git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/fs-io-direct.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #ifndef NO_BCACHEFS_FS
   3
   4 #include "bcachefs.h"
   5 #include "alloc_foreground.h"
   6 #include "fs.h"
   7 #include "fs-io.h"
   8 #include "fs-io-direct.h"
   9 #include "fs-io-pagecache.h"
  10 #include "io_read.h"
  11 #include "io_write.h"
  12
  13 #include <linux/kthread.h>
  14 #include <linux/pagemap.h>
  15 #include <linux/prefetch.h>
  16 #include <linux/task_io_accounting_ops.h>
  17
  18 /* O_DIRECT reads */
  19
  20 struct dio_read {
  21         struct closure                  cl;
  22         struct kiocb                    *req;
  23         long                            ret;
  24         bool                            should_dirty;
  25         struct bch_read_bio             rbio;
  26 };
  27
  28 static void bio_check_or_release(struct bio *bio, bool check_dirty)
  29 {
  30         if (check_dirty) {
  31                 bio_check_pages_dirty(bio);
  32         } else {
  33                 bio_release_pages(bio, false);
  34                 bio_put(bio);
  35         }
  36 }
  37
  38 static CLOSURE_CALLBACK(bch2_dio_read_complete)
  39 {
  40         closure_type(dio, struct dio_read, cl);
  41
  42         dio->req->ki_complete(dio->req, dio->ret);
  43         bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
  44 }
  45
  46 static void bch2_direct_IO_read_endio(struct bio *bio)
  47 {
  48         struct dio_read *dio = bio->bi_private;
  49
  50         if (bio->bi_status)
  51                 dio->ret = blk_status_to_errno(bio->bi_status);
  52
  53         closure_put(&dio->cl);
  54 }
  55
  56 static void bch2_direct_IO_read_split_endio(struct bio *bio)
  57 {
  58         struct dio_read *dio = bio->bi_private;
  59         bool should_dirty = dio->should_dirty;
  60
  61         bch2_direct_IO_read_endio(bio);
  62         bio_check_or_release(bio, should_dirty);
  63 }
  64
  65 static int bch2_direct_IO_read(struct kiocb *req, struct iov_iter *iter)
  66 {
  67         struct file *file = req->ki_filp;
  68         struct bch_inode_info *inode = file_bch_inode(file);
  69         struct bch_fs *c = inode->v.i_sb->s_fs_info;
  70         struct bch_io_opts opts;
  71         struct dio_read *dio;
  72         struct bio *bio;
  73         loff_t offset = req->ki_pos;
  74         bool sync = is_sync_kiocb(req);
  75         size_t shorten;
  76         ssize_t ret;
  77
  78         bch2_inode_opts_get(&opts, c, &inode->ei_inode);
  79
  80         ret = min_t(loff_t, iter->count,
  81                     max_t(loff_t, 0, i_size_read(&inode->v) - offset));
  82
  83         if (!ret)
  84                 return ret;
  85
  86         shorten = iov_iter_count(iter) - round_up(ret, block_bytes(c));
  87         iter->count -= shorten;
  88
  89         bio = bio_alloc_bioset(NULL,
  90                                bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
  91                                REQ_OP_READ,
  92                                GFP_KERNEL,
  93                                &c->dio_read_bioset);
  94
  95         bio->bi_end_io = bch2_direct_IO_read_endio;
  96
  97         dio = container_of(bio, struct dio_read, rbio.bio);
  98         closure_init(&dio->cl, NULL);
  99
 100         /*
 101          * this is a _really_ horrible hack just to avoid an atomic sub at the
 102          * end:
 103          */
 104         if (!sync) {
 105                 set_closure_fn(&dio->cl, bch2_dio_read_complete, NULL);
 106                 atomic_set(&dio->cl.remaining,
 107                            CLOSURE_REMAINING_INITIALIZER -
 108                            CLOSURE_RUNNING +
 109                            CLOSURE_DESTRUCTOR);
 110         } else {
 111                 atomic_set(&dio->cl.remaining,
 112                            CLOSURE_REMAINING_INITIALIZER + 1);
 113                 dio->cl.closure_get_happened = true;
 114         }
 115
 116         dio->req        = req;
 117         dio->ret        = ret;
 118         /*
 119          * This is one of the sketchier things I've encountered: we have to skip
 120          * the dirtying of requests that are internal from the kernel (i.e. from
 121          * loopback), because we'll deadlock on page_lock.
