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  *
  31  * lustre/osd/osd_io.c
  32  *
  33  * body operations
  34  *
  35  * Author: Nikita Danilov <nikita@clusterfs.com>
  36  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  37  *
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_OSD
  41
  42 /* prerequisite for linux/xattr.h */
  43 #include <linux/types.h>
  44 /* prerequisite for linux/xattr.h */
  45 #include <linux/fs.h>
  46 #include <linux/mm.h>
  47 #include <linux/swap.h>
  48 #include <linux/pagevec.h>
  49
  50 /*
  51  * struct OBD_{ALLOC,FREE}*()
  52  */
  53 #include <obd_support.h>
  54 #include <libcfs/libcfs.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                 struct brw_stats *h = &d->od_brw_stats;
 151
 152                 iobuf->dr_elapsed_valid = 0;
 153                 LASSERT(iobuf->dr_dev == d);
 154                 LASSERT(iobuf->dr_frags > 0);
 155                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_DIO_FRAGS+rw],
 156                                       iobuf->dr_frags);
 157                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_IO_TIME+rw],
 158                                            ktime_to_ms(iobuf->dr_elapsed));
 159         }
 160 }
 161
 162 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 163 static void dio_complete_routine(struct bio *bio)
 164 {
 165         int error = blk_status_to_errno(bio->bi_status);
 166 #else
 167 static void dio_complete_routine(struct bio *bio, int error)
 168 {
 169 #endif
 170         struct osd_iobuf *iobuf = bio->bi_private;
 171         struct bio_vec *bvl;
 172
 173         /* CAVEAT EMPTOR: possibly in IRQ context
 174          * DO NOT record procfs stats here!!!
 175          */
 176
 177         if (unlikely(iobuf == NULL)) {
 178                 CERROR("***** bio->bi_private is NULL! Dump the bio contents to the console. Please report this to <https://jira.whamcloud.com/>, and probably have to reboot this node.\n");
 179                 CERROR("bi_next: %p, bi_flags: %lx, " __stringify(bi_opf)
 180                        ": %x, bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, bi_private: %p\n",
 181                        bio->bi_next, (unsigned long)bio->bi_flags,
 182                        (unsigned int)bio->bi_opf, bio->bi_vcnt, bio_idx(bio),
 183                        bio_sectors(bio) << 9, bio->bi_end_io,
 184                        atomic_read(&bio->__bi_cnt),
 185                        bio->bi_private);
 186                 return;
 187         }
 188
 189         /* the check is outside of the cycle for performance reason -bzzz */
 190         if (!bio_data_dir(bio)) {
 191                 DECLARE_BVEC_ITER_ALL(iter_all);
 192
 193                 bio_for_each_segment_all(bvl, bio, iter_all) {
 194                         if (likely(error == 0))
 195                                 SetPageUptodate(bvl_to_page(bvl));
 196                         LASSERT(PageLocked(bvl_to_page(bvl)));
 197                 }
 198                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
 199         } else {
 200                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
 201         }
 202
 203         /* any real error is good enough -bzzz */
 204         if (error != 0 && iobuf->dr_error == 0)
 205                 iobuf->dr_error = error;
 206
 207         /*
 208          * set dr_elapsed before dr_numreqs turns to 0, otherwise
 209          * it's possible that service thread will see dr_numreqs
 210          * is zero, but dr_elapsed is not set yet, leading to lost
 211          * data in this processing and an assertion in a subsequent
 212          * call to OSD.
 213          */
 214         if (atomic_read(&iobuf->dr_numreqs) == 1) {
 215                 ktime_t now = ktime_get();
 216
 217                 iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time);
 218                 iobuf->dr_elapsed_valid = 1;
 219         }
 220         if (atomic_dec_and_test(&iobuf->dr_numreqs))
 221                 wake_up(&iobuf->dr_wait);
 222
 223         /* Completed bios used to be chained off iobuf->dr_bios and freed in
 224          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
 225          * mempool when serious on-disk fragmentation was encountered,
 226          * deadlocking the OST.  The bios are now released as soon as complete
 227          * so the pool cannot be exhausted while IOs are competing. b=10076
 228          */
 229         bio_put(bio);
 230 }
 231
 232 static void record_start_io(struct osd_iobuf *iobuf, int size)
 233 {
 234         struct osd_device *osd = iobuf->dr_dev;
 235         struct brw_stats *h = &osd->od_brw_stats;
 236
 237         iobuf->dr_frags++;
 238         atomic_inc(&iobuf->dr_numreqs);
 239
 240         if (iobuf->dr_rw == 0) {
 241                 atomic_inc(&osd->od_r_in_flight);
 242                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_RPC_HIST],
 243                                  atomic_read(&osd->od_r_in_flight));
 244                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_DISK_IOSIZE],
 245                                            size);
 246         } else if (iobuf->dr_rw == 1) {
 247                 atomic_inc(&osd->od_w_in_flight);
 248                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_W_RPC_HIST],
 249                                  atomic_read(&osd->od_w_in_flight));
 250                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_W_DISK_IOSIZE],
 251                                            size);
 252         } else {
 253                 LBUG();
 254         }
 255 }
 256
 257 static void osd_submit_bio(int rw, struct bio *bio)
 258 {
 259         LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
 260 #ifdef HAVE_SUBMIT_BIO_2ARGS
 261         submit_bio(rw ? WRITE : READ, bio);
 262 #else
 263         bio->bi_opf |= rw;
 264         submit_bio(bio);
 265 #endif
 266 }
 267
 268 static int can_be_merged(struct bio *bio, sector_t sector)
 269 {
 270         if (bio == NULL)
 271                 return 0;
 272
 273         return bio_end_sector(bio) == sector ? 1 : 0;
 274 }
 275
 276 #if IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)
 277 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 278 # ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 279 static void dio_integrity_complete_routine(struct bio *bio)
 280 # else
 281 static void dio_integrity_complete_routine(struct bio *bio, int error)
 282 # endif
 283 {
 284         struct osd_bio_private *bio_private = bio->bi_private;
 285
 286         bio->bi_private = bio_private->obp_iobuf;
 287         osd_dio_complete_routine(bio, error);
 288
 289         OBD_FREE_PTR(bio_private);
 290 }
 291
 292 /*
 293  * This function will change the data written, thus it should only be
 294  * used when checking data integrity feature
 295  */
 296 static void bio_integrity_fault_inject(struct bio *bio)
 297 {
 298         struct bio_vec *bvec;
 299         DECLARE_BVEC_ITER_ALL(iter_all);
 300         void *kaddr;
 301         char *addr;
 302
 303         bio_for_each_segment_all(bvec, bio, iter_all) {
 304                 struct page *page = bvec->bv_page;
 305
 306                 kaddr = kmap(page);
 307                 addr = kaddr;
 308                 *addr = ~(*addr);
 309                 kunmap(page);
 310                 break;
 311         }
 312 }
 313
 314 static int bio_dif_compare(__u16 *expected_guard_buf, void *bio_prot_buf,
 315                            unsigned int sectors, int tuple_size)
 316 {
 317         __be16 *expected_guard;
 318         __be16 *bio_guard;
 319         int i;
 320
 321         expected_guard = expected_guard_buf;
 322         for (i = 0; i < sectors; i++) {
 323                 bio_guard = (__u16 *)bio_prot_buf;
 324                 if (*bio_guard != *expected_guard) {
 325                         CERROR(
 326                                "unexpected guard tags on sector %d expected guard %u, bio guard %u, sectors %u, tuple size %d\n",
 327                                i, *expected_guard, *bio_guard, sectors,
 328                                tuple_size);
 329                         return -EIO;
 330                 }
 331                 expected_guard++;
 332                 bio_prot_buf += tuple_size;
 333         }
 334         return 0;
 335 }
 336
 337 static int osd_bio_integrity_compare(struct bio *bio, struct block_device *bdev,
 338                                      struct osd_iobuf *iobuf, int index)
 339 {
 340         struct blk_integrity *bi = bdev_get_integrity(bdev);
 341         struct bio_integrity_payload *bip = bio->bi_integrity;
 342         struct niobuf_local *lnb = NULL;
 343         unsigned short sector_size = blk_integrity_interval(bi);
 344         void *bio_prot_buf = page_address(bip->bip_vec->bv_page) +
 345                 bip->bip_vec->bv_offset;
 346         struct bio_vec *bv;
 347         sector_t sector = bio_start_sector(bio);
 348         unsigned int i, sectors, total;
 349         DECLARE_BVEC_ITER_ALL(iter_all);
 350         __be16 *expected_guard;
 351         int rc;
 352
 353         total = 0;
 354         bio_for_each_segment_all(bv, bio, iter_all) {
 355                 for (i = index; i < iobuf->dr_npages; i++) {
 356                         if (iobuf->dr_pages[i] == bv->bv_page) {
 357                                 lnb = iobuf->dr_lnbs[i];
 358                                 break;
 359                         }
 360                 }
 361                 if (!lnb)
 362                         continue;
 363                 expected_guard = lnb->lnb_guards;
 364                 sectors = bv->bv_len / sector_size;
 365                 if (lnb->lnb_guard_rpc) {
 366                         rc = bio_dif_compare(expected_guard, bio_prot_buf,
 367                                              sectors, bi->tuple_size);
 368                         if (rc)
 369                                 return rc;
 370                 }
 371
 372                 sector += sectors;
 373                 bio_prot_buf += sectors * bi->tuple_size;
 374                 total += sectors * bi->tuple_size;
 375                 LASSERT(total <= bip_size(bio->bi_integrity));
 376                 index++;
 377                 lnb = NULL;
 378         }
 379         return 0;
 380 }
 381 #endif /* HAVE_BIO_INTEGRITY_PREP_FN */
 382
 383 static int osd_bio_integrity_handle(struct osd_device *osd, struct bio *bio,
 384                                     struct osd_iobuf *iobuf,
 385                                     int start_page_idx, bool fault_inject,
 386                                     bool integrity_enabled)
 387 {
 388 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 389         struct super_block *sb = osd_sb(osd);
 390         integrity_gen_fn *generate_fn = NULL;
 391         integrity_vrfy_fn *verify_fn = NULL;
 392         int rc;
 393
 394         ENTRY;
 395
 396         if (!integrity_enabled)
 397                 RETURN(0);
 398
 399         rc = osd_get_integrity_profile(osd, &generate_fn, &verify_fn);
 400         if (rc)
 401                 RETURN(rc);
 402
 403 # ifdef HAVE_BIO_INTEGRITY_PREP_FN_RETURNS_BOOL
 404         if (!bio_integrity_prep_fn(bio, generate_fn, verify_fn))
 405                 RETURN(blk_status_to_errno(bio->bi_status));
 406 # else
 407         rc = bio_integrity_prep_fn(bio, generate_fn, verify_fn);
 408         if (rc)
 409                 RETURN(rc);
 410 # endif
 411
 412         /* Verify and inject fault only when writing */
 413         if (iobuf->dr_rw == 1) {
 414                 if (unlikely(CFS_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_CMP))) {
 415                         rc = osd_bio_integrity_compare(bio, sb->s_bdev, iobuf,
 416                                                        start_page_idx);
 417                         if (rc)
 418                                 RETURN(rc);
 419                 }
 420
 421                 if (unlikely(fault_inject))
 422                         bio_integrity_fault_inject(bio);
 423         }
 424 #endif /* HAVE_BIO_INTEGRITY_PREP_FN */
 425
 426         RETURN(0);
 427 }
 428 #else  /* !CONFIG_BLK_DEV_INTEGRITY */
 429 #define osd_bio_integrity_handle(osd, bio, iobuf, start_page_idx, \
 430                                  fault_inject, integrity_enabled) 0
 431 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 432
 433 static int osd_bio_init(struct bio *bio, struct osd_iobuf *iobuf,
 434                         bool integrity_enabled, int start_page_idx,
 435                         struct osd_bio_private **pprivate)
 436 {
 437         ENTRY;
 438
 439         *pprivate = NULL;
 440
 441 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 442         if (integrity_enabled) {
 443                 struct osd_bio_private *bio_private = NULL;
 444
 445                 OBD_ALLOC_GFP(bio_private, sizeof(*bio_private), GFP_NOIO);
 446                 if (bio_private == NULL)
 447                         RETURN(-ENOMEM);
 448                 bio->bi_end_io = dio_integrity_complete_routine;
 449                 bio->bi_private = bio_private;
 450                 bio_private->obp_start_page_idx = start_page_idx;
 451                 bio_private->obp_iobuf = iobuf;
 452                 *pprivate = bio_private;
 453         } else
 454 #endif
 455         {
 456                 bio->bi_end_io = dio_complete_routine;
 457                 bio->bi_private = iobuf;
 458         }
 459
 460         RETURN(0);
 461 }
 462
 463 static void osd_mark_page_io_done(struct osd_iobuf *iobuf,
 464                                   struct inode *inode,
 465                                   sector_t start_blocks,
 466                                   sector_t count)
 467 {
 468         struct niobuf_local *lnb;
 469         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 470         pgoff_t pg_start, pg_end;
 471
 472         pg_start = start_blocks / blocks_per_page;
 473         if (start_blocks % blocks_per_page)
 474                 pg_start++;
 475         if (count >= blocks_per_page)
 476                 pg_end = (start_blocks + count -
 477                           blocks_per_page) / blocks_per_page;
 478         else
 479                 return; /* nothing to mark */
 480         for ( ; pg_start <= pg_end; pg_start++) {
 481                 lnb = iobuf->dr_lnbs[pg_start];
 482                 lnb->lnb_flags |= OBD_BRW_DONE;
 483         }
 484 }
 485
 486 /*
 487  * Linux v5.12-rc1-20-ga8affc03a9b3
 488  *  block: rename BIO_MAX_PAGES to BIO_MAX_VECS
 489  */
 490 #ifndef BIO_MAX_VECS
 491 #define BIO_MAX_VECS    BIO_MAX_PAGES
 492 #endif
 493
 494 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
 495                       struct osd_iobuf *iobuf, sector_t start_blocks,
 496                       sector_t count)
 497 {
 498         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 499         struct page **pages = iobuf->dr_pages;
 500         int npages = iobuf->dr_npages;
 501         sector_t *blocks = iobuf->dr_blocks;
 502         struct super_block *sb = inode->i_sb;
 503         int sector_bits = sb->s_blocksize_bits - 9;
 504         unsigned int blocksize = sb->s_blocksize;
 505         struct block_device *bdev = sb->s_bdev;
 506         struct osd_bio_private *bio_private = NULL;
 507         struct bio *bio = NULL;
 508         int bio_start_page_idx;
 509         struct page *page;
 510         unsigned int page_offset;
 511         sector_t sector;
 512         int nblocks;
 513         int block_idx, block_idx_end;
 514         int page_idx, page_idx_start;
 515         int i;
 516         int rc = 0;
 517         bool fault_inject;
 518         bool integrity_enabled;
 519         struct blk_plug plug;
 520         int blocks_left_page;
 521
 522         ENTRY;
 523
 524         fault_inject = CFS_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT);
 525         LASSERT(iobuf->dr_npages == npages);
 526
 527         integrity_enabled = bdev_integrity_enabled(bdev, iobuf->dr_rw);
 528
 529         osd_brw_stats_update(osd, iobuf);
 530         iobuf->dr_start_time = ktime_get();
 531
 532         if (!count)
 533                 count = npages * blocks_per_page;
 534         block_idx_end = start_blocks + count;
 535
 536         blk_start_plug(&plug);
 537
 538         page_idx_start = start_blocks / blocks_per_page;
 539         for (page_idx = page_idx_start, block_idx = start_blocks;
 540              block_idx < block_idx_end; page_idx++,
 541              block_idx += blocks_left_page) {
 542                 /* For cases where the filesystems blocksize is not the
 543                  * same as PAGE_SIZE (e.g. ARM with PAGE_SIZE=64KB and
 544                  * blocksize=4KB), there will be multiple blocks to
 545                  * read/write per page. Also, the start and end block may
 546                  * not be aligned to the start and end of the page, so the
 547                  * first page may skip some blocks at the start ("i != 0",
 548                  * "blocks_left_page" is reduced), and the last page may
 549                  * skip some blocks at the end (limited by "count").
