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 #ifndef SECTOR_SHIFT
  63 #define SECTOR_SHIFT 9
  64 #endif
  65
  66 struct kmem_cache *biop_cachep;
  67
  68 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
  69 static void dio_complete_routine(struct bio *bio);
  70 #else
  71 static void dio_complete_routine(struct bio *bio, int error);
  72 #endif
  73
  74 static int osd_bio_init(struct bio *bio, struct osd_iobuf *iobuf,
  75                         int start_page_idx)
  76 {
  77         struct osd_bio_private *bio_private = NULL;
  78         ENTRY;
  79
  80         OBD_SLAB_ALLOC_GFP(bio_private, biop_cachep, sizeof(*bio_private),
  81                            GFP_NOIO);
  82         if (bio_private == NULL)
  83                 RETURN(-ENOMEM);
  84
  85         bio->bi_end_io = dio_complete_routine;
  86         bio->bi_private = bio_private;
  87         bio_private->obp_start_page_idx = start_page_idx;
  88         bio_private->obp_iobuf = iobuf;
  89
  90         RETURN(0);
  91 }
  92
  93 static void osd_bio_fini(struct bio *bio)
  94 {
  95         struct osd_bio_private *bio_private;
  96
  97         if (!bio)
  98                 return;
  99         bio_private = bio->bi_private;
 100         bio_put(bio);
 101         OBD_SLAB_FREE(bio_private, biop_cachep, sizeof(*bio_private));
 102 }
 103
 104 static inline bool osd_use_page_cache(struct osd_device *d)
 105 {
 106         /* do not use pagecache if write and read caching are disabled */
 107         if (d->od_writethrough_cache + d->od_read_cache == 0)
 108                 return false;
 109         /* use pagecache by default */
 110         return true;
 111 }
 112
 113 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
 114                             struct inode *inode,
 115                             int rw, const short line, int pages)
 116 {
 117         int blocks, i;
 118
 119         LASSERTF(iobuf->dr_elapsed_valid == 0,
 120                  "iobuf %px, reqs %d, rw %d, line %d\n", iobuf,
 121                  atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
 122                  iobuf->dr_init_at);
 123         LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
 124
 125         init_waitqueue_head(&iobuf->dr_wait);
 126         atomic_set(&iobuf->dr_numreqs, 0);
 127         iobuf->dr_npages = 0;
 128         iobuf->dr_lextents = 0;
 129         iobuf->dr_pextents = 0;
 130
 131         iobuf->dr_error = 0;
 132         iobuf->dr_dev = d;
 133         iobuf->dr_frags = 0;
 134         iobuf->dr_elapsed = ktime_set(0, 0);
 135         /* must be counted before, so assert */
 136         iobuf->dr_rw = rw;
 137         iobuf->dr_init_at = line;
 138         iobuf->dr_inode = inode;
 139
 140         /* Init dr_start_pg_wblks to 0 for osd_read/write_prep().
 141          * For osd_write_commit() need to keep the value assigned in
 142          * osd_ldiskfs_map_inode_pages() during retries, and before it ,
 143          * init dr_start_pg_wblks to 0 in osd_write_prep() is sufficient.
 144          */
 145         if (rw == 0)
 146                 iobuf->dr_start_pg_wblks = 0;
 147
 148         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
 149         if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
 150                 return 0;
 151         }
 152
 153         /* start with 1MB for 4K blocks */
 154         i = 256;
 155         while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
 156                 i <<= 1;
 157
 158         CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
 159                (unsigned int)(pages * sizeof(iobuf->dr_lnbs[0])), i, pages);
 160         pages = i;
 161         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
 162         iobuf->dr_max_pages = 0;
 163         CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
 164                (unsigned int)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
 165
 166         lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
 167         iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
 168         if (unlikely(iobuf->dr_blocks == NULL))
 169                 return -ENOMEM;
 170
 171         lu_buf_realloc(&iobuf->dr_lnb_buf,
 172                        pages * sizeof(iobuf->dr_lnbs[0]));
 173         iobuf->dr_lnbs = iobuf->dr_lnb_buf.lb_buf;
 174         if (unlikely(iobuf->dr_lnbs == NULL))
 175                 return -ENOMEM;
 176
 177         iobuf->dr_max_pages = pages;
 178
 179         return 0;
 180 }
 181
 182 #define osd_init_iobuf(dev, iobuf, inode, rw, pages)                    \
 183 ({                                                                      \
 184         int __r;                                                        \
 185         BUILD_BUG_ON(__LINE__ >= (1 << 16));                            \
 186         __r = __osd_init_iobuf(dev, iobuf, inode, rw, __LINE__, pages); \
 187         __r;                                                            \
 188 })
 189
 190 static void osd_iobuf_add_page(struct osd_iobuf *iobuf,
 191                                struct niobuf_local *lnb)
 192 {
 193         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
 194         iobuf->dr_lnbs[iobuf->dr_npages] = lnb;
 195         iobuf->dr_npages++;
 196 }
 197
 198 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
 199 {
 200         int rw = iobuf->dr_rw;
 201
 202         if (iobuf->dr_elapsed_valid) {
 203                 struct brw_stats *h = &d->od_brw_stats;
 204
 205                 iobuf->dr_elapsed_valid = 0;
 206                 LASSERT(iobuf->dr_dev == d);
 207                 LASSERT(iobuf->dr_frags > 0);
 208                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_DIO_FRAGS+rw],
 209                                       iobuf->dr_frags);
 210                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_IO_TIME+rw],
 211                                            ktime_to_ms(iobuf->dr_elapsed));
 212         }
 213
 214         iobuf->dr_error = 0;
 215 }
 216
 217 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 218 static void dio_complete_routine(struct bio *bio)
 219 {
 220         int error = blk_status_to_errno(bio->bi_status);
 221 #else
 222 static void dio_complete_routine(struct bio *bio, int error)
 223 {
 224 #endif
 225         struct osd_bio_private *bio_private = bio->bi_private;
 226         struct osd_iobuf *iobuf = bio_private->obp_iobuf;
 227         struct bio_vec *bvl;
 228
 229
 230         /* CAVEAT EMPTOR: possibly in IRQ context
 231          * DO NOT record procfs stats here!!!
 232          */
 233         if (unlikely(iobuf == NULL)) {
 234                 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");
 235                 CERROR("bi_next: %p, bi_flags: %lx, " __stringify(bi_opf)
 236                        ": %x, bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, bi_private: %p\n",
 237                        bio->bi_next, (unsigned long)bio->bi_flags,
 238                        (unsigned int)bio->bi_opf, bio->bi_vcnt, bio_idx(bio),
 239                        bio_sectors(bio) << 9, bio->bi_end_io,
 240                        atomic_read(&bio->__bi_cnt),
 241                        bio->bi_private);
 242                 return;
 243         }
 244
 245         /* the check is outside of the cycle for performance reason -bzzz */
 246         if (!bio_data_dir(bio)) {
 247                 DECLARE_BVEC_ITER_ALL(iter_all);
 248
 249                 bio_for_each_segment_all(bvl, bio, iter_all) {
 250                         if (likely(error == 0))
 251                                 SetPageUptodate(bvl_to_page(bvl));
 252                         LASSERT(PageLocked(bvl_to_page(bvl)));
 253                 }
 254                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
 255         } else {
 256                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
 257         }
 258
 259         /* any real error is good enough -bzzz */
 260         if (error != 0 && iobuf->dr_error == 0)
 261                 iobuf->dr_error = error;
 262
 263         /*
 264          * set dr_elapsed before dr_numreqs turns to 0, otherwise
 265          * it's possible that service thread will see dr_numreqs
 266          * is zero, but dr_elapsed is not set yet, leading to lost
 267          * data in this processing and an assertion in a subsequent
 268          * call to OSD.
 269          */
 270         if (atomic_read(&iobuf->dr_numreqs) == 1) {
 271                 ktime_t now = ktime_get();
 272
 273                 iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time);
 274                 iobuf->dr_elapsed_valid = 1;
 275         }
 276         if (atomic_dec_and_test(&iobuf->dr_numreqs))
 277                 wake_up(&iobuf->dr_wait);
 278
 279         /* Completed bios used to be chained off iobuf->dr_bios and freed in
 280          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
 281          * mempool when serious on-disk fragmentation was encountered,
 282          * deadlocking the OST.  The bios are now released as soon as complete
 283          * so the pool cannot be exhausted while IOs are competing. b=10076
 284          */
 285         osd_bio_fini(bio);
 286 }
 287
 288 static void record_start_io(struct osd_iobuf *iobuf, int size)
 289 {
 290         struct osd_device *osd = iobuf->dr_dev;
 291         struct brw_stats *h = &osd->od_brw_stats;
 292
 293         iobuf->dr_frags++;
 294         atomic_inc(&iobuf->dr_numreqs);
 295
 296         if (iobuf->dr_rw == 0) {
 297                 atomic_inc(&osd->od_r_in_flight);
 298                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_RPC_HIST],
 299                                  atomic_read(&osd->od_r_in_flight));
 300                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_DISK_IOSIZE],
 301                                            size);
 302         } else if (iobuf->dr_rw == 1) {
 303                 atomic_inc(&osd->od_w_in_flight);
 304                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_W_RPC_HIST],
 305                                  atomic_read(&osd->od_w_in_flight));
 306                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_W_DISK_IOSIZE],
 307                                            size);
 308         } else {
 309                 LBUG();
 310         }
 311 }
 312
 313 static int osd_submit_bio(struct osd_device *osd,
 314                           struct osd_iobuf *iobuf,
 315                           struct bio *bio)
 316 {
 317         struct request_queue *q;
 318         unsigned int bi_size;
 319         int rc = 0;
 320
 321         if (bio == NULL)
 322                 return 0;
 323
 324         q = bio_get_queue(bio);
 325         bi_size = bio_sectors(bio) << SECTOR_SHIFT;
 326         /* Dang! I have to fragment this I/O */
 327         CDEBUG(D_INODE,
 328                "bio++ sz %d vcnt %d(%d) sectors %d(%d) psg %d(%d)\n",
 329                bi_size, bio->bi_vcnt, bio->bi_max_vecs,
 330                bio_sectors(bio),
 331                queue_max_sectors(q),
 332                osd_bio_nr_segs(bio),
 333                queue_max_segments(q));
 334
 335         rc = osd_bio_integrity_handle(osd, bio, iobuf);
 336         if (rc)
 337                 goto out;
 338
 339         record_start_io(iobuf, bi_size);
 340
 341 #ifdef HAVE_SUBMIT_BIO_2ARGS
 342         submit_bio(iobuf->dr_rw ? WRITE : READ, bio);
 343 #else
 344         bio->bi_opf |= iobuf->dr_rw;
 345         submit_bio(bio);
 346 #endif
 347 out:
 348         return rc;
 349 }
 350
 351 static int can_be_merged(struct bio *bio, sector_t sector)
 352 {
 353
 354         return bio_end_sector(bio) == sector ? 1 : 0;
 355 }
 356
 357
 358 static void osd_mark_page_io_done(struct osd_iobuf *iobuf,
 359                                   struct inode *inode,
 360                                   sector_t start_blocks,
 361                                   sector_t count)
 362 {
 363         struct niobuf_local **lnbs = iobuf->dr_lnbs;
 364         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 365         int i, end;
 366
 367         i = start_blocks / blocks_per_page;
 368         end = (start_blocks + count) / blocks_per_page;
 369         for ( ; i < end; i++)
 370                 lnbs[i]->lnb_flags |= OBD_BRW_DONE;
 371 }
 372
 373 /*
 374  * Linux v5.12-rc1-20-ga8affc03a9b3
 375  *  block: rename BIO_MAX_PAGES to BIO_MAX_VECS
 376  */
 377 #ifndef BIO_MAX_VECS
 378 #define BIO_MAX_VECS    BIO_MAX_PAGES
 379 #endif
 380
 381 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
 382                       struct osd_iobuf *iobuf, sector_t start_blocks,
 383                       sector_t count)
 384 {
 385         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 386         struct niobuf_local **lnbs = iobuf->dr_lnbs;
 387         int npages = iobuf->dr_npages;
 388         sector_t *blocks = iobuf->dr_blocks;
 389         struct super_block *sb = inode->i_sb;
 390         int sector_bits = sb->s_blocksize_bits - SECTOR_SHIFT;
 391         unsigned int blocksize = sb->s_blocksize;
 392         struct block_device *bdev = sb->s_bdev;
 393         struct bio *bio = NULL;
 394         int bio_start_page_idx = 0;
 395         struct page *page;
 396         unsigned int page_offset;
 397         sector_t sector;
 398         int nblocks;
 399         int block_idx, block_idx_end;
 400         int page_idx, page_idx_start;
 401         int i;
 402         int rc = 0;
 403         bool integrity_enabled;
 404         struct blk_plug plug;
 405         int blocks_left_page;
 406
 407         ENTRY;
 408
 409         LASSERT(iobuf->dr_npages == npages);
 410         iobuf->dr_start_time = ktime_get();
 411         integrity_enabled = bdev_integrity_enabled(bdev, iobuf->dr_rw);
 412
 413         if (!count)
 414                 count = npages * blocks_per_page;
 415         block_idx_end = start_blocks + count;
 416
 417         blk_start_plug(&plug);
 418
 419         page_idx_start = start_blocks / blocks_per_page;
 420         for (page_idx = page_idx_start, block_idx = start_blocks;
 421              block_idx < block_idx_end; page_idx++,
 422              block_idx += blocks_left_page) {
 423                 /* For cases where the filesystems blocksize is not the
 424                  * same as PAGE_SIZE (e.g. ARM with PAGE_SIZE=64KB and
 425                  * blocksize=4KB), there will be multiple blocks to
 426                  * read/write per page. Also, the start and end block may
 427                  * not be aligned to the start and end of the page, so the
 428                  * first page may skip some blocks at the start ("i != 0",
 429                  * "blocks_left_page" is reduced), and the last page may
 430                  * skip some blocks at the end (limited by "count").
