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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/osd/osd_io.c
  33  *
  34  * body operations
  35  *
  36  * Author: Nikita Danilov <nikita@clusterfs.com>
  37  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  38  *
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_OSD
  42
  43 /* prerequisite for linux/xattr.h */
  44 #include <linux/types.h>
  45 /* prerequisite for linux/xattr.h */
  46 #include <linux/fs.h>
  47 #include <linux/mm.h>
  48 #include <linux/pagevec.h>
  49
  50 /*
  51  * struct OBD_{ALLOC,FREE}*()
  52  * OBD_FAIL_CHECK
  53  */
  54 #include <obd_support.h>
  55
  56 #include "osd_internal.h"
  57
  58 /* ext_depth() */
  59 #include <ldiskfs/ldiskfs_extents.h>
  60 #include <ldiskfs/ldiskfs.h>
  61
  62 static inline bool osd_use_page_cache(struct osd_device *d)
  63 {
  64         /* do not use pagecache if write and read caching are disabled */
  65         if (d->od_writethrough_cache + d->od_read_cache == 0)
  66                 return false;
  67         /* use pagecache by default */
  68         return true;
  69 }
  70
  71 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
  72                             int rw, int line, int pages)
  73 {
  74         int blocks, i;
  75
  76         LASSERTF(iobuf->dr_elapsed_valid == 0,
  77                  "iobuf %p, reqs %d, rw %d, line %d\n", iobuf,
  78                  atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
  79                  iobuf->dr_init_at);
  80         LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
  81
  82         init_waitqueue_head(&iobuf->dr_wait);
  83         atomic_set(&iobuf->dr_numreqs, 0);
  84         iobuf->dr_npages = 0;
  85         iobuf->dr_error = 0;
  86         iobuf->dr_dev = d;
  87         iobuf->dr_frags = 0;
  88         iobuf->dr_elapsed = ktime_set(0, 0);
  89         /* must be counted before, so assert */
  90         iobuf->dr_rw = rw;
  91         iobuf->dr_init_at = line;
  92
  93         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
  94         if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
  95                 LASSERT(iobuf->dr_pg_buf.lb_len >=
  96                         pages * sizeof(iobuf->dr_pages[0]));
  97                 return 0;
  98         }
  99
 100         /* start with 1MB for 4K blocks */
 101         i = 256;
 102         while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
 103                 i <<= 1;
 104
 105         CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
 106                (unsigned int)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
 107         pages = i;
 108         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
 109         iobuf->dr_max_pages = 0;
 110         CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
 111                (unsigned int)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
 112
 113         lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
 114         iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
 115         if (unlikely(iobuf->dr_blocks == NULL))
 116                 return -ENOMEM;
 117
 118         lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0]));
 119         iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf;
 120         if (unlikely(iobuf->dr_pages == NULL))
 121                 return -ENOMEM;
 122
 123         lu_buf_realloc(&iobuf->dr_lnb_buf,
 124                        pages * sizeof(iobuf->dr_lnbs[0]));
 125         iobuf->dr_lnbs = iobuf->dr_lnb_buf.lb_buf;
 126         if (unlikely(iobuf->dr_lnbs == NULL))
 127                 return -ENOMEM;
 128
 129         iobuf->dr_max_pages = pages;
 130
 131         return 0;
 132 }
 133 #define osd_init_iobuf(dev, iobuf, rw, pages) \
 134         __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
 135
 136 static void osd_iobuf_add_page(struct osd_iobuf *iobuf,
 137                                struct niobuf_local *lnb)
 138 {
 139         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
 140         iobuf->dr_pages[iobuf->dr_npages] = lnb->lnb_page;
 141         iobuf->dr_lnbs[iobuf->dr_npages] = lnb;
 142         iobuf->dr_npages++;
 143 }
 144
 145 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
 146 {
 147         int rw = iobuf->dr_rw;
 148
 149         if (iobuf->dr_elapsed_valid) {
 150                 iobuf->dr_elapsed_valid = 0;
 151                 LASSERT(iobuf->dr_dev == d);
 152                 LASSERT(iobuf->dr_frags > 0);
 153                 lprocfs_oh_tally(&d->od_brw_stats.hist[BRW_R_DIO_FRAGS+rw],
 154                                  iobuf->dr_frags);
 155                 lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw],
 156                                       ktime_to_ms(iobuf->dr_elapsed));
 157         }
 158 }
 159
 160 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 161 static void dio_complete_routine(struct bio *bio)
 162 {
 163         int error = blk_status_to_errno(bio->bi_status);
 164 #else
 165 static void dio_complete_routine(struct bio *bio, int error)
 166 {
 167 #endif
 168         struct osd_iobuf *iobuf = bio->bi_private;
 169         struct bio_vec *bvl;
 170
 171         /* CAVEAT EMPTOR: possibly in IRQ context
 172          * DO NOT record procfs stats here!!!
 173          */
 174
 175         if (unlikely(iobuf == NULL)) {
 176                 CERROR("***** bio->bi_private is NULL!  This should never happen.  Normally, I would crash here, but instead I will dump the bio contents to the console.  Please report this to <https://jira.whamcloud.com/> , along with any interesting messages leading up to this point (like SCSI errors, perhaps).  Because bi_private is NULL, I can't wake up the thread that initiated this IO - you will probably have to reboot this node.\n");
 177                 CERROR("bi_next: %p, bi_flags: %lx, " __stringify(bi_opf)
 178                        ": %x, bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, bi_private: %p\n",
 179                        bio->bi_next, (unsigned long)bio->bi_flags,
 180                        (unsigned int)bio->bi_opf, bio->bi_vcnt, bio_idx(bio),
 181                        bio_sectors(bio) << 9, bio->bi_end_io,
 182                        atomic_read(&bio->__bi_cnt),
 183                        bio->bi_private);
 184                 return;
 185         }
 186
 187         /* the check is outside of the cycle for performance reason -bzzz */
 188         if (!bio_data_dir(bio)) {
 189                 DECLARE_BVEC_ITER_ALL(iter_all);
 190
 191                 bio_for_each_segment_all(bvl, bio, iter_all) {
 192                         if (likely(error == 0))
 193                                 SetPageUptodate(bvl_to_page(bvl));
 194                         LASSERT(PageLocked(bvl_to_page(bvl)));
 195                 }
 196                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
 197         } else {
 198                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
 199         }
 200
 201         /* any real error is good enough -bzzz */
 202         if (error != 0 && iobuf->dr_error == 0)
 203                 iobuf->dr_error = error;
 204
 205         /*
 206          * set dr_elapsed before dr_numreqs turns to 0, otherwise
 207          * it's possible that service thread will see dr_numreqs
 208          * is zero, but dr_elapsed is not set yet, leading to lost
 209          * data in this processing and an assertion in a subsequent
 210          * call to OSD.
 211          */
 212         if (atomic_read(&iobuf->dr_numreqs) == 1) {
 213                 ktime_t now = ktime_get();
 214
 215                 iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time);
 216                 iobuf->dr_elapsed_valid = 1;
 217         }
 218         if (atomic_dec_and_test(&iobuf->dr_numreqs))
 219                 wake_up(&iobuf->dr_wait);
 220
 221         /* Completed bios used to be chained off iobuf->dr_bios and freed in
 222          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
 223          * mempool when serious on-disk fragmentation was encountered,
 224          * deadlocking the OST.  The bios are now released as soon as complete
 225          * so the pool cannot be exhausted while IOs are competing. b=10076
 226          */
 227         bio_put(bio);
 228 }
 229
 230 static void record_start_io(struct osd_iobuf *iobuf, int size)
 231 {
 232         struct osd_device    *osd = iobuf->dr_dev;
 233         struct obd_histogram *h = osd->od_brw_stats.hist;
 234
 235         iobuf->dr_frags++;
 236         atomic_inc(&iobuf->dr_numreqs);
 237
 238         if (iobuf->dr_rw == 0) {
 239                 atomic_inc(&osd->od_r_in_flight);
 240                 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
 241                                  atomic_read(&osd->od_r_in_flight));
 242                 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
 243         } else if (iobuf->dr_rw == 1) {
 244                 atomic_inc(&osd->od_w_in_flight);
 245                 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
 246                                  atomic_read(&osd->od_w_in_flight));
 247                 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
 248         } else {
 249                 LBUG();
 250         }
 251 }
 252
 253 static void osd_submit_bio(int rw, struct bio *bio)
 254 {
 255         LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
 256 #ifdef HAVE_SUBMIT_BIO_2ARGS
 257         submit_bio(rw ? WRITE : READ, bio);
 258 #else
 259         bio->bi_opf |= rw;
 260         submit_bio(bio);
 261 #endif
 262 }
 263
 264 static int can_be_merged(struct bio *bio, sector_t sector)
 265 {
 266         if (bio == NULL)
 267                 return 0;
 268
 269         return bio_end_sector(bio) == sector ? 1 : 0;
 270 }
 271
 272 #if IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)
 273 /*
 274  * This function will change the data written, thus it should only be
 275  * used when checking data integrity feature
 276  */
 277 static void bio_integrity_fault_inject(struct bio *bio)
 278 {
 279         struct bio_vec *bvec;
 280         DECLARE_BVEC_ITER_ALL(iter_all);
 281         void *kaddr;
 282         char *addr;
 283
 284         bio_for_each_segment_all(bvec, bio, iter_all) {
 285                 struct page *page = bvec->bv_page;
 286
 287                 kaddr = kmap(page);
 288                 addr = kaddr;
 289                 *addr = ~(*addr);
 290                 kunmap(page);
 291                 break;
 292         }
 293 }
 294
 295 static int bio_dif_compare(__u16 *expected_guard_buf, void *bio_prot_buf,
 296                            unsigned int sectors, int tuple_size)
 297 {
 298         __u16 *expected_guard;
 299         __u16 *bio_guard;
 300         int i;
 301
 302         expected_guard = expected_guard_buf;
 303         for (i = 0; i < sectors; i++) {
 304                 bio_guard = (__u16 *)bio_prot_buf;
 305                 if (*bio_guard != *expected_guard) {
 306                         CERROR(
 307                                "unexpected guard tags on sector %d expected guard %u, bio guard %u, sectors %u, tuple size %d\n",
 308                                i, *expected_guard, *bio_guard, sectors,
 309                                tuple_size);
 310                         return -EIO;
 311                 }
 312                 expected_guard++;
 313                 bio_prot_buf += tuple_size;
 314         }
 315         return 0;
 316 }
 317
 318 static int osd_bio_integrity_compare(struct bio *bio, struct block_device *bdev,
 319                                      struct osd_iobuf *iobuf, int index)
 320 {
 321         struct blk_integrity *bi = bdev_get_integrity(bdev);
 322         struct bio_integrity_payload *bip = bio->bi_integrity;
 323         struct niobuf_local *lnb;
 324         unsigned short sector_size = blk_integrity_interval(bi);
 325         void *bio_prot_buf = page_address(bip->bip_vec->bv_page) +
 326                 bip->bip_vec->bv_offset;
 327         struct bio_vec *bv;
 328         sector_t sector = bio_start_sector(bio);
 329         unsigned int sectors, total;
 330         DECLARE_BVEC_ITER_ALL(iter_all);
 331         __u16 *expected_guard;
 332         int rc;
 333
 334         total = 0;
 335         bio_for_each_segment_all(bv, bio, iter_all) {
 336                 lnb = iobuf->dr_lnbs[index];
 337                 expected_guard = lnb->lnb_guards;
 338                 sectors = bv->bv_len / sector_size;
 339                 if (lnb->lnb_guard_rpc) {
 340                         rc = bio_dif_compare(expected_guard, bio_prot_buf,
 341                                              sectors, bi->tuple_size);
 342                         if (rc)
 343                                 return rc;
 344                 }
 345
 346                 sector += sectors;
 347                 bio_prot_buf += sectors * bi->tuple_size;
 348                 total += sectors * bi->tuple_size;
 349                 LASSERT(total <= bip_size(bio->bi_integrity));
 350                 index++;
 351         }
 352         return 0;
 353 }
 354
 355 static int osd_bio_integrity_handle(struct osd_device *osd, struct bio *bio,
 356                                     struct osd_iobuf *iobuf,
 357                                     int start_page_idx, bool fault_inject,
 358                                     bool integrity_enabled)
 359 {
 360         struct super_block *sb = osd_sb(osd);
 361         integrity_gen_fn *generate_fn = NULL;
 362         integrity_vrfy_fn *verify_fn = NULL;
 363         int rc;
 364
 365         ENTRY;
 366
 367         if (!integrity_enabled)
 368                 RETURN(0);
 369
 370         rc = osd_get_integrity_profile(osd, &generate_fn, &verify_fn);
 371         if (rc)
 372                 RETURN(rc);
 373
 374         rc = bio_integrity_prep_fn(bio, generate_fn, verify_fn);
 375         if (rc)
 376                 RETURN(rc);
 377
 378         /* Verify and inject fault only when writing */
 379         if (iobuf->dr_rw == 1) {
 380                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_CMP))) {
 381                         rc = osd_bio_integrity_compare(bio, sb->s_bdev, iobuf,
 382                                                        start_page_idx);
 383                         if (rc)
 384                                 RETURN(rc);
 385                 }
 386
 387                 if (unlikely(fault_inject))
 388                         bio_integrity_fault_inject(bio);
 389         }
 390
 391         RETURN(0);
 392 }
 393
 394 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 395 #  ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 396 static void dio_integrity_complete_routine(struct bio *bio)
 397 #  else
 398 static void dio_integrity_complete_routine(struct bio *bio, int error)
 399 #  endif
 400 {