 550                  */
 551                 page = pages[page_idx];
 552                 LASSERT(page_idx < iobuf->dr_npages);
 553
 554                 i = block_idx % blocks_per_page;
 555                 blocks_left_page = blocks_per_page - i;
 556                 if (block_idx + blocks_left_page > block_idx_end)
 557                         blocks_left_page = block_idx_end - block_idx;
 558                 page_offset = i * blocksize;
 559                 for (i = 0; i < blocks_left_page;
 560                      i += nblocks, page_offset += blocksize * nblocks) {
 561                         nblocks = 1;
 562
 563                         if (blocks[block_idx + i] == 0) {  /* hole */
 564                                 LASSERTF(iobuf->dr_rw == 0,
 565                                          "page_idx %u, block_idx %u, i %u,"
 566                                          "start_blocks: %llu, count: %llu, npages: %d\n",
 567                                          page_idx, block_idx, i,
 568                                          (unsigned long long)start_blocks,
 569                                          (unsigned long long)count, npages);
 570                                 memset(kmap(page) + page_offset, 0, blocksize);
 571                                 kunmap(page);
 572                                 continue;
 573                         }
 574
 575                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
 576
 577                         /* Additional contiguous file blocks? */
 578                         while (i + nblocks < blocks_left_page &&
 579                                (sector + (nblocks << sector_bits)) ==
 580                                ((sector_t)blocks[block_idx + i + nblocks] <<
 581                                  sector_bits))
 582                                 nblocks++;
 583
 584                         if (bio && can_be_merged(bio, sector) &&
 585                             bio_add_page(bio, page, blocksize * nblocks,
 586                                          page_offset) != 0)
 587                                 continue;       /* added this frag OK */
 588
 589                         if (bio != NULL) {
 590                                 struct request_queue *q = bio_get_queue(bio);
 591                                 unsigned int bi_size = bio_sectors(bio) << 9;
 592
 593                                 /* Dang! I have to fragment this I/O */
 594                                 CDEBUG(D_INODE,
 595                                        "bio++ sz %d vcnt %d(%d) sectors %d(%d) psg %d(%d)\n",
 596                                        bi_size, bio->bi_vcnt, bio->bi_max_vecs,
 597                                        bio_sectors(bio),
 598                                        queue_max_sectors(q),
 599                                        osd_bio_nr_segs(bio),
 600                                        queue_max_segments(q));
 601                                 rc = osd_bio_integrity_handle(osd, bio,
 602                                         iobuf, bio_start_page_idx,
 603                                         fault_inject, integrity_enabled);
 604                                 if (rc) {
 605                                         bio_put(bio);
 606                                         goto out;
 607                                 }
 608
 609                                 record_start_io(iobuf, bi_size);
 610                                 osd_submit_bio(iobuf->dr_rw, bio);
 611                         }
 612
 613                         bio_start_page_idx = page_idx;
 614                         /* allocate new bio */
 615                         bio_private = NULL;
 616                         bio = cfs_bio_alloc(bdev,
 617                                             min_t(unsigned short, BIO_MAX_VECS,
 618                                                   (block_idx_end - block_idx +
 619                                                    blocks_left_page - 1)),
 620                                             iobuf->dr_rw ? REQ_OP_WRITE
 621                                                          : REQ_OP_READ,
 622                                             GFP_NOIO);
 623                         if (!bio) {
 624                                 CERROR("Can't allocate bio %u pages\n",
 625                                        block_idx_end - block_idx +
 626                                        blocks_left_page - 1);
 627                                 rc = -ENOMEM;
 628                                 goto out;
 629                         }
 630                         bio_set_sector(bio, sector);
 631                         rc = osd_bio_init(bio, iobuf, integrity_enabled,
 632                                           bio_start_page_idx, &bio_private);
 633                         if (rc) {
 634                                 bio_put(bio);
 635                                 goto out;
 636                         }
 637
 638                         rc = bio_add_page(bio, page,
 639                                           blocksize * nblocks, page_offset);
 640                         LASSERT(rc != 0);
 641                 }
 642         }
 643
 644         if (bio != NULL) {
 645                 rc = osd_bio_integrity_handle(osd, bio, iobuf,
 646                                               bio_start_page_idx,
 647                                               fault_inject,
 648                                               integrity_enabled);
 649                 if (rc) {
 650                         bio_put(bio);
 651                         goto out;
 652                 }
 653
 654                 record_start_io(iobuf, bio_sectors(bio) << 9);
 655                 osd_submit_bio(iobuf->dr_rw, bio);
 656                 rc = 0;
 657         }
 658
 659 out:
 660         blk_finish_plug(&plug);
 661
 662         /* in order to achieve better IO throughput, we don't wait for writes
 663          * completion here. instead we proceed with transaction commit in
 664          * parallel and wait for IO completion once transaction is stopped
 665          * see osd_trans_stop() for more details -bzzz
 666          */
 667         if (iobuf->dr_rw == 0 || fault_inject) {
 668                 wait_event(iobuf->dr_wait,
 669                            atomic_read(&iobuf->dr_numreqs) == 0);
 670                 osd_fini_iobuf(osd, iobuf);
 671         }
 672
 673         if (rc == 0) {
 674                 rc = iobuf->dr_error;
 675         } else {
 676                 if (bio_private)
 677                         OBD_FREE_PTR(bio_private);
 678         }
 679
 680         /* Write only now */
 681         if (rc == 0 && iobuf->dr_rw)
 682                 osd_mark_page_io_done(iobuf, inode,
 683                                       start_blocks, count);
 684
 685         RETURN(rc);
 686 }
 687
 688 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
 689                                    struct niobuf_local *lnb, int maxlnb)
 690 {
 691         int rc = 0;
 692         ENTRY;
 693
 694         *nrpages = 0;
 695
 696         while (len > 0) {
 697                 int poff = offset & (PAGE_SIZE - 1);
 698                 int plen = PAGE_SIZE - poff;
 699
 700                 if (*nrpages >= maxlnb) {
 701                         rc = -EOVERFLOW;
 702                         break;
 703                 }
 704
 705                 if (plen > len)
 706                         plen = len;
 707                 lnb->lnb_file_offset = offset;
 708                 lnb->lnb_page_offset = poff;
 709                 lnb->lnb_len = plen;
 710                 /* lnb->lnb_flags = rnb->rnb_flags; */
 711                 lnb->lnb_flags = 0;
 712                 lnb->lnb_page = NULL;
 713                 lnb->lnb_rc = 0;
 714                 lnb->lnb_guard_rpc = 0;
 715                 lnb->lnb_guard_disk = 0;
 716                 lnb->lnb_locked = 0;
 717
 718                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
 719                          (long long) len);
 720                 offset += plen;
 721                 len -= plen;
 722                 lnb++;
 723                 (*nrpages)++;
 724         }
 725
 726         RETURN(rc);
 727 }
 728
 729 static struct page *osd_get_page(const struct lu_env *env, struct dt_object *dt,
 730                                  loff_t offset, gfp_t gfp_mask, bool cache)
 731 {
 732         struct osd_thread_info *oti = osd_oti_get(env);
 733         struct inode *inode = osd_dt_obj(dt)->oo_inode;
 734         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
 735         struct page *page;
 736         int cur;
 737
 738         LASSERT(inode);
 739
 740         if (cache) {
 741                 page = find_or_create_page(inode->i_mapping,
 742                                            offset >> PAGE_SHIFT, gfp_mask);
 743
 744                 if (likely(page)) {
 745                         LASSERT(!PagePrivate2(page));
 746                         wait_on_page_writeback(page);
 747                 } else {
 748                         lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
 749                 }
 750
 751                 return page;
 752         }
 753
 754         if (inode->i_mapping->nrpages) {
 755                 /* consult with pagecache, but do not create new pages */
 756                 /* this is normally used once */
 757                 page = find_lock_page(inode->i_mapping, offset >> PAGE_SHIFT);
 758                 if (page) {
 759                         wait_on_page_writeback(page);
 760                         return page;
 761                 }
 762         }
 763
 764         LASSERT(oti->oti_dio_pages);
 765         cur = oti->oti_dio_pages_used;
 766         page = oti->oti_dio_pages[cur];
 767
 768         if (unlikely(!page)) {
 769                 LASSERT(cur < PTLRPC_MAX_BRW_PAGES);
 770                 page = alloc_page(gfp_mask);
 771                 if (!page)
 772                         return NULL;
 773                 oti->oti_dio_pages[cur] = page;
 774                 SetPagePrivate2(page);
 775                 lock_page(page);
 776         }
 777
 778         ClearPageUptodate(page);
 779         page->index = offset >> PAGE_SHIFT;
 780         oti->oti_dio_pages_used++;
 781
 782         return page;
 783 }
 784
 785 /*
 786  * there are following "locks":
 787  * journal_start
 788  * i_mutex
 789  * page lock
 790  *
 791  * osd write path:
 792  *  - lock page(s)
 793  *  - journal_start
 794  *  - truncate_sem
 795  *
 796  * ext4 vmtruncate:
 797  *  - lock pages, unlock
 798  *  - journal_start
 799  *  - lock partial page
 800  *  - i_data_sem
 801  *
 802  */
 803
 804 /**
 805  * Unlock and release pages loaded by osd_bufs_get()
 806  *
 807  * Unlock \a npages pages from \a lnb and drop the refcount on them.