 122          */
 123         dio->should_dirty = iter_is_iovec(iter);
 124
 125         goto start;
 126         while (iter->count) {
 127                 bio = bio_alloc_bioset(NULL,
 128                                        bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
 129                                        REQ_OP_READ,
 130                                        GFP_KERNEL,
 131                                        &c->bio_read);
 132                 bio->bi_end_io          = bch2_direct_IO_read_split_endio;
 133 start:
 134                 bio->bi_opf             = REQ_OP_READ|REQ_SYNC;
 135                 bio->bi_iter.bi_sector  = offset >> 9;
 136                 bio->bi_private         = dio;
 137
 138                 ret = bio_iov_iter_get_pages(bio, iter);
 139                 if (ret < 0) {
 140                         /* XXX: fault inject this path */
 141                         bio->bi_status = BLK_STS_RESOURCE;
 142                         bio_endio(bio);
 143                         break;
 144                 }
 145
 146                 offset += bio->bi_iter.bi_size;
 147
 148                 if (dio->should_dirty)
 149                         bio_set_pages_dirty(bio);
 150
 151                 if (iter->count)
 152                         closure_get(&dio->cl);
 153
 154                 bch2_read(c, rbio_init(bio, opts), inode_inum(inode));
 155         }
 156
 157         iter->count += shorten;
 158
 159         if (sync) {
 160                 closure_sync(&dio->cl);
 161                 closure_debug_destroy(&dio->cl);
 162                 ret = dio->ret;
 163                 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
 164                 return ret;
 165         } else {
 166                 return -EIOCBQUEUED;
 167         }
 168 }
 169
 170 ssize_t bch2_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 171 {
 172         struct file *file = iocb->ki_filp;
 173         struct bch_inode_info *inode = file_bch_inode(file);
 174         struct address_space *mapping = file->f_mapping;
 175         size_t count = iov_iter_count(iter);
 176         ssize_t ret;
 177
 178         if (!count)
 179                 return 0; /* skip atime */
 180
 181         if (iocb->ki_flags & IOCB_DIRECT) {
 182                 struct blk_plug plug;
 183
 184                 if (unlikely(mapping->nrpages)) {
 185                         ret = filemap_write_and_wait_range(mapping,
 186                                                 iocb->ki_pos,
 187                                                 iocb->ki_pos + count - 1);
 188                         if (ret < 0)
 189                                 goto out;
 190                 }
 191
 192                 file_accessed(file);
 193
 194                 blk_start_plug(&plug);
 195                 ret = bch2_direct_IO_read(iocb, iter);
 196                 blk_finish_plug(&plug);
 197
 198                 if (ret >= 0)
 199                         iocb->ki_pos += ret;
 200         } else {
 201                 bch2_pagecache_add_get(inode);
 202                 ret = generic_file_read_iter(iocb, iter);
 203                 bch2_pagecache_add_put(inode);
 204         }
 205 out:
 206         return bch2_err_class(ret);
 207 }
 208
 209 /* O_DIRECT writes */
 210
 211 struct dio_write {
 212         struct kiocb                    *req;
 213         struct address_space            *mapping;
 214         struct bch_inode_info           *inode;
 215         struct mm_struct                *mm;
 216         const struct iovec              *iov;
 217         unsigned                        loop:1,
 218                                         extending:1,
 219                                         sync:1,
 220                                         flush:1;
 221         struct quota_res                quota_res;
 222         u64                             written;
 223
 224         struct iov_iter                 iter;
 225         struct iovec                    inline_vecs[2];
 226
 227         /* must be last: */
 228         struct bch_write_op             op;
 229 };
 230
 231 static bool bch2_check_range_allocated(struct bch_fs *c, subvol_inum inum,