 401         struct osd_bio_private *bio_private = bio->bi_private;
 402
 403         bio->bi_private = bio_private->obp_iobuf;
 404         osd_dio_complete_routine(bio, error);
 405
 406         OBD_FREE_PTR(bio_private);
 407 }
 408 #endif /* HAVE_BIO_INTEGRITY_PREP_FN */
 409 #else  /* !CONFIG_BLK_DEV_INTEGRITY */
 410 #define osd_bio_integrity_handle(osd, bio, iobuf, start_page_idx, \
 411                                  fault_inject, integrity_enabled) 0
 412 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 413
 414 static int osd_bio_init(struct bio *bio, struct osd_iobuf *iobuf,
 415                         bool integrity_enabled, int start_page_idx,
 416                         struct osd_bio_private **pprivate)
 417 {
 418         ENTRY;
 419
 420         *pprivate = NULL;
 421
 422 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 423         if (integrity_enabled) {
 424                 struct osd_bio_private *bio_private = NULL;
 425
 426                 OBD_ALLOC_GFP(bio_private, sizeof(*bio_private), GFP_NOIO);
 427                 if (bio_private == NULL)
 428                         RETURN(-ENOMEM);
 429                 bio->bi_end_io = dio_integrity_complete_routine;
 430                 bio->bi_private = bio_private;
 431                 bio_private->obp_start_page_idx = start_page_idx;
 432                 bio_private->obp_iobuf = iobuf;
 433                 *pprivate = bio_private;
 434         } else
 435 #endif
 436         {
 437                 bio->bi_end_io = dio_complete_routine;
 438                 bio->bi_private = iobuf;
 439         }
 440
 441         RETURN(0);
 442 }
 443
 444 static void osd_mark_page_io_done(struct osd_iobuf *iobuf,
 445                                   struct inode *inode,
 446                                   sector_t start_blocks,
 447                                   sector_t count)
 448 {
 449         struct niobuf_local *lnb;
 450         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 451         pgoff_t pg_start, pg_end;
 452
 453         pg_start = start_blocks / blocks_per_page;
 454         if (start_blocks % blocks_per_page)
 455                 pg_start++;
 456         if (count >= blocks_per_page)
 457                 pg_end = (start_blocks + count -
 458                           blocks_per_page) / blocks_per_page;
 459         else
 460                 return; /* nothing to mark */
 461         for ( ; pg_start <= pg_end; pg_start++) {
 462                 lnb = iobuf->dr_lnbs[pg_start];
 463                 lnb->lnb_flags |= OBD_BRW_DONE;
 464         }
 465 }
 466
 467 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
 468                       struct osd_iobuf *iobuf, sector_t start_blocks,
 469                       sector_t count)
 470 {
 471         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 472         struct page **pages = iobuf->dr_pages;
 473         int npages = iobuf->dr_npages;
 474         sector_t *blocks = iobuf->dr_blocks;
 475         struct super_block *sb = inode->i_sb;
 476         int sector_bits = sb->s_blocksize_bits - 9;
 477         unsigned int blocksize = sb->s_blocksize;
 478         struct block_device *bdev = sb->s_bdev;
 479         struct osd_bio_private *bio_private = NULL;
 480         struct bio *bio = NULL;
 481         int bio_start_page_idx;
 482         struct page *page;
 483         unsigned int page_offset;
 484         sector_t sector;
 485         int nblocks;
 486         int block_idx, block_idx_end;
 487         int page_idx, page_idx_start;
 488         int i;
 489         int rc = 0;
 490         bool fault_inject;
 491         bool integrity_enabled;
 492         struct blk_plug plug;
 493         int blocks_left_page;
 494
 495         ENTRY;
 496
 497         fault_inject = OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT);
 498         LASSERT(iobuf->dr_npages == npages);
 499
 500         integrity_enabled = bdev_integrity_enabled(bdev, iobuf->dr_rw);
 501
 502         osd_brw_stats_update(osd, iobuf);
 503         iobuf->dr_start_time = ktime_get();
 504
 505         if (!count)
 506                 count = npages * blocks_per_page;
 507         block_idx_end = start_blocks + count;
 508
 509         blk_start_plug(&plug);
 510
 511         page_idx_start = start_blocks / blocks_per_page;
 512         for (page_idx = page_idx_start, block_idx = start_blocks;
 513              block_idx < block_idx_end; page_idx++,
 514              block_idx += blocks_left_page) {
 515                 page = pages[page_idx];
 516                 LASSERT(page_idx < iobuf->dr_npages);
 517
 518                 i = block_idx % blocks_per_page;
 519                 blocks_left_page = blocks_per_page - i;
 520                 for (page_offset = i * blocksize; i < blocks_left_page;
 521                      i += nblocks, page_offset += blocksize * nblocks) {
 522                         nblocks = 1;
 523
 524                         if (blocks[block_idx + i] == 0) {  /* hole */
 525                                 LASSERTF(iobuf->dr_rw == 0,
 526                                          "page_idx %u, block_idx %u, i %u,"
 527                                          "start_blocks: %llu, count: %llu, npages: %d\n",
 528                                          page_idx, block_idx, i,
 529                                          (unsigned long long)start_blocks,
 530                                          (unsigned long long)count, npages);
 531                                 memset(kmap(page) + page_offset, 0, blocksize);
 532                                 kunmap(page);
 533                                 continue;
 534                         }
 535
 536                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
 537
 538                         /* Additional contiguous file blocks? */
 539                         while (i + nblocks < blocks_left_page &&
 540                                (sector + (nblocks << sector_bits)) ==
 541                                ((sector_t)blocks[block_idx + i + nblocks] <<
 542                                  sector_bits))
 543                                 nblocks++;
 544
 545                         if (bio && can_be_merged(bio, sector) &&
 546                             bio_add_page(bio, page, blocksize * nblocks,
 547                                          page_offset) != 0)
 548                                 continue;       /* added this frag OK */
 549
 550                         if (bio != NULL) {
 551                                 struct request_queue *q = bio_get_queue(bio);
 552                                 unsigned int bi_size = bio_sectors(bio) << 9;
 553
 554                                 /* Dang! I have to fragment this I/O */
 555                                 CDEBUG(D_INODE,
 556                                        "bio++ sz %d vcnt %d(%d) sectors %d(%d) psg %d(%d)\n",
 557                                        bi_size, bio->bi_vcnt, bio->bi_max_vecs,
 558                                        bio_sectors(bio),
 559                                        queue_max_sectors(q),
 560                                        osd_bio_nr_segs(bio),
 561                                        queue_max_segments(q));
 562                                 rc = osd_bio_integrity_handle(osd, bio,
 563                                         iobuf, bio_start_page_idx,
 564                                         fault_inject, integrity_enabled);
 565                                 if (rc) {
 566                                         bio_put(bio);
 567                                         goto out;
 568                                 }
 569
 570                                 record_start_io(iobuf, bi_size);
 571                                 osd_submit_bio(iobuf->dr_rw, bio);
 572                         }
 573
 574                         bio_start_page_idx = page_idx;
 575                         /* allocate new bio */
 576                         bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
 577                                         (block_idx_end - block_idx +
 578                                          blocks_left_page - 1)));
 579                         if (bio == NULL) {
 580                                 CERROR("Can't allocate bio %u pages\n",
 581                                        block_idx_end - block_idx +
 582                                        blocks_left_page - 1);
 583                                 rc = -ENOMEM;
 584                                 goto out;
 585                         }
 586
 587                         bio_set_dev(bio, bdev);
 588                         bio_set_sector(bio, sector);
 589                         bio->bi_opf = iobuf->dr_rw ? WRITE : READ;
 590                         rc = osd_bio_init(bio, iobuf, integrity_enabled,
 591                                           bio_start_page_idx, &bio_private);
 592                         if (rc) {
 593                                 bio_put(bio);
 594                                 goto out;
 595                         }
 596
 597                         rc = bio_add_page(bio, page,
 598                                           blocksize * nblocks, page_offset);
 599                         LASSERT(rc != 0);
 600                 }
 601         }
 602
 603         if (bio != NULL) {
 604                 rc = osd_bio_integrity_handle(osd, bio, iobuf,
 605                                               bio_start_page_idx,
 606                                               fault_inject,
 607                                               integrity_enabled);
 608                 if (rc) {
 609                         bio_put(bio);
 610                         goto out;
 611                 }
 612
 613                 record_start_io(iobuf, bio_sectors(bio) << 9);
 614                 osd_submit_bio(iobuf->dr_rw, bio);
 615                 rc = 0;
 616         }
 617
 618 out:
 619         blk_finish_plug(&plug);
 620
 621         /* in order to achieve better IO throughput, we don't wait for writes
 622          * completion here. instead we proceed with transaction commit in
 623          * parallel and wait for IO completion once transaction is stopped
 624          * see osd_trans_stop() for more details -bzzz
 625          */
 626         if (iobuf->dr_rw == 0 || fault_inject) {
 627                 wait_event(iobuf->dr_wait,
 628                            atomic_read(&iobuf->dr_numreqs) == 0);
 629                 osd_fini_iobuf(osd, iobuf);
 630         }
 631
 632         if (rc == 0) {
 633                 rc = iobuf->dr_error;
 634         } else {
 635                 if (bio_private)
 636                         OBD_FREE_PTR(bio_private);
 637         }
 638
 639         /* Write only now */
 640         if (rc == 0 && iobuf->dr_rw)
 641                 osd_mark_page_io_done(iobuf, inode,
 642                                       start_blocks, count);
 643
 644         RETURN(rc);
 645 }
 646
 647 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
 648                                    struct niobuf_local *lnb, int maxlnb)
 649 {
 650         int rc = 0;
 651         ENTRY;
 652
 653         *nrpages = 0;
 654
 655         while (len > 0) {
 656                 int poff = offset & (PAGE_SIZE - 1);
 657                 int plen = PAGE_SIZE - poff;
 658
 659                 if (*nrpages >= maxlnb) {
 660                         rc = -EOVERFLOW;
 661                         break;
 662                 }
 663
 664                 if (plen > len)
 665                         plen = len;
 666                 lnb->lnb_file_offset = offset;
 667                 lnb->lnb_page_offset = poff;
 668                 lnb->lnb_len = plen;
 669                 /* lnb->lnb_flags = rnb->rnb_flags; */
 670                 lnb->lnb_flags = 0;
 671                 lnb->lnb_page = NULL;
 672                 lnb->lnb_rc = 0;
 673                 lnb->lnb_guard_rpc = 0;
 674                 lnb->lnb_guard_disk = 0;
 675                 lnb->lnb_locked = 0;
 676
 677                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
 678                          (long long) len);
 679                 offset += plen;
 680                 len -= plen;
 681                 lnb++;
 682                 (*nrpages)++;
 683         }
 684
 685         RETURN(rc);
 686 }
 687
 688 static struct page *osd_get_page(const struct lu_env *env, struct dt_object *dt,
 689                                  loff_t offset, gfp_t gfp_mask, bool cache)
 690 {
 691         struct osd_thread_info *oti = osd_oti_get(env);
 692         struct inode *inode = osd_dt_obj(dt)->oo_inode;
 693         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
 694         struct page *page;
 695         int cur;
 696
 697         LASSERT(inode);
 698
 699         if (cache) {
 700                 page = find_or_create_page(inode->i_mapping,
 701                                            offset >> PAGE_SHIFT, gfp_mask);
 702
 703                 if (likely(page)) {
 704                         LASSERT(!PagePrivate2(page));
 705                         wait_on_page_writeback(page);
 706                 } else {
 707                         lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
 708                 }
 709
 710                 return page;
 711         }
 712
 713         if (inode->i_mapping->nrpages) {
 714                 /* consult with pagecache, but do not create new pages */
 715                 /* this is normally used once */
 716                 page = find_lock_page(inode->i_mapping, offset >> PAGE_SHIFT);
 717                 if (page) {
 718                         wait_on_page_writeback(page);
 719                         return page;
 720                 }
 721         }
 722
 723         LASSERT(oti->oti_dio_pages);
 724         cur = oti->oti_dio_pages_used;
 725         page = oti->oti_dio_pages[cur];
 726
 727         if (unlikely(!page)) {
 728                 LASSERT(cur < PTLRPC_MAX_BRW_PAGES);
 729                 page = alloc_page(gfp_mask);
 730                 if (!page)
 731                         return NULL;
 732                 oti->oti_dio_pages[cur] = page;
 733                 SetPagePrivate2(page);
 734                 lock_page(page);
 735         }
 736
 737         ClearPageUptodate(page);
 738         page->index = offset >> PAGE_SHIFT;
 739         oti->oti_dio_pages_used++;
 740
 741         return page;
 742 }
 743
 744 /*
 745  * there are following "locks":
 746  * journal_start
 747  * i_mutex
 748  * page lock
 749  *
 750  * osd write path:
 751  *  - lock page(s)
 752  *  - journal_start
 753  *  - truncate_sem
 754  *
 755  * ext4 vmtruncate:
 756  *  - lock pages, unlock
 757  *  - journal_start
 758  *  - lock partial page
 759  *  - i_data_sem
 760  *
 761  */
 762
 763 /**
 764  * Unlock and release pages loaded by osd_bufs_get()
 765  *
 766  * Unlock \a npages pages from \a lnb and drop the refcount on them.