 431                  */
 432                 page = lnbs[page_idx]->lnb_page;
 433                 LASSERT(page_idx < iobuf->dr_npages);
 434
 435                 i = block_idx % blocks_per_page;
 436                 blocks_left_page = blocks_per_page - i;
 437                 if (block_idx + blocks_left_page > block_idx_end)
 438                         blocks_left_page = block_idx_end - block_idx;
 439                 page_offset = i * blocksize;
 440                 for (i = 0; i < blocks_left_page;
 441                      i += nblocks, page_offset += blocksize * nblocks) {
 442                         nblocks = 1;
 443
 444                         if (blocks[block_idx + i] == 0) {  /* hole */
 445                                 LASSERTF(iobuf->dr_rw == 0,
 446                                          "page_idx %u, block_idx %u, i %u,"
 447                                          "start_blocks: %llu, count: %llu, npages: %d\n",
 448                                          page_idx, block_idx, i,
 449                                          (unsigned long long)start_blocks,
 450                                          (unsigned long long)count, npages);
 451                                 memset(kmap(page) + page_offset, 0, blocksize);
 452                                 kunmap(page);
 453                                 continue;
 454                         }
 455
 456                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
 457
 458                         /* Additional contiguous file blocks? */
 459                         while (i + nblocks < blocks_left_page &&
 460                                (sector + (nblocks << sector_bits)) ==
 461                                ((sector_t)blocks[block_idx + i + nblocks] <<
 462                                  sector_bits))
 463                                 nblocks++;
 464
 465                         if (bio && can_be_merged(bio, sector) &&
 466                             bio_add_page(bio, page, blocksize * nblocks,
 467                                          page_offset) != 0)
 468                                 continue;       /* added this frag OK */
 469
 470                         rc = osd_submit_bio(osd, iobuf, bio);
 471                         if (rc)
 472                                 goto out;
 473
 474                         bio_start_page_idx = page_idx;
 475                         /* allocate new bio */
 476                         bio = cfs_bio_alloc(bdev,
 477                                             min_t(unsigned short, BIO_MAX_VECS,
 478                                                   (block_idx_end - block_idx +
 479                                                    blocks_left_page - 1)),
 480                                             iobuf->dr_rw ? REQ_OP_WRITE
 481                                                          : REQ_OP_READ,
 482                                             GFP_NOIO);
 483                         if (!bio) {
 484                                 CERROR("Can't allocate bio %u pages\n",
 485                                        block_idx_end - block_idx +
 486                                        blocks_left_page - 1);
 487                                 rc = -ENOMEM;
 488                                 goto out;
 489                         }
 490                         bio_set_sector(bio, sector);
 491                         rc = osd_bio_init(bio, iobuf, bio_start_page_idx);
 492                         if (rc)
 493                                 goto out;
 494
 495                         rc = bio_add_page(bio, page,
 496                                           blocksize * nblocks, page_offset);
 497                         LASSERT(rc != 0);
 498                 }
 499         }
 500         rc = osd_submit_bio(osd, iobuf, bio);
 501         if (rc)
 502                 goto out;
 503 out:
 504         blk_finish_plug(&plug);
 505
 506         /* in order to achieve better IO throughput, we don't wait for writes
 507          * completion here. instead we proceed with transaction commit in
 508          * parallel and wait for IO completion once transaction is stopped
 509          * see osd_trans_stop() for more details -bzzz
 510          */
 511         if (iobuf->dr_rw == 0 || CFS_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT)) {
 512                 wait_event(iobuf->dr_wait,
 513                            atomic_read(&iobuf->dr_numreqs) == 0);
 514         }
 515
 516         if (rc == 0)
 517                 rc = iobuf->dr_error;
 518         else
 519                 osd_bio_fini(bio);
 520
 521         if (iobuf->dr_rw == 0 || CFS_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT))
 522                 osd_fini_iobuf(osd, iobuf);
 523
 524         /* Write only now */
 525         if (rc == 0 && iobuf->dr_rw)
 526                 osd_mark_page_io_done(iobuf, inode,
 527                                       start_blocks, count);
 528
 529         RETURN(rc);
 530 }
 531
 532 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
 533                                    struct niobuf_local *lnb, int maxlnb)
 534 {
 535         int rc = 0;
 536         ENTRY;
 537
 538         *nrpages = 0;
 539
 540         while (len > 0) {
 541                 int poff = offset & (PAGE_SIZE - 1);
 542                 int plen = PAGE_SIZE - poff;
 543
 544                 if (*nrpages >= maxlnb) {
 545                         rc = -EOVERFLOW;
 546                         break;
 547                 }
 548
 549                 if (plen > len)
 550                         plen = len;
 551                 lnb->lnb_file_offset = offset;
 552                 lnb->lnb_page_offset = poff;
 553                 lnb->lnb_len = plen;
 554                 /* lnb->lnb_flags = rnb->rnb_flags; */
 555                 lnb->lnb_flags = 0;
 556                 lnb->lnb_page = NULL;
 557                 lnb->lnb_rc = 0;
 558                 lnb->lnb_guard_rpc = 0;
 559                 lnb->lnb_guard_disk = 0;
 560                 lnb->lnb_locked = 0;
 561
 562                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
 563                          (long long) len);
 564                 offset += plen;
 565                 len -= plen;
 566                 lnb++;
 567                 (*nrpages)++;
 568         }
 569
 570         RETURN(rc);
 571 }
 572
 573 static struct page *osd_get_page(const struct lu_env *env, struct dt_object *dt,
 574                                  loff_t offset, gfp_t gfp_mask, bool cache)
 575 {
 576         struct osd_thread_info *oti = osd_oti_get(env);
 577         struct inode *inode = osd_dt_obj(dt)->oo_inode;
 578         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
 579         struct page *page;
 580         int cur;
 581
 582         LASSERT(inode);
 583
 584         if (cache) {
 585                 page = find_or_create_page(inode->i_mapping,
 586                                            offset >> PAGE_SHIFT, gfp_mask);
 587
 588                 if (likely(page)) {
 589                         LASSERT(!PagePrivate2(page));
 590                         wait_on_page_writeback(page);
 591                 } else {
 592                         lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
 593                 }
 594
 595                 return page;
 596         }
 597
 598         if (inode->i_mapping->nrpages) {
 599                 /* consult with pagecache, but do not create new pages */
 600                 /* this is normally used once */
 601                 page = find_lock_page(inode->i_mapping, offset >> PAGE_SHIFT);
 602                 if (page) {
 603                         wait_on_page_writeback(page);
 604                         return page;
 605                 }
 606         }
 607
 608         LASSERT(oti->oti_dio_pages);
 609         cur = oti->oti_dio_pages_used;
 610         page = oti->oti_dio_pages[cur];
 611
 612         if (unlikely(!page)) {
 613                 LASSERT(cur < PTLRPC_MAX_BRW_PAGES);
 614                 page = alloc_page(gfp_mask);
 615                 if (!page)
 616                         return NULL;
 617                 oti->oti_dio_pages[cur] = page;
 618                 SetPagePrivate2(page);
 619                 lock_page(page);
 620         }
 621
 622         ClearPageUptodate(page);
 623         page->index = offset >> PAGE_SHIFT;
 624         oti->oti_dio_pages_used++;
 625
 626         return page;
 627 }
 628
 629 /*
 630  * there are following "locks":
 631  * journal_start
 632  * i_mutex
 633  * page lock
 634  *
 635  * osd write path:
 636  *  - lock page(s)
 637  *  - journal_start
 638  *  - truncate_sem
 639  *
 640  * ext4 vmtruncate:
 641  *  - lock pages, unlock
 642  *  - journal_start
 643  *  - lock partial page
 644  *  - i_data_sem
 645  *
 646  */
 647
 648 /**
 649  * Unlock and release pages loaded by osd_bufs_get()
 650  *
 651  * Unlock \a npages pages from \a lnb and drop the refcount on them.
 652  *
 653  * \param env           thread execution environment
 654  * \param dt            dt object undergoing IO (OSD object + methods)
 655  * \param lnb           array of pages undergoing IO
 656  * \param npages        number of pages in \a lnb
 657  *
 658  * \retval 0            always
 659  */
 660 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
 661                         struct niobuf_local *lnb, int npages)
 662 {
 663         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
 664         struct osd_thread_info *oti = osd_oti_get(env);
 665         struct osd_iobuf *iobuf = &oti->oti_iobuf;
 666         struct folio_batch fbatch;
 667         int i;
 668
 669         osd_brw_stats_update(osd, iobuf);
 670         ll_folio_batch_init(&fbatch, 0);
 671
 672         for (i = 0; i < npages; i++) {
 673                 struct page *page = lnb[i].lnb_page;
 674
 675                 if (page == NULL)
 676                         continue;
 677
 678                 /* if the page isn't cached, then reset uptodate
 679                  * to prevent reuse
 680                  */
 681                 if (PagePrivate2(page)) {
 682                         oti->oti_dio_pages_used--;
 683                 } else {
 684                         if (lnb[i].lnb_locked)
 685                                 unlock_page(page);
 686                         if (folio_batch_add_page(&fbatch, page) == 0)
 687                                 folio_batch_release(&fbatch);
 688                 }
 689
 690                 lnb[i].lnb_page = NULL;
 691         }
 692
 693         LASSERTF(oti->oti_dio_pages_used == 0, "%d\n", oti->oti_dio_pages_used);
 694
 695         /* Release any partial folio_batch */
 696         folio_batch_release(&fbatch);
 697
 698         RETURN(0);
 699 }
 700
 701 /**
 702  * Load and lock pages undergoing IO
 703  *
 704  * Pages as described in the \a lnb array are fetched (from disk or cache)
 705  * and locked for IO by the caller.
 706  *
 707  * DLM locking protects us from write and truncate competing for same region,
 708  * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
 709  * It's possible the writeout on a such a page is in progress when we access
 710  * it. It's also possible that during this writeout we put new (partial) data
 711  * into the page, but won't be able to proceed in filter_commitrw_write().
 712  * Therefore, just wait for writeout completion as it should be rare enough.
