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, Whamcloud, Inc.
  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 #include <lustre_log.h>
  54
  55 #include "lov_internal.h"
  56
  57 struct lovea_unpack_args {
  58         struct lov_stripe_md *lsm;
  59         int                   cursor;
  60 };
  61
  62 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
  63                                  __u16 stripe_count)
  64 {
  65
  66         if (stripe_count == 0 || stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  67                 CERROR("bad stripe count %d\n", stripe_count);
  68                 lov_dump_lmm(D_WARNING, lmm);
  69                 return -EINVAL;
  70         }
  71
  72         if (lmm->lmm_object_id == 0) {
  73                 CERROR("zero object id\n");
  74                 lov_dump_lmm(D_WARNING, lmm);
  75                 return -EINVAL;
  76         }
  77
  78         if (lmm->lmm_pattern != cpu_to_le32(LOV_PATTERN_RAID0)) {
  79                 CERROR("bad striping pattern\n");
  80                 lov_dump_lmm(D_WARNING, lmm);
  81                 return -EINVAL;
  82         }
  83
  84         if (lmm->lmm_stripe_size == 0 ||
  85              (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  86                 CERROR("bad stripe size %u\n",
  87                        le32_to_cpu(lmm->lmm_stripe_size));
  88                 lov_dump_lmm(D_WARNING, lmm);
  89                 return -EINVAL;
  90         }
  91         return 0;
  92 }
  93
  94 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  95 {
  96         struct lov_stripe_md *lsm;
  97         struct lov_oinfo     *loi;
  98         int                   i, oinfo_ptrs_size;
  99
 100         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
 101
 102         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
 103         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
 104
 105         OBD_ALLOC_LARGE(lsm, *size);
 106         if (!lsm)
 107                 return NULL;;
 108
 109         for (i = 0; i < stripe_count; i++) {
 110                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, CFS_ALLOC_IO);
 111                 if (loi == NULL)
 112                         goto err;
 113                 lsm->lsm_oinfo[i] = loi;
 114         }
 115         lsm->lsm_stripe_count = stripe_count;
 116         return lsm;
 117
 118 err:
 119         while (--i >= 0)
 120                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab, sizeof(*loi));
 121         OBD_FREE_LARGE(lsm, *size);
 122         return NULL;
 123 }
 124
 125 void lsm_free_plain(struct lov_stripe_md *lsm)
 126 {
 127         __u16 stripe_count = lsm->lsm_stripe_count;
 128         int i;
 129
 130         for (i = 0; i < stripe_count; i++)
 131                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab,
 132                               sizeof(struct lov_oinfo));
 133         OBD_FREE_LARGE(lsm, sizeof(struct lov_stripe_md) +
 134                        stripe_count * sizeof(struct lov_oinfo *));
 135 }
 136
 137 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 138                                 struct lov_mds_md *lmm)
 139 {
 140         /*
 141          * This supposes lov_mds_md_v1/v3 first fields are
 142          * are the same
 143          */
 144         lsm->lsm_object_id = le64_to_cpu(lmm->lmm_object_id);
 145         lsm->lsm_object_seq = le64_to_cpu(lmm->lmm_object_seq);
 146         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 147         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 148         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 149         lsm->lsm_pool_name[0] = '\0';
 150 }
 151
 152 static void
 153 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 154                            obd_off *lov_off, obd_off *swidth)
 155 {
 156         if (swidth)
 157                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 158 }
 159
 160 static void
 161 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 162                            obd_off *lov_off, obd_off *swidth)
 163 {
 164         if (swidth)
 165                 *swidth = (obd_off)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 166 }
 167
 168 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 169                              struct obd_export *md_exp)
 170 {
 171         return 0;
 172 }
 173
 174 /* Find minimum stripe maxbytes value.  For inactive or
 175  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 176 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 177 {
 178         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 179
 180         if (imp == NULL || !tgt->ltd_active) {
 181                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 182                 return;
 183         }
 184
 185         cfs_spin_lock(&imp->imp_lock);
 186         if (imp->imp_state == LUSTRE_IMP_FULL &&
 187            (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 188            imp->imp_connect_data.ocd_maxbytes > 0) {
 189                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 190                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 191         } else {
 192                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 193         }
 194         cfs_spin_unlock(&imp->imp_lock);
 195 }
 196
 197 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 198                              __u16 *stripe_count)
 199 {
 200         if (lmm_bytes < sizeof(*lmm)) {
 201                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 202                        lmm_bytes, (int)sizeof(*lmm));
 203                 return -EINVAL;
 204         }
 205
 206         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 207