 232                                        u64 offset, u64 size,
 233                                        unsigned nr_replicas, bool compressed)
 234 {
 235         struct btree_trans *trans = bch2_trans_get(c);
 236         struct btree_iter iter;
 237         struct bkey_s_c k;
 238         u64 end = offset + size;
 239         u32 snapshot;
 240         bool ret = true;
 241         int err;
 242 retry:
 243         bch2_trans_begin(trans);
 244
 245         err = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
 246         if (err)
 247                 goto err;
 248
 249         for_each_btree_key_norestart(trans, iter, BTREE_ID_extents,
 250                            SPOS(inum.inum, offset, snapshot),
 251                            BTREE_ITER_SLOTS, k, err) {
 252                 if (bkey_ge(bkey_start_pos(k.k), POS(inum.inum, end)))
 253                         break;
 254
 255                 if (k.k->p.snapshot != snapshot ||
 256                     nr_replicas > bch2_bkey_replicas(c, k) ||
 257                     (!compressed && bch2_bkey_sectors_compressed(k))) {
 258                         ret = false;
 259                         break;
 260                 }
 261         }
 262
 263         offset = iter.pos.offset;
 264         bch2_trans_iter_exit(trans, &iter);
 265 err:
 266         if (bch2_err_matches(err, BCH_ERR_transaction_restart))
 267                 goto retry;
 268         bch2_trans_put(trans);
 269
 270         return err ? false : ret;
 271 }
 272
 273 static noinline bool bch2_dio_write_check_allocated(struct dio_write *dio)
 274 {
 275         struct bch_fs *c = dio->op.c;
 276         struct bch_inode_info *inode = dio->inode;
 277         struct bio *bio = &dio->op.wbio.bio;
 278
 279         return bch2_check_range_allocated(c, inode_inum(inode),
 280                                 dio->op.pos.offset, bio_sectors(bio),
 281                                 dio->op.opts.data_replicas,
 282                                 dio->op.opts.compression != 0);
 283 }
 284
 285 static void bch2_dio_write_loop_async(struct bch_write_op *);
 286 static __always_inline long bch2_dio_write_done(struct dio_write *dio);
 287
 288 /*
 289  * We're going to return -EIOCBQUEUED, but we haven't finished consuming the
 290  * iov_iter yet, so we need to stash a copy of the iovec: it might be on the
 291  * caller's stack, we're not guaranteed that it will live for the duration of
 292  * the IO:
 293  */
 294 static noinline int bch2_dio_write_copy_iov(struct dio_write *dio)
 295 {
 296         struct iovec *iov = dio->inline_vecs;
 297
 298         /*
 299          * iov_iter has a single embedded iovec - nothing to do:
 300          */
 301         if (iter_is_ubuf(&dio->iter))
 302                 return 0;
 303
 304         /*
 305          * We don't currently handle non-iovec iov_iters here - return an error,
 306          * and we'll fall back to doing the IO synchronously:
 307          */
 308         if (!iter_is_iovec(&dio->iter))
 309                 return -1;
 310
 311         if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
 312                 dio->iov = iov = kmalloc_array(dio->iter.nr_segs, sizeof(*iov),
 313                                     GFP_KERNEL);
 314                 if (unlikely(!iov))
 315                         return -ENOMEM;
 316         }
 317
 318         memcpy(iov, dio->iter.__iov, dio->iter.nr_segs * sizeof(*iov));
 319         dio->iter.__iov = iov;
 320         return 0;
 321 }
 322
 323 static CLOSURE_CALLBACK(bch2_dio_write_flush_done)
 324 {
 325         closure_type(dio, struct dio_write, op.cl);
 326         struct bch_fs *c = dio->op.c;
 327
 328         closure_debug_destroy(cl);
 329
 330         dio->op.error = bch2_journal_error(&c->journal);
 331
 332         bch2_dio_write_done(dio);
 333 }
 334
 335 static noinline void bch2_dio_write_flush(struct dio_write *dio)
 336 {
 337         struct bch_fs *c = dio->op.c;
 338         struct bch_inode_unpacked inode;
 339         int ret;
 340
 341         dio->flush = 0;
 342
 343         closure_init(&dio->op.cl, NULL);
 344
 345         if (!dio->op.error) {