 713  *
 714  * \param env           thread execution environment
 715  * \param dt            dt object undergoing IO (OSD object + methods)
 716  * \param pos           byte offset of IO start
 717  * \param len           number of bytes of IO
 718  * \param lnb           array of extents undergoing IO
 719  * \param rw            read or write operation, and other flags
 720  * \param capa          capabilities
 721  *
 722  * \retval pages        (zero or more) loaded successfully
 723  * \retval -ENOMEM      on memory/page allocation error
 724  */
 725 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
 726                         loff_t pos, ssize_t len, struct niobuf_local *lnb,
 727                         int maxlnb, enum dt_bufs_type rw)
 728 {
 729         struct osd_thread_info *oti = osd_oti_get(env);
 730         struct osd_object *obj = osd_dt_obj(dt);
 731         struct osd_device *osd   = osd_obj2dev(obj);
 732         int npages, i, iosize, rc = 0;
 733         bool cache, write;
 734         loff_t fsize;
 735         gfp_t gfp_mask;
 736
 737         LASSERT(obj->oo_inode);
 738
 739         if (unlikely(obj->oo_destroyed))
 740                 RETURN(-ENOENT);
 741
 742         rc = osd_map_remote_to_local(pos, len, &npages, lnb, maxlnb);
 743         if (rc)
 744                 RETURN(rc);
 745
 746         write = rw & DT_BUFS_TYPE_WRITE;
 747
 748         fsize = lnb[npages - 1].lnb_file_offset + lnb[npages - 1].lnb_len;
 749         iosize = fsize - lnb[0].lnb_file_offset;
 750         fsize = max(fsize, i_size_read(obj->oo_inode));
 751
 752         cache = rw & DT_BUFS_TYPE_READAHEAD;
 753         if (cache)
 754                 goto bypass_checks;
 755
 756         cache = osd_use_page_cache(osd);
 757         while (cache) {
 758                 if (write) {
 759                         if (!osd->od_writethrough_cache) {
 760                                 cache = false;
 761                                 break;
 762                         }
 763                         if (iosize >= osd->od_writethrough_max_iosize) {
 764                                 cache = false;
 765                                 break;
 766                         }
 767                 } else {
 768                         if (!osd->od_read_cache) {
 769                                 cache = false;
 770                                 break;
 771                         }
 772                         if (iosize >= osd->od_readcache_max_iosize) {
 773                                 cache = false;
 774                                 break;
 775                         }
 776                 }
 777                 /* don't use cache on large files */
 778                 if (osd->od_readcache_max_filesize &&
 779                     fsize > osd->od_readcache_max_filesize)
 780                         cache = false;
 781                 break;
 782         }
 783
 784 bypass_checks:
 785         if (!cache && unlikely(!oti->oti_dio_pages)) {
 786                 OBD_ALLOC_PTR_ARRAY_LARGE(oti->oti_dio_pages,
 787                                           PTLRPC_MAX_BRW_PAGES);
 788                 if (!oti->oti_dio_pages)
 789                         return -ENOMEM;
 790         }
 791
 792         /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
 793         gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
 794                                              GFP_HIGHUSER;
 795         for (i = 0; i < npages; i++, lnb++) {
 796                 lnb->lnb_page = osd_get_page(env, dt, lnb->lnb_file_offset,
 797                                              gfp_mask, cache);
 798                 if (lnb->lnb_page == NULL)
 799                         GOTO(cleanup, rc = -ENOMEM);
 800
 801                 lnb->lnb_locked = 1;
 802                 if (cache)
 803                         mark_page_accessed(lnb->lnb_page);
 804         }
 805
 806 #if 0
 807         /* XXX: this version doesn't invalidate cached pages, but use them */
 808         if (!cache && write && obj->oo_inode->i_mapping->nrpages) {
 809                 /* do not allow data aliasing, invalidate pagecache */
 810                 /* XXX: can be quite expensive in mixed case */
 811                 invalidate_mapping_pages(obj->oo_inode->i_mapping,
 812                                 lnb[0].lnb_file_offset >> PAGE_SHIFT,
 813                                 lnb[npages - 1].lnb_file_offset >> PAGE_SHIFT);
 814         }
 815 #endif
 816
 817         RETURN(i);
 818
 819 cleanup:
 820         if (i > 0)
 821                 osd_bufs_put(env, dt, lnb - i, i);
 822         return rc;
 823 }
 824
 825 #ifdef HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS
 826 static int osd_extend_restart_trans(handle_t *handle, int needed,
 827                                     struct inode *inode)
 828 {
 829         int rc;
 830
 831         rc = ldiskfs_journal_ensure_credits(handle, needed,
 832                 ldiskfs_trans_default_revoke_credits(inode->i_sb));
 833         /* this means journal has been restarted */
 834         if (rc > 0)
 835                 rc = 0;
 836
 837         return rc;
 838 }
 839 #else
 840 static int osd_extend_restart_trans(handle_t *handle, int needed,
 841                                     struct inode *inode)
 842 {
 843         int rc;
 844
 845         if (ldiskfs_handle_has_enough_credits(handle, needed))
 846                 return 0;
 847         rc = ldiskfs_journal_extend(handle,
 848                                 needed - handle->h_buffer_credits);
 849         if (rc <= 0)
 850                 return rc;
 851
 852         return ldiskfs_journal_restart(handle, needed);
 853 }
 854 #endif /* HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS */
 855
 856 static int osd_ldiskfs_map_write(struct inode *inode, struct osd_iobuf *iobuf,
 857                                  struct osd_device *osd, sector_t start_blocks,
 858                                  sector_t count, loff_t *disk_size,
 859                                  __u64 user_size)
 860 {
 861         /* if file has grown, take user_size into account */
 862         if (user_size && *disk_size > user_size)
 863                 *disk_size = user_size;
 864
 865         spin_lock(&inode->i_lock);
 866         if (*disk_size > i_size_read(inode)) {
 867                 i_size_write(inode, *disk_size);
 868                 LDISKFS_I(inode)->i_disksize = *disk_size;
 869                 spin_unlock(&inode->i_lock);
 870                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
 871         } else {
 872                 spin_unlock(&inode->i_lock);
 873         }
 874
 875         /*
 876          * We don't do stats here as in read path because
 877          * write is async: we'll do this in osd_put_bufs()
 878          */
 879         return osd_do_bio(osd, inode, iobuf, start_blocks, count);
 880 }
 881
 882 static unsigned int osd_extent_bytes(const struct osd_device *o)
 883 {
 884         unsigned int *extent_bytes_ptr =
 885                         raw_cpu_ptr(o->od_extent_bytes_percpu);
 886
 887         if (likely(*extent_bytes_ptr))
 888                 return *extent_bytes_ptr;
 889
 890         /* initialize on first access or CPU hotplug */
 891         if (!ldiskfs_has_feature_extents(osd_sb(o)))
 892                 *extent_bytes_ptr = 1 << osd_sb(o)->s_blocksize_bits;
 893         else
 894                 *extent_bytes_ptr = OSD_DEFAULT_EXTENT_BYTES;
 895
 896         return *extent_bytes_ptr;
 897 }
 898
 899 #define EXTENT_BYTES_DECAY 64
 900 static void osd_decay_extent_bytes(struct osd_device *osd,
 901                                    unsigned int new_bytes)
 902 {
 903         unsigned int old_bytes;
 904
 905         if (!ldiskfs_has_feature_extents(osd_sb(osd)))
 906                 return;
 907
 908         old_bytes = osd_extent_bytes(osd);
 909         *raw_cpu_ptr(osd->od_extent_bytes_percpu) =
 910                 (old_bytes * (EXTENT_BYTES_DECAY - 1) +
 911                  min(new_bytes, OSD_DEFAULT_EXTENT_BYTES) +
 912                  EXTENT_BYTES_DECAY - 1) / EXTENT_BYTES_DECAY;
 913 }
 914
 915 static int osd_ldiskfs_map_inode_pages(struct inode *inode,
 916                                        struct osd_iobuf *iobuf,
 917                                        struct osd_device *osd,
 918                                        const int create,
 919                                        __u64 user_size,
 920                                        int check_credits,
 921                                        struct thandle *thandle)
 922 {
 923         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 924         int rc = 0, i = 0, mapped_index = 0;
 925         struct page *fp = NULL;
 926         int clen = 0;
 927         pgoff_t max_page_index;
 928         handle_t *handle = NULL;
 929         sector_t start_blocks = 0, count = 0;
 930         loff_t disk_size = 0;
 931         struct niobuf_local **lnbs = iobuf->dr_lnbs;
 932         int pages = iobuf->dr_npages;
 933         sector_t *blocks = iobuf->dr_blocks;
 934         struct niobuf_local *lnb1, *lnb2;
 935         loff_t size1, size2;
 936         bool compressed = false;
 937         int flags = 0;
 938
 939         max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
 940
 941         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 942                 inode->i_ino, pages, (*lnbs)->lnb_page->index);
 943
 944         if (osd->od_extents_dense)
 945                 compressed = iobuf->dr_lnbs[0]->lnb_flags & OBD_BRW_COMPRESSED;
 946
 947         if (create) {
 948                 flags = LDISKFS_GET_BLOCKS_CREATE;
 949                 handle = ldiskfs_journal_current_handle();
 950                 LASSERT(handle != NULL);
 951                 rc = osd_attach_jinode(inode);
 952                 if (rc)
 953                         return rc;
 954                 disk_size = i_size_read(inode);
 955                 /* if disk_size is already bigger than specified user_size,
 956                  * ignore user_size
 957                  */
 958                 if (disk_size > user_size)
 959                         user_size = 0;
 960         }
 961         /* pages are sorted already. so, we just have to find
 962          * contig. space and process them properly
 963          */
 964         while (i < pages) {
 965                 long blen, total = 0, previous_total = 0;
 966                 struct ldiskfs_map_blocks map = { 0 };
 967                 ktime_t time;
 968
 969                 if (fp == NULL) { /* start new extent */
 970                         fp = (*lnbs)->lnb_page;
 971                         lnbs++;
 972                         clen = 1;
 973                         iobuf->dr_lextents++;
 974                         if (++i != pages)
 975                                 continue;
 976                 } else if (fp->index + clen == (*lnbs)->lnb_page->index) {
 977                         /* continue the extent */
 978                         lnbs++;
 979                         clen++;
 980                         if (++i != pages)
 981                                 continue;
 982                 }
 983                 if (fp->index + clen >= max_page_index)
 984                         GOTO(cleanup, rc = -EFBIG);
 985                 /* process found extent */
 986                 map.m_lblk = fp->index * blocks_per_page;
 987                 map.m_len = blen = clen * blocks_per_page;
 988
 989                 /*
 990                  * Skip already written blocks of the start page.
 991                  * Note that this branch will not go into for 4K PAGE_SIZE.
 992                  * Because dr_start_pg_wblks is always 0 for 4K PAGE_SIZE.
 993                  * iobuf->dr_start_pg_wblks = (start_blocks + count) %
 994                  * blocks_per_page.
 995                  */
 996                 if (iobuf->dr_start_pg_wblks > 0) {
 997                         total = previous_total = start_blocks =
 998                                 iobuf->dr_start_pg_wblks;
 999                         map.m_lblk = fp->index * blocks_per_page +
1000                                 total;
1001                         map.m_len = blen - total;
1002                         iobuf->dr_start_pg_wblks = 0;
1003                 }
1004
1005 cont_map:
1006                 /**
1007                  * We might restart transaction for block allocations,
1008                  * in order to make sure data ordered mode, issue IO, disk
1009                  * size update and block allocations need be within same
1010                  * transaction to make sure consistency.
1011                  */
1012                 if (handle && check_credits) {
1013                         struct osd_thandle *oh;
1014
1015                         LASSERT(thandle != NULL);
1016                         oh = container_of(thandle, struct osd_thandle,
1017                                           ot_super);
1018                         /*
1019                          * only issue IO if restart transaction needed,
1020                          * as update disk size need hold inode lock, we
1021                          * want to avoid that as much as possible.
1022                          */
1023                         if (oh->oh_declared_ext <= 0) {
1024                                 rc = osd_ldiskfs_map_write(inode,
1025                                         iobuf, osd, start_blocks,
1026                                         count, &disk_size, user_size);
1027                                 if (rc)
1028                                         GOTO(cleanup, rc);
1029                                 thandle->th_restart_tran = 1;
1030                                 iobuf->dr_start_pg_wblks = (start_blocks +
1031                                                 count) % blocks_per_page;
1032                                 GOTO(cleanup, rc = -EAGAIN);
1033                         }
1034
1035                         if (CFS_FAIL_CHECK(OBD_FAIL_OST_RESTART_IO))
1036                                 oh->oh_declared_ext = 0;
1037                         else
1038                                 oh->oh_declared_ext--;
1039                 }
1040 #ifdef LDISKFS_GET_BLOCKS_VERY_DENSE
1041                 if (osd->od_extents_dense) {
1042                         if (CFS_FAIL_CHECK(OBD_FAIL_OSD_MARK_COMPRESSED))
1043                                 flags |= LDISKFS_GET_BLOCKS_VERY_DENSE;
1044                         if (compressed)
1045                                 flags |= LDISKFS_GET_BLOCKS_VERY_DENSE;
1046                 }
1047 #endif
1048
1049                 time = ktime_get();
1050                 rc = ldiskfs_map_blocks(handle, inode, &map, flags);
1051                 time = ktime_sub(ktime_get(), time);
1052
1053                 if (rc >= 0) {
1054                         struct brw_stats *h = &osd->od_brw_stats;
1055                         int idx, c = 0;
1056
1057                         iobuf->dr_pextents++;
1058
1059                         idx = map.m_flags & LDISKFS_MAP_NEW ?