 808  *
 809  * \param env           thread execution environment
 810  * \param dt            dt object undergoing IO (OSD object + methods)
 811  * \param lnb           array of pages undergoing IO
 812  * \param npages        number of pages in \a lnb
 813  *
 814  * \retval 0            always
 815  */
 816 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
 817                         struct niobuf_local *lnb, int npages)
 818 {
 819         struct osd_thread_info *oti = osd_oti_get(env);
 820         struct pagevec pvec;
 821         int i;
 822
 823         ll_pagevec_init(&pvec, 0);
 824
 825         for (i = 0; i < npages; i++) {
 826                 struct page *page = lnb[i].lnb_page;
 827
 828                 if (page == NULL)
 829                         continue;
 830
 831                 /* if the page isn't cached, then reset uptodate
 832                  * to prevent reuse
 833                  */
 834                 if (PagePrivate2(page)) {
 835                         oti->oti_dio_pages_used--;
 836                 } else {
 837                         if (lnb[i].lnb_locked)
 838                                 unlock_page(page);
 839                         if (pagevec_add(&pvec, page) == 0)
 840                                 pagevec_release(&pvec);
 841                 }
 842
 843                 lnb[i].lnb_page = NULL;
 844         }
 845
 846         LASSERTF(oti->oti_dio_pages_used == 0, "%d\n", oti->oti_dio_pages_used);
 847
 848         /* Release any partial pagevec */
 849         pagevec_release(&pvec);
 850
 851         RETURN(0);
 852 }
 853
 854 /**
 855  * Load and lock pages undergoing IO
 856  *
 857  * Pages as described in the \a lnb array are fetched (from disk or cache)
 858  * and locked for IO by the caller.
 859  *
 860  * DLM locking protects us from write and truncate competing for same region,
 861  * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
 862  * It's possible the writeout on a such a page is in progress when we access
 863  * it. It's also possible that during this writeout we put new (partial) data
 864  * into the page, but won't be able to proceed in filter_commitrw_write().
 865  * Therefore, just wait for writeout completion as it should be rare enough.
 866  *
 867  * \param env           thread execution environment
 868  * \param dt            dt object undergoing IO (OSD object + methods)
 869  * \param pos           byte offset of IO start
 870  * \param len           number of bytes of IO
 871  * \param lnb           array of extents undergoing IO
 872  * \param rw            read or write operation, and other flags
 873  * \param capa          capabilities
 874  *
 875  * \retval pages        (zero or more) loaded successfully
 876  * \retval -ENOMEM      on memory/page allocation error
 877  */
 878 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
 879                         loff_t pos, ssize_t len, struct niobuf_local *lnb,
 880                         int maxlnb, enum dt_bufs_type rw)
 881 {
 882         struct osd_thread_info *oti = osd_oti_get(env);
 883         struct osd_object *obj = osd_dt_obj(dt);
 884         struct osd_device *osd   = osd_obj2dev(obj);
 885         int npages, i, iosize, rc = 0;
 886         bool cache, write;
 887         loff_t fsize;
 888         gfp_t gfp_mask;
 889
 890         LASSERT(obj->oo_inode);
 891
 892         if (unlikely(obj->oo_destroyed))
 893                 RETURN(-ENOENT);
 894
 895         rc = osd_map_remote_to_local(pos, len, &npages, lnb, maxlnb);
 896         if (rc)
 897                 RETURN(rc);
 898
 899         write = rw & DT_BUFS_TYPE_WRITE;
 900
 901         fsize = lnb[npages - 1].lnb_file_offset + lnb[npages - 1].lnb_len;
 902         iosize = fsize - lnb[0].lnb_file_offset;
 903         fsize = max(fsize, i_size_read(obj->oo_inode));
 904
 905         cache = rw & DT_BUFS_TYPE_READAHEAD;
 906         if (cache)
 907                 goto bypass_checks;
 908
 909         cache = osd_use_page_cache(osd);
 910         while (cache) {
 911                 if (write) {
 912                         if (!osd->od_writethrough_cache) {
 913                                 cache = false;
 914                                 break;
 915                         }
 916                         if (iosize > osd->od_writethrough_max_iosize) {
 917                                 cache = false;
 918                                 break;
 919                         }
 920                 } else {
 921                         if (!osd->od_read_cache) {
 922                                 cache = false;
 923                                 break;
 924                         }
 925                         if (iosize > osd->od_readcache_max_iosize) {
 926                                 cache = false;
 927                                 break;
 928                         }
 929                 }
 930                 /* don't use cache on large files */
 931                 if (osd->od_readcache_max_filesize &&
 932                     fsize > osd->od_readcache_max_filesize)
 933                         cache = false;
 934                 break;
 935         }
 936
 937 bypass_checks:
 938         if (!cache && unlikely(!oti->oti_dio_pages)) {
 939                 OBD_ALLOC_PTR_ARRAY_LARGE(oti->oti_dio_pages,
 940                                           PTLRPC_MAX_BRW_PAGES);
 941                 if (!oti->oti_dio_pages)
 942                         return -ENOMEM;
 943         }
 944
 945         /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
 946         gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
 947                                              GFP_HIGHUSER;
 948         for (i = 0; i < npages; i++, lnb++) {
 949                 lnb->lnb_page = osd_get_page(env, dt, lnb->lnb_file_offset,
 950                                              gfp_mask, cache);
 951                 if (lnb->lnb_page == NULL)
 952                         GOTO(cleanup, rc = -ENOMEM);
 953
 954                 lnb->lnb_locked = 1;
 955                 if (cache)
 956                         mark_page_accessed(lnb->lnb_page);
 957         }
 958
 959 #if 0
 960         /* XXX: this version doesn't invalidate cached pages, but use them */
 961         if (!cache && write && obj->oo_inode->i_mapping->nrpages) {
 962                 /* do not allow data aliasing, invalidate pagecache */
 963                 /* XXX: can be quite expensive in mixed case */
 964                 invalidate_mapping_pages(obj->oo_inode->i_mapping,
 965                                 lnb[0].lnb_file_offset >> PAGE_SHIFT,
 966                                 lnb[npages - 1].lnb_file_offset >> PAGE_SHIFT);
 967         }
 968 #endif
 969
 970         RETURN(i);
 971
 972 cleanup:
 973         if (i > 0)
 974                 osd_bufs_put(env, dt, lnb - i, i);
 975         return rc;
 976 }
 977 /* Borrow @ext4_chunk_trans_blocks */
 978 static int osd_chunk_trans_blocks(struct inode *inode, int nrblocks)
 979 {
 980         ldiskfs_group_t groups;
 981         int gdpblocks;
 982         int idxblocks;
 983         int depth;
 984         int ret;
 985
 986         depth = ext_depth(inode);
 987         idxblocks = depth * 2;
 988
 989         /*
 990          * Now let's see how many group bitmaps and group descriptors need
 991          * to account.
 992          */
 993         groups = idxblocks + 1;
 994         gdpblocks = groups;
 995         if (groups > LDISKFS_SB(inode->i_sb)->s_groups_count)
 996                 groups = LDISKFS_SB(inode->i_sb)->s_groups_count;
 997         if (gdpblocks > LDISKFS_SB(inode->i_sb)->s_gdb_count)
 998                 gdpblocks = LDISKFS_SB(inode->i_sb)->s_gdb_count;
 999
1000         /* bitmaps and block group descriptor blocks */
1001         ret = idxblocks + groups + gdpblocks;
1002
1003         /* Blocks for super block, inode, quota and xattr blocks */
1004         ret += LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
1005
1006         return ret;
1007 }
1008
1009 #ifdef HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS
1010 static int osd_extend_restart_trans(handle_t *handle, int needed,
1011                                     struct inode *inode)
1012 {
1013         int rc;
1014
1015         rc = ldiskfs_journal_ensure_credits(handle, needed,
1016                 ldiskfs_trans_default_revoke_credits(inode->i_sb));
1017         /* this means journal has been restarted */
1018         if (rc > 0)
1019                 rc = 0;
1020
1021         return rc;
1022 }
1023 #else
1024 static int osd_extend_restart_trans(handle_t *handle, int needed,
1025                                     struct inode *inode)
1026 {
1027         int rc;
1028
1029         if (ldiskfs_handle_has_enough_credits(handle, needed))
1030                 return 0;
1031         rc = ldiskfs_journal_extend(handle,
1032                                 needed - handle->h_buffer_credits);
1033         if (rc <= 0)
1034                 return rc;
1035
1036         return ldiskfs_journal_restart(handle, needed);
1037 }
1038 #endif /* HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS */
1039
1040 static int osd_ldiskfs_map_write(struct inode *inode, struct osd_iobuf *iobuf,
1041                                  struct osd_device *osd, sector_t start_blocks,
1042                                  sector_t count, loff_t *disk_size,
1043                                  __u64 user_size)
1044 {
1045         /* if file has grown, take user_size into account */
1046         if (user_size && *disk_size > user_size)
1047                 *disk_size = user_size;
1048
1049         spin_lock(&inode->i_lock);
1050         if (*disk_size > i_size_read(inode)) {
1051                 i_size_write(inode, *disk_size);
1052                 LDISKFS_I(inode)->i_disksize = *disk_size;
1053                 spin_unlock(&inode->i_lock);
1054                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
1055         } else {
1056                 spin_unlock(&inode->i_lock);
1057         }
1058
1059         /*
1060          * We don't do stats here as in read path because
1061          * write is async: we'll do this in osd_put_bufs()
1062          */
1063         return osd_do_bio(osd, inode, iobuf, start_blocks, count);
1064 }
1065
1066 static unsigned int osd_extent_bytes(const struct osd_device *o)
1067 {
1068         unsigned int *extent_bytes_ptr =
1069                         raw_cpu_ptr(o->od_extent_bytes_percpu);
1070
1071         if (likely(*extent_bytes_ptr))
1072                 return *extent_bytes_ptr;
1073
1074         /* initialize on first access or CPU hotplug */
1075         if (!ldiskfs_has_feature_extents(osd_sb(o)))
1076                 *extent_bytes_ptr = 1 << osd_sb(o)->s_blocksize_bits;
1077         else
1078                 *extent_bytes_ptr = OSD_DEFAULT_EXTENT_BYTES;
1079
1080         return *extent_bytes_ptr;
1081 }
1082
1083 #define EXTENT_BYTES_DECAY 64
1084 static void osd_decay_extent_bytes(struct osd_device *osd,
1085                                    unsigned int new_bytes)
1086 {
1087         unsigned int old_bytes;
1088
1089         if (!ldiskfs_has_feature_extents(osd_sb(osd)))
1090                 return;
1091
1092         old_bytes = osd_extent_bytes(osd);
1093         *raw_cpu_ptr(osd->od_extent_bytes_percpu) =
1094                 (old_bytes * (EXTENT_BYTES_DECAY - 1) +
1095                  min(new_bytes, OSD_DEFAULT_EXTENT_BYTES) +
1096                  EXTENT_BYTES_DECAY - 1) / EXTENT_BYTES_DECAY;
1097 }
1098
1099 static int osd_ldiskfs_map_inode_pages(struct inode *inode,
1100                                        struct osd_iobuf *iobuf,
1101                                        struct osd_device *osd,
1102                                        int create, __u64 user_size,
1103                                        int check_credits,
1104                                        struct thandle *thandle)
1105 {
1106         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
1107         int blocksize = 1 << inode->i_blkbits;
1108         int rc = 0, i = 0, mapped_index = 0;
1109         struct page *fp = NULL;
1110         int clen = 0;
1111         pgoff_t max_page_index;
1112         handle_t *handle = NULL;
1113         sector_t start_blocks = 0, count = 0;
1114         loff_t disk_size = 0;
1115         struct page **page = iobuf->dr_pages;
1116         int pages = iobuf->dr_npages;
1117         sector_t *blocks = iobuf->dr_blocks;
1118         struct niobuf_local *lnb1, *lnb2;
1119         loff_t size1, size2;
1120
1121         max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
1122
1123         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
1124                 inode->i_ino, pages, (*page)->index);
1125
1126         if (create) {
1127                 create = LDISKFS_GET_BLOCKS_CREATE;
1128                 handle = ldiskfs_journal_current_handle();
1129                 LASSERT(handle != NULL);
1130                 rc = osd_attach_jinode(inode);
1131                 if (rc)
1132                         return rc;
1133                 disk_size = i_size_read(inode);
1134                 /* if disk_size is already bigger than specified user_size,
1135                  * ignore user_size
1136                  */
1137                 if (disk_size > user_size)
1138                         user_size = 0;
1139         }
1140         /* pages are sorted already. so, we just have to find
1141          * contig. space and process them properly
1142          */
1143         while (i < pages) {
1144                 long blen, total = 0, previous_total = 0;
1145                 struct ldiskfs_map_blocks map = { 0 };
1146                 ktime_t time;
1147
1148                 if (fp == NULL) { /* start new extent */
1149                         fp = *page++;
1150                         clen = 1;
1151                         if (++i != pages)
1152                                 continue;
1153                 } else if (fp->index + clen == (*page)->index) {
1154                         /* continue the extent */
1155                         page++;
1156                         clen++;
1157                         if (++i != pages)
1158                                 continue;
1159                 }
1160                 if (fp->index + clen >= max_page_index)
1161                         GOTO(cleanup, rc = -EFBIG);
1162                 /* process found extent */
1163                 map.m_lblk = fp->index * blocks_per_page;
1164                 map.m_len = blen = clen * blocks_per_page;
1165
1166                 /*
1167                  * For PAGE_SIZE > blocksize block allocation mapping, the
1168                  * ldiskfs_map_blocks() aims at looking up already mapped
1169                  * blocks, recording them to iobuf->dr_blocks and fixing up
1170                  * m_lblk, m_len for un-allocated blocks to be created/mapped
1171                  * in the second ldiskfs_map_blocks().
