lustre/osd-ldiskfs/osd_io.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) 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, 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/osd/osd_io.c
  37  *
  38  * body operations
  39  *
  40  * Author: Nikita Danilov <nikita@clusterfs.com>
  41  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  42  *
  43  */
  44
  45 /* LUSTRE_VERSION_CODE */
  46 #include <lustre_ver.h>
  47 /* prerequisite for linux/xattr.h */
  48 #include <linux/types.h>
  49 /* prerequisite for linux/xattr.h */
  50 #include <linux/fs.h>
  51
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  * OBD_FAIL_CHECK
  55  */
  56 #include <obd_support.h>
  57
  58 #include "osd_internal.h"
  59
  60 /* ext_depth() */
  61 #include <ldiskfs/ldiskfs_extents.h>
  62
  63 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
  64                             int rw, int line, int pages)
  65 {
  66         int blocks, i;
  67
  68         LASSERTF(iobuf->dr_elapsed_valid == 0,
  69                  "iobuf %p, reqs %d, rw %d, line %d\n", iobuf,
  70                  atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
  71                  iobuf->dr_init_at);
  72         LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
  73
  74         init_waitqueue_head(&iobuf->dr_wait);
  75         atomic_set(&iobuf->dr_numreqs, 0);
  76         iobuf->dr_npages = 0;
  77         iobuf->dr_error = 0;
  78         iobuf->dr_dev = d;
  79         iobuf->dr_frags = 0;
  80         iobuf->dr_elapsed = 0;
  81         /* must be counted before, so assert */
  82         iobuf->dr_rw = rw;
  83         iobuf->dr_init_at = line;
  84
  85         blocks = pages * (PAGE_CACHE_SIZE >> osd_sb(d)->s_blocksize_bits);
  86         if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
  87                 LASSERT(iobuf->dr_pg_buf.lb_len >=
  88                         pages * sizeof(iobuf->dr_pages[0]));
  89                 return 0;
  90         }
  91
  92         /* start with 1MB for 4K blocks */
  93         i = 256;
  94         while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
  95                 i <<= 1;
  96
  97         CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
  98                (unsigned)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
  99         pages = i;
 100         blocks = pages * (PAGE_CACHE_SIZE >> osd_sb(d)->s_blocksize_bits);
 101         iobuf->dr_max_pages = 0;
 102         CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
 103                (unsigned)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
 104
 105         lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
 106         iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
 107         if (unlikely(iobuf->dr_blocks == NULL))
 108                 return -ENOMEM;
 109
 110         lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0]));
 111         iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf;
 112         if (unlikely(iobuf->dr_pages == NULL))
 113                 return -ENOMEM;
 114
 115         iobuf->dr_max_pages = pages;
 116
 117         return 0;
 118 }
 119 #define osd_init_iobuf(dev, iobuf, rw, pages) \
 120         __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
 121
 122 static void osd_iobuf_add_page(struct osd_iobuf *iobuf, struct page *page)
 123 {
 124         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
 125         iobuf->dr_pages[iobuf->dr_npages++] = page;
 126 }
 127
 128 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
 129 {
 130         int rw = iobuf->dr_rw;
 131
 132         if (iobuf->dr_elapsed_valid) {
 133                 iobuf->dr_elapsed_valid = 0;
 134                 LASSERT(iobuf->dr_dev == d);
 135                 LASSERT(iobuf->dr_frags > 0);
 136                 lprocfs_oh_tally(&d->od_brw_stats.
 137                                  hist[BRW_R_DIO_FRAGS+rw],
 138                                  iobuf->dr_frags);
 139                 lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw],
 140                                       iobuf->dr_elapsed);
 141         }
 142 }
 143
 144 #ifndef REQ_WRITE /* pre-2.6.35 */
 145 #define __REQ_WRITE BIO_RW
 146 #endif
 147
 148 static void dio_complete_routine(struct bio *bio, int error)
 149 {
 150         struct osd_iobuf *iobuf = bio->bi_private;
 151 #ifdef HAVE_BVEC_ITER
 152         struct bvec_iter iter;
 153         struct bio_vec bvl;
 154 #else
 155         int iter;
 156         struct bio_vec *bvl;
 157 #endif
 158
 159         /* CAVEAT EMPTOR: possibly in IRQ context
 160          * DO NOT record procfs stats here!!! */
 161
 162         if (unlikely(iobuf == NULL)) {
 163                 CERROR("***** bio->bi_private is NULL!  This should never "
 164                        "happen.  Normally, I would crash here, but instead I "
 165                        "will dump the bio contents to the console.  Please "
 166                        "report this to <https://jira.hpdd.intel.com/> , along "
 167                        "with any interesting messages leading up to this point "
 168                        "(like SCSI errors, perhaps).  Because bi_private is "
 169                        "NULL, I can't wake up the thread that initiated this "
 170                        "IO - you will probably have to reboot this node.\n");
 171                 CERROR("bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d, "
 172                        "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
 173                        "bi_private: %p\n", bio->bi_next, bio->bi_flags,
 174                         bio->bi_rw, bio->bi_vcnt, bio_idx(bio),
 175                         bio_sectors(bio) << 9, bio->bi_end_io,
 176                         atomic_read(&bio->bi_cnt), bio->bi_private);
 177                 return;
 178         }
 179
 180         /* the check is outside of the cycle for performance reason -bzzz */
 181         if (!test_bit(__REQ_WRITE, &bio->bi_rw)) {
 182                 bio_for_each_segment(bvl, bio, iter) {
 183                         if (likely(error == 0))
 184                                 SetPageUptodate(bvec_iter_page(&bvl, iter));
 185                         LASSERT(PageLocked(bvec_iter_page(&bvl, iter)));
 186                 }
 187                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
 188         } else {
 189                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
 190         }
 191
 192         /* any real error is good enough -bzzz */
 193         if (error != 0 && iobuf->dr_error == 0)
 194                 iobuf->dr_error = error;
 195
 196         /*
 197          * set dr_elapsed before dr_numreqs turns to 0, otherwise
 198          * it's possible that service thread will see dr_numreqs
 199          * is zero, but dr_elapsed is not set yet, leading to lost
 200          * data in this processing and an assertion in a subsequent
 201          * call to OSD.
