
 289                 return -EINVAL;
 290         }
 291
 292         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 293                                      *stripe_count);
 294 }
 295
 296 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 297                            struct lov_mds_md *lmm)
 298 {
 299         struct lov_mds_md_v3 *lmm_v3 = (struct lov_mds_md_v3 *)lmm;
 300         size_t cplen = 0;
 301         int rc;
 302
 303         rc = lsm_unpackmd_common(lov, lsm, lmm, lmm_v3->lmm_objects);
 304         if (rc)
 305                 return rc;
 306
 307         cplen = strlcpy(lsm->lsm_pool_name, lmm_v3->lmm_pool_name,
 308                         sizeof(lsm->lsm_pool_name));
 309         if (cplen >= sizeof(lsm->lsm_pool_name))
 310                 return -E2BIG;
 311
 312         return 0;
 313 }
 314
 315 const struct lsm_operations lsm_v3_ops = {
 316         .lsm_free           = lsm_free_plain,
 317         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 318         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 319         .lsm_lmm_verify  = lsm_lmm_verify_v3,
 320         .lsm_unpackmd      = lsm_unpackmd_v3,
 321 };
 322
 323 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 324 {
 325         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",
 326                lsm,
 327                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 328                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 329                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 330                lsm->lsm_pool_name);
 331 }