1172                  *
1173                  * M_lblk should be the first un-allocated block if m_lblk
1174                  * points at an already allocated block when create = 1,
1175                  * ldiskfs_map_blocks() will just return with already
1176                  * allocated blocks and without allocating any requested
1177                  * new blocks for the extent. For PAGE_SIZE = blocksize
1178                  * case, if m_lblk points at an already allocated block it
1179                  * will point at an un-allocated block in next restart
1180                  * transaction, because the already mapped block/page will
1181                  * be filtered out in next restart transaction via flag
1182                  * OBD_BRW_DONE in osd_declare_write_commit().
1183                  */
1184                 if (create && PAGE_SIZE > blocksize) {
1185                         /* With flags=0 just for already mapped blocks lookup */
1186                         rc = ldiskfs_map_blocks(handle, inode, &map, 0);
1187                         if (rc > 0 && map.m_flags & LDISKFS_MAP_MAPPED) {
1188                                 for (; total < blen && total < map.m_len;
1189                                                 total++)
1190                                         *(blocks + total) = map.m_pblk + total;
1191
1192                                 /* The extent is already full mapped */
1193                                 if (total == blen) {
1194                                         rc = 0;
1195                                         goto ext_already_mapped;
1196                                 }
1197                         }
1198                         /*
1199                          * Fixup or reset m_lblk and m_len for un-mapped blocks.
1200                          * The second ldiskfs_map_blocks() will create and map
1201                          * them.
1202                          */
1203                         map.m_lblk = fp->index * blocks_per_page + total;
1204                         map.m_len = blen - total;
1205                 }
1206
1207 cont_map:
1208                 /**
1209                  * We might restart transaction for block allocations,
1210                  * in order to make sure data ordered mode, issue IO, disk
1211                  * size update and block allocations need be within same
1212                  * transaction to make sure consistency.
1213                  */
1214                 if (handle && check_credits) {
1215                         struct osd_thandle *oh;
1216
1217                         LASSERT(thandle != NULL);
1218                         oh = container_of(thandle, struct osd_thandle,
1219                                           ot_super);
1220                         /*
1221                          * only issue IO if restart transaction needed,
1222                          * as update disk size need hold inode lock, we
1223                          * want to avoid that as much as possible.
1224                          */
1225                         if (oh->oh_declared_ext <= 0) {
1226                                 rc = osd_ldiskfs_map_write(inode,
1227                                         iobuf, osd, start_blocks,
1228                                         count, &disk_size, user_size);
1229                                 if (rc)
1230                                         GOTO(cleanup, rc);
1231                                 thandle->th_restart_tran = 1;
1232                                 GOTO(cleanup, rc = -EAGAIN);
1233                         }
1234
1235                         if (CFS_FAIL_CHECK(OBD_FAIL_OST_RESTART_IO))
1236                                 oh->oh_declared_ext = 0;
1237                         else
1238                                 oh->oh_declared_ext--;
1239                 }
1240
1241                 time = ktime_get();
1242                 rc = ldiskfs_map_blocks(handle, inode, &map, create);
1243                 time = ktime_sub(ktime_get(), time);
1244
1245                 if (rc >= 0) {
1246                         struct brw_stats *h = &osd->od_brw_stats;
1247                         int idx, c = 0;
1248
1249                         idx = map.m_flags & LDISKFS_MAP_NEW ?
1250                                 BRW_ALLOC_TIME : BRW_MAP_TIME;
1251                         lprocfs_oh_tally_log2_pcpu(&h->bs_hist[idx],
1252                                                    ktime_to_ms(time));
1253
1254                         for (; total < blen && c < map.m_len; c++, total++) {
1255                                 if (rc == 0) {
1256                                         *(blocks + total) = 0;
1257                                         total++;
1258                                         break;
1259                                 }
1260                                 if ((map.m_flags & LDISKFS_MAP_UNWRITTEN) &&
1261                                     !create) {
1262                                         /* don't try to read allocated, but
1263                                          * unwritten blocks, instead fill the
1264                                          * patches with zeros in osd_do_bio() */
1265                                         *(blocks + total) = 0;
1266                                         continue;
1267                                 }
1268                                 *(blocks + total) = map.m_pblk + c;
1269                                 /* unmap any possible underlying
1270                                  * metadata from the block device
1271                                  * mapping.  b=6998.
1272                                  */
1273                                 if ((map.m_flags & LDISKFS_MAP_NEW) &&
1274                                     create)
1275                                         clean_bdev_aliases(inode->i_sb->s_bdev,
1276                                                            map.m_pblk + c, 1);
1277                         }
1278                         rc = 0;
1279                 }
1280
1281 ext_already_mapped:
1282                 if (rc == 0 && create) {
1283                         count += (total - previous_total);
1284                         mapped_index = (count + blocks_per_page -
1285                                         1) / blocks_per_page - 1;
1286                         lnb1 = iobuf->dr_lnbs[i - clen];
1287                         lnb2 = iobuf->dr_lnbs[mapped_index];
1288                         size1 = lnb1->lnb_file_offset -
1289                                 (lnb1->lnb_file_offset % PAGE_SIZE) +
1290                                 (total << inode->i_blkbits);
1291                         size2 = lnb2->lnb_file_offset + lnb2->lnb_len;
1292
1293                         if (size1 > size2)
1294                                 size1 = size2;
1295                         if (size1 > disk_size)
1296                                 disk_size = size1;
1297                 }
1298
1299                 if (rc == 0 && total < blen) {
1300                         /*
1301                          * decay extent blocks if we could not
1302                          * allocate extent once.
1303                          */
1304                         osd_decay_extent_bytes(osd,
1305                                 (total - previous_total) << inode->i_blkbits);
1306                         map.m_lblk = fp->index * blocks_per_page + total;
1307                         map.m_len = blen - total;
1308                         previous_total = total;
1309                         goto cont_map;
1310                 }
1311                 if (rc != 0)
1312                         GOTO(cleanup, rc);
1313                 /*
1314                  * decay extent blocks if we could allocate
1315                  * good large extent.
1316                  */
1317                 if (total - previous_total >=
1318                     osd_extent_bytes(osd) >> inode->i_blkbits)
1319                         osd_decay_extent_bytes(osd,
1320                                 (total - previous_total) << inode->i_blkbits);
1321                 /* look for next extent */
1322                 fp = NULL;
1323                 blocks += blocks_per_page * clen;
1324         }
1325 cleanup:
1326         if (rc == 0 && create &&
1327             start_blocks < pages * blocks_per_page) {
1328                 rc = osd_ldiskfs_map_write(inode, iobuf, osd, start_blocks,
1329                                            count, &disk_size, user_size);
1330                 LASSERT(start_blocks + count == pages * blocks_per_page);
1331         }
1332         return rc;
1333 }
1334
1335 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
1336                           struct niobuf_local *lnb, int npages)
1337 {
1338         struct osd_thread_info *oti   = osd_oti_get(env);
1339         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
1340         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
1341         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
1342         ktime_t start, end;
1343         s64 timediff;
1344         ssize_t isize;
1345         __s64  maxidx;
1346         int i, rc = 0;
1347
1348         LASSERT(inode);
1349
1350         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1351         if (unlikely(rc != 0))
1352                 RETURN(rc);
1353
1354         isize = i_size_read(inode);
1355         maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1356
1357         start = ktime_get();
1358         for (i = 0; i < npages; i++) {
1359
1360                 /*
1361                  * till commit the content of the page is undefined
1362                  * we'll set it uptodate once bulk is done. otherwise
1363                  * subsequent reads can access non-stable data
1364                  */
1365                 ClearPageUptodate(lnb[i].lnb_page);
1366
1367                 if (lnb[i].lnb_len == PAGE_SIZE)
1368                         continue;
1369
1370                 if (maxidx >= lnb[i].lnb_page->index) {
1371                         osd_iobuf_add_page(iobuf, &lnb[i]);
1372                 } else {
1373                         long off;
1374                         char *p = kmap(lnb[i].lnb_page);
1375
1376                         off = lnb[i].lnb_page_offset;
1377                         if (off)
1378                                 memset(p, 0, off);
1379                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1380                               ~PAGE_MASK;
1381                         if (off)
1382                                 memset(p + off, 0, PAGE_SIZE - off);
1383                         kunmap(lnb[i].lnb_page);
1384                 }
1385         }
1386         end = ktime_get();
1387         timediff = ktime_us_delta(end, start);
1388         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1389
1390         if (iobuf->dr_npages) {
1391                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1392                                                  0, 0, NULL);
1393                 if (likely(rc == 0)) {
1394                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1395                         /* do IO stats for preparation reads */
1396                         osd_fini_iobuf(osd, iobuf);
1397                 }
1398         }
1399         RETURN(rc);
1400 }
1401
1402 struct osd_fextent {
1403         sector_t        start;
1404         sector_t        end;
1405         __u32           flags;
1406         unsigned int    mapped:1;
1407 };
1408
1409 #ifdef KERNEL_DS
1410 #define DECLARE_MM_SEGMENT_T(name)              mm_segment_t name
1411 #define access_set_kernel(saved_fs, fei)                                \
1412 do {                                                                    \
1413         saved_fs = get_fs();                                            \
1414         set_fs(KERNEL_DS);                                              \
1415 } while (0)
1416 #define access_unset_kernel(saved_fs, fei)              set_fs((saved_fs))
1417 #else
1418 #define DECLARE_MM_SEGMENT_T(name)
1419 #define access_set_kernel(saved_fs, fei)                                \
1420         (fei)->fi_flags |= LDISKFS_FIEMAP_FLAG_MEMCPY
1421 #define access_unset_kernel(saved_fs, fei) \
1422         (fei)->fi_flags &= ~(LDISKFS_FIEMAP_FLAG_MEMCPY)
1423 #endif /* KERNEL_DS */
1424
1425 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1426                          struct osd_fextent *cached_extent)
1427 {
1428         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1429         sector_t block = offset >> inode->i_blkbits;
1430         sector_t start;
1431         struct fiemap_extent_info fei = { 0 };
1432         struct fiemap_extent fe = { 0 };
1433         int rc;
1434         DECLARE_MM_SEGMENT_T(saved_fs);
1435
1436         if (block >= cached_extent->start && block < cached_extent->end)
1437                 return cached_extent->mapped;
1438
1439         if (i_size_read(inode) == 0)
1440                 return 0;
1441
1442         /* Beyond EOF, must not be mapped */
1443         if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1444                 return 0;
1445
1446         fei.fi_extents_max = 1;
1447         fei.fi_extents_start = &fe;
1448         access_set_kernel(saved_fs, &fei);
1449         rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1450         access_unset_kernel(saved_fs, &fei);
1451         if (rc != 0)
1452                 return 0;
1453
1454         start = fe.fe_logical >> inode->i_blkbits;
1455         cached_extent->flags = fe.fe_flags;
1456         if (fei.fi_extents_mapped == 0) {
1457                 /* a special case - no extent found at this offset and forward.
1458                  * we can consider this as a hole to EOF. it's safe to cache
1459                  * as other threads can not allocate/punch blocks this thread
1460                  * is working on (LDLM). */
1461                 cached_extent->start = block;
1462                 cached_extent->end = i_size_read(inode) >> inode->i_blkbits;
1463                 cached_extent->mapped = 0;
1464                 return 0;
1465         }
1466
1467         if (start > block) {
1468                 cached_extent->start = block;
1469                 cached_extent->end = start;
1470                 cached_extent->mapped = 0;
1471         } else {
1472                 cached_extent->start = start;
1473                 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1474                                       inode->i_blkbits;
1475                 cached_extent->mapped = 1;
1476         }
1477
1478         return cached_extent->mapped;
1479 }
1480
1481 #define MAX_EXTENTS_PER_WRITE 100
1482 static int osd_declare_write_commit(const struct lu_env *env,
1483                                     struct dt_object *dt,
1484                                     struct niobuf_local *lnb, int npages,
1485                                     struct thandle *handle)
1486 {
1487         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1488         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1489         struct osd_thandle      *oh;
1490         int                     extents = 0, new_meta = 0;
1491         int                     depth, new_blocks = 0;
1492         int                     i;
1493         int                     dirty_groups = 0;
1494         int                     rc = 0;
1495         int                     credits = 0;
1496         long long               quota_space = 0;
1497         struct osd_fextent      mapped = { 0 }, extent = { 0 };
1498         enum osd_quota_local_flags local_flags = 0;
1499         enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1500         unsigned int            extent_bytes;
1501         ENTRY;
1502
1503         LASSERT(handle != NULL);
1504         oh = container_of(handle, struct osd_thandle, ot_super);
1505         LASSERT(oh->ot_handle == NULL);
1506
1507         /*
1508          * We track a decaying average extent blocks per filesystem,
1509          * for most of time, it will be 1M, with filesystem becoming
1510          * heavily-fragmented, it will be reduced to 4K at the worst.