 202          */
 203         if (atomic_read(&iobuf->dr_numreqs) == 1) {
 204                 iobuf->dr_elapsed = jiffies - iobuf->dr_start_time;
 205                 iobuf->dr_elapsed_valid = 1;
 206         }
 207         if (atomic_dec_and_test(&iobuf->dr_numreqs))
 208                 wake_up(&iobuf->dr_wait);
 209
 210         /* Completed bios used to be chained off iobuf->dr_bios and freed in
 211          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
 212          * mempool when serious on-disk fragmentation was encountered,
 213          * deadlocking the OST.  The bios are now released as soon as complete
 214          * so the pool cannot be exhausted while IOs are competing. bug 10076 */
 215         bio_put(bio);
 216 }
 217
 218 static void record_start_io(struct osd_iobuf *iobuf, int size)
 219 {
 220         struct osd_device    *osd = iobuf->dr_dev;
 221         struct obd_histogram *h = osd->od_brw_stats.hist;
 222
 223         iobuf->dr_frags++;
 224         atomic_inc(&iobuf->dr_numreqs);
 225
 226         if (iobuf->dr_rw == 0) {
 227                 atomic_inc(&osd->od_r_in_flight);
 228                 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
 229                                  atomic_read(&osd->od_r_in_flight));
 230                 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
 231         } else if (iobuf->dr_rw == 1) {
 232                 atomic_inc(&osd->od_w_in_flight);
 233                 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
 234                                  atomic_read(&osd->od_w_in_flight));
 235                 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
 236         } else {
 237                 LBUG();
 238         }
 239 }
 240
 241 static void osd_submit_bio(int rw, struct bio *bio)
 242 {
 243         LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
 244         if (rw == 0)
 245                 submit_bio(READ, bio);
 246         else
 247                 submit_bio(WRITE, bio);
 248 }
 249
 250 static int can_be_merged(struct bio *bio, sector_t sector)
 251 {
 252         if (bio == NULL)
 253                 return 0;
 254
 255         return bio_end_sector(bio) == sector ? 1 : 0;
 256 }
 257
 258 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
 259                       struct osd_iobuf *iobuf)
 260 {
 261         int            blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
 262         struct page  **pages = iobuf->dr_pages;
 263         int            npages = iobuf->dr_npages;
 264         unsigned long *blocks = iobuf->dr_blocks;
 265         int            total_blocks = npages * blocks_per_page;
 266         int            sector_bits = inode->i_sb->s_blocksize_bits - 9;
 267         unsigned int   blocksize = inode->i_sb->s_blocksize;
 268         struct bio    *bio = NULL;
 269         struct page   *page;
 270         unsigned int   page_offset;
 271         sector_t       sector;
 272         int            nblocks;
 273         int            block_idx;
 274         int            page_idx;
 275         int            i;
 276         int            rc = 0;
 277         ENTRY;
 278
 279         LASSERT(iobuf->dr_npages == npages);
 280
 281         osd_brw_stats_update(osd, iobuf);
 282         iobuf->dr_start_time = cfs_time_current();
 283
 284         for (page_idx = 0, block_idx = 0;
 285              page_idx < npages;
 286              page_idx++, block_idx += blocks_per_page) {
 287
 288                 page = pages[page_idx];
 289                 LASSERT(block_idx + blocks_per_page <= total_blocks);
 290
 291                 for (i = 0, page_offset = 0;
 292                      i < blocks_per_page;
 293                      i += nblocks, page_offset += blocksize * nblocks) {
 294
 295                         nblocks = 1;
 296
 297                         if (blocks[block_idx + i] == 0) {  /* hole */
 298                                 LASSERTF(iobuf->dr_rw == 0,
 299                                          "page_idx %u, block_idx %u, i %u\n",
 300                                          page_idx, block_idx, i);
 301                                 memset(kmap(page) + page_offset, 0, blocksize);
 302                                 kunmap(page);
 303                                 continue;
 304                         }
 305
 306                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
 307
 308                         /* Additional contiguous file blocks? */
 309                         while (i + nblocks < blocks_per_page &&
 310                                (sector + (nblocks << sector_bits)) ==
 311                                ((sector_t)blocks[block_idx + i + nblocks] <<
 312                                 sector_bits))
 313                                 nblocks++;
 314
 315                         if (bio != NULL &&
 316                             can_be_merged(bio, sector) &&
 317                             bio_add_page(bio, page,
 318                                          blocksize * nblocks, page_offset) != 0)
 319                                 continue;       /* added this frag OK */
 320
 321                         if (bio != NULL) {
 322                                 struct request_queue *q =
 323                                         bdev_get_queue(bio->bi_bdev);
 324                                 unsigned int bi_size = bio_sectors(bio) << 9;
 325
 326                                 /* Dang! I have to fragment this I/O */
 327                                 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
 328                                        "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
 329                                        bi_size, bio->bi_vcnt, bio->bi_max_vecs,
 330                                        bio_sectors(bio),
 331                                        queue_max_sectors(q),
 332                                        bio_phys_segments(q, bio),
 333                                        queue_max_phys_segments(q),
 334                                        0, queue_max_hw_segments(q));
 335                                 record_start_io(iobuf, bi_size);
 336                                 osd_submit_bio(iobuf->dr_rw, bio);
 337                         }
 338
 339                         /* allocate new bio */
 340                         bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
 341                                                       (npages - page_idx) *
 342                                                       blocks_per_page));
 343                         if (bio == NULL) {
 344                                 CERROR("Can't allocate bio %u*%u = %u pages\n",
 345                                        (npages - page_idx), blocks_per_page,
 346                                        (npages - page_idx) * blocks_per_page);
 347                                 rc = -ENOMEM;
 348                                 goto out;
 349                         }
 350
 351                         bio->bi_bdev = inode->i_sb->s_bdev;
 352                         bio_set_sector(bio, sector);
 353                         bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
 354                         bio->bi_end_io = dio_complete_routine;
 355                         bio->bi_private = iobuf;
 356
 357                         rc = bio_add_page(bio, page,
 358                                           blocksize * nblocks, page_offset);
 359                         LASSERT(rc != 0);
 360                 }
 361         }
 362
 363         if (bio != NULL) {
 364                 record_start_io(iobuf, bio_sectors(bio) << 9);
 365                 osd_submit_bio(iobuf->dr_rw, bio);
 366                 rc = 0;
 367         }
 368
 369 out:
 370         /* in order to achieve better IO throughput, we don't wait for writes
 371          * completion here. instead we proceed with transaction commit in
 372          * parallel and wait for IO completion once transaction is stopped
 373          * see osd_trans_stop() for more details -bzzz */
 374         if (iobuf->dr_rw == 0) {
 375                 wait_event(iobuf->dr_wait,
 376                            atomic_read(&iobuf->dr_numreqs) == 0);
 377                 osd_fini_iobuf(osd, iobuf);
 378         }
 379
 380         if (rc == 0)
 381                 rc = iobuf->dr_error;
 382         RETURN(rc);
 383 }
 384
 385 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
 386                                    struct niobuf_local *lnb)
 387 {
 388         ENTRY;
 389
 390         *nrpages = 0;
 391
 392         while (len > 0) {
 393                 int poff = offset & (PAGE_CACHE_SIZE - 1);
 394                 int plen = PAGE_CACHE_SIZE - poff;
 395
 396                 if (plen > len)
 397                         plen = len;
 398                 lnb->lnb_file_offset = offset;
 399                 lnb->lnb_page_offset = poff;
 400                 lnb->lnb_len = plen;
 401                 /* lnb->lnb_flags = rnb->rnb_flags; */
 402                 lnb->lnb_flags = 0;
 403                 lnb->lnb_page = NULL;
 404                 lnb->lnb_rc = 0;
 405
 406                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
 407                          (long long) len);
 408                 offset += plen;
 409                 len -= plen;
 410                 lnb++;
 411                 (*nrpages)++;
 412         }
 413
 414         RETURN(0);
 415 }
 416
 417 struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
 418 {
 419         struct inode      *inode = osd_dt_obj(dt)->oo_inode;
 420         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
 421         struct page       *page;
 422
 423         LASSERT(inode);
 424
 425         page = find_or_create_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
 426                                    GFP_NOFS | __GFP_HIGHMEM);
 427         if (unlikely(page == NULL))
 428                 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
 429
 430         return page;
 431 }
 432
 433 /*
 434  * there are following "locks":
 435  * journal_start
 436  * i_mutex
 437  * page lock
 438
 439  * osd write path
 440     * lock page(s)
 441     * journal_start
 442     * truncate_sem
 443
 444  * ext4 vmtruncate:
 445     * lock pages, unlock
 446     * journal_start
 447     * lock partial page
 448     * i_data_sem
 449
 450 */
 451 int osd_bufs_get(const struct lu_env *env, struct dt_object *d, loff_t pos,
 452                  ssize_t len, struct niobuf_local *lnb, int rw,
 453                  struct lustre_capa *capa)
 454 {
 455         struct osd_object   *obj    = osd_dt_obj(d);
 456         int npages, i, rc = 0;
 457
 458         LASSERT(obj->oo_inode);
 459
 460         osd_map_remote_to_local(pos, len, &npages, lnb);
 461
 462         for (i = 0; i < npages; i++, lnb++) {
 463                 lnb->lnb_page = osd_get_page(d, lnb->lnb_file_offset, rw);
 464                 if (lnb->lnb_page == NULL)
 465                         GOTO(cleanup, rc = -ENOMEM);
 466
 467                 /* DLM locking protects us from write and truncate competing
 468                  * for same region, but truncate can leave dirty page in the
 469                  * cache. it's possible the writeout on a such a page is in
 470                  * progress when we access it. it's also possible that during
 471                  * this writeout we put new (partial) data, but then won't
 472                  * be able to proceed in filter_commitrw_write(). thus let's
 473                  * just wait for writeout completion, should be rare enough.