 767  *
 768  * \param env           thread execution environment
 769  * \param dt            dt object undergoing IO (OSD object + methods)
 770  * \param lnb           array of pages undergoing IO
 771  * \param npages        number of pages in \a lnb
 772  *
 773  * \retval 0            always
 774  */
 775 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
 776                         struct niobuf_local *lnb, int npages)
 777 {
 778         struct osd_thread_info *oti = osd_oti_get(env);
 779         struct pagevec pvec;
 780         int i;
 781
 782         ll_pagevec_init(&pvec, 0);
 783
 784         for (i = 0; i < npages; i++) {
 785                 struct page *page = lnb[i].lnb_page;
 786
 787                 if (page == NULL)
 788                         continue;
 789
 790                 /* if the page isn't cached, then reset uptodate
 791                  * to prevent reuse
 792                  */
 793                 if (PagePrivate2(page)) {
 794                         oti->oti_dio_pages_used--;
 795                 } else {
 796                         if (lnb[i].lnb_locked)
 797                                 unlock_page(page);
 798                         if (pagevec_add(&pvec, page) == 0)
 799                                 pagevec_release(&pvec);
 800                 }
 801
 802                 lnb[i].lnb_page = NULL;
 803         }
 804
 805         LASSERTF(oti->oti_dio_pages_used == 0, "%d\n", oti->oti_dio_pages_used);
 806
 807         /* Release any partial pagevec */
 808         pagevec_release(&pvec);
 809
 810         RETURN(0);
 811 }
 812
 813 /**
 814  * Load and lock pages undergoing IO
 815  *
 816  * Pages as described in the \a lnb array are fetched (from disk or cache)
 817  * and locked for IO by the caller.
 818  *
 819  * DLM locking protects us from write and truncate competing for same region,
 820  * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
 821  * It's possible the writeout on a such a page is in progress when we access
 822  * it. It's also possible that during this writeout we put new (partial) data
 823  * into the page, but won't be able to proceed in filter_commitrw_write().
 824  * Therefore, just wait for writeout completion as it should be rare enough.
 825  *
 826  * \param env           thread execution environment
 827  * \param dt            dt object undergoing IO (OSD object + methods)
 828  * \param pos           byte offset of IO start
 829  * \param len           number of bytes of IO
 830  * \param lnb           array of extents undergoing IO
 831  * \param rw            read or write operation, and other flags
 832  * \param capa          capabilities
 833  *
 834  * \retval pages        (zero or more) loaded successfully
 835  * \retval -ENOMEM      on memory/page allocation error
 836  */
 837 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
 838                         loff_t pos, ssize_t len, struct niobuf_local *lnb,
 839                         int maxlnb, enum dt_bufs_type rw)
 840 {
 841         struct osd_thread_info *oti = osd_oti_get(env);
 842         struct osd_object *obj = osd_dt_obj(dt);
 843         struct osd_device *osd   = osd_obj2dev(obj);
 844         int npages, i, iosize, rc = 0;
 845         bool cache, write;
 846         loff_t fsize;
 847         gfp_t gfp_mask;
 848
 849         LASSERT(obj->oo_inode);
 850
 851         rc = osd_map_remote_to_local(pos, len, &npages, lnb, maxlnb);
 852         if (rc)
 853                 RETURN(rc);
 854
 855         write = rw & DT_BUFS_TYPE_WRITE;
 856
 857         fsize = lnb[npages - 1].lnb_file_offset + lnb[npages - 1].lnb_len;
 858         iosize = fsize - lnb[0].lnb_file_offset;
 859         fsize = max(fsize, i_size_read(obj->oo_inode));
 860
 861         cache = rw & DT_BUFS_TYPE_READAHEAD;
 862         if (cache)
 863                 goto bypass_checks;
 864
 865         cache = osd_use_page_cache(osd);
 866         while (cache) {
 867                 if (write) {
 868                         if (!osd->od_writethrough_cache) {
 869                                 cache = false;
 870                                 break;
 871                         }
 872                         if (iosize > osd->od_writethrough_max_iosize) {
 873                                 cache = false;
 874                                 break;
 875                         }
 876                 } else {
 877                         if (!osd->od_read_cache) {
 878                                 cache = false;
 879                                 break;
 880                         }
 881                         if (iosize > osd->od_readcache_max_iosize) {
 882                                 cache = false;
 883                                 break;
 884                         }
 885                 }
 886                 /* don't use cache on large files */
 887                 if (osd->od_readcache_max_filesize &&
 888                     fsize > osd->od_readcache_max_filesize)
 889                         cache = false;
 890                 break;
 891         }
 892
 893 bypass_checks:
 894         if (!cache && unlikely(!oti->oti_dio_pages)) {
 895                 OBD_ALLOC_PTR_ARRAY_LARGE(oti->oti_dio_pages,
 896                                           PTLRPC_MAX_BRW_PAGES);
 897                 if (!oti->oti_dio_pages)
 898                         return -ENOMEM;
 899         }
 900
 901         /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
 902         gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
 903                                              GFP_HIGHUSER;
 904         for (i = 0; i < npages; i++, lnb++) {
 905                 lnb->lnb_page = osd_get_page(env, dt, lnb->lnb_file_offset,
 906                                              gfp_mask, cache);
 907                 if (lnb->lnb_page == NULL)
 908                         GOTO(cleanup, rc = -ENOMEM);
 909
 910                 lnb->lnb_locked = 1;
 911         }
 912
 913 #if 0
 914         /* XXX: this version doesn't invalidate cached pages, but use them */
 915         if (!cache && write && obj->oo_inode->i_mapping->nrpages) {
 916                 /* do not allow data aliasing, invalidate pagecache */
 917                 /* XXX: can be quite expensive in mixed case */
 918                 invalidate_mapping_pages(obj->oo_inode->i_mapping,
 919                                 lnb[0].lnb_file_offset >> PAGE_SHIFT,
 920                                 lnb[npages - 1].lnb_file_offset >> PAGE_SHIFT);
 921         }
 922 #endif
 923
 924         RETURN(i);
 925
 926 cleanup:
 927         if (i > 0)
 928                 osd_bufs_put(env, dt, lnb - i, i);
 929         return rc;
 930 }
 931 /* Borrow @ext4_chunk_trans_blocks */
 932 static int osd_chunk_trans_blocks(struct inode *inode, int nrblocks)
 933 {
 934         ldiskfs_group_t groups;
 935         int gdpblocks;
 936         int idxblocks;
 937         int depth;
 938         int ret;
 939
 940         depth = ext_depth(inode);
 941         idxblocks = depth * 2;
 942
 943         /*
 944          * Now let's see how many group bitmaps and group descriptors need
 945          * to account.