1060                                 BRW_ALLOC_TIME : BRW_MAP_TIME;
1061                         lprocfs_oh_tally_log2_pcpu(&h->bs_hist[idx],
1062                                                    ktime_to_ms(time));
1063
1064                         for (; total < blen && c < map.m_len; c++, total++) {
1065                                 if (rc == 0) {
1066                                         *(blocks + total) = 0;
1067                                         total++;
1068                                         break;
1069                                 }
1070                                 if ((map.m_flags & LDISKFS_MAP_UNWRITTEN) &&
1071                                     !create) {
1072                                         /* don't try to read allocated, but
1073                                          * unwritten blocks, instead fill the
1074                                          * patches with zeros in osd_do_bio() */
1075                                         *(blocks + total) = 0;
1076                                         continue;
1077                                 }
1078                                 *(blocks + total) = map.m_pblk + c;
1079                                 /* unmap any possible underlying
1080                                  * metadata from the block device
1081                                  * mapping.  b=6998.
1082                                  */
1083                                 if ((map.m_flags & LDISKFS_MAP_NEW) &&
1084                                     create)
1085                                         clean_bdev_aliases(inode->i_sb->s_bdev,
1086                                                            map.m_pblk + c, 1);
1087                         }
1088                         rc = 0;
1089                 }
1090
1091                 if (rc == 0 && create) {
1092                         count += (total - previous_total);
1093                         mapped_index = (start_blocks + count + blocks_per_page -
1094                                         1) / blocks_per_page - 1;
1095                         lnb1 = iobuf->dr_lnbs[i - clen];
1096                         lnb2 = iobuf->dr_lnbs[mapped_index];
1097                         size1 = lnb1->lnb_file_offset -
1098                                 (lnb1->lnb_file_offset % PAGE_SIZE) +
1099                                 (total << inode->i_blkbits);
1100                         size2 = lnb2->lnb_file_offset + lnb2->lnb_len;
1101
1102                         if (size1 > size2)
1103                                 size1 = size2;
1104                         if (size1 > disk_size)
1105                                 disk_size = size1;
1106                 }
1107
1108                 if (rc == 0 && total < blen) {
1109                         /*
1110                          * decay extent blocks if we could not
1111                          * allocate extent once.
1112                          */
1113                         osd_decay_extent_bytes(osd,
1114                                 (total - previous_total) << inode->i_blkbits);
1115                         map.m_lblk = fp->index * blocks_per_page + total;
1116                         map.m_len = blen - total;
1117                         previous_total = total;
1118                         goto cont_map;
1119                 }
1120                 if (rc != 0)
1121                         GOTO(cleanup, rc);
1122                 /*
1123                  * decay extent blocks if we could allocate
1124                  * good large extent.
1125                  */
1126                 if (total - previous_total >=
1127                     osd_extent_bytes(osd) >> inode->i_blkbits)
1128                         osd_decay_extent_bytes(osd,
1129                                 (total - previous_total) << inode->i_blkbits);
1130                 /* look for next extent */
1131                 fp = NULL;
1132                 blocks += blocks_per_page * clen;
1133         }
1134 cleanup:
1135         if (rc == 0 && create &&
1136             start_blocks < pages * blocks_per_page) {
1137                 rc = osd_ldiskfs_map_write(inode, iobuf, osd, start_blocks,
1138                                            count, &disk_size, user_size);
1139                 LASSERT(start_blocks + count == pages * blocks_per_page);
1140         }
1141         return rc;
1142 }
1143
1144 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
1145                           struct niobuf_local *lnb, int npages)
1146 {
1147         struct osd_thread_info *oti   = osd_oti_get(env);
1148         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
1149         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
1150         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
1151         ktime_t start, end;
1152         s64 timediff;
1153         ssize_t isize;
1154         __s64  maxidx;
1155         int i, rc = 0;
1156
1157         LASSERT(inode);
1158
1159         rc = osd_init_iobuf(osd, iobuf, inode, 0, npages);
1160         if (unlikely(rc != 0))
1161                 RETURN(rc);
1162
1163         isize = i_size_read(inode);
1164         maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1165
1166         start = ktime_get();
1167         for (i = 0; i < npages; i++) {
1168
1169                 /*
1170                  * till commit the content of the page is undefined
1171                  * we'll set it uptodate once bulk is done. otherwise
1172                  * subsequent reads can access non-stable data
1173                  */
1174                 ClearPageUptodate(lnb[i].lnb_page);
1175
1176                 if (lnb[i].lnb_len == PAGE_SIZE)
1177                         continue;
1178
1179                 if (maxidx >= lnb[i].lnb_page->index) {
1180                         osd_iobuf_add_page(iobuf, &lnb[i]);
1181                 } else {
1182                         long off;
1183                         char *p = kmap(lnb[i].lnb_page);
1184
1185                         off = lnb[i].lnb_page_offset;
1186                         if (off)
1187                                 memset(p, 0, off);
1188                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1189                               ~PAGE_MASK;
1190                         if (off)
1191                                 memset(p + off, 0, PAGE_SIZE - off);
1192                         kunmap(lnb[i].lnb_page);
1193                 }
1194         }
1195         end = ktime_get();
1196         timediff = ktime_us_delta(end, start);
1197         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1198
1199         if (iobuf->dr_npages) {
1200                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1201                                                  0, 0, NULL);
1202                 if (likely(rc == 0)) {
1203                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1204                         /* do IO stats for preparation reads */
1205                         osd_fini_iobuf(osd, iobuf);
1206                 }
1207         }
1208         RETURN(rc);
1209 }
1210
1211 #ifdef KERNEL_DS
1212 #define DECLARE_MM_SEGMENT_T(name)             mm_segment_t name
1213 #define access_set_kernel(saved_fs, fei)                                \
1214 do {                                                                    \
1215         saved_fs = get_fs();                                            \
1216         set_fs(KERNEL_DS);                                              \
1217 } while (0)
1218 #define access_unset_kernel(saved_fs, fei)             set_fs((saved_fs))
1219 #else
1220 #define DECLARE_MM_SEGMENT_T(name)
1221 #define access_set_kernel(saved_fs, fei)                                \
1222         (fei)->fi_flags |= LDISKFS_FIEMAP_FLAG_MEMCPY
1223 #define access_unset_kernel(saved_fs, fei) \
1224         (fei)->fi_flags &= ~(LDISKFS_FIEMAP_FLAG_MEMCPY)
1225 #endif /* KERNEL_DS */
1226
1227 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1228                          struct ldiskfs_map_blocks *map)
1229 {
1230         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1231         int mapped;
1232         sector_t block = osd_i_blocks(inode, offset);
1233         sector_t end;
1234
1235         if (i_size_read(inode) == 0)
1236                 return 0;
1237
1238         /* Beyond EOF, must not be mapped */
1239         if ((i_size_read(inode) - 1) < offset)
1240                 return 0;
1241
1242         end = map->m_lblk + map->m_len;
1243         if (block >= map->m_lblk && block < end)
1244                 return map->m_flags & LDISKFS_MAP_MAPPED;
1245
1246         map->m_lblk = block;
1247         map->m_len = INT_MAX;
1248
1249         mapped = ldiskfs_map_blocks(NULL, inode, map, 0);
1250         if (mapped < 0) {
1251                 map->m_len = 0;
1252                 return 0;
1253         }
1254
1255         return map->m_flags & LDISKFS_MAP_MAPPED;
1256 }
1257
1258 #define MAX_EXTENTS_PER_WRITE 100
1259 static int osd_declare_write_commit(const struct lu_env *env,
1260                                     struct dt_object *dt,
1261                                     struct niobuf_local *lnb, int npages,
1262                                     struct thandle *handle)
1263 {
1264         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1265         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1266         struct osd_thandle      *oh;
1267         int                     extents = 0, new_meta = 0;
1268         int                     depth, new_blocks = 0;
1269         int                     i;
1270         int                     dirty_groups = 0;
1271         int                     rc = 0;
1272         int                     credits = 0;
1273         long long               quota_space = 0;
1274         struct ldiskfs_map_blocks map;
1275         enum osd_quota_local_flags local_flags = 0;
1276         enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1277         unsigned int            extent_bytes;
1278         loff_t extent_start = 0;
1279         loff_t extent_end = 0;
1280         ENTRY;
1281
1282         LASSERT(handle != NULL);
1283         oh = container_of(handle, struct osd_thandle, ot_super);
1284         LASSERT(oh->ot_handle == NULL);
1285
1286         /*
1287          * We track a decaying average extent blocks per filesystem,
1288          * for most of time, it will be 1M, with filesystem becoming
1289          * heavily-fragmented, it will be reduced to 4K at the worst.
1290          */
1291         extent_bytes = osd_extent_bytes(osd);
1292         LASSERT(extent_bytes >= osd_sb(osd)->s_blocksize);
1293
1294         /* calculate number of extents (probably better to pass nb) */
1295         for (i = 0; i < npages; i++) {
1296                 /* ignore quota for the whole request if any page is from
1297                  * client cache or written by root.
1298                  *
1299                  * XXX we could handle this on per-lnb basis as done by
1300                  * grant.
1301                  */
1302                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1303                     (lnb[i].lnb_flags & OBD_BRW_SYS_RESOURCE) ||
1304                     !(lnb[i].lnb_flags & OBD_BRW_SYNC))
1305                         declare_flags |= OSD_QID_FORCE;
1306
1307                 /*
1308                  * Convert unwritten extent might need split extents, could
1309                  * not skip it.
1310                  */
1311                 if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &map) &&
1312                     !(map.m_flags & LDISKFS_MAP_UNWRITTEN)) {
1313                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1314                         continue;
1315                 }
1316
1317                 if (lnb[i].lnb_flags & OBD_BRW_DONE) {
1318                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1319                         continue;
1320                 }
1321
1322                 /* count only unmapped changes */
1323                 new_blocks++;
1324                 if (lnb[i].lnb_file_offset != extent_end || extent_end == 0) {
1325                         if (extent_end != 0)
1326                                 extents += (extent_end - extent_start +
1327                                             extent_bytes - 1) / extent_bytes;
1328                         extent_start = lnb[i].lnb_file_offset;
1329                         extent_end = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1330                 } else {
1331                         extent_end += lnb[i].lnb_len;
1332                 }
1333
1334                 quota_space += PAGE_SIZE;
1335         }
1336
1337         credits++; /* inode */
1338         /*
1339          * overwrite case, no need to modify tree and
1340          * allocate blocks.
1341          */
1342         if (!extent_end)
1343                 goto out_declare;
1344
1345         extents += (extent_end - extent_start +
1346                     extent_bytes - 1) / extent_bytes;
1347         /**
1348          * with system space usage growing up, mballoc codes won't
1349          * try best to scan block group to align best free extent as
1350          * we can. So extent bytes per extent could be decayed to a
1351          * very small value, this could make us reserve too many credits.
1352          * We could be more optimistic in the credit reservations, even
1353          * in a case where the filesystem is nearly full, it is extremely
1354          * unlikely that the worst case would ever be hit.
1355          */
1356         if (extents > MAX_EXTENTS_PER_WRITE)
1357                 extents = MAX_EXTENTS_PER_WRITE;
1358
1359         /**
1360          * If we add a single extent, then in the worse case, each tree
1361          * level index/leaf need to be changed in case of the tree split.
1362          * If more extents are inserted, they could cause the whole tree
1363          * split more than once, but this is really rare.
1364          */
1365         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1366                 /*
1367                  * many concurrent threads may grow tree by the time
1368                  * our transaction starts. so, consider 2 is a min depth.