 474                  * -bzzz */
 475                 wait_on_page_writeback(lnb->lnb_page);
 476                 BUG_ON(PageWriteback(lnb->lnb_page));
 477
 478                 lu_object_get(&d->do_lu);
 479         }
 480         rc = i;
 481
 482 cleanup:
 483         RETURN(rc);
 484 }
 485
 486 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
 487                         struct niobuf_local *lnb, int npages)
 488 {
 489         int i;
 490
 491         for (i = 0; i < npages; i++) {
 492                 if (lnb[i].lnb_page == NULL)
 493                         continue;
 494                 LASSERT(PageLocked(lnb[i].lnb_page));
 495                 unlock_page(lnb[i].lnb_page);
 496                 page_cache_release(lnb[i].lnb_page);
 497                 lu_object_put(env, &dt->do_lu);
 498                 lnb[i].lnb_page = NULL;
 499         }
 500
 501         RETURN(0);
 502 }
 503
 504 #ifndef HAVE_LDISKFS_MAP_BLOCKS
 505
 506 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
 507 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
 508 #endif
 509
 510 struct bpointers {
 511         unsigned long *blocks;
 512         unsigned long start;
 513         int num;
 514         int init_num;
 515         int create;
 516 };
 517
 518 static long ldiskfs_ext_find_goal(struct inode *inode,
 519                                   struct ldiskfs_ext_path *path,
 520                                   unsigned long block, int *aflags)
 521 {
 522         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
 523         unsigned long bg_start;
 524         unsigned long colour;
 525         int depth;
 526
 527         if (path) {
 528                 struct ldiskfs_extent *ex;
 529                 depth = path->p_depth;
 530
 531                 /* try to predict block placement */
 532                 if ((ex = path[depth].p_ext))
 533                         return ldiskfs_ext_pblock(ex) +
 534                                 (block - le32_to_cpu(ex->ee_block));
 535
 536                 /* it looks index is empty
 537                  * try to find starting from index itself */
 538                 if (path[depth].p_bh)
 539                         return path[depth].p_bh->b_blocknr;
 540         }
 541
 542         /* OK. use inode's group */
 543         bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
 544                 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
 545         colour = (current->pid % 16) *
 546                 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 547         return bg_start + colour + block;
 548 }
 549
 550 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
 551                                 struct ldiskfs_ext_path *path,
 552                                 unsigned long block, unsigned long *count,
 553                                 int *err)
 554 {
 555         struct ldiskfs_allocation_request ar;
 556         unsigned long pblock;
 557         int aflags;
 558
 559         /* find neighbour allocated blocks */
 560         ar.lleft = block;
 561         *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
 562         if (*err)
 563                 return 0;
 564         ar.lright = block;
 565         *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
 566         if (*err)
 567                 return 0;
 568
 569         /* allocate new block */
 570         ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
 571         ar.inode = inode;
 572         ar.logical = block;
 573         ar.len = *count;
 574         ar.flags = LDISKFS_MB_HINT_DATA;
 575         pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
 576         *count = ar.len;
 577         return pblock;
 578 }
 579
 580 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
 581                                      struct ldiskfs_ext_path *path,
 582                                      struct ldiskfs_ext_cache *cex,
 583 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
 584                                      struct ldiskfs_extent *ex,
 585 #endif
 586                                      void *cbdata)
 587 {
 588         struct bpointers *bp = cbdata;
 589         struct ldiskfs_extent nex;
 590         unsigned long pblock;
 591         unsigned long tgen;
 592         int err, i;
 593         unsigned long count;
 594         handle_t *handle;
 595
 596 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
 597         if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
 598 #else
 599         if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
 600 #endif
 601                 err = EXT_CONTINUE;
 602                 goto map;
 603         }
 604
 605         if (bp->create == 0) {
 606                 i = 0;
 607                 if (cex->ec_block < bp->start)
 608                         i = bp->start - cex->ec_block;
 609                 if (i >= cex->ec_len)
 610                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 611                                         i, cex->ec_len);
 612                 for (; i < cex->ec_len && bp->num; i++) {
 613                         *(bp->blocks) = 0;
 614                         bp->blocks++;
 615                         bp->num--;
 616                         bp->start++;
 617                 }
 618
 619                 return EXT_CONTINUE;
 620         }
 621
 622         tgen = LDISKFS_I(inode)->i_ext_generation;
 623         count = ldiskfs_ext_calc_credits_for_insert(inode, path);
 624
 625         handle = osd_journal_start(inode, LDISKFS_HT_MISC,
 626                                    count + LDISKFS_ALLOC_NEEDED + 1);
 627         if (IS_ERR(handle)) {
 628                 return PTR_ERR(handle);
 629         }
 630
 631         if (tgen != LDISKFS_I(inode)->i_ext_generation) {
 632                 /* the tree has changed. so path can be invalid at moment */
 633                 ldiskfs_journal_stop(handle);
 634                 return EXT_REPEAT;
 635         }
 636
 637         /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
 638          * protected by i_data_sem as whole. so we patch it to store
 639          * generation to path and now verify the tree hasn't changed */
 640         down_write((&LDISKFS_I(inode)->i_data_sem));
 641
 642         /* validate extent, make sure the extent tree does not changed */
 643         if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
 644                 /* cex is invalid, try again */
 645                 up_write(&LDISKFS_I(inode)->i_data_sem);
 646                 ldiskfs_journal_stop(handle);
 647                 return EXT_REPEAT;
 648         }
 649
 650         count = cex->ec_len;
 651         pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
 652         if (!pblock)
 653                 goto out;
 654         BUG_ON(count > cex->ec_len);
 655
 656         /* insert new extent */
 657         nex.ee_block = cpu_to_le32(cex->ec_block);
 658         ldiskfs_ext_store_pblock(&nex, pblock);
 659         nex.ee_len = cpu_to_le16(count);
 660         err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
 661         if (err) {
 662                 /* free data blocks we just allocated */
 663                 /* not a good idea to call discard here directly,
 664                  * but otherwise we'd need to call it every free() */
 665                 ldiskfs_discard_preallocations(inode);
 666 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
 667                 ldiskfs_free_blocks(handle, inode, NULL,
 668                                     ldiskfs_ext_pblock(&nex),
 669                                     le16_to_cpu(nex.ee_len), 0);
 670 #else
 671                 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
 672                                     le16_to_cpu(nex.ee_len), 0);
 673 #endif
 674                 goto out;
 675         }
 676
 677         /*
 678          * Putting len of the actual extent we just inserted,
 679          * we are asking ldiskfs_ext_walk_space() to continue
 680          * scaning after that block
 681          */
 682         cex->ec_len = le16_to_cpu(nex.ee_len);
 683         cex->ec_start = ldiskfs_ext_pblock(&nex);
 684         BUG_ON(le16_to_cpu(nex.ee_len) == 0);
 685         BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
 686
 687 out:
 688         up_write((&LDISKFS_I(inode)->i_data_sem));
 689         ldiskfs_journal_stop(handle);
 690 map:
 691         if (err >= 0) {
 692                 /* map blocks */
 693                 if (bp->num == 0) {
 694                         CERROR("hmm. why do we find this extent?\n");
 695                         CERROR("initial space: %lu:%u\n",
 696                                 bp->start, bp->init_num);
 697 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
 698                         CERROR("current extent: %u/%u/%llu %d\n",
 699                                 cex->ec_block, cex->ec_len,
 700                                 (unsigned long long)cex->ec_start,
 701                                 cex->ec_type);
 702 #else
 703                         CERROR("current extent: %u/%u/%llu\n",
 704                                 cex->ec_block, cex->ec_len,
 705                                 (unsigned long long)cex->ec_start);
 706 #endif
 707                 }
 708                 i = 0;
 709                 if (cex->ec_block < bp->start)
 710                         i = bp->start - cex->ec_block;
 711                 if (i >= cex->ec_len)
 712                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 713                                         i, cex->ec_len);
 714                 for (; i < cex->ec_len && bp->num; i++) {
 715                         *(bp->blocks) = cex->ec_start + i;
 716 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
 717                         if (cex->ec_type != LDISKFS_EXT_CACHE_EXTENT) {
 718 #else
