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, 2014, 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 <linux/math64.h>
  44 #include <libcfs/libcfs.h>
  45
  46 #include <obd_class.h>
  47 #include <lustre/lustre_idl.h>
  48
  49 #include "lov_internal.h"
  50
  51 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
  52                                  __u16 stripe_count)
  53 {
  54         if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
  55                 CERROR("bad stripe count %d\n", stripe_count);
  56                 lov_dump_lmm_common(D_WARNING, lmm);
  57                 return -EINVAL;
  58         }
  59
  60         if (lmm_oi_id(&lmm->lmm_oi) == 0) {
  61                 CERROR("zero object id\n");
  62                 lov_dump_lmm_common(D_WARNING, lmm);
  63                 return -EINVAL;
  64         }
  65
  66         if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
  67                 CERROR("bad striping pattern\n");
  68                 lov_dump_lmm_common(D_WARNING, lmm);
  69                 return -EINVAL;
  70         }
  71
  72         if (lmm->lmm_stripe_size == 0 ||
  73             (le32_to_cpu(lmm->lmm_stripe_size)&(LOV_MIN_STRIPE_SIZE-1)) != 0) {
  74                 CERROR("bad stripe size %u\n",
  75                        le32_to_cpu(lmm->lmm_stripe_size));
  76                 lov_dump_lmm_common(D_WARNING, lmm);
  77                 return -EINVAL;
  78         }
  79         return 0;
  80 }
  81
  82 struct lov_stripe_md *lsm_alloc_plain(__u16 stripe_count, int *size)
  83 {
  84         struct lov_stripe_md *lsm;
  85         struct lov_oinfo     *loi;
  86         int                   i, oinfo_ptrs_size;
  87
  88         LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);
  89
  90         oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
  91         *size = sizeof(struct lov_stripe_md) + oinfo_ptrs_size;
  92
  93         OBD_ALLOC_LARGE(lsm, *size);
  94         if (!lsm)
  95                 return NULL;
  96
  97         for (i = 0; i < stripe_count; i++) {
  98                 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
  99                 if (loi == NULL)
 100                         goto err;
 101                 lsm->lsm_oinfo[i] = loi;
 102         }
 103         lsm->lsm_stripe_count = stripe_count;
 104         return lsm;
 105
 106 err:
 107         while (--i >= 0)
 108                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab, sizeof(*loi));
 109         OBD_FREE_LARGE(lsm, *size);
 110         return NULL;
 111 }
 112
 113 void lsm_free_plain(struct lov_stripe_md *lsm)
 114 {
 115         __u16 stripe_count = lsm->lsm_stripe_count;
 116         int i;
 117
 118         for (i = 0; i < stripe_count; i++)
 119                 OBD_SLAB_FREE(lsm->lsm_oinfo[i], lov_oinfo_slab,
 120                               sizeof(struct lov_oinfo));
 121         OBD_FREE_LARGE(lsm, sizeof(struct lov_stripe_md) +
 122                        stripe_count * sizeof(struct lov_oinfo *));
 123 }
 124
 125 /* Find minimum stripe maxbytes value.  For inactive or
 126  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES. */
 127 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
 128 {
 129         struct obd_import *imp;
 130         loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 131
 132         if (!tgt->ltd_active)
 133                 return maxbytes;
 134
 135         imp = tgt->ltd_obd->u.cli.cl_import;
 136         if (imp == NULL)
 137                 return maxbytes;
 138
 139         spin_lock(&imp->imp_lock);
 140         if (imp->imp_state == LUSTRE_IMP_FULL &&
 141             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 142             imp->imp_connect_data.ocd_maxbytes > 0)
 143                 maxbytes = imp->imp_connect_data.ocd_maxbytes;
 144
 145         spin_unlock(&imp->imp_lock);
 146
 147         return maxbytes;
 148 }
 149
 150 static int lsm_unpackmd_common(struct lov_obd *lov,
 151                                struct lov_stripe_md *lsm,
 152                                struct lov_mds_md *lmm,
 153                                struct lov_ost_data_v1 *objects)
 154 {
 155         struct lov_oinfo *loi;
 156         loff_t stripe_maxbytes = LLONG_MAX;
 157         unsigned int stripe_count;
 158         unsigned int i;
 159
 160         /*
 161          * This supposes lov_mds_md_v1/v3 first fields are
 162          * are the same
 163          */
 164         lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 165         lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 166         lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 167         lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 168         lsm->lsm_pool_name[0] = '\0';
 169
 170         stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;
 171
 172         for (i = 0; i < stripe_count; i++) {
 173                 loi = lsm->lsm_oinfo[i];
 174                 ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 175                 loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 176                 loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 177                 if (lov_oinfo_is_dummy(loi))
 178                         continue;
 179
 180                 if (loi->loi_ost_idx >= lov->desc.ld_tgt_count) {
 181                         CERROR("OST index %d more than OST count %d\n",