 946          */
 947         groups = idxblocks + 1;
 948         gdpblocks = groups;
 949         if (groups > LDISKFS_SB(inode->i_sb)->s_groups_count)
 950                 groups = LDISKFS_SB(inode->i_sb)->s_groups_count;
 951         if (gdpblocks > LDISKFS_SB(inode->i_sb)->s_gdb_count)
 952                 gdpblocks = LDISKFS_SB(inode->i_sb)->s_gdb_count;
 953
 954         /* bitmaps and block group descriptor blocks */
 955         ret = idxblocks + groups + gdpblocks;
 956
 957         /* Blocks for super block, inode, quota and xattr blocks */
 958         ret += LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
 959
 960         return ret;
 961 }
 962
 963 #ifdef HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS
 964 static int osd_extend_restart_trans(handle_t *handle, int needed,
 965                                     struct inode *inode)
 966 {
 967         int rc;
 968
 969         rc = ldiskfs_journal_ensure_credits(handle, needed,
 970                 ldiskfs_trans_default_revoke_credits(inode->i_sb));
 971         /* this means journal has been restarted */
 972         if (rc > 0)
 973                 rc = 0;
 974
 975         return rc;
 976 }
 977 #else
 978 static int osd_extend_restart_trans(handle_t *handle, int needed,
 979                                     struct inode *inode)
 980 {
 981         int rc;
 982
 983         if (ldiskfs_handle_has_enough_credits(handle, needed))
 984                 return 0;
 985         rc = ldiskfs_journal_extend(handle,
 986                                 needed - handle->h_buffer_credits);
 987         if (rc <= 0)
 988                 return rc;
 989
 990         return ldiskfs_journal_restart(handle, needed);
 991 }
 992 #endif /* HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS */
 993
 994 static int osd_ldiskfs_map_write(struct inode *inode, struct osd_iobuf *iobuf,
 995                                  struct osd_device *osd, sector_t start_blocks,
 996                                  sector_t count, loff_t *disk_size,
 997                                  __u64 user_size)
 998 {
 999         /* if file has grown, take user_size into account */
1000         if (user_size && *disk_size > user_size)
1001                 *disk_size = user_size;
1002
1003         spin_lock(&inode->i_lock);
1004         if (*disk_size > i_size_read(inode)) {
1005                 i_size_write(inode, *disk_size);
1006                 LDISKFS_I(inode)->i_disksize = *disk_size;
1007                 spin_unlock(&inode->i_lock);
1008                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
1009         } else {
1010                 spin_unlock(&inode->i_lock);
1011         }
1012
1013         /*
1014          * We don't do stats here as in read path because
1015          * write is async: we'll do this in osd_put_bufs()
1016          */
1017         return osd_do_bio(osd, inode, iobuf, start_blocks, count);
1018 }
1019
1020 static unsigned int osd_extent_bytes(const struct osd_device *o)
1021 {
1022         unsigned int *extent_bytes_ptr =
1023                         raw_cpu_ptr(o->od_extent_bytes_percpu);
1024
1025         if (likely(*extent_bytes_ptr))
1026                 return *extent_bytes_ptr;
1027
1028         /* initialize on first access or CPU hotplug */
1029         if (!ldiskfs_has_feature_extents(osd_sb(o)))
1030                 *extent_bytes_ptr = 1 << osd_sb(o)->s_blocksize_bits;
1031         else
1032                 *extent_bytes_ptr = OSD_DEFAULT_EXTENT_BYTES;
1033
1034         return *extent_bytes_ptr;
1035 }
1036
1037 #define EXTENT_BYTES_DECAY 64
1038 static void osd_decay_extent_bytes(struct osd_device *osd,
1039                                    unsigned int new_bytes)
1040 {
1041         unsigned int old_bytes;
1042
1043         if (!ldiskfs_has_feature_extents(osd_sb(osd)))
1044                 return;
1045
1046         old_bytes = osd_extent_bytes(osd);
1047         *raw_cpu_ptr(osd->od_extent_bytes_percpu) =
1048                 (old_bytes * (EXTENT_BYTES_DECAY - 1) +
1049                  min(new_bytes, OSD_DEFAULT_EXTENT_BYTES) +
1050                  EXTENT_BYTES_DECAY - 1) / EXTENT_BYTES_DECAY;
1051 }
1052
1053 static int osd_ldiskfs_map_inode_pages(struct inode *inode,
1054                                        struct osd_iobuf *iobuf,
1055                                        struct osd_device *osd,
1056                                        int create, __u64 user_size,
1057                                        int check_credits,
1058                                        struct thandle *thandle)
1059 {
1060         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
1061         int rc = 0, i = 0, mapped_index = 0;
1062         struct page *fp = NULL;
1063         int clen = 0;
1064         pgoff_t max_page_index;
1065         handle_t *handle = NULL;
1066         sector_t start_blocks = 0, count = 0;
1067         loff_t disk_size = 0;
1068         struct page **page = iobuf->dr_pages;
1069         int pages = iobuf->dr_npages;
1070         sector_t *blocks = iobuf->dr_blocks;
1071         struct niobuf_local *lnb1, *lnb2;
1072         loff_t size1, size2;
1073
1074         max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
1075
1076         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
1077                 inode->i_ino, pages, (*page)->index);
1078
1079         if (create) {
1080                 create = LDISKFS_GET_BLOCKS_CREATE;
1081                 handle = ldiskfs_journal_current_handle();
1082                 LASSERT(handle != NULL);
1083                 rc = osd_attach_jinode(inode);
1084                 if (rc)
1085                         return rc;
1086                 disk_size = i_size_read(inode);
1087                 /* if disk_size is already bigger than specified user_size,
1088                  * ignore user_size
1089                  */
1090                 if (disk_size > user_size)
1091                         user_size = 0;
1092         }
1093         /* pages are sorted already. so, we just have to find
1094          * contig. space and process them properly
1095          */
1096         while (i < pages) {
1097                 long blen, total = 0, previous_total = 0;
1098                 struct ldiskfs_map_blocks map = { 0 };
1099
1100                 if (fp == NULL) { /* start new extent */
1101                         fp = *page++;
1102                         clen = 1;
1103                         if (++i != pages)
1104                                 continue;
1105                 } else if (fp->index + clen == (*page)->index) {
1106                         /* continue the extent */
1107                         page++;
1108                         clen++;
1109                         if (++i != pages)
1110                                 continue;
1111                 }
1112                 if (fp->index + clen >= max_page_index)
1113                         GOTO(cleanup, rc = -EFBIG);
1114                 /* process found extent */
1115                 map.m_lblk = fp->index * blocks_per_page;
1116                 map.m_len = blen = clen * blocks_per_page;
1117 cont_map:
1118                 /**
1119                  * We might restart transaction for block allocations,
1120                  * in order to make sure data ordered mode, issue IO, disk
1121                  * size update and block allocations need be within same
1122                  * transaction to make sure consistency.
1123                  */
1124                 if (handle && check_credits) {
1125                         struct osd_thandle *oh;
1126
1127                         LASSERT(thandle != NULL);
1128                         oh = container_of(thandle, struct osd_thandle,
1129                                           ot_super);
1130                         /*
1131                          * only issue IO if restart transaction needed,
1132                          * as update disk size need hold inode lock, we
1133                          * want to avoid that as much as possible.
1134                          */
1135                         if (oh->oh_declared_ext <= 0) {
1136                                 rc = osd_ldiskfs_map_write(inode,
1137                                         iobuf, osd, start_blocks,
1138                                         count, &disk_size, user_size);
1139                                 if (rc)
1140                                         GOTO(cleanup, rc);
1141                                 thandle->th_restart_tran = 1;
1142                                 GOTO(cleanup, rc = -EAGAIN);
1143                         }
1144
1145                         if (OBD_FAIL_CHECK(OBD_FAIL_OST_RESTART_IO))
1146                                 oh->oh_declared_ext = 0;
1147                         else
1148                                 oh->oh_declared_ext--;
1149                 }
1150                 rc = ldiskfs_map_blocks(handle, inode, &map, create);
1151                 if (rc >= 0) {
1152                         int c = 0;
1153
1154                         for (; total < blen && c < map.m_len; c++, total++) {
1155                                 if (rc == 0) {
1156                                         *(blocks + total) = 0;
1157                                         total++;
1158                                         break;
1159                                 }
1160                                 if ((map.m_flags & LDISKFS_MAP_UNWRITTEN) &&
1161                                     !create) {
1162                                         /* don't try to read allocated, but
1163                                          * unwritten blocks, instead fill the
1164                                          * patches with zeros in osd_do_bio() */
1165                                         *(blocks + total) = 0;
1166                                         continue;
1167                                 }
1168                                 *(blocks + total) = map.m_pblk + c;
1169                                 /* unmap any possible underlying
1170                                  * metadata from the block device
1171                                  * mapping.  b=6998.
1172                                  */
1173                                 if ((map.m_flags & LDISKFS_MAP_NEW) &&
1174                                     create)
1175                                         clean_bdev_aliases(inode->i_sb->s_bdev,
1176                                                            map.m_pblk + c, 1);
1177                         }
1178                         rc = 0;
1179                 }
1180
1181                 if (rc == 0 && create) {
1182                         count += (total - previous_total);
1183                         mapped_index = (count + blocks_per_page -
1184                                         1) / blocks_per_page - 1;
1185                         lnb1 = iobuf->dr_lnbs[i - clen];
1186                         lnb2 = iobuf->dr_lnbs[mapped_index];
1187                         size1 = lnb1->lnb_file_offset -
1188                                 (lnb1->lnb_file_offset % PAGE_SIZE) +
1189                                 (total << inode->i_blkbits);
1190                         size2 = lnb2->lnb_file_offset + lnb2->lnb_len;
1191
1192                         if (size1 > size2)
1193                                 size1 = size2;
1194                         if (size1 > disk_size)
1195                                 disk_size = size1;
1196                 }
1197
1198                 if (rc == 0 && total < blen) {
1199                         /*
1200                          * decay extent blocks if we could not
1201                          * allocate extent once.
1202                          */
1203                         osd_decay_extent_bytes(osd,
1204                                 (total - previous_total) << inode->i_blkbits);
1205                         map.m_lblk = fp->index * blocks_per_page + total;
1206                         map.m_len = blen - total;
1207                         previous_total = total;
1208                         goto cont_map;
1209                 }
1210                 if (rc != 0)
1211                         GOTO(cleanup, rc);
1212                 /*
1213                  * decay extent blocks if we could allocate
1214                  * good large extent.
1215                  */
1216                 if (total - previous_total >=
1217                     osd_extent_bytes(osd) >> inode->i_blkbits)
1218                         osd_decay_extent_bytes(osd,
1219                                 (total - previous_total) << inode->i_blkbits);
1220                 /* look for next extent */
1221                 fp = NULL;
1222                 blocks += blocks_per_page * clen;
1223         }
1224 cleanup:
1225         if (rc == 0 && create &&
1226             start_blocks < pages * blocks_per_page) {
1227                 rc = osd_ldiskfs_map_write(inode, iobuf, osd, start_blocks,
1228                                            count, &disk_size, user_size);
1229                 LASSERT(start_blocks + count == pages * blocks_per_page);
1230         }
1231         return rc;
1232 }
1233
1234 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
1235                           struct niobuf_local *lnb, int npages)
1236 {
1237         struct osd_thread_info *oti   = osd_oti_get(env);
1238         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
1239         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
1240         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
1241         ktime_t start, end;
1242         s64 timediff;
1243         ssize_t isize;
1244         __s64  maxidx;
1245         int i, rc = 0;
1246
1247         LASSERT(inode);
1248
1249         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1250         if (unlikely(rc != 0))
1251                 RETURN(rc);
1252
1253         isize = i_size_read(inode);
1254         maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1255
1256         start = ktime_get();
1257         for (i = 0; i < npages; i++) {
1258
1259                 /*
1260                  * till commit the content of the page is undefined
1261                  * we'll set it uptodate once bulk is done. otherwise
1262                  * subsequent reads can access non-stable data
1263                  */
1264                 ClearPageUptodate(lnb[i].lnb_page);
1265
1266                 if (lnb[i].lnb_len == PAGE_SIZE)
1267                         continue;
1268
1269                 if (maxidx >= lnb[i].lnb_page->index) {
1270                         osd_iobuf_add_page(iobuf, &lnb[i]);
1271                 } else {
1272                         long off;
1273                         char *p = kmap(lnb[i].lnb_page);
1274
1275                         off = lnb[i].lnb_page_offset;
1276                         if (off)
1277                                 memset(p, 0, off);
1278                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1279                               ~PAGE_MASK;
1280                         if (off)
1281                                 memset(p + off, 0, PAGE_SIZE - off);
1282                         kunmap(lnb[i].lnb_page);
1283                 }
1284         }
1285         end = ktime_get();
1286         timediff = ktime_us_delta(end, start);
1287         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1288
1289         if (iobuf->dr_npages) {
1290                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1291                                                  0, 0, NULL);
1292                 if (likely(rc == 0)) {
1293                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1294                         /* do IO stats for preparation reads */
1295                         osd_fini_iobuf(osd, iobuf);
1296                 }
1297         }
1298         RETURN(rc);
1299 }
1300
1301 struct osd_fextent {
1302         sector_t        start;
1303         sector_t        end;
1304         __u32           flags;
1305         unsigned int    mapped:1;
1306 };
1307
1308 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1309                          struct osd_fextent *cached_extent)
1310 {
1311         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1312         sector_t block = offset >> inode->i_blkbits;
1313         sector_t start;
1314         struct fiemap_extent_info fei = { 0 };
1315         struct fiemap_extent fe = { 0 };
1316         mm_segment_t saved_fs;
1317         int rc;
1318
1319         if (block >= cached_extent->start && block < cached_extent->end)
1320                 return cached_extent->mapped;
1321
1322         if (i_size_read(inode) == 0)
1323                 return 0;
1324
1325         /* Beyond EOF, must not be mapped */
1326         if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1327                 return 0;
1328
1329         fei.fi_extents_max = 1;
1330         fei.fi_extents_start = &fe;
1331
1332         saved_fs = get_fs();
1333         set_fs(KERNEL_DS);
1334         rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1335         set_fs(saved_fs);
1336         if (rc != 0)
1337                 return 0;
1338
1339         start = fe.fe_logical >> inode->i_blkbits;
1340         cached_extent->flags = fe.fe_flags;
1341         if (fei.fi_extents_mapped == 0) {
1342                 /* a special case - no extent found at this offset and forward.