 719                         if ((cex->ec_len == 0) || (cex->ec_start == 0)) {
 720 #endif
 721                                 /* unmap any possible underlying metadata from
 722                                  * the block device mapping.  bug 6998. */
 723                                 unmap_underlying_metadata(inode->i_sb->s_bdev,
 724                                                           *(bp->blocks));
 725                         }
 726                         bp->blocks++;
 727                         bp->num--;
 728                         bp->start++;
 729                 }
 730         }
 731         return err;
 732 }
 733
 734 int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long block,
 735                             unsigned long num, unsigned long *blocks,
 736                             int create)
 737 {
 738         struct bpointers bp;
 739         int err;
 740
 741         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
 742                block, block + num - 1, (unsigned) inode->i_ino);
 743
 744         bp.blocks = blocks;
 745         bp.start = block;
 746         bp.init_num = bp.num = num;
 747         bp.create = create;
 748
 749         err = ldiskfs_ext_walk_space(inode, block, num,
 750                                          ldiskfs_ext_new_extent_cb, &bp);
 751         ldiskfs_ext_invalidate_cache(inode);
 752
 753         return err;
 754 }
 755
 756 int osd_ldiskfs_map_bm_inode_pages(struct inode *inode, struct page **page,
 757                                    int pages, unsigned long *blocks,
 758                                    int create)
 759 {
 760         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
 761         unsigned long *b;
 762         int rc = 0, i;
 763
 764         for (i = 0, b = blocks; i < pages; i++, page++) {
 765                 rc = ldiskfs_map_inode_page(inode, *page, b, create);
 766                 if (rc) {
 767                         CERROR("ino %lu, blk %lu create %d: rc %d\n",
 768                                inode->i_ino, *b, create, rc);
 769                         break;
 770                 }
 771                 b += blocks_per_page;
 772         }
 773         return rc;
 774 }
 775
 776 int osd_ldiskfs_map_ext_inode_pages(struct inode *inode, struct page **page,
 777                                     int pages, unsigned long *blocks,
 778                                     int create)
 779 {
 780         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
 781         int rc = 0, i = 0;
 782         struct page *fp = NULL;
 783         int clen = 0;
 784
 785         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 786                 inode->i_ino, pages, (*page)->index);
 787
 788         /* pages are sorted already. so, we just have to find
 789          * contig. space and process them properly */
 790         while (i < pages) {
 791                 if (fp == NULL) {
 792                         /* start new extent */
 793                         fp = *page++;
 794                         clen = 1;
 795                         i++;
 796                         continue;
 797                 } else if (fp->index + clen == (*page)->index) {
 798                         /* continue the extent */
 799                         page++;
 800                         clen++;
 801                         i++;
 802                         continue;
 803                 }
 804
 805                 /* process found extent */
 806                 rc = osd_ldiskfs_map_nblocks(inode, fp->index * blocks_per_page,
 807                                              clen * blocks_per_page, blocks,
 808                                              create);
 809                 if (rc)
 810                         GOTO(cleanup, rc);
 811
 812                 /* look for next extent */
 813                 fp = NULL;
 814                 blocks += blocks_per_page * clen;
 815         }
 816
 817         if (fp)
 818                 rc = osd_ldiskfs_map_nblocks(inode, fp->index * blocks_per_page,
 819                                              clen * blocks_per_page, blocks,
 820                                              create);
 821 cleanup:
 822         return rc;
 823 }
 824
 825 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
 826                                        int pages, unsigned long *blocks,
 827                                        int create)
 828 {
 829         int rc;
 830
 831         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
 832                 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
 833                                                      blocks, create);
 834                 return rc;
 835         }
 836         rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
 837
 838         return rc;
 839 }
 840 #else
 841 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
 842                                        int pages, unsigned long *blocks,
 843                                        int create)
 844 {
 845         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
 846         int rc = 0, i = 0;
 847         struct page *fp = NULL;
 848         int clen = 0;
 849
 850         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 851                 inode->i_ino, pages, (*page)->index);
 852
 853         /* pages are sorted already. so, we just have to find
 854          * contig. space and process them properly */
 855         while (i < pages) {
 856                 long blen, total = 0;
 857                 handle_t *handle = NULL;
 858                 struct ldiskfs_map_blocks map = { 0 };
 859
 860                 if (fp == NULL) { /* start new extent */
 861                         fp = *page++;
 862                         clen = 1;
 863                         if (++i != pages)
 864                                 continue;
 865                 } else if (fp->index + clen == (*page)->index) {
 866                         /* continue the extent */
 867                         page++;
 868                         clen++;
 869                         if (++i != pages)
 870                                 continue;
 871                 }
 872                 /* process found extent */
 873                 map.m_lblk = fp->index * blocks_per_page;
 874                 map.m_len = blen = clen * blocks_per_page;
 875                 if (create) {
 876                         create = LDISKFS_GET_BLOCKS_CREATE;
 877                         handle = ldiskfs_journal_current_handle();
 878                         LASSERT(handle != NULL);
 879                 }
 880 cont_map:
 881                 rc = ldiskfs_map_blocks(handle, inode, &map, create);
 882                 if (rc >= 0) {
 883                         int c = 0;
 884                         for (; total < blen && c < map.m_len; c++, total++) {
 885                                 if (rc == 0) {
 886                                         *(blocks + total) = 0;
 887                                         total++;
 888                                         break;
 889                                 } else {
 890                                         *(blocks + total) = map.m_pblk + c;
 891                                         /* unmap any possible underlying
 892                                          * metadata from the block device
 893                                          * mapping.  bug 6998. */
 894                                         if ((map.m_flags & LDISKFS_MAP_NEW) &&
 895                                             create)
 896                                                 unmap_underlying_metadata(
 897                                                         inode->i_sb->s_bdev,
 898                                                         map.m_pblk + c);
 899                                 }
 900                         }
 901                         rc = 0;
 902                 }
 903                 if (rc == 0 && total < blen) {
 904                         map.m_lblk = fp->index * blocks_per_page + total;
 905                         map.m_len = blen - total;
 906                         goto cont_map;
 907                 }
 908                 if (rc != 0)
 909                         GOTO(cleanup, rc);
 910
 911                 /* look for next extent */
 912                 fp = NULL;
 913                 blocks += blocks_per_page * clen;
 914         }
 915 cleanup:
 916         return rc;
 917 }
 918 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
 919
 920 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
 921                           struct niobuf_local *lnb, int npages)
 922 {
 923         struct osd_thread_info *oti   = osd_oti_get(env);
 924         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
 925         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
 926         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
 927         struct timeval          start;
 928         struct timeval          end;
 929         unsigned long           timediff;
 930         ssize_t                 isize;
 931         __s64                   maxidx;
 932         int                     rc = 0;
 933         int                     i;
 934         int                     cache = 0;
 935
 936         LASSERT(inode);
 937
 938         rc = osd_init_iobuf(osd, iobuf, 0, npages);
 939         if (unlikely(rc != 0))
 940                 RETURN(rc);
 941
 942         isize = i_size_read(inode);
 943         maxidx = ((isize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 1;
 944
 945         if (osd->od_writethrough_cache)
 946                 cache = 1;
 947         if (isize > osd->od_readcache_max_filesize)
 948                 cache = 0;
 949
 950         do_gettimeofday(&start);
 951         for (i = 0; i < npages; i++) {
 952
 953                 if (cache == 0)
 954                         generic_error_remove_page(inode->i_mapping,
