lustre/include/lustre_lmv.h

   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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2014, 2016, Intel Corporation.
  24  */
  25 /*
  26  * lustre/include/lustre_lmv.h
  27  *
  28  * Lustre LMV structures and functions.
  29  *
  30  * Author: Di Wang <di.wang@intel.com>
  31  */
  32
  33 #ifndef _LUSTRE_LMV_H
  34 #define _LUSTRE_LMV_H
  35 #include <uapi/linux/lustre/lustre_idl.h>
  36
  37 struct lmv_oinfo {
  38         struct lu_fid   lmo_fid;
  39         u32             lmo_mds;
  40         struct inode    *lmo_root;
  41 };
  42
  43 struct lmv_stripe_md {
  44         __u32   lsm_md_magic;
  45         __u32   lsm_md_stripe_count;
  46         __u32   lsm_md_master_mdt_index;
  47         __u32   lsm_md_hash_type;
  48         __u8    lsm_md_max_inherit;
  49         __u8    lsm_md_max_inherit_rr;
  50         __u32   lsm_md_layout_version;
  51         __u32   lsm_md_migrate_offset;
  52         __u32   lsm_md_migrate_hash;
  53         char    lsm_md_pool_name[LOV_MAXPOOLNAME + 1];
  54         struct lmv_oinfo lsm_md_oinfo[0];
  55 };
  56
  57 struct lmv_stripe_object {
  58         atomic_t                        lso_refs;
  59         union {
  60                 struct lmv_stripe_md    lso_lsm;
  61                 struct lmv_foreign_md   lso_lfm;
  62         };
  63 };
  64
  65 static inline bool lmv_dir_striped(const struct lmv_stripe_object *lso)
  66 {
  67         return lso && lso->lso_lsm.lsm_md_magic == LMV_MAGIC;
  68 }
  69
  70 static inline bool lmv_dir_foreign(const struct lmv_stripe_object *lso)
  71 {
  72         return lso && lso->lso_lsm.lsm_md_magic == LMV_MAGIC_FOREIGN;
  73 }
  74
  75 static inline bool lmv_dir_layout_changing(const struct lmv_stripe_object *lso)
  76 {
  77         return lmv_dir_striped(lso) &&
  78                lmv_hash_is_layout_changing(lso->lso_lsm.lsm_md_hash_type);
  79 }
  80
  81 static inline bool lmv_dir_bad_hash(const struct lmv_stripe_object *lso)
  82 {
  83         if (!lmv_dir_striped(lso))
  84                 return false;
  85
  86         if (lso->lso_lsm.lsm_md_hash_type & LMV_HASH_FLAG_BAD_TYPE)
  87                 return true;
  88
  89         return !lmv_is_known_hash_type(lso->lso_lsm.lsm_md_hash_type);
  90 }
  91
  92 static inline __u8 lmv_inherit_next(__u8 inherit)
  93 {
  94         if (inherit == LMV_INHERIT_END || inherit == LMV_INHERIT_NONE)
  95                 return LMV_INHERIT_NONE;
  96
  97         if (inherit == LMV_INHERIT_UNLIMITED || inherit > LMV_INHERIT_MAX)
  98                 return inherit;
  99
 100         return inherit - 1;
 101 }
 102
 103 static inline __u8 lmv_inherit_rr_next(__u8 inherit_rr)
 104 {
 105         if (inherit_rr == LMV_INHERIT_RR_NONE ||
 106             inherit_rr == LMV_INHERIT_RR_UNLIMITED ||
 107             inherit_rr > LMV_INHERIT_RR_MAX)
 108                 return inherit_rr;
 109
 110         return inherit_rr - 1;
 111 }
 112
 113 static inline bool lmv_is_inheritable(__u8 inherit)
 114 {
 115         return inherit == LMV_INHERIT_UNLIMITED ||
 116                (inherit > LMV_INHERIT_END && inherit <= LMV_INHERIT_MAX);
 117 }
 118
 119 static inline bool lsm_md_eq(const struct lmv_stripe_object *lso1,
 120                              const struct lmv_stripe_object *lso2)
 121 {
 122         const struct lmv_stripe_md *lsm1 = &lso1->lso_lsm;
 123         const struct lmv_stripe_md *lsm2 = &lso2->lso_lsm;
 124         __u32 idx;
 125
 126         if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
 127             lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
 128             lsm1->lsm_md_master_mdt_index !=
 129                                 lsm2->lsm_md_master_mdt_index ||
 130             lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
 131             lsm1->lsm_md_max_inherit != lsm2->lsm_md_max_inherit ||