1343                  * we can consider this as a hole to EOF. it's safe to cache
1344                  * as other threads can not allocate/punch blocks this thread
1345                  * is working on (LDLM). */
1346                 cached_extent->start = block;
1347                 cached_extent->end = i_size_read(inode) >> inode->i_blkbits;
1348                 cached_extent->mapped = 0;
1349                 return 0;
1350         }
1351
1352         if (start > block) {
1353                 cached_extent->start = block;
1354                 cached_extent->end = start;
1355                 cached_extent->mapped = 0;
1356         } else {
1357                 cached_extent->start = start;
1358                 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1359                                       inode->i_blkbits;
1360                 cached_extent->mapped = 1;
1361         }
1362
1363         return cached_extent->mapped;
1364 }
1365
1366 #define MAX_EXTENTS_PER_WRITE 100
1367 static int osd_declare_write_commit(const struct lu_env *env,
1368                                     struct dt_object *dt,
1369                                     struct niobuf_local *lnb, int npages,
1370                                     struct thandle *handle)
1371 {
1372         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1373         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1374         struct osd_thandle      *oh;
1375         int                     extents = 0, new_meta = 0;
1376         int                     depth, new_blocks = 0;
1377         int                     i;
1378         int                     dirty_groups = 0;
1379         int                     rc = 0;
1380         int                     credits = 0;
1381         long long               quota_space = 0;
1382         struct osd_fextent      mapped = { 0 }, extent = { 0 };
1383         enum osd_quota_local_flags local_flags = 0;
1384         enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1385         unsigned int            extent_bytes;
1386         ENTRY;
1387
1388         LASSERT(handle != NULL);
1389         oh = container_of(handle, struct osd_thandle, ot_super);
1390         LASSERT(oh->ot_handle == NULL);
1391
1392         /*
1393          * We track a decaying average extent blocks per filesystem,
1394          * for most of time, it will be 1M, with filesystem becoming
1395          * heavily-fragmented, it will be reduced to 4K at the worst.
1396          */
1397         extent_bytes = osd_extent_bytes(osd);
1398         LASSERT(extent_bytes >= (1 << osd_sb(osd)->s_blocksize));
1399
1400         /* calculate number of extents (probably better to pass nb) */
1401         for (i = 0; i < npages; i++) {
1402                 /* ignore quota for the whole request if any page is from
1403                  * client cache or written by root.
1404                  *
1405                  * XXX once we drop the 1.8 client support, the checking
1406                  * for whether page is from cache can be simplified as:
1407                  * !(lnb[i].flags & OBD_BRW_SYNC)
1408                  *
1409                  * XXX we could handle this on per-lnb basis as done by
1410                  * grant.
1411                  */
1412                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1413                     (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1414                     OBD_BRW_FROM_GRANT)
1415                         declare_flags |= OSD_QID_FORCE;
1416
1417                 /*
1418                  * Convert unwritten extent might need split extents, could
1419                  * not skip it.
1420                  */
1421                 if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &mapped) &&
1422                     !(mapped.flags & FIEMAP_EXTENT_UNWRITTEN)) {
1423                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1424                         continue;
1425                 }
1426
1427                 if (lnb[i].lnb_flags & OBD_BRW_DONE) {
1428                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1429                         continue;
1430                 }
1431
1432                 /* count only unmapped changes */
1433                 new_blocks++;
1434                 if (lnb[i].lnb_file_offset != extent.end || extent.end == 0) {
1435                         if (extent.end != 0)
1436                                 extents += (extent.end - extent.start +
1437                                             extent_bytes - 1) / extent_bytes;
1438                         extent.start = lnb[i].lnb_file_offset;
1439                         extent.end = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1440                 } else {
1441                         extent.end += lnb[i].lnb_len;
1442                 }
1443
1444                 quota_space += PAGE_SIZE;
1445         }
1446
1447         credits++; /* inode */
1448         /*
1449          * overwrite case, no need to modify tree and
1450          * allocate blocks.
1451          */
1452         if (!extent.end)
1453                 goto out_declare;
1454
1455         extents += (extent.end - extent.start +
1456                     extent_bytes - 1) / extent_bytes;
1457         /**
1458          * with system space usage growing up, mballoc codes won't
1459          * try best to scan block group to align best free extent as
1460          * we can. So extent bytes per extent could be decayed to a
1461          * very small value, this could make us reserve too many credits.
1462          * We could be more optimistic in the credit reservations, even
1463          * in a case where the filesystem is nearly full, it is extremely
1464          * unlikely that the worst case would ever be hit.
1465          */
1466         if (extents > MAX_EXTENTS_PER_WRITE)
1467                 extents = MAX_EXTENTS_PER_WRITE;
1468
1469         /**
1470          * If we add a single extent, then in the worse case, each tree
1471          * level index/leaf need to be changed in case of the tree split.
1472          * If more extents are inserted, they could cause the whole tree
1473          * split more than once, but this is really rare.
1474          */
1475         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1476                 depth = ext_depth(inode);
1477                 if (extents <= 1) {
1478                         credits += depth * 2 * extents;
1479                         new_meta = depth;
1480                 } else {
1481                         credits += depth * 3 * extents;
1482                         new_meta = depth * 2 * extents;
1483                 }
1484         } else {
1485                 /*
1486                  * With N contiguous data blocks, we need at most
1487                  * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks,
1488                  * 2 dindirect blocks, and 1 tindirect block
1489                  */
1490                 new_meta = DIV_ROUND_UP(new_blocks,
1491                                 LDISKFS_ADDR_PER_BLOCK(inode->i_sb)) + 4;
1492                 credits += new_meta;
1493                 depth = 3;
1494         }
1495         dirty_groups += (extents + new_meta);
1496
1497         oh->oh_declared_ext = extents;
1498
1499         /* quota space for metadata blocks */
1500         quota_space += new_meta * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1501
1502         /* quota space should be reported in 1K blocks */
1503         quota_space = toqb(quota_space);
1504
1505         /* each new block can go in different group (bitmap + gd) */
1506
1507         /* we can't dirty more bitmap blocks than exist */
1508         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1509                 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1510         else
1511                 credits += dirty_groups;
1512
1513         /* we can't dirty more gd blocks than exist */
1514         if (extents > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1515                 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1516         else
1517                 credits += dirty_groups;
1518
1519         CDEBUG(D_INODE,
1520                "%s: inode #%lu extent_bytes %u extents %d credits %d\n",
1521                osd_ino2name(inode), inode->i_ino, extent_bytes, extents,
1522                credits);
1523
1524 out_declare:
1525         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1526
1527         /* make sure the over quota flags were not set */
1528         lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1529
1530         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1531                                    i_projid_read(inode), quota_space, oh,
1532                                    osd_dt_obj(dt), &local_flags, declare_flags);
1533
1534         /* we need only to store the overquota flags in the first lnb for
1535          * now, once we support multiple objects BRW, this code needs be
1536          * revised.
1537          */
1538         if (local_flags & QUOTA_FL_OVER_USRQUOTA)
1539                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1540         if (local_flags & QUOTA_FL_OVER_GRPQUOTA)
1541                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1542         if (local_flags & QUOTA_FL_OVER_PRJQUOTA)
1543                 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1544
1545         if (rc == 0)
1546                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, true);
1547
1548         RETURN(rc);
1549 }
1550
1551 /* Check if a block is allocated or not */
1552 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1553                             struct niobuf_local *lnb, int npages,
1554                             struct thandle *thandle, __u64 user_size)
1555 {
1556         struct osd_thread_info *oti = osd_oti_get(env);
1557         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1558         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1559         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1560         int rc = 0, i, check_credits = 0;
1561
1562         LASSERT(inode);
1563
1564         rc = osd_init_iobuf(osd, iobuf, 1, npages);
1565         if (unlikely(rc != 0))
1566                 RETURN(rc);
1567
1568         dquot_initialize(inode);
1569
1570         for (i = 0; i < npages; i++) {
1571                 if (lnb[i].lnb_rc == -ENOSPC &&
1572                     (lnb[i].lnb_flags & OBD_BRW_MAPPED)) {
1573                         /* Allow the write to proceed if overwriting an
1574                          * existing block
1575                          */
1576                         lnb[i].lnb_rc = 0;
1577                 }
1578
1579                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1580                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1581                                lnb[i].lnb_rc);
1582                         LASSERT(lnb[i].lnb_page);
1583                         generic_error_remove_page(inode->i_mapping,
1584                                                   lnb[i].lnb_page);
1585                         continue;
1586                 }
1587
1588                 if (lnb[i].lnb_flags & OBD_BRW_DONE)
1589                         continue;
1590
1591                 if (!(lnb[i].lnb_flags & OBD_BRW_MAPPED))
1592                         check_credits = 1;
1593
1594                 LASSERT(PageLocked(lnb[i].lnb_page));
1595                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1596
1597                 /*
1598                  * Since write and truncate are serialized by oo_sem, even
1599                  * partial-page truncate should not leave dirty pages in the
1600                  * page cache.
1601                  */
1602                 LASSERT(!PageDirty(lnb[i].lnb_page));
1603
1604                 SetPageUptodate(lnb[i].lnb_page);
1605
1606                 osd_iobuf_add_page(iobuf, &lnb[i]);
1607         }
1608
1609         osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1610
1611         if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1612                 rc = -ENOSPC;
1613         } else if (iobuf->dr_npages > 0) {
1614                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd,
1615                                                  1, user_size,
1616                                                  check_credits,
1617                                                  thandle);
1618         } else {
1619                 /* no pages to write, no transno is needed */
1620                 thandle->th_local = 1;
1621         }
1622
1623         if (rc != 0 && !thandle->th_restart_tran)
1624                 osd_fini_iobuf(osd, iobuf);
1625
1626         osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1627
1628         if (unlikely(rc != 0 && !thandle->th_restart_tran)) {
1629                 /* if write fails, we should drop pages from the cache */
1630                 for (i = 0; i < npages; i++) {
1631                         if (lnb[i].lnb_page == NULL)
1632                                 continue;
1633                         if (!PagePrivate2(lnb[i].lnb_page)) {
1634                                 LASSERT(PageLocked(lnb[i].lnb_page));
1635                                 generic_error_remove_page(inode->i_mapping,
1636                                                           lnb[i].lnb_page);
1637                         }
1638                 }
1639         }
1640
1641         RETURN(rc);
1642 }
1643
1644 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1645                          struct niobuf_local *lnb, int npages)
1646 {
1647         struct osd_thread_info *oti = osd_oti_get(env);
1648         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1649         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1650         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1651         int rc = 0, i, cache_hits = 0, cache_misses = 0;
1652         ktime_t start, end;
1653         s64 timediff;
1654         loff_t isize;
1655
1656         LASSERT(inode);
1657
1658         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1659         if (unlikely(rc != 0))
1660                 RETURN(rc);
1661
1662         isize = i_size_read(inode);
1663
1664         start = ktime_get();
1665         for (i = 0; i < npages; i++) {
1666
1667                 if (isize <= lnb[i].lnb_file_offset)
1668                         /* If there's no more data, abort early.
1669                          * lnb->lnb_rc == 0, so it's easy to detect later.
1670                          */
1671                         break;
1672
1673                 /* instead of looking if we go beyong isize, send complete
1674                  * pages all the time
1675                  */
1676                 lnb[i].lnb_rc = lnb[i].lnb_len;
1677
1678                 /* Bypass disk read if fail_loc is set properly */
1679                 if (OBD_FAIL_CHECK(OBD_FAIL_OST_FAKE_RW))
1680                         SetPageUptodate(lnb[i].lnb_page);
1681
1682                 if (PageUptodate(lnb[i].lnb_page)) {
1683                         cache_hits++;
1684                         unlock_page(lnb[i].lnb_page);
1685                 } else {
1686                         cache_misses++;
1687                         osd_iobuf_add_page(iobuf, &lnb[i]);
1688                 }
1689                 /* no need to unlock in osd_bufs_put(), the sooner page is
1690                  * unlocked, the earlier another client can access it.