 955                                                   lnb[i].lnb_page);
 956
 957                 /*
 958                  * till commit the content of the page is undefined
 959                  * we'll set it uptodate once bulk is done. otherwise
 960                  * subsequent reads can access non-stable data
 961                  */
 962                 ClearPageUptodate(lnb[i].lnb_page);
 963
 964                 if (lnb[i].lnb_len == PAGE_CACHE_SIZE)
 965                         continue;
 966
 967                 if (maxidx >= lnb[i].lnb_page->index) {
 968                         osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
 969                 } else {
 970                         long off;
 971                         char *p = kmap(lnb[i].lnb_page);
 972
 973                         off = lnb[i].lnb_page_offset;
 974                         if (off)
 975                                 memset(p, 0, off);
 976                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
 977                               ~CFS_PAGE_MASK;
 978                         if (off)
 979                                 memset(p + off, 0, PAGE_CACHE_SIZE - off);
 980                         kunmap(lnb[i].lnb_page);
 981                 }
 982         }
 983         do_gettimeofday(&end);
 984         timediff = cfs_timeval_sub(&end, &start, NULL);
 985         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
 986
 987         if (iobuf->dr_npages) {
 988                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
 989                                                  iobuf->dr_npages,
 990                                                  iobuf->dr_blocks, 0);
 991                 if (likely(rc == 0)) {
 992                         rc = osd_do_bio(osd, inode, iobuf);
 993                         /* do IO stats for preparation reads */
 994                         osd_fini_iobuf(osd, iobuf);
 995                 }
 996         }
 997         RETURN(rc);
 998 }
 999
1000 /* Check if a block is allocated or not */
1001 static int osd_is_mapped(struct inode *inode, obd_size offset)
1002 {
1003         sector_t (*fs_bmap)(struct address_space *, sector_t);
1004
1005         fs_bmap = inode->i_mapping->a_ops->bmap;
1006
1007         /* We can't know if we are overwriting or not */
1008         if (unlikely(fs_bmap == NULL))
1009                 return 0;
1010
1011         if (i_size_read(inode) == 0)
1012                 return 0;
1013
1014         /* Beyond EOF, must not be mapped */
1015         if (((i_size_read(inode) - 1) >> inode->i_blkbits) <
1016             (offset >> inode->i_blkbits))
1017                 return 0;
1018
1019         if (fs_bmap(inode->i_mapping, offset >> inode->i_blkbits) == 0)
1020                 return 0;
1021
1022         return 1;
1023 }
1024
1025 static int osd_declare_write_commit(const struct lu_env *env,
1026                                     struct dt_object *dt,
1027                                     struct niobuf_local *lnb, int npages,
1028                                     struct thandle *handle)
1029 {
1030         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1031         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1032         struct osd_thandle      *oh;
1033         int                      extents = 1;
1034         int                      depth;
1035         int                      i;
1036         int                      newblocks;
1037         int                      rc = 0;
1038         int                      flags = 0;
1039         bool                     ignore_quota = false;
1040         long long                quota_space = 0;
1041         ENTRY;
1042
1043         LASSERT(handle != NULL);
1044         oh = container_of0(handle, struct osd_thandle, ot_super);
1045         LASSERT(oh->ot_handle == NULL);
1046
1047         newblocks = npages;
1048
1049         /* calculate number of extents (probably better to pass nb) */
1050         for (i = 0; i < npages; i++) {
1051                 if (i && lnb[i].lnb_file_offset !=
1052                     lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1053                         extents++;
1054
1055                 if (!osd_is_mapped(inode, lnb[i].lnb_file_offset))
1056                         quota_space += PAGE_CACHE_SIZE;
1057
1058                 /* ignore quota for the whole request if any page is from
1059                  * client cache or written by root.
1060                  *
1061                  * XXX once we drop the 1.8 client support, the checking
1062                  * for whether page is from cache can be simplified as:
1063                  * !(lnb[i].flags & OBD_BRW_SYNC)
1064                  *
1065                  * XXX we could handle this on per-lnb basis as done by
1066                  * grant. */
1067                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1068                     (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1069                     OBD_BRW_FROM_GRANT)
1070                         ignore_quota = true;
1071         }
1072
1073         /*
1074          * each extent can go into new leaf causing a split
1075          * 5 is max tree depth: inode + 4 index blocks
1076          * with blockmaps, depth is 3 at most
1077          */
1078         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1079                 /*
1080                  * many concurrent threads may grow tree by the time
1081                  * our transaction starts. so, consider 2 is a min depth
1082                  */
1083                 depth = ext_depth(inode);
1084                 depth = max(depth, 1) + 1;
1085                 newblocks += depth;
1086                 oh->ot_credits++; /* inode */
1087                 oh->ot_credits += depth * 2 * extents;
1088         } else {
1089                 depth = 3;
1090                 newblocks += depth;
1091                 oh->ot_credits++; /* inode */
1092                 oh->ot_credits += depth * extents;
1093         }
1094
1095         /* quota space for metadata blocks */
1096         quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1097
1098         /* quota space should be reported in 1K blocks */
1099         quota_space = toqb(quota_space);
1100
1101         /* each new block can go in different group (bitmap + gd) */
1102
1103         /* we can't dirty more bitmap blocks than exist */
1104         if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1105                 oh->ot_credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1106         else
1107                 oh->ot_credits += newblocks;
1108
1109         /* we can't dirty more gd blocks than exist */
1110         if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1111                 oh->ot_credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1112         else
1113                 oh->ot_credits += newblocks;
1114
1115         /* make sure the over quota flags were not set */
1116         lnb[0].lnb_flags &= ~(OBD_BRW_OVER_USRQUOTA | OBD_BRW_OVER_GRPQUOTA);
1117
1118         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1119                                    quota_space, oh, osd_dt_obj(dt), true,
1120                                    &flags, ignore_quota);
1121
1122         /* we need only to store the overquota flags in the first lnb for
1123          * now, once we support multiple objects BRW, this code needs be
1124          * revised. */
1125         if (flags & QUOTA_FL_OVER_USRQUOTA)
1126                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1127         if (flags & QUOTA_FL_OVER_GRPQUOTA)
1128                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1129
1130         RETURN(rc);
1131 }
1132
1133 /* Check if a block is allocated or not */
1134 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1135                             struct niobuf_local *lnb, int npages,
1136                             struct thandle *thandle)
1137 {
1138         struct osd_thread_info *oti = osd_oti_get(env);
1139         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1140         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1141         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1142         loff_t isize;
1143         int rc = 0, i;
1144
1145         LASSERT(inode);
1146
1147         rc = osd_init_iobuf(osd, iobuf, 1, npages);
1148         if (unlikely(rc != 0))
1149                 RETURN(rc);
1150
1151         isize = i_size_read(inode);
1152         ll_vfs_dq_init(inode);
1153
1154         for (i = 0; i < npages; i++) {
1155                 if (lnb[i].lnb_rc == -ENOSPC &&
1156                     osd_is_mapped(inode, lnb[i].lnb_file_offset)) {
1157                         /* Allow the write to proceed if overwriting an
1158                          * existing block */
1159                         lnb[i].lnb_rc = 0;
1160                 }
1161
1162                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1163                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1164                                lnb[i].lnb_rc);
1165                         LASSERT(lnb[i].lnb_page);
1166                         generic_error_remove_page(inode->i_mapping,
1167                                                   lnb[i].lnb_page);
1168                         continue;
1169                 }
1170
1171                 LASSERT(PageLocked(lnb[i].lnb_page));
1172                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1173
1174                 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1175                         isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1176
1177                 /*
1178                  * Since write and truncate are serialized by oo_sem, even
1179                  * partial-page truncate should not leave dirty pages in the
1180                  * page cache.