 346                 ret = bch2_inode_find_by_inum(c, inode_inum(dio->inode), &inode);
 347                 if (ret) {
 348                         dio->op.error = ret;
 349                 } else {
 350                         bch2_journal_flush_seq_async(&c->journal, inode.bi_journal_seq,
 351                                                      &dio->op.cl);
 352                         bch2_inode_flush_nocow_writes_async(c, dio->inode, &dio->op.cl);
 353                 }
 354         }
 355
 356         if (dio->sync) {
 357                 closure_sync(&dio->op.cl);
 358                 closure_debug_destroy(&dio->op.cl);
 359         } else {
 360                 continue_at(&dio->op.cl, bch2_dio_write_flush_done, NULL);
 361         }
 362 }
 363
 364 static __always_inline long bch2_dio_write_done(struct dio_write *dio)
 365 {
 366         struct kiocb *req = dio->req;
 367         struct bch_inode_info *inode = dio->inode;
 368         bool sync = dio->sync;
 369         long ret;
 370
 371         if (unlikely(dio->flush)) {
 372                 bch2_dio_write_flush(dio);
 373                 if (!sync)
 374                         return -EIOCBQUEUED;
 375         }
 376
 377         bch2_pagecache_block_put(inode);
 378
 379         kfree(dio->iov);
 380
 381         ret = dio->op.error ?: ((long) dio->written << 9);
 382         bio_put(&dio->op.wbio.bio);
 383
 384         /* inode->i_dio_count is our ref on inode and thus bch_fs */
 385         inode_dio_end(&inode->v);
 386
 387         if (ret < 0)
 388                 ret = bch2_err_class(ret);
 389
 390         if (!sync) {
 391                 req->ki_complete(req, ret);
 392                 ret = -EIOCBQUEUED;
 393         }
 394         return ret;
 395 }
 396
 397 static __always_inline void bch2_dio_write_end(struct dio_write *dio)
 398 {
 399         struct bch_fs *c = dio->op.c;
 400         struct kiocb *req = dio->req;
 401         struct bch_inode_info *inode = dio->inode;
 402         struct bio *bio = &dio->op.wbio.bio;
 403
 404         req->ki_pos     += (u64) dio->op.written << 9;
 405         dio->written    += dio->op.written;
 406
 407         if (dio->extending) {
 408                 spin_lock(&inode->v.i_lock);
 409                 if (req->ki_pos > inode->v.i_size)
 410                         i_size_write(&inode->v, req->ki_pos);
 411                 spin_unlock(&inode->v.i_lock);
 412         }
 413
 414         if (dio->op.i_sectors_delta || dio->quota_res.sectors) {
 415                 mutex_lock(&inode->ei_quota_lock);
 416                 __bch2_i_sectors_acct(c, inode, &dio->quota_res, dio->op.i_sectors_delta);
 417                 __bch2_quota_reservation_put(c, inode, &dio->quota_res);
 418                 mutex_unlock(&inode->ei_quota_lock);
 419         }
 420
 421         bio_release_pages(bio, false);
 422
 423         if (unlikely(dio->op.error))
 424                 set_bit(EI_INODE_ERROR, &inode->ei_flags);
 425 }
 426
 427 static __always_inline long bch2_dio_write_loop(struct dio_write *dio)
 428 {
 429         struct bch_fs *c = dio->op.c;
 430         struct kiocb *req = dio->req;
 431         struct address_space *mapping = dio->mapping;
 432         struct bch_inode_info *inode = dio->inode;
 433         struct bch_io_opts opts;
 434         struct bio *bio = &dio->op.wbio.bio;
 435         unsigned unaligned, iter_count;
 436         bool sync = dio->sync, dropped_locks;
 437         long ret;
 438
 439         bch2_inode_opts_get(&opts, c, &inode->ei_inode);
 440
 441         while (1) {
 442                 iter_count = dio->iter.count;
 443
 444                 EBUG_ON(current->faults_disabled_mapping);
 445                 current->faults_disabled_mapping = mapping;
 446
 447                 ret = bio_iov_iter_get_pages(bio, &dio->iter);
 448
 449                 dropped_locks = fdm_dropped_locks();
 450
 451                 current->faults_disabled_mapping = NULL;
 452
 453                 /*
 454                  * If the fault handler returned an error but also signalled
 455                  * that it dropped & retook ei_pagecache_lock, we just need to
 456                  * re-shoot down the page cache and retry:
 457                  */
 458                 if (dropped_locks && ret)
 459                         ret = 0;
 460
 461                 if (unlikely(ret < 0))
 462                         goto err;
 463
 464                 if (unlikely(dropped_locks)) {
 465                         ret = bch2_write_invalidate_inode_pages_range(mapping,
 466                                         req->ki_pos,
 467                                         req->ki_pos + iter_count - 1);
 468                         if (unlikely(ret))
 469                                 goto err;
 470
 471                         if (!bio->bi_iter.bi_size)
 472                                 continue;
 473                 }
 474
 475                 unaligned = bio->bi_iter.bi_size & (block_bytes(c) - 1);
 476                 bio->bi_iter.bi_size -= unaligned;
 477                 iov_iter_revert(&dio->iter, unaligned);
 478
 479                 if (!bio->bi_iter.bi_size) {
 480                         /*
 481                          * bio_iov_iter_get_pages was only able to get <
 482                          * blocksize worth of pages:
 483                          */
 484                         ret = -EFAULT;
 485                         goto err;
 486                 }
 487
 488                 bch2_write_op_init(&dio->op, c, opts);
 489                 dio->op.end_io          = sync
 490                         ? NULL
 491                         : bch2_dio_write_loop_async;
 492                 dio->op.target          = dio->op.opts.foreground_target;
 493                 dio->op.write_point     = writepoint_hashed((unsigned long) current);
 494                 dio->op.nr_replicas     = dio->op.opts.data_replicas;
 495                 dio->op.subvol          = inode->ei_subvol;
 496                 dio->op.pos             = POS(inode->v.i_ino, (u64) req->ki_pos >> 9);
 497                 dio->op.devs_need_flush = &inode->ei_devs_need_flush;
 498
 499                 if (sync)
 500                         dio->op.flags |= BCH_WRITE_SYNC;
 501                 dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
 502
 503                 ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
 504                                                  bio_sectors(bio), true);
 505                 if (unlikely(ret))
 506                         goto err;
 507
 508                 ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
 509                                                 dio->op.opts.data_replicas, 0);
 510                 if (unlikely(ret) &&
 511                     !bch2_dio_write_check_allocated(dio))
 512                         goto err;
 513
 514                 task_io_account_write(bio->bi_iter.bi_size);
 515
 516                 if (unlikely(dio->iter.count) &&
 517                     !dio->sync &&
 518                     !dio->loop &&
 519                     bch2_dio_write_copy_iov(dio))
 520                         dio->sync = sync = true;
 521
 522                 dio->loop = true;
 523                 closure_call(&dio->op.cl, bch2_write, NULL, NULL);
 524
 525                 if (!sync)
 526                         return -EIOCBQUEUED;
 527
 528                 bch2_dio_write_end(dio);
 529
 530                 if (likely(!dio->iter.count) || dio->op.error)
 531                         break;
 532
 533                 bio_reset(bio, NULL, REQ_OP_WRITE);
 534         }
 535 out:
 536         return bch2_dio_write_done(dio);
 537 err:
 538         dio->op.error = ret;
 539
 540         bio_release_pages(bio, false);
 541
 542         bch2_quota_reservation_put(c, inode, &dio->quota_res);
 543         goto out;
 544 }
 545
 546 static noinline __cold void bch2_dio_write_continue(struct dio_write *dio)
 547 {
 548         struct mm_struct *mm = dio->mm;
 549
 550         bio_reset(&dio->op.wbio.bio, NULL, REQ_OP_WRITE);
 551
 552         if (mm)
 553                 kthread_use_mm(mm);
 554         bch2_dio_write_loop(dio);
 555         if (mm)
 556                 kthread_unuse_mm(mm);
 557 }
 558
 559 static void bch2_dio_write_loop_async(struct bch_write_op *op)
 560 {
 561         struct dio_write *dio = container_of(op, struct dio_write, op);