1691                  * notice real unlock_page() can be called few lines
1692                  * below after osd_do_bio(). lnb is a per-thread, so it's
1693                  * fine to have PG_locked and lnb_locked inconsistent here
1694                  */
1695                 lnb[i].lnb_locked = 0;
1696         }
1697         end = ktime_get();
1698         timediff = ktime_us_delta(end, start);
1699         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1700
1701         if (cache_hits != 0)
1702                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1703                                     cache_hits);
1704         if (cache_misses != 0)
1705                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1706                                     cache_misses);
1707         if (cache_hits + cache_misses != 0)
1708                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1709                                     cache_hits + cache_misses);
1710
1711         if (iobuf->dr_npages) {
1712                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1713                                                  0, 0, NULL);
1714                 if (!rc)
1715                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1716
1717                 /* IO stats will be done in osd_bufs_put() */
1718
1719                 /* early release to let others read data during the bulk */
1720                 for (i = 0; i < iobuf->dr_npages; i++) {
1721                         LASSERT(PageLocked(iobuf->dr_pages[i]));
1722                         if (!PagePrivate2(iobuf->dr_pages[i]))
1723                                 unlock_page(iobuf->dr_pages[i]);
1724                 }
1725         }
1726
1727         RETURN(rc);
1728 }
1729
1730 /*
1731  * XXX: Another layering violation for now.
1732  *
1733  * We don't want to use ->f_op->read methods, because generic file write
1734  *
1735  *         - serializes on ->i_sem, and
1736  *
1737  *         - does a lot of extra work like balance_dirty_pages(),
1738  *
1739  * which doesn't work for globally shared files like /last_rcvd.
1740  */
1741 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1742 {
1743         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1744
1745         memcpy(buffer, (char *)ei->i_data, buflen);
1746
1747         return  buflen;
1748 }
1749
1750 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1751 {
1752         struct buffer_head *bh;
1753         unsigned long block;
1754         int osize;
1755         int blocksize;
1756         int csize;
1757         int boffs;
1758
1759         /* prevent reading after eof */
1760         spin_lock(&inode->i_lock);
1761         if (i_size_read(inode) < *offs + size) {
1762                 loff_t diff = i_size_read(inode) - *offs;
1763
1764                 spin_unlock(&inode->i_lock);
1765                 if (diff < 0) {
1766                         CDEBUG(D_OTHER,
1767                                "size %llu is too short to read @%llu\n",
1768                                i_size_read(inode), *offs);
1769                         return -EBADR;
1770                 } else if (diff == 0) {
1771                         return 0;
1772                 } else {
1773                         size = diff;
1774                 }
1775         } else {
1776                 spin_unlock(&inode->i_lock);
1777         }
1778
1779         blocksize = 1 << inode->i_blkbits;
1780         osize = size;
1781         while (size > 0) {
1782                 block = *offs >> inode->i_blkbits;
1783                 boffs = *offs & (blocksize - 1);
1784                 csize = min(blocksize - boffs, size);
1785                 bh = __ldiskfs_bread(NULL, inode, block, 0);
1786                 if (IS_ERR(bh)) {
1787                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1788                                osd_ino2name(inode), csize, *offs, inode->i_ino,
1789                                PTR_ERR(bh));
1790                         return PTR_ERR(bh);
1791                 }
1792
1793                 if (bh != NULL) {
1794                         memcpy(buf, bh->b_data + boffs, csize);
1795                         brelse(bh);
1796                 } else {
1797                         memset(buf, 0, csize);
1798                 }
1799
1800                 *offs += csize;
1801                 buf += csize;
1802                 size -= csize;
1803         }
1804         return osize;
1805 }
1806
1807 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1808                         struct lu_buf *buf, loff_t *pos)
1809 {
1810         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1811         int rc;
1812
1813         /* Read small symlink from inode body as we need to maintain correct
1814          * on-disk symlinks for ldiskfs.
1815          */
1816         if (S_ISLNK(dt->do_lu.lo_header->loh_attr)) {
1817                 loff_t size = i_size_read(inode);
1818
1819                 if (buf->lb_len < size)
1820                         return -EOVERFLOW;
1821
1822                 if (size < sizeof(LDISKFS_I(inode)->i_data))
1823                         rc = osd_ldiskfs_readlink(inode, buf->lb_buf, size);
1824                 else
1825                         rc = osd_ldiskfs_read(inode, buf->lb_buf, size, pos);
1826         } else {
1827                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1828         }
1829
1830         return rc;
1831 }
1832
1833 static inline int osd_extents_enabled(struct super_block *sb,
1834                                       struct inode *inode)
1835 {
1836         if (inode != NULL) {
1837                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1838                         return 1;
1839         } else if (ldiskfs_has_feature_extents(sb)) {
1840                 return 1;
1841         }
1842         return 0;
1843 }
1844
1845 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1846                            const loff_t size, const loff_t pos,
1847                            const int blocks)
1848 {
1849         int credits, bits, bs, i;
1850
1851         bits = sb->s_blocksize_bits;
1852         bs = 1 << bits;
1853
1854         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1855          * we do not expect blockmaps on the large files,
1856          * so let's shrink it to 2 levels (4GB files)
1857          */
1858
1859         /* this is default reservation: 2 levels */
1860         credits = (blocks + 2) * 3;
1861
1862         /* actual offset is unknown, hard to optimize */
1863         if (pos == -1)
1864                 return credits;
1865
1866         /* now check for few specific cases to optimize */
1867         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1868                 /* no indirects */
1869                 credits = blocks;
1870                 /* allocate if not allocated */
1871                 if (inode == NULL) {
1872                         credits += blocks * 2;
1873                         return credits;
1874                 }
1875                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1876                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1877                         if (LDISKFS_I(inode)->i_data[i] == 0)
1878                                 credits += 2;
1879                 }
1880         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1881                 /* single indirect */
1882                 credits = blocks * 3;
1883                 if (inode == NULL ||
1884                     LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1885                         credits += 3;
1886                 else
1887                         /* The indirect block may be modified. */
1888                         credits += 1;
1889         }
1890
1891         return credits;
1892 }
1893
1894 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1895                                  const struct lu_buf *buf, loff_t _pos,
1896                                  struct thandle *handle)
1897 {
1898         struct osd_object  *obj  = osd_dt_obj(dt);
1899         struct inode       *inode = obj->oo_inode;
1900         struct super_block *sb = osd_sb(osd_obj2dev(obj));
1901         struct osd_thandle *oh;
1902         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
1903         int                 bits, bs;
1904         int                 depth, size;
1905         loff_t              pos;
1906         ENTRY;
1907
1908         LASSERT(buf != NULL);
1909         LASSERT(handle != NULL);
1910
1911         oh = container_of(handle, struct osd_thandle, ot_super);
1912         LASSERT(oh->ot_handle == NULL);
1913
1914         size = buf->lb_len;
1915         bits = sb->s_blocksize_bits;
1916         bs = 1 << bits;
1917
1918         if (_pos == -1) {
1919                 /* if this is an append, then we
1920                  * should expect cross-block record
1921                  */
1922                 pos = 0;
1923         } else {
1924                 pos = _pos;
1925         }
1926
1927         /* blocks to modify */
1928         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1929         LASSERT(blocks > 0);
1930
1931         if (inode != NULL && _pos != -1) {
1932                 /* object size in blocks */
1933                 est = (i_size_read(inode) + bs - 1) >> bits;
1934                 allocated = inode->i_blocks >> (bits - 9);
1935                 if (pos + size <= i_size_read(inode) && est <= allocated) {
1936                         /* looks like an overwrite, no need to modify tree */
1937                         credits = blocks;
1938                         /* no need to modify i_size */
1939                         goto out;
1940                 }
1941         }
1942
1943         if (osd_extents_enabled(sb, inode)) {
1944                 /*
1945                  * many concurrent threads may grow tree by the time
1946                  * our transaction starts. so, consider 2 is a min depth
1947                  * for every level we may need to allocate a new block
1948                  * and take some entries from the old one. so, 3 blocks
1949                  * to allocate (bitmap, gd, itself) + old block - 4 per
1950                  * level.
1951                  */
1952                 depth = inode != NULL ? ext_depth(inode) : 0;
1953                 depth = max(depth, 1) + 1;
1954                 credits = depth;
1955                 /* if not append, then split may need to modify
1956                  * existing blocks moving entries into the new ones
1957                  */
1958                 if (_pos != -1)
1959                         credits += depth;
1960                 /* blocks to store data: bitmap,gd,itself */
1961                 credits += blocks * 3;
1962         } else {
1963                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1964         }
1965         /* if inode is created as part of the transaction,
1966          * then it's counted already by the creation method
1967          */
1968         if (inode != NULL)
1969                 credits++;
1970
1971 out:
1972
1973         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1974
1975         /* dt_declare_write() is usually called for system objects, such
1976          * as llog or last_rcvd files. We needn't enforce quota on those
1977          * objects, so always set the lqi_space as 0.
1978          */
1979         if (inode != NULL)
1980                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1981                                            i_gid_read(inode),
1982                                            i_projid_read(inode), 0,
1983                                            oh, obj, NULL, OSD_QID_BLK);
1984
1985         if (rc == 0)
1986                 rc = osd_trunc_lock(obj, oh, true);
1987
1988         RETURN(rc);
1989 }
1990
1991 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1992 {
1993         /* LU-2634: clear the extent format for fast symlink */
1994         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1995
1996         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1997         spin_lock(&inode->i_lock);
1998         LDISKFS_I(inode)->i_disksize = buflen;
1999         i_size_write(inode, buflen);
2000         spin_unlock(&inode->i_lock);
2001         osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2002
2003         return 0;
2004 }
2005
2006 static int osd_ldiskfs_write_record(struct dt_object *dt, void *buf,
2007                                     int bufsize, int write_NUL, loff_t *offs,
2008                                     handle_t *handle)
2009 {
2010         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2011         struct buffer_head *bh        = NULL;
2012         loff_t              offset    = *offs;
2013         loff_t              new_size  = i_size_read(inode);
2014         unsigned long       block;
2015         int                 blocksize = 1 << inode->i_blkbits;
2016         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2017         int                 err = 0;
2018         int                 size;
2019         int                 boffs;
2020         int                 dirty_inode = 0;
2021         bool create, sparse, sync = false;
2022
2023         if (write_NUL) {
2024                 /*
2025                  * long symlink write does not count the NUL terminator in
2026                  * bufsize, we write it, and the inode's file size does not
2027                  * count the NUL terminator as well.
2028                  */
2029                 ((char *)buf)[bufsize] = '\0';
2030                 ++bufsize;
2031         }
2032
2033         /* only the first flag-set matters */
2034         dirty_inode = !test_and_set_bit(LDISKFS_INODE_JOURNAL_DATA,
2035                                        &ei->i_flags);
2036
2037         /* sparse checking is racy, but sparse is very rare case, leave as is */
2038         sparse = (new_size > 0 && (inode->i_blocks >> (inode->i_blkbits - 9)) <
2039                   ((new_size - 1) >> inode->i_blkbits) + 1);
2040
2041         while (bufsize > 0) {
2042                 int credits = handle->h_buffer_credits;
2043                 unsigned long last_block = (new_size == 0) ? 0 :
2044                                            (new_size - 1) >> inode->i_blkbits;
2045
2046                 if (bh)
2047                         brelse(bh);
2048
2049                 block = offset >> inode->i_blkbits;
2050                 boffs = offset & (blocksize - 1);
2051                 size = min(blocksize - boffs, bufsize);
2052                 sync = (block > last_block || new_size == 0 || sparse);
2053
2054                 if (sync)
2055                         down(&ei->i_append_sem);
2056
2057                 bh = __ldiskfs_bread(handle, inode, block, 0);
2058
2059                 if (unlikely(IS_ERR_OR_NULL(bh) && !sync))
2060                         CWARN(
2061                               "%s: adding bh without locking off %llu (block %lu, size %d, offs %llu)\n",
2062                               osd_ino2name(inode),
2063                               offset, block, bufsize, *offs);
2064
2065                 if (IS_ERR_OR_NULL(bh)) {
2066                         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2067                         int flags = LDISKFS_GET_BLOCKS_CREATE;
2068
2069                         /* while the file system is being mounted, avoid
2070                          * preallocation otherwise mount can take a long
2071                          * time as mballoc cache is cold.