 208         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 209                 CERROR("LOV EA V1 too small: %d, need %d\n",
 210                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 211                 lov_dump_lmm_v1(D_WARNING, lmm);
 212                 return -EINVAL;
 213         }
 214
 215         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 216 }
 217
 218 int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 219                     struct lov_mds_md_v1 *lmm)
 220 {
 221         struct lov_oinfo *loi;
 222         int i;
 223         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 224
 225         lsm_unpackmd_common(lsm, lmm);
 226
 227         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 228                 /* XXX LOV STACKING call down to osc_unpackmd() */
 229                 loi = lsm->lsm_oinfo[i];
 230                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 231                 loi->loi_seq = le64_to_cpu(lmm->lmm_objects[i].l_object_seq);
 232                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 233                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 234                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 235                         CERROR("OST index %d more than OST count %d\n",
 236                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 237                         lov_dump_lmm_v1(D_WARNING, lmm);
 238                         return -EINVAL;
 239                 }
 240                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 241                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 242                         lov_dump_lmm_v1(D_WARNING, lmm);
 243                         return -EINVAL;
 244                 }
 245                 /* calculate the minimum stripe max bytes */
 246                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 247                                  &stripe_maxbytes);
 248         }
 249
 250         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 251
 252         return 0;
 253 }
 254
 255 const struct lsm_operations lsm_v1_ops = {
 256         .lsm_free            = lsm_free_plain,
 257         .lsm_destroy         = lsm_destroy_plain,
 258         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 259         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 260         .lsm_lmm_verify         = lsm_lmm_verify_v1,
 261         .lsm_unpackmd           = lsm_unpackmd_v1,
 262 };
 263
 264 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 265                              __u16 *stripe_count)
 266 {
 267         struct lov_mds_md_v3 *lmm;
 268
 269         lmm = (struct lov_mds_md_v3 *)lmmv1;
 270
 271         if (lmm_bytes < sizeof(*lmm)) {
 272                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 273                        lmm_bytes, (int)sizeof(*lmm));
 274                 return -EINVAL;
 275         }
 276
 277         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 278
 279         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 280                 CERROR("LOV EA V3 too small: %d, need %d\n",
 281                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 282                 lov_dump_lmm_v3(D_WARNING, lmm);
 283                 return -EINVAL;
 284         }
 285
 286         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 287                                      *stripe_count);
 288 }
 289
 290 int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 291                     struct lov_mds_md *lmmv1)
 292 {
 293         struct lov_mds_md_v3 *lmm;
 294         struct lov_oinfo *loi;
 295         int i;
 296         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 297
 298         lmm = (struct lov_mds_md_v3 *)lmmv1;
 299
 300         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 301         strncpy(lsm->lsm_pool_name, lmm->lmm_pool_name, LOV_MAXPOOLNAME);
 302
 303         for (i = 0; i < lsm->lsm_stripe_count; i++) {
 304                 /* XXX LOV STACKING call down to osc_unpackmd() */
 305                 loi = lsm->lsm_oinfo[i];
 306                 loi->loi_id = le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 307                 loi->loi_seq = le64_to_cpu(lmm->lmm_objects[i].l_object_seq);
 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 (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 311                         CERROR("OST index %d more than OST count %d\n",
 312                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 313                         lov_dump_lmm_v3(D_WARNING, lmm);
 314                         return -EINVAL;
 315                 }
 316                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 317                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 318                         lov_dump_lmm_v3(D_WARNING, lmm);
 319                         return -EINVAL;
 320                 }
 321                 /* calculate the minimum stripe max bytes */
 322                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 323                                  &stripe_maxbytes);
 324         }
 325
 326         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 327
 328         return 0;
 329 }
 330
 331 const struct lsm_operations lsm_v3_ops = {
 332         .lsm_free            = lsm_free_plain,
 333         .lsm_destroy         = lsm_destroy_plain,
 334         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 335         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 336         .lsm_lmm_verify         = lsm_lmm_verify_v3,
 337         .lsm_unpackmd           = lsm_unpackmd_v3,
 338 };
 339