 562
 563         bch2_dio_write_end(dio);
 564
 565         if (likely(!dio->iter.count) || dio->op.error)
 566                 bch2_dio_write_done(dio);
 567         else
 568                 bch2_dio_write_continue(dio);
 569 }
 570
 571 ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
 572 {
 573         struct file *file = req->ki_filp;
 574         struct address_space *mapping = file->f_mapping;
 575         struct bch_inode_info *inode = file_bch_inode(file);
 576         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 577         struct dio_write *dio;
 578         struct bio *bio;
 579         bool locked = true, extending;
 580         ssize_t ret;
 581
 582         prefetch(&c->opts);
 583         prefetch((void *) &c->opts + 64);
 584         prefetch(&inode->ei_inode);
 585         prefetch((void *) &inode->ei_inode + 64);
 586
 587         inode_lock(&inode->v);
 588
 589         ret = generic_write_checks(req, iter);
 590         if (unlikely(ret <= 0))
 591                 goto err;
 592
 593         ret = file_remove_privs(file);
 594         if (unlikely(ret))
 595                 goto err;
 596
 597         ret = file_update_time(file);
 598         if (unlikely(ret))
 599                 goto err;
 600
 601         if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
 602                 goto err;
 603
 604         inode_dio_begin(&inode->v);
 605         bch2_pagecache_block_get(inode);
 606
 607         extending = req->ki_pos + iter->count > inode->v.i_size;
 608         if (!extending) {
 609                 inode_unlock(&inode->v);
 610                 locked = false;
 611         }
 612
 613         bio = bio_alloc_bioset(NULL,
 614                                bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
 615                                REQ_OP_WRITE,
 616                                GFP_KERNEL,
 617                                &c->dio_write_bioset);
 618         dio = container_of(bio, struct dio_write, op.wbio.bio);
 619         dio->req                = req;
 620         dio->mapping            = mapping;
 621         dio->inode              = inode;
 622         dio->mm                 = current->mm;
 623         dio->iov                = NULL;
 624         dio->loop               = false;
 625         dio->extending          = extending;
 626         dio->sync               = is_sync_kiocb(req) || extending;
 627         dio->flush              = iocb_is_dsync(req) && !c->opts.journal_flush_disabled;
 628         dio->quota_res.sectors  = 0;
 629         dio->written            = 0;
 630         dio->iter               = *iter;
 631         dio->op.c               = c;
 632
 633         if (unlikely(mapping->nrpages)) {
 634                 ret = bch2_write_invalidate_inode_pages_range(mapping,
 635                                                 req->ki_pos,
 636                                                 req->ki_pos + iter->count - 1);
 637                 if (unlikely(ret))
 638                         goto err_put_bio;
 639         }
 640
 641         ret = bch2_dio_write_loop(dio);
 642 err:
 643         if (locked)
 644                 inode_unlock(&inode->v);
 645         return ret;
 646 err_put_bio:
 647         bch2_pagecache_block_put(inode);
 648         bio_put(bio);
 649         inode_dio_end(&inode->v);
 650         goto err;
 651 }
 652
 653 void bch2_fs_fs_io_direct_exit(struct bch_fs *c)
 654 {
 655         bioset_exit(&c->dio_write_bioset);
 656         bioset_exit(&c->dio_read_bioset);
 657 }
 658
 659 int bch2_fs_fs_io_direct_init(struct bch_fs *c)
 660 {
 661         if (bioset_init(&c->dio_read_bioset,
 662                         4, offsetof(struct dio_read, rbio.bio),
 663                         BIOSET_NEED_BVECS))
 664                 return -BCH_ERR_ENOMEM_dio_read_bioset_init;
 665
 666         if (bioset_init(&c->dio_write_bioset,
 667                         4, offsetof(struct dio_write, op.wbio.bio),
 668                         BIOSET_NEED_BVECS))
 669                 return -BCH_ERR_ENOMEM_dio_write_bioset_init;
 670
 671         return 0;
 672 }
 673
 674 #endif /* NO_BCACHEFS_FS */