1369                  */
1370                 depth = ext_depth(inode);
1371                 depth = min(max(depth, 1) + 1, LDISKFS_MAX_EXTENT_DEPTH);
1372                 if (extents <= 1) {
1373                         credits += depth * 2 * extents;
1374                         new_meta = depth;
1375                 } else {
1376                         credits += depth * 3 * extents;
1377                         new_meta = depth * 2 * extents;
1378                 }
1379         } else {
1380                 /*
1381                  * With N contiguous data blocks, we need at most
1382                  * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks,
1383                  * 2 dindirect blocks, and 1 tindirect block
1384                  */
1385                 new_meta = DIV_ROUND_UP(new_blocks,
1386                                 LDISKFS_ADDR_PER_BLOCK(inode->i_sb)) + 4;
1387                 credits += new_meta;
1388         }
1389         dirty_groups += (extents + new_meta);
1390
1391         oh->oh_declared_ext = extents;
1392
1393         /* quota space for metadata blocks */
1394         quota_space += new_meta * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1395
1396         /* quota space should be reported in 1K blocks */
1397         quota_space = toqb(quota_space);
1398
1399         /* each new block can go in different group (bitmap + gd) */
1400
1401         /* we can't dirty more bitmap blocks than exist */
1402         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1403                 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1404         else
1405                 credits += dirty_groups;
1406
1407         /* we can't dirty more gd blocks than exist */
1408         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1409                 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1410         else
1411                 credits += dirty_groups;
1412
1413         CDEBUG(D_INODE,
1414                "%s: inode #%lu extent_bytes %u extents %d credits %d\n",
1415                osd_ino2name(inode), inode->i_ino, extent_bytes, extents,
1416                credits);
1417
1418 out_declare:
1419         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1420
1421         /* make sure the over quota flags were not set */
1422         lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1423
1424         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1425                                    i_projid_read(inode), quota_space, oh,
1426                                    osd_dt_obj(dt), &local_flags, declare_flags);
1427
1428         /* we need only to store the overquota flags in the first lnb for
1429          * now, once we support multiple objects BRW, this code needs be
1430          * revised.
1431          */
1432         if (local_flags & QUOTA_FL_OVER_USRQUOTA)
1433                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1434         if (local_flags & QUOTA_FL_OVER_GRPQUOTA)
1435                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1436         if (local_flags & QUOTA_FL_OVER_PRJQUOTA)
1437                 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1438         if (local_flags & QUOTA_FL_ROOT_PRJQUOTA)
1439                 lnb[0].lnb_flags |= OBD_BRW_ROOT_PRJQUOTA;
1440
1441         if (rc == 0)
1442                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, true);
1443
1444         RETURN(rc);
1445 }
1446
1447 /* Check if a block is allocated or not */
1448 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1449                             struct niobuf_local *lnb, int npages,
1450                             struct thandle *thandle, __u64 user_size)
1451 {
1452         struct osd_thread_info *oti = osd_oti_get(env);
1453         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1454         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1455         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1456         int rc = 0, i, check_credits = 0;
1457
1458         LASSERT(inode);
1459
1460         rc = osd_init_iobuf(osd, iobuf, inode, 1, npages);
1461         if (unlikely(rc != 0))
1462                 RETURN(rc);
1463
1464         dquot_initialize(inode);
1465
1466         for (i = 0; i < npages; i++) {
1467                 if (lnb[i].lnb_rc == -ENOSPC &&
1468                     (lnb[i].lnb_flags & OBD_BRW_MAPPED)) {
1469                         /* Allow the write to proceed if overwriting an
1470                          * existing block
1471                          */
1472                         lnb[i].lnb_rc = 0;
1473                 }
1474
1475                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1476                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1477                                lnb[i].lnb_rc);
1478                         LASSERT(lnb[i].lnb_page);
1479                         generic_error_remove_folio(inode->i_mapping,
1480                                                    page_folio(lnb[i].lnb_page));
1481                         continue;
1482                 }
1483
1484                 if (lnb[i].lnb_flags & OBD_BRW_DONE)
1485                         continue;
1486
1487                 if (!(lnb[i].lnb_flags & OBD_BRW_MAPPED))
1488                         check_credits = 1;
1489
1490                 LASSERT(PageLocked(lnb[i].lnb_page));
1491                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1492
1493                 /*
1494                  * Since write and truncate are serialized by oo_sem, even
1495                  * partial-page truncate should not leave dirty pages in the
1496                  * page cache.
1497                  */
1498                 LASSERT(!PageDirty(lnb[i].lnb_page));
1499
1500                 SetPageUptodate(lnb[i].lnb_page);
1501
1502                 osd_iobuf_add_page(iobuf, &lnb[i]);
1503         }
1504
1505         osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1506
1507         if (CFS_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1508                 rc = -ENOSPC;
1509         } else if (iobuf->dr_npages > 0) {
1510                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd,
1511                                                  1, user_size,
1512                                                  check_credits,
1513                                                  thandle);
1514         } else {
1515                 /* no pages to write, no transno is needed */
1516                 thandle->th_local = 1;
1517         }
1518
1519         if (rc != 0 && !thandle->th_restart_tran)
1520                 osd_fini_iobuf(osd, iobuf);
1521
1522         osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1523
1524         if (unlikely(rc != 0 && !thandle->th_restart_tran)) {
1525                 /* if write fails, we should drop pages from the cache */
1526                 for (i = 0; i < npages; i++) {
1527                         if (lnb[i].lnb_page == NULL)
1528                                 continue;
1529                         if (!PagePrivate2(lnb[i].lnb_page)) {
1530                                 LASSERT(PageLocked(lnb[i].lnb_page));
1531                                 generic_error_remove_folio(inode->i_mapping,
1532                                                 page_folio(lnb[i].lnb_page));
1533                         }
1534                 }
1535         }
1536
1537         RETURN(rc);
1538 }
1539
1540 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1541                          struct niobuf_local *lnb, int npages)
1542 {
1543         struct osd_thread_info *oti = osd_oti_get(env);
1544         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1545         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1546         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1547         int rc = 0, i, cache_hits = 0, cache_misses = 0;
1548         ktime_t start, end;
1549         s64 timediff;
1550         loff_t isize;
1551
1552         LASSERT(inode);
1553
1554         rc = osd_init_iobuf(osd, iobuf, inode, 0, npages);
1555         if (unlikely(rc != 0))
1556                 RETURN(rc);
1557
1558         isize = i_size_read(inode);
1559
1560         start = ktime_get();
1561         for (i = 0; i < npages; i++) {
1562
1563                 if (isize <= lnb[i].lnb_file_offset)
1564                         /* If there's no more data, abort early.
1565                          * lnb->lnb_rc == 0, so it's easy to detect later.
1566                          */
1567                         break;
1568
1569                 /* instead of looking if we go beyong isize, send complete
1570                  * pages all the time
1571                  */
1572                 lnb[i].lnb_rc = lnb[i].lnb_len;
1573
1574                 /* Bypass disk read if fail_loc is set properly */
1575                 if (CFS_FAIL_CHECK_QUIET(OBD_FAIL_OST_FAKE_RW))
1576                         SetPageUptodate(lnb[i].lnb_page);
1577
1578                 if (PageUptodate(lnb[i].lnb_page)) {
1579                         cache_hits++;
1580                         unlock_page(lnb[i].lnb_page);
1581                 } else {
1582                         cache_misses++;
1583                         osd_iobuf_add_page(iobuf, &lnb[i]);
1584                 }
1585                 /* no need to unlock in osd_bufs_put(), the sooner page is
1586                  * unlocked, the earlier another client can access it.
1587                  * notice real unlock_page() can be called few lines
1588                  * below after osd_do_bio(). lnb is a per-thread, so it's
1589                  * fine to have PG_locked and lnb_locked inconsistent here
1590                  */
1591                 lnb[i].lnb_locked = 0;
1592         }
1593         end = ktime_get();
1594         timediff = ktime_us_delta(end, start);
1595         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1596
1597         if (cache_hits != 0)
1598                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1599                                     cache_hits);
1600         if (cache_misses != 0)
1601                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1602                                     cache_misses);
1603         if (cache_hits + cache_misses != 0)
1604                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1605                                     cache_hits + cache_misses);
1606
1607         if (iobuf->dr_npages) {
1608                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1609                                                  0, 0, NULL);
1610                 if (!rc)
1611                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1612
1613                 /* IO stats will be done in osd_bufs_put() */
1614
1615                 /* early release to let others read data during the bulk */
1616                 for (i = 0; i < iobuf->dr_npages; i++) {
1617                         struct page *page = iobuf->dr_lnbs[i]->lnb_page;
1618                         LASSERT(PageLocked(page));
1619                         if (!PagePrivate2(page))
1620                                 unlock_page(page);
1621                 }
1622         }
1623
1624         RETURN(rc);
1625 }
1626
1627 /*
1628  * XXX: Another layering violation for now.
1629  *
1630  * We don't want to use ->f_op->read methods, because generic file write
1631  *
1632  *         - serializes on ->i_sem, and
1633  *
1634  *         - does a lot of extra work like balance_dirty_pages(),
1635  *
1636  * which doesn't work for globally shared files like /last_rcvd.
1637  */
1638 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1639 {
1640         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1641
1642         memcpy(buffer, (char *)ei->i_data, buflen);
1643
1644         return  buflen;
1645 }
1646
1647 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1648 {
1649         struct buffer_head *bh;
1650         unsigned long block;
1651         int osize;
1652         int blocksize;
1653         int csize;
1654         int boffs;
1655
1656         /* prevent reading after eof */
1657         spin_lock(&inode->i_lock);
1658         if (i_size_read(inode) < *offs + size) {
1659                 loff_t diff = i_size_read(inode) - *offs;
1660
1661                 spin_unlock(&inode->i_lock);
1662                 if (diff < 0) {
1663                         CDEBUG(D_OTHER,
1664                                "size %llu is too short to read @%llu\n",
1665                                i_size_read(inode), *offs);
1666                         return -EBADR;
1667                 } else if (diff == 0) {
1668                         return 0;
1669                 } else {
1670                         size = diff;
1671                 }
1672         } else {
1673                 spin_unlock(&inode->i_lock);
1674         }
1675
1676         blocksize = 1 << inode->i_blkbits;
1677         osize = size;
1678         while (size > 0) {
1679                 block = *offs >> inode->i_blkbits;
1680                 boffs = *offs & (blocksize - 1);
1681                 csize = min(blocksize - boffs, size);
1682                 bh = __ldiskfs_bread(NULL, inode, block, 0);
1683                 if (IS_ERR(bh)) {
1684                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1685                                osd_ino2name(inode), csize, *offs, inode->i_ino,
1686                                PTR_ERR(bh));
1687                         return PTR_ERR(bh);
1688                 }
1689
1690                 if (bh != NULL) {
1691                         memcpy(buf, bh->b_data + boffs, csize);
1692                         brelse(bh);
1693                 } else {
1694                         memset(buf, 0, csize);
1695                 }
1696
1697                 *offs += csize;
1698                 buf += csize;
1699                 size -= csize;
1700         }
1701         return osize;
1702 }
1703
1704 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1705                         struct lu_buf *buf, loff_t *pos)
1706 {
1707         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1708         int rc;
1709
1710         /* Read small symlink from inode body as we need to maintain correct
1711          * on-disk symlinks for ldiskfs.