1181                  */
1182                 LASSERT(!PageDirty(lnb[i].lnb_page));
1183
1184                 SetPageUptodate(lnb[i].lnb_page);
1185
1186                 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1187         }
1188
1189         if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1190                 rc = -ENOSPC;
1191         } else if (iobuf->dr_npages > 0) {
1192                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1193                                                  iobuf->dr_npages,
1194                                                  iobuf->dr_blocks, 1);
1195         } else {
1196                 /* no pages to write, no transno is needed */
1197                 thandle->th_local = 1;
1198         }
1199
1200         if (likely(rc == 0)) {
1201                 if (isize > i_size_read(inode)) {
1202                         i_size_write(inode, isize);
1203                         LDISKFS_I(inode)->i_disksize = isize;
1204                         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1205                 }
1206
1207                 rc = osd_do_bio(osd, inode, iobuf);
1208                 /* we don't do stats here as in read path because
1209                  * write is async: we'll do this in osd_put_bufs() */
1210         } else {
1211                 osd_fini_iobuf(osd, iobuf);
1212         }
1213
1214         if (unlikely(rc != 0)) {
1215                 /* if write fails, we should drop pages from the cache */
1216                 for (i = 0; i < npages; i++) {
1217                         if (lnb[i].lnb_page == NULL)
1218                                 continue;
1219                         LASSERT(PageLocked(lnb[i].lnb_page));
1220                         generic_error_remove_page(inode->i_mapping,
1221                                                   lnb[i].lnb_page);
1222                 }
1223         }
1224
1225         RETURN(rc);
1226 }
1227
1228 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1229                          struct niobuf_local *lnb, int npages)
1230 {
1231         struct osd_thread_info *oti = osd_oti_get(env);
1232         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1233         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1234         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1235         struct timeval start, end;
1236         unsigned long timediff;
1237         int rc = 0, i, m = 0, cache = 0, cache_hits = 0, cache_misses = 0;
1238
1239         LASSERT(inode);
1240
1241         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1242         if (unlikely(rc != 0))
1243                 RETURN(rc);
1244
1245         if (osd->od_read_cache)
1246                 cache = 1;
1247         if (i_size_read(inode) > osd->od_readcache_max_filesize)
1248                 cache = 0;
1249
1250         do_gettimeofday(&start);
1251         for (i = 0; i < npages; i++) {
1252
1253                 if (i_size_read(inode) <= lnb[i].lnb_file_offset)
1254                         /* If there's no more data, abort early.
1255                          * lnb->lnb_rc == 0, so it's easy to detect later. */
1256                         break;
1257
1258                 if (i_size_read(inode) <
1259                     lnb[i].lnb_file_offset + lnb[i].lnb_len - 1)
1260                         lnb[i].lnb_rc = i_size_read(inode) -
1261                                 lnb[i].lnb_file_offset;
1262                 else
1263                         lnb[i].lnb_rc = lnb[i].lnb_len;
1264                 m += lnb[i].lnb_len;
1265
1266                 if (PageUptodate(lnb[i].lnb_page)) {
1267                         cache_hits++;
1268                 } else {
1269                         cache_misses++;
1270                         osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1271                 }
1272
1273                 if (cache == 0)
1274                         generic_error_remove_page(inode->i_mapping,
1275                                                   lnb[i].lnb_page);
1276         }
1277         do_gettimeofday(&end);
1278         timediff = cfs_timeval_sub(&end, &start, NULL);
1279         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1280
1281         if (cache_hits != 0)
1282                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1283                                     cache_hits);
1284         if (cache_misses != 0)
1285                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1286                                     cache_misses);
1287         if (cache_hits + cache_misses != 0)
1288                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1289                                     cache_hits + cache_misses);
1290
1291         if (iobuf->dr_npages) {
1292                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1293                                                  iobuf->dr_npages,
1294                                                  iobuf->dr_blocks, 0);
1295                 rc = osd_do_bio(osd, inode, iobuf);
1296
1297                 /* IO stats will be done in osd_bufs_put() */
1298         }
1299
1300         RETURN(rc);
1301 }
1302
1303 /*
1304  * XXX: Another layering violation for now.
1305  *
1306  * We don't want to use ->f_op->read methods, because generic file write
1307  *
1308  *         - serializes on ->i_sem, and
1309  *
1310  *         - does a lot of extra work like balance_dirty_pages(),
1311  *
1312  * which doesn't work for globally shared files like /last_rcvd.
1313  */
1314 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1315 {
1316         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1317
1318         memcpy(buffer, (char *)ei->i_data, buflen);
1319
1320         return  buflen;
1321 }
1322
1323 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1324 {
1325         struct buffer_head *bh;
1326         unsigned long block;
1327         int osize;
1328         int blocksize;
1329         int csize;
1330         int boffs;
1331         int err;
1332
1333         /* prevent reading after eof */
1334         spin_lock(&inode->i_lock);
1335         if (i_size_read(inode) < *offs + size) {
1336                 loff_t diff = i_size_read(inode) - *offs;
1337                 spin_unlock(&inode->i_lock);
1338                 if (diff < 0) {
1339                         CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1340                                i_size_read(inode), *offs);
1341                         return -EBADR;
1342                 } else if (diff == 0) {
1343                         return 0;
1344                 } else {
1345                         size = diff;
1346                 }
1347         } else {
1348                 spin_unlock(&inode->i_lock);
1349         }
1350
1351         blocksize = 1 << inode->i_blkbits;
1352         osize = size;
1353         while (size > 0) {
1354                 block = *offs >> inode->i_blkbits;
1355                 boffs = *offs & (blocksize - 1);
1356                 csize = min(blocksize - boffs, size);
1357                 bh = ldiskfs_bread(NULL, inode, block, 0, &err);
1358                 if (err != 0) {
1359                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %d\n",
1360                                LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
1361                                csize, *offs, inode->i_ino, err);
1362                         if (bh != NULL)
1363                                 brelse(bh);
1364                         return err;
1365                 }
1366
1367                 if (bh != NULL) {
1368                         memcpy(buf, bh->b_data + boffs, csize);
1369                         brelse(bh);
1370                 } else {
1371                         memset(buf, 0, csize);
1372                 }
1373
1374                 *offs += csize;
1375                 buf += csize;
1376                 size -= csize;
1377         }
1378         return osize;
1379 }
1380
1381 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1382                         struct lu_buf *buf, loff_t *pos,
1383                         struct lustre_capa *capa)
1384 {
1385         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1386         int           rc;
1387
1388         if (osd_object_auth(env, dt, capa, CAPA_OPC_BODY_READ))
1389                 RETURN(-EACCES);
1390
1391         /* Read small symlink from inode body as we need to maintain correct
1392          * on-disk symlinks for ldiskfs.