2072                          * XXX: this is a workaround until we have a proper
2073                          *      fix in mballoc
2074                          * XXX: works with extent-based files only */
2075                         if (!osd->od_cl_seq)
2076                                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2077                         bh = __ldiskfs_bread(handle, inode, block, flags);
2078                         create = true;
2079                 } else {
2080                         if (sync) {
2081                                 up(&ei->i_append_sem);
2082                                 sync = false;
2083                         }
2084                         create = false;
2085                 }
2086                 if (IS_ERR_OR_NULL(bh)) {
2087                         if (bh == NULL) {
2088                                 err = -EIO;
2089                         } else {
2090                                 err = PTR_ERR(bh);
2091                                 bh = NULL;
2092                         }
2093
2094                         CERROR(
2095                                "%s: error reading offset %llu (block %lu, size %d, offs %llu), credits %d/%d: rc = %d\n",
2096                                osd_ino2name(inode), offset, block, bufsize,
2097                                *offs, credits, handle->h_buffer_credits, err);
2098                         break;
2099                 }
2100
2101                 err = ldiskfs_journal_get_write_access(handle, bh);
2102                 if (err) {
2103                         CERROR("journal_get_write_access() returned error %d\n",
2104                                err);
2105                         break;
2106                 }
2107                 LASSERTF(boffs + size <= bh->b_size,
2108                          "boffs %d size %d bh->b_size %lu\n",
2109                          boffs, size, (unsigned long)bh->b_size);
2110                 if (create) {
2111                         memset(bh->b_data, 0, bh->b_size);
2112                         if (sync) {
2113                                 up(&ei->i_append_sem);
2114                                 sync = false;
2115                         }
2116                 }
2117                 memcpy(bh->b_data + boffs, buf, size);
2118                 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
2119                 if (err)
2120                         break;
2121
2122                 if (offset + size > new_size)
2123                         new_size = offset + size;
2124                 offset += size;
2125                 bufsize -= size;
2126                 buf += size;
2127         }
2128         if (sync)
2129                 up(&ei->i_append_sem);
2130
2131         if (bh)
2132                 brelse(bh);
2133
2134         if (write_NUL)
2135                 --new_size;
2136         /* correct in-core and on-disk sizes */
2137         if (new_size > i_size_read(inode)) {
2138                 spin_lock(&inode->i_lock);
2139                 if (new_size > i_size_read(inode))
2140                         i_size_write(inode, new_size);
2141                 if (i_size_read(inode) > ei->i_disksize) {
2142                         ei->i_disksize = i_size_read(inode);
2143                         dirty_inode = 1;
2144                 }
2145                 spin_unlock(&inode->i_lock);
2146         }
2147         if (dirty_inode)
2148                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2149
2150         if (err == 0)
2151                 *offs = offset;
2152         return err;
2153 }
2154
2155 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
2156                          const struct lu_buf *buf, loff_t *pos,
2157                          struct thandle *handle)
2158 {
2159         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
2160         struct osd_thandle      *oh;
2161         ssize_t                 result;
2162         int                     is_link;
2163
2164         LASSERT(dt_object_exists(dt));
2165
2166         LASSERT(handle != NULL);
2167         LASSERT(inode != NULL);
2168         dquot_initialize(inode);
2169
2170         /* XXX: don't check: one declared chunk can be used many times */
2171         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
2172
2173         oh = container_of(handle, struct osd_thandle, ot_super);
2174         LASSERT(oh->ot_handle->h_transaction != NULL);
2175         osd_trans_exec_op(env, handle, OSD_OT_WRITE);
2176
2177         /* Write small symlink to inode body as we need to maintain correct
2178          * on-disk symlinks for ldiskfs.
2179          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
2180          * does not count it in.
2181          */
2182         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
2183         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
2184                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
2185         else
2186                 result = osd_ldiskfs_write_record(dt, buf->lb_buf, buf->lb_len,
2187                                                   is_link, pos, oh->ot_handle);
2188         if (result == 0)
2189                 result = buf->lb_len;
2190
2191         osd_trans_exec_check(env, handle, OSD_OT_WRITE);
2192
2193         return result;
2194 }
2195
2196 static int osd_declare_fallocate(const struct lu_env *env,
2197                                  struct dt_object *dt, __u64 start, __u64 end,
2198                                  int mode, struct thandle *th)
2199 {
2200         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2201         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2202         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2203         long long quota_space = 0;
2204         /* 5 is max tree depth. (inode + 4 index blocks) */
2205         int depth = 5;
2206         int rc;
2207
2208         ENTRY;
2209
2210         /*
2211          * Only mode == 0 (which is standard prealloc) is supported now.
2212          * Rest of mode options is not supported yet.
2213          */
2214         if (mode & ~FALLOC_FL_KEEP_SIZE)
2215                 RETURN(-EOPNOTSUPP);
2216
2217         /* disable fallocate completely */
2218         if (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks < 0)
2219                 RETURN(-EOPNOTSUPP);
2220
2221         LASSERT(th);
2222         LASSERT(inode);
2223
2224         /* quota space for metadata blocks
2225          * approximate metadata estimate should be good enough.
2226          */
2227         quota_space += PAGE_SIZE;
2228         quota_space += depth * LDISKFS_BLOCK_SIZE(osd_sb(osd));
2229
2230         /* quota space should be reported in 1K blocks */
2231         quota_space = toqb(quota_space) + toqb(end - start) +
2232                       LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
2233
2234         /* We don't need to reserve credits for whole fallocate here.
2235          * We reserve space only for metadata. Fallocate credits are
2236          * extended as required
2237          */
2238         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2239                                    i_projid_read(inode), quota_space, oh,
2240                                    osd_dt_obj(dt), NULL, OSD_QID_BLK);
2241         RETURN(rc);
2242 }
2243
2244 static int osd_fallocate(const struct lu_env *env, struct dt_object *dt,
2245                          __u64 start, __u64 end, int mode, struct thandle *th)
2246 {
2247         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2248         handle_t *handle = ldiskfs_journal_current_handle();
2249         unsigned int save_credits = oh->ot_credits;
2250         struct osd_object *obj = osd_dt_obj(dt);
2251         struct inode *inode = obj->oo_inode;
2252         struct ldiskfs_map_blocks map;
2253         unsigned int credits;
2254         ldiskfs_lblk_t blen;
2255         ldiskfs_lblk_t boff;
2256         loff_t new_size = 0;
2257         int depth = 0;
2258         int flags;
2259         int rc = 0;
2260
2261         ENTRY;
2262
2263         LASSERT(dt_object_exists(dt));
2264         LASSERT(osd_invariant(obj));
2265         LASSERT(inode != NULL);
2266
2267         CDEBUG(D_INODE, "fallocate: inode #%lu: start %llu end %llu mode %d\n",
2268                inode->i_ino, start, end, mode);
2269
2270         dquot_initialize(inode);
2271
2272         LASSERT(th);
2273
2274         boff = start >> inode->i_blkbits;
2275         blen = (ALIGN(end, 1 << inode->i_blkbits) >> inode->i_blkbits) - boff;
2276
2277         /* Create and mark new extents as either zero or unwritten */
2278         flags = osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks ?
2279                 LDISKFS_GET_BLOCKS_CREATE_ZERO :
2280                 LDISKFS_GET_BLOCKS_CREATE_UNWRIT_EXT;
2281         if (mode & FALLOC_FL_KEEP_SIZE)
2282                 flags |= LDISKFS_GET_BLOCKS_KEEP_SIZE;
2283
2284         inode_lock(inode);
2285
2286         /*
2287          * We only support preallocation for extent-based file only.
2288          */
2289         if (!(ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS)))
2290                 GOTO(out, rc = -EOPNOTSUPP);
2291
2292         if (!(mode & FALLOC_FL_KEEP_SIZE) && (end > i_size_read(inode) ||
2293             end > LDISKFS_I(inode)->i_disksize)) {
2294                 new_size = end;
2295                 rc = inode_newsize_ok(inode, new_size);
2296                 if (rc)
2297                         GOTO(out, rc);
2298         }
2299
2300         inode_dio_wait(inode);
2301
2302         map.m_lblk = boff;
2303         map.m_len = blen;
2304
2305         /* Don't normalize the request if it can fit in one extent so
2306          * that it doesn't get unnecessarily split into multiple extents.
2307          */
2308         if (blen <= EXT_UNWRITTEN_MAX_LEN)
2309                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2310
2311         /*
2312          * credits to insert 1 extent into extent tree.
2313          */
2314         credits = osd_chunk_trans_blocks(inode, blen);
2315         depth = ext_depth(inode);
2316
2317         while (rc >= 0 && blen) {
2318                 loff_t epos;
2319
2320                 /*
2321                  * Recalculate credits when extent tree depth changes.
2322                  */
2323                 if (depth != ext_depth(inode)) {
2324                         credits = osd_chunk_trans_blocks(inode, blen);
2325                         depth = ext_depth(inode);
2326                 }
2327
2328                 /* TODO: quota check */
2329                 rc = osd_extend_restart_trans(handle, credits, inode);
2330                 if (rc)
2331                         break;
2332
2333                 rc = ldiskfs_map_blocks(handle, inode, &map, flags);
2334                 if (rc <= 0) {
2335                         CDEBUG(D_INODE,
2336                                "inode #%lu: block %u: len %u: ldiskfs_map_blocks returned %d\n",
2337                                inode->i_ino, map.m_lblk, map.m_len, rc);
2338                         ldiskfs_mark_inode_dirty(handle, inode);
2339                         break;
2340                 }
2341
2342                 map.m_lblk += rc;
2343                 map.m_len = blen = blen - rc;
2344                 epos = (loff_t)map.m_lblk << inode->i_blkbits;
2345                 inode->i_ctime = current_time(inode);
2346                 if (new_size) {
2347                         if (epos > end)
2348                                 epos = end;
2349                         if (ldiskfs_update_inode_size(inode, epos) & 0x1)
2350                                 inode->i_mtime = inode->i_ctime;
2351                 } else {
2352                         if (epos > inode->i_size)
2353                                 ldiskfs_set_inode_flag(inode,
2354                                                        LDISKFS_INODE_EOFBLOCKS);
2355                 }
2356
2357                 ldiskfs_mark_inode_dirty(handle, inode);
2358         }
2359
2360 out:
2361         /* extand credits if needed for operations such as attribute set */
2362         if (rc >= 0)
2363                 rc = osd_extend_restart_trans(handle, save_credits, inode);
2364
2365         inode_unlock(inode);
2366
2367         RETURN(rc);
2368 }
2369
2370 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
2371                              __u64 start, __u64 end, struct thandle *th)
2372 {
2373         struct osd_thandle *oh;
2374         struct inode       *inode;
2375         int                 rc;
2376         ENTRY;
2377
2378         LASSERT(th);
2379         oh = container_of(th, struct osd_thandle, ot_super);
2380
2381         /*
2382          * we don't need to reserve credits for whole truncate
2383          * it's not possible as truncate may need to free too many
2384          * blocks and that won't fit a single transaction. instead
2385          * we reserve credits to change i_size and put inode onto
2386          * orphan list. if needed truncate will extend or restart
2387          * transaction
2388          */
2389         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
2390                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
2391
2392         inode = osd_dt_obj(dt)->oo_inode;
2393         LASSERT(inode);
2394
2395         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2396                                    i_projid_read(inode), 0, oh, osd_dt_obj(dt),
2397                                    NULL, OSD_QID_BLK);
2398
2399         if (rc == 0)
2400                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
2401
2402         RETURN(rc);
2403 }
2404
2405 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
2406                      __u64 start, __u64 end, struct thandle *th)
2407 {
2408         struct osd_object *obj = osd_dt_obj(dt);
2409         struct osd_device *osd = osd_obj2dev(obj);
2410         struct inode *inode = obj->oo_inode;
2411         struct osd_access_lock *al;
2412         struct osd_thandle *oh;
2413         int rc = 0, found = 0;
2414         bool grow = false;
2415         ENTRY;
2416
2417         LASSERT(dt_object_exists(dt));
2418         LASSERT(osd_invariant(obj));
2419         LASSERT(inode != NULL);
2420         dquot_initialize(inode);
2421
2422         LASSERT(th);
2423         oh = container_of(th, struct osd_thandle, ot_super);
2424         LASSERT(oh->ot_handle->h_transaction != NULL);
2425
2426         /* we used to skip truncate to current size to
2427          * optimize truncates on OST. with DoM we can
2428          * get attr_set to set specific size (MDS_REINT)
2429          * and then get truncate RPC which essentially
2430          * would be skipped. this is bad.. so, disable
2431          * this optimization on MDS till the client stop
2432          * to sent MDS_REINT (LU-11033) -bzzz
2433          */
2434         if (osd->od_is_ost && i_size_read(inode) == start)
2435                 RETURN(0);
2436
2437         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
2438
2439         spin_lock(&inode->i_lock);
2440         if (i_size_read(inode) < start)
2441                 grow = true;
2442         i_size_write(inode, start);
2443         spin_unlock(&inode->i_lock);
2444         /* if object holds encrypted content, we need to make sure we truncate
2445          * on an encryption unit boundary, or subsequent reads will get
2446          * corrupted content
2447          */
2448         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2449             start & ~LUSTRE_ENCRYPTION_MASK)
2450                 start = (start & LUSTRE_ENCRYPTION_MASK) +
2451                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2452         ll_truncate_pagecache(inode, start);
2453
2454         /* optimize grow case */
2455         if (grow) {
2456                 osd_execute_truncate(obj);
2457                 GOTO(out, rc);
2458         }
2459
2460         inode_lock(inode);
2461         /* add to orphan list to ensure truncate completion
2462          * if this transaction succeed. ldiskfs_truncate()
2463          * will take the inode out of the list
2464          */
2465         rc = ldiskfs_orphan_add(oh->ot_handle, inode);
2466         inode_unlock(inode);
2467         if (rc != 0)
2468                 GOTO(out, rc);
2469
2470         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2471                 if (obj != al->tl_obj)
2472                         continue;
2473                 LASSERT(al->tl_shared == 0);
2474                 found = 1;
2475                 /* do actual truncate in osd_trans_stop() */
2476                 al->tl_truncate = 1;
2477                 break;
2478         }
2479         LASSERT(found);
2480
2481 out:
2482         RETURN(rc);
2483 }
2484
2485 static int fiemap_check_ranges(struct inode *inode,
2486                                u64 start, u64 len, u64 *new_len)
2487 {
2488         loff_t maxbytes;
2489
2490         *new_len = len;
2491
2492         if (len == 0)
2493                 return -EINVAL;
2494
2495         if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
2496                 maxbytes = inode->i_sb->s_maxbytes;
2497         else
2498                 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
2499
2500         if (start > maxbytes)
2501                 return -EFBIG;
2502
2503         /*
2504          * Shrink request scope to what the fs can actually handle.