1712          */
1713         if (S_ISLNK(dt->do_lu.lo_header->loh_attr)) {
1714                 loff_t size = i_size_read(inode);
1715
1716                 if (buf->lb_len < size)
1717                         return -EOVERFLOW;
1718
1719                 if (size < sizeof(LDISKFS_I(inode)->i_data))
1720                         rc = osd_ldiskfs_readlink(inode, buf->lb_buf, size);
1721                 else
1722                         rc = osd_ldiskfs_read(inode, buf->lb_buf, size, pos);
1723         } else {
1724                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1725         }
1726
1727         return rc;
1728 }
1729
1730 static inline int osd_extents_enabled(struct super_block *sb,
1731                                       struct inode *inode)
1732 {
1733         if (inode != NULL) {
1734                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1735                         return 1;
1736         } else if (ldiskfs_has_feature_extents(sb)) {
1737                 return 1;
1738         }
1739         return 0;
1740 }
1741
1742 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1743                            const loff_t size, const loff_t pos,
1744                            const int blocks)
1745 {
1746         int credits, bits, bs, i;
1747
1748         bits = sb->s_blocksize_bits;
1749         bs = 1 << bits;
1750
1751         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1752          * we do not expect blockmaps on the large files,
1753          * so let's shrink it to 2 levels (4GB files)
1754          */
1755
1756         /* this is default reservation: 2 levels */
1757         credits = (blocks + 2) * 3;
1758
1759         /* actual offset is unknown, hard to optimize */
1760         if (pos == -1)
1761                 return credits;
1762
1763         /* now check for few specific cases to optimize */
1764         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1765                 /* no indirects */
1766                 credits = blocks;
1767                 /* allocate if not allocated */
1768                 if (inode == NULL) {
1769                         credits += blocks * 2;
1770                         return credits;
1771                 }
1772                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1773                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1774                         if (LDISKFS_I(inode)->i_data[i] == 0)
1775                                 credits += 2;
1776                 }
1777         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1778                 /* single indirect */
1779                 credits = blocks * 3;
1780                 if (inode == NULL ||
1781                     LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1782                         credits += 3;
1783                 else
1784                         /* The indirect block may be modified. */
1785                         credits += 1;
1786         }
1787
1788         return credits;
1789 }
1790
1791 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1792                                  const struct lu_buf *buf, loff_t _pos,
1793                                  struct thandle *handle)
1794 {
1795         struct osd_object  *obj  = osd_dt_obj(dt);
1796         struct inode       *inode = obj->oo_inode;
1797         struct super_block *sb = osd_sb(osd_obj2dev(obj));
1798         struct osd_thandle *oh;
1799         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
1800         int                 bits, bs;
1801         int                 depth, size;
1802         loff_t              pos;
1803         ENTRY;
1804
1805         LASSERT(buf != NULL);
1806         LASSERT(handle != NULL);
1807
1808         oh = container_of(handle, struct osd_thandle, ot_super);
1809         LASSERT(oh->ot_handle == NULL);
1810
1811         size = buf->lb_len;
1812         bits = sb->s_blocksize_bits;
1813         bs = 1 << bits;
1814
1815         if (osd_tx_was_declared(env, oh, dt, DTO_WRITE_BASE, _pos))
1816                 RETURN(0);
1817
1818         if (_pos == -1) {
1819                 /* if this is an append, then we
1820                  * should expect cross-block record
1821                  */
1822                 pos = 0;
1823         } else {
1824                 pos = _pos;
1825         }
1826
1827         /* blocks to modify */
1828         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1829         LASSERT(blocks > 0);
1830
1831         if (inode != NULL && _pos != -1) {
1832                 /* object size in blocks */
1833                 est = (i_size_read(inode) + bs - 1) >> bits;
1834                 allocated = inode->i_blocks >> (bits - 9);
1835                 if (pos + size <= i_size_read(inode) && est <= allocated) {
1836                         /* looks like an overwrite, no need to modify tree */
1837                         credits = blocks;
1838                         /* no need to modify i_size */
1839                         goto out;
1840                 }
1841         }
1842
1843         if (osd_extents_enabled(sb, inode)) {
1844                 /*
1845                  * many concurrent threads may grow tree by the time
1846                  * our transaction starts. so, consider 2 is a min depth
1847                  * for every level we may need to allocate a new block
1848                  * and take some entries from the old one. so, 3 blocks
1849                  * to allocate (bitmap, gd, itself) + old block - 4 per
1850                  * level.
1851                  */
1852                 depth = inode != NULL ? ext_depth(inode) : 0;
1853                 depth = min(max(depth, 1) + 3, LDISKFS_MAX_EXTENT_DEPTH);
1854                 credits = depth;
1855                 /* if not append, then split may need to modify
1856                  * existing blocks moving entries into the new ones
1857                  */
1858                 if (_pos != -1)
1859                         credits += depth;
1860                 /* blocks to store data: bitmap,gd,itself */
1861                 credits += blocks * 3;
1862         } else {
1863                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1864         }
1865         /* if inode is created as part of the transaction,
1866          * then it's counted already by the creation method
1867          */
1868         if (inode != NULL)
1869                 credits++;
1870
1871 out:
1872
1873         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1874
1875         /* dt_declare_write() is usually called for system objects, such
1876          * as llog or last_rcvd files. We needn't enforce quota on those
1877          * objects, so always set the lqi_space as 0.
1878          */
1879         if (inode != NULL)
1880                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1881                                            i_gid_read(inode),
1882                                            i_projid_read(inode), 0,
1883                                            oh, obj, NULL, OSD_QID_BLK);
1884
1885         if (rc == 0)
1886                 rc = osd_trunc_lock(obj, oh, true);
1887
1888         RETURN(rc);
1889 }
1890
1891 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1892 {
1893         /* LU-2634: clear the extent format for fast symlink */
1894         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1895
1896         /* Copying the NUL byte terminating the link target as well */
1897         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen + 1);
1898         spin_lock(&inode->i_lock);
1899         LDISKFS_I(inode)->i_disksize = buflen;
1900         i_size_write(inode, buflen);
1901         spin_unlock(&inode->i_lock);
1902         osd_dirty_inode(inode, I_DIRTY_DATASYNC);
1903
1904         return 0;
1905 }
1906
1907 static int osd_ldiskfs_write_record(struct dt_object *dt, void *buf,
1908                                     int bufsize, int write_NUL, loff_t *offs,
1909                                     handle_t *handle)
1910 {
1911         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1912         struct buffer_head *bh        = NULL;
1913         loff_t              offset    = *offs;
1914         loff_t              new_size  = i_size_read(inode);
1915         unsigned long       block;
1916         int                 blocksize = 1 << inode->i_blkbits;
1917         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1918         int                 err = 0;
1919         int                 size;
1920         int                 boffs;
1921         int                 dirty_inode = 0;
1922         bool create, sparse, sync = false;
1923
1924         if (write_NUL) {
1925                 /*
1926                  * long symlink write does not count the NUL terminator in
1927                  * bufsize, we write it, and the inode's file size does not
1928                  * count the NUL terminator as well.
1929                  */
1930                 ((char *)buf)[bufsize] = '\0';
1931                 ++bufsize;
1932         }
1933
1934         /* only the first flag-set matters */
1935         dirty_inode = !test_and_set_bit(LDISKFS_INODE_JOURNAL_DATA,
1936                                        &ei->i_flags);
1937
1938         /* sparse checking is racy, but sparse is very rare case, leave as is */
1939         sparse = (new_size > 0 && (inode->i_blocks >> (inode->i_blkbits - 9)) <
1940                   ((new_size - 1) >> inode->i_blkbits) + 1);
1941
1942         while (bufsize > 0) {
1943                 int credits = handle->h_buffer_credits;
1944                 unsigned long last_block = (new_size == 0) ? 0 :
1945                                            (new_size - 1) >> inode->i_blkbits;
1946
1947                 if (bh)
1948                         brelse(bh);
1949
1950                 block = offset >> inode->i_blkbits;
1951                 boffs = offset & (blocksize - 1);
1952                 size = min(blocksize - boffs, bufsize);
1953                 sync = (block > last_block || new_size == 0 || sparse);
1954
1955                 if (sync)
1956                         down(&ei->i_append_sem);
1957
1958                 bh = __ldiskfs_bread(handle, inode, block, 0);
1959
1960                 if (unlikely(IS_ERR_OR_NULL(bh) && !sync))
1961                         CWARN(
1962                               "%s: adding bh without locking off %llu (block %lu, size %d, offs %llu)\n",
1963                               osd_ino2name(inode),
1964                               offset, block, bufsize, *offs);
1965
1966                 if (IS_ERR_OR_NULL(bh)) {
1967                         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1968                         int flags = LDISKFS_GET_BLOCKS_CREATE;
1969
1970                         /* while the file system is being mounted, avoid
1971                          * preallocation otherwise mount can take a long
1972                          * time as mballoc cache is cold.
1973                          * XXX: this is a workaround until we have a proper
1974                          *      fix in mballoc
1975                          * XXX: works with extent-based files only */
1976                         if (!osd->od_cl_seq)
1977                                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
1978                         bh = __ldiskfs_bread(handle, inode, block, flags);
1979                         create = true;
1980                 } else {
1981                         if (sync) {
1982                                 up(&ei->i_append_sem);
1983                                 sync = false;
1984                         }
1985                         create = false;
1986                 }
1987                 if (IS_ERR_OR_NULL(bh)) {
1988                         if (bh == NULL) {
1989                                 err = -EIO;
1990                         } else {
1991                                 err = PTR_ERR(bh);
1992                                 bh = NULL;
1993                         }
1994
1995                         CERROR(
1996                                "%s: error reading offset %llu (block %lu, size %d, offs %llu), credits %d/%d: rc = %d\n",
1997                                osd_ino2name(inode), offset, block, bufsize,
1998                                *offs, credits, handle->h_buffer_credits, err);
1999                         break;
2000                 }
2001
2002                 err = osd_ldiskfs_journal_get_write_access(handle, inode->i_sb,
2003                                                            bh,
2004                                                            LDISKFS_JTR_NONE);
2005                 if (err) {
2006                         CERROR("journal_get_write_access() returned error %d\n",
2007                                err);
2008                         break;
2009                 }
2010                 LASSERTF(boffs + size <= bh->b_size,
2011                          "boffs %d size %d bh->b_size %lu\n",
2012                          boffs, size, (unsigned long)bh->b_size);
2013                 if (create) {
2014                         memset(bh->b_data, 0, bh->b_size);
2015                         if (sync) {
2016                                 up(&ei->i_append_sem);
2017                                 sync = false;
2018                         }
2019                 }
2020                 memcpy(bh->b_data + boffs, buf, size);
2021                 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
2022                 if (err)
2023                         break;
2024
2025                 if (offset + size > new_size)
2026                         new_size = offset + size;
2027                 offset += size;
2028                 bufsize -= size;
2029                 buf += size;
2030         }
2031         if (sync)
2032                 up(&ei->i_append_sem);
2033
2034         if (bh)
2035                 brelse(bh);
2036
2037         if (write_NUL)
2038                 --new_size;
2039         /* correct in-core and on-disk sizes */
2040         if (new_size > i_size_read(inode)) {
2041                 spin_lock(&inode->i_lock);
2042                 if (new_size > i_size_read(inode))
2043                         i_size_write(inode, new_size);
2044                 if (i_size_read(inode) > ei->i_disksize) {
2045                         ei->i_disksize = i_size_read(inode);
2046                         dirty_inode = 1;
2047                 }
2048                 spin_unlock(&inode->i_lock);
2049         }
2050         if (dirty_inode)
2051                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2052
2053         if (err == 0)
2054                 *offs = offset;
2055         return err;
2056 }
2057
2058 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
2059                          const struct lu_buf *buf, loff_t *pos,
2060                          struct thandle *handle)
2061 {
2062         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
2063         struct osd_thandle      *oh;
2064         ssize_t                 result;
2065         int                     is_link;
2066
2067         LASSERT(dt_object_exists(dt));
2068
2069         LASSERT(handle != NULL);
2070         LASSERT(inode != NULL);
2071         dquot_initialize(inode);
2072
2073         /* XXX: don't check: one declared chunk can be used many times */
2074         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
2075
2076         oh = container_of(handle, struct osd_thandle, ot_super);
2077         LASSERT(oh->ot_handle->h_transaction != NULL);
2078         osd_trans_exec_op(env, handle, OSD_OT_WRITE);
2079
2080         /* Write small symlink to inode body as we need to maintain correct
2081          * on-disk symlinks for ldiskfs.
2082          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
2083          * does not count it in.
2084          */
2085         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
2086         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
2087                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
2088         else
2089                 result = osd_ldiskfs_write_record(dt, buf->lb_buf, buf->lb_len,
2090                                                   is_link, pos, oh->ot_handle);
2091         if (result == 0)
2092                 result = buf->lb_len;
2093
2094         osd_trans_exec_check(env, handle, OSD_OT_WRITE);
2095
2096         return result;
2097 }
2098
2099 static int osd_declare_fallocate(const struct lu_env *env,
2100                                  struct dt_object *dt, __u64 start, __u64 end,
2101                                  int mode, struct thandle *th)
2102 {
2103         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2104         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2105         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2106         long long quota_space = 0;
2107         /* 5 is max tree depth. (inode + 4 index blocks) */
2108         int depth = 5;
2109         int rc;
2110
2111         ENTRY;
2112
2113         /*
2114          * mode == 0 (which is standard prealloc) and PUNCH is supported
2115          * Rest of mode options is not supported yet.
