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         lsm = libcfs_kvzalloc(*size, GFP_NOFS);
  99         if (!lsm)
 100                 return NULL;
 101
 102         for (i = 0; i < stripe_count; i++) {
 103                 loi = kmem_cache_alloc(lov_oinfo_slab, GFP_NOFS | __GFP_ZERO);
 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                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 114         kvfree(lsm);
 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                 kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 125         kvfree(lsm);
 126 }
 127
 128 static void lsm_unpackmd_common(struct lov_stripe_md *lsm,
 129                                 struct lov_mds_md *lmm)
 130 {
 131         /*
 132          * This supposes lov_mds_md_v1/v3 first fields are
 133          * are the same
 134          */
 135         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 136         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 137         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 138         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 139         lsm->lsm_pool_name[0] = '\0';
 140 }
 141
 142 static void
 143 lsm_stripe_by_index_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 static void
 151 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 152                            u64 *lov_off, u64 *swidth)
 153 {
 154         if (swidth)
 155                 *swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 156 }
 157
 158 static int lsm_destroy_plain(struct lov_stripe_md *lsm, struct obdo *oa,
 159                              struct obd_export *md_exp)
 160 {
 161         return 0;
 162 }
 163
 164 /* Find minimum stripe maxbytes value.  For inactive or
 165  * reconnecting targets use LUSTRE_STRIPE_MAXBYTES. */
 166 static void lov_tgt_maxbytes(struct lov_tgt_desc *tgt, __u64 *stripe_maxbytes)
 167 {
 168         struct obd_import *imp = tgt->ltd_obd->u.cli.cl_import;
 169
 170         if (imp == NULL || !tgt->ltd_active) {
 171                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 172                 return;
 173         }
 174
 175         spin_lock(&imp->imp_lock);
 176         if (imp->imp_state == LUSTRE_IMP_FULL &&
 177             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 178             imp->imp_connect_data.ocd_maxbytes > 0) {
 179                 if (*stripe_maxbytes > imp->imp_connect_data.ocd_maxbytes)
 180                         *stripe_maxbytes = imp->imp_connect_data.ocd_maxbytes;
 181         } else {
 182                 *stripe_maxbytes = LUSTRE_STRIPE_MAXBYTES;
 183         }
 184         spin_unlock(&imp->imp_lock);
 185 }
 186
 187 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 188                              __u16 *stripe_count)
 189 {
 190         if (lmm_bytes < sizeof(*lmm)) {
 191                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 192                        lmm_bytes, (int)sizeof(*lmm));
 193                 return -EINVAL;
 194         }
 195
 196         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 197         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 198                 *stripe_count = 0;
 199
 200         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 201                 CERROR("LOV EA V1 too small: %d, need %d\n",
 202                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 203                 lov_dump_lmm_common(D_WARNING, lmm);
 204                 return -EINVAL;
 205         }
 206
 207         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 208 }
 209
 210 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 211                            struct lov_mds_md_v1 *lmm)
 212 {
 213         struct lov_oinfo *loi;
 214         int i;
 215         int stripe_count;
 216         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 217
 218         lsm_unpackmd_common(lsm, lmm);
 219
 220         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 221
 222         for (i = 0; i < stripe_count; i++) {
 223                 /* XXX LOV STACKING call down to osc_unpackmd() */
 224                 loi = lsm->lsm_oinfo[i];
 225                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 226                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 227                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 228                 if (lov_oinfo_is_dummy(loi))
 229                         continue;
 230
 231                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 232                         CERROR("OST index %d more than OST count %d\n",
 233                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 234                         lov_dump_lmm_v1(D_WARNING, lmm);
 235                         return -EINVAL;
 236                 }
 237                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 238                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 239                         lov_dump_lmm_v1(D_WARNING, lmm);
 240                         return -EINVAL;