 132             lsm1->lsm_md_max_inherit_rr != lsm2->lsm_md_max_inherit_rr ||
 133             lsm1->lsm_md_layout_version !=
 134                                 lsm2->lsm_md_layout_version ||
 135             lsm1->lsm_md_migrate_offset !=
 136                                 lsm2->lsm_md_migrate_offset ||
 137             lsm1->lsm_md_migrate_hash !=
 138                                 lsm2->lsm_md_migrate_hash ||
 139             strncmp(lsm1->lsm_md_pool_name, lsm2->lsm_md_pool_name,
 140                     sizeof(lsm1->lsm_md_pool_name)) != 0)
 141                 return false;
 142
 143         if (lmv_dir_striped(lso1)) {
 144                 for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
 145                         if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
 146                                        &lsm2->lsm_md_oinfo[idx].lmo_fid))
 147                                 return false;
 148                 }
 149         } else if (lsm1->lsm_md_magic == LMV_USER_MAGIC_SPECIFIC) {
 150                 for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
 151                         if (lsm1->lsm_md_oinfo[idx].lmo_mds !=
 152                             lsm2->lsm_md_oinfo[idx].lmo_mds)
 153                                 return false;
 154                 }
 155         }
 156
 157         return true;
 158 }
 159
 160 static inline void
 161 lmv_stripe_object_dump(int mask, const struct lmv_stripe_object *lsmo)
 162 {
 163         const struct lmv_stripe_md *lsm = &lsmo->lso_lsm;
 164         int i;
 165
 166         CDEBUG(mask,
 167                "dump LMV: refs %u magic=%#x count=%u index=%u hash=%s:%#x max_inherit=%hhu max_inherit_rr=%hhu version=%u migrate_offset=%u migrate_hash=%s:%x pool=%.*s\n",
 168                lsm->lsm_md_magic, atomic_read(&lsmo->lso_refs),
 169                lsm->lsm_md_stripe_count, lsm->lsm_md_master_mdt_index,
 170                lmv_is_known_hash_type(lsm->lsm_md_hash_type) ?
 171                 mdt_hash_name[lsm->lsm_md_hash_type & LMV_HASH_TYPE_MASK] :
 172                 "invalid", lsm->lsm_md_hash_type,
 173                lsm->lsm_md_max_inherit, lsm->lsm_md_max_inherit_rr,
 174                lsm->lsm_md_layout_version, lsm->lsm_md_migrate_offset,
 175                lmv_is_known_hash_type(lsm->lsm_md_migrate_hash) ?
 176                 mdt_hash_name[lsm->lsm_md_migrate_hash & LMV_HASH_TYPE_MASK] :
 177                 "invalid", lsm->lsm_md_migrate_hash,
 178                LOV_MAXPOOLNAME, lsm->lsm_md_pool_name);
 179
 180         if (!lmv_dir_striped(lsmo))
 181                 return;
 182
 183         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
 184                 CDEBUG_LIMIT(mask, "stripe[%d] "DFID"\n",
 185                              i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
 186 }
 187
 188 static inline bool
 189 lmv_object_inherited(const struct lmv_stripe_object *plsm,
 190                      const struct lmv_stripe_object *clsm)
 191 {
 192         return plsm && clsm &&
 193                plsm->lso_lsm.lsm_md_magic ==
 194                         clsm->lso_lsm.lsm_md_magic &&
 195                plsm->lso_lsm.lsm_md_stripe_count ==
 196                         clsm->lso_lsm.lsm_md_stripe_count &&
 197                plsm->lso_lsm.lsm_md_master_mdt_index ==
 198                         clsm->lso_lsm.lsm_md_master_mdt_index &&
 199                plsm->lso_lsm.lsm_md_hash_type ==
 200                         clsm->lso_lsm.lsm_md_hash_type &&
 201                lmv_inherit_next(plsm->lso_lsm.lsm_md_max_inherit) ==
 202                         clsm->lso_lsm.lsm_md_max_inherit &&
 203                lmv_inherit_rr_next(plsm->lso_lsm.lsm_md_max_inherit_rr) ==
 204                         clsm->lso_lsm.lsm_md_max_inherit_rr;
 205 }
 206
 207 union lmv_mds_md;
 208