2116          */
2117         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2118                 RETURN(-EOPNOTSUPP);
2119
2120         /* disable fallocate completely */
2121         if (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks < 0)
2122                 RETURN(-EOPNOTSUPP);
2123
2124         LASSERT(th);
2125         LASSERT(inode);
2126
2127         if ((mode & FALLOC_FL_PUNCH_HOLE) == 0) {
2128                 /* quota space for metadata blocks
2129                  * approximate metadata estimate should be good enough.
2130                  */
2131                 quota_space += PAGE_SIZE;
2132                 quota_space += depth * LDISKFS_BLOCK_SIZE(osd_sb(osd));
2133
2134                 /* quota space should be reported in 1K blocks */
2135                 quota_space = toqb(quota_space) + toqb(end - start) +
2136                         LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
2137
2138                 /*
2139                  * We don't need to reserve credits for whole fallocate here.
2140                  * We reserve space only for metadata. Fallocate credits are
2141                  * extended as required
2142                  */
2143         }
2144         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2145                                    i_projid_read(inode), quota_space, oh,
2146                                    osd_dt_obj(dt), NULL, OSD_QID_BLK);
2147         if (rc)
2148                 RETURN(rc);
2149
2150         /*
2151          * The both hole punch and allocation may need few transactions
2152          * to complete, so we have to avoid concurrent writes/truncates
2153          * as we can't release object lock from within ldiskfs.
2154          * Notice locking order: transaction start, then lock object
2155          * (don't confuse object lock dt_{read|write}_lock() with the
2156          * trunc lock.
2157          */
2158         rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
2159
2160         RETURN(rc);
2161 }
2162
2163 static int osd_fallocate_preallocate(const struct lu_env *env,
2164                                      struct dt_object *dt,
2165                                      __u64 start, __u64 end, int mode,
2166                                      struct thandle *th)
2167 {
2168         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2169         handle_t *handle = ldiskfs_journal_current_handle();
2170         unsigned int save_credits = oh->ot_credits;
2171         struct osd_object *obj = osd_dt_obj(dt);
2172         struct inode *inode = obj->oo_inode;
2173         struct ldiskfs_map_blocks map;
2174         unsigned int credits;
2175         ldiskfs_lblk_t blen;
2176         ldiskfs_lblk_t boff;
2177         loff_t new_size = 0;
2178         int depth = 0;
2179         int flags;
2180         int rc = 0;
2181
2182         ENTRY;
2183
2184         LASSERT(dt_object_exists(dt));
2185         LASSERT(osd_invariant(obj));
2186         LASSERT(inode != NULL);
2187
2188         CDEBUG(D_INODE, "fallocate: inode #%lu: start %llu end %llu mode %d\n",
2189                inode->i_ino, start, end, mode);
2190
2191         dquot_initialize(inode);
2192
2193         LASSERT(th);
2194
2195         boff = osd_i_blocks(inode, start);
2196         blen = osd_i_blocks(inode, ALIGN(end, 1 << inode->i_blkbits)) - boff;
2197
2198         /* Create and mark new extents as either zero or unwritten */
2199         flags = (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks ||
2200                  !ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS)) ?
2201                 LDISKFS_GET_BLOCKS_CREATE_ZERO :
2202                 LDISKFS_GET_BLOCKS_CREATE_UNWRIT_EXT;
2203 #ifdef LDISKFS_GET_BLOCKS_KEEP_SIZE
2204         if (mode & FALLOC_FL_KEEP_SIZE)
2205                 flags |= LDISKFS_GET_BLOCKS_KEEP_SIZE;
2206 #endif
2207         inode_lock(inode);
2208
2209         if (!(mode & FALLOC_FL_KEEP_SIZE) && (end > i_size_read(inode) ||
2210             end > LDISKFS_I(inode)->i_disksize)) {
2211                 new_size = end;
2212                 rc = inode_newsize_ok(inode, new_size);
2213                 if (rc)
2214                         GOTO(out, rc);
2215         }
2216
2217         inode_dio_wait(inode);
2218
2219         map.m_lblk = boff;
2220         map.m_len = blen;
2221
2222         /* Don't normalize the request if it can fit in one extent so
2223          * that it doesn't get unnecessarily split into multiple extents.
2224          */
2225         if (blen <= EXT_UNWRITTEN_MAX_LEN)
2226                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2227
2228         /*
2229          * credits to insert 1 extent into extent tree.
2230          */
2231         credits = ldiskfs_chunk_trans_blocks(inode, blen);
2232         depth = ext_depth(inode);
2233
2234         while (rc >= 0 && blen) {
2235                 loff_t epos;
2236
2237                 /*
2238                  * Recalculate credits when extent tree depth changes.
2239                  */
2240                 if (depth != ext_depth(inode)) {
2241                         credits = ldiskfs_chunk_trans_blocks(inode, blen);
2242                         depth = ext_depth(inode);
2243                 }
2244
2245                 /* TODO: quota check */
2246                 rc = osd_extend_restart_trans(handle, credits, inode);
2247                 if (rc)
2248                         break;
2249
2250                 rc = ldiskfs_map_blocks(handle, inode, &map, flags);
2251                 if (rc <= 0) {
2252                         CDEBUG(D_INODE,
2253                                "inode #%lu: block %u: len %u: ldiskfs_map_blocks returned %d\n",
2254                                inode->i_ino, map.m_lblk, map.m_len, rc);
2255                         ldiskfs_mark_inode_dirty(handle, inode);
2256                         break;
2257                 }
2258
2259                 map.m_lblk += rc;
2260                 map.m_len = blen = blen - rc;
2261                 epos = (loff_t)map.m_lblk << inode->i_blkbits;
2262                 inode_set_ctime_current(inode);
2263                 if (new_size) {
2264                         if (epos > end)
2265                                 epos = end;
2266                         if (ldiskfs_update_inode_size(inode, epos) & 0x1)
2267                                 inode_set_mtime_to_ts(inode,
2268                                                       inode_get_ctime(inode));
2269 #ifdef LDISKFS_EOFBLOCKS_FL
2270                 } else {
2271                         if (epos > inode->i_size)
2272                                 ldiskfs_set_inode_flag(inode,
2273                                                        LDISKFS_INODE_EOFBLOCKS);
2274 #endif
2275                 }
2276
2277                 ldiskfs_mark_inode_dirty(handle, inode);
2278         }
2279
2280 out:
2281         /* extand credits if needed for operations such as attribute set */
2282         if (rc >= 0)
2283                 rc = osd_extend_restart_trans(handle, save_credits, inode);
2284
2285         inode_unlock(inode);
2286
2287         RETURN(rc);
2288 }
2289
2290 static int osd_fallocate_punch(const struct lu_env *env, struct dt_object *dt,
2291                                __u64 start, __u64 end, int mode,
2292                                struct thandle *th)
2293 {
2294         struct osd_object *obj = osd_dt_obj(dt);
2295         struct inode *inode = obj->oo_inode;
2296         struct osd_access_lock *al;
2297         struct osd_thandle *oh;
2298         int rc = 0, found = 0;
2299
2300         ENTRY;
2301
2302         LASSERT(dt_object_exists(dt));
2303         LASSERT(osd_invariant(obj));
2304         LASSERT(inode != NULL);
2305
2306         dquot_initialize(inode);
2307
2308         LASSERT(th);
2309         oh = container_of(th, struct osd_thandle, ot_super);
2310         LASSERT(oh->ot_handle->h_transaction != NULL);
2311
2312         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2313                 if (obj != al->tl_obj)
2314                         continue;
2315                 LASSERT(al->tl_shared == 0);
2316                 found = 1;
2317                 /* do actual punch in osd_trans_stop() */
2318                 al->tl_start = start;
2319                 al->tl_end = end;
2320                 al->tl_mode = mode;
2321                 al->tl_punch = true;
2322                 break;
2323         }
2324
2325         RETURN(rc);
2326 }
2327
2328 static int osd_fallocate(const struct lu_env *env, struct dt_object *dt,
2329                          __u64 start, __u64 end, int mode, struct thandle *th)
2330 {
2331         int rc;
2332
2333         ENTRY;
2334
2335         if (mode & FALLOC_FL_PUNCH_HOLE) {
2336                 /* punch */
2337                 rc = osd_fallocate_punch(env, dt, start, end, mode, th);
2338         } else {
2339                 /* standard preallocate */
2340                 rc = osd_fallocate_preallocate(env, dt, start, end, mode, th);
2341         }
2342         RETURN(rc);
2343 }
2344
2345 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
2346                              __u64 start, __u64 end, struct thandle *th)
2347 {
2348         struct osd_thandle *oh;
2349         struct osd_object  *obj = osd_dt_obj(dt);
2350         struct inode       *inode;
2351         int                 rc;
2352         ENTRY;
2353
2354         LASSERT(th);
2355         oh = container_of(th, struct osd_thandle, ot_super);
2356
2357         /*
2358          * we don't need to reserve credits for whole truncate
2359          * it's not possible as truncate may need to free too many
2360          * blocks and that won't fit a single transaction. instead
2361          * we reserve credits to change i_size and put inode onto
2362          * orphan list. if needed truncate will extend or restart
2363          * transaction
2364          */
2365         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
2366                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
2367
2368         inode = obj->oo_inode;
2369         LASSERT(inode);
2370
2371         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2372                                    i_projid_read(inode), 0, oh, obj,
2373                                    NULL, OSD_QID_BLK);
2374
2375         /* if object holds encrypted content, we need to make sure we truncate
2376          * on an encryption unit boundary, or subsequent reads will get
2377          * corrupted content
2378          */
2379         if (rc == 0) {
2380                 if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2381                     start & ~LUSTRE_ENCRYPTION_MASK)
2382                         start = (start & LUSTRE_ENCRYPTION_MASK) +
2383                                 LUSTRE_ENCRYPTION_UNIT_SIZE;
2384                 ll_truncate_pagecache(inode, start);
2385                 rc = osd_trunc_lock(obj, oh, false);
2386         }
2387
2388         RETURN(rc);
2389 }
2390
2391 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
2392                      __u64 start, __u64 end, struct thandle *th)
2393 {
2394         struct osd_object *obj = osd_dt_obj(dt);
2395         struct osd_device *osd = osd_obj2dev(obj);
2396         struct inode *inode = obj->oo_inode;
2397         struct osd_access_lock *al;
2398         struct osd_thandle *oh;
2399         int rc = 0, found = 0;
2400         bool grow = false;
2401         ENTRY;
2402
2403         LASSERT(dt_object_exists(dt));
2404         LASSERT(osd_invariant(obj));
2405         LASSERT(inode != NULL);
2406         dquot_initialize(inode);
2407
2408         LASSERT(th);
2409         oh = container_of(th, struct osd_thandle, ot_super);
2410         LASSERT(oh->ot_handle->h_transaction != NULL);
2411
2412         /* we used to skip truncate to current size to
2413          * optimize truncates on OST. with DoM we can
2414          * get attr_set to set specific size (MDS_REINT)
2415          * and then get truncate RPC which essentially
2416          * would be skipped. this is bad.. so, disable
2417          * this optimization on MDS till the client stop
2418          * to sent MDS_REINT (LU-11033) -bzzz
2419          */
2420         if (osd->od_is_ost && i_size_read(inode) == start)
2421                 RETURN(0);
2422
2423         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
2424
2425         spin_lock(&inode->i_lock);
2426         if (i_size_read(inode) < start)
2427                 grow = true;
2428         i_size_write(inode, start);
2429         spin_unlock(&inode->i_lock);
2430
2431         /* optimize grow case */
2432         if (grow) {
2433                 osd_execute_truncate(obj);
2434                 GOTO(out, rc);
2435         }
2436
2437         inode_lock(inode);
2438         /* add to orphan list to ensure truncate completion
2439          * if this transaction succeed. ldiskfs_truncate()
2440          * will take the inode out of the list
2441          */
2442         rc = ldiskfs_orphan_add(oh->ot_handle, inode);
2443         inode_unlock(inode);
2444         if (rc != 0)
2445                 GOTO(out, rc);
2446
2447         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2448                 if (obj != al->tl_obj)
2449                         continue;
2450                 LASSERT(al->tl_shared == 0);
2451                 found = 1;
2452                 /* do actual truncate in osd_trans_stop() */
2453                 al->tl_truncate = 1;
2454                 break;
2455         }
2456         LASSERT(found);
2457
2458 out:
2459         RETURN(rc);
2460 }
2461
2462 static int fiemap_check_ranges(struct inode *inode,
2463                                u64 start, u64 len, u64 *new_len)
2464 {
2465         loff_t maxbytes;
2466
2467         *new_len = len;
2468
2469         if (len == 0)
2470                 return -EINVAL;
2471
2472         if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
2473                 maxbytes = inode->i_sb->s_maxbytes;
2474         else
2475                 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
2476
2477         if (start > maxbytes)
2478                 return -EFBIG;
2479
2480         /*
2481          * Shrink request scope to what the fs can actually handle.
