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         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  65                 CERROR("bad stripe count %d\n", stripe_count);
  66                 lov_dump_lmm_common(D_WARNING, lmm);
  67                 return -EINVAL;
  68         }
  69
  70         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  71                 CERROR("zero object id\n");
  72                 lov_dump_lmm_common(D_WARNING, lmm);
  73                 return -EINVAL;
  74         }
  75
  76         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  77                 CERROR("bad striping pattern\n");
  78                 lov_dump_lmm_common(D_WARNING, lmm);
  79                 return -EINVAL;
  80         }
  81
  82         if (lmm->lmm_stripe_size == 0 ||
  83             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  84                 CERROR("bad stripe size %u\n",
  85                        le32_to_cpu(lmm->lmm_stripe_size));
  86                 lov_dump_lmm_common(D_WARNING, lmm);
  87                 return -EINVAL;
  88         }
  89         return 0;
  90 }
  91
  92 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  93 {
  94         struct lov_stripe_md *lsm;
  95         struct lov_oinfo     *loi;
  96         int                   i, oinfo_ptrs_size;
  97
  98         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  99
 100         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
 101         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
 102
 103         OBD_ALLOC_LARGE(lsm, *size);
 104         if (!lsm)
 105                 return NULL;;
 106
 107         for (i = 0; i < stripe_count; i++) {
 108                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, __GFP_IO);
 109                 if (loi == NULL)
 110                         goto err;
 111                 lsm->lsm_oinfo[i] = loi;
 112         }
 113         lsm->lsm_stripe_count = stripe_count;
 114         return lsm;
 115
 116 err:
 117         while (--i >= 0)
 118                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab, sizeof(*loi));
 119         OBD_FREE_LARGE(lsm, *size);
 120         return NULL;
 121 }
 122
 123 void lsm_free_plain(struct lov_stripe_md *lsm)
 124 {
 125         __u16 stripe_count = lsm->lsm_stripe_count;
 126         int i;
 127
 128         for (i = 0; i < stripe_count; i++)
 129                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab,
 130                               sizeof(struct lov_oinfo));
 131         OBD_FREE_LARGE(lsm, sizeof(struct lov_stripe_md) +
 132                        stripe_count * sizeof(struct lov_oinfo *));
 133 }
 134
 135 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 136                                 struct lov_mds_md *lmm)
 137 {
 138         /*
 139          * This supposes lov_mds_md_v1/v3 first fields are
 140          * are the same
 141          */
 142         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 143         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 144         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 145         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 146         lsm->lsm_pool_name[0] = '\0';
 147 }
 148
 149 static void
 150 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 151                            obd_off *lov_off, obd_off *swidth)
 152 {
 153         if (swidth)
 154                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 155 }
 156
 157 static void
 158 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 159                            obd_off *lov_off, obd_off *swidth)
 160 {
 161         if (swidth)
 162                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 163 }
 164
 165 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 166                              struct obd_export *md_exp)
 167 {
 168         return 0;
 169 }
 170
 171 /* Find minimum stripe maxbytes value.  For inactive or
 172  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 173 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 174 {
 175         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 176
 177         if (imp == NULL || !tgt->ltd_active) {
 178                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 179                 return;
 180         }
 181
 182         spin_lock(&imp->imp_lock);
 183         if (imp->imp_state == LUSTRE_IMP_FULL &&
 184             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 185             imp->imp_connect_data.ocd_maxbytes > 0) {
 186                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 187                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 188         } else {
 189                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 190         }
 191         spin_unlock(&imp->imp_lock);
 192 }
 193
 194 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 195                              __u16 *stripe_count)
 196 {
 197         if (lmm_bytes < sizeof(*lmm)) {
 198                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 199                        lmm_bytes, (int)sizeof(*lmm));
 200                 return -EINVAL;
 201         }
 202
 203         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 204         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 205                 *stripe_count = 0;
 206
 207         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 208                 CERROR("LOV EA V1 too small: %d, need %d\n",
 209                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 210                 lov_dump_lmm_common(D_WARNING, lmm);
 211                 return -EINVAL;
 212         }
 213
 214         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 215 }
 216
 217 int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 218                     struct lov_mds_md_v1 *lmm)