 241                 }
 242                 /* calculate the minimum stripe max bytes */
 243                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 244                                  &stripe_maxbytes);
 245         }
 246
 247         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 248         if (lsm->lsm_stripe_count == 0)
 249                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 250
 251         return 0;
 252 }
 253
 254 const struct lsm_operations lsm_v1_ops = {
 255         .lsm_free           = lsm_free_plain,
 256         .lsm_destroy     = lsm_destroy_plain,
 257         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 258         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 259         .lsm_lmm_verify  = lsm_lmm_verify_v1,
 260         .lsm_unpackmd      = lsm_unpackmd_v1,
 261 };
 262
 263 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 264                              __u16 *stripe_count)
 265 {
 266         struct lov_mds_md_v3 *lmm;
 267
 268         lmm = (struct lov_mds_md_v3 *)lmmv1;
 269
 270         if (lmm_bytes < sizeof(*lmm)) {
 271                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 272                        lmm_bytes, (int)sizeof(*lmm));
 273                 return -EINVAL;
 274         }
 275
 276         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 277         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 278                 *stripe_count = 0;
 279
 280         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 281                 CERROR("LOV EA V3 too small: %d, need %d\n",
 282                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 283                 lov_dump_lmm_common(D_WARNING, lmm);
 284                 return -EINVAL;
 285         }
 286
 287         return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 288                                      *stripe_count);
 289 }
 290
 291 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 292                            struct lov_mds_md *lmmv1)
 293 {
 294         struct lov_mds_md_v3 *lmm;
 295         struct lov_oinfo *loi;
 296         int i;
 297         int stripe_count;
 298         __u64 stripe_maxbytes = OBD_OBJECT_EOF;
 299         int cplen = 0;
 300
 301         lmm = (struct lov_mds_md_v3 *)lmmv1;
 302
 303         lsm_unpackmd_common(lsm, (struct lov_mds_md_v1 *)lmm);
 304
 305         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 306
 307         cplen = strlcpy(lsm->lsm_pool_name, lmm->lmm_pool_name,
 308                         sizeof(lsm->lsm_pool_name));
 309         if (cplen >= sizeof(lsm->lsm_pool_name))
 310                 return -E2BIG;
 311
 312         for (i = 0; i < stripe_count; i++) {
 313                 /* XXX LOV STACKING call down to osc_unpackmd() */
 314                 loi = lsm->lsm_oinfo[i];
 315                 ostid_le_to_cpu(&lmm->lmm_objects[i].l_ost_oi, &loi->loi_oi);
 316                 loi->loi_ost_idx = le32_to_cpu(lmm->lmm_objects[i].l_ost_idx);
 317                 loi->loi_ost_gen = le32_to_cpu(lmm->lmm_objects[i].l_ost_gen);
 318                 if (lov_oinfo_is_dummy(loi))
 319                         continue;
 320
 321                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 322                         CERROR("OST index %d more than OST count %d\n",
 323                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 324                         lov_dump_lmm_v3(D_WARNING, lmm);
 325                         return -EINVAL;
 326                 }
 327                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 328                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 329                         lov_dump_lmm_v3(D_WARNING, lmm);
 330                         return -EINVAL;
 331                 }
 332                 /* calculate the minimum stripe max bytes */
 333                 lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx],
 334                                  &stripe_maxbytes);
 335         }
 336
 337         lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 338         if (lsm->lsm_stripe_count == 0)
 339                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 340
 341         return 0;
 342 }
 343
 344 const struct lsm_operations lsm_v3_ops = {
 345         .lsm_free           = lsm_free_plain,
 346         .lsm_destroy     = lsm_destroy_plain,
 347         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 348         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 349         .lsm_lmm_verify  = lsm_lmm_verify_v3,
 350         .lsm_unpackmd      = lsm_unpackmd_v3,
 351 };
 352
 353 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 354 {
 355         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",
 356                lsm,
 357                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 358                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 359                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 360                lsm->lsm_pool_name);
 361 }