2482          */
2483         if (len > maxbytes || (maxbytes - len) < start)
2484                 *new_len = maxbytes - start;
2485
2486         return 0;
2487 }
2488
2489 /* So that the fiemap access checks can't overflow on 32 bit machines. */
2490 #define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
2491
2492 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
2493                           struct fiemap *fm)
2494 {
2495         struct fiemap_extent_info fieinfo = {0, };
2496         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2497         u64 len;
2498         int rc;
2499         DECLARE_MM_SEGMENT_T(saved_fs);
2500
2501         LASSERT(inode);
2502         if (inode->i_op->fiemap == NULL)
2503                 return -EOPNOTSUPP;
2504
2505         if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
2506                 return -EINVAL;
2507
2508         rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
2509         if (rc)
2510                 return rc;
2511
2512         fieinfo.fi_flags = fm->fm_flags;
2513         fieinfo.fi_extents_max = fm->fm_extent_count;
2514         fieinfo.fi_extents_start = fm->fm_extents;
2515
2516         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
2517                 filemap_write_and_wait(inode->i_mapping);
2518
2519         access_set_kernel(saved_fs, &fieinfo);
2520         rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
2521         access_unset_kernel(saved_fs, &fieinfo);
2522         fm->fm_flags = fieinfo.fi_flags;
2523         fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
2524
2525         return rc;
2526 }
2527
2528 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
2529                        __u64 start, __u64 end, enum lu_ladvise_type advice)
2530 {
2531         struct osd_object *obj = osd_dt_obj(dt);
2532         int rc = 0;
2533         ENTRY;
2534
2535         switch (advice) {
2536         case LU_LADVISE_DONTNEED:
2537                 if (end)
2538                         invalidate_mapping_pages(obj->oo_inode->i_mapping,
2539                                                  start >> PAGE_SHIFT,
2540                                                  (end - 1) >> PAGE_SHIFT);
2541                 break;
2542         default:
2543                 rc = -ENOTSUPP;
2544                 break;
2545         }
2546
2547         RETURN(rc);
2548 }
2549
2550 static loff_t osd_lseek(const struct lu_env *env, struct dt_object *dt,
2551                         loff_t offset, int whence)
2552 {
2553         struct osd_object *obj = osd_dt_obj(dt);
2554         struct osd_device *dev = osd_obj2dev(obj);
2555         struct inode *inode = obj->oo_inode;
2556         struct file *file;
2557         loff_t result;
2558
2559         ENTRY;
2560         LASSERT(dt_object_exists(dt));
2561         LASSERT(osd_invariant(obj));
2562         LASSERT(inode);
2563         LASSERT(offset >= 0);
2564
2565         file = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
2566                                  inode->i_fop);
2567         if (IS_ERR(file))
2568                 RETURN(PTR_ERR(file));
2569
2570         file->f_mode |= FMODE_64BITHASH;
2571         result = file->f_op->llseek(file, offset, whence);
2572         ihold(inode);
2573         fput(file);
2574         /*
2575          * If 'offset' is beyond end of object file then treat it as not error
2576          * but valid case for SEEK_HOLE and return 'offset' as result.
2577          * LOV will decide if it is beyond real end of file or not.
2578          */
2579         if (whence == SEEK_HOLE && result == -ENXIO)
2580                 result = offset;
2581
2582         CDEBUG(D_INFO, "seek %s from %lld: %lld\n", whence == SEEK_HOLE ?
2583                        "hole" : "data", offset, result);
2584         RETURN(result);
2585 }
2586
2587 /*
2588  * in some cases we may need declare methods for objects being created
2589  * e.g., when we create symlink
2590  */
2591 const struct dt_body_operations osd_body_ops_new = {
2592         .dbo_declare_write = osd_declare_write,
2593 };
2594
2595 const struct dt_body_operations osd_body_ops = {
2596         .dbo_read                       = osd_read,
2597         .dbo_declare_write              = osd_declare_write,
2598         .dbo_write                      = osd_write,
2599         .dbo_bufs_get                   = osd_bufs_get,
2600         .dbo_bufs_put                   = osd_bufs_put,
2601         .dbo_write_prep                 = osd_write_prep,
2602         .dbo_declare_write_commit       = osd_declare_write_commit,
2603         .dbo_write_commit               = osd_write_commit,
2604         .dbo_read_prep                  = osd_read_prep,
2605         .dbo_declare_punch              = osd_declare_punch,
2606         .dbo_punch                      = osd_punch,
2607         .dbo_fiemap_get                 = osd_fiemap_get,
2608         .dbo_ladvise                    = osd_ladvise,
2609         .dbo_declare_fallocate          = osd_declare_fallocate,
2610         .dbo_fallocate                  = osd_fallocate,
2611         .dbo_lseek                      = osd_lseek,
2612 };
2613
2614 /**
2615  * Get a truncate lock
2616  *
2617  * In order to take multi-transaction truncate out of main transaction we let
2618  * the caller grab a lock on the object passed. the lock can be shared (for
2619  * writes) and exclusive (for truncate). It's not allowed to mix truncate
2620  * and write in the same transaction handle (do not confuse with big ldiskfs
2621  * transaction containing lots of handles).
2622  * The lock must be taken at declaration.
2623  *
2624  * \param obj           object to lock
2625  * \oh                  transaction
2626  * \shared              shared or exclusive
2627  *
2628  * \retval 0            lock is granted
2629  * \retval -NOMEM       no memory to allocate lock
2630  */
2631 int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared)
2632 {
2633         struct osd_access_lock *al, *tmp;
2634
2635         LASSERT(obj);
2636         LASSERT(oh);
2637
2638         list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) {
2639                 if (tmp->tl_obj != obj)
2640                         continue;
2641                 LASSERT(tmp->tl_shared == shared);
2642                 /* found same lock */
2643                 return 0;
2644         }
2645
2646         OBD_ALLOC_PTR(al);
2647         if (unlikely(al == NULL))
2648                 return -ENOMEM;
2649         al->tl_obj = obj;
2650         al->tl_truncate = false;
2651         if (shared)
2652                 down_read(&obj->oo_ext_idx_sem);
2653         else
2654                 down_write(&obj->oo_ext_idx_sem);
2655         al->tl_shared = shared;
2656         lu_object_get(&obj->oo_dt.do_lu);
2657
2658         list_add(&al->tl_list, &oh->ot_trunc_locks);
2659
2660         return 0;
2661 }
2662
2663 void osd_trunc_unlock_all(const struct lu_env *env, struct list_head *list)
2664 {
2665         struct osd_access_lock *al, *tmp;
2666
2667         list_for_each_entry_safe(al, tmp, list, tl_list) {
2668                 if (al->tl_shared)
2669                         up_read(&al->tl_obj->oo_ext_idx_sem);
2670                 else
2671                         up_write(&al->tl_obj->oo_ext_idx_sem);
2672                 osd_object_put(env, al->tl_obj);
2673                 list_del(&al->tl_list);
2674                 OBD_FREE_PTR(al);
2675         }
2676 }
2677
2678 /* For a partial-page punch, flush punch range to disk immediately */
2679 static void osd_partial_page_flush_punch(struct osd_device *d,
2680                                          struct inode *inode, loff_t start,
2681                                          loff_t end)
2682 {
2683         if (osd_use_page_cache(d)) {
2684                 filemap_fdatawrite_range(inode->i_mapping, start, end);
2685         } else {
2686                 /* Notice we use "wait" version to ensure I/O is complete */
2687                 filemap_write_and_wait_range(inode->i_mapping, start,
2688                                              end);
2689                 invalidate_mapping_pages(inode->i_mapping, start >> PAGE_SHIFT,
2690                                          end >> PAGE_SHIFT);
2691         }
2692 }
2693
2694 /*
2695  * For a partial-page truncate, flush the page to disk immediately to
2696  * avoid data corruption during direct disk write.  b=17397
2697  */
2698 static void osd_partial_page_flush(struct osd_device *d, struct inode *inode,
2699                                    loff_t offset)
2700 {
2701         if (!(offset & ~PAGE_MASK))
2702                 return;
2703
2704         if (osd_use_page_cache(d)) {
2705                 filemap_fdatawrite_range(inode->i_mapping, offset, offset + 1);
2706         } else {
2707                 /* Notice we use "wait" version to ensure I/O is complete */
2708                 filemap_write_and_wait_range(inode->i_mapping, offset,
2709                                              offset + 1);
2710                 invalidate_mapping_pages(inode->i_mapping, offset >> PAGE_SHIFT,
2711                                          offset >> PAGE_SHIFT);
2712         }
2713 }
2714
2715 void osd_execute_truncate(struct osd_object *obj)
2716 {
2717         struct osd_device *d = osd_obj2dev(obj);
2718         struct inode *inode = obj->oo_inode;
2719         __u64 size;
2720
2721         /* simulate crash before (in the middle) of delayed truncate */
2722         if (CFS_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) {
2723                 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2724                 struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb);
2725
2726                 mutex_lock(&sbi->s_orphan_lock);
2727                 list_del_init(&ei->i_orphan);
2728                 mutex_unlock(&sbi->s_orphan_lock);
2729                 return;
2730         }
2731
2732         size = i_size_read(inode);
2733         inode_lock(inode);
2734         /* if object holds encrypted content, we need to make sure we truncate
2735          * on an encryption unit boundary, or block content will get corrupted
2736          */
2737         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2738             size & ~LUSTRE_ENCRYPTION_MASK)
2739                 inode->i_size = (size & LUSTRE_ENCRYPTION_MASK) +
2740                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2741         ldiskfs_truncate(inode);
2742         inode_unlock(inode);
2743         if (inode->i_size != size) {
2744                 spin_lock(&inode->i_lock);
2745                 i_size_write(inode, size);
2746                 LDISKFS_I(inode)->i_disksize = size;
2747                 spin_unlock(&inode->i_lock);
2748                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2749         }
2750         osd_partial_page_flush(d, inode, size);
2751 }
2752
2753 static int osd_execute_punch(const struct lu_env *env, struct osd_object *obj,
2754                              loff_t start, loff_t end, int mode)
2755 {
2756         struct osd_device *d = osd_obj2dev(obj);
2757         struct inode *inode = obj->oo_inode;
2758         struct file *file;
2759         int rc;
2760
2761         file = alloc_file_pseudo(inode, d->od_mnt, "/", O_NOATIME,
2762                                  inode->i_fop);
2763         if (IS_ERR(file))
2764                 RETURN(PTR_ERR(file));
2765
2766         file->f_mode |= FMODE_64BITHASH;
2767         rc = file->f_op->fallocate(file, mode, start, end - start);
2768         ihold(inode);
2769         fput(file);
2770         if (rc == 0)
2771                 osd_partial_page_flush_punch(d, inode, start, end - 1);
2772         return rc;
2773 }
2774
2775 int osd_process_truncates(const struct lu_env *env, struct list_head *list)
2776 {
2777         struct osd_access_lock *al;
2778         int rc = 0;
2779
2780         LASSERT(!journal_current_handle());
2781
2782         list_for_each_entry(al, list, tl_list) {
2783                 if (al->tl_shared)
2784                         continue;
2785                 if (al->tl_truncate)
2786                         osd_execute_truncate(al->tl_obj);
2787                 else if (al->tl_punch)
2788                         rc = osd_execute_punch(env, al->tl_obj, al->tl_start,
2789                                                al->tl_end, al->tl_mode);
2790         }
2791
2792         return rc;
2793 }