 209 struct lmv_stripe_object *lmv_stripe_object_alloc(__u32 magic,
 210                                                   const union lmv_mds_md *lmm,
 211                                                   size_t lmm_size);
 212
 213 void lmv_stripe_object_put(struct lmv_stripe_object **lsm_obj);
 214
 215 struct lmv_stripe_object *
 216         lmv_stripe_object_get(struct lmv_stripe_object *lsm_obj);
 217
 218 static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
 219                                   const struct lmv_mds_md_v1 *lmv_src)
 220 {
 221         __u32 i;
 222
 223         lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
 224         lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
 225         lmv_dst->lmv_master_mdt_index =
 226                                 le32_to_cpu(lmv_src->lmv_master_mdt_index);
 227         lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
 228         lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
 229         if (lmv_src->lmv_stripe_count > LMV_MAX_STRIPE_COUNT)
 230                 return;
 231         for (i = 0; i < lmv_src->lmv_stripe_count; i++)
 232                 fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
 233                               &lmv_src->lmv_stripe_fids[i]);
 234 }
 235
 236 static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
 237                                  const union lmv_mds_md *lmv_src)
 238 {
 239         switch (le32_to_cpu(lmv_src->lmv_magic)) {
 240         case LMV_MAGIC_V1:
 241                 lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
 242                 break;
 243         default:
 244                 break;
 245         }
 246 }
 247
 248 /* This hash is only for testing purpose */
 249 static inline unsigned int
 250 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
 251 {
 252         unsigned int c = 0;
 253         const unsigned char *p = (const unsigned char *)name;
 254
 255         while (--namelen >= 0)
 256                 c += p[namelen];
 257
 258         c = c % count;
 259
 260         return c;
 261 }
 262
 263 static inline unsigned int
 264 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
 265 {
 266         __u64 hash;
 267
 268         hash = lustre_hash_fnv_1a_64(name, namelen);
 269
 270         return do_div(hash, count);
 271 }
 272
 273 /*
 274  * Robert Jenkins' function for mixing 32-bit values
 275  * http://burtleburtle.net/bob/hash/evahash.html
 276  * a, b = random bits, c = input and output
 277  *
 278  * Mixing inputs to generate an evenly distributed hash.
 279  */
 280 #define crush_hashmix(a, b, c)                          \
 281 do {                                                    \
 282         a = a - b;  a = a - c;  a = a ^ (c >> 13);      \
 283         b = b - c;  b = b - a;  b = b ^ (a << 8);       \
 284         c = c - a;  c = c - b;  c = c ^ (b >> 13);      \
 285         a = a - b;  a = a - c;  a = a ^ (c >> 12);      \
 286         b = b - c;  b = b - a;  b = b ^ (a << 16);      \
 287         c = c - a;  c = c - b;  c = c ^ (b >> 5);       \
 288         a = a - b;  a = a - c;  a = a ^ (c >> 3);       \
 289         b = b - c;  b = b - a;  b = b ^ (a << 10);      \
 290         c = c - a;  c = c - b;  c = c ^ (b >> 15);      \
 291 } while (0)
 292
 293 #define crush_hash_seed 1315423911
 294
 295 static inline __u32 crush_hash(__u32 a, __u32 b)
 296 {
 297         __u32 hash = crush_hash_seed ^ a ^ b;
 298         __u32 x = 231232;
 299         __u32 y = 1232;
 300
 301         crush_hashmix(a, b, hash);
 302         crush_hashmix(x, a, hash);
 303         crush_hashmix(b, y, hash);
 304
 305         return hash;
 306 }
 307
 308 /* refer to https://github.com/ceph/ceph/blob/master/src/crush/hash.c and
 309  * https://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf for details of CRUSH
 310  * algorithm.