1511          */
1512         extent_bytes = osd_extent_bytes(osd);
1513         LASSERT(extent_bytes >= osd_sb(osd)->s_blocksize);
1514
1515         /* calculate number of extents (probably better to pass nb) */
1516         for (i = 0; i < npages; i++) {
1517                 /* ignore quota for the whole request if any page is from
1518                  * client cache or written by root.
1519                  *
1520                  * XXX we could handle this on per-lnb basis as done by
1521                  * grant.
1522                  */
1523                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1524                     (lnb[i].lnb_flags & OBD_BRW_SYS_RESOURCE) ||
1525                     !(lnb[i].lnb_flags & OBD_BRW_SYNC))
1526                         declare_flags |= OSD_QID_FORCE;
1527
1528                 /*
1529                  * Convert unwritten extent might need split extents, could
1530                  * not skip it.
1531                  */
1532                 if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &mapped) &&
1533                     !(mapped.flags & FIEMAP_EXTENT_UNWRITTEN)) {
1534                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1535                         continue;
1536                 }
1537
1538                 if (lnb[i].lnb_flags & OBD_BRW_DONE) {
1539                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1540                         continue;
1541                 }
1542
1543                 /* count only unmapped changes */
1544                 new_blocks++;
1545                 if (lnb[i].lnb_file_offset != extent.end || extent.end == 0) {
1546                         if (extent.end != 0)
1547                                 extents += (extent.end - extent.start +
1548                                             extent_bytes - 1) / extent_bytes;
1549                         extent.start = lnb[i].lnb_file_offset;
1550                         extent.end = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1551                 } else {
1552                         extent.end += lnb[i].lnb_len;
1553                 }
1554
1555                 quota_space += PAGE_SIZE;
1556         }
1557
1558         credits++; /* inode */
1559         /*
1560          * overwrite case, no need to modify tree and
1561          * allocate blocks.
1562          */
1563         if (!extent.end)
1564                 goto out_declare;
1565
1566         extents += (extent.end - extent.start +
1567                     extent_bytes - 1) / extent_bytes;
1568         /**
1569          * with system space usage growing up, mballoc codes won't
1570          * try best to scan block group to align best free extent as
1571          * we can. So extent bytes per extent could be decayed to a
1572          * very small value, this could make us reserve too many credits.
1573          * We could be more optimistic in the credit reservations, even
1574          * in a case where the filesystem is nearly full, it is extremely
1575          * unlikely that the worst case would ever be hit.
1576          */
1577         if (extents > MAX_EXTENTS_PER_WRITE)
1578                 extents = MAX_EXTENTS_PER_WRITE;
1579
1580         /**
1581          * If we add a single extent, then in the worse case, each tree
1582          * level index/leaf need to be changed in case of the tree split.
1583          * If more extents are inserted, they could cause the whole tree
1584          * split more than once, but this is really rare.
1585          */
1586         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1587                 /*
1588                  * many concurrent threads may grow tree by the time
1589                  * our transaction starts. so, consider 2 is a min depth.
1590                  */
1591                 depth = ext_depth(inode);
1592                 depth = min(max(depth, 1) + 1, LDISKFS_MAX_EXTENT_DEPTH);
1593                 if (extents <= 1) {
1594                         credits += depth * 2 * extents;
1595                         new_meta = depth;
1596                 } else {
1597                         credits += depth * 3 * extents;
1598                         new_meta = depth * 2 * extents;
1599                 }
1600         } else {
1601                 /*
1602                  * With N contiguous data blocks, we need at most
1603                  * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks,
1604                  * 2 dindirect blocks, and 1 tindirect block
1605                  */
1606                 new_meta = DIV_ROUND_UP(new_blocks,
1607                                 LDISKFS_ADDR_PER_BLOCK(inode->i_sb)) + 4;
1608                 credits += new_meta;
1609         }
1610         dirty_groups += (extents + new_meta);
1611
1612         oh->oh_declared_ext = extents;
1613
1614         /* quota space for metadata blocks */
1615         quota_space += new_meta * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1616
1617         /* quota space should be reported in 1K blocks */
1618         quota_space = toqb(quota_space);
1619
1620         /* each new block can go in different group (bitmap + gd) */
1621
1622         /* we can't dirty more bitmap blocks than exist */
1623         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1624                 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1625         else
1626                 credits += dirty_groups;
1627
1628         /* we can't dirty more gd blocks than exist */
1629         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1630                 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1631         else
1632                 credits += dirty_groups;
1633
1634         CDEBUG(D_INODE,
1635                "%s: inode #%lu extent_bytes %u extents %d credits %d\n",
1636                osd_ino2name(inode), inode->i_ino, extent_bytes, extents,
1637                credits);
1638
1639 out_declare:
1640         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1641
1642         /* make sure the over quota flags were not set */
1643         lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1644
1645         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1646                                    i_projid_read(inode), quota_space, oh,
1647                                    osd_dt_obj(dt), &local_flags, declare_flags);
1648
1649         /* we need only to store the overquota flags in the first lnb for
1650          * now, once we support multiple objects BRW, this code needs be
1651          * revised.
1652          */
1653         if (local_flags & QUOTA_FL_OVER_USRQUOTA)
1654                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1655         if (local_flags & QUOTA_FL_OVER_GRPQUOTA)
1656                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1657         if (local_flags & QUOTA_FL_OVER_PRJQUOTA)
1658                 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1659         if (local_flags & QUOTA_FL_ROOT_PRJQUOTA)
1660                 lnb[0].lnb_flags |= OBD_BRW_ROOT_PRJQUOTA;
1661
1662         if (rc == 0)
1663                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, true);
1664
1665         RETURN(rc);
1666 }
1667
1668 /* Check if a block is allocated or not */
1669 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1670                             struct niobuf_local *lnb, int npages,
1671                             struct thandle *thandle, __u64 user_size)
1672 {
1673         struct osd_thread_info *oti = osd_oti_get(env);
1674         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1675         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1676         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1677         int rc = 0, i, check_credits = 0;
1678
1679         LASSERT(inode);
1680
1681         rc = osd_init_iobuf(osd, iobuf, 1, npages);
1682         if (unlikely(rc != 0))
1683                 RETURN(rc);
1684
1685         dquot_initialize(inode);
1686
1687         for (i = 0; i < npages; i++) {
1688                 if (lnb[i].lnb_rc == -ENOSPC &&
1689                     (lnb[i].lnb_flags & OBD_BRW_MAPPED)) {
1690                         /* Allow the write to proceed if overwriting an
1691                          * existing block
1692                          */
1693                         lnb[i].lnb_rc = 0;
1694                 }
1695
1696                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1697                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1698                                lnb[i].lnb_rc);
1699                         LASSERT(lnb[i].lnb_page);
1700                         generic_error_remove_page(inode->i_mapping,
1701                                                   lnb[i].lnb_page);
1702                         continue;
1703                 }
1704
1705                 if (lnb[i].lnb_flags & OBD_BRW_DONE)
1706                         continue;
1707
1708                 if (!(lnb[i].lnb_flags & OBD_BRW_MAPPED))
1709                         check_credits = 1;
1710
1711                 LASSERT(PageLocked(lnb[i].lnb_page));
1712                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1713
1714                 /*
1715                  * Since write and truncate are serialized by oo_sem, even
1716                  * partial-page truncate should not leave dirty pages in the
1717                  * page cache.
1718                  */
1719                 LASSERT(!PageDirty(lnb[i].lnb_page));
1720
1721                 SetPageUptodate(lnb[i].lnb_page);
1722
1723                 osd_iobuf_add_page(iobuf, &lnb[i]);
1724         }
1725
1726         osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1727
1728         if (CFS_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1729                 rc = -ENOSPC;
1730         } else if (iobuf->dr_npages > 0) {
1731                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd,
1732                                                  1, user_size,
1733                                                  check_credits,
1734                                                  thandle);
1735         } else {
1736                 /* no pages to write, no transno is needed */
1737                 thandle->th_local = 1;
1738         }
1739
1740         if (rc != 0 && !thandle->th_restart_tran)
1741                 osd_fini_iobuf(osd, iobuf);
1742
1743         osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1744
1745         if (unlikely(rc != 0 && !thandle->th_restart_tran)) {
1746                 /* if write fails, we should drop pages from the cache */
1747                 for (i = 0; i < npages; i++) {
1748                         if (lnb[i].lnb_page == NULL)
1749                                 continue;
1750                         if (!PagePrivate2(lnb[i].lnb_page)) {
1751                                 LASSERT(PageLocked(lnb[i].lnb_page));
1752                                 generic_error_remove_page(inode->i_mapping,
1753                                                           lnb[i].lnb_page);
1754                         }
1755                 }
1756         }
1757
1758         RETURN(rc);
1759 }
1760
1761 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1762                          struct niobuf_local *lnb, int npages)
1763 {
1764         struct osd_thread_info *oti = osd_oti_get(env);
1765         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1766         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1767         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1768         int rc = 0, i, cache_hits = 0, cache_misses = 0;
1769         ktime_t start, end;
1770         s64 timediff;
1771         loff_t isize;
1772
1773         LASSERT(inode);
1774
1775         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1776         if (unlikely(rc != 0))
1777                 RETURN(rc);
1778
1779         isize = i_size_read(inode);
1780
1781         start = ktime_get();
1782         for (i = 0; i < npages; i++) {
1783
1784                 if (isize <= lnb[i].lnb_file_offset)
1785                         /* If there's no more data, abort early.
1786                          * lnb->lnb_rc == 0, so it's easy to detect later.
1787                          */
1788                         break;
1789
1790                 /* instead of looking if we go beyong isize, send complete
1791                  * pages all the time
1792                  */
1793                 lnb[i].lnb_rc = lnb[i].lnb_len;
1794
1795                 /* Bypass disk read if fail_loc is set properly */
1796                 if (CFS_FAIL_CHECK_QUIET(OBD_FAIL_OST_FAKE_RW))
1797                         SetPageUptodate(lnb[i].lnb_page);
1798
1799                 if (PageUptodate(lnb[i].lnb_page)) {
1800                         cache_hits++;
1801                         unlock_page(lnb[i].lnb_page);
1802                 } else {
1803                         cache_misses++;
1804                         osd_iobuf_add_page(iobuf, &lnb[i]);
1805                 }
1806                 /* no need to unlock in osd_bufs_put(), the sooner page is
1807                  * unlocked, the earlier another client can access it.
1808                  * notice real unlock_page() can be called few lines
1809                  * below after osd_do_bio(). lnb is a per-thread, so it's
1810                  * fine to have PG_locked and lnb_locked inconsistent here
1811                  */
1812                 lnb[i].lnb_locked = 0;
1813         }
1814         end = ktime_get();
1815         timediff = ktime_us_delta(end, start);
1816         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1817
1818         if (cache_hits != 0)
1819                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1820                                     cache_hits);
1821         if (cache_misses != 0)
1822                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1823                                     cache_misses);
1824         if (cache_hits + cache_misses != 0)
1825                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1826                                     cache_hits + cache_misses);
1827
1828         if (iobuf->dr_npages) {
1829                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1830                                                  0, 0, NULL);
1831                 if (!rc)
1832                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1833
1834                 /* IO stats will be done in osd_bufs_put() */
1835
1836                 /* early release to let others read data during the bulk */
1837                 for (i = 0; i < iobuf->dr_npages; i++) {
1838                         LASSERT(PageLocked(iobuf->dr_pages[i]));
1839                         if (!PagePrivate2(iobuf->dr_pages[i]))
1840                                 unlock_page(iobuf->dr_pages[i]);
1841                 }
1842         }
1843
1844         RETURN(rc);
1845 }
1846
1847 /*
1848  * XXX: Another layering violation for now.
1849  *
1850  * We don't want to use ->f_op->read methods, because generic file write
1851  *
1852  *         - serializes on ->i_sem, and
1853  *
1854  *         - does a lot of extra work like balance_dirty_pages(),
1855  *
1856  * which doesn't work for globally shared files like /last_rcvd.