1393          */
1394         if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1395             (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1396                 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1397         else
1398                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1399
1400         return rc;
1401 }
1402
1403 static inline int osd_extents_enabled(struct super_block *sb,
1404                                       struct inode *inode)
1405 {
1406         if (inode != NULL) {
1407                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1408                         return 1;
1409         } else if (test_opt(sb, EXTENTS)) {
1410                 return 1;
1411         }
1412         return 0;
1413 }
1414
1415 static inline int osd_calc_bkmap_credits(struct super_block *sb,
1416                                          struct inode *inode,
1417                                          const loff_t size,
1418                                          const loff_t pos,
1419                                          const int blocks)
1420 {
1421         int credits, bits, bs, i;
1422
1423         bits = sb->s_blocksize_bits;
1424         bs = 1 << bits;
1425
1426         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1427          * we do not expect blockmaps on the large files,
1428          * so let's shrink it to 2 levels (4GB files) */
1429
1430         /* this is default reservation: 2 levels */
1431         credits = (blocks + 2) * 3;
1432
1433         /* actual offset is unknown, hard to optimize */
1434         if (pos == -1)
1435                 return credits;
1436
1437         /* now check for few specific cases to optimize */
1438         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1439                 /* no indirects */
1440                 credits = blocks;
1441                 /* allocate if not allocated */
1442                 if (inode == NULL) {
1443                         credits += blocks * 2;
1444                         return credits;
1445                 }
1446                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1447                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1448                         if (LDISKFS_I(inode)->i_data[i] == 0)
1449                                 credits += 2;
1450                 }
1451         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1452                 /* single indirect */
1453                 credits = blocks * 3;
1454                 /* probably indirect block has been allocated already */
1455                 if (!inode || LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK])
1456                         credits += 3;
1457         }
1458
1459         return credits;
1460 }
1461
1462 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1463                                  const struct lu_buf *buf, loff_t _pos,
1464                                  struct thandle *handle)
1465 {
1466         struct osd_object  *obj  = osd_dt_obj(dt);
1467         struct inode       *inode = obj->oo_inode;
1468         struct super_block *sb = osd_sb(osd_obj2dev(obj));
1469         struct osd_thandle *oh;
1470         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
1471         int                 bits, bs;
1472         int                 depth, size;
1473         loff_t              pos;
1474         ENTRY;
1475
1476         LASSERT(buf != NULL);
1477         LASSERT(handle != NULL);
1478
1479         oh = container_of0(handle, struct osd_thandle, ot_super);
1480         LASSERT(oh->ot_handle == NULL);
1481
1482         size = buf->lb_len;
1483         bits = sb->s_blocksize_bits;
1484         bs = 1 << bits;
1485
1486         if (_pos == -1) {
1487                 /* if this is an append, then we
1488                  * should expect cross-block record */
1489                 pos = 0;
1490         } else {
1491                 pos = _pos;
1492         }
1493
1494         /* blocks to modify */
1495         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1496         LASSERT(blocks > 0);
1497
1498         if (inode != NULL && _pos != -1) {
1499                 /* object size in blocks */
1500                 est = (i_size_read(inode) + bs - 1) >> bits;
1501                 allocated = inode->i_blocks >> (bits - 9);
1502                 if (pos + size <= i_size_read(inode) && est <= allocated) {
1503                         /* looks like an overwrite, no need to modify tree */
1504                         credits = blocks;
1505                         /* no need to modify i_size */
1506                         goto out;
1507                 }
1508         }
1509
1510         if (osd_extents_enabled(sb, inode)) {
1511                 /*
1512                  * many concurrent threads may grow tree by the time
1513                  * our transaction starts. so, consider 2 is a min depth
1514                  * for every level we may need to allocate a new block
1515                  * and take some entries from the old one. so, 3 blocks
1516                  * to allocate (bitmap, gd, itself) + old block - 4 per
1517                  * level.
1518                  */
1519                 depth = inode != NULL ? ext_depth(inode) : 0;
1520                 depth = max(depth, 1) + 1;
1521                 credits = depth;
1522                 /* if not append, then split may need to modify
1523                  * existing blocks moving entries into the new ones */
1524                 if (_pos == -1)
1525                         credits += depth;
1526                 /* blocks to store data: bitmap,gd,itself */
1527                 credits += blocks * 3;
1528         } else {
1529                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1530         }
1531         /* if inode is created as part of the transaction,
1532          * then it's counted already by the creation method */
1533         if (inode != NULL)
1534                 credits++;
1535
1536 out:
1537
1538         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1539
1540         /* dt_declare_write() is usually called for system objects, such
1541          * as llog or last_rcvd files. We needn't enforce quota on those
1542          * objects, so always set the lqi_space as 0. */
1543         if (inode != NULL)
1544                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1545                                            i_gid_read(inode), 0, oh, obj, true,
1546                                            NULL, false);
1547         RETURN(rc);
1548 }
1549
1550 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1551 {
1552         /* LU-2634: clear the extent format for fast symlink */
1553         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1554
1555         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1556         LDISKFS_I(inode)->i_disksize = buflen;
1557         i_size_write(inode, buflen);
1558         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1559
1560         return 0;
1561 }
1562
1563 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1564                              int write_NUL, loff_t *offs, handle_t *handle)
1565 {
1566         struct buffer_head *bh        = NULL;
1567         loff_t              offset    = *offs;
1568         loff_t              new_size  = i_size_read(inode);
1569         unsigned long       block;
1570         int                 blocksize = 1 << inode->i_blkbits;
1571         int                 err = 0;
1572         int                 size;
1573         int                 boffs;
1574         int                 dirty_inode = 0;
1575
1576         if (write_NUL) {
1577                 /*
1578                  * long symlink write does not count the NUL terminator in
1579                  * bufsize, we write it, and the inode's file size does not
1580                  * count the NUL terminator as well.