 182                                loi->loi_ost_idx, lov->desc.ld_tgt_count);
 183                         lov_dump_lmm_v1(D_WARNING, lmm);
 184                         return -EINVAL;
 185                 }
 186
 187                 if (!lov->lov_tgts[loi->loi_ost_idx]) {
 188                         CERROR("OST index %d missing\n", loi->loi_ost_idx);
 189                         lov_dump_lmm_v1(D_WARNING, lmm);
 190                         return -EINVAL;
 191                 }
 192
 193                 stripe_maxbytes = min_t(loff_t, stripe_maxbytes,
 194                                         lov_tgt_maxbytes(
 195                                         lov->lov_tgts[loi->loi_ost_idx]));
 196         }
 197
 198         if (stripe_maxbytes == LLONG_MAX)
 199                 stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 200
 201         if (lsm->lsm_stripe_count == 0)
 202                 lsm->lsm_maxbytes = stripe_maxbytes * lov->desc.ld_tgt_count;
 203         else
 204                 lsm->lsm_maxbytes = stripe_maxbytes * lsm->lsm_stripe_count;
 205
 206         return 0;
 207 }
 208
 209 static void
 210 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 211                           loff_t *lov_off, loff_t *swidth)
 212 {
 213         if (swidth != NULL)
 214                 *swidth = (loff_t)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 215 }
 216
 217 static void
 218 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 219                            loff_t *lov_off, loff_t *swidth)
 220 {
 221         if (swidth != NULL)
 222                 *swidth = (loff_t)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 223 }
 224
 225 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 226                              __u16 *stripe_count)
 227 {
 228         if (lmm_bytes < sizeof(*lmm)) {
 229                 CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 230                        lmm_bytes, (int)sizeof(*lmm));
 231                 return -EINVAL;
 232         }
 233
 234         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 235         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 236                 *stripe_count = 0;
 237
 238         if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 239                 CERROR("LOV EA V1 too small: %d, need %d\n",
 240                        lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 241                 lov_dump_lmm_common(D_WARNING, lmm);
 242                 return -EINVAL;
 243         }
 244
 245         return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 246 }
 247
 248 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 249                            struct lov_mds_md_v1 *lmm)
 250 {
 251         return lsm_unpackmd_common(lov, lsm, lmm, lmm->lmm_objects);
 252 }
 253
 254 const struct lsm_operations lsm_v1_ops = {
 255         .lsm_free            = lsm_free_plain,
 256         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 257         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 258         .lsm_lmm_verify         = lsm_lmm_verify_v1,
 259         .lsm_unpackmd           = lsm_unpackmd_v1,
 260 };
 261
 262 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 263                              __u16 *stripe_count)
 264 {
 265         struct lov_mds_md_v3 *lmm;
 266
 267         lmm = (struct lov_mds_md_v3 *)lmmv1;
 268
 269         if (lmm_bytes < sizeof(*lmm)) {
 270                 CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 271                        lmm_bytes, (int)sizeof(*lmm));
 272                 return -EINVAL;
 273         }
 274
 275         *stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 276         if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 277                 *stripe_count = 0;
 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_common(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 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 291                            struct lov_mds_md *lmm)
 292 {
 293         struct lov_mds_md_v3 *lmm_v3 = (struct lov_mds_md_v3 *)lmm;
 294         size_t cplen;
 295         int rc;
 296
 297         rc = lsm_unpackmd_common(lov, lsm, lmm, lmm_v3->lmm_objects);
 298         if (rc != 0)
 299                 return rc;
 300
 301         cplen = strlcpy(lsm->lsm_pool_name, lmm_v3->lmm_pool_name,
 302                         sizeof(lsm->lsm_pool_name));
 303         if (cplen >= sizeof(lsm->lsm_pool_name))
 304                 return -E2BIG;
 305
 306         return 0;
 307 }
 308
 309 const struct lsm_operations lsm_v3_ops = {
 310         .lsm_free            = lsm_free_plain,
 311         .lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 312         .lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 313         .lsm_lmm_verify         = lsm_lmm_verify_v3,
 314         .lsm_unpackmd           = lsm_unpackmd_v3,
 315 };
 316
 317 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 318 {
 319         CDEBUG(level, "lsm %p, objid "DOSTID", maxbytes "LPX64", magic 0x%08X,"
 320                " stripe_size %u, stripe_count %u, refc: %d,"
 321                " layout_gen %u, pool ["LOV_POOLNAMEF"]\n", lsm,
 322                POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 323                lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 324                atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 325                lsm->lsm_pool_name);
 326 }