1857  */
1858 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1859 {
1860         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1861
1862         memcpy(buffer, (char *)ei->i_data, buflen);
1863
1864         return  buflen;
1865 }
1866
1867 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1868 {
1869         struct buffer_head *bh;
1870         unsigned long block;
1871         int osize;
1872         int blocksize;
1873         int csize;
1874         int boffs;
1875
1876         /* prevent reading after eof */
1877         spin_lock(&inode->i_lock);
1878         if (i_size_read(inode) < *offs + size) {
1879                 loff_t diff = i_size_read(inode) - *offs;
1880
1881                 spin_unlock(&inode->i_lock);
1882                 if (diff < 0) {
1883                         CDEBUG(D_OTHER,
1884                                "size %llu is too short to read @%llu\n",
1885                                i_size_read(inode), *offs);
1886                         return -EBADR;
1887                 } else if (diff == 0) {
1888                         return 0;
1889                 } else {
1890                         size = diff;
1891                 }
1892         } else {
1893                 spin_unlock(&inode->i_lock);
1894         }
1895
1896         blocksize = 1 << inode->i_blkbits;
1897         osize = size;
1898         while (size > 0) {
1899                 block = *offs >> inode->i_blkbits;
1900                 boffs = *offs & (blocksize - 1);
1901                 csize = min(blocksize - boffs, size);
1902                 bh = __ldiskfs_bread(NULL, inode, block, 0);
1903                 if (IS_ERR(bh)) {
1904                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1905                                osd_ino2name(inode), csize, *offs, inode->i_ino,
1906                                PTR_ERR(bh));
1907                         return PTR_ERR(bh);
1908                 }
1909
1910                 if (bh != NULL) {
1911                         memcpy(buf, bh->b_data + boffs, csize);
1912                         brelse(bh);
1913                 } else {
1914                         memset(buf, 0, csize);
1915                 }
1916
1917                 *offs += csize;
1918                 buf += csize;
1919                 size -= csize;
1920         }
1921         return osize;
1922 }
1923
1924 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1925                         struct lu_buf *buf, loff_t *pos)
1926 {
1927         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1928         int rc;
1929
1930         /* Read small symlink from inode body as we need to maintain correct
1931          * on-disk symlinks for ldiskfs.
1932          */
1933         if (S_ISLNK(dt->do_lu.lo_header->loh_attr)) {
1934                 loff_t size = i_size_read(inode);
1935
1936                 if (buf->lb_len < size)
1937                         return -EOVERFLOW;
1938
1939                 if (size < sizeof(LDISKFS_I(inode)->i_data))
1940                         rc = osd_ldiskfs_readlink(inode, buf->lb_buf, size);
1941                 else
1942                         rc = osd_ldiskfs_read(inode, buf->lb_buf, size, pos);
1943         } else {
1944                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1945         }
1946
1947         return rc;
1948 }
1949
1950 static inline int osd_extents_enabled(struct super_block *sb,
1951                                       struct inode *inode)
1952 {
1953         if (inode != NULL) {
1954                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1955                         return 1;
1956         } else if (ldiskfs_has_feature_extents(sb)) {
1957                 return 1;
1958         }
1959         return 0;
1960 }
1961
1962 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1963                            const loff_t size, const loff_t pos,
1964                            const int blocks)
1965 {
1966         int credits, bits, bs, i;
1967
1968         bits = sb->s_blocksize_bits;
1969         bs = 1 << bits;
1970
1971         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1972          * we do not expect blockmaps on the large files,
1973          * so let's shrink it to 2 levels (4GB files)
1974          */
1975
1976         /* this is default reservation: 2 levels */
1977         credits = (blocks + 2) * 3;
1978
1979         /* actual offset is unknown, hard to optimize */
1980         if (pos == -1)
1981                 return credits;
1982
1983         /* now check for few specific cases to optimize */
1984         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1985                 /* no indirects */
1986                 credits = blocks;
1987                 /* allocate if not allocated */
1988                 if (inode == NULL) {
1989                         credits += blocks * 2;
1990                         return credits;
1991                 }
1992                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1993                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1994                         if (LDISKFS_I(inode)->i_data[i] == 0)
1995                                 credits += 2;
1996                 }
1997         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1998                 /* single indirect */
1999                 credits = blocks * 3;
2000                 if (inode == NULL ||
2001                     LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
2002                         credits += 3;
2003                 else
2004                         /* The indirect block may be modified. */
2005                         credits += 1;
2006         }
2007
2008         return credits;
2009 }
2010
2011 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
2012                                  const struct lu_buf *buf, loff_t _pos,
2013                                  struct thandle *handle)
2014 {
2015         struct osd_object  *obj  = osd_dt_obj(dt);
2016         struct inode       *inode = obj->oo_inode;
2017         struct super_block *sb = osd_sb(osd_obj2dev(obj));
2018         struct osd_thandle *oh;
2019         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
2020         int                 bits, bs;
2021         int                 depth, size;
2022         loff_t              pos;
2023         ENTRY;
2024
2025         LASSERT(buf != NULL);
2026         LASSERT(handle != NULL);
2027
2028         oh = container_of(handle, struct osd_thandle, ot_super);
2029         LASSERT(oh->ot_handle == NULL);
2030
2031         size = buf->lb_len;
2032         bits = sb->s_blocksize_bits;
2033         bs = 1 << bits;
2034
2035         if (osd_tx_was_declared(env, oh, dt, DTO_WRITE_BASE, _pos))
2036                 RETURN(0);
2037
2038         if (_pos == -1) {
2039                 /* if this is an append, then we
2040                  * should expect cross-block record
2041                  */
2042                 pos = 0;
2043         } else {
2044                 pos = _pos;
2045         }
2046
2047         /* blocks to modify */
2048         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
2049         LASSERT(blocks > 0);
2050
2051         if (inode != NULL && _pos != -1) {
2052                 /* object size in blocks */
2053                 est = (i_size_read(inode) + bs - 1) >> bits;
2054                 allocated = inode->i_blocks >> (bits - 9);
2055                 if (pos + size <= i_size_read(inode) && est <= allocated) {
2056                         /* looks like an overwrite, no need to modify tree */
2057                         credits = blocks;
2058                         /* no need to modify i_size */
2059                         goto out;
2060                 }
2061         }
2062
2063         if (osd_extents_enabled(sb, inode)) {
2064                 /*
2065                  * many concurrent threads may grow tree by the time
2066                  * our transaction starts. so, consider 2 is a min depth
2067                  * for every level we may need to allocate a new block
2068                  * and take some entries from the old one. so, 3 blocks
2069                  * to allocate (bitmap, gd, itself) + old block - 4 per
2070                  * level.
2071                  */
2072                 depth = inode != NULL ? ext_depth(inode) : 0;
2073                 depth = min(max(depth, 1) + 3, LDISKFS_MAX_EXTENT_DEPTH);
2074                 credits = depth;
2075                 /* if not append, then split may need to modify
2076                  * existing blocks moving entries into the new ones
2077                  */
2078                 if (_pos != -1)
2079                         credits += depth;
2080                 /* blocks to store data: bitmap,gd,itself */
2081                 credits += blocks * 3;
2082         } else {
2083                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
2084         }
2085         /* if inode is created as part of the transaction,
2086          * then it's counted already by the creation method
2087          */
2088         if (inode != NULL)
2089                 credits++;
2090
2091 out:
2092
2093         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
2094
2095         /* dt_declare_write() is usually called for system objects, such
2096          * as llog or last_rcvd files. We needn't enforce quota on those
2097          * objects, so always set the lqi_space as 0.
2098          */
2099         if (inode != NULL)
2100                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
2101                                            i_gid_read(inode),
2102                                            i_projid_read(inode), 0,
2103                                            oh, obj, NULL, OSD_QID_BLK);
2104
2105         if (rc == 0)
2106                 rc = osd_trunc_lock(obj, oh, true);
2107
2108         RETURN(rc);
2109 }
2110
2111 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
2112 {
2113         /* LU-2634: clear the extent format for fast symlink */
2114         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
2115
2116         /* Copying the NUL byte terminating the link target as well */
2117         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen + 1);
2118         spin_lock(&inode->i_lock);
2119         LDISKFS_I(inode)->i_disksize = buflen;
2120         i_size_write(inode, buflen);
2121         spin_unlock(&inode->i_lock);
2122         osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2123
2124         return 0;
2125 }
2126
2127 static int osd_ldiskfs_write_record(struct dt_object *dt, void *buf,
2128                                     int bufsize, int write_NUL, loff_t *offs,
2129                                     handle_t *handle)
2130 {
2131         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2132         struct buffer_head *bh        = NULL;
2133         loff_t              offset    = *offs;
2134         loff_t              new_size  = i_size_read(inode);
2135         unsigned long       block;
2136         int                 blocksize = 1 << inode->i_blkbits;
2137         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2138         int                 err = 0;
2139         int                 size;
2140         int                 boffs;
2141         int                 dirty_inode = 0;
2142         bool create, sparse, sync = false;
2143
2144         if (write_NUL) {
2145                 /*
2146                  * long symlink write does not count the NUL terminator in
2147                  * bufsize, we write it, and the inode's file size does not
2148                  * count the NUL terminator as well.
2149                  */
2150                 ((char *)buf)[bufsize] = '\0';
2151                 ++bufsize;
2152         }
2153
2154         /* only the first flag-set matters */
2155         dirty_inode = !test_and_set_bit(LDISKFS_INODE_JOURNAL_DATA,
2156                                        &ei->i_flags);
2157
2158         /* sparse checking is racy, but sparse is very rare case, leave as is */
2159         sparse = (new_size > 0 && (inode->i_blocks >> (inode->i_blkbits - 9)) <
2160                   ((new_size - 1) >> inode->i_blkbits) + 1);
2161
2162         while (bufsize > 0) {
2163                 int credits = handle->h_buffer_credits;
2164                 unsigned long last_block = (new_size == 0) ? 0 :
2165                                            (new_size - 1) >> inode->i_blkbits;
2166
2167                 if (bh)
2168                         brelse(bh);
2169
2170                 block = offset >> inode->i_blkbits;
2171                 boffs = offset & (blocksize - 1);
2172                 size = min(blocksize - boffs, bufsize);
2173                 sync = (block > last_block || new_size == 0 || sparse);
2174
2175                 if (sync)
2176                         down(&ei->i_append_sem);
2177
2178                 bh = __ldiskfs_bread(handle, inode, block, 0);
2179
2180                 if (unlikely(IS_ERR_OR_NULL(bh) && !sync))
2181                         CWARN(
2182                               "%s: adding bh without locking off %llu (block %lu, size %d, offs %llu)\n",
2183                               osd_ino2name(inode),
2184                               offset, block, bufsize, *offs);
2185
2186                 if (IS_ERR_OR_NULL(bh)) {
2187                         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2188                         int flags = LDISKFS_GET_BLOCKS_CREATE;
2189
2190                         /* while the file system is being mounted, avoid
2191                          * preallocation otherwise mount can take a long
2192                          * time as mballoc cache is cold.
2193                          * XXX: this is a workaround until we have a proper
2194                          *      fix in mballoc
2195                          * XXX: works with extent-based files only */
2196                         if (!osd->od_cl_seq)
2197                                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2198                         bh = __ldiskfs_bread(handle, inode, block, flags);
2199                         create = true;
2200                 } else {
2201                         if (sync) {
2202                                 up(&ei->i_append_sem);
2203                                 sync = false;
2204                         }
2205                         create = false;
2206                 }
2207                 if (IS_ERR_OR_NULL(bh)) {
2208                         if (bh == NULL) {
2209                                 err = -EIO;
2210                         } else {
2211                                 err = PTR_ERR(bh);
2212                                 bh = NULL;
2213                         }
2214
2215                         CERROR(
2216                                "%s: error reading offset %llu (block %lu, size %d, offs %llu), credits %d/%d: rc = %d\n",
2217                                osd_ino2name(inode), offset, block, bufsize,
2218                                *offs, credits, handle->h_buffer_credits, err);
2219                         break;
2220                 }
2221
2222                 err = osd_ldiskfs_journal_get_write_access(handle, inode->i_sb,
2223                                                            bh,
2224                                                            LDISKFS_JTR_NONE);
2225                 if (err) {
2226                         CERROR("journal_get_write_access() returned error %d\n",
2227                                err);
2228                         break;
2229                 }
2230                 LASSERTF(boffs + size <= bh->b_size,
2231                          "boffs %d size %d bh->b_size %lu\n",
2232                          boffs, size, (unsigned long)bh->b_size);
2233                 if (create) {
2234                         memset(bh->b_data, 0, bh->b_size);
2235                         if (sync) {
2236                                 up(&ei->i_append_sem);
2237                                 sync = false;
2238                         }
2239                 }
2240                 memcpy(bh->b_data + boffs, buf, size);
2241                 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
2242                 if (err)
2243                         break;
2244
2245                 if (offset + size > new_size)
2246                         new_size = offset + size;
2247                 offset += size;
2248                 bufsize -= size;
2249                 buf += size;
2250         }
2251         if (sync)
2252                 up(&ei->i_append_sem);
2253
2254         if (bh)
2255                 brelse(bh);
2256
2257         if (write_NUL)
2258                 --new_size;
2259         /* correct in-core and on-disk sizes */
2260         if (new_size > i_size_read(inode)) {
2261                 spin_lock(&inode->i_lock);
2262                 if (new_size > i_size_read(inode))
2263                         i_size_write(inode, new_size);
2264                 if (i_size_read(inode) > ei->i_disksize) {
2265                         ei->i_disksize = i_size_read(inode);
2266                         dirty_inode = 1;
2267                 }
2268                 spin_unlock(&inode->i_lock);
2269         }
2270         if (dirty_inode)
2271                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2272
2273         if (err == 0)
2274                 *offs = offset;
2275         return err;
2276 }
2277
2278 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
2279                          const struct lu_buf *buf, loff_t *pos,
2280                          struct thandle *handle)
2281 {
2282         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
2283         struct osd_thandle      *oh;
2284         ssize_t                 result;
2285         int                     is_link;
2286
2287         LASSERT(dt_object_exists(dt));
2288
2289         LASSERT(handle != NULL);
2290         LASSERT(inode != NULL);
2291         dquot_initialize(inode);
2292
2293         /* XXX: don't check: one declared chunk can be used many times */
2294         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
2295
2296         oh = container_of(handle, struct osd_thandle, ot_super);
2297         LASSERT(oh->ot_handle->h_transaction != NULL);
2298         osd_trans_exec_op(env, handle, OSD_OT_WRITE);
2299
2300         /* Write small symlink to inode body as we need to maintain correct
2301          * on-disk symlinks for ldiskfs.