 311  */
 312 static inline unsigned int
 313 lmv_hash_crush(unsigned int count, const char *name, int namelen, bool crush2)
 314 {
 315         unsigned long long straw;
 316         unsigned long long highest_straw = 0;
 317         unsigned int pg_id;
 318         unsigned int idx = 0;
 319         int i;
 320
 321         /* put temp and backup file on the same MDT where target is located.
 322          * temporary file naming rule:
 323          * 1. rsync: .<target>.XXXXXX
 324          * 2. dstripe: <target>.XXXXXXXX
 325          */
 326         if (lu_name_is_temp_file(name, namelen, true, 6, crush2)) {
 327                 name++;
 328                 namelen -= 8;
 329         } else if (lu_name_is_temp_file(name, namelen, false, 8, crush2)) {
 330                 namelen -= 9;
 331         } else if (lu_name_is_backup_file(name, namelen, &i)) {
 332                 LASSERT(i < namelen);
 333                 namelen -= i;
 334         }
 335
 336         pg_id = lmv_hash_fnv1a(LMV_CRUSH_PG_COUNT, name, namelen);
 337
 338         /* distribute PG among all stripes pseudo-randomly, so they are almost
 339          * evenly distributed, and when stripe count changes, only (delta /
 340          * total) sub files need to be moved, herein 'delta' is added or removed
 341          * stripe count, 'total' is total stripe count before change for
 342          * removal, or count after change for addition.
 343          */
 344         for (i = 0; i < count; i++) {
 345                 straw = crush_hash(pg_id, i);
 346                 if (straw > highest_straw) {
 347                         highest_straw = straw;
 348                         idx = i;
 349                 }
 350         }
 351         LASSERT(idx < count);
 352
 353         return idx;
 354 }
 355
 356 /* directory layout may change in three ways:
 357  * 1. directory migration, in its LMV source stripes are appended after
 358  *    target stripes, \a migrate_hash is source hash type, \a migrate_offset is
 359  *    target stripe count,
 360  * 2. directory split, \a migrate_hash is hash type before split,
 361  *    \a migrate_offset is stripe count before split.
 362  * 3. directory merge, \a migrate_hash is hash type after merge,
 363  *    \a migrate_offset is stripe count after merge.
 364  */
 365 static inline int
 366 __lmv_name_to_stripe_index(__u32 hash_type, __u32 stripe_count,
 367                            __u32 migrate_hash, __u32 migrate_offset,
 368                            const char *name, int namelen, bool new_layout)
 369 {
 370         __u32 saved_hash = hash_type;
 371         __u32 saved_count = stripe_count;
 372         int stripe_index = 0;
 373
 374         LASSERT(namelen > 0);
 375         LASSERT(stripe_count > 0);
 376
 377         if (lmv_hash_is_splitting(hash_type)) {
 378                 if (!new_layout) {
 379                         hash_type = migrate_hash;
 380                         stripe_count = migrate_offset;
 381                 }
 382         } else if (lmv_hash_is_merging(hash_type)) {
 383                 if (new_layout) {
 384                         hash_type = migrate_hash;
 385                         stripe_count = migrate_offset;
 386                 }
 387         } else if (lmv_hash_is_migrating(hash_type)) {
 388                 if (new_layout) {
 389                         stripe_count = migrate_offset;
 390                 } else {
 391                         hash_type = migrate_hash;
 392                         stripe_count -= migrate_offset;
 393                 }
 394         }
 395
 396         if (stripe_count > 1) {
 397                 switch (hash_type & LMV_HASH_TYPE_MASK) {
 398                 case LMV_HASH_TYPE_ALL_CHARS:
 399                         stripe_index = lmv_hash_all_chars(stripe_count, name,
 400                                                           namelen);
 401                         break;
 402                 case LMV_HASH_TYPE_FNV_1A_64:
 403                         stripe_index = lmv_hash_fnv1a(stripe_count, name,