1581                  */
1582                 ((char *)buf)[bufsize] = '\0';
1583                 ++bufsize;
1584         }
1585         while (bufsize > 0) {
1586                 if (bh != NULL)
1587                         brelse(bh);
1588
1589                 block = offset >> inode->i_blkbits;
1590                 boffs = offset & (blocksize - 1);
1591                 size = min(blocksize - boffs, bufsize);
1592                 bh = ldiskfs_bread(handle, inode, block, 1, &err);
1593                 if (!bh) {
1594                         CERROR("%s: error reading offset %llu (block %lu): "
1595                                "rc = %d\n",
1596                                inode->i_sb->s_id, offset, block, err);
1597                         break;
1598                 }
1599
1600                 err = ldiskfs_journal_get_write_access(handle, bh);
1601                 if (err) {
1602                         CERROR("journal_get_write_access() returned error %d\n",
1603                                err);
1604                         break;
1605                 }
1606                 LASSERTF(boffs + size <= bh->b_size,
1607                          "boffs %d size %d bh->b_size %lu\n",
1608                          boffs, size, (unsigned long)bh->b_size);
1609                 memcpy(bh->b_data + boffs, buf, size);
1610                 err = ldiskfs_journal_dirty_metadata(handle, bh);
1611                 if (err)
1612                         break;
1613
1614                 if (offset + size > new_size)
1615                         new_size = offset + size;
1616                 offset += size;
1617                 bufsize -= size;
1618                 buf += size;
1619         }
1620         if (bh)
1621                 brelse(bh);
1622
1623         if (write_NUL)
1624                 --new_size;
1625         /* correct in-core and on-disk sizes */
1626         if (new_size > i_size_read(inode)) {
1627                 spin_lock(&inode->i_lock);
1628                 if (new_size > i_size_read(inode))
1629                         i_size_write(inode, new_size);
1630                 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1631                         LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1632                         dirty_inode = 1;
1633                 }
1634                 spin_unlock(&inode->i_lock);
1635                 if (dirty_inode)
1636                         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1637         }
1638
1639         if (err == 0)
1640                 *offs = offset;
1641         return err;
1642 }
1643
1644 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1645                          const struct lu_buf *buf, loff_t *pos,
1646                          struct thandle *handle, struct lustre_capa *capa,
1647                          int ignore_quota)
1648 {
1649         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1650         struct osd_thandle      *oh;
1651         ssize_t                 result;
1652         int                     is_link;
1653
1654         LASSERT(dt_object_exists(dt));
1655
1656         if (osd_object_auth(env, dt, capa, CAPA_OPC_BODY_WRITE))
1657                 return -EACCES;
1658
1659         LASSERT(handle != NULL);
1660         LASSERT(inode != NULL);
1661         ll_vfs_dq_init(inode);
1662
1663         /* XXX: don't check: one declared chunk can be used many times */
1664         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1665
1666         oh = container_of(handle, struct osd_thandle, ot_super);
1667         LASSERT(oh->ot_handle->h_transaction != NULL);
1668         /* Write small symlink to inode body as we need to maintain correct
1669          * on-disk symlinks for ldiskfs.
1670          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1671          * does not count it in.
1672          */
1673         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1674         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1675                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1676         else
1677                 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1678                                                   buf->lb_len, is_link, pos,
1679                                                   oh->ot_handle);
1680         if (result == 0)
1681                 result = buf->lb_len;
1682         return result;
1683 }
1684
1685 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1686                              __u64 start, __u64 end, struct thandle *th)
1687 {
1688         struct osd_thandle *oh;
1689         struct inode       *inode;
1690         int                 rc;
1691         ENTRY;
1692
1693         LASSERT(th);
1694         oh = container_of(th, struct osd_thandle, ot_super);
1695
1696         /*
1697          * we don't need to reserve credits for whole truncate
1698          * it's not possible as truncate may need to free too many
1699          * blocks and that won't fit a single transaction. instead
1700          * we reserve credits to change i_size and put inode onto
1701          * orphan list. if needed truncate will extend or restart
1702          * transaction
1703          */
1704         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1705                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1706
1707         inode = osd_dt_obj(dt)->oo_inode;
1708         LASSERT(inode);
1709
1710         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1711                                    0, oh, osd_dt_obj(dt), true, NULL, false);
1712         RETURN(rc);
1713 }
1714
1715 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1716                      __u64 start, __u64 end, struct thandle *th,
1717                      struct lustre_capa *capa)
1718 {
1719         struct osd_thandle *oh;
1720         struct osd_object  *obj = osd_dt_obj(dt);
1721         struct inode       *inode = obj->oo_inode;
1722         handle_t           *h;
1723         tid_t               tid;
1724         int                rc = 0, rc2 = 0;
1725         ENTRY;
1726
1727         LASSERT(end == OBD_OBJECT_EOF);
1728         LASSERT(dt_object_exists(dt));
1729         LASSERT(osd_invariant(obj));
1730         LASSERT(inode != NULL);
1731         ll_vfs_dq_init(inode);
1732
1733         LASSERT(th);
1734         oh = container_of(th, struct osd_thandle, ot_super);
1735         LASSERT(oh->ot_handle->h_transaction != NULL);
1736
1737         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1738
1739         tid = oh->ot_handle->h_transaction->t_tid;
1740
1741         i_size_write(inode, start);
1742         ll_truncate_pagecache(inode, start);
1743 #ifdef HAVE_INODEOPS_TRUNCATE
1744         if (inode->i_op->truncate) {
1745                 inode->i_op->truncate(inode);
1746         } else
1747 #endif
1748                 ldiskfs_truncate(inode);
1749
1750         /*
1751          * For a partial-page truncate, flush the page to disk immediately to
1752          * avoid data corruption during direct disk write.  b=17397
1753          */
1754         if ((start & ~CFS_PAGE_MASK) != 0)
1755                 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1756
1757         h = journal_current_handle();
1758         LASSERT(h != NULL);
1759         LASSERT(h == oh->ot_handle);
1760
1761         if (tid != h->h_transaction->t_tid) {
1762                 int credits = oh->ot_credits;
1763                 /*
1764                  * transaction has changed during truncate
1765                  * we need to restart the handle with our credits
1766                  */
1767                 if (h->h_buffer_credits < credits) {
1768                         if (ldiskfs_journal_extend(h, credits))
1769                                 rc2 = ldiskfs_journal_restart(h, credits);
1770                 }
1771         }
1772
1773         RETURN(rc == 0 ? rc2 : rc);
1774 }
1775
1776 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1777                           struct ll_user_fiemap *fm)
1778 {
1779         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1780         struct osd_thread_info *info   = osd_oti_get(env);
1781         struct dentry          *dentry = &info->oti_obj_dentry;
1782         struct file            *file   = &info->oti_file;
1783         mm_segment_t            saved_fs;
1784         int rc;
1785
1786         LASSERT(inode);
1787         dentry->d_inode = inode;
1788         dentry->d_sb = inode->i_sb;
1789         file->f_dentry = dentry;
1790         file->f_mapping = inode->i_mapping;
1791         file->f_op = inode->i_fop;
1792         set_file_inode(file, inode);
1793
1794         saved_fs = get_fs();
1795         set_fs(get_ds());
1796         /* ldiskfs_ioctl does not have a inode argument */
1797         if (inode->i_fop->unlocked_ioctl)
1798                 rc = inode->i_fop->unlocked_ioctl(file, FSFILT_IOC_FIEMAP,
1799                                                   (long)fm);
1800         else
1801                 rc = -ENOTTY;
1802         set_fs(saved_fs);
1803         return rc;
1804 }
1805
1806 /*
1807  * in some cases we may need declare methods for objects being created
1808  * e.g., when we create symlink
1809  */
1810 const struct dt_body_operations osd_body_ops_new = {
1811         .dbo_declare_write = osd_declare_write,
1812 };
1813
1814 const struct dt_body_operations osd_body_ops = {
1815         .dbo_read                 = osd_read,
1816         .dbo_declare_write        = osd_declare_write,
1817         .dbo_write                = osd_write,
1818         .dbo_bufs_get             = osd_bufs_get,
1819         .dbo_bufs_put             = osd_bufs_put,
1820         .dbo_write_prep           = osd_write_prep,
1821         .dbo_declare_write_commit = osd_declare_write_commit,
1822         .dbo_write_commit         = osd_write_commit,
1823         .dbo_read_prep            = osd_read_prep,
1824         .dbo_declare_punch         = osd_declare_punch,
1825         .dbo_punch                 = osd_punch,
1826         .dbo_fiemap_get           = osd_fiemap_get,
1827 };
1828