2302          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
2303          * does not count it in.
2304          */
2305         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
2306         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
2307                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
2308         else
2309                 result = osd_ldiskfs_write_record(dt, buf->lb_buf, buf->lb_len,
2310                                                   is_link, pos, oh->ot_handle);
2311         if (result == 0)
2312                 result = buf->lb_len;
2313
2314         osd_trans_exec_check(env, handle, OSD_OT_WRITE);
2315
2316         return result;
2317 }
2318
2319 static int osd_declare_fallocate(const struct lu_env *env,
2320                                  struct dt_object *dt, __u64 start, __u64 end,
2321                                  int mode, struct thandle *th)
2322 {
2323         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2324         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2325         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2326         long long quota_space = 0;
2327         /* 5 is max tree depth. (inode + 4 index blocks) */
2328         int depth = 5;
2329         int rc;
2330
2331         ENTRY;
2332
2333         /*
2334          * mode == 0 (which is standard prealloc) and PUNCH is supported
2335          * Rest of mode options is not supported yet.
2336          */
2337         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2338                 RETURN(-EOPNOTSUPP);
2339
2340         /* disable fallocate completely */
2341         if (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks < 0)
2342                 RETURN(-EOPNOTSUPP);
2343
2344         LASSERT(th);
2345         LASSERT(inode);
2346
2347         if (mode & FALLOC_FL_PUNCH_HOLE) {
2348                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
2349                                            i_gid_read(inode),
2350                                            i_projid_read(inode), 0, oh,
2351                                            osd_dt_obj(dt), NULL, OSD_QID_BLK);
2352                 if (rc == 0)
2353                         rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
2354                 RETURN(rc);
2355         }
2356
2357         /* quota space for metadata blocks
2358          * approximate metadata estimate should be good enough.
2359          */
2360         quota_space += PAGE_SIZE;
2361         quota_space += depth * LDISKFS_BLOCK_SIZE(osd_sb(osd));
2362
2363         /* quota space should be reported in 1K blocks */
2364         quota_space = toqb(quota_space) + toqb(end - start) +
2365                       LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
2366
2367         /* We don't need to reserve credits for whole fallocate here.
2368          * We reserve space only for metadata. Fallocate credits are
2369          * extended as required
2370          */
2371         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2372                                    i_projid_read(inode), quota_space, oh,
2373                                    osd_dt_obj(dt), NULL, OSD_QID_BLK);
2374         RETURN(rc);
2375 }
2376
2377 static int osd_fallocate_preallocate(const struct lu_env *env,
2378                                      struct dt_object *dt,
2379                                      __u64 start, __u64 end, int mode,
2380                                      struct thandle *th)
2381 {
2382         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2383         handle_t *handle = ldiskfs_journal_current_handle();
2384         unsigned int save_credits = oh->ot_credits;
2385         struct osd_object *obj = osd_dt_obj(dt);
2386         struct inode *inode = obj->oo_inode;
2387         struct ldiskfs_map_blocks map;
2388         unsigned int credits;
2389         ldiskfs_lblk_t blen;
2390         ldiskfs_lblk_t boff;
2391         loff_t new_size = 0;
2392         int depth = 0;
2393         int flags;
2394         int rc = 0;
2395
2396         ENTRY;
2397
2398         LASSERT(dt_object_exists(dt));
2399         LASSERT(osd_invariant(obj));
2400         LASSERT(inode != NULL);
2401
2402         CDEBUG(D_INODE, "fallocate: inode #%lu: start %llu end %llu mode %d\n",
2403                inode->i_ino, start, end, mode);
2404
2405         dquot_initialize(inode);
2406
2407         LASSERT(th);
2408
2409         boff = start >> inode->i_blkbits;
2410         blen = (ALIGN(end, 1 << inode->i_blkbits) >> inode->i_blkbits) - boff;
2411
2412         /* Create and mark new extents as either zero or unwritten */
2413         flags = (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks ||
2414                  !ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS)) ?
2415                 LDISKFS_GET_BLOCKS_CREATE_ZERO :
2416                 LDISKFS_GET_BLOCKS_CREATE_UNWRIT_EXT;
2417 #ifdef LDISKFS_GET_BLOCKS_KEEP_SIZE
2418         if (mode & FALLOC_FL_KEEP_SIZE)
2419                 flags |= LDISKFS_GET_BLOCKS_KEEP_SIZE;
2420 #endif
2421         inode_lock(inode);
2422
2423         if (!(mode & FALLOC_FL_KEEP_SIZE) && (end > i_size_read(inode) ||
2424             end > LDISKFS_I(inode)->i_disksize)) {
2425                 new_size = end;
2426                 rc = inode_newsize_ok(inode, new_size);
2427                 if (rc)
2428                         GOTO(out, rc);
2429         }
2430
2431         inode_dio_wait(inode);
2432
2433         map.m_lblk = boff;
2434         map.m_len = blen;
2435
2436         /* Don't normalize the request if it can fit in one extent so
2437          * that it doesn't get unnecessarily split into multiple extents.
2438          */
2439         if (blen <= EXT_UNWRITTEN_MAX_LEN)
2440                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2441
2442         /*
2443          * credits to insert 1 extent into extent tree.
2444          */
2445         credits = osd_chunk_trans_blocks(inode, blen);
2446         depth = ext_depth(inode);
2447
2448         while (rc >= 0 && blen) {
2449                 loff_t epos;
2450
2451                 /*
2452                  * Recalculate credits when extent tree depth changes.
2453                  */
2454                 if (depth != ext_depth(inode)) {
2455                         credits = osd_chunk_trans_blocks(inode, blen);
2456                         depth = ext_depth(inode);
2457                 }
2458
2459                 /* TODO: quota check */
2460                 rc = osd_extend_restart_trans(handle, credits, inode);
2461                 if (rc)
2462                         break;
2463
2464                 rc = ldiskfs_map_blocks(handle, inode, &map, flags);
2465                 if (rc <= 0) {
2466                         CDEBUG(D_INODE,
2467                                "inode #%lu: block %u: len %u: ldiskfs_map_blocks returned %d\n",
2468                                inode->i_ino, map.m_lblk, map.m_len, rc);
2469                         ldiskfs_mark_inode_dirty(handle, inode);
2470                         break;
2471                 }
2472
2473                 map.m_lblk += rc;
2474                 map.m_len = blen = blen - rc;
2475                 epos = (loff_t)map.m_lblk << inode->i_blkbits;
2476                 inode->i_ctime = current_time(inode);
2477                 if (new_size) {
2478                         if (epos > end)
2479                                 epos = end;
2480                         if (ldiskfs_update_inode_size(inode, epos) & 0x1)
2481                                 inode->i_mtime = inode->i_ctime;
2482 #ifdef LDISKFS_EOFBLOCKS_FL
2483                 } else {
2484                         if (epos > inode->i_size)
2485                                 ldiskfs_set_inode_flag(inode,
2486                                                        LDISKFS_INODE_EOFBLOCKS);
2487 #endif
2488                 }
2489
2490                 ldiskfs_mark_inode_dirty(handle, inode);
2491         }
2492
2493 out:
2494         /* extand credits if needed for operations such as attribute set */
2495         if (rc >= 0)
2496                 rc = osd_extend_restart_trans(handle, save_credits, inode);
2497
2498         inode_unlock(inode);
2499
2500         RETURN(rc);
2501 }
2502
2503 static int osd_fallocate_punch(const struct lu_env *env, struct dt_object *dt,
2504                                __u64 start, __u64 end, int mode,
2505                                struct thandle *th)
2506 {
2507         struct osd_object *obj = osd_dt_obj(dt);
2508         struct inode *inode = obj->oo_inode;
2509         struct osd_access_lock *al;
2510         struct osd_thandle *oh;
2511         int rc = 0, found = 0;
2512
2513         ENTRY;
2514
2515         LASSERT(dt_object_exists(dt));
2516         LASSERT(osd_invariant(obj));
2517         LASSERT(inode != NULL);
2518
2519         dquot_initialize(inode);
2520
2521         LASSERT(th);
2522         oh = container_of(th, struct osd_thandle, ot_super);
2523         LASSERT(oh->ot_handle->h_transaction != NULL);
2524
2525         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2526                 if (obj != al->tl_obj)
2527                         continue;
2528                 LASSERT(al->tl_shared == 0);
2529                 found = 1;
2530                 /* do actual punch in osd_trans_stop() */
2531                 al->tl_start = start;
2532                 al->tl_end = end;
2533                 al->tl_mode = mode;
2534                 al->tl_punch = true;
2535                 break;
2536         }
2537
2538         RETURN(rc);
2539 }
2540
2541 static int osd_fallocate(const struct lu_env *env, struct dt_object *dt,
2542                          __u64 start, __u64 end, int mode, struct thandle *th)
2543 {
2544         int rc;
2545
2546         ENTRY;
2547
2548         if (mode & FALLOC_FL_PUNCH_HOLE) {
2549                 /* punch */
2550                 rc = osd_fallocate_punch(env, dt, start, end, mode, th);
2551         } else {
2552                 /* standard preallocate */
2553                 rc = osd_fallocate_preallocate(env, dt, start, end, mode, th);
2554         }
2555         RETURN(rc);
2556 }
2557
2558 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
2559                              __u64 start, __u64 end, struct thandle *th)
2560 {
2561         struct osd_thandle *oh;
2562         struct osd_object  *obj = osd_dt_obj(dt);
2563         struct inode       *inode;
2564         int                 rc;
2565         ENTRY;
2566
2567         LASSERT(th);
2568         oh = container_of(th, struct osd_thandle, ot_super);
2569
2570         /*
2571          * we don't need to reserve credits for whole truncate
2572          * it's not possible as truncate may need to free too many
2573          * blocks and that won't fit a single transaction. instead
2574          * we reserve credits to change i_size and put inode onto
2575          * orphan list. if needed truncate will extend or restart
2576          * transaction
2577          */
2578         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
2579                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
2580
2581         inode = obj->oo_inode;
2582         LASSERT(inode);
2583
2584         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2585                                    i_projid_read(inode), 0, oh, obj,
2586                                    NULL, OSD_QID_BLK);
2587
2588         /* if object holds encrypted content, we need to make sure we truncate
2589          * on an encryption unit boundary, or subsequent reads will get
2590          * corrupted content
2591          */
2592         if (rc == 0) {
2593                 if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2594                     start & ~LUSTRE_ENCRYPTION_MASK)
2595                         start = (start & LUSTRE_ENCRYPTION_MASK) +
2596                                 LUSTRE_ENCRYPTION_UNIT_SIZE;
2597                 ll_truncate_pagecache(inode, start);
2598                 rc = osd_trunc_lock(obj, oh, false);
2599         }
2600
2601         RETURN(rc);
2602 }
2603
2604 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
2605                      __u64 start, __u64 end, struct thandle *th)
2606 {
2607         struct osd_object *obj = osd_dt_obj(dt);
2608         struct osd_device *osd = osd_obj2dev(obj);
2609         struct inode *inode = obj->oo_inode;
2610         struct osd_access_lock *al;
2611         struct osd_thandle *oh;
2612         int rc = 0, found = 0;
2613         bool grow = false;
2614         ENTRY;
2615
2616         LASSERT(dt_object_exists(dt));
2617         LASSERT(osd_invariant(obj));
2618         LASSERT(inode != NULL);
2619         dquot_initialize(inode);
2620
2621         LASSERT(th);
2622         oh = container_of(th, struct osd_thandle, ot_super);
2623         LASSERT(oh->ot_handle->h_transaction != NULL);
2624
2625         /* we used to skip truncate to current size to
2626          * optimize truncates on OST. with DoM we can
2627          * get attr_set to set specific size (MDS_REINT)
2628          * and then get truncate RPC which essentially
2629          * would be skipped. this is bad.. so, disable
2630          * this optimization on MDS till the client stop
2631          * to sent MDS_REINT (LU-11033) -bzzz
2632          */
2633         if (osd->od_is_ost && i_size_read(inode) == start)
2634                 RETURN(0);
2635
2636         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
2637
2638         spin_lock(&inode->i_lock);
2639         if (i_size_read(inode) < start)
2640                 grow = true;
2641         i_size_write(inode, start);
2642         spin_unlock(&inode->i_lock);
2643
2644         /* optimize grow case */
2645         if (grow) {
2646                 osd_execute_truncate(obj);
2647                 GOTO(out, rc);
2648         }
2649
2650         inode_lock(inode);
2651         /* add to orphan list to ensure truncate completion
2652          * if this transaction succeed. ldiskfs_truncate()
2653          * will take the inode out of the list
2654          */
2655         rc = ldiskfs_orphan_add(oh->ot_handle, inode);
2656         inode_unlock(inode);
2657         if (rc != 0)
2658                 GOTO(out, rc);
2659
2660         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2661                 if (obj != al->tl_obj)
2662                         continue;
2663                 LASSERT(al->tl_shared == 0);
2664                 found = 1;
2665                 /* do actual truncate in osd_trans_stop() */
2666                 al->tl_truncate = 1;
2667                 break;
2668         }
2669         LASSERT(found);
2670
2671 out:
2672         RETURN(rc);
2673 }
2674
2675 static int fiemap_check_ranges(struct inode *inode,
2676                                u64 start, u64 len, u64 *new_len)
2677 {
2678         loff_t maxbytes;
2679
2680         *new_len = len;
2681
2682         if (len == 0)
2683                 return -EINVAL;
2684
2685         if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
2686                 maxbytes = inode->i_sb->s_maxbytes;
2687         else
2688                 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
2689
2690         if (start > maxbytes)
2691                 return -EFBIG;
2692
2693         /*
2694          * Shrink request scope to what the fs can actually handle.