 404                                                       namelen);
 405                         break;
 406                 case LMV_HASH_TYPE_CRUSH:
 407                         stripe_index = lmv_hash_crush(stripe_count, name,
 408                                                       namelen, false);
 409                         break;
 410                 case LMV_HASH_TYPE_CRUSH2:
 411                         stripe_index = lmv_hash_crush(stripe_count, name,
 412                                                       namelen, true);
 413                         break;
 414                 default:
 415                         return -EBADFD;
 416                 }
 417         }
 418
 419         LASSERT(stripe_index < stripe_count);
 420
 421         if (!new_layout && lmv_hash_is_migrating(saved_hash))
 422                 stripe_index += migrate_offset;
 423
 424         LASSERT(stripe_index < saved_count);
 425
 426         CDEBUG(D_INFO, "name %.*s hash=%#x/%#x idx=%d/%u/%u under %s layout\n",
 427                namelen, name, saved_hash, migrate_hash, stripe_index,
 428                saved_count, migrate_offset, new_layout ? "new" : "old");
 429
 430         return stripe_index;
 431 }
 432
 433 static inline int lmv_name_to_stripe_index(struct lmv_mds_md_v1 *lmv,
 434                                            const char *name, int namelen)
 435 {
 436         if (lmv->lmv_magic == LMV_MAGIC_V1 ||
 437             lmv->lmv_magic == LMV_MAGIC_STRIPE)
 438                 return __lmv_name_to_stripe_index(lmv->lmv_hash_type,
 439                                                   lmv->lmv_stripe_count,
 440                                                   lmv->lmv_migrate_hash,
 441                                                   lmv->lmv_migrate_offset,
 442                                                   name, namelen, true);
 443
 444         if (lmv->lmv_magic == cpu_to_le32(LMV_MAGIC_V1) ||
 445             lmv->lmv_magic == cpu_to_le32(LMV_MAGIC_STRIPE))
 446                 return __lmv_name_to_stripe_index(
 447                                         le32_to_cpu(lmv->lmv_hash_type),
 448                                         le32_to_cpu(lmv->lmv_stripe_count),
 449                                         le32_to_cpu(lmv->lmv_migrate_hash),
 450                                         le32_to_cpu(lmv->lmv_migrate_offset),
 451                                         name, namelen, true);
 452
 453         return -EINVAL;
 454 }
 455
 456 static inline int lmv_name_to_stripe_index_old(struct lmv_mds_md_v1 *lmv,
 457                                                const char *name, int namelen)
 458 {
 459         if (lmv->lmv_magic == LMV_MAGIC_V1 ||
 460             lmv->lmv_magic == LMV_MAGIC_STRIPE)
 461                 return __lmv_name_to_stripe_index(lmv->lmv_hash_type,
 462                                                   lmv->lmv_stripe_count,
 463                                                   lmv->lmv_migrate_hash,
 464                                                   lmv->lmv_migrate_offset,
 465                                                   name, namelen, false);
 466
 467         if (lmv->lmv_magic == cpu_to_le32(LMV_MAGIC_V1) ||
 468             lmv->lmv_magic == cpu_to_le32(LMV_MAGIC_STRIPE))
 469                 return __lmv_name_to_stripe_index(
 470                                         le32_to_cpu(lmv->lmv_hash_type),
 471                                         le32_to_cpu(lmv->lmv_stripe_count),
 472                                         le32_to_cpu(lmv->lmv_migrate_hash),
 473                                         le32_to_cpu(lmv->lmv_migrate_offset),
 474                                         name, namelen, false);
 475
 476         return -EINVAL;
 477 }
 478
 479 static inline bool lmv_user_magic_supported(__u32 lum_magic)
 480 {
 481         return lum_magic == LMV_USER_MAGIC ||
 482                lum_magic == LMV_USER_MAGIC_SPECIFIC ||
 483                lum_magic == LMV_MAGIC_FOREIGN;
 484 }
 485