 219 {
 220         struct lov_oinfo *loi;
 221         int i;
 222         int stripe_count;
 223         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 224
 225         lsm_unpackmd_common(lsm, lmm);
 226
 227         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 228
 229         for (i = 0; i < stripe_count; i++) {
 230                 /* XXX LOV STACKING call down to osc_unpackmd() */
 231                 loi = lsm->lsm_oinfo[i];
 232                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 233                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 234                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 235                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 236                         CERROR("OST index %d more than OST count %d\n",
 237                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 238                         lov_dump_lmm_v1(D_WARNING, lmm);
 239                         return -EINVAL;
 240                 }
 241                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 242                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 243                         lov_dump_lmm_v1(D_WARNING, lmm);
 244                         return -EINVAL;
 245                 }
 246                 /* calculate the minimum stripe max bytes */
 247                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 248                                  &stripe_maxbytes);
 249         }
 250
 251         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 252         if (lsm->lsm_stripe_count == 0)
 253                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 254
 255         return 0;
 256 }
 257
 258 const struct lsm_operations lsm_v1_ops = {
 259         .lsm_free            = lsm_free_plain,
 260         .lsm_destroy         = lsm_destroy_plain,
 261         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 262         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 263         .lsm_lmm_verify         = lsm_lmm_verify_v1,
 264         .lsm_unpackmd           = lsm_unpackmd_v1,
 265 };
 266
 267 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 268                              __u16 *stripe_count)
 269 {
 270         struct lov_mds_md_v3 *lmm;
 271
 272         lmm = (struct lov_mds_md_v3 *)lmmv1;
 273
 274         if (lmm_bytes < sizeof(*lmm)) {
 275                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 276                        lmm_bytes, (int)sizeof(*lmm));
 277                 return -EINVAL;
 278         }
 279
 280         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 281         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 282                 *stripe_count = 0;
 283
 284         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 285                 CERROR("LOV EA V3 too small: %d, need %d\n",
 286                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 287                 lov_dump_lmm_common(D_WARNING, lmm);
 288                 return -EINVAL;
 289         }
 290
 291         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 292                                      *stripe_count);
 293 }
 294
 295 int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 296                     struct lov_mds_md *lmmv1)
 297 {
 298         struct lov_mds_md_v3 *lmm;
 299         struct lov_oinfo *loi;
 300         int i;
 301         int stripe_count;
 302         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 303         int cplen = 0;
 304
 305         lmm = (struct lov_mds_md_v3 *)lmmv1;
 306
 307         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 308
 309         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 310
 311         cplen = strlcpy(lsm->lsm_pool_name, lmm->lmm_pool_name,
 312                         sizeof(lsm->lsm_pool_name));
 313         if (cplen >= sizeof(lsm->lsm_pool_name))
 314                 return -E2BIG;
 315
 316         for (i = 0; i < stripe_count; i++) {
 317                 /* XXX LOV STACKING call down to osc_unpackmd() */
 318                 loi = lsm->lsm_oinfo[i];
 319                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 320                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 321                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 322                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 323                         CERROR("OST index %d more than OST count %d\n",
 324                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 325                         lov_dump_lmm_v3(D_WARNING, lmm);
 326                         return -EINVAL;
 327                 }
 328                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 329                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 330                         lov_dump_lmm_v3(D_WARNING, lmm);
 331                         return -EINVAL;
 332                 }
 333                 /* calculate the minimum stripe max bytes */
 334                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 335                                  &stripe_maxbytes);
 336         }
 337
 338         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 339         if (lsm->lsm_stripe_count == 0)
 340                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 341
 342         return 0;
 343 }
 344
 345 const struct lsm_operations lsm_v3_ops = {
 346         .lsm_free            = lsm_free_plain,
 347         .lsm_destroy         = lsm_destroy_plain,
 348         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 349         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 350         .lsm_lmm_verify         = lsm_lmm_verify_v3,
 351         .lsm_unpackmd           = lsm_unpackmd_v3,
 352 };
 353