2695          */
2696         if (len > maxbytes || (maxbytes - len) < start)
2697                 *new_len = maxbytes - start;
2698
2699         return 0;
2700 }
2701
2702 /* So that the fiemap access checks can't overflow on 32 bit machines. */
2703 #define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
2704
2705 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
2706                           struct fiemap *fm)
2707 {
2708         struct fiemap_extent_info fieinfo = {0, };
2709         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2710         u64 len;
2711         int rc;
2712         DECLARE_MM_SEGMENT_T(saved_fs);
2713
2714         LASSERT(inode);
2715         if (inode->i_op->fiemap == NULL)
2716                 return -EOPNOTSUPP;
2717
2718         if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
2719                 return -EINVAL;
2720
2721         rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
2722         if (rc)
2723                 return rc;
2724
2725         fieinfo.fi_flags = fm->fm_flags;
2726         fieinfo.fi_extents_max = fm->fm_extent_count;
2727         fieinfo.fi_extents_start = fm->fm_extents;
2728
2729         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
2730                 filemap_write_and_wait(inode->i_mapping);
2731
2732         access_set_kernel(saved_fs, &fieinfo);
2733         rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
2734         access_unset_kernel(saved_fs, &fieinfo);
2735         fm->fm_flags = fieinfo.fi_flags;
2736         fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
2737
2738         return rc;
2739 }
2740
2741 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
2742                        __u64 start, __u64 end, enum lu_ladvise_type advice)
2743 {
2744         struct osd_object *obj = osd_dt_obj(dt);
2745         int rc = 0;
2746         ENTRY;
2747
2748         switch (advice) {
2749         case LU_LADVISE_DONTNEED:
2750                 if (end)
2751                         invalidate_mapping_pages(obj->oo_inode->i_mapping,
2752                                                  start >> PAGE_SHIFT,
2753                                                  (end - 1) >> PAGE_SHIFT);
2754                 break;
2755         default:
2756                 rc = -ENOTSUPP;
2757                 break;
2758         }
2759
2760         RETURN(rc);
2761 }
2762
2763 static loff_t osd_lseek(const struct lu_env *env, struct dt_object *dt,
2764                         loff_t offset, int whence)
2765 {
2766         struct osd_object *obj = osd_dt_obj(dt);
2767         struct osd_device *dev = osd_obj2dev(obj);
2768         struct inode *inode = obj->oo_inode;
2769         struct file *file;
2770         loff_t result;
2771
2772         ENTRY;
2773         LASSERT(dt_object_exists(dt));
2774         LASSERT(osd_invariant(obj));
2775         LASSERT(inode);
2776         LASSERT(offset >= 0);
2777
2778         file = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
2779                                  inode->i_fop);
2780         if (IS_ERR(file))
2781                 RETURN(PTR_ERR(file));
2782
2783         file->f_mode |= FMODE_64BITHASH;
2784         result = file->f_op->llseek(file, offset, whence);
2785         ihold(inode);
2786         fput(file);
2787         /*
2788          * If 'offset' is beyond end of object file then treat it as not error
2789          * but valid case for SEEK_HOLE and return 'offset' as result.
2790          * LOV will decide if it is beyond real end of file or not.
2791          */
2792         if (whence == SEEK_HOLE && result == -ENXIO)
2793                 result = offset;
2794
2795         CDEBUG(D_INFO, "seek %s from %lld: %lld\n", whence == SEEK_HOLE ?
2796                        "hole" : "data", offset, result);
2797         RETURN(result);
2798 }
2799
2800 /*
2801  * in some cases we may need declare methods for objects being created
2802  * e.g., when we create symlink
2803  */
2804 const struct dt_body_operations osd_body_ops_new = {
2805         .dbo_declare_write = osd_declare_write,
2806 };
2807
2808 const struct dt_body_operations osd_body_ops = {
2809         .dbo_read                       = osd_read,
2810         .dbo_declare_write              = osd_declare_write,
2811         .dbo_write                      = osd_write,
2812         .dbo_bufs_get                   = osd_bufs_get,
2813         .dbo_bufs_put                   = osd_bufs_put,
2814         .dbo_write_prep                 = osd_write_prep,
2815         .dbo_declare_write_commit       = osd_declare_write_commit,
2816         .dbo_write_commit               = osd_write_commit,
2817         .dbo_read_prep                  = osd_read_prep,
2818         .dbo_declare_punch              = osd_declare_punch,
2819         .dbo_punch                      = osd_punch,
2820         .dbo_fiemap_get                 = osd_fiemap_get,
2821         .dbo_ladvise                    = osd_ladvise,
2822         .dbo_declare_fallocate          = osd_declare_fallocate,
2823         .dbo_fallocate                  = osd_fallocate,
2824         .dbo_lseek                      = osd_lseek,
2825 };
2826
2827 /**
2828  * Get a truncate lock
2829  *
2830  * In order to take multi-transaction truncate out of main transaction we let
2831  * the caller grab a lock on the object passed. the lock can be shared (for
2832  * writes) and exclusive (for truncate). It's not allowed to mix truncate
2833  * and write in the same transaction handle (do not confuse with big ldiskfs
2834  * transaction containing lots of handles).
2835  * The lock must be taken at declaration.
2836  *
2837  * \param obj           object to lock
2838  * \oh                  transaction
2839  * \shared              shared or exclusive
2840  *
2841  * \retval 0            lock is granted
2842  * \retval -NOMEM       no memory to allocate lock
2843  */
2844 int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared)
2845 {
2846         struct osd_access_lock *al, *tmp;
2847
2848         LASSERT(obj);
2849         LASSERT(oh);
2850
2851         list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) {
2852                 if (tmp->tl_obj != obj)
2853                         continue;
2854                 LASSERT(tmp->tl_shared == shared);
2855                 /* found same lock */
2856                 return 0;
2857         }
2858
2859         OBD_ALLOC_PTR(al);
2860         if (unlikely(al == NULL))
2861                 return -ENOMEM;
2862         al->tl_obj = obj;
2863         al->tl_truncate = false;
2864         if (shared)
2865                 down_read(&obj->oo_ext_idx_sem);
2866         else
2867                 down_write(&obj->oo_ext_idx_sem);
2868         al->tl_shared = shared;
2869         lu_object_get(&obj->oo_dt.do_lu);
2870
2871         list_add(&al->tl_list, &oh->ot_trunc_locks);
2872
2873         return 0;
2874 }
2875
2876 void osd_trunc_unlock_all(const struct lu_env *env, struct list_head *list)
2877 {
2878         struct osd_access_lock *al, *tmp;
2879
2880         list_for_each_entry_safe(al, tmp, list, tl_list) {
2881                 if (al->tl_shared)
2882                         up_read(&al->tl_obj->oo_ext_idx_sem);
2883                 else
2884                         up_write(&al->tl_obj->oo_ext_idx_sem);
2885                 osd_object_put(env, al->tl_obj);
2886                 list_del(&al->tl_list);
2887                 OBD_FREE_PTR(al);
2888         }
2889 }
2890
2891 /* For a partial-page punch, flush punch range to disk immediately */
2892 static void osd_partial_page_flush_punch(struct osd_device *d,
2893                                          struct inode *inode, loff_t start,
2894                                          loff_t end)
2895 {
2896         if (osd_use_page_cache(d)) {
2897                 filemap_fdatawrite_range(inode->i_mapping, start, end);
2898         } else {
2899                 /* Notice we use "wait" version to ensure I/O is complete */
2900                 filemap_write_and_wait_range(inode->i_mapping, start,
2901                                              end);
2902                 invalidate_mapping_pages(inode->i_mapping, start >> PAGE_SHIFT,
2903                                          end >> PAGE_SHIFT);
2904         }
2905 }
2906
2907 /*
2908  * For a partial-page truncate, flush the page to disk immediately to
2909  * avoid data corruption during direct disk write.  b=17397
2910  */
2911 static void osd_partial_page_flush(struct osd_device *d, struct inode *inode,
2912                                    loff_t offset)
2913 {
2914         if (!(offset & ~PAGE_MASK))
2915                 return;
2916
2917         if (osd_use_page_cache(d)) {
2918                 filemap_fdatawrite_range(inode->i_mapping, offset, offset + 1);
2919         } else {
2920                 /* Notice we use "wait" version to ensure I/O is complete */
2921                 filemap_write_and_wait_range(inode->i_mapping, offset,
2922                                              offset + 1);
2923                 invalidate_mapping_pages(inode->i_mapping, offset >> PAGE_SHIFT,
2924                                          offset >> PAGE_SHIFT);
2925         }
2926 }
2927
2928 void osd_execute_truncate(struct osd_object *obj)
2929 {
2930         struct osd_device *d = osd_obj2dev(obj);
2931         struct inode *inode = obj->oo_inode;
2932         __u64 size;
2933
2934         /* simulate crash before (in the middle) of delayed truncate */
2935         if (CFS_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) {
2936                 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2937                 struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb);
2938
2939                 mutex_lock(&sbi->s_orphan_lock);
2940                 list_del_init(&ei->i_orphan);
2941                 mutex_unlock(&sbi->s_orphan_lock);
2942                 return;
2943         }
2944
2945         size = i_size_read(inode);
2946         inode_lock(inode);
2947         /* if object holds encrypted content, we need to make sure we truncate
2948          * on an encryption unit boundary, or block content will get corrupted
2949          */
2950         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2951             size & ~LUSTRE_ENCRYPTION_MASK)
2952                 inode->i_size = (size & LUSTRE_ENCRYPTION_MASK) +
2953                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2954         ldiskfs_truncate(inode);
2955         inode_unlock(inode);
2956         if (inode->i_size != size) {
2957                 spin_lock(&inode->i_lock);
2958                 i_size_write(inode, size);
2959                 LDISKFS_I(inode)->i_disksize = size;
2960                 spin_unlock(&inode->i_lock);
2961                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2962         }
2963         osd_partial_page_flush(d, inode, size);
2964 }
2965
2966 static int osd_execute_punch(const struct lu_env *env, struct osd_object *obj,
2967                              loff_t start, loff_t end, int mode)
2968 {
2969         struct osd_device *d = osd_obj2dev(obj);
2970         struct inode *inode = obj->oo_inode;
2971         struct file *file;
2972         int rc;
2973
2974         file = alloc_file_pseudo(inode, d->od_mnt, "/", O_NOATIME,
2975                                  inode->i_fop);
2976         if (IS_ERR(file))
2977                 RETURN(PTR_ERR(file));
2978
2979         file->f_mode |= FMODE_64BITHASH;
2980         rc = file->f_op->fallocate(file, mode, start, end - start);
2981         ihold(inode);
2982         fput(file);
2983         if (rc == 0)
2984                 osd_partial_page_flush_punch(d, inode, start, end - 1);
2985         return rc;
2986 }
2987
2988 int osd_process_truncates(const struct lu_env *env, struct list_head *list)
2989 {
2990         struct osd_access_lock *al;
2991         int rc = 0;
2992
2993         LASSERT(!journal_current_handle());
2994
2995         list_for_each_entry(al, list, tl_list) {
2996                 if (al->tl_shared)
2997                         continue;
2998                 if (al->tl_truncate)
2999                         osd_execute_truncate(al->tl_obj);
3000                 else if (al->tl_punch)
3001                         rc = osd_execute_punch(env, al->tl_obj, al->tl_start,
3002                                                al->tl_end, al->tl_mode);
3003         }
3004
3005         return rc;
3006 }