 486 #define LMV_DEBUG(mask, lmv, msg)                                             \
 487         CDEBUG_LIMIT(mask,                                                    \
 488                "%s LMV: magic=%#x count=%u index=%u hash=%s:%#x version=%u migrate_offset=%u migrate_hash=%s:%x pool=%.*s\n",\
 489                msg, (lmv)->lmv_magic, (lmv)->lmv_stripe_count,                \
 490                (lmv)->lmv_master_mdt_index,                                   \
 491                lmv_is_known_hash_type((lmv)->lmv_hash_type) ?                 \
 492                 mdt_hash_name[(lmv)->lmv_hash_type & LMV_HASH_TYPE_MASK] :    \
 493                 "invalid", (lmv)->lmv_hash_type,                              \
 494                (lmv)->lmv_layout_version, (lmv)->lmv_migrate_offset,          \
 495                lmv_is_known_hash_type((lmv)->lmv_migrate_hash) ?              \
 496                 mdt_hash_name[(lmv)->lmv_migrate_hash & LMV_HASH_TYPE_MASK] : \
 497                 "invalid", (lmv)->lmv_migrate_hash,                           \
 498                LOV_MAXPOOLNAME, lmv->lmv_pool_name)
 499
 500 /* master LMV is sane */
 501 static inline bool lmv_is_sane(const struct lmv_mds_md_v1 *lmv)
 502 {
 503         if (!lmv)
 504                 return false;
 505
 506         if (le32_to_cpu(lmv->lmv_magic) != LMV_MAGIC_V1)
 507                 goto insane;
 508
 509         if (le32_to_cpu(lmv->lmv_stripe_count) == 0)
 510                 goto insane;
 511
 512         if (!lmv_is_sane_hash_type(le32_to_cpu(lmv->lmv_hash_type)))
 513                 goto insane;
 514
 515         return true;
 516 insane:
 517         LMV_DEBUG(D_ERROR, lmv, "unknown layout");
 518         return false;
 519 }
 520
 521 /* LMV can be either master or stripe LMV */
 522 static inline bool lmv_is_sane2(const struct lmv_mds_md_v1 *lmv)
 523 {
 524         if (!lmv)
 525                 return false;
 526
 527         if (le32_to_cpu(lmv->lmv_magic) != LMV_MAGIC_V1 &&
 528             le32_to_cpu(lmv->lmv_magic) != LMV_MAGIC_STRIPE)
 529                 goto insane;
 530
 531         if (le32_to_cpu(lmv->lmv_stripe_count) == 0)
 532                 goto insane;
 533
 534         if (!lmv_is_sane_hash_type(le32_to_cpu(lmv->lmv_hash_type)))
 535                 goto insane;
 536
 537         return true;
 538 insane:
 539         LMV_DEBUG(D_ERROR, lmv, "unknown layout");
 540         return false;
 541 }
 542
 543 static inline bool lmv_is_splitting(const struct lmv_mds_md_v1 *lmv)
 544 {
 545         if (!lmv_is_sane2(lmv))
 546                 return false;
 547
 548         return lmv_hash_is_splitting(cpu_to_le32(lmv->lmv_hash_type));
 549 }
 550
 551 static inline bool lmv_is_merging(const struct lmv_mds_md_v1 *lmv)
 552 {
 553         if (!lmv_is_sane2(lmv))
 554                 return false;
 555
 556         return lmv_hash_is_merging(cpu_to_le32(lmv->lmv_hash_type));
 557 }
 558
 559 static inline bool lmv_is_migrating(const struct lmv_mds_md_v1 *lmv)
 560 {
 561         if (!lmv_is_sane(lmv))
 562                 return false;
 563
 564         return lmv_hash_is_migrating(cpu_to_le32(lmv->lmv_hash_type));
 565 }
 566
 567 static inline bool lmv_is_restriping(const struct lmv_mds_md_v1 *lmv)
 568 {
 569         if (!lmv_is_sane2(lmv))
 570                 return false;
 571
 572         return lmv_hash_is_splitting(cpu_to_le32(lmv->lmv_hash_type)) ||
 573                lmv_hash_is_merging(cpu_to_le32(lmv->lmv_hash_type));
 574 }
 575
 576 static inline bool lmv_is_layout_changing(const struct lmv_mds_md_v1 *lmv)
 577 {
 578         if (!lmv_is_sane2(lmv))
 579                 return false;
 580
 581         return lmv_hash_is_splitting(cpu_to_le32(lmv->lmv_hash_type)) ||
 582                lmv_hash_is_merging(cpu_to_le32(lmv->lmv_hash_type)) ||
 583                lmv_hash_is_migrating(cpu_to_le32(lmv->lmv_hash_type));
 584 }
 585
 586 static inline bool lmv_is_fixed(const struct lmv_mds_md_v1 *lmv)
 587 {
 588         return cpu_to_le32(lmv->lmv_hash_type) & LMV_HASH_FLAG_FIXED;
 589 }
 590
 591 #endif