2505          */
2506         if (len > maxbytes || (maxbytes - len) < start)
2507                 *new_len = maxbytes - start;
2508
2509         return 0;
2510 }
2511
2512 /* So that the fiemap access checks can't overflow on 32 bit machines. */
2513 #define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
2514
2515 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
2516                           struct fiemap *fm)
2517 {
2518         struct fiemap_extent_info fieinfo = {0, };
2519         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2520         u64 len;
2521         int rc;
2522         mm_segment_t cur_fs;
2523
2524         LASSERT(inode);
2525         if (inode->i_op->fiemap == NULL)
2526                 return -EOPNOTSUPP;
2527
2528         if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
2529                 return -EINVAL;
2530
2531         rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
2532         if (rc)
2533                 return rc;
2534
2535         fieinfo.fi_flags = fm->fm_flags;
2536         fieinfo.fi_extents_max = fm->fm_extent_count;
2537         fieinfo.fi_extents_start = fm->fm_extents;
2538
2539         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
2540                 filemap_write_and_wait(inode->i_mapping);
2541
2542         /* Save previous value address limit */
2543         cur_fs = get_fs();
2544         /* Set the address limit of the kernel */
2545         set_fs(KERNEL_DS);
2546
2547         rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
2548         fm->fm_flags = fieinfo.fi_flags;
2549         fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
2550
2551         /* Restore the previous address limt */
2552         set_fs(cur_fs);
2553
2554         return rc;
2555 }
2556
2557 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
2558                        __u64 start, __u64 end, enum lu_ladvise_type advice)
2559 {
2560         struct osd_object *obj = osd_dt_obj(dt);
2561         int rc = 0;
2562         ENTRY;
2563
2564         switch (advice) {
2565         case LU_LADVISE_DONTNEED:
2566                 if (end)
2567                         invalidate_mapping_pages(obj->oo_inode->i_mapping,
2568                                                  start >> PAGE_SHIFT,
2569                                                  (end - 1) >> PAGE_SHIFT);
2570                 break;
2571         default:
2572                 rc = -ENOTSUPP;
2573                 break;
2574         }
2575
2576         RETURN(rc);
2577 }
2578
2579 static loff_t osd_lseek(const struct lu_env *env, struct dt_object *dt,
2580                         loff_t offset, int whence)
2581 {
2582         struct osd_object *obj = osd_dt_obj(dt);
2583         struct inode *inode = obj->oo_inode;
2584         struct file *file;
2585         loff_t result;
2586
2587         ENTRY;
2588
2589         LASSERT(dt_object_exists(dt));
2590         LASSERT(osd_invariant(obj));
2591         LASSERT(inode);
2592         LASSERT(offset >= 0);
2593
2594         file = osd_quasi_file(env, inode);
2595         result = file->f_op->llseek(file, offset, whence);
2596
2597         /*
2598          * If 'offset' is beyond end of object file then treat it as not error
2599          * but valid case for SEEK_HOLE and return 'offset' as result.
2600          * LOV will decide if it is beyond real end of file or not.
2601          */
2602         if (whence == SEEK_HOLE && result == -ENXIO)
2603                 result = offset;
2604
2605         CDEBUG(D_INFO, "seek %s from %lld: %lld\n", whence == SEEK_HOLE ?
2606                        "hole" : "data", offset, result);
2607         RETURN(result);
2608 }
2609
2610 /*
2611  * in some cases we may need declare methods for objects being created
2612  * e.g., when we create symlink
2613  */
2614 const struct dt_body_operations osd_body_ops_new = {
2615         .dbo_declare_write = osd_declare_write,
2616 };
2617
2618 const struct dt_body_operations osd_body_ops = {
2619         .dbo_read                       = osd_read,
2620         .dbo_declare_write              = osd_declare_write,
2621         .dbo_write                      = osd_write,
2622         .dbo_bufs_get                   = osd_bufs_get,
2623         .dbo_bufs_put                   = osd_bufs_put,
2624         .dbo_write_prep                 = osd_write_prep,
2625         .dbo_declare_write_commit       = osd_declare_write_commit,
2626         .dbo_write_commit               = osd_write_commit,
2627         .dbo_read_prep                  = osd_read_prep,
2628         .dbo_declare_punch              = osd_declare_punch,
2629         .dbo_punch                      = osd_punch,
2630         .dbo_fiemap_get                 = osd_fiemap_get,
2631         .dbo_ladvise                    = osd_ladvise,
2632         .dbo_declare_fallocate          = osd_declare_fallocate,
2633         .dbo_fallocate                  = osd_fallocate,
2634         .dbo_lseek                      = osd_lseek,
2635 };
2636
2637 /**
2638  * Get a truncate lock
2639  *
2640  * In order to take multi-transaction truncate out of main transaction we let
2641  * the caller grab a lock on the object passed. the lock can be shared (for
2642  * writes) and exclusive (for truncate). It's not allowed to mix truncate
2643  * and write in the same transaction handle (do not confuse with big ldiskfs
2644  * transaction containing lots of handles).
2645  * The lock must be taken at declaration.
2646  *
2647  * \param obj           object to lock
2648  * \oh                  transaction
2649  * \shared              shared or exclusive
2650  *
2651  * \retval 0            lock is granted
2652  * \retval -NOMEM       no memory to allocate lock
2653  */
2654 int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared)
2655 {
2656         struct osd_access_lock *al, *tmp;
2657
2658         LASSERT(obj);
2659         LASSERT(oh);
2660
2661         list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) {
2662                 if (tmp->tl_obj != obj)
2663                         continue;
2664                 LASSERT(tmp->tl_shared == shared);
2665                 /* found same lock */
2666                 return 0;
2667         }
2668
2669         OBD_ALLOC_PTR(al);
2670         if (unlikely(al == NULL))
2671                 return -ENOMEM;
2672         al->tl_obj = obj;
2673         al->tl_truncate = false;
2674         if (shared)
2675                 down_read(&obj->oo_ext_idx_sem);
2676         else
2677                 down_write(&obj->oo_ext_idx_sem);
2678         al->tl_shared = shared;
2679         lu_object_get(&obj->oo_dt.do_lu);
2680
2681         list_add(&al->tl_list, &oh->ot_trunc_locks);
2682
2683         return 0;
2684 }
2685
2686 void osd_trunc_unlock_all(const struct lu_env *env, struct list_head *list)
2687 {
2688         struct osd_access_lock *al, *tmp;
2689
2690         list_for_each_entry_safe(al, tmp, list, tl_list) {
2691                 if (al->tl_shared)
2692                         up_read(&al->tl_obj->oo_ext_idx_sem);
2693                 else
2694                         up_write(&al->tl_obj->oo_ext_idx_sem);
2695                 osd_object_put(env, al->tl_obj);
2696                 list_del(&al->tl_list);
2697                 OBD_FREE_PTR(al);
2698         }
2699 }
2700
2701 void osd_execute_truncate(struct osd_object *obj)
2702 {
2703         struct osd_device *d = osd_obj2dev(obj);
2704         struct inode *inode = obj->oo_inode;
2705         __u64 size;
2706
2707         /* simulate crash before (in the middle) of delayed truncate */
2708         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) {
2709                 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2710                 struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb);
2711
2712                 mutex_lock(&sbi->s_orphan_lock);
2713                 list_del_init(&ei->i_orphan);
2714                 mutex_unlock(&sbi->s_orphan_lock);
2715                 return;
2716         }
2717
2718         size = i_size_read(inode);
2719         inode_lock(inode);
2720         /* if object holds encrypted content, we need to make sure we truncate
2721          * on an encryption unit boundary, or block content will get corrupted
2722          */
2723         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2724             size & ~LUSTRE_ENCRYPTION_MASK)
2725                 inode->i_size = (size & LUSTRE_ENCRYPTION_MASK) +
2726                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2727         ldiskfs_truncate(inode);
2728         inode_unlock(inode);
2729         if (inode->i_size != size) {
2730                 spin_lock(&inode->i_lock);
2731                 i_size_write(inode, size);
2732                 LDISKFS_I(inode)->i_disksize = size;
2733                 spin_unlock(&inode->i_lock);
2734                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2735         }
2736
2737         /*
2738          * For a partial-page truncate, flush the page to disk immediately to
2739          * avoid data corruption during direct disk write.  b=17397
2740          */
2741         if ((size & ~PAGE_MASK) == 0)
2742                 return;
2743         if (osd_use_page_cache(d)) {
2744                 filemap_fdatawrite_range(inode->i_mapping, size, size + 1);
2745         } else {
2746                 /* Notice we use "wait" version to ensure I/O is complete */
2747                 filemap_write_and_wait_range(inode->i_mapping, size, size + 1);
2748                 invalidate_mapping_pages(inode->i_mapping, size >> PAGE_SHIFT,
2749                                          size >> PAGE_SHIFT);
2750         }
2751 }
2752
2753 void osd_process_truncates(struct list_head *list)
2754 {
2755         struct osd_access_lock *al;
2756
2757         LASSERT(journal_current_handle() == NULL);
2758
2759         list_for_each_entry(al, list, tl_list) {
2760                 if (al->tl_shared)
2761                         continue;
2762                 if (!al->tl_truncate)
2763                         continue;
2764                 osd_execute_truncate(al->tl_obj);
2765         }
2766 }